To provide a clutch mechanism for a hydrostatic continuously variable transmission, capable of easily manufactured with a roller supporting member constructed to be machined suitable to a shape, wherein a hydraulic circuit consisting of a high pressure oil passage via which operating oil is fed from a hydraulic pump to a hydraulic motor and a low pressure oil passage via which the operating oil is fed from the hydraulic motor to the hydraulic pump is formed between the hydraulic pump and the hydraulic motor and a clutch valve is provided on a transmission shaft, which is slid by a centrifugal governor for short-circuit between the high pressure oil passage and the low pressure oil passage to change over the transmission of power.
The clutch mechanism comprises a cam plate member provided at the end of the transmission shaft, a roller to be engaged with the cam plate member and moved outward in the radial direction with centrifugal force, the roller supporting member to be slid in the axial direction when receiving the thrust of the roller with the outward movement of the roller, and a spring member for energizing the roller supporting member toward the roller. The roller supporting member is integrated with a pressure receiving plate portion and a shaft portion to be slid in engagement with the clutch valve, after they are molded separately.
YOSHIDA YOSHIHIRO
Nakamura Kun
Mitsuharu Oda