JB/T 5000.10-1998 General technical conditions for assembly of heavy machinery
Some standard content:
ICS25.010
J40
JB
Machinery Industry Standard of the People's Republic of China
JB/T5000.10-1998
General Technical Conditions for Heavy Machinery|| tt||Assembly
The heavy mechanical general techniques and standardsAssembly
Released on 1998-09-30
National Machinery Industry Bureau
Released
1998-12 -01 Implementation
JB/T5000.10-1998
Previous
Preface
Appendix A, Appendix B, Appendix C, Appendix D and Appendix E of this standard are An appendix to the prompt. This standard was proposed and centralized by the Metallurgical Equipment Standardization Technical Committee of the Ministry of Machinery Industry. The initial organizations of this standard are Shanghai Heavy Machinery Factory, Taiyuan Mining Machinery Factory, and Xi'an Heavy Machinery Research Institute. The main drafters of this standard: Gu Weiguang, Hu Bin, and Wang Wei. 1Scope
Mechanical Industry Standards of the People's Republic of China
General Technical Conditions for Heavy Machinery
Assembly
The heavy mechanical general techniques and standardsAssembly
JB/T 5000.10 —1998
This standard specifies the general requirements for the assembly of heavy machinery products, assembly connection methods, general technical requirements for typical component assembly, final assembly and commissioning.
This standard applies to the assembly of heavy-duty machine quilt products. Unless there are special requirements for drawings and technical documents, they shall comply with the provisions of this standard. 2 Reference Standards
The provisions contained in the following standards are adopted in The provisions cited in this standard that constitute this standard are valid at the time of publication of this standard. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB 923988
JB/T 6996-93
JB/T 7929--- 95
JB/T 5000.3—1998
JB/T 5000.9-1998|| tt | Technical Conditions Welded Parts
General Technical Conditions for Heavy Machinery Cutting Parts General Technical Conditions for Heavy Machinery Piping
3.1 Parts and components entering assembly (including purchased parts and outsourced parts) must have Only with the certificate from the inspection department can assembly be carried out. 3.2 Parts must be cleaned and cleaned before assembly. There must be no burrs, flashes, scale, rust, chips, oil, colorants, dust, etc.
3.3 The main matching dimensions of parts and components should be dealt with before assembly. In particular, the interference fit dimensions and related accuracy must be rechecked. The fit dimensions trimmed by the fitter must be rechecked by the inspection department. 3.4 The machining process during the assembly process should comply with the relevant regulations of JB/T5000.9; the welding process should comply with the relevant regulations of JB/T5000.3.
3.5 Unless there are special requirements, the sharp corners and sharp edges of other parts must be blunted before assembly. 3.6 During the assembly process, parts are not allowed to be bumped, scratched or rusted. 3.7 Parts and components with wet paint must not be assembled. 3.8 Basic parts of machines such as machine bases and fuselages should be calibrated horizontally (or vertically) with accuracy during assembly; for machines with simple structures and low accuracy, the accuracy should not be less than 0.2/1000mm. ; For machines with complex structures and high precision, it should not be less than 0.1/1000mm. 3.9 Appropriate amount of lubricating oil (or grease) must be injected into each lubricating place of parts and components after assembly. Approved by the National Machinery Industry Bureau on September 30, 1998 and implemented on December 01, 1998
1
4 Assembly Connection method
4.1 Screw and bolt connection
JB/T5000.101998
4.1.1 When tightening screws, bolts and nuts, it is strictly prohibited to hit or use inappropriate screwdrivers and wrenches , the screw grooves, nuts, screws, and screw inspection heads must not be damaged after tightening.
4.1.2 For tight peripheral parts with specified tightening torque requirements, a torque wrench must be used and tightened according to the specified tightening torque. For fasteners whose tightening torque is not specified, please refer to Appendix A (prompt appendix) for the tightening torque. 4.1.3 When the same part is fastened with multiple screws (bolts), each screw (bolt) must be tightened crosswise, symmetrically, gradually and evenly, if there is a positioning pin. You should start with the screw (bolt) closest to the pin. 4.1.4 After screws, bolts and nuts are tightened, their supporting surfaces should fit closely with the fastened parts. 4.1.5 After the nut is tightened, the heads of the bolts and screws should expose 2 to 3 pitches of the nut end face. 4.1.6 After tightening the countersunk head screws, the countersunk head shall not be higher than the end face of the countersunk hole. 4.1.7 Strictly assemble the fasteners of the grade specified in the drawings and technical documents. It is not allowed to replace high-performance fasteners with low-performance fasteners.
4.2 Pin connection
4.2.1 When assembling round dimension pins, they should be color-checked with the holes. Their contact rate should not be less than 60% of the mating length, and should be evenly distributed. 4.2.2 The end face of the positioning pin should generally protrude from the surface of the part. After the tapered pin with screw tail is installed into the relevant part, its big end should sink into the hole. 4.2.3 After the cotter pin is installed into the relevant parts, its tail must be separated, and its expansion angle is 60*~90°. 4.3 Key connection
4.3.1 When assembling flat keys, they shall not be configured in a ladder shape. 4.3.2 The two sides of the key and the chain groove on the shaft should be in uniform contact, and there should be no gaps on their mating surfaces. After the hook key and mold key are assembled, their contact area should not be less than 70% of the working area, and the non-contact parts should not be concentrated in one section. The exposed part should be 10% to 15% of the slope. 4.3.3 When assembling splines, The number of teeth in contact at the same time shall not be less than 2/3. The contact rate shall not be less than 50% between the length and height of the key teeth. 4.3.4 After the sliding-fit flat key (or spline) is assembled, the corresponding accessories must move freely and there must be no uneven tightness. 4.4 Rivet connection
4.4.1 When joining, the surface of the parts to be joined shall not be damaged, nor shall the parts to be riveted be deformed. 4.4.2 Except for special requirements, general loosening shall not occur after riveting. The head of the nail must be in close contact with the riveted part and should be smooth and round.
4.5 Adhesive connection
4.5.1 The adhesive grade must meet the design or process requirements, and the adhesive must be used within the validity period. 4.5.2 The surface to be bonded must be pre-treated to thoroughly remove oil, water film, rust and other impurities. 4.5.3 The adhesive should be applied evenly during bonding. The curing density, pressure, time, etc. must be strictly in accordance with the requirements of the process or the use period of the adhesive.
4.5.4 The excess adhesive flowing out should be removed after bonding, 4.6 Interference connection
4.6.1 Press installation
4.6.1.1
During press installation For the calculation of the press-in force, please refer to Appendix C (the appendix of the reminder). The press-fit shaft or sleeve is allowed to have a lead-in end, with a guide cone angle of 10*~20°, and the guide cone length is equal to or less than 15% of the mating length. 4.6.1.2
4.6.1.3 When the solid shaft is pressed into the blind hole, the exhaust trace is allowed to be opened, and the groove depth shall not be greater than 0.5mm. Unless there are special requirements, the surface of medical parts must be coated with clean lubricant when press-fitting. 4.6.1.4
When using a press for installation, the pressure of the press is generally 3 to 3.5 times the required pressing force. During the pressing process, the pressure change should be 4.6.1.5
smoothly.
