Swash plate type liquid-pressure rotating device and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-10533544-B2
Application number	US-201515304610-A
Country	US
Kind code	B2
Filing date	Mar 31, 2015
Priority date	May 1, 2014
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

A swash plate type liquid-pressure rotating device includes a movement restricting mechanism configured to restrict a movement of a spherical bushing relative to a rotating shaft toward a first side in an axial direction. The movement restricting mechanism is a restricting member such that a portion of the spherical bushing which portion is located at the first side in the axial direction contacts the restricting member. The swash plate type liquid-pressure rotating device further includes: a stopper attached to the rotating shaft; and a gap adjusting member. The gap adjusting member is inserted into a gap G3 formed between the stopper and the bearing when the spherical bushing, the retainer plate, the shoe, and the swash plate tightly contact one another in the axial direction. The gap adjusting member restricts a movement of the rotating shaft relative to the casing toward the first side in the axial direction.

First claim

The invention claimed is:

1. A swash plate type liquid-pressure rotating device comprising:
a casing;
a rotating shaft inserted through the casing;
a bearing through which the rotating shaft is rotatably supported by the casing;
a swash plate provided in the casing and including a slide-contact surface inclined relative to an axial direction parallel to a center axis of the rotating shaft, the axial direction includes a first direction and a second direction opposite to the first direction;
a shoe configured to slide on the slide-contact surface of the swash plate;
a retainer plate provided apart from the swash plate in the first direction and configured to sandwich the shoe together with the swash plate in the axial direction to hold the shoe;
a spherical bushing externally fitted to the rotating shaft and configured to sandwich the shoe and the retainer plate together with the swash plate in the axial direction to support the retainer plate such that the retainer plate is swingable;
a movement restricting mechanism configured to restrict a movement of the spherical bushing relative to the rotating shaft toward the first direction;
a first stopper member provided apart from the bearing in the second direction and attached to the rotating shaft; and
a gap adjusting member configured to be inserted into a gap, formed between the first stopper member and the bearing in the axial direction when the spherical bushing, the retainer plate, the shoe, and the swash plate tightly contact one another in the axial direction, to restrict a movement of the rotating shaft relative to the casing in the axial direction, wherein:
the bearing includes
an outer ring having a surface directed in the first direction contacting the casing,
an inner ring externally fitted to the rotating shaft at an inner peripheral side of the outer ring,
a plurality of rolling elements provided between the outer ring and the inner ring and contacting a surface of the outer ring directed in the second direction, and
a loose rib having a surface directed in the second direction contacting the gap adjusting member and a surface directed in the first direction contacting the plurality of rolling elements; and

the inner ring is slidable relative to the plurality of rolling elements in the axial direction.

2. The swash plate type liquid-pressure rotating device according to claim 1 , wherein a size of the gap adjusting member in the axial direction is adjustable.

3. The swash plate type liquid-pressure rotating device according to claim 1 , wherein the movement restricting mechanism includes:
an annular groove formed on an outer peripheral surface of the rotating shaft;
a second stopper member externally fitted to a periphery of the annular groove; and
a receiving seat formed on an inner peripheral surface of the spherical bushing and contactable with the second stopper member in the axial direction.

4. The swash plate type liquid-pressure rotating device according to claim 1 , wherein the movement restricting mechanism includes a restricting member provided at the rotating shaft and projecting from an outer peripheral surface of the rotating shaft, the restricting member having a surface directed in the second direction contacting the spherical bushing.

5. The swash plate type liquid-pressure rotating device according to claim 1 , wherein the movement restricting mechanism includes a coupling member configured to couple the spherical bushing and the rotating shaft.

6. The swash plate type liquid-pressure rotating device according to claim 1 , wherein the movement restricting mechanism includes a step portion formed at the rotating shaft, the step has a surface directed in the second direction contacting the spherical bushing.

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Funasaka Arata
• Nishida Shinji
• Ohnishi Masaki

Classifications

• F03C1/0668

  Swash or actuated plate · CPC title

• F04B1/324

  by changing the inclination of the swash plate · CPC title

• F04B27/1063

  Actuating-element bearing means or driving-axis bearing means · CPC title

• F04B1/2078

  Swash plates · CPC title

• F04B1/126

  Piston shoe retaining means · CPC title