The rear suspensions of the car differ in design, depending on the model

In this article, we will consider the rear suspension of a 2WD and 4WD car.

Rear suspension of the car 4x2

Особенности задней подвески автомобиля Рено дастер

Rear suspension - semi-independent elastic beam, spring with double-acting telescopic shock absorbers.

U-beam with longitudinal arms welded to it.

The beam is rigid for bending, works for twisting, acting as a torsion bar.

This allows the wheels of the rear axle to move in a vertical plane independently of each other within certain limits.

Особенности задней подвески автомобиля Рено дастер

Such a suspension design brings it closer in comfort to an independent suspension, but it is cheaper and easier to manufacture.

Brackets for supporting the springs are welded to the beam and levers.

To increase lateral stability and reduce roll angles, an anti-roll bar is installed inside the beam, the ends of which are welded to the arm amplifiers.

The stabilizer is a pipe - at the edges of a circular cross-section, and in the middle of an oval one.

Flanges are welded to the suspension arms for attaching the rear wheel axles and brake shields.

Особенности задней подвески автомобиля Рено дастер

At the front, the levers are equipped with welded bushings, with bushings pressed into them, which are designed to pivot the suspension arms to the body.

The outer clip of the silent block is plastic, and the inner one is metal.

The rubber mass of the silent block, vulcanized to the clips, is asymmetrical in cross-section.

Therefore, when pressing the silent block into the lever, it must be strictly oriented.

The elastic elements of the suspension are helical springs.

Особенности задней подвески автомобиля Рено дастер

The spring is supported through rubber gaskets: from below - on the arm bracket and from above - on a support welded to the body side member.

The spacers prevent the transmission of high-frequency vibration from the suspension to the body.

By avoiding contact "steel on steel", the gaskets also exclude knocks and squeaks.

The lower coil of the spring has a smaller diameter.

Rear suspension springs are divided into classes according to their stiffness.

The spring class is marked with paint. The springs of the same class must be installed on the right and left sides of the vehicle.

When replacing, it is recommended to install the springs of the same class as those installed on the vehicle.

Особенности задней подвески автомобиля Рено дастер

A rubber-metal hinge is pressed into the lower eye of the shock absorber, through the central sleeve of which a bolt passes, connecting the shock absorber to the suspension arm.

The shock absorber rod is attached to the body through two rubber pads (one at the bottom of the support, the other at the top) and two metal washers.

A spacer sleeve is installed between the cushions on the shock absorber rod, which does not allow the cushions to deform strongly when tightening the rod nut.

A compression stroke buffer is installed on the shock absorber rod, to which a cover is attached.

The buffer serves to limit the upward travel of the wheel.

Prevents deformation and breakage of suspension elements, and also eliminates the transfer of shock loads to the body.

Особенности задней подвески автомобиля Рено дастер

Rear wheel bearings are double row. The role of the rear wheel hub is played by the brake drum, in the hole of which the outer bearing ring is fitted with an interference fit.

Особенности задней подвески автомобиля Рено дастер

The inner bearing races are mounted on the journal (axle) of the rear wheel - with a small clearance.

In the drum, the bearing is fixed with a retaining ring

During operation, the bearing does not require relubrication.

Особенности задней подвески автомобиля Рено дастер

The angles of the rear wheels are set structurally by the beam geometry and cannot be adjusted in operation.

The angles can only be checked on a special stand and compared with the reference values.

In the event that the values of the angles of installation of the rear wheels do not correspond to the control values, it is necessary to check the condition of the elements of the rear suspension.

Possible malfunctions of the rear suspension of the car 4x2

Noise and knock in the suspension when the vehicle is moving:

Defective shock absorber - Replace shock absorber

Loose shock absorber mounting or wear on shock absorber eyelet bushing - Tighten the lower shock absorber mounting bolt and nut or replace the bushings

Worn trailing arm bushings - Replace bushings

Spring settling or broken - Replace the spring

Wheel bearing failure - Replace bearing

Driving the car away from straight-line movement:

Unequal tire pressure - Set the tire pressure to normal

Wheel tires have different wear or tread pattern - Change tires

Violated camber - Eliminate the cause of the camber

Settling or breakage of one of the springs - Replace the spring

Deformation of trailing arms - Replace silent blocks

Increased or excessive wear on the tire tread:

Tire pressure abnormal - Set normal pressure

The wheel alignment parameters are violated - Eliminate the reasons for the violation of the wheel alignment parameters

Overloading the vehicle - Do not overload the vehicle

Wheel balance imbalance - Balance the wheels

Rear suspension of the car 4x4

Rear suspension - independent, multi-link with coil springs and telescopic shock-absorber struts, used to damp vibrations, absorb shocks and shocks acting on the car body through its wheels.

