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QC/T 1202-2024Wet dual clutch assembly for automatic transmission of passenger vehicles (English PDF)

乘用车自动变速器用湿式双离合器总成

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

July 5, 2024

Implementation date

January 1, 2025

Scope

QC/T 1202-2024 is the English-translated version of 乘用车自动变速器用湿式双离合器总成.

QC/T 1202-2024 covers wet dual clutch assemblies for the automatic transmissions of passenger vehicles. It specifies terms and definitions, symbols, technical requirements and test methods, and states that it has no normative references.

Clause 3 defines the wet dual clutch as an assembly of a drive plate, clutch hubs, steel plates, friction plates, clutch working pistons and return springs, with one driving part and two driven parts, cooled and lubricated by oil.

The basic requirements in Clause 4 call for the assembly to be made to approved drawings and technical documents, with clear markings and surfaces free of defects such as bumps and scratches.

The performance requirements fix the maximum clutch transmission torque at not less than 1.2T and the maximum torque hysteresis at not more than 0.15T, where T is the clutch design input torque in newton metres; they require that at an oil temperature of (45 plus or minus 5) degrees C the dynamic friction coefficient show no negative gradient within a speed difference of 1000 r/min; and they cap drag torque under each working condition at 6 newton metres.

In the pressure pulse test each of the two clutches is cycled 500,000 times, after which each shall still function normally, all parts and welds shall be free of cracks and plastic deformation, and torque transmission capacity shall be retested.

Slip wear durability is a further performance requirement. Clause 5 holds the test methods and informative Annex A shows the structure of a wet dual clutch.

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Document preview — QC/T 1202-2024

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword3
1 Scope4
2 Normative references4
3 Terms and definitions4
4 Technical requirements6
5 Test methods7
Annex A (informative) Wet dual clutch structure15

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority of this document shall not be held responsible for identifying any or all such patent rights.

1 Scope

This document specifies the terms and definitions, symbols, technical requirements and test methods for wet dual clutch assemblies for automatic transmission of passenger vehicles.

This document applies to wet dual clutch assemblies for automatic transmission of passenger vehicles.

2 Normative references

This document has no normative references.

3 Terms and definitions

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

3.1 Wet dual clutch

A clutch that consists of a drive plate, clutch hubs, steel plates, friction plates, clutch working pistons and return springs, has an active part and two driven parts, and is cooled and lubricated by oil.

NOTE: The structure of a wet dual clutch is shown in Figure A.1 in Annex A.

3.2 Drive plate

A connecting component that is connected to the clutch outer hub and transmits the engine torque to the wet dual clutch assembly.

4 Technical requirements

4.1 Basic requirements

4.1.1 The wet dual clutch assembly shall comply with the requirements of this document and be manufactured according to the drawings and technical documents approved by the prescribed procedures.

4.1.2 The markings of the wet dual clutch assembly shall be clear, and there shall be no defects such as bumps and scratches on the surface.

4.2 Performance requirements

4.2.1 Torque transmission capacity

The maximum value of clutch transmission torque shall not be less than 1.2T.

NOTE 1: T represents the clutch design input torque, in Newton meters (N·m).

NOTE 2: Unless otherwise specified, the performance requirements of the first clutch and the second clutch are the same, the same below.

4.2.2 Torque hysteresis

The maximum value of torque hysteresis shall not be greater than 0.15T.

4.2.3 Dynamic friction coefficient

At an oil temperature of (45 ± 5) °C, the dynamic friction coefficient within a speed difference of 1000 r/min shall not have a negative gradient.

4.2.4 Drag torque

The drag torque under each working condition shall not be greater than 6 N·m.

4.2.5 Pressure pulse

According to the specified test conditions, after the first clutch and the second clutch are tested 500,000 times respectively, the function of each clutch shall be normal. After the test, all parts and welding positions shall be free of cracks and plastic deformation; the retest results of the clutch torque transmission capacity shall meet the requirements of 4.2.1.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 22 pages — is available in the English PDF.

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GB/T 41607-2022|GB/T 35472.1-2017|GB/T 35472.2-2017|GB/T 35472.3-2017|GB/T 35472.4-2017|GB/T 35472.5-2017

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