Standard No.:	QC/T 1202-2024
English Name:	Wet dual clutch assembly for automatic transmission of passenger vehicles
Chinese Name:	乘用车自动变速器用湿式双离合器总成
Chinese Classification:	T22    Bearing system
Professional Classification:	QC    Professional Standard - Automobile
Source Content Issued by:	Ministry of Industry and Information Technology
Issued on:	2024-07-05
Implemented on:	2025-1-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	7500 words
Translation Price(USD):	225.0
Delivery:	via email in 1~3 business day

QC/T 1202-2024 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 of wet dual clutch assembly for automatic transmission of passenger vehicles. This document is applicable to the wet dual clutch assembly for automatic transmission of passenger vehicles. 2 Normative references No normative references are listed in this document. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 wet dual clutch clutch that composed of drive plate, clutch hub, steel plate, friction plate, clutch working piston and return spring, etc., and has an active part and two driven parts, and is cooled and lubricated by oil Note: The structure of wet dual clutch is shown in Annex A, Figure A.1. 3.2 drive plate connecting part for connection of the clutch hub and to transfer engine torque to the wet dual clutch assembly 3.3 clutch hub connecting part that composed of clutch outer hub and inner hub, respectively connecting drive plate with steel plate and connecting friction plate with transmission to transfer the power 3.4 clutch working piston a part that seals the clutch pressure chamber and binds the steel plate to the friction plate under pressure 3.5 drag torque torque generated by friction and oil stirring of clutch in the fully separated state 3.6 input speed speed of clutch active end, that is, the speed of drive plate, clutch outer hub and steel plate 3.7 output speed speed of clutch driven end, that is, the speed of clutch hub and friction plate 3.8 cooling lube flow oil flow, distributed by control, provided to the clutch cooling lubrication through the clutch cooling oil passage inlet 3.9 clutch pressure oil pressure, distributed by control, provided to the clutch pressure chamber through the clutch pressure oil passage inlet 3.10 clutch kisspoint pressure clutch pressure that overcomes the clutch spring force or chamber back pressure, so that the clutch engages and begins to transmit torque 4 Technical requirements 4.1 Basic requirements 4.1.1 The wet dual clutch assembly shall meet the requirements of this document and be manufactured in accordance with the drawings and technical documents approved through the specified procedures. 4.1.2 The markings of 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 transmission torque of the clutch shall not be less than 1.2T. Note 1: T indicates the design input torque of the clutch, in N·m. Note 2: Unless otherwise specified, the performance requirements of the first clutch and the second clutch are the same, the same as below. 4.2.2 Torque hysteresis The maximum torque hysteresis shall not be greater than 0.15T. 4.2.3 Dynamic friction coefficient The dynamic friction coefficient shall not have a negative gradient at oil temperature of (45±5)℃, when the velocity difference is less than 1 000r/min. 4.2.4 Drag torque The drag torque shall not be greater than 6N·m under each working condition. 4.2.5 Pressure pulse According to the specified test conditions, the clutch function shall be normal after the first clutch and the second clutch have been tested for 500 000 times respectively. After the test, each part and welding position shall have no crack and plastic deformation; the result of the retest of the torque transmission capacity of the clutch shall meet the requirements of 4.2.1. 4.2.6 Wear durability According to the specified test conditions, the clutch corresponding to the first gear shall be tested for 10 000 times, and the clutch corresponding to the reverse gear shall be tested for 1 000 times, and the clutch function shall be normal and the friction plate shall not be ablated. The retest result of the torque transmission capacity of the clutch shall not be less than 1.15T. Note: If the first gear and the reverse gear correspond to the same clutch, the number of times of wear of the clutch shall be 11 000. 4.2.7 High speed blasting After the test, each part and welding position shall have no crack and plastic deformation. 4.2.8 Torsional fatigue According to the specified test conditions, after the drive plate have been tested for 1 million times, and the clutch outer hub and inner hub have been tested for 500 000 times, each part and welding position shall have no crack and plastic deformation.

Contents Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Technical requirements 5 Test methods Annex A (Informative) Wet dual clutch structure