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Machinery Industry Standard of the People's Republic of China
JB/T7668-95
Multi-disc continuously variable transmission
Published on June 16, 1995
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1996
Machinery Industry Standard of the People's Republic of China
Multi-disc continuously variable transmission
" Subject content and scope of application
JB/T 7668-95
This standard specifies the model and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of multi-disc continuously variable transmissions.
This standard applies to multi-disc continuously variable transmissions with one and two speed stages (hereinafter referred to as transmissions). 2 Reference standards
GB2828
GB6388
GB10095
GB/T 7346
GB/T 13306
GB/T13385
Packaging, storage and transportation pictorial signs
Batch-by-batch inspection, counting sampling procedures and sampling tables (applicable to inspection of continuous batches) Transport packaging, receiving and shipping signs
Involute cylindrical gear accuracy
Mechanical continuously variable transmission test methods
General technical conditions for packaging of electromechanical products
3 Models and basic parameters
3.1 Model
The model consists of product code, machine model, speed level, mechanical characteristics, installation type, input power, etc. 3.1.1 Product code
The product code of the transmission is represented by the Chinese phonetic letter \P\. 3.1.2 Engine Model
The engine model of the first-stage transmission is indicated by Arabic numerals 1, 2, 3, 4, 5, 6, 7, 8: the engine model of the second-stage transmission is indicated by Arabic numerals 1, 2, 3. Speed Shift
The first-stage transmission is not indicated:
The second-stage transmission is indicated by \S\.
Mechanical Characteristics
The first-stage transmission constant power type is indicated by "G", and the constant torque type is not indicated; the second-stage transmission mechanical characteristics are between constant power and constant torque and are not indicated. Installation Type
-Indicates dual-shaft type, horizontal installation:
Indicates direct-connected type with motor, horizontal installation: Indicates direct-connected type with motor, vertical installation. 3.1.6 Marking method
Approved by the Ministry of Machinery Industry on June 16, 1995
Implemented on July 1, 1996
Marking example
JB/T7668-95
Input power (constant torque type is input power at high speed), kW Installation type
Mechanical characteristics
Number of speed stages
Machine model
Product code
Model 3, one-stage transmission, direct-connected electric motor, constant power type, input power 2.2kW, vertical installation, marked as: P3GLD-2.2JB/T 7668
Model 5, one-stage transmission, input power 7.5kW, constant torque type, double-shaft horizontal installation, marked as: P5W-7.5JB/T7668
Model 2, two-stage transmission, motor direct-connected type, input power 1.5kW horizontal installation, marked as: P2SWD-1.5JB/T7668
3.2 Basic parameters
The basic parameters of the one-stage constant power and constant torque transmissions are shown in Table 1 and Table 2 respectively. 3.2.1
Machine model
The basic parameters of the two-stage transmission are shown in Table 3.
Table 1 Basic parameters of constant power transmission
Input power
Input speed
Speed ratio
0.23~0.76
0. 2~0. 8
0. 2~0. 8
0.28~1.12
0.27~1.08
0.31~1.24
Speed regulation range
Output speed
3001200
345~1140
300~1200
3001200
300~1200
280~1120
270~1080
232~928
Output torquebzxz.net
1. 3~4. 8
14.5~54.5
24.4~91.8
36.3~136.0
49.5~186.0
77. 8~290. 0
110.0~414.0
161.0~607.0
313.0~1186.0
470.0~1764.0
Machine No.
Machine Model
Input Power
Input Power
Installation, Connection and Dimensions
JB/T 7668-95
Basic parameters of constant torque transmission
Input speed
Input speed
0. 23~0. 76
0. 2~0. 8
0.28~1.12
0.27~1.08
0.31~1.24
Speed regulation range
Basic parameters of two-stage transmission
0.06~0.72
0. 06~0. 72
-speed transmission installation, connection and overall dimensions: speed regulation model
Horizontal dual-shaft transmission installation, connection and overall dimensions, see Figure 1 and Table 4; output speed
300~1200
345~1140
300~1200
300~1200
300~1200||tt ||280~1120
270~1080
232~928
Output speed
105~1050
90~1080
90~1080
For the installation, connection and overall dimensions of the direct-connected transmission for horizontal motors, see Figure 2 and Table 5; output torque
10.6~15. 6
14.8~35.7
24.9~52.5
37.1~88.2
50.6~131.0
74.4~179.0
107.8~281.0
165.4~397.0
225 .0~583.0
323.0~679.0
480.0~1142.0
655.0~1695.0
Output short
2.9~10. 4
10.8~60.4
15.8~88.7
26.8~152.8
39.8~209.0
For the installation, connection and dimensions of the direct-connected transmission for vertical motors of types 1 to 3 and 4 to 7, see Figure 3. Figure 4 and Table 5 for the installation, connection and dimensions of the two-stage transmission. 3
JB/T7668-95
Figure 1 Horizontal double Axle-type transmission
Table 4 Installation, connection and overall dimensions of horizontal dual-shaft transmission Connection dimensions of components
Figure 2 Horizontal motor direct-connected transmission
Input power
JB/T7668-95
Table 5 Installation, connection and overall dimensions of horizontal motor direct-connected transmission Installation
Note, when the input power ≥11kW,
Exhaust connection dimensions
Generally, the motor direct connection type is not adopted.
