Some standard content:
ICS21.120.20
Machinery Industry Standard of the People's Republic of China
JB/T9002—1999
Reducer for Transportation Machinery
Gearboxes for transportation machinery1999-06-28 Issued
National Machinery Industry Bureau
2000-01-01 Implementation
JB/T9002-1999
Cited Standards
Type and Dimensions
Basic Parameters and Load Capacity
Technical Requirements
Test Methods
Inspection Rules
Marking, Packaging, Transportation and Storage
Manufacturing Quality Assurance and Reliability Index
Appendix A (Standard Appendix B (Appendix to the Standard)
Appendix C (Appendix to the Suggestive)
Appendix D (Appendix to the Suggestive)
Appendix E (Appendix to the Suggestive)
Carrying capacity and selection of reducers
Regulations on medium-hardened gear reducers
Load classification of working machinery
Actual transmission ratio of reducers
Moment of inertia of reducers
JB/T9002-1999
This standard is a revision of ZBJ1902690 "Reducers for Transport Machinery". During the revision, the original standard was edited and the main technical content remained unchanged
This standard replaces ZBJ19
902690 from the date of implementation.
Appendix A and Appendix B of this standard are standard appendices, and Appendix C, Appendix D and Appendix E of this standard are all suggestive appendices. This standard is proposed and managed by Beijing Hoisting and Conveying Machinery Research Institute. The drafting unit of this standard: Beijing Hoisting and Conveying Machinery Research Institute. The main drafters of this standard: Xu Jirong, Ma Hengyang, Gu Jiuqing, Tong Jiayan, Zhao Chunhui. I
1 Scope
Machinery Industry Standard of the People's Republic of China
Reducers for Transportation Machinery
Gearboxes for transportation machineryJB/T9002-1999
Replaces ZBJ19026-90
This standard specifies the type, size, basic parameters, technical requirements, test methods and inspection rules of reducers for transportation machinery (hereinafter referred to as reducers).
This standard applies to DBY type two-stage transmission and DCY type three-stage transmission conical cylindrical gear reducers. DBY and DCY reducers are mainly used in transportation machinery, and can also be used in various general machinery such as metallurgy, mining, chemical industry, coal, building materials, light industry, petroleum, etc. Their working conditions should meet the following requirements:
a) The maximum speed of the input shaft is not more than 1500r/min; b) The peripheral speed of the gear is not more than 20m/s
c) The working environment temperature is -40~+45℃. When the ambient temperature is below 0℃, the lubricating oil should be heated before starting. 2 Reference 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 version of the following standards. GB/T1356—1988
GB/T1569—1990
GB/T3098.1—1982
GB/T3323—1987
GB/T5903—1995
GB/T 6404—1986
GB/T9439—1988
GB/T10095—1988
JB/T9050.3—1999
3 Types and dimensions
3.1 Types
Basic tooth profile of involute cylindrical gears
Cylindrical shaft extension
Mechanical properties of fastenersBolts, screws and studsSteel fusion-welded butt jointsRadiography and quality gradingIndustrial closed gear oils
Method for determination of sound power level of gear unit noiseGrey cast iron parts
Precision of involute cylindrical gears
Loading test method for circular gear reducers
Type DBY is a two-stage transmission hardened gear reducer; type DCY is a three-stage transmission hardened gear reducer. The first stage transmission of DBY and DCY reducers is bevel gear, and the second and third stage transmission is involute cylindrical helical gear. Reducers can be divided into four assembly types according to the output shaft form: I, II, I, and IV. According to the rotation direction, they can be divided into two directions: clockwise (S) and counterclockwise (N), see Figure 1 and Figure 2.
Approved by the State Machinery Industry Bureau on June 28, 1999 and implemented on January 1, 2000
3.2 Overall dimensions
JB/T9002—1999
Assembly type of DBY reducer
Figure 2Assembly type of DCY reducer
3.2.1 The overall dimensions of DBY reducers shall comply with the provisions of Figure 3 and Table 1. 3.2.2 The overall dimensions of DCY reducers shall comply with the provisions of Figure 4 and Table 2. Figure 3
Nominal center distance a
Nominal center distance a
JB/T9002—1999
Nominal center distance a
Nominal center distance a
JB/T9002—1999
JB/T9002—1999
3.3 The shaft extension dimensions of the input shaft, output shaft and gear shaft of the reducer shall comply with the provisions of GB/T1569. 3.4 Model and marking
Input shaft rotation direction code
Assembly type code
Nominal transmission ratio
Nominal center distance a, mm
Type code
Marking example:wwW.bzxz.Net
The nominal center distance is 280mm, the nominal transmission ratio is 31.5, the assembly type is Type III, and the input shaft rotates in the clockwise direction. The marking of the three-stage transmission reducer is:
Reducer DCY280-31.5-IⅢISJB/T9002-—19994 Basic parameters and load-bearing capacity
4.1 Center distance
4.1.1The center distance of DBY type reducer shall comply with the provisions of Table 3, and the center distance of DCY type reducer shall comply with the provisions of Table 4. Table 3
Nominal center distance a
Final center distance
Nominal center distance α
Intermediate center distance
Final center distance
4.2 Nominal transmission ratio
4.2.1 The nominal transmission ratio of the reducer shall comply with the provisions of Table 5. 315
Nominal transmission ratio
DBY type
JB/T9002—1999
DCY type
The relative error between the actual transmission ratio and the nominal transmission ratio of the reducer: DBY type reducer is not more than 4%, DCY type reducer is not more than 5%
4.3 Gear module
4.3.1 The module m of the large end of the bevel gear is 3~15mm. The module m of cylindrical gears is 2.5, 2.75, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 4.3.2
22, 25 mm.
