Centrifugal Cancel Mechanism

A/T CONTROL SYSTEM


Centrifugal Cancel Mechanism


FUNCTION
The centrifugal cancel mechanism is a mechanism to cancel the centrifugal hydraulic pressure instead of the conventional check balls. It cancels the centrifugal hydraulic pressure which is generated as high clutch drum rotates, and it allows for preventing high clutch from dragging and for providing stable high clutch piston pressing force in all revolution speeds.

STRUCTURE/OPERATION
A centrifugal cancel housing is provided to cancel the clutch housing pressure. The centrifugal cancel housing is always filled with ATF from the dedicated fluid passage of oil pump.






When Clutch Pressure Is Not Applied
As high clutch drum rotates, a centrifugal force applies to the remaining ATF in clutch housing to push high clutch piston. However, on the other hand, the centrifugal force also applies to ATF filled in centrifugal cancel housing, resulting in a force that pushes high clutch piston back. Consequently the high clutch piston does not move because both forces cancel each other, and thus high clutch is prevented from dragging.

When Clutch Pressure Is Applied
Clutch pressure that applies to clutch housing overcomes the fluid pressure and spring force of the opposing centrifugal housing to push high clutch piston, and high clutch is engaged. At this time, the centrifugal force caused by the revolution speed of high clutch drum has no impact any more since the centrifugal force that applies to the clutch pressure of clutch housing is canceled by the centrifugal force that applies to centrifugal cancel housing. As a result, high clutch piston pressing force is always stable in all revolution speeds, and thus smooth shifting characteristics are achieved.