This standard specifies the structural type, model, basic parameters, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of push rod reducers. This standard is applicable to metallurgy, chemical industry, lifting and transportation, machine tools, agricultural machinery, light industry, textiles, construction and other industries. This standard is applicable to reducers with power of 30kW and below. The maximum input speed is 3000r/min. JB/T 7342-1994 Push rod reducer JB/T7342-1994 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7342--94
Push rod reducer
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Push rod reducer
1 Subject content and scope of applicationbzxz.net
JB/T7342-94
This standard specifies the structural type, model, basic parameters, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of push rod reducers (hereinafter referred to as reducers). This standard is applicable to metallurgy, chemical industry, lifting and transportation, machine tools, agricultural machinery, light industry, textiles, construction and other industries. This standard is applicable to reducers with power of 30kW and below. The maximum input speed is 3000r/min. 2 Reference standards
GB1096
GB1569
QB gasoline engine lubricating oil
Ordinary flat key type size
Cylindrical shaft extension
GB10069.3
Determination method and limit of noise of rotating electrical machine
Noise limit
GB11368
GB12217
Cleanliness of gear transmission device
Machine shaft height
3 Structural type Type, model, basic parameters and main dimensions 3.1 Structural type
The transmission component of the reducer is the TB variable speed transmission bearing. According to different usage requirements, there are the following types: TW reducer is a double-shaft type, the base has a foot, and is installed horizontally; TL reducer is a double-shaft type, the base has a flange, is installed vertically, and the output shaft is vertically downward: TWY reducer is an asynchronous motor direct-connected type, the base has a foot, and is installed horizontally; TLY reducer is an asynchronous motor direct-connected type, the base has a flange, is installed vertically, and the output shaft is vertically downward. 3.2 Model
The reducer model consists of the type code, machine model, motor power and transmission ratio. The marking method is: 0-0-0
Transmission ratio
Motor power (double-shaft type is input power), kw machine model
Reducer type code, the representation method is the same as 3.1 marking example:
Double-shaft type machine base with bottom foot horizontal installation push rod reducer, machine model No. 2, input power 3kW transmission ratio 16: TW2-3-16JB/T7342-94
Asynchronous motor direct-connected machine base with flange vertical installation push rod reducer, machine model No. 4 motor power 7.5kW, transmission ratio 24: TLY4-7.5-24JB/T 7342-94
Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
3.3 Basic parameters and main dimensions
JB/T7342-94
Specification codes of speed transmission bearings used in reducers are shown in Table 1. Table 1
Reducer model
Specification codes of speed transmission shaft domain
Rated input power of reducers is shown in Table 2.
Machine model
Transmission ratio
The maximum allowable output torque of reducers at the maximum input speed (1500r/min) is shown in Table 3. Installation, connection and overall dimensions of reducer
The installation, connection and overall dimensions of single-stage horizontal reducer (including motor direct-connected type) are shown in Figure 1 and Table 4, and the installation, connection and overall dimensions of single-stage vertical reducer (including motor direct-connected type) are shown in Figure 2 and Table 5.5
Machine model
Transmission ratio
JB/T 7342-94
JB/T 734294
Add motor quantity
According to motor
Solution
FF-00s
19-902
51-09T
19-261
Installation screw machine
3.3.5The quality indicators of reducer are shown in Table 6.
JB/T7342-94
Shaft extension connection size
Output shaft
Shaft-in-shaft
Outer dimensions
TLY type
Longsheng commercial vehicle grade
Inner face cleanliness
Full load efficiency
TWou~TWo3
TWG~TW\
TW3~TW6
TW00~TW03
TW04~TW2
TW3~-TW6
Sealing requirements
Technical requirements
JB/T7342
>21. 50 ~43. 0u
>43. 00 ~-75. 00
>75.00 ~132. 00
Oil leakage is not allowed. Oil seepage ≤1 drop/6min
The reducer shall comply with the requirements of this standard and be produced in accordance with the national product samples and technical documents approved through the prescribed procedures. 4. 1
4.2 Variable speed transmission bearings: The code dimensions and connection dimensions are shown in Table A1 in Appendix A (Supplement). 4.2.1·The precision requirements for variable speed transmission bearings are shown in Table 7. Table 7
Dimension tolerance
Maximum allowable value R,
Inner diameter keyway width
Outer diameter keyway width
Connection pin hole
Connection pin center circumference and degree
Deep groove ball bearings in variable speed transmission bearings. Products with tolerances above G (including G) specified in GB307.1 4.2.3
When basic variable speed transmission bearings adopt different fixing methods, they should rotate flexibly in both forward and reverse directions. They are stable and without obstruction, and there should be no impact and abnormal noise.
4.2.4A type variable speed transmission bearings adopt internal gear fixing method, and they should rotate flexibly in both forward and reverse directions, and they are stable and without obstruction. There should be no impact and abnormal noise.
4.2.5 Variable speed transmission bearings should be riveted reliably, and the transmission pins and transmission rings should adopt interference fit, and all connecting parts and fasteners should not be loose. 4.3 The working environment temperature of the double-shaft reducer is -40~+40C. Under rated load and rated speed, the oil pool temperature rise of the reducer shall not exceed 45C, and the maximum oil temperature shall not exceed 85C. The rated voltage of the power supply of the motor direct-connected reducer is 380V. The rated frequency is 50Hz. When the sea level does not exceed 1000m, the allowable working environment temperature is -10~+1040. When the sea level is 1000~2000m, the allowable working environment temperature is -10~=35℃. 6
JB/T7342-94
Under rated load and rated speed, the oil pool temperature rise of the reducer in the above two working situations shall not exceed 45C. The maximum oil temperature shall not exceed 85 and 80 respectively.
