Xtracer 1152 - Differential

Issue 2.0 – 10/12/15 - 1152 Longitudinal Transaxle Sportscar Gearbox Manual
© 2015 - Xtrac Limited, Gables Way, Kennet Park, Thatcham, Berkshire. RG19 4ZA.
Xtrac Inc, 6183 W. 80th Street, Indianapolis, IN 46278. United States
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4.4. Differential
4.4.1. Description
The gearbox is fitted with a Salisbury-type plate differential as standard, shown in
Figure 2 – Section View of Pate Differential Assembly. The side gears are axially
supported by thrust washers and do not react against any locking part of the
differential. The differential is locked by axial ramp forces through two symmetrical
friction plate packs, giving the differential very linear and predictable locking
characteristics. The side gear rings (ramps) act against a matching cross pin when
drive/coast torque is applied to the differential. The side gear pinion mates are free to
rotate about the cross pin legs independently of the ramp forces. The standard
factory setting for the differential is:-
• 60 degree drive ramp angle / 30 degree coast ramp angle
• 4 friction faces per side (8 in total)
• 48-90Nm static positive preload (new)
An example locking torque vs. input torque plot and table of differential locking
variables can be found in Appendix F – Differential Characteristics.
Figure 2 – Section View of Pate Differential Assembly