HYDRAULIC PUMP/MOTOR

摘要

An axial-type hydraulic pump/motor in which a cylinder block with a plurality of cylinder bores formed around a rotation axis slides with respect to a valve plate that has a valve plate discharge port and a valve plate suction port, and controls the amount of reciprocation of a piston in each cylinder bore depending on the inclination of a swash plate. Based on the rotational direction of the cylinder block, an opening shape of an end portion on the front side in the rotational direction of a cylinder port and an opening shape of an end portion on the rear side in the rotational direction of the valve plate suction port PB1 have the same shape or partially have the same shape.

主权项

1. An axial-type hydraulic pump/motor in which a cylinder block with a plurality of cylinder bores formed around a rotation axis slides with respect to a valve plate that has a high-pressure port and a low-pressure port, and controls the amount of reciprocation of a piston in each of the cylinder bores depending on the inclination of a swash plate,
wherein opening shapes of the high-pressure port and the low-pressure port extend circumferentially on the same arc centered around the rotation axis, and are annular band shapes that do not include a top dead point and a bottom dead point, an opening shape of a cylinder port in each of the cylinder bores extends circumferentially on the same arc where the high-pressure port and the low-pressure port are disposed, and is an annular band shape that does not communicate with the high-pressure port and the low-pressure port at least when positioned at the top dead point and the bottom dead point, and based on the rotational direction of the cylinder block: an opening shape of an end portion on the front side in the rotational direction of the cylinder port and an opening shape of an end portion on the rear side in the rotational direction of the low-pressure port partially have the same shape; and/or an opening shape of an end portion on the rear side in the rotational direction of the cylinder port and an opening shape of an end portion on the front side in the rotational direction of the low-pressure port partially have the same shape.