Bent axis type axial piston motor

摘要

In a bent axis type axial piston motor, so as to smoothly rotate a drive shaft without lowering motor efficiency and brake the drive shaft if necessary, when the drive shaft is rotated through a cylinder block by causing piston rods to reciprocate, relative rotation between separate plates and friction plates is allowed by removing a pressing force applied by a braking piston, and when the separate plates and the friction plates are pushed to a brake force receiving plate by the braking piston, relative rotation between the separate plates and the friction plates is restrained and thus the drive shaft is braked. Restriction members are disposed between a casing and the brake force receiving plate so as to restrain the brake force receiving plate from moving relative to the casing along the axis of the drive shaft.

主权项

1. A bent axis type axial piston motor comprising:
a drive shaft supported by a casing through a taper roller bearing disposed between the drive shaft and the casing, the drive shaft being supported in a manner such that an end part of the drive shaft is disposed in the casing and the drive shaft is rotatable on an axis thereof; a cylinder block slidably connected to the end part of the drive shaft through a center shaft and a plurality of piston rods disposed around the center shaft, the cylinder block being disposed in the casing in a manner such that the cylinder block is rotatable around an axis of the center shaft; an accommodation space formed in the casing at a position close to a roller accommodation part of the taper roller bearing and surrounding the end part of the drive shaft; a plurality of first braking elements having an annular flat plate shape and disposed in the accommodation space in a manner such that the first braking elements are movable along the axis of the drive shaft but are restrained from rotating relative to the casing; a plurality of second braking elements having an annular flat plate shape and disposed in the accommodation space in a manner such that the second braking elements are movable along the axis of the drive shaft but are restrained from rotating relative to the drive shaft, the second braking elements and the first braking elements being alternately arranged in the accommodation space; a brake force receiving member having an annular shape and disposed in the accommodation space at a position facing the roller accommodation part of the taper roller bearing; and a braking member movably disposed at a position facing the brake force receiving member with the alternately arranged first and second braking elements disposed between the braking member and the brake force receiving member, so as to cause frictional forces between the first and second braking elements by pushing the first and second braking elements against the brake force receiving member, wherein when the drive shaft is rotated using the cylinder block by causing the piston rods to reciprocate, a pressing force applied by the braking member is removed to allow relative rotation between the first and second braking elements, and when the first and second braking elements are pushed against the brake force receiving member by the braking member, relative rotation between the first and second braking elements is restrained so as to brake the drive shaft, wherein a restriction member is disposed between the casing and the brake force receiving member to restrain the brake force receiving member from being moved relative to the casing along the axis of the drive shaft by a flow of oil from the taper roller bearing, wherein the restriction member has a plate shape and is attached to an end surface of the brake force receiving member in a state where an outer circumferential part of the restriction member protrudes from an outer circumferential part of the brake force receiving member, and an internal engagement groove is formed in the casing to receive an end part of the restriction member protruding from the outer circumferential part of the brake force receiving member.