Patent ID: 6405835
Filing Date: 2002-06-18
Classification: B60T,F03C,F16D

Abstract:
A brake device equipped hydraulic motor, comprising a casing formed in a tubular shape, an output shaft rotatably supported in said casing, a cylinder block provided in said casing and supplied with pressure oil from outside to rotationally drive said output shaft, and a brake device provided between said cylinder block and said casing to apply brakes to said output shaft, said brake device having annular non-rotating brake disks provided on an inner peripheral side of said casing, annular rotating brake disks provided axially movably on an outer peripheral side of said cylinder block in alternately overlapped relations with said non-rotating brake disks and arranged to be brought into frictional engagement with said non-rotating brake disks by a brake piston, characterized by the provision of:a plural number of axially extending arcuate grooves provided on circumferential surfaces of said cylinder block at predetermined angular intervals in a circumferential direction thereof; a plural number of arcuate projections provided on an inner peripheral side of and extending radially inward of said rotating brake disks and engaged with said arcuate grooves to restrict rotational movements of said rotating brake disks relative to said cylinder block; and at least three radial contacting land portions each located between said arcuate projections and arranged to be brought into contact with circumferential surfaces of said cylinder block to restrict radial movements of said rotating brake disks relative to said cylinder block; and said radial contacting land portions being formed in an arcuate shape conforming with a contour of said circumferential surfaces of said cylinder block, and arranged to face said circumferential surfaces of said cylinder block through a small gap space narrower than a gap space between said arcuate grooves and arcuate projections.