VARIABLE CAPACITY HYDRAULIC PUMP MOTOR

摘要

In order to reliably lubricate between a sliding protruding part of a support body and a sliding recessed part of a skew plate without incurring problems such as movement of the skew plate with respect to a casing, a ball retainer (50) has a sliding protruding part (52) formed on the tip of a shaft part (51), with an oil penetration passage (53) formed in a region extending from the outer surface of the shaft part (51) to the outer peripheral surface of the sliding protruding part (52), and the ball retainer is fitted into a mounting hole (11b) of a casing (10) by means of the shaft part (51), and fitted in a slidable manner into a sliding recessed part (32) of a skew plate (30) by means of the sliding protruding part (52) while the aperture of the oil penetration passage (53) is covered. A connecting oil passage (56) is formed in the casing (10) from a housing space (21A) housing a main-body-side bearing (21) to the mounting hole (11b), and a lubrication groove (54) is formed between the sliding protruding part (52) of the ball retainer (50) and the sliding recessed part (32) of the skew plate (30) to enable the aperture of the oil penetration passage (53) to remain in communication at all times with a region outside of the area of sliding contact between the sliding protruding part (52) and the sliding recessed part (32).