4.6.2 Hot loading
2
JB/T5000.10—1998
4.6.2.1 For the heating method of hot loading, please refer to Appendix B (Appendix of Tips) Select. 4.6.2.2 The heating temperature of hot-fitted parts is determined based on the part material, bonding diameter, interference amount and the minimum gap of hot-fitted parts. The determination method is shown in Appendix D (Appendix of Tips).
4.6.2.3 The heating temperature of oil-heated parts is 20 to 30°C lower than the flash point of the oil used. 4.6.2.4 After hot assembly, the parts should be cooled naturally and rapid cooling is not allowed. 4.6.2.5 After hot assembly, the parts must be placed against the shaft shoulder or other relevant positioning surfaces, and the gap after cold shrinkage shall not be greater than 0.3/1000mm of the mating length.
4.6.3 Cold installation
4.6.3.1 The cooling methods commonly used in cold installation can be selected by referring to Appendix B. 4.6.3.2 For the method of determining the cooling temperature and time of parts during cold assembly, please refer to Appendix E (Appendix for Tips). 4.6.3.3. The refrigeration parts should be put into the containing parts immediately after being taken out. Parts with thick boxes on the surface must not be assembled and should be cooled again. 4.6.4 Expansion
4.6.4.1 The surface of the connecting parts on the surface of the expansion sleeve must be clean, free of dirt, corrosion, and damage. Before installation, evenly apply a layer of lubricating oil that does not contain MoS and other additives.
4.6.4.2 The expansion sleeve bolts must be tightened symmetrically, crosswise, and evenly using a torque wrench. 4.6.4.3 The tightening torque T value of bolts shall be specified in the design drawing or process. You may also refer to Appendix A, and follow the following steps: a) Tighten with T/3 value:
b) Tighten with T/2 value :
c) Tighten with T value:
d) Check all bolts with T value.
5 Typical component assembly
5.1 Rolling bearing assembly
5.1.1 The outer ring of the bearing and the semicircular hole of the open bearing seat and bearing cover are not allowed to be stuck, and renovation is allowed during assembly. For semicircular holes, the trimming dimensions should not exceed the values ??specified in Table 1.
Table 1 Trimming dimensions of the bearing cover (seat)
Bearing outer diameter D
≤120
>120~260
>260~400| |tt||>400
6
≤0.10
$0.15
0.20
≤0.25
mm
10 | |tt | When , it should be in uniform contact with the bearing seat within a range of 120° symmetry with the center line, and with the bearing cap within a range of 90* symmetry with the center line. When checking with a feeler gauge within the above range, the 0.03mm feeler gauge must not be inserted into 1/3 of the width of the outer ring.
5.1.3 The inner circular end face of the bearing should be close to the axial positioning surface. The allowable large clearance is 0.05mm for tapered roller bearings and angular contact ball bearings: 0.1mm for other bearings.
5.1.4 After assembly, the outer ring of the bearing should be in even contact with the end face of the bearing cap at the positioning end. 5.i.3 For bearings using grease, clean grease equivalent to approximately 50% of the bearing cavity volume should be injected after assembly. No grease is allowed for bearings lubricated by rare 3
oil. JB/T5090.10—1998
5.1.6 When the bearing is hot installed, its heating temperature should not be higher than 120°C. When the bearing is cold installed, its cooling temperature should not be lower than -80°C. 5.1.7 When assembling the detachable bearing, it must be strictly in accordance with the original assembly position, and must not be installed upside down or mixed with other bearings. For bearings with adjustable heads, the marked end of the bearing should face outward during assembly. 5.1.8 When radial bearings with non-adjustable radial clearance are installed at both ends of the shaft, and the axial displacement is limited by end caps at both ends, an axial clearance C must be left at one end (as shown in Figure 1). The value of C is calculated according to formula (1), Figure 1
C = a AL + 0. 15
(mm)
where: a-
t
L
Linear expansion coefficient of shaft material, for steel: a=12×10*/C: -The difference between the maximum working temperature of the shaft and the ambient temperature, C: The center distance between one and two bearings, mm;
0.15—The remaining interstitial gland after thermal expansion of the shaft, mm. In general, △=40C is used, so during assembly, the C value can be calculated using the simple formula (2) only based on the L size. C=0.0005L+0.15(mm)
(1)
+(2)
5.1.9 Single row tapered roller bearing, angular contact ball bearing, two-way thrust ball bearing shaft Adjust to Youyuan according to Table 2. When assembling double-row and four-row tapered roller bearings, the axial runout should be checked and should comply with the requirements of Tables 3 and 4. Table 2 Angular contact ball bearings, single row tapered roller bearings, double thrust ball bearings axial clearance angular contact ball bearings axial clearance
in-bearing
sugar
diameter
30
>30~50
>50~80
>80~120
>120~150
>150~ 180
>180~200
>206~250
4
Light series
0. 02 ~0. 06
0 . 03~0. 09
0. 04~0. 10
0.05~0.12
0. 06 ~ 0. 15
0. 07~0. 18
0. 09~0. 20
Medium and heavy series
0. 03~0. 09
0.04~0.10
0. 05~ 0, 12
0.06~0.15
0.07~0.18
0.08~0.20
0.10~0.22
Single row medical roller bearing axial clearance
Light series
0. 03~0. 10
0.04~0.11
0. 05 ~0. 13
0.05~0.15||tt ||0. 07~0.18
0.09~0.20
0.12~0.22
0.18~0.30
Light wide, medium and
Medium wide series| |tt||0. 04~0.11
0. 05~0.13
0. 06~0.15
0.07~0.18
0.08~0.20
0.10~0.22
0. 14~0. 24
0.18~0.30
mm
Two-way thrust ball bearing bearing travel
grid|| tt||Column
Series
0.03~0.08
0.04~0.10
0.05~0.12
0.06~0.15
Medium and heavy Series
0. 05~0.11
0.06~0.12
0. 07~0.14
0.10~0.18
Bearing inner diameter
5.80
>80~180
>180~225
>225~315
>315~580
Bearing inner diameter
>120 ~180
>180~315
>315~400
>400~500
JB/T5000.101998
Table 3 Double row conical roller Axial clearance of sub-bearings
General conditions
0.10~0.20
0.15~0.25
0.20~0.30
0. 30~0. 40
0.40~0.50
Toward
Table 4 Axial clearance of four-row tapered roller bearings Axial play limit
0.15~0.25||tt| |0.20~0.30
0.25~0. 35
0.30~0. 40
5.1.10 After the rolling bearing is installed, it should be flexibly and smoothly rotated by hand. 5.2 Sliding bearing assemblybZxz.net
5.2. 1
The upper and lower tiles should be assembled according to the matching marks during processing. The inner temperature of the swimming
mm
is 25~ higher than the outer temperature 30℃
0. 30~0. 40
0. 40~ 0. 50
0. 50~0. 60
0.70~0.80||tt| |0.90~1.00
mm
Rail bearing inner diameter
>500~630
>630~800
>800~1000
>1000~1250
5.2.2 The joint surfaces of the upper and lower bearing bushes must be tightly aligned and checked with a 0.05mm feeler gauge. Pump to swim
0.30~0.40
0. 35~0. 45
0. 35~0. 45
0.40~0.50
The bearing pad should be flat and free of thorns, and its shape should be the same as the pad opening. Its width and length should be 1~2mm smaller than the corresponding dimensions of the pad opening surface. 5.2.3
There must be a gap of 1~2mm between the pad and the journal, and the thickness on both sides should be consistent, and the tolerance should be less than 0.2mm. 5.2.4 When fixing the bearing with a locating pin, it should be drilled and matched with the pin while ensuring that the pad opening and end face are flush with the opening and closing surface and end face of the relevant bearing hole. The pin should not be loose after being driven in. The pin end face should be 1~2mm lower than the inner hole of the bearing. 5.2. 5
The outer surface of the upper and lower bearings should have good contact with the relevant bearing seat hole, and the contact rate within the allowable contact angle should meet the requirements of Table 5. Table 5 Contact requirements for the outer surface of the upper and lower bearings and the relevant bearing seat holes Contact requirements
Item
Contact angle.
