Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

The transmission co-ordinates speed of rotation of the engine and driving wheels thanks to various transfer numbers. Thus the driver influences speed of movement, possibility of acceleration and ability of the car to overcome liftings. Depending on the established transmission the driver can choose most suitable of five transfers or give switching to an automatic transmission.

Mechanical transmission (КП)

The twisting moment from the engine through coupling arrives on a primary shaft of a transmission. On this primary or приводном to a shaft it is located six cogwheels (including a reverse gear) which are in constant gearing with six gear wheels on secondary to a shaft. These gear wheels can freely rotate, until then while one of them at inclusion of certain transfer will not incorporate to a corresponding gear wheel on primary to a shaft. The parity of number of teeths of the corresponding pair gear wheels forms necessary transfer number. Audi 80 it is supplied, as well as all cars, «completely synchronised» transfers for movement by a forward course. The reverse gear for gnash prevention at its inclusion is in addition synchronised even.

Gear wheels on primary and secondary to a shaft are located on needle bearings. Therefore between shaft and gear wheels there is no rigid connection. Gear wheels remain, as is already mentioned, always in gearing.

At a gear change connection not between gear wheels, and between a gear wheel and shaft is formed. To synchronise shaft and gear wheel turns, the following reception is used: one part of a shaft by means of frictional elements slides against a part of other shaft.

Because of a friction faster shaft is braked, until then while at synchronous movement there is no possible a creation of connection transferring a twisting moment. As fractions of a second the driver does not need to "tear" with violence the gear change handle, especially in the conditions of start of the cold engine at even dense трансмиссионном oil nevertheless are necessary for synchronisation.

Problems with a gear change

If transfers join with great difficulty or after a long trip switching becomes heavy the reason of these malfunctions, most likely, is coupling, instead of a transmission (the list of malfunctions in the head Coupling see). The regulation of the mechanism of switching described more low serves only to to result the switching lever in a correct position and by that to optimise a switching course.

Gear change adjustment

At the left: the distance between the spherical hinge and the case should be identical both on the right, and at the left.

On the right: for regulation it is necessary to weaken under the car the screw designated by an arrow on system of draughts and control levers the gear change mechanism.