4.4 Basic tooth shape of gears
4.4.1 Bevel gears are Gleason arc teeth or Klingenberg extended epicycloidal teeth, and the tooth shape parameters shall comply with the provisions of Table 6. Table 6
Tooth profile angle
Tooth top height coefficient
Top clearance coefficient
Tooth width center helix angle
Gleason tooth profile
Arctic bevel gear
α=20°
pm=35°
The basic tooth profile of cylindrical gears shall comply with the provisions of GB/T1356 4.4.2
4.5 The load capacity and selection of reducers shall comply with the provisions of Appendix A (Appendix to the standard). 5 Technical requirements
5.1 Body and cover
Klingenberg tooth profile
Extended epicycloidal gear
α=20%
Bm=30°
5.1.1 The body and cover cast iron parts shall comply with HT200 in GB/T9439. Welded engine bodies and engine covers are allowed, and the weld seams of welded parts shall meet the requirements of Class I weld seams in GBT3323. 5.1.2 After the engine body and engine cover are assembled, the engine cover flange is allowed to be wider than the engine body flange, and the width of each side shall comply with the requirements of Table 7 Table 7
Nominal center distance a
≤280
Engineering cover flange width
5.1.3 When the engine body and engine cover are freely combined, the separation surface shall be tightly fitted, with 0.0.5mm feeler gauge to check the gap, the feeler gauge insertion depth should not exceed 1/3 of the width of the separation surface.
5.1.4 The body and cover should eliminate internal stress. 5.1.5 After finishing the separation surface, the flatness is 7-level accuracy, and the surface roughness R is 3.2um. 6
JB/T9002—1999
5.1.6 The bearing hole size tolerance zone is H7, and the surface roughness R is 3.2um. 5.1.7 The cylindricality of the bearing hole is 7-level accuracy 5.1.8 The perpendicularity between the cylindrical surface of the bearing hole and its end face is 7-level accuracy 5.1.9 The center distance limit deviation of the bearing hole shall meet the requirements of Table 8. Table 8 | | tt | 630~800
5 .1.10 The parallelism tolerance of the center line of the bearing hole is measured on the bearing span. In the horizontal and vertical directions, f and f should comply with the provisions of Table 9. Table 9
Bearing span
Parallelism tolerance, for
>125~280
>280~560
1 The center line of the bearing hole of the engine body and the engine cover shall coincide with the separation surface, and the deviation shall not exceed 0.3mm. 5.1.11
5.1.12 The engine body shall not be allowed to leak oil.
>560~1000
5.1.13 The verticality tolerance of the axes of the two vertical holes of the engine body is 8, measured at the distance from the end face of the engine body hole to the intersection of the two axes, see Figure 5, and its value is calculated according to formula (1).
Romcoso,
In the formula: 8-
JB/T9002—1999
-Perpendicularity tolerance of the axes of the two vertical holes of the machine body, μm; Limit deviation of the intersection angle of the gear countershaft, see Table 10: -The measuring distance from the end face of the machine body hole to the intersection of the two axes, mm: -Center cone distance, mm;
Pinion cone angle, (°).
Pinion cone angle
>15~25
Deviation code
5.2 Gears, gear shafts and axles
>50-100
>100~200
>200~400
>400~800
>800~1600
5.2.1 Gears and gear shafts are forged parts, the material is 20CrMnMo, the mechanical properties should meet the requirements of Table 11, and forged materials with equivalent or higher mechanical properties are allowed. Cast gears are not allowed. After carburizing and quenching gear tooth surface finishing, the effective hardened layer depth is 0.15~0.25m, the smaller value is taken for larger modulus and the larger value is taken for smaller modulus. And the tooth surface shall not have defects such as cracks and burns. The material of the output shaft is 42CrMo, and the mechanical properties shall comply with the provisions of Table 11. Materials with equivalent or higher mechanical properties are allowed. Table 11
Material grade
20CrMnMo
42CrMo
Heat treatment
Carburizing, quenching,
Double quenching,
Section size
≤100
Mechanical properties
N·m/cm2
1) Gear core hardness: The hardness at the intersection of the center line of the gear tooth and the root circle on the normal section in the middle of the tooth width. 5.2.2 Carburized and quenched gear tooth surface hardness: The gear shaft is 58~62HRC, and the gear is 54~58HRC. Hard
Tooth surface core\》
5.2.3 The size tolerance zone of the gear reference hole and the shape and position tolerance and surface roughness of the reference hole and the reference end face of the gear shall comply with the provisions of Table 12.
