Subaru Impreza 2002 Service Manual page 63

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FRONT DIFFERENTIAL (SURETRAC TYPE LIMITED SLIP DIFFERENTIAL)

Manual Transmission and Differential

9. Front Differential (SURETRAC Type Limited Slip Differential)

The limited slip differential (LSD) automatically limits the differential action and distributes torque

to the left and right wheels adequately to enhance driving stability when the left and right wheels

are rotating at speeds different from each other during driving on a slippery road (muddy, snow-

covered or slushy road) or cornering.

B: STRUCTURE

In the SURETRAC differential, there is a set of hexagonally-shaped cam followers placed between

and kept in contact with the left and right face cams (which correspond to the side gears in a con-

ventional differential).

The cam followers engage at their outer ends with the slots that are cut on the inner surface of the

cage in the axial direction, so they can slide laterally in the slots but must rotate together with the

cage. Since the cam followers push the face cams as the cage rotates, the input torque to the cage

is transmitted to the axle shafts.

There are a needle bearing and thrust washer pair between the face cam on each side and cage.

Moreover, there is a Belleville spring between one of the needle bearing and thrust washer pairs

to give preloading, thus ensuring proper initial friction between the cam followers and face cams.

(2) Thrust washer

(3) Thrust bearing

(4) Face cam

(6) Cam follower

(7) Face cam

(8) Thrust bearing

(9) Thrust washer

(10) Belleville spring

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