GB/T 41607-2022 in English

《GB/T 41607-2022湿式自动变速箱摩擦元件惯性吸收耐久性试验方法》由TC406（全国非金属矿产品及制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。

Test method for inertia absorption durability of friction elements in wet automatic transmission

1 Scope

This document specifies the test equipment and preparation, test procedures, test data, precision and test report used for the test method for inertia absorption durability of friction elements in wet automatic transmission.

This document is applicable to the determination of inertia absorption durability of friction elements in wet automatic transmission for passenger cars and commercial vehicles. Other types of friction elements in automatic transmission may be used with reference to this document.

2 Normative references

The following documents contain requirements 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 of the referenced document (including any amendments) applies.

GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1
friction characteristics
unique intrinsic properties of friction materials (friction elements) during friction process

Note: In this document, dynamic and static friction tests are adopted to evaluate the friction characteristics of friction elements in automatic transmission.

3.2
friction coefficient
ratio of the friction force to the force exerted on the friction element when there is or tends to be relative motion between the friction plate and the dual disc


Notes

1 The friction coefficient is classified as dynamic one and static one.

2 The dynamic and static friction coefficients are calculated using Equation (1), and the results are rounded to 3 decimals according to GB/T 8170.

(1)
where,

μ——the friction coefficient;

T——the friction torque, N.m;

n——the number of friction plates (n=3);

r——the radius of average effective friction, mm, taken as 57.4mm;

p——the surface pressure loaded on the friction surface of friction plate, kPa, taken as 785kPa;

A——the friction area of friction plate, mm2, taken as 4,434mm2.

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test equipment and preparation
5 Test procedures
6 Test data
7 Precision
8 Test report
Annex A (Informative) Dimensions and requirements of friction plate and dual disc
Annex B (Informative) Example tables of the test report
Bibliography