GB/T 3579-2002 Technical requirements and test methods for bicycle chains
Some standard content:
GB/T 3579--2002
This standard is equivalent to the international standard ISO9633:1992 "Technical conditions and test methods for bicycle chains". This standard changes the tensile load value of the 082C chain to 8000N. The deviation of the chain length accuracy of this standard has increased. The side bending of this standard has expanded the acceptance range of the 082C chain. Appendix A of this standard is a prompt appendix.
This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Chain Transmission Standardization Technical Committee. The responsible drafting unit of this standard: Jilin University (formerly Jilin University of Technology). Participating drafting units of this standard: Nanjing Limin (Group) Company, Shanghai Spik Development Corporation Bicycle Chain Company, Tangshan Jingpin Chain Group Company.
Main drafters of this standard: Sui Xuemin, Qin Jianming, Xin Haoguang, Wang Zhichen Participating drafters of this standard: Zhao Sailiang, Meng Xiangbin, Xie Juan, Ge Dejun, Shan Lijun. This standard is interpreted by the National Technical Committee for Standardization of Chain Drives. 100
GB/T3579-2002
ISOForeword
ISO (International Organization for Standardization) is a worldwide federation of national standardization organizations (ISO member states). The development of international standards is usually carried out by ISO's technical committees. Each member country has an interest in a project for which a technical committee has been established and has the right to participate in the committee. International organizations, both governmental and non-governmental, that have ties to ISO can also participate in the work. ISO works closely with the International Electrotechnical Commission (IEC) in the development of electrical standards. Draft international standards are sent by technical committees to member states for voting. No less than 75% of member states must vote in favor before they can be issued as international standards.
International Standard ISO9633 was developed by ISO)/TC100 Technical Committee on Chain and Sprockets for Transmission and Conveying. Appendix A of this standard is provided for information only. 101
1 Scope
National Standard of the People's Republic of China
Technical conditions and test methods for bicycle chains Cycle chains--Characteristics and test methods GB/T35792002
eqv ISO 9633:1992
This standard specifies the dimensions and mechanical properties of bicycle chains. This standard also specifies the methods for testing these mechanical properties, namely: torsion, lateral deviation, dead knot and lateral bending. The dimensions of the sprockets matching the bicycle are specified in Chapter 5 of GB/T1243-1997. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1243:-1997 Precision roller chains and sprockets for short pitch transmission (eqvISO) 606:1994) G13/T9785--1988 Chain and sprocket terminology 3 Definitions
This standard adopts the following definitions.
3.1 Lateral deviation
The error formed by the center line of the inner link of the chain and the geometric center line of the chain. 3.2 Side bend
Put the chain on a plane so that all the pins are parallel to the plane. Bend the chain sideways to the maximum extent allowed by its tolerance, and then measure the height of its bend. 3.3 Dead joint
The hinge of a link cannot rotate smoothly to the left and right at an angle of 60° relative to the adjacent link. 3.4 Distortion
The hinge axes between the links are not in the same plane. 4 Bicycle chain
4.1 Designation
This standard adopts the chain numbering in IS09633:1992. All requirements in Table 1 apply only to bicycle chains. 4.2 Dimensions
Table 1 specifies the dimensions of bicycle chains as shown in Figure 1. These dimensions ensure that chains produced by different manufacturers are completely interchangeable.
Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on January 16, 2002102
Implementation on July 1, 2002
GB/T 3579--2002
Figure 1 Chain
Table 1 Main dimensions, measuring forces and tensile loads of chains Roller Inner section Pin Bushing Pitch
Diameter Inner diameter Height
Bend link Length inch!