Figure 31~3 type vertical motor direct-coupled transmission Figure 44~7 type vertical motor direct-coupled transmission external
machine model
input power
JB/T 7668-95
installation, connection and external dimensions of vertical motor direct-coupled transmission d
Note: When using the II structure type motor, its L value should be the value listed in the table plus the motor cover height. Figure 5 two-stage transmission
input power
5 technical requirements
5.1 working conditions
JB/T7668-95
installation, connection and external dimensions of two-stage transmission 4
shaft extension connection size
5.1.1 the working environment temperature of the transmission is -10 to +40℃. 90
5.1.2 Under rated load speed, the oil pool temperature rise shall not exceed 45°C, the maximum oil temperature shall not exceed 85°C for double-shaft type and 80°C for motor direct-connected type. If necessary, a heat exchanger may be installed. 5.2 Assembly requirements
The distribution position and size of the contact spots of each gear pair shall comply with the provisions of GB10095. The friction disc installed on each spline shaft must slide freely. The transmission shall not have oil leakage.
There shall be no abnormal sound when the friction discs contact each other. During operation, manual speed adjustment shall be flexible and stable, and all connectors and fasteners shall not be loose. The non-machined inner surface of the casting shall be coated with oil-resistant paint, and the non-machined outer surface shall be purified, primed and painted. 5.3 Performance requirements
5.3.1 At the rated input speed when no-load, the minimum output speed error is ±3r/min and the maximum speed error is ±6r/min. 5.3.2 Mechanical efficiency
When the transmission is running at low speed and full load, its mechanical efficiency shall not be less than the value specified in Table 8. 5.3.3 Slip rate
When the transmission is running at low speed and full load, its slip rate shall not be greater than the value specified in Table 8. Table 8 Mechanical efficiency and slip rate of transmission
Product model
Electric efficiency
Actuation rate
5.3.4 Noise
Constant power type
Stage converter
Constant speed type
Two-stage transmission
When the dual-shaft transmission is unloaded, the A-weighted sound power level measured within the speed regulation range shall not be greater than the value specified in Table 9. %
Machine number
Noise sound power level
JB/T 7668-95
Noise index of transmission
Two-stage transmission
Note: The noise power level of direct-connected transmission is calculated by the synthesis method of sound level (energy addition method), that is, the noise power level of the dual-shaft transmission is superimposed with the noise power level specified in the instructions for use of the motor (standard or sample). The temperature rise shall comply with the provisions of Article 5.1.2.
5.3.6 Cleanliness
The cleanliness of the transmission cavity shall not exceed the specified value in Table 10. Table 10
Machine model
Impurity weight
Machine model
Impurity weight
5.3.7 Lubricating oil
Transmission Cleanliness of inner cavity
The lubricating oil of the transmission shall be selected according to the provisions of Table 11. The corresponding oil grade 1080
,
Table 11 Lubricating oil of the transmission
Environmental humidity C
Viscosity (98.9C) mm/s
Other main performance parameters shall comply with the specified values of Table 1, Table 2 and Table 3. 5.3.8
Test method
The test method shall comply with the provisions of JB/T7346. 7 Inspection rules
The product shall be inspected and qualified by the quality inspection department of the manufacturer before it can leave the factory, and it shall be accompanied by a product certificate. 7.2 Product inspection is divided into factory inspection and type inspection. 7.2.1 Factory inspection
7. 2. 1. 1
7. 2. 1. 2
7. 2. 1. 4
Before the product leaves the factory, each unit shall be subjected to a no-load test and shall comply with the no-load test requirements in JB/T7346. When running at no-load, the oil temperature rise shall be 5°C lower than the value specified in Article 5.1.2. The output speed range shall be consistent with the nameplate. The appearance of the transmission shall be neat, the coating shall be evenly smooth, and the nameplate shall be correct. 7.2.2 Type inspection
7. 2. 2. 1
7. 2. 2. 2
7. 2. 2. 3
The samples for type inspection are selected from the samples that have passed the factory inspection according to the provisions of GB2828. The type inspection is carried out in accordance with the content of JB/T7346. If there is one item that fails in the inspection, double sampling should be carried out to re-inspect the unqualified items. If the re-inspection fails, the batch of products will be judged as unqualified.
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