•  When the rotation of the clutch increases, centrifugal force operations on the oil inside the clutch, hydraulic pressure, increases, and the timing of clutch engagement becomes earlier. This causes, a difference in rotation between the input shaft and the output shaft, and shift shock may occur. To solve this, an additional chamber has been provided opposite the piston hydraulic pressure chamber. This causes centrifugal hydraulic pressure to operate in the opposite direction with the same force as the piston, counteracting the pressure of the piston hydraulic pressure chamber.