Gear reference hole
Gear reference end face
Size tolerance zone
Cylindricity
End face runout
Surface roughness Ra
The size tolerance zone, shape and position tolerance and surface roughness of the reference journal and shoulder of the gear shaft or the shaft and bearing shall comply with the provisions of 5.2.41
in Table 13.
Reference shaft journal
Shaft shoulder end face
Dimension tolerance zone
JB/T9002—1999
Cylindricity
End face runout
The dimension tolerance zone, form and position tolerance and surface roughness of gear shaft and shaft shall conform to the provisions of Table 14 5.2.5
Shaft extension diameter
>30~50
Shaft extension shoulder
Dimension tolerance zone
Cylindricity
Coaxiality with bearing shaft journal
End face runout
Surface roughness R
Surface roughness R.
For the fit between gear and shaft, H7/p6 shall be adopted when the nominal diameter is 50~80mm, and H7/s6 shall be adopted when the nominal diameter is greater than 80mm. The shape and position tolerances and surface roughness of the journal and shoulder at the joint between the shaft and the gear shall comply with the provisions of Table 15. Table 15
Journal fitting with gear
Shoulder fitting with gear
Cylindricity
Coaxiality with axis
End face runout
The machining dimension tolerance zone, shape and position tolerance and surface roughness of the keyway shall comply with the provisions of Table 16. Table 16
Keyway width tolerance
Symmetry of keyway
Surface roughness
Surface roughness R
5.2.8 Deviation of top circle diameter of cylindrical gear: When the tooth top circle is used as the measurement and positioning reference, its deviation shall comply with the provisions of Table 17. It is allowed to machine a 20~30mm wide positioning surface on both ends of the top cylinder. The radial runout tolerance shall comply with the provisions of Table 18, and the surface roughness R is 1.6μm.
When the top circle is not used as the basis for measuring tooth thickness, the dimensional deviation is IT11, but not more than 0.1mg. Table 17
Gear top circle diameter
Gear top circle diameter deviation
Gear pitch circle diameter
≤125
>125~400
>400~800
>800~16002 Gears, gear shafts and shafts
>50-100
>100~200
>200~400
>400~800
>800~1600
5.2.1 Gears and gear shafts are forged parts, the material is 20CrMnMo, the mechanical properties shall comply with the provisions of Table 11, and forged materials with equivalent or higher mechanical properties are allowed. Cast gears are not allowed. After carburizing and quenching, the effective hardened layer depth is 0.15~0.25m. The smaller value is used for larger modulus and the larger value is used for smaller modulus. There shall be no defects such as cracks and burns on the tooth surface. The material of the output shaft is 42CrMo, the mechanical properties shall comply with the provisions of Table 11, and materials with equivalent or higher mechanical properties are allowed. Table 11
Material brand
20CrMnMo
42CrMo
Heat treatment
Carburizing, quenching,
Double quenching,
Section size
≤100
Mechanical properties
N·m/cm2
1) Gear core hardness: The hardness at the intersection of the center line of the gear tooth and the root circle on the normal section in the middle of the tooth width. 5.2.2 Carburized and quenched gear tooth surface hardness: 58~62HRC for the gear shaft and 54~58HRC for the gear. Hard
Tooth surface core\》
5.2.3 The tolerance zone of the gear reference hole size and the shape and position tolerance and surface roughness of the reference hole and the reference end face of the gear shall comply with the provisions of Table 12.
Gear reference hole
Gear reference end face
Dimension tolerance zone
Cylindricity
End face runout
Surface roughness Ra
The shape and position tolerances and surface roughness of the reference journal and shoulder dimension tolerance zone of the gear shaft or the shaft and bearing fitting shall comply with the provisions of 5.2.41
in Table 13.
Reference shaft journal
Shaft shoulder end face
Dimension tolerance zone
JB/T9002—1999
Cylindricity
End face runout
The dimension tolerance zone, form and position tolerance and surface roughness of gear shaft and shaft shall conform to the provisions of Table 14 5.2.5
Shaft extension diameter
>30~50
Shaft extension shoulder
Dimension tolerance zone
Cylindricity
Coaxiality with bearing shaft journal
End face runout
Surface roughness R
Surface roughness R.
