781Description of multiplate clutch mechanism

To overcome this deficiency a multiplate wet clutch is incorporated to one side of the differential cage, see Fig. 7.41. One set of the clutch plates have internal spin teeth which mesh with splines formed externally on an extended sun (side) gear, whereas the other set of inter disc plates have external spline teeth which mesh with internal splines formed inside the differential cage. Thus, when there are signs of any of the wheels losing their grip the clutch plates are automatically clamped partially or fully together. The consequence of this is to partially or fully lock both left and right hand side output drive shafts together so that the loss of drive of one drive wheel will not affect the effectiveness of the other wheel. To activate the engagement and release of the multiplate clutch, a servo-piston mounted on the right hand side bearing support flange is used: the piston is stepped and has internal seals for each step so that hydraulic fluid is trapped between the internal and external stepped piston and bearing support flange respectively.

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