JB/T 9003-1999 Crane three-in-one reducer JB/T9003-1999 standard download decompression password: www.bzxz.net

ICS21.120.20
Machinery Industry Standard of the People's Republic of China
JB/T9003—1999
Three-in-one reducer for cranes
GearboxeswithbrakemotorsforcranesPublished on 1999-06-28
National Bureau of Machinery Industry
Implemented on 2000-01-01
JB/T9003-1999
This standard is a revision of ZBJ19027-90 "QS type reducer for cranes". During the revision, editorial changes were made to the original standard: the main technical content has not changed
This standard replaces ZBJ19
9027-90 from the date of implementation.
Appendix A of this standard is a reminder appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Hoisting Machinery. The responsible drafting unit of this standard is Beijing Hoisting and Conveying Machinery Research Institute. The main drafters of this standard are Guo Yachun, Wan Mingyan, Yang Deming and Cui Zhenyuan. 1 Scope
Machinery Industry Standard of the People's Republic of China
Three-in-one reducer for cranes
Gearboxes with brake motors for cranes JB/T9003—1999
Replaces ZBJ19027—90
This standard specifies the type, basic parameters, dimensions, technical requirements, test methods and inspection rules of three-in-one reducers for cranes (hereinafter referred to as reducers).
This standard is applicable to reducers for the operating mechanism of 3.2~50t bridge type cranes, and is also applicable to reducers for transmission mechanisms in various mechanical equipment such as transportation, metallurgy, mining, petroleum, chemical industry, construction and light industry. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB191—1990
GB/T1031—1995
GB/T 11841996
GB/T1801—1979
GB/T3077—1988
GB/T3478.1—1995
GB/T3478.2—1995
GB/T3811—1983
GB/T5903—1995
GB/T 6404—1986
GB/T9439—1988
GB/T10095—1988
GB/T133061991
GB/T133841992
JB/T9050.3—1999
3 Type
3.1 Structural type
Packaging, storage and transportation graphic symbols
Surface roughness parameters and their values
Shape and position tolerances without tolerance values
Tolerances and fit dimensions to 500mm holes, shafts tolerance zones and fits Alloy structural steel technology Conditions
Cylindrical spur involute spline, module, basic tooth profile toleranceCylindrical spur involute spline 30° pressure angle dimension tableCrane design specifications
Industrial closed gear oil
Method for determining the sound power level of gear device noiseGray cast iron parts
Involute cylindrical gear accuracy
General technical conditions for packaging of electromechanical products
Loading test method for cylindrical gear reducer
The reducer adopts three-stage involute cylindrical gear transmission, the axis center line is arranged according to the broken line, and is driven by a winding motor with brake or a variable-pole squirrel cage motor with brake. Its structural type is shown in Figure 1. Approved by the State Bureau of Machinery Industry on June 28, 1999 and implemented on January 1, 2000
3.2 Installation type
Gear shaft
Internal chain shaft
JB/T9003—1999
Torque support
Motor
Coupling
The reducer and the running wheel shaft are plug-in, and the balance is maintained through the torque support hole on the reducer. They can be configured as separate drive and centralized drive.
3.2.1 Separate drive is shown in Figure 2.
Small starting point support
3.2.2 Centralized drive is shown in Figure 3.
Model representation method
3.4 ​​Marking example
JB/T9003—1999
Nominal transmission ratio
Frame code
Product code
The frame code of the reducer is 10 (center distance 200mm), and the transmission ratio is 25. The mark is: reducer QS10-25
JB/T9003—1999
4 Basic parameters and dimensions
4.1 Center distance
The center distance between the input shaft and the output shaft of the reducer, its value is detailed in Table 1. Table 1
Frame code
Center distance mm
Nominal transmission ratio
The allowable limit deviation of the actual transmission ratio is 4%. The nominal transmission ratio of the reducer series is detailed in Table 2. Table 2
Nominal transmission ratio
4.3 Dimensions
4.3.1 For details of internal spline shaft and connection dimensions, please refer to Figure 4 and Table 3. Figure 4
Spline pair
INT/EXT21ZX2mX30P×6H/6h
GB/T3478.11995
INT/EXT24Z×2m×30P×6H/6h
GB/T3478.1—1995
INT/EXT31ZX2mX30PX6H/6h
GB/T 3478.1—1995
INT/EXT27ZX3mX30PX6H/6h
GB/T3478.11995
INT/EXT35ZX3mX30P×6H/6h
GB/T3478.11995
JB/T9003—1999
Internal spline
Major diameter D
External spline
Major diameter d
4.3.2 For details on the installation and overall dimensions of the reducer, please refer to the provisions of Figure 5 and Table 4. AA
Machine base code
1251757516820160
160/3582302102020082.75
200|45229727425250
2505663603463031292.25
JB/T9003-1999
148$14M10
Φ20M10235.7518847.75
Φ22M12| |tt||28022M16307.2525561.25
315705440400|40340115.7528040M16331.2526465.75100
5 Technical requirements
5.1 Applicable conditions of reducer
a) Gear circumferential speed is not more than 20m/s; b) Input shaft speed is not more than 1500r/min;) Working environment temperature -40~+45℃;
d) Can run in both forward and reverse directions.