mesh
Upper bearing
Oil lubrication
Grease lubrication
e angle internal contact rate
Wear side clearance 6
mm
130°±5*
120°±5*
60%
Lower bearing
150*±5°
140°±5*
70%
When D≤200mm, it is not difficult to insert a 65mm feeler gauge. When D>200mm, a 0.10mm feeler gauge is not allowed to be inserted.
5.2.6 The parts other than the inner hole of the upper and lower bearing bearings that contact the relevant journals 4 must be machined out of the oil mold (C, shown in Table 6). The wedge shape gradually transitions from the maximum to zero starting from the bearing mouth. The maximum value of the Australian shape is specified in Table 6. 5
Oil
Thin oil lubrication
Grease lubrication
Maximum value of type C
Cc
JB/T5000.10—1998
Table 6 Upper and lower bearing oil size
10~15mm range from both ends of the bearing
C,c
Middle part
C,2C
To; C value is the maximum matching limit of the shaft,
5.2.7
Upper (lower) bearing
After scraping, the inner hole of the bearing should have good contact with the relevant journal. The contact spots within the contact angle range shall be in accordance with the provisions of Table 7. Table 7 Contact requirements for the inner hole of the upper and lower bearings and the relevant journals.
Oil lubrication
120°
Grease lubrication
90*
. Number of contact spots within the angular range/25mm×25mmInner diameter of bearing shell
Shaft speed
≤130
>300~500
>500~1000
>1000
≤180
5
6
mm
>180~360
3
5
2
5.2.8 The assembly of the integral sleeve can be press-fitted or cold-fitted according to the size of the interference. 5.2.9 After the sleeve is installed in the machine, the inner diameter of the sleeve and the shaft should meet the design requirements. If necessary, it can be properly scraped to ensure it. The two joint surfaces are colored and ground. The contact traces should be evenly distributed, and the non-contact part should not exceed the block value specified in Table 8 within the specified area. Table 8 Evenly contact limit value
Length parameter range
260
>200~400
>400~860
Limited block value
25×25
40×40
60× 60
Length parameter range refers to the length of the rectangular plane. Length parameter circumference
>800~1600
>160
The length of the unfolded figure
Limited block value
80×80
100×100
mm
If the width of the combined surface is too small or equal to the limited block value in the selected grade, the corresponding grade can be reduced (the width of the combined surface> is greater than the limited block value side length grade,
6
JB/T5000.10-1998
5.2.10 The bearing body and spherical seat of the spherical bearing should be in uniform contact. The contact rate should not be less than 70% when checked by the color coating method. 5.2.11 The contact requirements of the scraping and grinding of the alloy bearing lining should be Seek the same as 5.2.7. The scraping amount shall not exceed 1/30 of the thickness of the alloy bearing liner. 5.2.12 The alloy bearing liner shall not be used when the surface is yellow. There shall be no core separation phenomenon within the specified contact angle. The core separation area outside the contact angle shall not be greater than 10% of the total area of ??the non-contact area. 5.3 Assembly of gears and gearboxes
5.3.1 The reference end face of the gear (worm wheel) and the shaft shoulder (or the end face of the positioning sleeve) shall fit together. Use a 0.05mm feeler gauge to check that it does not penetrate. And the verticality requirements of the reference end face of the gear and the axis shall be guaranteed. 5.3.2 The axial misalignment of the meshing cylindrical gear pair shall comply with the following provisions: a) When the tooth width B≤100mm, the misalignment AB≤0.05B; b) When the tooth width B>100mm, the misalignment AB≤5mm. 5.3.3 The tooth surface contact spot of the gear (worm wheel) pair when it is engaged shall not be less than the provisions of Table 9. The distribution position of the contact spots should be close to the middle of the tooth surface, and no contact is allowed between the tooth top and the tooth end. Table 9
Contact spots on tooth surface
Cylindrical gear
Accuracy grade
5
6
?
8
9
10
11
5.3.4
5.3.5
Along the tooth quotient
55
50
45
40
30
25
20
Along the tooth length
80
70||t t||60
50
40
30
30
Drawing dimension
Gear
Along the height
65~85
55~75
40~70
30~60
%
Along the tooth length
6080
50~70
30~65
25~55
After the gear (worm gear) pair is assembled, the tooth side clearance should be checked and it should meet the drawing or process requirements. Bevel gears should be assembled according to the processing matching number. Worm
Lo tooth height
65
55
45
30
Wheel
Along tooth length
60
50
40
30
The joint surface between the gearbox and the cover should be in good contact. In the free state, the gap between the cover and the box body should not exceed the specified value in Table 10: 5.3.6
After tightening, check with a 0.05mm feeler gauge, and the partial insertion should not exceed one third of the joint surface width. Table 10 Allowable clearance between cover and case in free state Gearbox length
Clearance between case and cover
≤1000
≤0. 08
>1000~2000
≤0.12
>2000~3000
≤0.15
mm
>3000~4000
≤0. 20
5.3.7 After the gear transmission device is assembled, it shall be tested for idling according to the design or process requirements. And it shall run smoothly without abnormal noise. 5.3.8 The cleanliness of the gearbox shall comply with the provisions of JB/T7929. 5.4 Assembly of pulley and chain drive
5.4.1 For pulleys with drive shafts, the tolerance of parallelism of the two axes is (0.15/1000)L (L--the center distance between the two axes), and the middle planes of the wheel widths of the two wheels should be on the same plane, with a tolerance of 0.5mm. 5.4.2 The geometric center lines of the teeth of the driving sprocket and the driven sprocket should coincide, and the offset error should not exceed 0.015L (L--the center distance between the two sprockets).