Lock end
【Inner chain, outer chain
【Outer width, inner width
081C12.77.753.303.663.7110.179.919.915.3610.0815.6
082012.77.752.38 3.66 3.7110.1719.91 9.91 LengthWww.bzxZ.net
3) 4.64.738-2
1) If the application conditions of rock bicycle chain are heavy, it is not recommended to use bent plate links. 2) The actual size will depend on the type of locking parts, but shall not exceed the values specified in Table 1. The specific values should be obtained from the manufacturer. 3) 082C chain is usually assembled with straight plate links and is not equipped with bent plate links. 4) If agreed between the user and the manufacturer. The minimum tensile load can be greater than the value specified in the table. 4.3 Tensile test
4.3.1 Chain The minimum tensile loads are given in Table 1. h
Test tensile
1258000
1258000
The values in Table 1 are valid only when the test is carried out at the lengths and under the test conditions specified below. The tensile load shall not be less than the minimum tensile load given in Table 1 and shall be applied slowly to both ends of the chain. The chain shall consist of at least five free links and the clamps connected shall allow the chain to move freely in the normal plane of the hinge on both sides of the chain centre line. Failure is considered to occur when the load does not increase to the south of the chain. The initial point where the deformation (length) continues to increase, that is, the peak point of the load-elongation diagram. If failure occurs at the connection between the chain link and the clamp, the test is invalid. 4.3.2 The tensile test is considered to be a destructive test, and the specimens after the tensile test should be scrapped. 4.4 Pre-tension load
The chain should be pre-tensioned, and the pre-tension load should not be less than one-tenth of the minimum tensile load value specified in Table 1. 4.5 Chain length accuracy
The assembled chain should be measured in length after pre-tensioning, before adding lubricating oil or after degreasing. Standard measurement The minimum measuring length is 610mm. Both ends of the chain should be inner links. The chain to be measured should be supported throughout its measuring length and the measuring force should be applied according to the value specified in Table 1. The measuring deviation should be two 8% of the nominal length of the chain to be measured. 100
4.6 Marking
The chain should be marked as follows:
a) Manufacturer's name or trademark;
b) Chain number in Table 1.
5 Determination of twist
5.1 Visual inspection of twist
GB/T 3579--2002
Visual inspection is to suspend one end of the chain and observe whether the links are arranged neatly. Note: Daily inspection is only used to check local defects, while the procedure specified in 5.2 can determine the distortion and give an evaluation of the distortion of the chain. 5.2 Twist test method
5.2.1 Test equipment
The equipment for testing the distortion is shown in Figure 2, which should meet the geometric relationship requirements shown in Figure 3. 5.2.2 Sample
Select a chain consisting of 49 links, without lubricating grease, and with inner links at both ends. 5.2.3 Specimen installation
The chain is suspended by the connecting pin (D (see Figure 3) of the sliding clamp L. The sliding clamp allows free rotation on both sides of the chain centerline, with a maximum rotation of 1°
Before the test begins, the calibration of the upper and lower connecting pins should meet the following requirements: 13+19
The inner link at the lower end of the test chain should be clamped on the first-level clamp. 5.2.4 Test procedure
At the lower end of the chain, a tensile load of 5N is applied by a balancing weight. Note: This force can be measured by a dynamometer.
First, apply a tensile load of 5N to the lower end of the chain in an angular direction. 0.2N·m torque, then change to another angle direction and repeat the above operation.
Measure the angular displacement values on both sides of the zero position of the equipment (see Figure 4). Angle α is the net twist value of the test chain in the clockwise (or counterclockwise) direction relative to the zero position of the equipment. From top to bottom, the angle α is positive when it rotates counterclockwise from the zero position of the equipment. Conversely, it is negative when it rotates clockwise from the zero position of the equipment. The calculated value of the net twist α is equal to half of the difference between αi and α. The negative value of α or only indicates that the test chain viewed from top to bottom is a net twist rotated clockwise, which does not have the meaning of algebraic negative values.
5.2.5 Acceptance criteria
The values of α and ↑ shall be within the following limits: —15°α+15°where α=(αα)/2
—0.17≤+0.17wherein=α/8,8=α-α2104
Balanced vertical weight—
Torsionally shortened balanced weight
GB/T3579--2002
Sliding chuck
Fixed chuck
Figure 2 Test equipment for determining the amount of distortion
Indicator
Dividing plate
GB/T 35792002
PI is determined by the vertical planes perpendicular to each other, the displacement axis AB of the sliding head and the end attachment connecting pin (D) of the chain. Note: The pins (\I) and (\D') are not the end pins of the chain, they are the pins on the test equipment accessories. 12 is a horizontal plane perpendicular to 1.
