JB/T 8905.2-1999 JB/T 8905.2-1999 Bottom-mounted reducer for crane JB/T8905.2-1999 Standard download decompression password: www.bzxz.net

JCS 21.120.20
Machinery Industry Standard of the People's Republic of China
JB/18905.2-1999
Foot mounted gearboxes for cranes
Published on 1999-06-28
State Machinery Industry Bureau
2000-01-01 implementation
JBT 8905.2-1999
2 References
4 Basic parameters and dimensions
5 Reduction requirements
6 Test piece method
7 Inspection rules
B Marking, packaging, transportation, storage
Appendix A (Appendix to the standard) Noise limit for reducers with a center moment greater than 500mm Appendix A (Appendix to the standard) Specification for selection of base-type reducers for machine 2
JB/T8905.2—1999||t This standard is a revision of ZBJ19011.S8. This standard has some important technical changes from the revised standard in the following aspects: 1. The gear ratio of the original 7-level gear ratio is changed to 9-8-7. 2. The actual transmission ratio of the reducer is supplemented. This standard is part of the series of standards for reducers for cranes. This series of standards includes: Three-point reducers for cranes
JB/T8905.1--1999
9 Base-type reducers for cranes
JB/T 8905.2-1999
JB/T8995.3-1999 Vertical reducer for crane JB/T8995.4-1999 Enclosed reducer for crane This standard will replace BJ19011-1999 from the date of implementation. Appendix A and Appendix B of this standard are the appendixes of the standard. This standard is proposed and managed by the National Technical Committee for Standardization of Cranes. Drafting unit of this standard: Beijing Machinery Research Institute of the Ministry of Machinery Industry The main authors of this standard: Zhao Kede, Li. 1 Scope
Machinery Industry Standard of the People's Republic of China
Foot maunted gtarbores for cranes
Foot maunted gtarbores for cranes cranesJB/T805.2—1999
This standard specifies the types, parameters, dimensions and technical requirements of base-type inclined cylindrical gear reducers of three series, QJR-D, QIS-D and QJRS-D.
The reducers specified in this standard are applicable to all relevant mechanisms of cranes and can also be used in transmission mechanisms of various mechanical equipment such as transport boxes, metallurgical enterprises, mining, chemical industry and light industry. The working conditions shall meet the following requirements: a) The peripheral speed of the gear shall not exceed 16m/s:
The maximum rotation speed shall not exceed 000:
The working environment temperature shall be 40℃-+45%℃d) It can run in both forward and reverse directions.
2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard by being cited in this standard. The versions shown are valid when this standard is published. All standards are subject to revision, so parties with limited use of the standards should discuss in depth the feasibility of using the latest version of the following standards. GA191 — 1990 | | tt | GB/T 3478.1—1995
0B/T 3478.2..1995
B.T3811I983
GB/T 5903 --1995
QB.T 6404.-[986
GA/T 9439-19RX
GB/T 1009S.. [988
GB:T13306—1991
GB/TJ3384—1992
JH/T T919--.199S
Packaging, storage and transportation pictorial symbols
Surface precision and its numerical value
Key chain groove surface dimensions
Shape tolerance, non-deception tolerance
Involute gear basic ratio
Involute cylindrical gear number
Tolerance and matching dimensions to 3mm hole, shaft tolerance zone and matching circle suitable for toothed disconnected involute chain module basic tooth gallery tolerance circle note spur involute chain 30° force angle dimension table vertical machine design specification Specification
Industrial enclosed gear oil
Method for determining the output level of gear device
East China Iron Parts
Zhejiang Kaifeng Circular Gear
General technical conditions for packaging of electromechanical products
Gear transmission equipment specifications
Approved by the State Machinery Industry Bureau on 1999-06-28 and implemented on 2000-01-01
JB/T9050.3
3 Type
3.1 Structural type
JD/T 8905.2-1999
Test method for circular gear connector
QJ-D type reducer is divided into three types: R type (two-stage), S type (three-stage) and KS type (two- and three-stage combination type). 3.2 Assembly type
Assembly type long small type, see Figure 1.
Figure! Assembly type
3.3 Shaft type
The high-speed extraction end adopts a cylindrical shaft extension, flat key connection, and there are three types of output shaft ends (see Figure 2 and Table [] a) P type: cylindrical shaft extension, flat key connection: b H type: Figure shaped shaft extension: involute spline connection: ) C type: gear shaft end [Only the reducer with a nominal center distance of 23(-5(mm) has this auxiliary type] P type four-way shaft
H spline shaft
Figure 2 Output shaft end type
Upper wheel shaft
Center
3 × Is
1 ×22
5 × 22
$ × 26
57n 5 × 34
5 × 38
8 ×34
3 ×56
4 ×56
4 × 56
6 ×35
6 ×58
JB/T8905,21999
279,5 : 253
3.4 ​​Model representation method
Marking example:
JB8905.3—1999
Output ratio shaft end type
Assembly type
Nominal transmission ratio
Nominal center distance (output stage center distance)
With base
Structural type
A crane coupling
The second stage of the crane with base, nominal center distance 2.560mm, public transmission ratio 20, first assembly type, end type is P type, marked as
Coupling QJR-D560-20VPJE/TB9052—19994Basic numbers and dimensions
4, 1 Center distance
ton speed reducer takes the output stage center as the nominal center, and the total value shall comply with the provisions of Table 2. Table 2
\ (nominal center source)
Secondary total center group 4
First level total center connection 6
4.2 Transmission ratio
40c! 450
Reduction gear nominal transmission ratio and actual transmission ratio shall comply with the integral value specified in the table, and its limit deviation is: three-stage speed reducer is not more than ±4%, three-stage reducer is not more than ±5%. -1999
20:902
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4.3 Gear teeth
JB/T$905.2—1999
The gear structure of the reducer shall comply with the provisions of GB/T 1356. 4.4 Pulley module and pitch angle
The pulley module m shall comply with the provisions of GB/T 1357 (see 4). The pitch angle of the pulley is 9-13
4.5 Overall dimensions and installation dimensions
The overall dimensions and installation dimensions of the Q reducer are shown in Figure and Table 5. The overall dimensions and installation dimensions of the QJS-D reducer are shown in Figure 4 and Table 6, and the overall dimensions and installation dimensions of the QJRS- reducer are shown in Figure 5 and Table 3.5
Figure 3 Overall dimensions of QR-D reducer
JB/T 8905.2-1999
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JB990S2—1999
Figure 4 QJS-D reducer outline size
Figure 5 QJRS-D liquid connector outline size
JB/F 8905.2-1999
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