GB/T 35472.4-2017Test method for friction element of wet automatic transmission—Part 4: High-speed stepped power test method (English PDF)

Foreword

GB/T 35472 "wet automatic transmission friction element test method" is divided into the following seven sections.

--- Part 1. Terms and definitions;

--- Part 2. SZBL friction test machine use guide;

--- Part 3. Low speed power increment test method;

--- Part 4. High-speed power increment test method;

--- Part 5. Durability test methods;

--- Part 6. Test methods for the relationship between friction performance and pressure, speed and temperature;

--- Part 7. Belt friction test method.

This section GB/T 35472 Part 4.

This section drafted in accordance with GB/T 1.1-2009 given rules.

1 Scope

GB/T 35472 provisions of this part of the SZBL friction test machine at 6000r/min power increment test test set preparation, typical test conditions and parameters, test procedures, data acquisition and results reporting.

This section applies to evaluate wet friction element with the power level changes. This section does not apply to evaluate the initial friction coefficient or run-in characteristic.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 35472.1 wet automatic transmission friction element test methods - Part 1: Terms and definitions

GB/T 35472.2 wet automatic gearbox friction element test methods - Part 2: SZBL friction test machine use guide

3 Test equipment

The test equipment is a SZBL type friction tester with static engagement device. Its performance and accuracy should be consistent with the provisions of GB/T 35472.2.

The configuration of its inertia should be consistent with the provisions of Table 1.