This standard specifies the general technical conditions for cylindrical gear reducers. This standard applies to single-stage, two-stage and three-stage cylindrical gear reducers (hereinafter referred to as reducers) with a low-speed center distance a≤1000mm. It also applies to single-stage, two-stage and three-stage planetary gear reducers (hereinafter referred to as reducers) with a low-speed turntable radius R≤300mm. JB/T 9050.1-1999 General Technical Conditions for Cylindrical Gear Reducers JB/T9050.1-1999 Standard download decompression password: www.bzxz.net

ICS21.200
Standard of the Machinery Industry of the People's Republic of China
JB/T9050.1-1999
Cylindrical gear reducer
General technical requirements
General technical requirement of reduction cylindrical gear units1999-06-28Published
National Machinery Industry Bureau
2000-01-01Implementation
JB/T9050.1-1999
This standard is an editorial revision of ZBJ1900988 "Cylindrical gear reducer", and the main technical content has not changed. Appendix A of this standard is the appendix of the standard.
This standard replaces the revision of ZBJ19009-88 "General Technical Requirements" from the date of implementation. During the revision, the original standard was revised. This standard was proposed and managed by the Metallurgical Equipment Standardization Technical Committee. Drafting units of this standard: Xi'an Heavy Machinery Research Institute, Shanghai Electromechanical Design Institute Main drafters of this standard: Xu Hongjun, Wang Peibian, Chen Yawen. This standard was first issued in July 1988.
Mechanical Industry Standard of the People's Republic of China
Cylindrical Gear Reducer
General Technical Requirements
General Technical Requirement of Reduction Cylindrical Gear Units 1 Scope
This standard specifies the general technical requirements of cylindrical gear reducers. JB/T9050.1—1999
Replaces ZBJ19009—88
This standard applies to single-stage, two-stage and three-stage cylindrical gear reducers (hereinafter referred to as reducers) with a low-speed stage center distance a≤1000mm, and also applies to single-stage, two-stage and three-stage planetary gear reducers (hereinafter referred to as reducers) with a low-speed stage slewing frame radius R≤300mm. Cited 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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB 191—1990
GB/T 1184 — 1996 | | tt | | tt | 8831—1999
JB/T8853—1999
JB/T9050.3—1999
3 Technical requirements
3.1 General technical requirements
Packaging, storage and transportation, graphic symbols
Shape and position tolerances, unmarked tolerance values
Calculation of cylindrical gear load capacity
Rust-proof packaging
Determination method of sound power level of gear device noise, involute cylindrical gear accuracy
Cleanliness of gear transmission device
General technology for packaging of electromechanical products Conditions
General technical conditions for heavy machinery Cast iron parts
General technical conditions for heavy machinery Forgings
General technical conditions for heavy machinery Cutting parts General technical conditions for heavy machinery Coating
Selection method for industrial gear lubricants
Cylindrical gear reducer
Loading test method for cylindrical gear reducer
3.1.1 The reducer is allowed to work normally within the following range: a) Ambient temperature is -40~+40℃;
Note: When the ambient temperature is below 0℃, the lubricating oil should be preheated before starting. Approved by the State Bureau of Machinery Industry on June 28, 1999, and implemented on January 1, 2000
JB/T9050.1-1999
b) The load is stable or variable, and the direction of operation should be indicated for continuous operation: c) Applicable to unidirectional or reversible operation, and the direction of operation should be indicated for unidirectional operation: d) The maximum speed of the high-speed shaft does not exceed 1500r/min: Note: When the speed of the high-speed shaft exceeds 1500r/min, the technical requirements of the reducer should be determined by negotiation between the manufacturer and the user. e) The circumferential speed of the external meshing involute cylindrical gear does not exceed 20m/s. The circumferential speed of the internal meshing involute cylindrical gear does not exceed 15m/s:
The working environment of the reducer should be non-corrosive; g) The lubricating oil of the reducer is shown in Appendix A (Appendix of the standard). 3.1.2 The basic parameters of the cylindrical gear reducer, such as center distance, transmission ratio, tooth width coefficient, center height, etc., should comply with the provisions of JB/T8853. 3.1.3 The reducer shall be allowed to withstand a short-term overload of one times the load generated when the motor starts. The total cycle time of the allowable short-term overload shall be specified in the standard or technical conditions of the specific model of the reducer. 3.1.4 The structural design of the reducer shall take into account that the radial load in the middle of the input shaft and the output shaft extension shall not be less than the value in Table 1 (except for special reducers).
