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.

025CH27Y

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.

Centrifugal Fluid Pressure Applied to Chamber A

Clutch

Target Fluid Pressure

Piston Fluid

Pressure

Chamber

Centrifugal Fluid Pressure Applied to Chamber A

Target Fluid Pressure

Piston Fluid

Pressure

Chamber

Centrifugal Fluid Pressure Applied to Chamber B

Chamber B (Lubrication Fluid)

Fluid Pressure Applied to Piston

Fluid Pressure Applied to Piston

Clutch

Centrifugal Fluid Pressure Applied to Chamber B

Chamber B (Lubrication Fluid)

157CH17

Fluid pressure -

Centrifugal fluid pressure _

Target fluid pressure

applied to piston

applied to chamber B

(original clutch pressure)

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