Automatic transmission and the main transfer are placed in the uniform case cast from aluminum alloy. All unit carries the name "the transmission assembled with the main transfer and differential" or "transmission". Automatic transmission of VW 096 has four speeds and speed of a backing. Gear shifting in automatic transmission electronic. Traditionally refer to advantages of automatic transmission, first of all, more bystry and timely gear shifting. Torque transmission from transmission on forward driving wheels is carried out through half shafts and hinges of equal angular speeds (CV JOINTS). Transmission assembled can be dismantled and installed on the car without dismantle of the engine. The option of removal of a box after dismantle of the power unit assembled is possible.

PREVENTION If you have no experience or the special equipment for carrying out some operations, sufficient on that, it is better to provide repair of the automatic transmission to specialists of specialized service station.

When dismantling the mechanism of transmission it is necessary to observe purity and to be attentive to each trifle.

Before each operation be convinced available the tool, necessary for its carrying out, especially, when performing the operations demanding application of metrological means.

Automatic transmission and the main transfer are reliable units, and at observance of conditions of the correct operation and timely maintenance their repair and, respectively, dismantling are not required.

Fig. 8.63. Automatic transmission of type 096: 1 – hydrotransformer; 2, 4 – a flange of the leading gear wheel; 3 – the conducted gear wheel of the main transfer; 5 – planetary transfer; 6 – cooler of transmission liquid

The device of the automatic transmission (rear view) is shown in fig. 8.63 . Automatic transmission and the main transfer settle down in different compartments in a uniform case. The main transfer for which lubricant gipoidny oil is used is completely isolated from the automatic mechanism. Automatic transmission is greased with exclusively transmission liquid which circulation is provided with the pump. At the idle engine liquid is not pumped over by the pump.

Automatic transmission of type 096

At automatic transmission of type 096 four forward transfers and electronic control. The torque from the engine is transmitted to transmission through the hydrotransformer which represents the hydraulic clutch providing strengthening of torque owing to what the best dispersal of the car from the place is reached or at the movement with a small speed.

PREVENTION Towage of the car Volkswagen with faulty automatic transmission in conditions when forward wheels of the car are in contact with the road, can lead to destruction of transmission because of possible lack of lubricant in it.

One more feature of automatic transmission — presence of a payment of self-diagnostics at the block of electronic control. The payment of self-diagnostics provides tracking of normal parameters of work of transmission, finds the parameters which are beyond the set limits and other refusals and also brings the found refusals in memory and stores information for the subsequent viewing. At specialized service stations the special electronic equipment is used to reading of information on refusals which is contained in memory.

Hydrotransformer

The hydrotransformer represents hydraulic coupling. The engine brings curved blades of a krylchatka of the pump located in the case into rotation. At rotation of blades the stream of transmission liquid which transfers rotation to the turbine wheel connected to the planetary mechanism of transmission is created.

Strengthening of torque is provided with the central system of blades in the hydrotransformer — the reactor. The reactor is installed on the coupling of a free wheeling. The blades of the reactor bent on a profile redirect a liquid stream from a krylchatka to various sites of the turbine. At higher speeds of rotation when distinction of speeds of rotation of the pump and turbine is small, the reactor rotates freely and strengthening of torque stops.

Planetary transfer

Work of transmission is based on the principles of a hydromechanics. Without supportive applications the hydrotransformer cannot provide strengthening of the torque necessary for all road conditions. Torque transmission from the engine is provided with the planetary transfer transferring rotation at various transfer numbers.

Fig. 8.64. Gear wheels of the automatic transmission: 1 – transmission case; 2 – basis of a planetary gear wheel; 3 – leader; 4 – the conducted disk; 5 – mechanism of a free wheeling; 6 – solar gear wheel; 7 – driving case; 8 – drive of a solar gear wheel; 9 – driving gear wheel; 10 – coupling 3-y/4-y transfers; 11 – coupling of 1-y/3-y transfer; 12 – coupling of a backing; 13 – the conducted disk; 14 – drive plate; 15 – converter

The transmission liquid which is under pressure includes and turns off a number of hydrocouplings of 10 (fig. 8.64) and brakes in planetary transfer, than change of transfer number is reached. Liquid pressure in system is supported by the pump, and the direction of the stream of liquid influencing various couplings and brake mechanisms is carried out by means of the block of valves.

Block of valves

Fig. 8.65. Elements of control of the transmission: 1 – index of the choice of transfers; 2 – rotary handle; 3 – switch; 4 – electronic control unit; 5 – block of valves; 6 – lamp of the index of transfers; 7 – electromagnetic valve; 8 – speed sensor; 9 – transmission case; 10 – multipurpose switch; 11 – parking brake; 12 – сапун; 13 – index of level of oil (probe); 14th cover; 15 – guide of the index of level of oil; 16 – oil pallet; 17 – oil pump

Gear shifting is carried out by the selector lever put in action by the driver. The lever is mechanically connected with the block of valves 5 (fig. 8.65) and puts the valve of the manual drive in action. The valve of the manual drive carries out direct gear shifting. Besides, gear shifting is made by means of the electronic block.

Electronic control unit

The electronic block operates work of transmission depending on traffic conditions and provides higher maneuverability of the car. The stream of transmission liquid and its pressure are regulated by means of seven electromagnetic valves. The electronic control unit established under a back seat includes windings of electromagnetic valves, chooses transfer number and displaces the switching moment in response to such entrance data as speed of the car and loading of the engine.

The electronic control unit can work according to two various programs, depending on the choice by the driver of the Sport or Economy modes. In the Sport mode the moment of switching of transfer is displaced in such a way that inclusion following, raised, transfers is late owing to what the torque increases, dynamics of dispersal and maneuverability of the car improve. The Economy mode is programmed so that inclusion following, raised, transfers happens immediately, according to driving conditions owing to what profitability increases.

In the absence of management from the electronic block transmission passes into the mode operated by the valve of the manual drive located in the block of valves (limp-home mode). There is a possibility of inclusion of the 1st transfer or a backing (situation Revers). At any other situation Drive the hydraulic mechanism includes only the 3rd transfer.

PREVENTION The electronic control unit is subject to obligatory reprogramming in case replacement or adjustment of a butterfly valve, a potentiometer of a butterfly valve, a cable of the drive of a butterfly valve, and also replacement of the engine or the electronic control unit with transmission were made.

Main transfer

The main transfer consists of a shaft of the selection of power given to rotation by teeths of external gear wheels of planetary transfer and the differential with the conducted gear wheel transferring torque to half shafts. The differential provides rotation of forward driving wheels with different speeds that is necessary at turn of the car when wheels pass different distances.

Marking of transmission and units

Fig. 8.66. Alphabetic codes and date of production of automatic transmission (1) the ACD code and the numerical designation 03059 corresponding to date of production: 3rd day (03) of the 5th month (05) 1989 (9)

Number and date of production are applied on a case of automatic transmission. Options of execution of transmission and the hydrotransformer are specified by alphabetic references. Alphabetic codes and date of production are put in the top part of a case (fig. 8.66) .

Fig. 8.67. The alphabetic code applied on a hydrotransformer casing

The hydrotransformer is marked by alphabetic codes (fig. 8.67) . These codes are also applied with a shtampovaniye on a case of transmission (fig. 8.68) .

Fig. 8.68. The alphabetic code applied on a transmission case