QC/T 316-2017Bench test methods for fatigue strength of automotive service brakes (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Directives for standardization - Part 1: Structure and drafting of standards".

This Standard replaces QC/T 316-1999 "Bench Test Methods of Fatigue Strength for Automobile Service Brake". Compared with QC/T 316-1999, the main changes in this Standard are as follows.

- modified the standard layout format so as to comply with GB/T 1.1 layout requirements;

- listed the symbols involved in the standard separately (see Clause 2 of this Edition);

- combined test equipment and test conditions into test related requirements (see Clause 3 of this Edition, Clause 2 and Clause 3 of Edition 1999);

- added requirements for brake pressure increase and decrease rates (see 3.1.2 of this Edition);

- added brake torque calculation method for blue-axis plated passenger car (see 3.2.2 of this Edition);

- added brake duration (see Figure 1 of this Edition, 3.5 of Edition 1999);

- added test cycle (see 4.2 of this Edition);

- added brake torque stabilization time (see Figure 1 of this Edition);

- deleted the chapter on test equipment and operation methods, and combined related content into the test methods (see Clause 4 of this Edition);

- deleted Annex A and Annex B.

1 Scope

This Standard specifies test related requirements and test methods of automobile service brake fatigue strength bench test. This Standard is applicable to automobile service brake assembly.

2 Symbols

The following symbols apply to this Standard. Ga. vehicle full load mass, in kilograms (kg). Gf. front axle (shaft) full load mass, in kilograms (kg). Gr. rear axle (shaft) full load mass, in kilograms (kg). H. vehicle full load center of mass, in meters (m).

Jc. brake deceleration required by the test, in meters per square second (m/s2). L - vehicle wheelbase, in meters (m).

Mf. brake torque calculation for a front brake in cattle/meter (N·m).

Mm. brake torque calculation for a middle axle brake, in cattle/meter (N·m).

Mr. brake torque calculation for a rear axle brake, in cattle/meter (N·m). r. tire dynamic rolling radius, in meters (m). beta. front and rear brake force distribution ratio design value. beta 1. design value of brake force distribution ratio between front axle and middle axle of triaxial dumpling passenger car. beta 2. design value of brake force distribution ratio between front axle and rear axle of triaxial dumpling passenger car. […]