5.4.3 When the chain is meshing with the sprocket, the working side of the chain must be tightened and the meshing should be smooth. 5.4.4 The initial sag of the non-working side of the chain should be adjusted according to 1% to 5% of the center distance between the two sprockets. 5.5 Assembly of coupling
7
Drill and distribute pins while ensuring that the opening and end face of the tile are flush with the opening and closing faces and end faces of the relevant bearing holes. The pin must not be loose after being driven in. The end surface of the pin should be 1~2mm lower than the inner hole of the bearing bush. 5.2. 5
The outer parts of the upper and lower bearing bushes should be in good contact with the relevant bearing seat holes, and the contact rate within the allowable contact angle should be Meet the requirements of Table 5. Table 5. Contact requirements between the upper and lower bearing outer shells and the relevant bearing seat holes. Contact requirements
item
contact angle.
Mesh
upper tile
thin oil lubrication
grease lubrication
e angle inner contact rate
tile side clearance 6||tt ||mm
130°±5*
120°±5*
60%
Lower tile
150*±5°||tt ||140°±5*
70%
When D≤200mm, n.65mm feeler gauge is not difficult to insert. When D>200mm, 0.10mm feeler gauge is not allowed to be inserted
5.2.6 The parts other than the inner hole of the upper and lower bearing shells that are in contact with the relevant journal 4 need to be machined out of the oil mold (C, shown in the figure in Table 6). The wedge shape gradually transitions from the maximum to zero starting from the tile mouth. The maximum value of the Australian shape is connected. Table 6 specifies. 5
Oil
Thin oil lubrication
Grease slipper
Class maximum value C
Cc
JB/T5000.10—1998
Table 6 Upper and Lower Bearing Oil Dimensions
Within the range of 10~15mm from both ends of the bearing
C,c
Middle part
C, 2C
Go; C value is the maximum fit limit of the shaft,
5.2.7
Upper (lower) bush
The relevant journals are in good contact. The contact spots within the contact angle range are specified in Table 7. Table 7. The contact requirements between the inner holes of the upper and lower bearing bushes and the relevant journals.
Thin oil lubrication
120°
Grease lubrication
90*
. Number of contact spots within the angular range/25mm×25mm bearing inner diameter
Shaft speed
≤130
>300~500
>500~1000
> 1000
≤180
5
6
mm
>180~360|>360~500
3||tt| |5
2
5.2.8 The assembly of the integral shaft sleeve can be press-fitted or cold-fitted according to the size of the interference. 5.2.9 After the shaft sleeve is inserted into the machine part, the inner diameter of the shaft sleeve and the shaft should meet the design requirements. If necessary, it can be repaired and scraped appropriately to ensure it. The joint surfaces of the two pieces have been colored and combined, and the contact traces should be evenly distributed. The uncontacted parts of the two pieces should not exceed the square value specified in Table 8 within the limited area. Table 8 Uniform contact limit value
Length parameter range
260
>200~400
>400~860
Limited square value||tt ||25×25
40×40
60× 60
The length parameter range refers to the length of the rectangular plane. The length parameter flower width
>800~1600|| tt||>160
The length of the expanded graphic
limited block value
80×80
100×100
mm||tt| |If you want to combine the width of the surface with a small hand or if it is equal to the limited square value in the selected grade, you can downgrade to the corresponding grade (combined with the width of the surface > greater than the limited 2
grade with fixed square value side length,
6
JB/T5000.10-1998
5.2.10 The bearing body of the spherical bearing and the spherical seat should be in uniform contact. Check with the coloring method. The contact rate should not be less than 70%. 5.2.11 The scraping contact requirements for alloy bearing linings are the same as 5.2.7. The scraping amount shall not be greater than 1/30 of the wall thickness of alloy bearing linings. 5.2.12 The alloy bearing linings are not allowed to be used when the surface is yellow. No nucleation is allowed within the contact angle, and the nucleation area outside the contact angle shall not exceed 10% of the total area of ??the non-contact area. 5.3 Gear and gearbox assembly
5.3.1 Gear (worm gear) reference end surface and The shaft shoulder (or positioning sleeve end face) should be fit and checked with a 0.05mm feeler gauge, and the verticality requirements of the gear reference end face and the axis should be ensured. 5.3.2 The axial misalignment of the meshing cylindrical gear pair should comply with the following. Regulations: a) When the tooth width B ≤ 100mm, the misalignment AB ≤ 0.05B; b) When the tooth width B > 100mm, the misalignment AB ≤ 5mm, 5.3.3 The tooth surface contact spots when the gear (worm gear) pair are aligned are not Less than the requirements of Table 9. The distribution position of the contact points should be close to the middle of the tooth surface, and no contact between the tooth tip and the tooth end is allowed. Table 9
Tooth surface contact spots
Cylinder gear
Accuracy level
5
6
?
8| |tt||9
10
11
5.3.4
5.3.5
along tooth quotient
55||tt ||50
45
40
30
25
20
along the tooth length
80||tt ||70
60
50
40
30
30
drawing dimension
gear||tt| |High along the tooth
65~85
55~75
40~70
30~60
%
Along the tooth length
6080
50~70
30~65
25~55
After the gear (worm gear) assembly, the tooth side clearance should be checked and comply with Drawing or process requirements. Bevel gears should be assembled according to the processing matching number. Cochlear
Lotus tooth height
65
55
45
30
wheel
along the tooth length||tt ||60
50
40
30
The joint surface of the gear box and cover should be in good contact. In the free state, the gap between the box cover and the box body should not exceed the specified value in Table 10: 5.3.6 | one part. Table 10 Allowable clearance between box cover and box body in free condition Gear box length
Gap between box body and adhesive cover
≤1000
≤0. 08
> 1000~2000
≤0.12
>2000~3000
≤0.15
mm
>3000~4000
≤0. 20
5.3.7 After the gear transmission is assembled, an empty running test shall be carried out according to the design or process requirements. And it should run smoothly and without abnormal noise. 5.3.8 The cleanliness of the gearbox should comply with the requirements of JB/T7929. 5.4 Pulley and chain drive assembly
5.4.1 For the pulley of the horizontal transmission shaft, the parallelism tolerance of the two axes is (0.15/1000) L (L - the center distance between the two axes). The wide middle plane should be on the same plane, with a tolerance of 0.5mm. 5.4.2 The geometric center lines of the gear teeth of the driving sprocket and the driven sprocket should coincide, and their offset error should not be greater than 0.015L (L - the center distance between the two sprockets).
5.4.3 When the chain meshes with the sprocket, the working side of the chain must be tightened and the meshing should be guaranteed to be smooth. 5.4.4 The initial sag of the non-working side of the chain is adjusted according to 1% to 5% of the center distance between the two sprockets. 5.5 Coupling assembly
7
Drill and distribute pins while ensuring that the opening and end face of the tile are flush with the opening and closing faces and end faces of the relevant bearing holes. The pin must not be loose after being driven in. The end surface of the pin should be 1~2mm lower than the inner hole of the bearing bush. 5.2. 5
The outer parts of the upper and lower bearing bushes should be in good contact with the relevant bearing seat holes, and the contact rate within the allowable contact angle should be Meet the requirements of Table 5. Table 5. Contact requirements between the upper and lower bearing outer shells and the relevant bearing seat holes. Contact requirements
item
contact angle.
