Fluid pressure rotating machine

Patent metadata

Field	Value
Publication number	US-11767832-B2
Application number	US-202117999488-A
Country	US
Kind code	B2
Filing date	Mar 11, 2021
Priority date	May 26, 2020
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A piston pump includes: a tilting mechanism configured to bias a swash plate in accordance with a control pressure; a support spring configured to support the swash plate; and a regulator configured to control a control pressure guided to the tilting mechanism in accordance with a self-pressure of the piston pump. The regulator has an outer spring and an inner spring configured to be extended and compressed by following tilting of the swash plate; and a control spool configured to be moved in accordance with a biasing force from the outer spring and the inner spring, the control spool being configured to regulate the control pressure, and the outer spring and the inner spring and the support spring are provided adjacent to each other and in parallel with respect to the swash plate.

First claim

The invention claimed is:

1. A fluid pressure rotating machine comprising: a cylinder block configured to be rotated together with a driving shaft; a plurality of cylinders formed in the cylinder block, the cylinders being arranged at predetermined intervals in a circumferential direction of the driving shaft; pistons respectively inserted into the cylinders in a slidable manner, the pistons being configured to each define a capacity chamber in an interior of the cylinder; a tiltable swash plate configured to cause the pistons to reciprocate such that the capacity chambers are expanded and contracted; a tilting mechanism configured to apply a tilting mechanism biasing force against the swash plate in accordance with a supply control pressure; a support biasing member configured to support the swash plate by exerting a biasing force against the tilting mechanism biasing force; and a regulator configured to control the supply control pressure to the tilting mechanism in accordance with a discharge pressure of the fluid pressure rotating machine, wherein the regulator has a biasing member configured to be extended and compressed by following tilting of the swash plate; and a control spool configured to be moved in accordance with a biasing force from the biasing member, the control spool being configured to regulate the supply control pressure, the biasing member and the support biasing member are provided adjacent to each other, and the support biasing member is configured so as not to exert the biasing force against the control spool.

2. The fluid pressure rotating machine according to claim 1 , wherein the support biasing member and the biasing member are each a coil spring, and the biasing member is provided on an inner side of the support biasing member.

3. The fluid pressure rotating machine according to claim 1 , further comprising:
a guide mechanism configured to guide a biasing force imparted to the swash plate from the support biasing member and the biasing member, wherein
the guide mechanism has:
a guide pin configured to transmit the biasing force from the support biasing member and the biasing member to the swash plate; and
a guide hole formed such that a center axis of the guide hole extends in parallel with a center axis of the control spool, the guide hole being formed such that the guide pin is slidably inserted into the guide hole.

4. The fluid pressure rotating machine according to claim 1 , wherein
one end of the support biasing member is moved by the tilting of the swash plate, and other end of the support biasing member is not moved by the tilting of the swash plate.

5. The fluid pressure rotating machine according to claim 4 , further comprising
a housing member configured to accommodate the cylinder block, wherein
the housing member is formed with a support groove in which the other end of the support biasing member is seated, the support groove being configured to support the support biasing member.

6. The fluid pressure rotating machine according to claim 4 , wherein
the regulator has a sleeve attached to an attachment hole, the attachment hole being formed in the housing member, and
the sleeve has:
a seat portion on which the end portion of the support biasing member is seated; and
a protruded portion protruded from the seat portion, the protruded portion being configured to support an inner circumference of the support biasing member.

Assignees

• Kyb Corp

Inventors

• Takei Gen
• Iwanaji Tetsuya
• Kuboi Hiroaki

Classifications

• F04B1/2078 Primary

  Swash plates · CPC title

• F04B1/306

  by turning the swash plate, e.g. with fixed inclination · CPC title

• F04B1/32

  by varying the relative positions of a swash plate and a cylinder block · CPC title

• F04B1/324 Primary

  by changing the inclination of the swash plate · CPC title

• F04B1/2092

  Means for connecting rotating cylinder barrels and rotating inclined swash plates · CPC title