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QC/T 1125-2019 English PDF (QCT1125-2019)

QC/T 1125-2019 English PDF (QCT1125-2019)

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QC/T 1125-2019: Automotive clutch terminology and definition

This standard specifies the terms and definitions of dry friction automotive clutches and clutch operating mechanisms. This standard applies to dry friction automotive clutches and clutch operating mechanisms.
QC/T 1125-2019
QC
AUTOMOBILE INDUSTRY STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 43.040.50
T 21
Automotive clutch terminology and definition
ISSUED ON: NOVEMBER 11, 2019
IMPLEMENTED ON: APRIL 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC.
Table of Contents
Foreword ... 7
1 Scope ... 8
2 Definition of automotive clutch and clutch operating mechanism ... 8
3 Terms and definitions of clutch types ... 8
4 Terms and definitions of dry friction clutch components ... 10
5 Terms and definitions of clutch operating mechanism types ... 13
6 Terms and definitions of components of clutch operating mechanism ... 13 Appendix A (Informative) Example diagram of automotive clutch assembly ... 16 Automotive clutch terminology and definition
1 Scope
This standard specifies the terms and definitions of dry friction automotive clutches and clutch operating mechanisms.
This standard applies to dry friction automotive clutches and clutch operating mechanisms.
2 Definition of automotive clutch and clutch operating
mechanism
2.1
Automotive clutch
A component, which is located between the power source and the transmission, AND used to cut off and transmit power (hereinafter referred to as the clutch). 2.2
Clutch operation mechanism
A unit, which is connected by two or more components AND used to operate the clutch engagement and disengagement.
3 Terms and definitions of clutch types
3.1
Friction clutch
A clutch, that relies on friction between the driving and driven parts to transmit power.
3.2
Mechanically controlled clutch
A clutch, that realizes the clutch function, under the direct action of a mechanical mechanism.
3.3
Hydraulically controlled clutch
A clutch, that performs a clutch function, under the action of hydraulic pressure. 3.4
Pneumatically controlled clutch
A clutch, that realizes the clutch function, under the action of compressed air. 3.5
Dry clutch
Clutches whose friction material does not operate in any fluid.
3.6
Self-adjusting clutch
A clutch, that can automatically adjust the working pressure to keep it constant, as the clutch friction pair wears.
3.7
Single plate clutch
A clutch, which has one disc assembly.
3.8
Double plate clutch
A clutch, which has two driven plate assemblies.
3.9
Multi-plate clutch
Clutches, which have more than two driven disc assemblies.
3.10
Diaphragm spring clutch
A clutch, that uses a diaphragm spring to generate pressing force.
A part in the disc assembly, that exerts pressure on the bushing.
4.2
Cover assembly
A component, which is composed of parts such as clutch cover, pressure plate, compression spring, AND is connected to the power source, to transmit or interrupt power (see Figure A.2 and Figure A.3 for example diagrams).
4.2.1
Pressure plate
The disc-shaped part, which serves as the active friction surface of the clutch to transmit the pressing force.
4.2.2
Intermediate pressure plate
The pressure plate, between the two disc assemblies, in a double plate clutch. 4.2.3
Cover
A part, that is connected to the power source AND plays a role in fixing and supporting the compression spring.
4.2.4
Support ring
A part, that limits the axial movement of the diaphragm spring and plays a supporting role.
4.2.5
Strap
An elastic part, that connects the pressure plate to the clutch cover.
4.2.6
Diaphragm spring
A disc spring, which has a separation finger structure, to compress the friction pair and separate it.
4.2.7
Release lever
A lever, that moves the pressure plate axially and plays a separation role. 4.2.8
Release lever support
A support on clutch, for the installation of the release lever.
4.2.9
Release lever adjusting nut
Nut, which is used to adjust the height of the clutch release lever.
5 Terms and definitions of clutch operating mechanism types
5.1
Hydraulic clutch operation mechanism
A clutch operating mechanism, that transmits force and stroke hydraulically. 5.2
Mechanical clutch operation mechanism
A clutch operating mechanism, that mechanically transmits force and travel. 5.3
Hydraulic clutch operation mechanism by power assisting
Hydraulic clutch operating mechanism, which has power assisting device. 5.4
Mechanical clutch operation mechanism by power assisting
Mechanical clutch operating mechanism, which has a power assisting device. 6 Terms and definitions of components of clutch operating
Clutch slave cylinder push rod
A rod, that directly transmits the thrust and stroke of the clutch slave cylinder?€?s piston.
6.9
Hydraulic release bearing
A device, which integrates the clutch slave cylinder and release bearing. 6.10
Clutch release cable
A cable, that transmits the force and stroke, which are generated by the clutch pedal, to the release device.
6.11
Clutch servo actuator
Clutch slave cylinder, which has power assisting function.
6.12
Clutch servo actuator by vacuum
A device, that realizes the power-assisting function, through the pressure difference generated by vacuum.

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