Mesh
upper tile
thin oil lubrication
grease lubrication
e angle inner contact rate
tile side clearance 6||tt ||mm
130°±5*
120°±5*
60%
Lower tile
150*±5°||tt ||140°±5*
70%
When D≤200mm, n.65mm feeler gauge is not difficult to insert. When D>200mm, 0.10mm feeler gauge is not allowed to be inserted
5.2.6 The parts other than the inner hole of the upper and lower bearing shells that are in contact with the relevant journal 4 need to be machined out of the oil mold (C, shown in the figure in Table 6). The wedge shape gradually transitions from the maximum to zero starting from the tile mouth. The maximum value of the Australian shape is connected. Table 6 specifies. 5
Oil
Thin oil lubrication
Grease slipper
Class maximum value C
Cc
JB/T5000.10—1998
Table 6 Upper and Lower Bearing Oil Dimensions
Within the range of 10~15mm from both ends of the bearing
C,c
Middle part
C, 2C
Go; C value is the maximum fit limit of the shaft,
5.2.7
Upper (lower) bush
The relevant journals are in good contact. The contact spots within the contact angle range are specified in Table 7. Table 7. The contact requirements between the inner holes of the upper and lower bearing bushes and the relevant journals.
Thin oil lubrication
120°
Grease lubrication
90*
. Number of contact spots within the angular range/25mm×25mm bearing inner diameter
Shaft speed
≤130
>300~500
>500~1000
> 1000
≤180
5
6
mm
>180~360|>360~500
3||tt| |5
2
5.2.8 The assembly of the integral shaft sleeve can be press-fitted or cold-fitted according to the size of the interference. 5.2.9 After the shaft sleeve is inserted into the machine part, the inner diameter of the shaft sleeve and the shaft should meet the design requirements. If necessary, it can be repaired and scraped appropriately to ensure it. The joint surfaces of the two pieces have been colored and combined, and the contact traces should be evenly distributed. The uncontacted parts of the two pieces should not exceed the square value specified in Table 8 within the limited area. Table 8 Uniform contact limit value
Length parameter range
260
>200~400
>400~860
Limited square value||tt ||25×25
40×40
60× 60
The length parameter range refers to the length of the rectangular plane. The length parameter flower width
>800~1600|| tt||>160
The length of the expanded graphic
limited block value
80×80
100×100
mm||tt| |If you want to combine the width of the surface with a small hand or if it is equal to the limited square value in the selected grade, you can downgrade to the corresponding grade (combined with the width of the surface > greater than the limited 2
grade with fixed square value side length,
6
JB/T5000.10-1998
5.2.10 The bearing body of the spherical bearing and the spherical seat should be in uniform contact. Check with the coloring method. The contact rate should not be less than 70%. 5.2.11 The scraping contact requirements for alloy bearing linings are the same as 5.2.7. The scraping amount shall not be greater than 1/30 of the wall thickness of alloy bearing linings. 5.2.12 The alloy bearing linings are not allowed to be used when the surface is yellow. No nucleation is allowed within the contact angle, and the nucleation area outside the contact angle shall not exceed 10% of the total area of ??the non-contact area. 5.3 Gear and gearbox assembly
5.3.1 Gear (worm gear) reference end surface and The shaft shoulder (or positioning sleeve end face) should be fit and checked with a 0.05mm feeler gauge, and the verticality requirements of the gear reference end face and the axis should be ensured. 5.3.2 The axial misalignment of the meshing cylindrical gear pair should comply with the following. Regulations: a) When the tooth width B ≤ 100mm, the misalignment AB ≤ 0.05B; b) When the tooth width B > 100mm, the misalignment AB ≤ 5mm, 5.3.3 The tooth surface contact spots when the gear (worm gear) pair are aligned are not Less than the requirements of Table 9. The distribution position of the contact points should be close to the middle of the tooth surface, and no contact between the tooth tip and the tooth end is allowed. Table 9
Tooth surface contact spots
Cylinder gear
Accuracy level
5
6
?
8| |tt||9
10
11
5.3.4
5.3.5
along tooth quotient
55||tt ||50
45
40
30
25
20
along the tooth length
80||tt ||70
60
50
40
30
30
drawing dimension
gear||tt| |High along the tooth
65~85
55~75
40~70
30~60
%
Along the tooth length
6080
50~70
30~65
25~55
After the gear (worm gear) assembly, the tooth side clearance should be checked and comply with Drawing or process requirements. Bevel gears should be assembled according to the processing matching number. Cochlear
Lotus tooth height
65
55
45
30
wheel
along the tooth length||tt ||60
50
40
30
The joint surface of the gear box and cover should be in good contact. In the free state, the gap between the box cover and the box body should not exceed the specified value in Table 10: 5.3.6 | one part. Table 10 Allowable clearance between box cover and box body in free condition Gear box length
Gap between box body and adhesive cover
≤1000
≤0. 08
> 1000~2000
≤0.12
>2000~3000
≤0.15
mm
>3000~4000
≤0. 20
5.3.7 After the gear transmission is assembled, an empty running test shall be carried out according to the design or process requirements. And it should run smoothly and without abnormal noise. 5.3.8 The cleanliness of the gearbox should comply with the requirements of JB/T7929. 5.4 Pulley and chain drive assembly
5.4.1 For the pulley of the horizontal transmission shaft, the parallelism tolerance of the two axes is (0.15/1000) L (L - the center distance between the two axes). The wide middle plane should be on the same plane, with a tolerance of 0.5mm. 5.4.2 The geometric center lines of the gear teeth of the driving sprocket and the driven sprocket should coincide, and their offset error should not be greater than 0.015L (L - the center distance between the two sprockets).
5.4.3 When the chain meshes with the sprocket, the working side of the chain must be tightened and the meshing should be guaranteed to be smooth. 5.4.4 The initial sag of the non-working side of the chain is adjusted according to 1% to 5% of the center distance between the two sprockets. 5.5 Coupling assembly
7
5
The outer surface of the upper and lower bearing shells should be in good contact with the relevant bearing seat holes, and the contact rate within the allowable contact angle should meet the requirements of Table 5. Table 5 Contact requirements for the outer surface of the upper and lower bearing shells and the relevant bearing seat holes Contact requirements
Item
Contact angle.
mesh
Upper bearing
Oil lubrication
Grease lubrication
e angle internal contact rate
Wear side clearance 6
mm
130°±5*
120°±5*
60%
Lower bearing
150*±5°
140°±5*
70%
When D≤200mm, it is not difficult to insert a 65mm feeler gauge. When D>200mm, a 0.10mm feeler gauge is not allowed to be inserted.