Output shaft
Input shaft
Note: T2
Output torque, N·m; T
Number of transmission stages
Two-stage and three-stage
Single-stage, two-stage and three-stage
Input torque, N·m.
The service life of the reducer shall not be less than 25000h. The bearing life shall not be less than 10000h. The gear pair accuracy shall not be less than the provisions of Table 2. Table 2
Gear Circumferential Speed
Helical Gear Pair
Spur Gear Pair
>12~18
Radial Load at Middle Part of Shaft Extension
50/~125
According to GB/T10095
Soft Tooth Surface and Medium Hard Tooth Surface Gear
Note: The 1st and 1st tolerance groups of planetary gear transmission shall be one level higher than that in this table. 3.1.7 The tooth surface contact spot of hard tooth surface gear pair and medium hard tooth surface gear pair shall not be lower than the value specified in Table 3. 2
Hard Tooth Surface Gear
Hard Tooth Surface Gear Pair
Medium Hard Tooth Surface Gear (300-360HB)
1 Measure the contact spot under slight braking.
JB/T9050.1-1999
2 The distribution position of the contact spot should be close to the middle of the tooth surface, and the tooth top and the edges at both ends are not allowed to have contact spots
3 For gear pairs with tooth length modification and tooth top modification, the distribution position and size of the contact spots can be determined by the gear pair, and the contact spots are generally not greater than 90% of the values ​​in this table.
The minimum normal limit backlash of the gear pair should comply with the provisions of Table 4. Table 4
Center distance
Minimum normal limit backlash
Center distance
Minimum normal limit backlash
96~120
>315~400
184~230
>80~125
112~140
>400~500
200~250
>125~180
128~160
>500~630
224~280
The reducer shall not have oil leakage or oil seepage, and dirt and water shall not seep into the body. The overlap between the reducer body and the cover shall not exceed the requirements of Table 5. Table 5
Maximum length of housing
≤1000
>1000~2000
Parts weighing more than 20kg should have lifting hooks (rings). >180~250
148185
>630~800
256~320
Overlap on each side (symmetrical distribution)
3.1.12The cleanliness of the reducer cavity and its inspection method shall comply with the provisions of GB/T11368. 3.1.13The displacement of the center line of the anchor bolt hole shall not exceed 0.2 (Dd) mm. Note: D
Nominal diameter of the anchor bolt hole, mm: d
Nominal diameter of the anchor bolt, mm.
>250~315
168~210
>800~1000
288~360
3.1.14 The materials used for the main parts of the reducer (gears, shafts and body, etc.) shall comply with the requirements of the relevant current material standards and have a certificate of conformity from the manufacturer.
3.1.15 In addition to calculating the rated transmission power, the thermal power of hardened gear reducers and planetary gear reducers should also be calculated in order to determine the lubrication and cooling method and whether it is necessary to add lubrication and cooling devices. 3.1.16 When the reducer is in a low-temperature working environment, it can be heated by an electric heater or a steam heater. The heater should be located below the lubricating oil level. When electric heating is used, the electric power per unit area shall not exceed 0.7W/cm to prevent carbonization of the lubricating oil. 3.1.17 The transmission efficiency of each stage of a single-stage or multi-stage cylindrical gear reducer shall not be less than 0.98; the transmission efficiency of each stage of a single-stage or multi-stage planetary gear reducer shall not be less than 0.97.
Technical requirements for gear manufacturing
Gear inspection items are shown in Table 6.
Gear finishing technology
Tolerance group I
F, or F and Fw
or F and Fw
JB/T9050.1-1999
Tolerance group II
and f or f and
f and fo
When interchangeability is not required,
the following elements are allowed to be measured according to relative accuracy: Helix angle: its nominal value is the average value of the actual helix angle a)
b) Base pitch: its nominal value is the average value of the actual base pitch: Tolerance group IIII
c) Tooth thickness: the tooth thickness of the other matching gear in the gear pair should be calculated based on the actual tooth thickness of the first gear.
