QC/T 1202-2024 English PDF (QCT1202-2024)

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QC/T 1202-2024: Wet dual clutch assembly for automatic transmission of passenger vehicles
QC/T 1202-2024
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.020.50
CCS T 22
Wet dual clutch assembly for automatic transmission of
passenger vehicles
ISSUED ON: JULY 19, 2024
IMPLEMENTED ON: JANUARY 01, 2025
Issued by: Ministry of Industry and Information Technology of the People's
Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Technical requirements ... 6
5 Test methods ... 7
Annex A (informative) Wet dual clutch structure ... 15
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.
This document was proposed by and shall be under the jurisdiction of National
Technical Committee of Auto Standardization (SAC/TC 114).
Drafting organizations of this document: China First Automobile Co., Ltd., Zhuhai
CNC Driveline Technology Co., Ltd., Maomao (Chongqing) Automobile Drive System
Co., Ltd., HYCET Transmission Technology Hebei Co., Ltd., Ningbo Geely Luoyou
Engine Parts Co., Ltd., BYD Auto Industry Co., Ltd., Zhejiang Kema Friction Materials
Co., Ltd., Hefei University of Technology, Zhejiang Borry Auto Parts Co., Ltd.,
Dongfeng Commercial Vehicle Co., Ltd., Anhui Jianghuai Automobile Group Co., Ltd.,
Wuhu Dajie Clutch Co., Ltd., Rizhao Pra-wolf Machinery Manufacturing Co., Ltd.,
Hubei Tri-Ring Clutch Co., Ltd., Cangzhou Juqing Auto Parts Co., Ltd., Zhejiang Kete
Auto Parts Co., Ltd., Wenzhou Anzheng Auto Parts Co., Ltd., Hangzhou Kangxin
Bearing Manufacturing Co., Ltd.
Main drafters of this document: Liu Weidong, Li Xiaojian, Xu Zhan, Liao Liufan, Chen
Zongtie, Ji Xiaohui, Xie Chi, Si Honglai, Yan Zhengfeng, Chen Gaoqing, Zhou Bangyu,
Wang Panzhen, Wu Yajun, Wang Jiyue, Fan Xuelai, Zhao Xuesong, Zhou Fei, Jiang
Sen, Cao Jian, Ma Chongjiang, Huang Zunguo, Wu Jiang, He Guanhou, Zhang Linchun,
Zhang Bo, Cui Qinqin, Ni Songfu, Chen Zhengru, Tang Shenyao.
Wet dual clutch assembly for automatic transmission of
passenger vehicles
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.
3.3
clutch hub
Clutch pressure corresponding to the clutch engagement and torque transmission when
overcoming the clutch spring force or cavity back pressure.
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) ℃, 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.
4.2.6 Slip wear durability