5.2.6 The parts other than the inner hole of the upper and lower bearing bearings that contact the relevant journals 4 must be machined out of the oil mold (C, shown in Table 6). The wedge shape gradually transitions from the maximum to zero starting from the bearing mouth. The maximum value of the Australian shape is specified in Table 6. 5
Oil
Thin oil lubrication
Grease lubrication
Maximum value of type C
Cc
JB/T5000.10—1998
Table 6 Upper and lower bearing oil size
10~15mm range from both ends of the bearing
C,c
Middle part
C,2C
To; C value is the maximum matching limit of the shaft,
5.2.7
Upper (lower) bearing
After scraping, the inner hole of the bearing should have good contact with the relevant journal. The contact spots within the contact angle range shall be in accordance with the provisions of Table 7. Table 7 Contact requirements for the inner hole of the upper and lower bearings and the relevant journals.
Oil lubrication
120°
Grease lubrication
90*
. Number of contact spots within the angular range/25mm×25mmInner diameter of bearing shell
Shaft speed
≤130
>300~500
>500~1000
>1000
≤180
5
6
mm
>180~360
3
5
2
5.2.8 The assembly of the integral sleeve can be press-fitted or cold-fitted according to the size of the interference. 5.2.9 After the sleeve is installed in the machine, the inner diameter of the sleeve and the shaft should meet the design requirements. If necessary, it can be properly scraped to ensure it. The two joint surfaces are colored and ground. The contact traces should be evenly distributed, and the non-contact part should not exceed the block value specified in Table 8 within the specified area. Table 8 Evenly contact limit value
Length parameter range
260
>200~400
>400~860
Limited block value
25×25
40×40
60× 60
Length parameter range refers to the length of the rectangular plane. Length parameter circumference
>800~1600
>160
The length of the unfolded figure
Limited block value
80×80
100×100
mm
If the width of the combined surface is too small or equal to the limited block value in the selected grade, the corresponding grade can be reduced (the width of the combined surface> is greater than the limited block value side length grade,
6
JB/T5000.10-1998
5.2.10 The bearing body and spherical seat of the spherical bearing should be in uniform contact. The contact rate should not be less than 70% when checked by the color coating method. 5.2.11 The contact requirements of the scraping and grinding of the alloy bearing lining should be Seek the same as 5.2.7. The scraping amount shall not exceed 1/30 of the thickness of the alloy bearing liner. 5.2.12 The alloy bearing liner shall not be used when the surface is yellow. There shall be no core separation phenomenon within the specified contact angle. The core separation area outside the contact angle shall not be greater than 10% of the total area of ??the non-contact area. 5.3 Assembly of gears and gearboxes
5.3.1 The reference end face of the gear (worm wheel) and the shaft shoulder (or the end face of the positioning sleeve) shall fit together. Use a 0.05mm feeler gauge to check that it does not penetrate. And the verticality requirements of the reference end face of the gear and the axis shall be guaranteed. 5.3.2 The axial misalignment of the meshing cylindrical gear pair shall comply with the following provisions: a) When the tooth width B≤100mm, the misalignment AB≤0.05B; b) When the tooth width B>100mm, the misalignment AB≤5mm. 5.3.3 The tooth surface contact spot of the gear (worm wheel) pair when it is engaged shall not be less than the provisions of Table 9. The distribution position of the contact spots should be close to the middle of the tooth surface, and no contact is allowed between the tooth top and the tooth end. Table 9
Contact spots on tooth surface
Cylindrical gear
Accuracy grade
5
6
?
8
9
10
11
5.3.4
5.3.5
Along the tooth quotient
55
50
45
40
30
25
20
Along the tooth length
80
70||t t||60
50
40
30
30
Drawing dimension
Gear
Along the height
65~85
55~75
40~70
30~60
%
Along the tooth length
6080
50~70
30~65
25~55
After the gear (worm gear) pair is assembled, the tooth side clearance should be checked and it should meet the drawing or process requirements. Bevel gears should be assembled according to the processing matching number. Worm
Lo tooth height
65
55
45
30
Wheel
Along tooth length
60
50
40
30
The joint surface between the gearbox and the cover should be in good contact. In the free state, the gap between the cover and the box body should not exceed the specified value in Table 10: 5.3.6
After tightening, check with a 0.05mm feeler gauge, and the partial insertion should not exceed one third of the joint surface width. Table 10 Allowable clearance between cover and case in free state Gearbox length
Clearance between case and cover
≤1000
≤0. 08
>1000~2000
≤0.12
>2000~3000
≤0.15
mm
>3000~4000
≤0. 20
5.3.7 After the gear transmission device is assembled, it shall be tested for idling according to the design or process requirements. And it shall run smoothly without abnormal noise. 5.3.8 The cleanliness of the gearbox shall comply with the provisions of JB/T7929. 5.4 Assembly of pulley and chain drive
5.4.1 For pulleys with drive shafts, the tolerance of parallelism of the two axes is (0.15/1000)L (L--the center distance between the two axes), and the middle planes of the wheel widths of the two wheels should be on the same plane, with a tolerance of 0.5mm. 5.4.2 The geometric center lines of the teeth of the driving sprocket and the driven sprocket should coincide, and the offset error should not exceed 0.015L (L--the center distance between the two sprockets).
5.4.3 When the chain is meshing with the sprocket, the working side of the chain must be tightened and the meshing should be smooth. 5.4.4 The initial sag of the non-working side of the chain should be adjusted according to 1% to 5% of the center distance between the two sprockets. 5.5 Assembly of coupling
7
5
The upper and lower bearing shells should be in good contact with the relevant bearing seat holes, and the contact rate within the allowable contact angle should meet the requirements of Table 5. Table 5. Contact requirements between the upper and lower bearing outer shells and the relevant bearing seat holes. Contact requirements
item
contact angle.
Mesh
upper tile
thin oil lubrication
grease lubrication
e angle inner contact rate
tile side clearance 6||tt ||mm
130°±5*
120°±5*
60%
Lower tile
150*±5°||tt ||140°±5*
70%
When D≤200mm, n.65mm feeler gauge is not difficult to insert. When D>200mm, 0.10mm feeler gauge is not allowed to be inserted
5.2.6 The parts other than the inner hole of the upper and lower bearing shells that are in contact with the relevant journal 4 need to be machined out of the oil mold (C, shown in the figure in Table 6). The wedge shape gradually transitions from the maximum to zero starting from the tile mouth. The maximum value of the Australian shape is connected. Table 6 specifies. 5
Oil
Thin oil lubrication
Grease slipper
Class maximum value C
Cc
JB/T5000.10—1998
Table 6 Upper and Lower Bearing Oil Dimensions
Within the range of 10~15mm from both ends of the bearing
C,c
Middle part
C, 2C
Go; C value is the maximum fit limit of the shaft,
5.2.7
Upper (lower) bush
The relevant journals are in good contact. The contact spots within the contact angle range are specified in Table 7. Table 7 The contact requirements between the inner holes of the upper and lower bearing shells and the relevant journals.
