Centrifugal Fluid Pressure Canceling Mechanism

There are two reasons for improving the conventional clutch mechanism:

► To prevent the generation of pressure by the centrifugal force that is applied to the fluid in piston fluid pressure chamber (hereafter referred to as "chamber A") when the clutch is released, a check ball is provided to discharge the fluid. Therefore, before the clutch could be subsequently applied, it took time for the fluid to fill the chamber A.

► During shifting, in addition to the original clutch pressure that is controlled by the valve body, the pressure that acts on the fluid in chamber A also exerts influence, which is dependent upon revolution fluctuations.

To address these two needs for improvement, a canceling fluid pressure chamber (hereafter referred to as

"chamber B") has been provided opposite chamber A.

By utilizing lubrication fluid such as that of the shaft, an equal centrifugal force is applied, thus canceling the centrifugal force that is applied to the piston itself. Accordingly, it is not necessary to discharge the fluid through the use of a check ball, and a highly responsive and smooth shifting characteristic has been achieved.

Piston Co Clutch

C0 Clutch C2 Cl^h C1 Clutch

C3 Clutch

Piston Co Clutch

C0 Clutch C2 Cl^h C1 Clutch

C3 Clutch

275CA54

Centrifugal Fluid Pressure Clutch

Target Fluid Pre:

Applied to Chamber A

Target Fluid Pre:

Centrifugal Fluid Pressure Applied to Chamber B

Applied to Chamber A

Centrifugal Fluid Pressure Applied to Chamber B

Piston Fluid

Pressure

Chamber

Chamber B (Lubrication Fluid)

Fluid Pressure Applied to Piston

Shaft Side

157CH17

Fluid pressure applied to piston

Centrifugal fluid pressure applied to chamber B

Target fluid pressure (original clutch pressure)

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