Front wheel drive (VAZ-2121)

Torque is transmitted to the front wheels from the front drive axle through two joints connected to each other by shaft 4 (Fig. 3-85). Outer joint (constant velocity joint) consists of a housing 13, a collar 11, a separator 8 with balls 10, a locking 12 and a thrust 7 ring. The collar 11 is connected to the housing 13 through balls that enter the grooves of the collar, made along the radius, and into the grooves of the housing. The collar is mounted on the splines of the shaft 4 until it stops in the ring 7 and is fixed by the locking ring 12. This ring in the compressed position freely passes through the splined opening of the collar 11, which allows the joint and shaft 4 to be connected and disconnected.



The hinge is protected from dirt and moisture by cover 6, which in turn is protected from mechanical damage by casing 5. The protective cover is held on shaft 4 and on the hinge housing by clamping clamps 9. The internal hinge differs in its design from the external one in that it has straight grooves. Axial movement of the hinge parts in the housing is limited by wire retainer 2.

The internal hinge parts and individual lots of the external hinge are sorted into several assembly groups by size, therefore, during repair, it is not allowed to replace any one hinge part. It must be replaced as a whole. Protective covers 5 and covers 6, clamps 9, ring 3 and retainer 2 can be replaced separately.