GB/T 37209-2018Nonmetallic rubber base wet type frictional materials (English PDF)
非金属橡胶基湿式摩擦材料
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 28, 2018
Implementation date
November 1, 2019
Scope
GB/T 37209-2018 is the English-translated version of 非金属橡胶基湿式摩擦材料.
GB/T 37209-2018 covers non-metallic rubber-based wet friction materials, the linings used in the friction elements of wet friction systems in motorcycles, agricultural machinery and industrial machinery.
It sets their classification into two categories according to use, the requirements, the test methods, the inspection rules and the marking, packaging, transport and storage.
It defines the midpoint dynamic friction coefficient, the static friction coefficient, the end dynamic friction coefficient and the wear amount, measured as the change in thickness in millimetres after the test under specified conditions.
Friction testing refers to the GB/T 35472 methods for wet automatic gearbox friction elements, including the SZBL friction tester and the dependence of friction on pressure, speed and temperature, while sampling follows GB/T 2828.1. It was issued on 28 December 2018 and has applied since 1 November 2019.
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Document preview — GB/T 37209-2018
National Standard of the People's Republic of China
- ICS
- 43.040.50
- Classification
- Q 69
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Classification
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the classification, requirements, test methods and inspection rules for non-metallic rubber-based wet friction materials (hereinafter referred to as "friction materials"). And as well as marking, packaging, transportation and storage.
This standard applies to friction materials for friction elements of wet friction systems in motorcycles, agricultural machinery and industrial machinery.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 2828.1. Sampling procedures for sampling by sampling - Part 1. Batch-to-batch sampling plan, searched by AQL
GB/T 35472.2 Test methods for friction elements of wet automatic gearbox Part 2: Guide to the use of SZBL friction testers
GB/T 35472.6 Test methods for friction elements of wet automatic gearbox Part 6: Relationship between frictional properties and pressure, velocity and temperature experiment method
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Midpoint dynamic friction coefficient
In the dynamic joint test, the coefficient of dynamic friction measured at the midpoint of the braking time.
3.2 Static friction coefficient
Static motor drive speed and static torque time shall be specified during the measurement by static joint test.
3.3 End dynamic friction coefficient
The coefficient of dynamic friction measured at the end of the dynamic joint test.
3.4 Wear amount
The difference in thickness (in millimeters) before and after the friction material test under specified conditions.
4 Classification
Non-metallic rubber-based wet friction materials are classified into two categories according to their use and should meet the requirements of Table 1.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 2828.1Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
- GB/T 35472.2Test method for friction element of wet automatic transmission—Part 2: SZBL type friction test machine guidelines
- GB/T 35472.6Test method for friction element of wet automatic transmission - Part 6: µ-PVT test method
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Related Standards
GB/T 2828.1-2012 — Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 35472.2-2017 — Test method for friction element of wet automatic transmission—Part 2: SZBL type friction test machine guidelines
GB/T 35472.6-2017 — Test method for friction element of wet automatic transmission - Part 6: µ-PVT test method
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GB/T 37209-2018
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