Land Rover Discovery: Rear Drive Axle-
differential - Vehicles without- Active Driveline/
Description and Operation
COMPONENT LOCATION - VEHICLES WITHOUT ACTIVE DRIVELINE
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- Active on-demand coupling
- Rear differential
OVERVIEW
Vehicles without the active driveline system have a conventional mechanical
rear differential. The rear differential has an integrated active on-demand
coupling located on the driveshaft axis.
The rear differential operates in conjunction with the active on-demand
coupling to provide controlled torque to the rear halfshafts. Torque is supplied
to the active on-demand coupling and the rear differential from
the Power Transfer Unit (PTU).
For additional information, refer to: Four-Wheel Drive Systems (308-07B
Four-Wheel Drive Systems - Vehicles Without: Active Driveline, Description
and Operation).
The torque is controlled by the electro-hydraulic active on-demand
coupling.
The full time intelligent system continuously varies the front and rear torque
split to provide variable All Wheel Drive (AWD) torque when required.
The active on-demand coupling is mounted on the rear differential,
between the rear differential and the driveshaft. The active on-demand
coupling is a self-contained unit combining mechanical, hydraulic and
electronic functions to distribute torque between the front and rear
halfshafts with fully automatic control.
DESCRIPTION
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Rear Differential Section View
Active on-demand coupling
Pinion shaft
Taper roller bearings
Pinion gear
Side gear - right halfshaft
Pinion gear
Crosspin shaft
Differential carrier
Angular
Clutch assembly
Pressure relief/air bleed valve
Casing
Driveshaft flange
Electric motor and pump assembly
Active on-demand coupling control module
Pump housing
Electrical connectors
The ac
PRINCIPLES OF OPERATION
For a detailed description of the Rear Differential, refer to the relevant
Description and Operation section in the workshop manual. REFER to: Rear
Drive Axle and Differential
SEE MORE:
The valve block is located in a vertical position at the front of the
transmission main casing, behind a sealed cover. The valve block contains a
number of solenoids and spool valves to control the transmission operation.
The solenoids are controlled by the TCM to provide gear changes and
smooth t
NOTE:
The rocker panel is installed in conjunction with:
Front bumper cover
Front fender
Front fender splash shield
Front door
Rear door
front seat
Rear seat cushion
Cowl side trim panel
B-Pillar lower trim panel
Front scuff plate trim panel
Front safety belt retractor
Rear quarter pane