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
15
4.4.2. Ramp Angles
A number of ramp angle combinations are available for the differential. Note that a
corresponding cross pin is also required. The following combinations are given in
Table 1 - Available Ramp Angles.
Table 1 - Available Ramp Angles
45/30 00P-183-0004 & 00P-183-0005 183-0006
55/45 00P-183-0019 & 00P-183-0020 183-0021
60/30 00P-183-0013 & 00P-183-0014 183-0021
75/45 00P-183-0016 & 00P-183-0017 183-0018
Note: Lower ramp angles give higher locking values. The first value specifies drive
and second value specifies coast. (i.e. 60/30 = 60˚ drive and 30˚ coast). However,
the ramps can be fitted in reverse if preferred, e.g. ramp angle of 55/45 fitted in
reverse would give 45˚ drive and 55˚ coast.
4.4.3. Number of Friction Faces
The number of friction faces in the differential can be adjusted from 2 to 4 faces per
side, in order to produce different locking gradients. The number of friction faces
must be kept equal on each side of the differential cassette to ensure the differential
has symmetrical characteristics for right and left hand corners.
4.4.4. Positive Preload
Two ‘belleville’ disc springs are used in the differential cassette to provide a static
axial ‘preload’ through the plate pack, across the differential. The preload value is not
adjustable and will vary between 48-90Nm on build (new) within the manufacturing
tolerances of the differential components. For guidance on differential build, please
refer to assembly drawing 1152-949-000A.
4.4.5. Differential Test Rig
As part of Xtrac’s research and development department, we have developed the
Quasi-Transient Differential Test Rig (QT-DTR) which enables testing of mechanical
plate and Viscous Combined Plate (VCP) type differentials. The differential can be
subjected to varying levels of input torque and differential speed to study the locking
characteristics of available configurations. The following rig operational modes are
available:
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