Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

The back bridge

For front-wheel and all-wheel drive models there was a necessity for the new concept of the back bridge in connection with the big luggage compartment and a leaning back back of a back seat. The uniform structure of a body has formed a basis for development as бесdrive, and the leading back bridge in models with a full drive.

For front-wheel models the back bridge with a suspension bracket of wheels on the longitudinal levers connected by a beam and strengthened on a body has been chosen. Such design consists of two rigid on a bend and torsion of longitudinal levers of the tubular section connected among themselves rigid on a bend, but the P-shaped cross-section beam working on torsion. The additional stabilizer is located across the car at an angle to a beam of the bridge and шарнирно is attached to a body. Thereby high cross-section rigidity of the bridge and optimum course stability is reached.

Amortisation racks transfer vertical forces to a body. Springs are located as it is possible more low not to conceal volume of a luggage compartment.

Such constructive decision of the back bridge with a suspension bracket of wheels on the longitudinal levers connected by a beam, strengthened on a body, provides that at joint turn of an axis of levers of both wheels the bridge behaves as the bridge with a suspension bracket of wheels on longitudinal levers, and at beam twisting – as the bridge with a suspension bracket of wheels on diagonal levers.

The back bridge of all-wheel drive models Audi 80 is supplied by directing system of a suspension bracket of wheels with dual cross-section levers.

The directing system of a suspension bracket consists accordingly of two triangular cross-section levers with the additional vertical lever. Shock-absorbers and springs are collected in compact amortisation racks.

Position of the top cross-section levers over wheels helps to place the longitudinal levers located more low in coming out wheel niches that in turn is the precondition for the optimum form of a luggage compartment. The reducer of the back bridge is attached by bolts to a stretcher which, in turn, is attached by bolts to a body by means of pillows.

The forward bridge

Known already forward bridge with a suspension bracket of wheels on amortisation racks was in the changed form is transferred with Audi a compartment, and also from model-predecessor. Additional application of elastic elements from полиуретана does possible convenient «проглатывание» even the big movement of a body.

The stabilizer of cross-section stability attached to both cross-section levers, considerably reduces a list arising in turn, and also "swallows" the blows received by a suspension bracket at arrival on roughness.

In comparison with the previous model the track of the forward bridge is expanded on 38 mm.