QC/T 1077-2017Terms and definitions for classification of automotive automatic transmissions (English PDF)
汽车自动控制变速器分类的术语及定义
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
April 12, 2017
Implementation date
October 1, 2017
Scope
QC/T 1077-2017 is the English-translated version of 汽车自动控制变速器分类的术语及定义.
QC/T 1077-2017 is the vocabulary that names and classifies the automatic transmissions of cars; clause 1 applies it where the internal combustion engine is the sole source of power.
Clause 2 defines the four families with their abbreviations: the automatic transmission (AT), which combines hydraulic and mechanical drive to shift by itself, the dual clutch transmission (DCT), whose two sets of clutches keep power from being interrupted, the continuously variable transmission (CVT), which changes ratio continuously, and the automatic manual transmission (AMT), built on a manual gearbox.
Clauses 3 to 6 break each family down: ATs by the type of gear drive; DCTs by clutch actuation (electro-hydraulic or electric motor), by shift actuation, by oil pump form and by main oil circuit pressure, high pressure being above 35 bar and low pressure 35 bar or less; CVTs, including the version with a sub-transmission mechanism; and AMTs by hydraulic, electric or pneumatic clutch and gear selecting drive. Issued on 12 April 2017, it has applied since 1 October 2017.
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Document preview — QC/T 1077-2017
National Standard of the People's Republic of China
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword7
- 1 Scope8
- 2 Automotive automatic transmission classifications8
- 3 Automatic transmission classifications8
- 4 Dual clutch transmission classifications9
- 5 Continuously variable transmission classifications11
- 6 Automatic manual transmission classifications12
1 Scope
This Standard specifies the terms and definitions of automotive automatic transmission classifications.
This Standard applies to the automotive automatic transmission where the internal combustion engine is the sole source of power.
2 Automotive automatic transmission classifications
2.1 Automatic transmission, AT
A transmission using a combination of hydraulic transmission and mechanical transmission to achieve automatic shifting.
2.2 Dual clutch transmission, DCT
An automatic shifting transmission using two sets of clutches to control power interruption and transmission to achieve no-power interruption.
2.3 Continuously variable transmission, CVT
An automatic transmission that continuously changes the transmission ratio.
2.4 Automatic manual transmission, AMT
An automatic transmission with automatic shifting function based on a manual transmission.
3 Automatic transmission classifications
3.1 Classification by the type of transmission gear drive
3.1.1 Fixed axis gear drive type automatic transmission
An automatic transmission using fixed axis type gear drive.
4 Dual clutch transmission classifications
4.2.2 Dual clutch transmission with electro-hydraulic actuator of clutch
A dual clutch transmission where the dual clutch drive actuation system uses the hydraulic pressure established by the motor drive to achieve clutch separation and combination, thereby realizing power interruption and transmission.
4.2.3 Dual clutch transmission with electrical motor actuator of clutch
A dual clutch transmission where the dual clutch drive actuation system uses a motor-driven mechanical structure to achieve clutch separation and combination, thereby realizing power interruption and transmission.
4.3 Classification by the execution mode of shifting mechanism
4.3.1 Dual clutch transmission with hydraulic shifting actuator
A dual clutch transmission using hydraulic drive to control the transmission shift actuator for gear shifting.
4.3.2 Dual clutch transmission with electrical motor shifting actuator
A dual clutch transmission using a mechanical actuator of a motor-driven transmission for gear shifting.
4.4 Classification by the main oil circuit pressure of hydraulic system
4.4.1 Dual clutch transmission with high pressure system
A dual clutch transmission with a maximum pressure of greater than 35 bar for the main oil circuit in the hydraulic system.
4.4.2 Dual clutch transmission with low pressure system
A dual clutch transmission with a maximum pressure of not greater than 35 bar for the main oil circuit in the hydraulic system.
4.5 Classification by the drive oil pump form
4.5.1 Dual clutch transmission with mechanical oil pump
A dual clutch transmission using a mechanical oil pump to establish oil […]
6 Automatic manual transmission classifications
6.1 Classification by the execution mode of clutch drive
6.1.1 Hydraulic clutch automated mechanical transmission
An automatic manual transmission that separates and combines the clutch by means of hydraulic drive.
6.1.2 Electric clutch automated mechanical transmission
An automatic manual transmission that separates and combines the clutch by means of a motor-driven mechanical mechanism.
6.1.3 Pneumatic clutch automated mechanical transmission
An automatic manual transmission that separates and combines the clutch by means of pressurized gas drive.
6.2 Classification by the gear selecting and gear shifting drive mode
6.2.1 Automated mechanical transmission with hydraulic gear selecting and gear shifting actuator
An automatic manual transmission that performs gear selecting and gear shifting operation on the gear selecting and gear shifting mechanism by means of hydraulic drive.
6.2.2 Automated mechanical transmission with electric gear selecting and gear shifting actuator
An automatic manual transmission that performs gear selecting and gear shifting operation on the gear selecting and gear shifting mechanism by means of a motor-driven mechanical mechanism.
6.2.3 Automated mechanical transmission with pneumatic gear selecting and gear shifting actuator
An automatic manual transmission that performs gear selecting and gear shifting operation on the gear selecting and gear shifting mechanism by means of pressurized gas drive.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.
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