The surface roughness of the tooth surface should comply with the provisions of Table 7. Table 7
Tolerance group II
Accuracy grade
Pitch circle diameter
≤125
>125~400
>400~800
>800~1600
>1600~2500
≤125
>125~400
>400~800
>800~1600
>160 0-2500
≤125
>125~400
>400~800
>800~1600
>1600~2500
>125~400
>400~800
>800~1600||t t||>1600~2500
≥1~4
Tooth surface roughness R
1.6 (0.8)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)bzxZ.net
3.2 (1.6)
3.2 (1.6)
3.2 (1.6)
Gear pair
Contact spot and
>16~25
Tolerance group II
Accuracy grade
Pitch circle diameter
≤125
>125~400
>400~800
>800~1600
>1600~2500
1The values ​​in brackets apply to hardened gears. JB/T9050.1-1999
Table 7 (end)
2The surface roughness R of the tooth surface of nitrided gears is 1.6μm. 3.2.4Grinded gears should be trimmed
When hobbing gears, trimming hobs should generally be used. >4~8
3.2.5 The pinion of the ground gear pair is modified in tooth profile. The tooth profile modification dimensions are shown in Figure 1 and formula (1) and formula (2): sb
In the formula: As-
Tooth profile modification amount, μm;
Tooth profile error allowable value, μm:
Tooth width of small gear, mm;
Tooth width of large gear, mm;
Ab-Width difference between large and small gears, mm;
△b-Tooth profile modification length of small gear, mm. 3.2.6 Heat treatment of gears is shown in Appendix A.
3.3 Technical requirements for machine body manufacturing
3.3.1 The machine body can be made of castings or weldments. 3.3.2 Artificial aging treatment should be performed after casting or welding. b,-b,+ ab
As=4F+20
b≥Ab≤0.1bz+
3.3.3 The roughness R of the machine body separation and combination surface is 6.3μm, and the parallelism with the bottom plane is level 8 of GB/T1184. 3.3.4 The perpendicularity between the bearing hole and its end face of the machine body is level 8 of GB/T1184. 3.3.5
>16~25
When the machine body and the cover are freely combined, the separation and combination surfaces should be tightly fitted, and the gap should be checked with a 0.05mm feeler gauge. The insertion depth of the feeler gauge shall not exceed 5
One third of the width of the separation and combination surface
JB/T9050.1-1999
3.3.6 The center distance limit deviation f, center line parallelism f and f of the gear bearing hole shall meet the requirements of GB/T10095. 3.3.7 The center line of the bearing hole should coincide with its separation and joining surface, and the error should not exceed 0.3mm. 3.3.8 The body should not leak oil.
3.4 ​​Assembly technical requirements
3.4.1 The inner ring of the bearing must be close to the shaft shoulder or the distance ring, and it must not pass the inspection with a 0.05mm feeler gauge. 3.4.2 Adjust the bearing clearance according to the regulations or drawing requirements. 3.4.3 Check the minimum side clearance and contact spots of the gear pair according to this standard or the drawing requirements. 3.4.4 The inner wall of the body, cover and the surface of the unprocessed parts inside the reducer body should be painted with oil-resistant paint. The surface of the body, cover and other exposed non-processed parts can be painted according to the provisions of JB/T5000.12, or according to the user's requirements. 3.4.5 The bolts of the body cover separation and joining surface should be tightened according to the specified preload. The pre-tightening force can be added by using a torque wrench to add a pre-tightening torque, or by using a hydraulic bolt tensioner to add an axial force. The pre-tightening force is shown in Table 8. Table 8
Bolt diameter d
Use a torque wrench to add a pre-tightening torque MA
Use a bolt tensioner to add a pre-tightening axial force Fv
Note: The bolt strength level in this table is 8.8. When the bolt strength level is 5.6, the value in this table should be multiplied by a coefficient of 0.47: when the strength level is 10.9,
It should be multiplied by a coefficient of 1.41; when the strength level is 12.9, it should be multiplied by a coefficient of 1.69, 4 Test and inspection
4.1 The test of the reducer shall comply with the provisions of JB/T9053.3. 4.2 The reducer manufacturer shall have a complete inspection record file. Qualified products shall be issued with a certificate of conformity. 5 Marking, packaging, transportation and storage
5.1 Each product must be fixed with a label in a conspicuous position, and the requirements should comply with the provisions of GB/T13306, and indicate: a) Product model and name:
b) Main technical parameters (such as speed, power, torque, weight, etc.); c) Date of manufacture;
d) Product number:
e) Manufacturer's name.
