OIL PRESSURE DEVICE, OIL PRESSURE PUMP AND MAINTENANCE METHOD FOR OIL PRESSURE PUMP

摘要

PROBLEM TO BE SOLVED: To suppress pulsation of a low oil pressure line while suppressing an oil pressure pump from having a more complicated structure.SOLUTION: An oil pressure device comprises an oil pressure pump and an oil pressure motor driven with working fluid from the oil pressure pump. The oil pressure pump includes: a plurality of first pistons arrayed at least in a circumferential direction of the oil pressure pump; a first cylinder block provided along the circumferential direction of the oil pressure pump and having a plurality of first cylinders formed to guide the plurality of first pistons respectively to move reciprocally along a radial direction of the oil pressure pump; a ring cam arranged radially outside the first cylinder block and provided opposite the plurality of first pistons; and a low oil pressure line positioned on an inner peripheral side of the first cylinder block to be surrounded with the first cylinder block, and including a low oil pressure storage space storing working oil to be supplied to a plurality of working chambers formed of the plurality of first pistons and the plurality of first cylinders respectively.SELECTED DRAWING: Figure 2