JB/T 7936-1999 JB/T 7936-1999 Straight profile toroidal worm reducer JB/T7936-1999 Standard download decompression password: www.bzxz.net

ICS21.200
Mechanical Industry Standard of the People's Republic of China
JB/T7936-1999
Straight Profile Annular Worm Reducer
Hindley worm reduction units1999-06-28 Issued
State Machinery Industry Bureau
2000-01-01 Implementation
JB/T7936-1999
Cited standards
Types, basic parameters and dimensions
Technical requirements
Test methods and inspection rules
Marking, packaging, transportation and storage
Selection of reducers
Use and maintenance of reducers
Appendix A (Appendix to the standard) Load-bearing capacity and total transmission efficiency of reducersAppendix B (Appendix to the standard) Chemical composition and mechanical properties of recommended materials: Appendix C (Appendix to the suggestion) Selection of reducers·Appendix D (Appendix to the suggestion) Use and maintenance of reducers12
JB/T7936—1999
This standard is a revision of JB/T793695 "Straight Corridor Toroidal Worm Reducers". Compared with JB/T7936-95, the main technical content changes of this standard are: adding the body and cover series of reducer welded structure with center distance greater than or equal to 160mm.
This standard replaces JB/T7936-95 from the date of implementation. Appendix A and Appendix B of this standard are standard appendices. Appendix C and Appendix D of this standard are prompt appendices. This standard is proposed and managed by the Metallurgical Equipment Standardization Technical Committee. The drafting unit of this standard: First Heavy Machinery Group Corporation. The main drafters of this standard: Wen Huisheng, Jing Liuji, Liu Zhen, Liu Xinwei, Fu Wei. This standard was first issued in April 1988.
Mechanical Industry Standard of the People's Republic of China
Straight Profile Annular Worm Reducer
Hindley worm reduction unitsJB/T 7936--1999
Replaces B7936-95
This standard specifies the types and basic parameters, technical requirements, test methods and inspection rules, load capacity, selection methods, etc. of straight profile Annular Worm Reducer.
This standard is applicable to straight profile Annular Worm Reducer (hereinafter referred to as reducer) used in mechanical equipment such as metallurgy, mining, lifting, transportation, petroleum, chemical industry, and construction.
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 will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB191 — 1990 | | tt | GB/T3077——1988
GB/T 4879—1985
GB/T8002.1~8002.15—1987
GB/T9439-1988
GB/T13306-—1991
GB/T13384—1992
JB/T1265--1993
JB/T5000.3—1998
JB/T5000.4-1998
JB/T 5000.12—1998
3 Type, basic parameters and dimensions
3.1 Type
3.1.1 The angle between the worm and the worm wheel axis is 90°. 3.1.2www.bzxz.net
Worm on worm wheel
Approved by the State Bureau of Machinery Industry on June 28, 1999
Metal tension test method
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Technical conditions for cast copper alloys
Shape and position tolerances without tolerance values
Shape and position tolerance inspection regulations
Alloy structural steel Steel technical conditions
Rust-proof packaging
Chemical analysis method of tin bronze
Gray cast iron parts
General technical conditions for packaging of electromechanical products
Technical conditions for rotor bodies and main shaft forgings of 25~200MW steam turbinesGeneral technical conditions for heavy machineryWelded parts
General technical conditions for heavy machineryCasting parts
General technical conditions for heavy machineryPainting
2000-01-01 Implementation
a) HWT type -
b) HWWT type -
JB/T 7936-1999
Casting body and cover, see Figure 1.
Welding body and cover, see Figure 2.
3.1.3 Worm under worm wheel
a) HWB type -
Cast body and cover,
See Figure 3.
b) HWWB type - Welded body and cover, see Figure 4.3.1.4 There are three types of assembly for worm above worm wheel and worm below worm wheel, see Figure 5.3.2 Basic parameters
3.2.1 The speed shall not exceed 1500r/min.
The sliding speed of the intermediate plane indexing circle of the worm shall not exceed 16m/s. 3.2.2
The worm shaft can run in forward and reverse directions.
The working environment temperature of the reducer is -40~+40℃. When the working environment temperature is lower than 0C, the lubricating oil must be heated to above 03.2.4
℃ before starting or use lubricating oil with low freezing point; when it is higher than 40℃, cooling measures must be taken. 3.2.5
The load-bearing capacity and total transmission efficiency of the reducer are shown in Appendix A (Standard Appendix). The center distance a of the reducer is shown in Table 1.
Table 1 Center distance a
First series
Second series
Note: The first series should be used first.
The nominal transmission ratio 1 of the reducer is shown in Table 2.
First series
Second series
First series
Second series
Note: The first series should be used first.
Table 2 Nominal transmission ratio 1
The intermediate plane pitch circle diameter d of the worm, the forming circle diameter d and the worm wheel tooth width b are shown in Table 3. Table 3
Graduation diameter d, forming circle diameter d and worm gear tooth width b, 100
JB/T7936-
HWT type
Figure 2HWWT type
JB/T7936—1999
HWB type
HWWB type
Figure 5 Assembly type
3.3 Model and marking example
3.3.1 Model
3.3.2 Marking example
JB/T7936-1999
Assembly type code
Nominal transmission ratio
Center distance
Worm position, T is upper, B is lower
Body and cover, W is welded Connected structure, not marked as cast structure Straight toroidal worm reducer
Example 1 Center distance 250mm, nominal transmission ratio 20, the first assembly type, worm on top, body and cover of cast structure Straight profile toroidal worm reducer:
Reducer HWT250-20-1JB/T7936-1999 Example 2 Center distance 250mm, nominal transmission ratio 20, the first assembly type, worm down, body and cover of welded structure Straight profile toroidal worm reducer:
Reducer HWWB250-20-1JB/T7936-1999 3.4 Dimensions
3.4.1 The main dimensions of HWT reducer are shown in Table 4, and the main dimensions of HWWT reducer are shown in Table 5. 3.4.The main dimensions of 2HWB type reducer are shown in Table 6, and the main dimensions of HWWB type reducer are shown in Table 7. Table 4
HWT100
HWT125
HWT160
HWT200
HWT250
HWT280
HWT315
HWT355
HWT400
HWT450
HWT500
HWT reducer size
HWT100
HWT125
HWT160
HWT200
HWT250
HWT280
HWT315
HWT355
HWT400
HWT450
HWT50 0 | | tt | | HWWT160 | |tt||HWW T200
HWWT250
HWWT280
HWWT315
HWWT355
HWWT400
HWWT450
HWWT500
JB/T7936—1999
Table 4 (end)
HWWT type reducer dimensions
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