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The shock absorber struts include elastic elements - springs that prevent the wheels from lifting off the road, ensuring constant traction.

The shock absorbers of the struts prevent body vibrations, which accordingly affects the safety and comfort of movement.

The shock absorber strut at the bottom is attached to the knuckle with two bolts and nuts, and the upper strut support is attached to the body with a nut.

Right and left shock absorber struts are interchangeable.

Особенности задней подвески автомобиля Рено дастер

The fist is connected through silent blocks by two wishbones to the rear suspension subframe and one trailing arm to a bracket attached to the body.

Особенности задней подвески автомобиля Рено дастер

The braking and traction forces during the movement of the car are perceived by the trailing arms, and the forces in the direction perpendicular to the longitudinal axis of the car are perceived by the wishbones.

The left and right rear suspension cams are non-interchangeable.

A double-row angular contact ball bearing of a closed type is installed in the fist, which is fixed in the fist with a retaining ring.

The wheel hub is installed in the bearing inner rings with an interference fit.

The inner rings of the bearing are pulled together (through the hub) with a nut on the shank of the outer hinge of the wheel drive housing.

In operation, the bearing is not adjustable and does not require relubrication.

The nuts for fastening the wheel hubs are the same, with a right-hand thread.

Особенности задней подвески автомобиля Рено дастер

To increase lateral stability and reduce body roll angles, an anti-roll bar is installed.

The ends of the stabilizer bar are connected to the shock absorber struts through struts with ball joints.

The stabilizer legs are interchangeable. The stabilizer bar is attached with two brackets via rubber split pads to the rear suspension subframe.

The bar is made of springy steel.

From the angles of installation of the rear wheels, only their toe is adjusted.

Особенности задней подвески автомобиля Рено дастерОсобенности задней подвески автомобиля Рено дастер

The rear wishbone is connected to the subframe by a bolt with an eccentric belt and an eccentric washer.

Turning this bolt adjusts the toe-in of the wheel.

Особенности задней подвески автомобиля Рено дастер

When the bolt with the washer rotates, its position in the subframe hole changes: when the bolt is displaced to the longitudinal axis of the car, the protrusion of the rear transverse arm decreases and, consequently, the wheel toe angle decreases; when the bolt is displaced from the axis, the angle increases.

The camber angle is given structurally by the suspension geometry and cannot be adjusted in operation.

The angle can only be checked on a special stand and compared with the reference values.

In the event that the values ​​of the angles do not correspond to the control values, it is necessary to check the condition of the rear suspension elements.

Possible malfunctions of the rear suspension of a 4x4 car

Noise and knock in the suspension when the vehicle is moving:

Defective shock absorber - Replace shock absorber

Loose strut mountings or worn strut top mount pads - Tighten the upper strut mountings or replace pads

Worn trailing arm bushings - Replace bushings

Spring settling or broken - Replace the spring

Failure of the bearing of the rear wheel hub - Replace the bearing

Driving the car away from straight-line movement:

Unequal tire pressure - Set the normal tire pressure

Wheel tires have different wear or tread pattern - Change tires

Violated camber - Eliminate the cause of the camber

Settling or breakage of one of the springs - Replace the spring

Deformation of the trailing arms - Replace the rear suspension beam

Trailing arm bushings wear - Replace bushings

Increased or uneven tire tread wear:

Tire pressure abnormal - Set normal pressure

The wheel alignment parameters are violated - Eliminate the reasons for the violation of the wheel alignment parameters

Overloading the vehicle - Do not overload the vehicle

Wheel balance imbalance - Balance the wheels

Pay attention to the exhaust system.

Extraneous knocks emitted by it are often mistaken for a knock in the rear suspension.

The use of non-standard parts or the breakage of the suspension elements of the muffler can cause severe knocking, especially during overgassing.

To check, stop the engine, inspect the exhaust system, check the tightness and suspension of the muffler.

Grasping the end of the exhaust pipe, swing the muffler up and down and from side to side - there should be no knocks.