Thin oil lubrication
120°
Grease lubrication
90*
. Number of contact spots within the angular range/25mm×25mm bearing inner diameter
Shaft speed
≤130
>300~500
>500~1000
> 1000
≤180
5
6
mm
>180~360|>360~500
3||tt| |5
2
5.2.8 The assembly of the integral shaft sleeve can be press-fitted or cold-fitted according to the size of the interference. 5.2.9 After the shaft sleeve is inserted into the machine part, the inner diameter of the shaft sleeve and the shaft should meet the design requirements. If necessary, it can be repaired and scraped appropriately to ensure it. The joint surfaces of the two pieces have been colored and combined, and the contact traces should be evenly distributed. The uncontacted parts of the two pieces should not exceed the square value specified in Table 8 within the limited area. Table 8 Uniform contact limit value
Length parameter range
260
>200~400
>400~860
Limited square value||tt ||25×25
40×40
60× 60
The length parameter range refers to the length of the rectangular plane. The length parameter flower width
>800~1600|| tt||>160
The length of the expanded graphic
limited block value
80×80
100×100
mm||tt| |If you want to combine the width of the surface with a small hand or if it is equal to the limited square value in the selected grade, you can downgrade to the corresponding grade (combined with the width of the surface > greater than the limited 2
use the grade with a fixed square value side length,
6
JB/T5000.10-1998
5.2.10 The bearing body of the spherical bearing and the spherical seat should be in uniform contact. Check with the coloring method. The contact rate should not be less than 70%. 5.2.11 The scraping contact requirements for alloy bearing linings are the same as 5.2.7. The scraping amount shall not be greater than 1/30 of the wall thickness of alloy bearing linings. 5.2.12 The alloy bearing linings are not allowed to be used when the surface is yellow. No nucleation is allowed within the contact angle, and the nucleation area outside the contact angle shall not exceed 10% of the total area of ??the non-contact area. 5.3 Gear and gearbox assembly
5.3.1 Gear (worm gear) reference end surface and The shaft shoulder (or positioning sleeve end face) should be fit and checked with a 0.05mm feeler gauge, and the verticality requirements of the gear reference end face and the axis should be ensured. 5.3.2 The axial misalignment of the meshing cylindrical gear pair should comply with the following. Regulations: a) When the tooth width B ≤ 100mm, the misalignment AB ≤ 0.05B; b) When the tooth width B > 100mm, the misalignment AB ≤ 5mm, 5.3.3 The tooth surface contact spots when the gear (worm gear) pairs are aligned. Less than the requirements of Table 9. The distribution position of the contact points should be close to the middle of the tooth surface, and no contact between the tooth tip and the tooth end is allowed. Table 9
Tooth surface contact spots
Cylinder gear
Accuracy level
5
6
?
8| |tt||9
10
11
5.3.4
5.3.5
along tooth quotient
55||tt ||50
45
40
30
25
20
along the tooth length
80||tt ||70
60
50
40
30
30
drawing dimension
gear||tt| |High along the tooth
65~85
55~75
40~70
30~60
%
Along the tooth length
6080
50~70
30~65
25~55
After the gear (worm gear) assembly, the tooth side clearance should be checked and comply with Drawing or process requirements. Bevel gears should be assembled according to the processing matching number. Cochlear
Lotus tooth height
65
55
45
30
wheel
along the tooth length||tt ||60
50
40
30
The joint surface of the gear box and cover should be in good contact. In the free state, the gap between the box cover and the box body should not exceed the specified value in Table 10: 5.3.6 | one part. Table 10 Allowable clearance between box cover and box body in free condition Gear box length
Gap between box body and adhesive cover
≤1000
≤0. 08
> 1000~2000
≤0.12
>2000~3000
≤0.15
mm
>3000~4000
≤0. 20
5.3.7 After the gear transmission is assembled, an empty running test shall be carried out according to the design or process requirements. And it should run smoothly and without abnormal noise. 5.3.8 The cleanliness of the gearbox should comply with the requirements of JB/T7929. 5.4 Pulley and chain drive assembly
5.4.1 For the pulley of the horizontal transmission shaft, the parallelism tolerance of the two axes is (0.15/1000) L (L - the center distance between the two axes). The wide middle plane should be on the same plane, with a tolerance of 0.5mm. 5.4.2 The geometric center lines of the gear teeth of the driving sprocket and the driven sprocket should coincide, and their offset error should not be greater than 0.015L (L - the center distance between the two sprockets).
5.4.3 When the chain meshes with the sprocket, the working side of the chain must be tightened and the meshing should be guaranteed to be smooth. 5.4.4 The initial sag of the non-working side of the chain is adjusted according to 1% to 5% of the center distance between the two sprockets. 5.5 Coupling assembly
7
10—1998
Table 6 Upper and lower bearing oil dimensions
Within the range of 10~15mm from both ends of the bearing
C,c
Middle part||tt| |C,2C
Go; C value is the maximum fit limit of the shaft,
5.2.7
upper (lower) bush
after scraping the inner hole of the bearing bush , should be in good contact with the relevant journal. The contact spots within the contact angle range are specified in Table 7. Table 7. The contact requirements between the inner holes of the upper and lower bearing bushes and the relevant journals.
Thin oil lubrication
120°
Grease lubrication
90*
. Number of contact spots within the angular range/25mm×25mm bearing inner diameter
Shaft speed
≤130
>300~500
>500~1000
> 1000
≤180
5
6
mm
>180~360|>360~500
3||tt| |5
2
5.2.8 The assembly of the integral shaft sleeve can be press-fitted or cold-fitted according to the size of the interference. 5.2.9 After the shaft sleeve is inserted into the machine part, the inner diameter of the shaft sleeve and the shaft should meet the design requirements. If necessary, it can be repaired and scraped appropriately to ensure it. The joint surfaces of the two pieces have been colored and combined, and the contact traces should be evenly distributed. The uncontacted parts of the two pieces should not exceed the square value specified in Table 8 within the limited area. Table 8 Uniform contact limit value
Length parameter range
260
>200~400
>400~860
Limited square value||tt ||25×25
40×40
60× 60
The length parameter range refers to the length of the rectangular plane. The length parameter flower width
>800~1600|| tt||>160
The length of the expanded graphic
limited block value
80×80
100×100
mm||tt| |If you want to combine the width of the surface with a small hand or if it is equal to the limited square value in the selected grade, you can downgrade to the corresponding grade (combined with the width of the surface > greater than the limited 2
grade with fixed square value side length,
6
JB/T5000.10-1998
5.2.10 The bearing body of the spherical bearing and the spherical seat should be in uniform contact. Check with the coloring method. The contact rate should not be less than 70%. 5.2.11 The scraping contact requirements for alloy bearing linings are the same as 5.2.7. The scraping amount shall not be greater than 1/30 of the wall thickness of alloy bearing linings. 5.2.12 The alloy bearing linings are not allowed to be used when the surface is yellow. No nucleation is allowed within the contact angle, and the nucleation area outside the contact angle shall not exceed 10% of the total area of ??the non-contact area. 5.3 Gear and gearbox assembly
5.3.1 Gear (worm gear) reference end surface and The shaft shoulder (or positioning sleeve end face) should be fit and checked with a 0.05mm feeler gauge, and the verticality requirements of the gear reference end face and the axis should be ensured. 5.3.2 The axial misalignment of the meshing cylindrical gear pair should comply with the following. Regulations: a) When the tooth width B ≤ 100mm, the misalignment AB ≤ 0.05B; b) When the tooth width B > 100mm, the misalignment AB ≤ 5mm, 5.3.3 The tooth surface contact spots when the gear (worm gear) pair are aligned are not Less than the requirements of Table 9. The distribution position of the contact points should be close to the middle of the tooth surface, and no contact between the tooth tip and the tooth end is allowed. Table 9
Tooth surface contact spots
Cylinder gear
Accuracy level
5
6
?
