Bent axis type axial piston motor

Patent metadata

Field	Value
Publication number	US-9249664-B2
Application number	US-201213880809-A
Country	US
Kind code	B2
Filing date	Oct 11, 2012
Priority date	Apr 24, 2012
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

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.

First claim

The invention claimed is:

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.

2. The bent axis type axial piston motor according to claim 1 , further comprising a plurality of restriction members, wherein the restriction members each include a plate shape and are arranged such that the restriction members protrude from a plurality of positions of the outer circumferential part of the brake force receiving member.

3. The bent axis type axial piston motor according to claim 2 , wherein the restriction members have holes long in radial directions of the brake force receiving member and are attached to the end surface of the brake force receiving member by securing fixing screw members to the brake force receiving member through the long holes, and the restriction members are extendable or retractable from the outer circumferential part of the brake force receiving member by varying positions of the fixing screw members in the long holes.

4. The bent axis type axial piston motor according to claim 1 , wherein an external engagement groove is formed in an outer circumferential part of the brake force receiving member, an internal engagement groove is formed in the casing at a position facing the external engagement groove of the brake force receiving member, and the restriction member is disposed between the external engagement groove of the brake force receiving member and the internal engagement groove of the casing.

5. The bent axis type axial piston motor according to claim 4 , wherein the restriction member is an elastic linear member, and if the restriction member is elastically deformed by an external force, the restriction member is accommodated in the external engagement groove of the brake force receiving member, and if the external force is removed, at least a part of the restriction member protrudes outward from the external engagement groove of the brake force receiving member.

6. The bent axis type axial piston motor according to claim 1 , wherein the brake force receiving member is allowed to rotate around the axis of the drive shaft.

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Hori Takashi
• Asano Teppei
• Hosaka Masayuki

Classifications

• F01B3/0038 Primary

  inclined to main shaft axis · CPC title

• F03C1/0642

  inclined on main shaft axis · CPC title

• F01B3/0041

  Arrangements for pressing the cylinder barrel against the valve plate, e.g. fluid pressure · CPC title

• F01B3/0067

  cylinder barrel bearing means · CPC title

• F03C1/26 Primary

  adapted for special use or combined with apparatus driven thereby · CPC title