Rear axle
1 - axle shaft; 2 – a bolt of fastening of a wheel; 3 - guide pin; 4 - oil deflector; 5 – brake drum; 6 - axle bearing; 7 - locking ring; 8 – rear axle beam flange; 9 - axle shaft seal; 10 – rear axle beam; 11 - bearing mounting plate; 12 - rear brake shield; 13 - half shaft guide; 14 - adjusting nut; 15 - differential box bearing; 16 - bearing cover; 17 - breather; 18 - satellite; 19 - driven gear; 20 - half shaft gear; 21 - adjusting ring of the drive gear; 22 - spacer sleeve; 23 - bearings of the drive gear; 24 – an epiploon of a leading gear wheel; 25 - mud deflector; 26 - flange; 27 - oil deflector; 28 - crankcase of the rear axle gearbox; 29 - drive gear; 30 - the axis of the satellites; 31 - adjusting washer; 32 - differential box
Rear axles of VAZ-2101 cars; VAZ-2102 and their modifications have the same device and are completely unified, with the exception of gearboxes, the main gear of which has a different gear ratio. For the VAZ-2101 and its modifications, it is 4.3, and for the VAZ-2102 - 4.44. To distinguish gearboxes for «station wagon», the letter is applied on their neck «at».
A gearbox 28 is attached to the beam 10 of the rear axle, in which the main gear and differential are located. The leading 29 and the driven 19 gears of the main gear are paired in terms of contact and noise, therefore, if one of them is damaged, both are replaced. Between the inner rings of the bearings 23 of the drive gear there is a spacer sleeve 22, which, deforming when the drive gear nut is tightened, provides a preload in its bearings.
An adjusting ring 21 is installed between the end face of the drive gear and the inner bearing, which determines the correct position of the drive gear relative to the driven gear.
The driven gear of the main gear is attached to the flange of the differential box 32, which rotates on two bearings 15. The preload in these bearings, as well as the gap between the teeth of the drive and driven gears, is regulated by nuts 14, wrapped in split bearing beds. Side gears 20 are installed in the cylindrical sockets of the differential box and rest on the box through the support washers 31. By selecting the washers for thickness, a lateral clearance of 0.0–0.1 mm is set between the teeth of the satellites and side gears.
Axle shaft 1 with its inner end enters the splined hole of the side gear, and its outer end rests on a ball bearing 6, which is fixed to the half shaft with a locking ring 7. The half shaft bearing is sealed in the rear axle beam seat from the inside with a self-compressing gland 9, and outside - with a rubber ring sandwiched between brake shield 12 and rear axle beam flange. The bearing is fixed in the seat of the beam by plate 11, which, together with the oil deflector 4 and the brake shield, is fastened with four bolts to the beam flange.