5.2 Load capacity of reducer
160156
When the input shaft speed is 1400r/min and the mechanism working level is M6 as specified in GB/T3811, the load capacity of the reducer shall comply with the provisions of Table 5; the load capacity of the continuous working reducer with an input shaft speed of 1400r/min shall comply with the provisions of Table 6. The conversion method of power values ​​of different mechanism working levels of the crane is shown in Appendix A (Suggested Appendix). 5.3 Efficiency
Under rated load, the efficiency of the reducer should not be less than 94%. 5
Nominal transmission ratio
Power, torque
Allowable input shaft power
Output torque
Allowable input shaft power
Output torque
Allowable input shaft power
Output torque
Allowable input shaft power
Output torque
Allowable input shaft power
Output torque
The input shaft speed is 1400r/min
The working level is M6.
Nominal transmission ratio
Power, torque
Allowable input shaft power
Output torque
Allowable input shaft power
Output torque
Allowable input shaft power
Output torque
Allowable input shaft power
Output torque
The input shaft speed is 1400r/min,
Continuous working type.
JB/T9003—1999
5.4Noise
The noise of the reducer shall comply with the provisions of Table 7.
Frame code
Noise dB (A)
5.5Box and box cover
5.5.1The casting roughness shall be subjected to aging treatment. JB/T9003—1999
5.5.2 There should be no casting defects that affect the performance, and the non-machined surface should be flat and smooth without burrs and flash. 5.5.3 The roughness of the split surface of the box body and the box cover should adopt R in GB/T1031, and its value is 3.2μm. 5.5.4
The flatness of the partial surface of the box body and the box cover should not be lower than Grade 7 in Table B1 of GB/T1184-1996. 16
The dimensional accuracy of the bearing hole should not be lower than H7 in GB/T1801, and the surface roughness should adopt R in GB/T1031, and its value is 5.5.5
3.2μm.
5.5.6 The perpendicularity between the center line of the bearing hole and the split surface and the cylindricity of the bearing hole shall not be lower than Grade 7 in Table B1 of GB/T11841996 5.5.7
The limit deviation of the center distance of the bearing hole shall comply with the provisions of Table 8 Table 8
Center distance
>50~80
>80~120
>120~180
>180~250
5.5.8 The parallelism tolerances f and f of the center line of the bearing hole shall comply with the provisions of Table 9 when measured on the bearing span. Table 9
Bearing span L.
Parallelism tolerance
40~100
, after the box body and the box cover are assembled, the edges should be flush, and the allowable misalignment should not be greater than the provisions of Table 10. 5.5.9
Machine base code
Allowable misalignment
5.6 Gears and gear shafts
5.6.1 The rough parts of gears and gear shafts should be forgings. 08
>100~160
>250~315
5.6.2 The hardness of the tooth surface after heat treatment is 56~62HRC: the depth of the hardness layer should meet the requirements of Table 11; the hardness of the core should reach 26~32HRC. The hardness of the internal spline shaft after quenching and tempering is 241~269HB. Gear module
Hardness layer depth
0.25~0.35
JB/T9003-1999
0.35~0.55
Gear teeth should be free of defects such as cracks, slag inclusions, white spots, etc. Gear tooth surface should be free of abrasions and scratches.
