CAM MOTOR DEVICE

摘要

A cam motor device (A) comprises a plurality of cylinders (5, 5, ...) provided in a cylinder block (2) adapted to rotate together with an output shaft (10), and arranged radially in a direction perpendicular to a rotating axis (X), pistons (6) received in the respective cylinders and adapted to be reciprocatingly actuated by a working oil delivered from a distributing valve (7) to rotate the output shaft, and a change-over valve (9) for selectively performing switching connection of the respective cylinders to a working oil supply passage (81) and a discharge passage (82) through the distributing valve. When the change-over valve is at a low speed position, the working oil is supplied to and discharged from all the cylinders, and when the change-over valve is switched to a high speed position, the working oil is supplied to and discharged from a half of the cylinders and a pressure oil is supplied to the remaining half of the cylinders from a charge pump (16).