In the rear gearbox of the car there is a main gear with a differential and an electromagnetic clutch

The main gear is hypoid.

The main gear drive gear is made integral with the shaft, the spline end of which is connected to the control clutch hub of the electromagnetic clutch

Особенности конструкции заднего редуктора Renault Duster

The pinion shaft is mounted on two tapered roller bearings.

The outer rings of the bearings are pressed into the seats of the gearbox housing, and the inner ones are put on the shaft.

A spacer sleeve is installed between the inner rings; when tightening the bearing nut, the sleeve deforms, providing a constant bearing preload.

The preload of the bearings is controlled by the torque of the drive gear.

The final drive pinion is bolted to the differential case flange.

The differential transmits torque to the rear wheel drives and allows the drives to rotate at different angular speeds.

This allows the wheels, when turning, to travel different lengths of the path without slipping.

The differential case rotates in two tapered roller bearings.

The differential box contains two side gears and two satellites, which are in constant mesh.

The satellites rotate around an axle fixed in the differential box.

Особенности конструкции заднего редуктора Renault Duster

The housing of the electromagnetic clutch for connecting the all-wheel drive is bolted to the main gear housing.

The frictional electromagnetic clutch plays the role of an interaxle differential - it redistributes the torque between the axles depending on road conditions.

The purpose of the clutch is to redistribute the torque from the engine to the rear wheels in accordance with the selected drive mode.

The clutch allows you to connect and disconnect the shaft of the driving gear of the main gear of the gearbox with the cardan drive.

Blocking occurs due to a solenoid (electromagnet).

In 2WD mode, the supply voltage is not supplied to the solenoid, the clutch is unlocked, and no torque is transmitted to the rear wheels.

The transmission works like a front-wheel drive vehicle. In 4WD AUTO mode, the clutch is locked automatically, depending on the difference in wheel rotation.

When driving under normal conditions (when the front and rear wheels rotate at the same speed) the clutch is unlocked - all the torque goes to the front wheels.

If the front wheels (or a wheel) start to rotate faster (slip), the solenoid will be supplied with voltage for 0.1 seconds at the command of the electronic control unit.

It locks the clutch and distributes torque 50/50 between the front and rear wheels.

As soon as the grip of all wheels on the road is equal again, all power will be transferred to the front wheels again.

In 4WD LOCK mode, the clutch is permanently locked and the four-wheel drive is constantly engaged.

The electromagnetic clutch connects the rear-wheel drive on command from the four-wheel drive control unit.

The leading part of the clutch is connected to the rear propeller shaft, and the driven part is connected to the shaft of the driving gear of the main drive.

The driven part has a cam mechanism that changes the tracking force.

The current applied to the clutch solenoid causes the rear axle to be connected.

The amount of transmitted torque is controlled by the adhesion force of the friction discs in the clutch.

At maximum amperage, the clutch is rigidly locked.

Особенности конструкции заднего редуктора Renault Duster

The gearbox is mounted on three bearings to the rear axle subframe.

Особенности конструкции заднего редуктора Renault DusterОсобенности конструкции заднего редуктора Renault Duster

The bracket with the front supports is attached to the rear gear case with two bolts and nuts.

The gearbox cover stud is inserted into the hole in the rear support and secured with a nut.

Особенности конструкции заднего редуктора Renault DusterОсобенности конструкции заднего редуктора Renault Duster

Two breathers are used to equalize the pressures outside and inside the rear gearbox and the electromagnetic clutch.

To clean the breather, remove the breather tip from the holder and turn it on the hose.

Possible gearbox malfunctions and remedies

- Cause of malfunction

Remedy

Four-wheel drive does not connect:

- The electrical contact in the block of wires of the electromagnetic clutch is broken or the electrical circuit of the four-wheel drive control system is damaged

Restore the electrical contact in the block, repair the circuit malfunction

- Faulty four-wheel drive control unit

Replace electronic unit

- Faulty electromagnetic clutch for connecting all-wheel drive

Repair the clutch or replace

Continuous increased noise during rear axle operation:

- Improper adjustment, damage or wear of gears or gearbox bearings

Repair the rear axle gearbox or replace it

- Worn or incorrectly adjusted differential bearings

Repair the rear axle gearbox or replace it

Noise during vehicle acceleration and engine braking:

- Not enough oil

Restore the oil level and check for leaks in the seals

- Incorrect adjustment of the meshing of the final drive gears

Repair the rear axle gearbox

- Incorrect lateral clearance in the meshing of the final drive gears

Repair the gearbox

- Increased clearance in the pinion bearings due to bearing wear

Repair the gearbox

Knock at the start of vehicle movement:

- Wear of the hole for the pinion axle in the differential box

Repair the rear axle gearbox

Oil leak:

- Worn or damaged oil seals of the inner hinges of the rear wheel drives

Replace oil seals

- Looseness of the bolts securing the side cover to the rear axle gear case, damage to the cover gasket

Tighten the bolts, replace the seal

Checking the electromagnetic clutch

When faults are detected in the transmission, the control unit goes into 2WD (front wheel drive) mode, and the warning lamps in the instrument cluster come on.

In this case, you can continue driving at low speed to the service station.

We check the electromagnetic clutch on a viewing ditch or a lift.

Disconnect the negative terminal of the battery

Проверка электромагнитной муфты Renault DusterПроверка электромагнитной муфты Renault Duster

To check the winding of the electromagnetic clutch, remove the clutch control wire pads from the plastic holder

Pressing the latch, disconnect them

Проверка электромагнитной муфты Renault Duster

We connect the tester probes in ohmmeter mode to the block.

If the tester shows infinity, then there is an open circuit in the winding and the clutch needs to be replaced.