5.2 Product packaging and transportation
5.2.1 The outer surface of the reducer shaft extension and key should be coated with anti-rust grease, and tightly wrapped with plastic cloth, or other protective measures should be adopted. 5.2.2 The gears, shafts and bearings of the reducer should be coated with lubricating grease. 5.2.3 The packaging, storage and transportation of the reducer should comply with the provisions of GB/T13384 and GB191. 5.3 The accompanying documents shall be packed in plastic bags and then put into wooden boxes, including: a) complete set of delivery notes and packing list; b) certificate of conformity; c) product installation and operating instructions, etc.
Manufacturing guarantee
JB/T9050.1-1999
If the user complies with the transportation, storage, installation and use conditions specified in this standard and product standards and relevant documents, if the reducer is damaged or cannot work normally due to poor manufacturing quality within 1 year from the date of delivery, the manufacturer shall repair or replace it for the user free of charge. 7
A1 Gear Lubricant
Gear lubricant is selected according to JB/T8831.
The lubricants selected for reducers are:
a) Anti-oxidation and anti-rust industrial gear oil;
b) Medium extreme pressure industrial gear oil:
c) High extreme pressure industrial gear oil.
JB/T9050.1-1999
Appendix A
(Standard Appendix)
Gear Lubrication and Heat Treatment
The ambient temperature during use shall not be lower than -5℃. The linear speed of the gear pitch circle shall not exceed 25m/s. When the above conditions are not met, other suitable lubricants should be selected.
Lubricant working reference temperature and temperature rise are shown in Table A1. Table A1
Lubricant type
Anti-oxidation and anti-rust gear oil
Medium extreme pressure industrial gear oil
High extreme pressure industrial gear oil
Working temperature
1When it is higher than the value in the table, it should be considered to add a cooling device or oil spray lubrication, and change the type of lubricant. 2When the pitch circle linear speed is less than 10m/s, oil immersion lubrication should be used, otherwise spray lubricant should be used. 2Gear roughness and heat treatment technical requirements
Maximum temperature rise
A2.1Gears should generally be made of forged steel. Gears with a diameter greater than or equal to 900mm can use forged (or hot rolled) gear ring welded gears, assembled with cylindrical pin bolts and wheel center, or hot-mounted with wheel center. A2.2 Technical requirements for quenched and tempered gears:
a) Tooth surface hardness: General quenched and tempered gears are below 283HB; medium hard tooth surface quenched and tempered gears are below 360HB: Note: The hardness value should be selected according to the value on the Brinell hardness table. b) Important gears can add material mechanical properties test and non-destructive testing requirements. Note: Important gears (hereinafter the same) refer to gears calculated according to the middle and upper limits of the fatigue limit in the block diagram of GB/T3480, that is, M. and M. A2.3 Technical requirements for carburized and quenched gears: a) Tooth surface hardness; 57+4HRC;
b) Effective hardened layer depth: (0.15~0.25)m, mm; c) Gear core hardness: 30~46HRC;
d) There should be no cracks on the tooth surface;
e) Important gears can add material mechanical properties test. 8
A2.4 Technical conditions for induction gears: JB/T9050.1-1999
a) Tooth surface hardness: 48~56HRC (important gears can take 50~56HRC); b) Effective hardened layer depth of tooth surface (0.15~0.35) m, mm: The deviation of effective hardened layer depth of tooth surface is generally not specified, and important gears are 15% of the effective hardened layer depth: c) Tooth bottom hardness: >40HRC (important gears>45HRC): Tooth bottom hardened layer depth: (0.10~0.30) m, mm; The deviation of tooth bottom hardened layer depth is generally not specified: d) Core quenching and tempering hardness:
e) There should be no cracks on the tooth surface:
f) Important gear materials should be tested for mechanical properties. A2.5 Nitriding gears
-Generally only suitable for gears with stable load or thin-walled structure and complex shape with m≤10mm. a) Tooth surface hardness
Tooth surface hardness of quenched and tempered steel: >450HV1. (Important gears are 650~700HV1o); nitrided steel tooth surface hardness: >600HV10 (important gears are 700~850HV1); b) See Table A2 for the effective nitriding hardened layer depth and its deviation: Table A2
c) Core hardness: According to quenching and tempering requirements:
d) Important gears should be subjected to mechanical property tests and non-destructive testing. A3 Tooth thickness tolerance of carburized and quenched gears produced in single-piece small batches The tooth thickness tolerance of carburized and quenched gears produced in single-piece small batches can be selected according to Table A3. Table A3
Gear type
Both large and small gears are carburized and quenched
Small gear is carburized and quenched
Large gear is quenched and tempered
Large gear
Nitriding effective hardening layer depth
Normal modulus
Tolerance of normal length
For reversible herringbone gears, the tooth thickness of the left and right helical teeth on the same gear should be kept consistent, and the relative limit deviation of the tooth thickness of the left and right helical teeth should be kept within 0.03~0.06mm. The limit deviation of the tooth thickness of the same set of planetary gears should also be kept consistent, and the relative limit deviation of the tooth thickness of each planetary gear should be kept within 0.02~0.05mm.
