QC/T 62-2021 English PDF (QCT62-2021)

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QC/T 62-2021: Shock absorber for motorcycles and mopeds
QC/T 62-2021
QC
AUTOMOTIVE INDUSTRY STANDARD
ICS 43.140
CCS T 83
Replacing QC/T 62-2007
Shock absorber for motorcycles and mopeds
ISSUED ON. AUGUST 21, 2021
IMPLEMENTED ON. FEBRUARY 01, 2022
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 5
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 7
4 Requirements... 9
5 Test methods... 14
6 Inspection rules... 31
7 Product marking, packaging, transportation, storage... 32
Shock absorber for motorcycles and mopeds
1 Scope
This document specifies the requirements, test methods, inspection rules, product
marking, packaging, transportation, storage of shock absorber for motorcycle and
moped.
This document applies to shock absorbers for motorcycle and moped, which are
composed of springs, dampers, connectors (hereinafter referred to as shock absorbers).
Shock absorbers without hydraulic damping can also be implemented by referring to
the relevant provisions.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated referenced
documents, only the version corresponding to the date applies to this document; for
undated referenced documents, the latest version (including all amendments) applies to
this document.
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
The following terms and definitions apply to this document.
3.1
Shock absorber
Components composed of springs, dampers, connectors.
4.1.2 The allowable deviation of the free length of the front shock absorber is ±2.5 mm;
the allowable deviation of the free length of the rear shock absorber is ±2.0 mm.
4.1.3 The surface of electroplating layer and coating shall be smooth, flat, uniform in
color.
4.1.4 The weld shall be smooth and uniform; it shall be free of defects such as weld
beading, burn through, slag inclusions, cracks, blisters, spatter.
4.1.5 There shall be no oil leakage from the shock absorber, whether it is placed flat,
upside down or during operation.
4.1.6 During the compression and stretching process, the dampers of front shock
absorber and rear shock absorber shall move flexibly without getting stuck; there shall
be no metal impact sound or abnormal friction.
4.2 Strength
4.2.1 The structural strength of the shock absorber shall meet the requirements of
product drawings and technical documents.
4.2.2 Riveting, folding and sealing, threaded connections, welding and other parts shall
be free of damage or fracture, under the tensile and compressive loads specified in
product drawings and technical documents.
4.3 Spring performance
4.3.1 Accuracy
The spring shall comply with the provisions of GB/T 1239.2.The accuracy level shall
not be lower than level 2.
4.3.2 Static characteristics
The static characteristics of the spring shall meet the following requirements.
a) When assessing the load at a specified height, the deformation shall be selected
within the range of 20% ~ 80% of the assessment stiffness section. The limit
deviation of the spring load is ±8%;
b) When assessing stiffness, the deformation shall be selected within the range of
25% ~ 75% of the stiffness assessment section; the limit deviation of spring
stiffness is ±8%;
c) The static characteristics of the spring are usually assessed based on the load at a
specified height; the stiffness can also be selected. However, the two cannot be
assessed at the same time.
4.3.3 Permanent deformation
After the spring is compressed to the maximum working load for three consecutive
times, its permanent deformation shall not be greater than 0.3% of the free height before
the test.
4.3.4 Fatigue
After the spring is continuously tested for 2 × 105 times at the working stroke, there
shall be no cracks or fractures; its permanent deformation shall not be greater than 2%
of the free height before the test.
4.4 Damper characteristics
4.4.1 Force-displacement characteristics
Damper resistance shall meet the following requirements.
a) The graphics of the force-displacement diagram shall be normal;
b) The compression buffer resistance of the front shock absorber's damper shall not
be less than 200% of the recovery resistance;
c) The resistance tolerance of the damper is as shown in Table 1 and Table 2;
d) If there are special requirements, the resistance at V = 0.1, 0.3, 0.5 (0.6), 0.7, 1.0
m/s shall be tested.
4.4.2 Force-velocity characteristics
The allowable deviation of the resistance of the damper at each specified speed is as
specified in Table 1 and Table 2.
Table 1 -- Resistance tolerance of dampers for ordinary motorcycle shock
absorber at different speeds
Item Front damper / (m/s) Rear damper / (m/s) 0.3, 0.5 0.3, 0.5
Shock absorber of
ordinary
motorcycle
Recovery resistance Ff (N) ± (15%Ff + 20) ± (13%Ff + 20)
Compression resistance Fy (N) - ± (20%Fy + 20)
absorber shall comply with the product drawings and technical documents.
4.6 Gas recoil force
For gas-filled shock absorbers, the gas recoil force Fa shall comply with the product
drawings and technical documents, OR the technical requirements agreed between the
supplier and the buyer.
4.7 Static load characteristics
The vertical (or axial) static load characteristics of the shock absorber shall comply with
the product drawings and technical documents.
4.8 Anti-foam characteristics
During the test, the damper shall not have obvious abnormal noise; the maximum
fluctuation rate of the three measured force-displacement diagrams shall not exceed
25%.
4.9 Cushion pad durability
After the cushion pad is tested continuously for 2×105 times at the maximum allowable
deformation, there shall be no damage, deformation or wear; its load loss rate shall not
be greater than 30%.
4.10 Shock absorber durability
4.10.1 Vertical vibration
Durability during vertical vibration shall meet the following requirements.
a) During the test, there shall be no abnormal noise. After testing 1 × 106 times, the
parts shall be free of damage, deformation, abnormal wear;
b) If a lateral force test is required, the lateral force is 290 N ~ 490 N. After 200 h of
testing, the parts shall be free of damage, deformation, abnormal wear;
c) There is no oil leakage; there shall be no clearly visible oil layer on the surface of
the working section; if test b) is performed, slight traces of oil less than 12 mm
wide can be seen on the surface of the working section;
d) The resistance attenuation rate shall not be greater than 30%.
4.10.2 Drum vibration
The durability of the drum when vibrating shall meet the following requirements.
a) During the test, there shall be no abnormal noise. After 6 × 105 tests, the parts
shall be free of damage, deformation, abnormal wear;
b) Follow the provisions of 4.10.1c).
4.11 Sand, dust, muddy water resistance of dust cover
4.11.1 During the test, there shall be no abnormal noise...