Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents.
This part is a revision of QC/T 62-2007 Shock absorber for motorcycles and mopeds. In addition to editorial changes, the following main changes have been made with respect to QC/T 62-2007:
——The terms and definitions of "gas recoil force" and "anti-foam characteristic" have been added (see 3.12 and 3.13);
——In the text, "shock absorbing spring" has been modified to "spring" to unify industry terms;
——The sentence "shock absorbers without hydraulic damping may also be implemented with reference to relevant regulations" has been modified (see 1; 1 in 2007 edition);
——The description "at a speed not greater than 0.005 m/s" has been modified (see 3.11; 3.11 in 2007 edition);
——The sentence "the ultimate deviation of spring rate is ±8%" has been modified (see 4.3.2 b); 4.3.2 b) in 2007 edition);
——The force tolerances of shock absorber dampers for general motorcycles at different speeds have been modified (see Table 1; 4.4.1 b) and c) in 2007 edition);
——The Table 2 "Force tolerances of shock absorber dampers for sport and racing motorcycles at different speeds" has been added (see Table 2 of 4.4.1);
——The resistance decay rate of damper at different temperatures has been modified (see Table 3; 4.4.3 in 2007 edition);
——The friction force with lateral force applied has been added (see 4.5.2);
——The gas recoil force has been added (see 4.6);
——The vertical (or axial) static load characteristic of shock absorber has been modified (see 4.7; 4.6 in 2007 edition);
——The anti-foam characteristic has been added (see 4.8);
——The description "apply 290 N ~ 490 N of lateral force in the test, if required, for testing for 200 hours" has been added (see 4.10.1 b);
——The dust and mud water resistance characteristics of dust cover have been added (see 4.11);
——The anodic oxidized coating has been added (see 4.12.4);
——The sentence "the displacement measurement error shall be less than 0.5%, and the force measurement error shall be less than 1%" has been modified (see 5.5.1 a); 5.5.1 a) in 2007 edition);
——The description "in the ventilated state" has been modified (see 5.5.3 a); 5.5.3 a) in 2007 edition);
——The temperature of test pieces of front and rear shock absorbers has been modified (see Table 5; 5.7.2 a) in 2007 edition);
——The Figure 6 "Test bench for simulating static friction force of real vehicles by front shock absorber" has been added (see 5.8.1);
——The expression "for front shock absorber, the distance from the free length to the minimum length minus 2.5 mm; for rear shock absorber, the distance from the free length to the minimum length" has been modified (see 5.10.2 b), 5.9.2 b) in 2007 edition);
——The tests of "gas recoil force", "anti-foam characteristic" and "dust and mud water resistance characteristic" have been added (see 5.9, 5.11 and 5.15);
——The expression "vertical endurance test bench for shock absorber, air cooling device and temperature measuring instrument (see Figures 11 and 12)" have been modified (see 5.13.1; 5.11.1 in 2007 edition);
——The formats of stroke, speed and counterweight have been modified (see Table 6; 5.12.2 b), c) and d) in 2007 edition);
——The conditions of solar radiation test have been added (see 5.17).
This document was proposed by and is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
The previous editions of this document are as follows:
——This document was first issued in 1993 with the serial number of QC/T 62-1993;
——It was first revised in 2007, which incorporated the content of QC/T 63-1993 Test method for motorcycle shock absorber.
——This edition is the second revision.
Shock absorber for motorcycles and mopeds
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of shock absorber for motorcycles and mopeds.