Point O is the projection point of the AB axis on the plane P. It is the origin. It is also the intersection of the AB axis and the half plane P, 1. Point is the symmetry center point of the connecting pin (\I) on the lower end of the chain. It can: a) coincide with point;
b) be located on the intersection line of the plane. The maximum distance from point 0 is: ) on plane P, assuming it is not on \:. In this case (should not fall outside the circle with radius "·center coincident with). β is the angle that the connecting pin (\1) can rotate in plane 1 T. In plane P L, it is the angle that the connecting pin (\1) can rotate in plane 1 T. If (is on the intersection line of planes P and 7, then it is the angle that the connecting pin (\1) rotates in plane P: If (is not on the intersection line of planes 1:, then it is the angle of rotation on a certain plane P\ parallel to plane 7, Figure 3 Geometric relationship of the test equipment
--02)/2;t+-α/8:
Total distortion = αα
Figure 4 Measurement of distortion
6 Determination of lateral deviation
61 Measurement of lateral deviation
GB/T 3579- -2002
When visually inspecting the lateral deviation of the chain, one end of the chain should be suspended and the links should be observed to see whether they are neatly arranged. 6.2 Method for determining lateral deviation
6.2.1 Test equipment
The equipment used to measure lateral deviation is two specially made special rulers. The surfaces of the rulers should be ground to the size specified in Table 2. For ease of use, two specifications of bicycle chains can be combined on a bracket, as shown in Figure 5. Table 2 Ruler dimensions (see Figure 6)
Note: Length 1 is equivalent to 28 chain pitches.
Special ruler for testing 081C chain
Special ruler for testing 082C chain
Retainer
Figure 5 Ruler retainer assembly
Figure 6 Ruler
Side view
6.2.2 Test procedure
GB/T 3579.--2002
A chain specimen consisting of at least 49 links is placed horizontally with its pin parallel to the horizontal plane. Fix one end of the chain and apply a tensile force of 12.5 N to the other end of the chain (see Figure 7). Starting from the fixed end of the chain, slide the test ruler along the inner width of the inner section of the chain over the entire length of the specimen to check whether the chain is correctly positioned. Increase the tension to 1 kN and, starting from the fixed end of the chain, slide the ruler along the inner width of the inner section of the chain over the entire length of the specimen. Deviation
Total deviation
Right deviation
Figure 7 Schematic diagram of the determination of lateral deviation
6.2.3 Acceptance criteria
The test is accepted if the ruler can be moved freely by hand along the entire length of the specimen when the tension is increased to 1 kN. 7 Inspection of dead joints
7.1 Test procedure
Take a chain and place it on a flat plate with its pin parallel to the plate surface. Fix the chain end and place a test bar with a diameter of 25.4 mm under the chain and move it slowly and continuously under the entire length of the chain to the free end of the chain. Then turn the chain over and repeat the above test. Any chain link that does not fall flat back to the plane during the two tests is considered to be a dead joint. Note: If there is any doubt about the test result, the chain should be degreased and the above test repeated. 7.2 Acceptance criteria
Dead joints are not allowed in the chain.
8 Determination of lateral deflection
8.1 Method for measuring lateral deflection
8.1.1 Take a chain consisting of 49 links with inner links at both ends and degrease it. Place the chain on a flat plate with its pin parallel to the plate surface and then apply a force of 3N from each end, as shown in Figure 8. Gradually remove the force and measure the arc height h. 108
GB/T3579-2002
Figure 8 Determination of camber
8.1.2 Turn the chain over and repeat the test in 8.1.1. 8.1.3 The minimum of the two measurements is considered to be the camber value h of the chain. 8.2 Acceptance criteria
Requirements The values measured in 8.1.1 and 8.1.2 shall be within the following limits: Measuring ruler
40 mm ≤ h ≤ 70 mm
(081C)
40 mm h ≤ 120 mm
(082C)
Plane plate
An example of calculation of the distortion is given in Table A1. GB/T 3579--2002
Appendix A
(Suggestive Appendix)
Example of calculation of distortion
Example of calculation of distortion
α-(α*α2)/2
0.171 0.17
Situation!
