Some standard content:
GB12732 | | tt | | 2-1996 | The Automobile Association's standard JASOE107-88 "Automotive V-belt", the physical and mechanical properties of the first-class products are the same as those specified in JASOE107-88. Based on the specific conditions of the tape industry, this standard divides cloth-covered V-belts into qualified products and first-class products, respectively stipulates different bench fatigue life, and cancels its actual mileage assessment; for glass fiber cords that have a certain market in China The tension force used in the fatigue test of V-belts adopts the values ??specified in ISO5287:1985 "Fatigue Test of Narrow V-Belt Transmissions for the Automotive Industry". At the same time, only qualified products are set for this type of V-belts.
This standard will replace GB12732--91 from the date of entry into force. This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard recommendation is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by: Shanghai Adhesive Tape Co., Ltd. Shanghai Rubber Products Factory No. 2 and Qingdao Rubber Industry Research Institute. The main drafters of this standard: Lin Weisheng, Zhu Zhenqing, Chen Hemei, Han Deshen. 323
1 range
National Standard of the People's Republic of China
Automobile
Car
V
Automotive V-belts
Belts
GB 12732
1996
replaces GB12732---91
This standard specifies the classification, requirements, sampling, test methods and markings of automotive V-belt products, Packaging and storage rules. This standard applies to V-belts that drive auxiliary equipment of automobile internal combustion engines (such as fans, generators, water pumps, power steering pumps, compressors, etc.).
2 Reference standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T3686-83 Test method for full-section tensile properties of V-belts GB/T11545-1996 Fatigue test method for automotive V-belts (eqvISO5287:1985) GB/T 13352--1996
Automotive V-belt dimensions||tt| |3 Classification
3.1 Type
According to its structure, the types of automotive V-belts are divided into two types: edge-wrapped V-belts (referred to as cloth-wrapped belts) and trimmed-edge V-belts (referred to as trimmed belts) , the trimming belt is divided into three types: ordinary type, bottom rubber clip cloth type and toothed type (see Figure 1). +. || tt | ||Implemented on 1997-06-01
3.2 model
)
Trimming belt (toothed)
GB12732—1996
Trimming belt (Bottom glue clip cloth type)
d)
wrapping cloth; 2 top cloth; 3-. Top glue: 4-buffer glue; 5-tensile body; 1
6 --Bottom glue;7--Bottom fabric;8-Bottom gum cloth Figure 1 Structural type and name of each part
Automotive V-belts are divided into AV10, AV13, AV15, AV17, AV22 and other models according to the top width of the belt . 4 Requirements
4.1 Rubber
The composition of top rubber, buffer rubber and bottom rubber should be uniform, and their properties should be suitable for their respective functions. 4.2 Fabric
The wrapping cloth, top cloth, bottom cloth and bottom glue cloth are all plain cotton cloth, synthetic fiber cloth or other suitable fabrics. There should be no defects or distortions on the cloth, and its warp and weft density should be basically uniform. . 4.3 Tensile body
The tensile body should be a cord made of synthetic fiber or other suitable fibers, and its twist should be uniform. 4.4 Dimensions
The dimensions and deviations of automobile V-belts should comply with the regulations of GB/T13352. 4.5 Appearance quality
Automobile V-belts should have a symmetrical trapezoidal cross-section, and their appearance should not have any obvious defects such as distortion, cracking, bubbles, and impurities that affect use. The width of the flash on one side of the top surface shall not exceed 0.5 mm, and trimming shall not damage the inner wrapping fabric. 4.6 Properties
4.6.1 Tensile properties
The tensile strength and force elongation of automotive V-belts are shown in Table 1. Table 1 Full-section tensile strength and reference force elongation type
No.
AV10
AV13
AV15
AV17
AV22
4.6.2 High temperature resistance
Full-section tensile strength, not less than
N
2260
3140
3700|| tt||4420
7060
reference force elongation, not greater than
%
4
4
5||tt ||6
6
The high-temperature resistance of automobile V-belts is tested according to the method specified in 6.3. No cracks are allowed on the V-belts after the test. Reference force
790
1480
1800
2360
3930
327
4.6.3 Low temperature resistance performance| |tt||GB12732--1996
The low-temperature resistance of automobile V-belts is tested according to the method specified in 6.4. No cracks are allowed on the V-belts after the test. 4.6.4 Recommended fatigue life
The fatigue life requirements of automotive V-belts are shown in Table 2. Table 2 Fatigue life
Quality level
First-class product
Qualified product
Cloth tape
Not less than 55
Not less than 30
Note: The fatigue life of automobile V-belts for automobile manufacturers shall be agreed upon by both parties of supply and demand, and the minimum shall not be less than 30h5 sampling
The automobile V-belts shall be inspected by the technical inspection department of the manufacturer in accordance with this standard Carry out sampling inspection and acceptance. 5.1 Automotive V-belts should be inspected for appearance quality one by one. Trimming tape
not less than 80
not less than 55
h
5.2 Automotive V-belts will take 0.5% of each batch of products for size inspection, and use the same material, No more than 50,000 pieces of the same specification and grade are considered a batch.
