Automotive transmission type
Automobile automatic transmissions are commonly used in four types: hydraulic automatic transmission (AT), mechanical continuously variable transmission (CVT), electronically controlled automatic transmission (AMT), and dual clutch transmission (DSG). At present, AT is the most widely used, and AT is almost synonymous with automatic transmission.
The AT is composed of a hydraulic torque converter, a planetary gear and a hydraulic operating system. The variable speed torque is realized by a combination of hydraulic transmission and gear. Among them, the hydraulic torque converter is the most important component. It consists of components such as pump wheel, turbine and guide wheel, and it also has the function of transmitting torque and clutch.
Compared with AT, CVT eliminates the complicated and cumbersome gear combination transmission, but two sets of pulleys for variable speed transmission. The shift is performed by changing the contact radius of the drive wheel and the driven wheel belt. Since the gear transmission is cancelled, the transmission ratio can be changed at will, the shifting is smoother, and there is no jump feeling of shifting.
The AMT is a stepped automatic transmission like the automatic hydraulic transmission (AT). On the basis of the ordinary manual transmission, it is equipped with an electric device controlled by a microcomputer to replace the separation and engagement of the clutch that has been manually operated, and the gear selection and shifting action of the transmission to realize automatic shifting.
The DSG gearbox is clearly different from the conventional automatic gearbox. The DSG did not use a hydraulic torque converter from the beginning. The transmission is not based on the traditional concept of automatic transmissions. Engineers who design DSG have taken a revolutionary new technology path, cleverly combining the flexibility of manual transmissions with the convenience of traditional automatic transmissions. together.