α2:10
a>±15°
8=90°
5-35/90°-0.39
The chain is outside the limits specified in
5.2.5
Case 2
α 100
α2:=80°
α- 35°
a>=15°
It- -- 35°/90° - 0. 39
The chain is outside the limits specified in
5.2.5
Case 3
Q:-35
α=5°
f-- 5/80* - 0. 06
Chain is within the limits specified in 5.2.5
Case
Chain is within the limits specified in 3.2.5
Note: The negative sign in the formula indicates the net twist of the chain in the test in the clockwise direction, and does not have the meaning of algebraic negative value. α: It is the twist angle value in the clockwise direction; when α is a negative sign, it is the actual twist angle in the clockwise direction on the test equipment; when α is a positive sign, it is the actual twist angle in the counterclockwise direction on the test equipment. 1101 Test equipment
The equipment used to measure the lateral deviation is two special rulers. The ruler surfaces should be ground to the size specified in Table 2. For ease of use, two sizes of bicycle chain can be combined on a bracket, as shown in Figure 5. Table 2 Ruler dimensions (see Figure 6)
Note: Length 1 is equivalent to 28 chain pitches.
Special ruler for testing 081C chain
Special ruler for testing 082C chain
Retainer
Figure 5 Ruler retainer assembly
Figure 6 Ruler
Side view
6.2.2 Test procedure
GB/T 3579.--2002
Place the chain sample consisting of at least 49 links horizontally with its pin parallel to the horizontal plane. Fix one end of the chain and apply a tensile force of 12.5 N to the other end of the chain (see Figure 7). Starting from the fixed end of the chain, slide the test ruler along the inner width of the inner section of the chain over the entire length of the specimen to check whether the chain is correctly positioned. Increase the tension to 1 kN and, starting from the fixed end of the chain, slide the ruler along the inner width of the inner section of the chain over the entire length of the specimen. Deviation
Total deviation
Right deviation
Figure 7 Schematic diagram of the determination of lateral deviation
6.2.3 Acceptance criteria
If the ruler can be moved freely by hand along the entire length of the specimen when the tension is increased to 1 kN, the test is accepted. 7 Check of dead joints
7.1 Test procedure
Place a chain on a flat plate with its pin parallel to the plate surface. Fix the chain end and place a test bar with a diameter of 25.4 mm under the chain. Move it slowly and continuously under the entire length of the chain to the free end of the chain. Then turn the chain over and repeat the above test. Any link that does not fall flat back to the plane during the two tests is considered to be a dead link. Note: If there is any doubt about the test result, the chain should be degreased and the above test repeated. 7.2 Acceptance standard
Dead links are not allowed in the chain.
8 Determination of lateral bending
8.1 Method for measuring lateral bending
8.1.1 Take a chain consisting of 49 links, with the two ends as inner links, and degrease it. Place the chain on a flat plate with its pin parallel to the flat plate surface, and then apply a force of 3N from each end, as shown in Figure 8. Gradually remove this force and measure the arc height h. 108
GB/T3579-2002
Figure 8 Determination of camber
8.1.2 Turn the chain over and repeat the test according to 8.1.1. 8.1.3 The minimum value of the two measurements is considered to be the camber value h of the chain8.2 Acceptance criteria
RequirementsThe values measured in 8.1.1 and 8.1.2 should be within the following limits:Measuring ruler
40 mm≤h≤70 mm
(081C)
40mmh≤120mm
(082C)
Plane plate
An example of calculation of the distortion is given in Table A1. GB/T 3579--2002
Appendix A
(Suggestive Appendix)
Example of calculation of distortion
Example of calculation of distortion
α-(α*α2)/2
0.171 0.17
Situation!
α2:10
a>±15°
8=90°
5-35/90°-0.39
The chain is outside the limits specified in
5.2.5
Case 2
α 100
α2:=80°
α- 35°
a>=15°
It- -- 35°/90° - 0. 39
The chain is outside the limits specified in
5.2.5
Case 3
Q:-35
α=5°
f-- 5/80* - 0. 06
Chain is within the limits specified in 5.2.5
Case
Chain is within the limits specified in 3.2.5
Note: The negative sign in the formula indicates the net twist of the chain in the test in the clockwise direction, and does not have the meaning of algebraic negative value. α: It is the twist angle value in the clockwise direction; when α is a negative sign, it is the actual twist angle in the clockwise direction on the test equipment; when α is a positive sign, it is the actual twist angle in the counterclockwise direction on the test equipment. 1101 Test equipment
The equipment used to measure the lateral deviation is two special rulers. The ruler surfaces should be ground to the size specified in Table 2. For ease of use, two sizes of bicycle chain can be combined on a bracket, as shown in Figure 5. Table 2 Ruler dimensions (see Figure 6)
Note: Length 1 is equivalent to 28 chain pitches.