5.6.5 The accuracy grade of the gear should not be lower than Grade 7 in GB/T10095. 2.5
0.45~0.65
0.55~0.75
The accuracy of the gear reference hole, the position tolerance of the reference end face and the surface roughness should comply with the provisions of Table 12. 5.6.6
Gear reference hole
Gear reference surface
Dimensional accuracy
End face circular runout
0.70~0.90
Surface roughness R
The dimensional accuracy, end face circular runout and surface roughness of the reference journal and shoulder of the gear shaft and internal spline shaft matching the bearing shall comply with the provisions of 5.6.7
Combined with Table 13.
Reference journal
Dimensional accuracy
End face circular runout
Surface roughness R.
8The dimensional accuracy, surface roughness, roundness and circular runout of the shaft extension diameter of the first-stage gear shaft shall comply with the provisions of Table 14. 5.6.8
Shaft extension diameter
Dimensional accuracy
Circular runout
The matching accuracy of the internal spline shaft and the inner hole of the gear shall comply with the provisions of Table 15. The dimensional accuracy, position tolerance and surface roughness of the gear shaft and
gear inner hole
keyway shall comply with the provisions of Table 16. Table 16
Keyway width tolerance
Symmetry of keyway width relative to the axis
Surface roughness R.
Gear shaft, internal spline shaftwww.bzxz.net
Surface roughness R
5.6.11 Involute internal spline shaft
JB/T9003—1999
The basic parameters and dimensions of the spline shall comply with the relevant provisions in GB/T3478.1 and GB/T3478.2. The matching type of involute spline with standard pressure angle of 30° is H/h: its tolerance grade is grade 6. 5.6.12 The radial runout tolerance of tooth base surface shall comply with the provisions of Table 17. Table 17
Gear pitch circle diameter
Gear tip cylindrical locating surface radial runout tolerance
The value of gear working surface roughness R is 1.6μm. ≤125
The combination of precision inspection items of gears shall comply with the provisions of Table 18. Table 18
Tolerance group
Inspection items
Fp(Fpk)
The cumulative tolerance F of the tooth pitch and the cumulative tolerance F value of k tooth pitches shall comply with the provisions of Table 19. Table 19
Pitch arc length L
Fp (Fpk)
>20~32
>32-50
Yuan mnz
1F, and F are checked in the table according to the pitch arc length L, and L=cosβ
kYuan mn
2When it is necessary to check F, take L
>50~80
(k is an integer from 2 to less than z12)
5.6.16 Tooth profile tolerance f, pitch limit deviation ±/m shall comply with the provisions of Table 20 Table 20
Pitch circle diameter
>125~400
Normal module
5.6.17 Tooth tolerance F. It shall comply with the provisions of Table 21. >80~160
>125~400
>160~315
>315~630
Gear width
JB/T9003—1999
>40~100
5.6.18 The contact spot of the gear pair should be not less than 45% along the tooth height direction and not less than 60% along the tooth length direction. The distribution position of the contact spot should be close to the middle of the tooth surface.
The minimum limit backlash jnmin of the gear pair should comply with the provisions of Table 22. Table 22
Center distance
>30~50
>50~80
>80~120
Tooth thickness limit deviation Es, Esi, tolerance T shall comply with the provisions of Table 23. Table 23
Pitch circle diameter
>125~400
5.7 Assembly
Normal module
>1.25~3.5
>1.25~3.5
Upper deviation
Lower deviation
5.7.1 The inner ring of the bearing must be close to the shoulder of the shaft, and it should not pass the inspection with a 0.05mm feeler gauge>120~180
>180~250
5.7.2 Clean all parts with 10℃ soda water or kerosene. The inner surface of the box should be primed first, then painted with red and white oil-resistant paint. After the outer surface of the box is primed, paint with beautiful color and easy heat dissipation should be applied, and the shaft extension should be coated with anti-rust oil. 5.7.3 All static joint surfaces should be coated with sealant, and the reducer should not leak oil after assembly. 5.7.4 Cleanliness of reducer
Use a 200-mesh filter to filter the lubricating oil in the box. The net weight of the impurities G. should not be greater than the values ​​listed in Table 24. Table 24
Machine base code
Net weight of impurities G
5.8 Lubrication of reducer
Splash lubrication is adopted. The lubricating oil should be selected from L-CKC100, L-CKC150 or L-CKC220 in GB/T5903 according to the working conditions. 10
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