Range Rover Evoque: Drive Clutches, Planetary Gear Train

DRIVE CLUTCHES

Multiplate Drive or Brake Clutch - Typical

Range Rover Evoque. Automatic Transmission/Transaxle - Vehicles With: AWF21 6-Speed Automatic Transmission

  1. Input shaft
  2. Main pressure supply port
  3. Piston
  4. Cylinder - External plate carrier
  5. Clutch plate assembly
  6. Baffle plate
  7. Diaphragm spring
  8. Output shaft
  9. Bearing
  10. Dynamic pressure equalisation chamber
  11. Piston chamber
  12. Lubrication channel

There are three drive clutches and two brake clutches (B2 is a multiplate brake clutch & B1 is a double wrap brake band) used in the AW F21 transmission. Each clutch comprises one or more friction plates dependent on the output controlled. A typical clutch consists of a number of steel outer plates and inner plates with friction material bonded to each face.

Range Rover Evoque. Automatic Transmission/Transaxle - Vehicles With: AWF21 6-Speed Automatic Transmission

The clutch plates are held apart mechanically by a diaphragm spring and hydraulically by dynamic pressure. The pressure is derived from a lubrication channel which supplies fluid to the bearings etc. The fluid is passed via a drilling in the output shaft into the chamber between the baffle plate and the piston. To prevent inadvertent clutch application due to pressure build up produced by centrifugal force, the fluid in the dynamic pressure equalization chamber overcomes any pressure in the piston chamber and holds the piston off the clutch plate assembly.

When clutch application is required, main pressure from the fluid pump is applied to the piston chamber from the supply port. This main pressure overcomes the low pressure fluid present in the dynamic pressure equalization chamber. The piston moves, against the pressure applied by the diaphragm spring, and compresses the clutch plate assembly. When the main pressure falls, the diaphragm spring pushes the piston away from the clutch plate assembly, disengaging the clutch.

One-Way Clutch

  1. Roller
  2. age
  3. Spring
  4. Inner race

The roller clutch used on the one-way clutch uses parallel rollers, located between the smooth, cylindrical inner race and the inclined cam faces of the clutch body. Springs are used to hold the rollers in position between the two contact faces.

When the clutch is rotated in a clockwise direction, the rollers become trapped between the inner race and the inclined cam faces of the clutch body, providing positive (locked) rotation of the inner race, locking the counter-clockwise rotation of the rear planetary carrier. When the clutch is rotated in a clockwise direction, the rollers are moved away from the inclined cam faces and can rotate freely (unlocked) with the clutch body, providing no drive from the clutch to the rear planetary carrier. In this condition the clutch can rotate freely on the inner race.

PLANETARY GEAR TRAIN

  1. Double web planetary gear train - Rear
  2. Single web planetary gear train - Front
  1. Clutch C2
  2. Brake B2
  3. Free wheel clutch F2
  4. Counter drive gear
  5. Brake B1
  6. Clutch C1
  7. Clutch C3
  8. Fluid pump
  9. Input shaft
  10. Differential gear assembly
  11. Counter gear assembly
  12. Pinion gears
  13. Sun gears
  14. Ring gear
  15. Pinion gear
  16. Sun gears
  17. Ring gear

The planetary gear trains used on the AW F21 transmission comprise a single web planetary gear train and a double web planetary gear train. These gear trains are known as Ravignaux type gear trains and together produce the six forward gears and the one reverse gear.

Engine torque is transferred, via operation of single or combinations of clutches to the two planetary gear trains. Both gear trains are controlled by reactionary inputs from brake clutches to produce the six forward gears and one reverse gear. The ratios are as follows:

Range Rover Evoque. Automatic Transmission/Transaxle - Vehicles With: AWF21 6-Speed Automatic Transmission

READ NEXT:

 Power Flows

Operation of the transmission is controlled by the TCM which electrically activates various solenoids to control the transmission gear selection. The sequence of solenoid activation is based on prog

 Transmission Control Module (TCM), Gear Shift Module (GSM)

TRANSMISSION CONTROL MODULE (TCM) TCM Neutral 'N' position Park 'P' position Position sensor/manual shaft Electrical connector The TCM is located on the top of the transmission casing and is c

 Driving Modes

A number of different driving modes are available. Some can be selected by the driver and some are automatically initiated by the TCM to adapt to different driving conditions. Normal Sports Manua

SEE MORE:

 Telephone safety

Switch off your telephone in areas with a high explosion risk. This includes filling stations, fuel storage areas or chemical factories, as well as places where the air contains fuel vapour, chemicals or metal dust. Always stow your mobile phone securely. The functioning of cardiac pacem

 Wheel Knuckle Rear Bushing

Special Tool(s) 204-620-01 Installer, Wheel Knuckle Bushing 204-620-02 Remover/Installer, Wheel Knuckle Bushing 204-620-03 Remover, Wheel Knuckle Bushing LR-121 Hydraulic Cylinder 10t Removal 1. WARNING: Make sure to support the vehicle with axle stands. Raise and support the vehicle. 2. Remove the

© 2011-2021 Copyright www.rrevoque.org