Fluid pressure rotating machine

Patent metadata

Field	Value
Publication number	US-10066484-B2
Application number	US-201414431375-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Mar 29, 2013
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A piston motor includes a bush in the form of a curved plate held in sliding contact with a back surface of a tiltable swash plate, a supply/discharge passage formed on the casing including a swash plate port formed on the swash plate and open on the back surface of the swash plate and a bush port penetrating through the bush and provided from a piston to the swash plate, and an elastic ring interposed between the casing and the bush and surrounding an opening end of the bush port.

First claim

The invention claimed is:

1. A fluid pressure rotating machine in which a piston projecting from a cylinder of a rotary cylinder block reciprocates, following a tiltable swash plate housed in a casing, comprising:
a bush in the form of a curved plate held in sliding contact with a back surface of the tiltable swash plate;
a supply/discharge passage includes a swash plate port formed on the swash plate and open on the back surface of the swash plate, and a bush port penetrating through the bush, the supply/discharge passage being provided from the piston to the swash plate;
an elastic ring interposed between the casing and the bush and surrounding an opening end of the bush port; and
a supporting surface formed on the casing for supporting the bush,
wherein a pressure receiving area of the bush surrounded by the elastic ring and facing the supply/discharge passage is so set that a load obtained by a working fluid pressure of the supply/discharge passage pressing the bush against the back surface of the swash plate is lower than a load obtained by the back surface of the swash plate pressing the bush against the supporting surface.

2. The fluid pressure rotating machine according to claim 1 , wherein:
the supply/discharge passage further includes a casing port formed in the casing and open on the supporting surface; and
the elastic ring surrounds a connected part of the bush port and the casing port.

3. The fluid pressure rotating machine according to claim 2 , further comprising a housing groove formed in the casing to surround the casing port and open on the supporting surface, wherein:
the elastic ring is housed in the housing groove.

4. The fluid pressure rotating machine according to claim 3 , wherein:
a groove inner surface of the housing groove extends in a direction normal to the supporting surface, the supporting surface extending in an arcuate manner.

5. The fluid pressure rotating machine according to claim 1 , wherein:
the bush is fixed to the casing via a locking member engaged with a tip of the bush.

Assignees

• Kayaba Industry Co Ltd
• Kyb Corp

Inventors

• Kato Hiroki
• Hosokawa Takeru

Classifications

• F01B3/0052

  Cylinder barrel · CPC title

• F04B1/2078

  Swash plates · CPC title

• F01B3/0073 Primary

  swash plate bearing means or driving or driven axis bearing means · CPC title

• F04B1/02

  having two cylinders (in V-arrangement F04B1/04) · CPC title

• F04B1/2035

  Cylinder barrels · CPC title