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Fig. 23: Rear suspension components: 1. Lower longitudinal rod. 2. Lower suspension spring isolator. 3. Lower suspension spring support cup. 4. Compression buffer. 5. Upper longitudinal rod mounting bolt. 6. Upper longitudinal rod mounting bracket. 7. Suspension spring. 8. Compression buffer support. 9. Upper spring gasket race. 10. Upper spring isolator. 11. Upper suspension spring support cup. 12. Pressure regulator drive lever stand. 13. Pressure regulator drive lever rubber bushing. 14. Shock absorber mounting stud washer. 15. Shock absorber eye rubber bushings. 16. Rear shock absorber mounting bracket. 17. Additional compression buffer. 18. Spacer sleeve washer. 19. Lower longitudinal rod spacer sleeve. 20. Lower longitudinal rod rubber sleeve. 21. Lower longitudinal rod mounting bracket. 22. Upper longitudinal rod to rear axle beam mounting bracket. 23. Cross and longitudinal rod spacer sleeve. 24. Upper longitudinal and transverse rod rubber sleeve. 25. Rear shock absorber. 26. Cross rod to body mounting bracket. 27. Brake pressure regulator. 28. Pressure regulator protective boot. 29. Pressure regulator drive lever axle. 30. Pressure regulator mounting bolts. 31. Pressure regulator drive lever. 32. Lever support sleeve housing. 33. Support sleeve. 34. Crossbar. 35. Crossbar mounting bracket support plate.
The rear wheel suspension is dependent, since both wheels are connected to the body by the rear axle beam, which is attached to the body by four longitudinal and one transverse rod. The longitudinal rods transmit pushing and braking forces from the wheels to the body, and the transverse rod holds the body from lateral displacements. The beam assembled with the rods constitutes the suspension guide device.
Both the longitudinal and transverse rods are pivotally connected to the body brackets at one end, and to the rear axle beam brackets at the other. Each rod is made of a steel pipe, to the flattened ends of which the heads are welded. The rod heads have conical holes, into which rubber-metal hinges are pressed. The hinge joints are identical in design, differing only in size. Each hinge consists of a rubber bushing 24, into the hole of which a metal bushing 23 is installed, through which the rod mounting bolt passes. The front heads of the longitudinal rods are fastened with bolts with self-locking nuts to the body brackets. The rear heads of these rods, as well as the heads of the lower longitudinal rods, are fastened with bolts with nuts and spring washers. Brackets for fastening the parking brake cable are welded to the lower longitudinal rods.
When tightening the rod mounting nuts, a tight fit of the spacer bushings 19 and 23 to the bracket cheeks is ensured, which prevents the spacer bushings from turning on the mounting bolts. Rubber bushings 20 and 24 also cannot turn in the rod heads, since they have a tight fit in them. To prevent premature wear of the rod hinges, they are tightened to a torque of 80 N·m (8 kgf·m) under a load that ensures a distance of 125 mm from the rear axle beam casing to the body side member.
When the body or rear axle beam oscillates, the rods swing due to the elastic deformation of the bushings without them slipping. Rubber bushings ensure silent operation of the suspension and do not require lubrication.
The elastic element of the suspension is the springs 7, installed between the body and the rear axle beam. The lower end of the spring rests against the lower support cup 3 through the plastic insulating gasket 2. The support cup is welded to the rear axle beam. The upper end of the spring rests against the upper support cup 11, welded to the body. Between the support cup and the spring, a rubber gasket 10 is installed, located in a stamped steel collar 9. Insulating gaskets 10 and 2 reduce the transmission of noise and vibrations from the rear axle beam to the body.
Rear suspension springs under a load of 2950 N (295 kgf) are divided into two groups: A - length more than 273 mm, B - length equal to or less than 273 mm. Group A springs are marked with yellow paint on the outer side of the coils, and group B - with green paint.
Both suspensions must be equipped with group A springs. In exceptional cases, it is permissible to install group B springs on the rear suspension, but only group A springs must be installed on the front suspension.
The damping device of the suspension consists of two double-acting hydraulic shock absorbers. Each shock absorber is attached with one head to the body bracket, the other to the rear axle beam bracket. Two rubber bushings 15 are installed in the heads of the shock absorbers. Steel bushings pass through the opening of the rubber bushings in the lower head, which are clamped between two steel washers.
When the suspension oscillates, the shock absorber hinges are elastically deformed and, like other hinge joints of this type, are not lubricated.
The upward travel of the rear axle beam is limited by two main buffers 4 of the compression stroke and an additional 17. The main buffer of the compression stroke is located inside the spring and is secured with a mushroom-shaped nipple in the upper support cup. The additional buffer is secured in the same way on a bracket, which is bolted to the bottom of the body. During the compression stroke, the main buffers rest against the lower support cups 3, the additional one against the platform of the rear axle beam. The compression stroke of the suspension is 75 mm, and the recoil is 135 mm.
The torsion arm 31 of the pressure regulator drive is pivotally attached to the rear axle beam bracket via the pillar 12. The supports for the arm 31 are: on one side, the collar 32 with the support sleeve 33, fixed to the cross member of the body floor, on the other - the axle 29, which is installed in the holes of the lugs of the pressure regulator housing 27. The short arm of the arm 31 passes through the radial hole of the axle 29. To fix this arm of the arm, a plate is used, through the hole of which the arm 31 passes, and the plate itself is fastened with a bolt to the end of the axle 29. With such a connection of the parts, the arm 31 rotates together with the axle and the plate relative to the holes of the axle. The cavity of the pressure regulator is closed with a rubber protective cover 28. The suspension of the rear wheels of VAZ cars is unified for all models, with the exception of front-wheel drive ones. In addition, the rear suspension of the station wagon is equipped with stiffer springs.
Wheels, tires. The car uses stamped disk wheels with a rim size of 127J-330 (5J-13), which are fastened with four bolts: the front ones to the wheel hub, the rear ones to the axle flange. To center the wheel disk relative to the holes for the mounting bolts, two guide pins are screwed into the front wheel hub and the axle shaft, which enter the holes in the disk when the wheel is mounted. The guide pins simultaneously fasten the brake disk and its pressure ring to the front wheel hub, and the brake drum to the axle flange.
On the peripheral part of the disk, on the border with the rim, four elongated windows for ventilation of the brake mechanisms are stamped. A deep-profile rim with an asymmetrical recess for the tire is spot welded to the side of the wheel disk. A hole for the tube valve is made in the rim, and the dimensions in inches (5J -13), the manufacturer (VAZ) and the month and year of manufacture (in numbers) are applied to the bottom of the rim recess. Radial tires, size 175/70R-13 (model IN-25) or 165/80R-13 (model MI-166). The first number indicates the width of the tire in mm (175 or 165), the numbers located after the "fraction" sign are the percentage ratio of the profile height to its width (70 or 80%), R is the radial structure of the tire, when the cord threads in the carcass layers are located radially along the tire profile, from one side to the other, 13 is the tire seat diameter in inches. If the letter S is included in the tire marking, it indicates the maximum speed for this tire (180 km/h).
(Information copied from the portal VAZbook.ru)
The air pressure in tires of size 175/70R-13 should be 1.7 kgf/cm² for the front wheels, 2.0 kgf/cm² for the rear wheels, and 1.6 kgf/cm² and 1.9 kgf/cm² for tires of size 165/80R-13, respectively.
The imbalance of the tires assembled with the wheels should not exceed 2600 g mm. The imbalance is checked on special stands and eliminated by balancing weights, which are held on the rim by special springs.