This document is applicable to shock absorbers for motorcycles and mopeds consisting of springs, dampers and connectors (hereinafter referred to as "the shock absorber(s)"), and shock absorbers without hydraulic damping may also be implemented with reference to relevant regulations.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates — Rating of test specimens and manufactured articles subjected to corrosion tests
GB/T 10125 Corrosion tests in artificial atmospheres — Salt spray tests
GB/T 11379 Metallic coatings — Electroplated coatings of chromium for engineering purposes
GB/T 1239.2 Cold coiled helical springs technical specifications — Part 2: Compressions spring
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
shock absorber
component composed of spring, damper and connector
3.2
free length
length of the shock absorber without external force
3.3
maximum length
length of the shock absorber stretched to ultimate position
3.4
minimum length
length of the shock absorber compressed to ultimate position
3.5
working stroke
difference between maximum and minimum length of the shock absorber
3.6
hydraulic damper
component that plays a damping role by hydraulic throttling, referred to as damper
3.7
force-displacement characteristic
relation curve between the damper's resistance and displacement in the event of relative simple harmonic motion of both ends according to specified stroke and speed (maximum speed), which is also called force-displacement curve. In the force-displacement curve, the resistance at the stroke midpoint is the resistance at the specified speed; the resistance on the compression side is called the compression resistance (Fy), and the resistance on the recovery (elongation) side is called the recovery resistance (Ff)
3.8
force-velocity characteristic
relation curve between the damper's resistance and speed in the event of relative simple harmonic motion of both ends according to specified stroke at multiple speeds
3.9
force-temperature characteristic
relation curve between the damper's resistance and temperature in the event of relative simple harmonic motion of both ends according to specified stroke and speed at multiple temperatures
3.10
static friction force
friction force generated at the working stroke midpoint of the shock absorber in the event of relative simple harmonic motion of both ends according to specified installation conditions at the speed not greater than 0.005 m/s
3.11
static load characteristic
relation curve between load and displacement of the shock absorber in the event of relative simple harmonic motion of both ends according to specified stroke at the speed not greater than 0.005 m/s
3.12
gas recoil force
in the case of inflatable shock absorber, force acting on the piston rod by gas when the piston is at the midpoint of the working stroke
3.13
anti-foam characteristic
ability of force-displacement characteristic to resist the influence of oil foam
4 Requirements
4.1 General requirements
4.1.1 Shock absorbers shall be manufactured in accordance with the product drawings and technical documents approved by the prescribed procedures, and shall meet the requirements of this document.
4.1.2 The allowable deviation of free length of a front shock absorber is ±2.5 mm, and the allowable deviation of free length of a rear shock absorber is ±2.0 mm.
4.1.3 The electroplated coating and coating surface shall be smooth, flat and uniform in color and luster.
4.1.4 The weld shall be flat and uniform, and shall be free of defects such as overlap, ablation, slag inclusions, crack, bubble and spatter.
4.1.5 The shock absorber shall be free of oil leakage whether it is laid flat, upside down or in the process of working.
4.1.6 In the process of compression and tension, the front and rear shock absorber dampers shall work flexibly without being stuck, and shall be free from metal impact sound and abnormal friction.
4.2 Strength
4.2.1 The structural strength of the shock absorber shall meet the requirements of the product drawings and technical documents.
4.2.2 Riveting, folding and sealing, threaded connection, welding and other parts shall be free from damage and fracture under the tension and compression loads specified in product drawings and technical documents.
4.3 Performance of spring
4.3.1 Precision
The precision of spring shall meet the requirement of GB/T 1239.2, i.e., the precision grade shall not be inferior to Grade 2.
4.3.2 Static characteristic
The static characteristic of spring shall meet the following requirements:
a) When assessing the load at the specified height, the deflection shall be selected within the range of 20% ~ 80% of the rigidity assessment section, and the ultimate deviation of spring load is ±8%;
b) When assessing the rigidity, the deflection shall be selected within the range of 25% ~ 75% of the rigidity assessment section, and the ultimate deviation of spring rigidity is ±8%;
c) The static characteristic of spring is usually assessed under the load at the specified height, and the rigidity may also be assessed, but they cannot be assessed at the same time.
4.3.3 Permanent deformation
After the spring is continuously compressed to the maximum working load for 3 times, its permanent deformation shall not exceed 0.3% of the free height before the test.
4.3.4 Fatigue
The spring subject to continuous tests in working stroke for 2×105 times shall be free of cracks and fractures, and its permanent deformation shall not be more than 2% of the free height before the test.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Requirements 5 Test methods 6 Test rules 7 Marking, packaging, transportation and storage
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents.