5.3 Tensile property tests should be conducted at least twice a month. 5.4 High temperature resistance and low temperature resistance tests should be conducted at least once per season, and the number of samples should be no less than two. 5.5 Fatigue life test: For automobile V-belts of the same material, same model, and same grade, the test should be conducted once a quarter if the monthly output is greater than 120,000 pieces, once every six months if the monthly output is less than 120,000 pieces, and once a year if the monthly output is less than 30,000 pieces. , sampling at least one piece in each test. During the test, if one (or two) strips fail, double the number of unqualified V-belts should be taken for retesting. If one retest sample strip is still unqualified, the batch of products will be deemed unqualified. 5.6 If there are unqualified items among the test items mentioned in 5.3 to 5.4, double samples should be taken from the V-belts of the batch of automobiles and the unqualified items should be retested. If one of the test results is still unqualified, This batch of products is deemed to be defective. 5.7 Users can also conduct random inspections according to the agreement between the two parties. 6 Test method
6.1 Dimensions
The length, exposed height, and center distance variation of the automobile V-belt shall be implemented in accordance with the provisions of GB/T13352. 6.2 Tensile test
The full-section tensile property test of automotive V-belts is performed in accordance with GB/T3686. 6.3 High Temperature Test
Cut a sample of about 250mm in length from the test sample, place it at a temperature of 100±1°C and test continuously for 70+5h, then cool it at room temperature for at least 2h, and place the cooled sample in Bend the tube or rod with the diameter specified in Table 3 in the normal bending direction of the belt and observe whether cracks appear on the sample.
Table 3 Pipe Rod Diameter
Type
No.
Pipe Rod Diameter
6.4 Low Temperature Test
AV10
45
AV13
50
AV15
50
AV1?
55
mm
AV22| | tt | |GB12732—1996
Or bend the rod in the normal bending direction of the belt and observe whether cracks appear on the sample. 6.5 Fatigue life test
6.5.1 The fatigue life test is performed in accordance with GB/T11545. 6.5.2 The tension parameters of the fatigue test of qualified products of glass fiber cord V-belts are shown in Table 4. The test tension of first-class products should comply with the regulations of GB/T11545.
Table 4 Tension type of fiberglass cord belt fatigue test for qualified products
No.
Tension force, N
Transmission power, kw||tt| |AV10
360
6.0
AV13
470
7.9
Note: Glass fiber cord V-belt qualified product inspection sheet Tightening force calculation formula: F=K×P
In the formula: F
Belt tension, N;
P transmission power, kW;
K… Coefficient, for three-wheel testing machines, is 60N/kW7 Mark, Packaging and Storage
7.1 Mark
AV15
470
7.9
per A car V-belt must have obvious marks that are not easy to erase, including the following: a) specifications (marks);
b) manufacturer's trademark and name (or code); c) year and month of manufacture.
7.2 packagingbZxz.net
AV17
540
9.0
AV22
600
10.0
Car V Each belt should be packed in a paper sleeve or plastic film. Every 50 to 100 V belts of the same material, specification, grade, and model should be packed in a box. The material of the tensile body should be marked on each box. and V-belt grade, specification, quantity and other matters, the product certificate should be contained in the box.
7.3 Storage
7.3.1 During transportation and storage, automobile V-belts should be kept away from direct sunlight or rain and snow, kept clean, and prevented from being affected by acids, alkalis, oils, and organic solvents. Contact with rubber-quality materials to prevent mechanical damage and keep 1 m2 away from heating devices. 7.3.2 During storage, the warehouse temperature should be maintained between -18 and 40°C, and the relative humidity should be maintained at 50% and 80%. 7.3.3 During storage, it is necessary to avoid deforming the belt due to excessive weight. It is best to hang the belt on a crescent-shaped shelf or place it flatly on the shelf.
7.3.4 When the storage period does not exceed one year under the above conditions, its performance shall be in accordance with this standard. 329
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