For the fit between gear and shaft, H7/p6 shall be adopted when the nominal diameter is 50~80mm, and H7/s6 shall be adopted when the nominal diameter is greater than 80mm. The shape and position tolerances and surface roughness of the journal and shoulder at the joint between the shaft and the gear shall comply with the provisions of Table 15. Table 15
Journal fitting with gear
Shoulder fitting with gear
Cylindricity
Coaxiality with axis
End face runout
The machining dimension tolerance zone, shape and position tolerance and surface roughness of the keyway shall comply with the provisions of Table 16. Table 16
Keyway width tolerance
Symmetry of keyway
Surface roughness
Surface roughness R
5.2.8 Deviation of top circle diameter of cylindrical gear: When the tooth top circle is used as the measurement and positioning reference, its deviation shall comply with the provisions of Table 17. It is allowed to machine a 20~30mm wide positioning surface on both ends of the top cylinder. The radial runout tolerance shall comply with the provisions of Table 18, and the surface roughness R is 1.6μm.
When the top circle is not used as the basis for measuring tooth thickness, the dimensional deviation is IT11, but not more than 0.1mg. Table 17
Gear top circle diameter
Gear top circle diameter deviation
Gear pitch circle diameter
≤125
>125~400
>400~800
>800~16002 Gears, gear shafts and shafts
>50-100
>100~200
>200~400
>400~800
>800~1600
5.2.1 Gears and gear shafts are forged parts, the material is 20CrMnMo, the mechanical properties shall comply with the provisions of Table 11, and forged materials with equivalent or higher mechanical properties are allowed. Cast gears are not allowed. After carburizing and quenching, the effective hardened layer depth is 0.15~0.25m. The smaller value is used for larger modulus and the larger value is used for smaller modulus. There shall be no defects such as cracks and burns on the tooth surface. The material of the output shaft is 42CrMo, the mechanical properties shall comply with the provisions of Table 11, and materials with equivalent or higher mechanical properties are allowed. Table 11
Material brand
20CrMnMo
42CrMo
Heat treatment
Carburizing, quenching,
Double quenching,
Section size
≤100
Mechanical properties
N·m/cm2
1) Gear core hardness: The hardness at the intersection of the center line of the gear tooth and the root circle on the normal section in the middle of the tooth width. 5.2.2 Carburized and quenched gear tooth surface hardness: 58~62HRC for the gear shaft and 54~58HRC for the gear. Hard
Tooth surface core\》
5.2.3 The tolerance zone of the gear reference hole size and the shape and position tolerance and surface roughness of the reference hole and the reference end face of the gear shall comply with the provisions of Table 12.
Gear reference hole
Gear reference end face
Dimension tolerance zone
Cylindricity
End face runout
Surface roughness Ra
The shape and position tolerances and surface roughness of the reference journal and shoulder dimension tolerance zone of the gear shaft or the shaft and bearing fitting shall comply with the provisions of 5.2.41
in Table 13.
Reference shaft journal
Shaft shoulder end face
Dimension tolerance zone
JB/T9002—1999
Cylindricity
End face runout
The dimension tolerance zone, form and position tolerance and surface roughness of gear shaft and shaft shall conform to the provisions of Table 14 5.2.5
Shaft extension diameter
>30~50
Shaft extension shoulder
Dimension tolerance zone
Cylindricity
Coaxiality with bearing shaft journal
End face runout
Surface roughness R
Surface roughness R.
For the fit between gear and shaft, H7/p6 shall be adopted when the nominal diameter is 50~80mm, and H7/s6 shall be adopted when the nominal diameter is greater than 80mm. The shape and position tolerances and surface roughness of the journal and shoulder at the joint between the shaft and the gear shall comply with the provisions of Table 15. Table 15
Journal fitting with gear
Shoulder fitting with gear
Cylindricity
Coaxiality with axis
End face runout
The machining dimension tolerance zone, shape and position tolerance and surface roughness of the keyway shall comply with the provisions of Table 16. Table 16
Keyway width tolerance
Symmetry of keyway
Surface roughness
Surface roughness R
5.2.8 Deviation of top circle diameter of cylindrical gear: When the tooth top circle is used as the measurement and positioning reference, its deviation shall comply with the provisions of Table 17. It is allowed to machine a 20~30mm wide positioning surface on both ends of the top cylinder. The radial runout tolerance shall comply with the provisions of Table 18, and the surface roughness R is 1.6μm.
When the top circle is not used as the basis for measuring tooth thickness, the dimensional deviation is IT11, but not more than 0.1mg. Table 17
Gear top circle diameter
Gear top circle diameter deviation
Gear pitch circle diameter
≤125
>125~400
>400~800
>800~1600
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