Rear axle in section
1 – a locking ring of a semiaxis; 2 - brake shoe; 3 – brake drum; 4 – a bolt of fastening of a wheel; 5 - guide pin; 6 - brake cylinder; 7 - brake shield; 8 - half shaft bearing; 9 - cuff half shaft; 10 – a basic cup of a spring; 11 - differential bearing; 12 - breather; 13 - differential housing; 14 - driven gear of the main gear; 15 - satellite; 16 - side gear; 17 - bolts for fastening the gearbox to the rear axle housing; 18 - bearings of the drive gear; 19 - cuff of the flange of the drive gear; 20 - flange; 21 – a nut of a leading gear wheel; 22 – mud-reflecting ring; 23 - spacer sleeve; 24 - adjusting gasket (ring); 25 - drive gear; 26 - the axis of the satellites; 27 - gearbox housing; 28 - rear axle beam; 29 - half shaft.
Design Description
The rear axle of the car is made in the form of a hollow beam, to the ends of which flanges are welded with seats for axle shaft bearings and holes for attaching brake shields. In the middle, a main gear gearbox with a differential is bolted to the beam, and from the side of the flanges, two semi-axes are inserted into the beam, transmitting torque from the gearbox to the rear wheels.
All rear axle «classical» VAZ cars (except for all-wheel drive models) unified and, depending on the model, can be equipped with a gearbox with a gear ratio of 3.9 or 4.1.
The location of the gear ratio marking on the driven gear.
The drive and driven gears of the gearbox are selected in pairs and if at least one of them is damaged, they are replaced as a set.
The drive gear is mounted on two tapered roller bearings, an elastic spacer sleeve is inserted between their inner rings. When tightening the nut on the drive gear shank, this bushing deforms, providing a preload in the bearings.
An adjusting ring is installed between the drive gear and its bearing, which determines the axial position of the drive gear.
The final drive gear is bolted to the differential housing, which is mounted on two tapered roller bearings. The preload in these bearings, as well as the gap between the teeth of the drive and driven gears, are regulated by ring nuts wrapped in split bearing beds. Inside the differential housing, two satellites sit freely on the axle, which engage with side gears.
The semi-axle with its inner end enters the splined hole of the semi-axial gear, and the outer end rests on a ball bearing that enters the beam flange and is locked there by a plate. The plate, together with the oil deflector and the brake shield, is fastened with four bolts to the beam flange. A cuff is installed in the nest of the bridge beam. From axial displacement, the bearing is fixed on the axle shaft with a locking ring.
Brake pads, a brake cylinder with a brake fluid supply pipe and a parking brake cable sheath are attached to the brake shield.
A brake drum is attached to the axle shaft flange with two guide pins.
For filling and draining oil, two plugs with conical threads are installed.