| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable displacement type hydraulic device which is prevented from becoming faulty when a swash plate is inclined, and furthermore the efficiency degradation and the noise increase of which can be suppressed.SOLUTION: The variable displacement type hydraulic device according to the embodiment comprises a housing, a cylinder block, pistons, a swash plate, an oil groove, an operating piston and a servo-mechanism. The cylinder block is rotatably provided in the housing. The pistons are respectively fitted and inserted into a plurality of cylinder holes formed in the cylinder block. The swash plate is provided at a side opposite to an end part in the cylinder hole of the piston, is provided slidably with respect to the opposite side end and provided in an inclinable and slidable manner with respect to the housing. The oil groove is formed in the sliding surface of the swash plate and assures a sliding property between the housing and the swash plate. The operating piston inclines the swash plate. The servo mechanism supplies hydraulic oil in order to drive the operating piston. Then, the secondary pressure generated by the servo mechanism is supplied to the servo groove.SELECTED DRAWING: Figure 1 |