This part is a revision of QC/T 62-2007 Shock absorber for motorcycles and mopeds. In addition to editorial changes, the following main changes have been made with respect to QC/T 62-2007:
——The terms and definitions of "gas recoil force" and "anti-foam characteristic" have been added (see 3.12 and 3.13);
——In the text, "shock absorbing spring" has been modified to "spring" to unify industry terms;
——The sentence "shock absorbers without hydraulic damping may also be implemented with reference to relevant regulations" has been modified (see 1; 1 in 2007 edition);
——The description "at a speed not greater than 0.005 m/s" has been modified (see 3.11; 3.11 in 2007 edition);
——The sentence "the ultimate deviation of spring rate is ±8%" has been modified (see 4.3.2 b); 4.3.2 b) in 2007 edition);
——The force tolerances of shock absorber dampers for general motorcycles at different speeds have been modified (see Table 1; 4.4.1 b) and c) in 2007 edition);
——The Table 2 "Force tolerances of shock absorber dampers for sport and racing motorcycles at different speeds" has been added (see Table 2 of 4.4.1);
——The resistance decay rate of damper at different temperatures has been modified (see Table 3; 4.4.3 in 2007 edition);
——The friction force with lateral force applied has been added (see 4.5.2);
——The gas recoil force has been added (see 4.6);
——The vertical (or axial) static load characteristic of shock absorber has been modified (see 4.7; 4.6 in 2007 edition);
——The anti-foam characteristic has been added (see 4.8);
——The description "apply 290 N ~ 490 N of lateral force in the test, if required, for testing for 200 hours" has been added (see 4.10.1 b);
——The dust and mud water resistance characteristics of dust cover have been added (see 4.11);
——The anodic oxidized coating has been added (see 4.12.4);
——The sentence "the displacement measurement error shall be less than 0.5%, and the force measurement error shall be less than 1%" has been modified (see 5.5.1 a); 5.5.1 a) in 2007 edition);
——The description "in the ventilated state" has been modified (see 5.5.3 a); 5.5.3 a) in 2007 edition);
——The temperature of test pieces of front and rear shock absorbers has been modified (see Table 5; 5.7.2 a) in 2007 edition);
——The Figure 6 "Test bench for simulating static friction force of real vehicles by front shock absorber" has been added (see 5.8.1);
——The expression "for front shock absorber, the distance from the free length to the minimum length minus 2.5 mm; for rear shock absorber, the distance from the free length to the minimum length" has been modified (see 5.10.2 b), 5.9.2 b) in 2007 edition);
——The tests of "gas recoil force", "anti-foam characteristic" and "dust and mud water resistance characteristic" have been added (see 5.9, 5.11 and 5.15);
——The expression "vertical endurance test bench for shock absorber, air cooling device and temperature measuring instrument (see Figures 11 and 12)" have been modified (see 5.13.1; 5.11.1 in 2007 edition);
——The formats of stroke, speed and counterweight have been modified (see Table 6; 5.12.2 b), c) and d) in 2007 edition);
——The conditions of solar radiation test have been added (see 5.17).
This document was proposed by and is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
The previous editions of this document are as follows:
——This document was first issued in 1993 with the serial number of QC/T 62-1993;
——It was first revised in 2007, which incorporated the content of QC/T 63-1993 Test method for motorcycle shock absorber.
——This edition is the second revision.
Shock absorber for motorcycles and mopeds
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of shock absorber for motorcycles and mopeds.
