7.3. Automatic transmission

The four-stage automatic transmission with electronic control consists of the hydrotransformer, the epycyclic tooth gearing and hydraulically the operated coupling and brakes.

The torque from the engine to the transmission is transmitted through the hydrotransformer which performs function of liquid coupling and operates as automatic coupling. Also provides torque transmission at acceleration.

The tooth gearing provides advance on one of 4 transfers or the movement with a backing. Components of the tooth gearing cope brakes and clutch couplings which is put in action hydraulically. The pump located in the transmission provides necessary hydraulic pressure for work of a brake and a clutch coupling.

The control of the transmission is made by the lever of the selector having 7 provisions. Situation D provides the automatic choice of transfers from 4 forward transfers. The automatic mechanism of decrease in transfers switches transfer to the lowest if the pedal of an accelerator is pressed against the stop. This mode needs to be used when the maximum acceleration of the car is required. If the lever of the selector is in situation 3, the car will move only on the first three transfers, and in situation 2 only on the first two transfers, etc. Installation of lower transfers is desirable when braking by the engine, at the movement from biases or for prevention of the undesirable choice of the highest transfer on twisting roads.

Because of complexity of the automatic transmission, any repair has to be made at service station.