Special ruler for testing 081C chain
Special ruler for testing 082C chain
Retainer
Figure 5 Ruler retainer assembly
Figure 6 Ruler
Side view
6.2.2 Test procedure
GB/T 3579.--2002
Place the chain sample consisting of at least 49 links horizontally with its pin parallel to the horizontal plane. Fix one end of the chain and apply a tensile force of 12.5 N to the other end of the chain (see Figure 7). Starting from the fixed end of the chain, slide the test ruler along the inner width of the inner section of the chain over the entire length of the specimen to check whether the chain is correctly positioned. Increase the tension to 1 kN and, starting from the fixed end of the chain, slide the ruler along the inner width of the inner section of the chain over the entire length of the specimen. Deviation
Total deviation
Right deviation
Figure 7 Schematic diagram of the determination of lateral deviation
6.2.3 Acceptance criteria
If the ruler can be moved freely by hand along the entire length of the specimen when the tension is increased to 1 kN, the test is accepted. 7 Check of dead joints
7.1 Test procedure
Place a chain on a flat plate with its pin parallel to the plate surface. Fix the chain end and place a test bar with a diameter of 25.4 mm under the chain. Move it slowly and continuously under the entire length of the chain to the free end of the chain. Then turn the chain over and repeat the above test. Any link that does not fall flat back to the plane during the two tests is considered to be a dead link. Note: If there is any doubt about the test result, the chain should be degreased and the above test repeated. 7.2 Acceptance standard
Dead links are not allowed in the chain.
8 Determination of lateral bending
8.1 Method for measuring lateral bending
8.1.1 Take a chain consisting of 49 links, with the two ends as inner links, and degrease it. Place the chain on a flat plate with its pin parallel to the flat plate surface, and then apply a force of 3N from each end, as shown in Figure 8. Gradually remove this force and measure the arc height h. 108
GB/T3579-2002
Figure 8 Determination of camber
8.1.2 Turn the chain over and repeat the test according to 8.1.1. 8.1.3 The minimum value of the two measurements is considered to be the camber value h of the chain8.2 Acceptance criteria
RequirementsThe values measured in 8.1.1 and 8.1.2 should be within the following limits:Measuring ruler
40 mm≤h≤70 mm
(081C)
40mmh≤120mm
(082C)
Plane plate
An example of calculation of the distortion is given in Table A1. GB/T 3579--2002
Appendix A
(Suggestive Appendix)
Example of calculation of distortion
Example of calculation of distortion
α-(α*α2)/2
0.171 0.17
Situation!
α2:10
a>±15°
8=90°
5-35/90°-0.39
The chain is outside the limits specified in
5.2.5
Case 2
α 100
α2:=80°
α- 35°
a>=15°
It- -- 35°/90° - 0. 39
The chain is outside the limits specified in
5.2.5
Case 3
Q:-35
α=5°
f-- 5/80* - 0. 06
Chain is within the limits specified in 5.2.5
Case
Chain is within the limits specified in 3.2.5
Note: The negative sign in the formula indicates the net twist of the chain in the test in the clockwise direction, and does not have the meaning of algebraic negative value. α: It is the twist angle value in the clockwise direction; when α is a negative sign, it is the actual twist angle in the clockwise direction on the test equipment; when α is a positive sign, it is the actual twist angle in the counterclockwise direction on the test equipment. 11006
Chain is within the limits specified in 5.2.5
Case
Chain is within the limits specified in 3.2.5
Note: The negative sign in the formula indicates the net twist of the chain in the test in the clockwise direction, and does not have the meaning of algebraic negative value. α: It is the twist angle value in the clockwise direction; when α is a negative sign, it is the actual twist angle in the clockwise direction on the test equipment; when α is a positive sign, it is the actual twist angle in the counterclockwise direction on the test equipment. 11006
Chain is within the limits specified in 5.2.5
Case
Chain is within the limits specified in 3.2.5
Note: The negative sign in the formula indicates the net twist of the chain in the test in the clockwise direction, and does not have the meaning of algebraic negative value. α: It is the twist angle value in the clockwise direction; when α is a negative sign, it is the actual twist angle in the clockwise direction on the test equipment; when α is a positive sign, it is the actual twist angle in the counterclockwise direction on the test equipment. 110
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