AUTOMATIC TRANSMISSION HAVING CLUTCH ACTUATOR WITH CANCEL CHAMBER COMPRISING CENTRIFUGAL COMPENSATION

摘要

The automatic transmission is provided with at least one friction element 32 and a piston 33. Engagement of the friction element 32 occurs when operating pressure is applied to an apply chamber 35 to cause the appropriate piston stroke. Disengagement of the friction element 32 occurs when operating pressure is applied to a cancel chamber 35a to cause the appropriate piston stroke. The outer diameter (r) of the pressure-receiving surface in the cancel chamber 35a is substantially the same as that (R) in the apply chamber 35. Therefore, piston pushing force due to centrifugal force in the apply chamber 35 is balanced with piston reverse pushing force due to centrifugal force in the cancel chamber 35a. This prevents the friction element 32 from being dragged while in the disengaged condition.