Patent ID: 7454905
Filing Date: 2008-11-25
Classification: F16H

Abstract:
1. A clutch mechanism for a hydrostatic continuously variable transmission, the clutch mechanism being provided between a hydraulic pump and a hydraulic motor of a hydraulic circuit, the hydraulic circuit including a high pressure oil path for feeding working oil from the hydraulic pump to the hydraulic motor and a low pressure oil path for feeding working oil from the hydraulic motor to the hydraulic pump, the high pressure oil path and the low pressure oil path being shortened by sliding a clutch valve arranged at a transmission shaft of the continuously variable transmission through a centrifugal governor to change over power transmission, said clutch mechanism comprising: a cam plate member, said cam plate member being arranged at an end part of the transmission shaft; a roller engaged with said cam plate member and movable outwardly in a diametrical direction by a centrifugal force; a roller bearing member that receives a roller pressing force through outward motion of said roller, said roller bearing member being axially slidable and including a pressure plate and a shaft engaged with the clutch valve, the pressure plate and the shaft being separate pieces and being connected by a welding material or a brazing material; and a spring member that biases said roller bearing member toward said roller.