This document is applicable to shock absorbers for motorcycles and mopeds consisting of springs, dampers and connectors (hereinafter referred to as "the shock absorber(s)"), and shock absorbers without hydraulic damping may also be implemented with reference to relevant regulations.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates — Rating of test specimens and manufactured articles subjected to corrosion tests
GB/T 10125 Corrosion tests in artificial atmospheres — Salt spray tests
GB/T 11379 Metallic coatings — Electroplated coatings of chromium for engineering purposes
GB/T 1239.2 Cold coiled helical springs technical specifications — Part 2: Compressions spring
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
shock absorber
component composed of spring, damper and connector
3.2
free length
length of the shock absorber without external force
3.3
maximum length
length of the shock absorber stretched to ultimate position
3.4
minimum length
length of the shock absorber compressed to ultimate position
3.5
working stroke
difference between maximum and minimum length of the shock absorber
3.6
hydraulic damper
component that plays a damping role by hydraulic throttling, referred to as damper
3.7
force-displacement characteristic
relation curve between the damper's resistance and displacement in the event of relative simple harmonic motion of both ends according to specified stroke and speed (maximum speed), which is also called force-displacement curve. In the force-displacement curve, the resistance at the stroke midpoint is the resistance at the specified speed; the resistance on the compression side is called the compression resistance (Fy), and the resistance on the recovery (elongation) side is called the recovery resistance (Ff)
3.8
force-velocity characteristic
relation curve between the damper's resistance and speed in the event of relative simple harmonic motion of both ends according to specified stroke at multiple speeds
3.9
force-temperature characteristic
relation curve between the damper's resistance and temperature in the event of relative simple harmonic motion of both ends according to specified stroke and speed at multiple temperatures
3.10
static friction force
friction force generated at the working stroke midpoint of the shock absorber in the event of relative simple harmonic motion of both ends according to specified installation conditions at the speed not greater than 0.005 m/s
3.11
static load characteristic
relation curve between load and displacement of the shock absorber in the event of relative simple harmonic motion of both ends according to specified stroke at the speed not greater than 0.005 m/s
3.12
gas recoil force
in the case of inflatable shock absorber, force acting on the piston rod by gas when the piston is at the midpoint of the working stroke
3.13
anti-foam characteristic
ability of force-displacement characteristic to resist the influence of oil foam
4 Requirements
4.1 General requirements
4.1.1 Shock absorbers shall be manufactured in accordance with the product drawings and technical documents approved by the prescribed procedures, and shall meet the requirements of this document.
4.1.2 The allowable deviation of free length of a front shock absorber is ±2.5 mm, and the allowable deviation of free length of a rear shock absorber is ±2.0 mm.
4.1.3 The electroplated coating and coating surface shall be smooth, flat and uniform in color and luster.
4.1.4 The weld shall be flat and uniform, and shall be free of defects such as overlap, ablation, slag inclusions, crack, bubble and spatter.
4.1.5 The shock absorber shall be free of oil leakage whether it is laid flat, upside down or in the process of working.
4.1.6 In the process of compression and tension, the front and rear shock absorber dampers shall work flexibly without being stuck, and shall be free from metal impact sound and abnormal friction.
4.2 Strength
4.2.1 The structural strength of the shock absorber shall meet the requirements of the product drawings and technical documents.
4.2.2 Riveting, folding and sealing, threaded connection, welding and other parts shall be free from damage and fracture under the tension and compression loads specified in product drawings and technical documents.
4.3 Performance of spring
4.3.1 Precision
The precision of spring shall meet the requirement of GB/T 1239.2, i.e., the precision grade shall not be inferior to Grade 2.
4.3.2 Static characteristic
The static characteristic of spring shall meet the following requirements:
a) When assessing the load at the specified height, the deflection shall be selected within the range of 20% ~ 80% of the rigidity assessment section, and the ultimate deviation of spring load is ±8%;
b) When assessing the rigidity, the deflection shall be selected within the range of 25% ~ 75% of the rigidity assessment section, and the ultimate deviation of spring rigidity is ±8%;
c) The static characteristic of spring is usually assessed under the load at the specified height, and the rigidity may also be assessed, but they cannot be assessed at the same time.
4.3.3 Permanent deformation
After the spring is continuously compressed to the maximum working load for 3 times, its permanent deformation shall not exceed 0.3% of the free height before the test.
4.3.4 Fatigue
The spring subject to continuous tests in working stroke for 2×105 times shall be free of cracks and fractures, and its permanent deformation shall not be more than 2% of the free height before the test.
Contents of QC/T 62-2021
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Test methods
6 Test rules
7 Marking, packaging, transportation and storage