4.4 The reducer can be operated in both forward and reverse directions. The performance should meet the requirements of Table 6. 4.5 The shaft extension of the reducer is cylindrical, and adopts A-type key connection + and meets the requirements of GB1569 and GB1096. 4.6 The installation dimensions and connection dimensions without tolerances are in accordance with IT14, and the appearance dimensions without tolerances are in accordance with IT18. 4.7 There should be no looseness in the connection parts and the surrounding parts. 4.8 The operation is smooth, and there should be no impact, vibration and abnormal sound. 4.9 The appearance is neat, the coating is even and smooth, and the surface is not damaged. 5 Test methods
5.1 Test equipment and instruments
Reducer test bench;
Speed ​​torque measuring instrument torque test accuracy is not less than 2%, speed test accuracy is not less than 1%: Noise measuring instrument accuracy ±1dB(A):
Thermometer accuracy ±1℃;
Ruler accuracy ±0.5mm;
Vernier caliper accuracy ±0.02mm;
Grade scale accuracy level 1;
Height vernier caliper accuracy ±0.02mm.
5.2 No-load test
After adding HQB-15 lubricating oil as required, run no-load in the forward and reverse directions at rated input speed for no less than 0.5h each, which shall comply with the provisions of Articles 4.7 and 4.8 of this standard. 5.3 Load test and mechanical efficiency determination
5.3.1 The load test is carried out after the no-load test is passed. At the rated input speed, the load is gradually increased in four stages of 25%, 50%, 75% and 100% of the rated input power, with a loading error of 5%. The operation time of each stage is based on the stability of the lubricating oil temperature rise, but it shall not be less than 2 hours. 5.3.2 During the load test, for products that require reversing work, forward and reverse tests shall be carried out. For products that work in one direction, only one-way tests are allowed, but the direction of rotation during the test must be the same as the working direction. 5.3.3 The load test shall meet the following requirements. At the rated input speed and rated load, the oil pool temperature rise of the test device shall not exceed 45°C, the maximum temperature shall not exceed 85°C, and it shall comply with 4.7, 4.8. 5.3.4 After the temperature rise is stable, 10 sets of speed and torque data are taken continuously at the input and output ends of the reducer under test, and input into the computer at the same time to calculate the transmission efficiency. The measurement results should comply with Table 6. And verify the transmission ratio. 5.4 Temperature rise measurement
5.4.1 The temperature rise measurement is carried out after the load test is qualified. The lubricating oil is at room temperature. At the rated input speed, it is loaded to the rated load. The oil temperature is measured and recorded every 0.5h. The oil temperature is stable when the oil temperature changes by no more than 1℃ every 1h. The temperature rise test is not less than 4h. The temperature and temperature rise stabilization time are recorded.
5.4.2 When using an expansion thermometer, the method shown in Figure 3 should be adopted and carried out from the vent hole. 5.4.3 Measurement of ambient temperature
JB/T7342-94
Monitoring meter
Place the thermometer 1.5m away from the surface to be measured, and the thermometer should be at the same height as the product to be measured. The thermometer should not be affected by external heat radiation and airflow, and its reading is the ambient temperature. 5.4.4 The difference between the highest temperature of the tested product and the ambient temperature when the product is stable is the temperature rise of the tested product. The measurement results should comply with Table 6. 5.5 Noise measurement
The product noise is measured under the conditions of 5.2. The method is to use A-weighted sound power level measurement according to GB10069.3. The measurement results should comply with Table 6.
5.6 Overload test
The reducer overload test is carried out immediately after the load test. The lubricating oil is still hot. At the rated input speed, it is loaded to 160% of the rated load. The test time is not less than 2 minutes. The overload test should not cause bonding, fracture and other forms of damage. It should be able to operate normally after the test. 5.7. Determination of the cleanliness of the reducer cavity
The method for determining the cleanliness of the reducer cavity is carried out according to GB11368. The measurement results should comply with Table 6. 5.8 Check H in Table 4 and Table 5 with a ruler, height vernier caliper, vernier caliper and micrometer. The results of d1, bt, L and dz, bt, L shall comply with the provisions in the table.
5.9 Visual inspection of appearance shall comply with Article 4.9. 6 Inspection rules
6.1 Each product must be inspected according to the factory inspection items of this standard. It can only be shipped after passing the inspection and is accompanied by a product certificate. 6.2 Product inspection is divided into factory inspection and type inspection. 6.3 Factory inspection of products
Each product must undergo a no-load test, and the results shall comply with Articles 4.7 and 4.8: The sealing requirements shall comply with Table 6, the installation dimensions shall comply with Article 5.8, and the sampling items of each batch of products shall comply with Articles 5.3 to 5.5 of this standard. Each batch of products of the same model shall be sampled and inspected according to the requirements of Table 6, with a sampling inspection of 4%, and 2 units for each batch of less than 30 units. If one of the sampled products fails, the sampling shall be doubled. If there are still unqualified units, the batch shall be judged as unqualified. 6.4 Type inspection
6.4.1 The content of product type inspection includes all the test items specified in this standard. 6.4.2
Type inspection shall be carried out in any of the following cases: Finalization and appraisal of new products before production;
After production, if there are major changes in the structure, process and materials, which may affect the product performance; During normal production, an inspection shall be carried out periodically or after a certain amount of production has been accumulated; When there is a big difference between the results of the factory inspection and the results of the last type inspection; When the product is stopped for a long time and production is resumed; When the national quality supervision agency puts forward the requirement for type inspection.
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