8| |tt||9
10
11
5.3.4
5.3.5
along tooth quotient
55||tt ||50
45
40
30
25
20
along the tooth length
80||tt ||70
60
50
40
30
30
drawing dimension
gear||tt| |High along the tooth
65~85
55~75
40~70
30~60
%
Along the tooth length
6080
50~70
30~65
25~55
After the gear (worm gear) assembly, the tooth side clearance should be checked and comply with Drawing or process requirements. Bevel gears should be assembled according to the processing matching number. Cochlear
Lotus tooth height
65
55
45
30
wheel
along the tooth length||tt ||60
50
40
30
The joint surface of the gear box and cover should be in good contact. In the free state, the gap between the box cover and the box body should not exceed the specified value in Table 10: 5.3.6 | one part. Table 10 Allowable clearance between box cover and box body in free condition Gear box length
Gap between box body and adhesive cover
≤1000
≤0. 08
> 1000~2000
≤0.12
>2000~3000
≤0.15
mm
>3000~4000
≤0. 20
5.3.7 After the gear transmission is assembled, an empty running test shall be carried out according to the design or process requirements. And it should run smoothly and without abnormal noise. 5.3.8 The cleanliness of the gearbox should comply with the requirements of JB/T7929. 5.4 Pulley and chain drive assembly
5.4.1 For the pulley of the horizontal transmission shaft, the parallelism tolerance of the two axes is (0.15/1000) L (L - the center distance between the two axes). The wide middle plane should be on the same plane, with a tolerance of 0.5mm. 5.4.2 The geometric center lines of the gear teeth of the driving sprocket and the driven sprocket should coincide, and their offset error should not be greater than 0.015L (L - the center distance between the two sprockets).
5.4.3 When the chain meshes with the sprocket, the working side of the chain must be tightened and the meshing should be guaranteed to be smooth. 5.4.4 The initial sag of the non-working side of the chain is adjusted according to 1% to 5% of the center distance between the two sprockets. 5.5 Coupling assembly
7
10—1998
Table 6 Upper and lower bearing oil size
10~15mm from both ends of the bearing
C,c
Middle part
C,2C
To; C value is the maximum fit limit of the shaft,
5.2.7
Upper (lower) bearing
After the inner hole of the bearing is scraped, it should have good contact with the relevant journal. The contact spots within the contact angle range shall be in accordance with the provisions of Table 7. Table 7 The contact angle required for the contact between the inner hole of the upper and lower bearings and the relevant journals.
Thin oil lubrication
120°
Grease lubrication
90*
. Number of contact spots within the angular range/25mm×25mmInner diameter of bearing
Shaft speed
≤130
>300~500
>500~1000
>1000
≤180
5
6
mm
>180~360
3
5
2
5.2.8 The assembly of the integral sleeve can be press-fitted or cold-fitted according to the size of the interference. 5.2.9 After the sleeve is installed in the machine, the inner diameter of the sleeve and the shaft should meet the design requirements, and appropriate scraping can be performed to ensure it if necessary. The contact marks of the two joint surfaces should be evenly distributed after coloring and grinding, and the non-contact part should not exceed the block value specified in Table 8 within the specified area. Table 8 Limit value of evenly spaced contact
Length parameter range
260
>200~400
>400~860
Limited block value
25×25
40×40
60× 60
Length parameter range refers to the length of the rectangular plane. Length parameter circumference
>800~1600
>160
The length of the unfolded figure
Limited block value
80×80
100×100
mm
If the width of the combined surface is too small or equal to the limited block value in the selected grade, the corresponding grade can be reduced (the width of the combined surface> is greater than the limited block value side length grade,
6
JB/T5000.10-1998
5.2.10 The bearing body and spherical seat of the spherical bearing should be in uniform contact. The contact rate should not be less than 70% when checked by the color coating method. 5.2.11 The contact requirements of the scraping and grinding of the alloy bearing lining should be Seek the same as 5.2.7. The scraping amount shall not exceed 1/30 of the thickness of the alloy bearing liner. 5.2.12 The alloy bearing liner shall not be used when the surface is yellow. There shall be no core separation phenomenon within the specified contact angle. The core separation area outside the contact angle shall not be greater than 10% of the total area of ??the non-contact area. 5.3 Assembly of gears and gearboxes
5.3.1 The reference end face of the gear (worm wheel) and the shaft shoulder (or the end face of the positioning sleeve) shall fit together. Use a 0.05mm feeler gauge to check that it does not penetrate. And the verticality requirements of the reference end face of the gear and the axis shall be guaranteed. 5.3.2 The axial misalignment of the meshing cylindrical gear pair shall comply with the following provisions: a) When the tooth width B≤100mm, the misalignment AB≤0.05B; b) When the tooth width B>100mm, the misalignment AB≤5mm. 5.3.3 The tooth surface contact spot of the gear (worm wheel) pair when it is engaged shall not be less than the provisions of Table 9. The distribution position of the contact spots should be close to the middle of the tooth surface, and no contact is allowed between the tooth top and the tooth end. Table 9
Contact spots on tooth surface
Cylindrical gear
Accuracy grade
5
6
?
8
9
10
11
5.3.4
5.3.5
Along the tooth quotient
55
50
45
40
30
25
20
Along the tooth length
80
70||t t||60
50
40
30
30
Drawing dimension
Gear
Along the height
65~85
55~75
40~70
30~60
%
Along the tooth length
6080
50~70
30~65
25~55
After the gear (worm gear) pair is assembled, the tooth side clearance should be checked and it should meet the drawing or process requirements. Bevel gears should be assembled according to the processing matching number. Worm
Lo tooth height
65
55
45
30
Wheel
Along tooth length
60
50
40
30
The joint surface between the gearbox and the cover should be in good contact. In the free state, the gap between the cover and the box body should not exceed the specified value in Table 10: 5.3.6
After tightening, check with a 0.05mm feeler gauge, and the partial insertion should not exceed one third of the joint surface width. Table 10 Allowable clearance between cover and case in free state Gearbox length
Clearance between case and cover
≤1000
≤0. 08
>1000~2000
≤0.12
>2000~3000
≤0.15
mm
>3000~4000
≤0. 20
5.3.7 After the gear transmission device is assembled, it shall be tested for idling according to the design or process requirements. And it shall run smoothly without abnormal noise. 5.3.8 The cleanliness of the gearbox shall comply with the provisions
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