3.3.1. General description

Fig. 3.86. The automatic transmission (cars with the drive on two wheels): 1 – drive plate; 2 – hydrotransformer coupling (hydrotransformer); 3 – hydrotransformer; 4 – leading shaft; 5 – oil pump; 6 – a drum of the coupling of live broadcast which is used as a rotor of the sensor of speed of the leading shaft; 7 – coupling of live broadcast; 8 – mechanism of parking blocking; 9 – leading gear wheel; 10 – holder of the planetary mechanism; 11 – brake of transfer of a backing and first transfer; 12 – gear wreath; 13 – long satellite of planetary transfer; 14 – unilateral coupling No. 2; 15 – brake of the second transfer; 16 – unilateral coupling No. 1; 17 – a brake of the raising and 2nd transfer; 18 – intermediate shaft; 19 – coupling of the forward course; 20 – coupling of inclusion of a backing; 21 – back solar wheel; 22 – forward solar wheel; 23 – short satellite of planetary transfer; 24 – intermediate shaft; 25 – the conducted gear wheel; 26 – differential box; 27 – main transfer; 28 – the sensor of speed of the car speed sensor conducted the shaft / leader a gear wheel

The automatic transmission completely automatic with electronic control has three transfers of the forward course and the raising transfer (O/D) and one transfer of a backing.

The hydrotransformer of the 3rd element, one-stage and two-phase, is equipped with the mechanism of computer-controlled blocking.

The mechanism of gear shifting consists of planetary transfer, 3 multidisk couplings, 3 multidisk brakes and 2 unilateral couplings.

The hydraulic mechanism of management consists of the block of valves, the electromagnetic valve of regulation of pressure (the linear solenoid), 2 solenoids of switching, the electromagnetic valve of blocking of the hydrotransformer and the electromagnetic valve of synchronization of operation of the mechanism of gas distribution. The optimum pressure in system corresponding to torque of the engine is supported by the electromagnetic valve of regulation of pressure depending on the operating signal from the module of management of transmission (TCM). It allows to operate pressure in the pipeline with high precision according to the engine capacity and traffic conditions, to provide smoothness of the movement and high efficiency.

The control system of couplings serves for inclusion of the 3rd and 4th transfer. This control system of couplings of inclusion of transfers provides optimum performance of the transmission.

– When switching with the 3rd to the 4th transfer for adjustment of pressure of working liquid at switching off of the coupling of the forward course the electromagnetic valve of synchronization which carries out switching of hydraulic channels is used.

– When switching with the 4th to the 3rd transfer for adjustment of pressure of working liquid at turning on of the coupling of the forward course the electromagnetic valve of synchronization which carries out switching of hydraulic channels is used

– When switching with the 3rd to the 4th transfer with an open butterfly valve for adjustment of pressure of working liquid at switching off of the coupling of the forward course adaptive regulation is used that provides compensation of time of switching of the solenoid of synchronization at each gear shifting.

– When switching with the 4th to the 3rd transfer for adjustment of pressure of working liquid at turning on of the coupling of the forward course adaptive regulation is used that provides compensation of pressure of working liquid at each gear shifting.

Use of planetary transfer and control system of couplings of switching simplified a design and allowed to receive the easy and compact transmission.

Adaptive regulation of pressure in the pipeline provides optimum time of switching at each switching with an open butterfly valve. At detection of increase in time of switching pressure in the pipeline increases. To the contrary, if time of switching decreases, then also pressure in the pipeline decreases.