People's Republic of China
Mechanical Industry Standard
Cylindrical Gear Reducer
General Technical Conditions
JB/T9050.1-1999
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880X1230
Sheet 1
Word Count 20000
First Edition in December 1999 First Printing in December 1999 Print Count 1-500
Price 10.00 Yuan
99-1207
Mechanical Industry Standard Service Network: 6660065 Nitriding gears
-Generally only suitable for gears with stable load or thin-walled structure and complex shape with m≤10mm. a) Tooth surface hardness
Quenched and tempered steel tooth surface hardness: >450HV1. (Important gears are 650~700HV1o); nitrided steel tooth surface hardness: >600HV10 (important gears are 700~850HV1); b) The effective nitriding hardened layer depth and its deviation are shown in Table A2: Table A2
c) Core hardness: According to the quenching and tempering requirements:
d) Important gears should be subjected to mechanical property tests and non-destructive testing. A3 Tooth thickness tolerance of carburized and quenched gears produced in single-piece small batches The tooth thickness tolerance of carburized and quenched gears produced in single-piece small batches can be selected according to Table A3. Table A3
Gear type
Both large and small gears are carburized and quenched
Small gear is carburized and quenched
Large gear is quenched and tempered
Large gear
Nitriding effective hardening layer depth
Normal modulus
Tolerance of normal length
For reversible herringbone gears, the tooth thickness of the left and right helical teeth on the same gear should be kept consistent, and the relative limit deviation of the tooth thickness of the left and right helical teeth should be kept within 0.03~0.06mm. The limit deviation of the tooth thickness of the same set of planetary gears should also be kept consistent, and the relative limit deviation of the tooth thickness of each planetary gear should be kept within 0.02~0.05mm.
People's Republic of China
Mechanical Industry Standard
Cylindrical Gear Reducer
General Technical Conditions
JB/T9050.1-1999
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880X1230
Sheet 1
Word Count 20000
First Edition in December 1999 First Printing in December 1999 Print Count 1-500
Price 10.00 Yuan
99-1207
Mechanical Industry Standard Service Network: 6660065 Nitriding gears
-Generally only suitable for gears with stable load or thin-walled structure and complex shape with m≤10mm. a) Tooth surface hardness
Quenched and tempered steel tooth surface hardness: >450HV1. (Important gears are 650~700HV1o); nitrided steel tooth surface hardness: >600HV10 (important gears are 700~850HV1); b) The effective nitriding hardened layer depth and its deviation are shown in Table A2: Table A2
c) Core hardness: According to the quenching and tempering requirements:
d) Important gears should be subjected to mechanical property tests and non-destructive testing. A3 Tooth thickness tolerance of carburized and quenched gears produced in single-piece small batches The tooth thickness tolerance of carburized and quenched gears produced in single-piece small batches can be selected according to Table A3. Table A3
Gear type
Both large and small gears are carburized and quenched
Small gear is carburized and quenched
Large gear is quenched and tempered
Large gear
Nitriding effective hardening layer depth
Normal modulus
Tolerance of normal length
For reversible herringbone gears, the tooth thickness of the left and right helical teeth on the same gear should be kept consistent, and the relative limit deviation of the tooth thickness of the left and right helical teeth should be kept within 0.03~0.06mm. The limit deviation of the tooth thickness of the same set of planetary gears should also be kept consistent, and the relative limit deviation of the tooth thickness of each planetary gear should be kept within 0.02~0.05mm.
People's Republic of China
Mechanical Industry Standard
Cylindrical Gear Reducer
General Technical Conditions
JB/T9050.1-1999
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880X1230
Sheet 1
Word Count 20000
First Edition in December 1999 First Printing in December 1999 Print Count 1-500
Price 10.00 Yuan
99-1207
Mechanical Industry Standard Service Network: 666006
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