Vane pump containing a back pressure introduction passage

Patent metadata

Field	Value
Publication number	US-10041491-B2
Application number	US-82038610-A
Country	US
Kind code	B2
Filing date	Jun 22, 2010
Priority date	Jun 30, 2009
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

In a vane pump, a communication groove that provides communication between a communication hole and a discharge port is formed in an outer side face of a rear housing. An opening of the communication groove is blocked by a fitting face of a control valve case. A back-pressure introduction passage that provides communication between the communication hole and an outlet is formed by the communication groove and the fitting face of the control valve case. The back-pressure introduction passage is formed between the rear housing and the control valve case, that is, on the outer side of the housing.

First claim

What is claimed is:

1. A vane pump, comprising:
a shaft including an end;
a pump housing having a front housing and a rear housing, the front and rear housings each having an inner face and an outer face, the rear housing comprising a communication hole that provides communication between a portion of the inner face of the rear housing and the outer face of the rear housing, the shaft being received into the front housing and the rear housing such that the end of the shaft is disposed in the rear housing;
a cam ring that is provided between the inner face of the front housing and the inner face of the rear housing;
a rotor that is rotatably provided on a radially inner side of the cam ring, and that has a radially outer peripheral face in which multiple vane housing portions that extend in a radial direction are formed, each vane housing portion comprising a vane back-pressure chamber formed at a radially inner end portion of the vane housing portion;
a vane slidably provided in each of the vane housing portions;
a hydraulic pressure supply destination component with the outer face of the rear housing fitted to a fitting face of the hydraulic pressure supply destination component; and
a back-pressure introduction passage that is between a discharge port and the communication hole and connects the discharge port to the communication hole, the back-pressure introduction passage being formed between an outer facing surface of the rear housing and one of the fitting face or an adjacent face of the hydraulic pressure supply destination component, wherein
the outer face of the rear housing includes a radially inner portion disposed proximate the end of the shaft and a radially outer portion remotely spaced apart from both the end of the shaft and the radially inner portion, the radially inner portion and the radially outer portion of the outer face of the rear housing, respectively, being placed against the fitting face of the hydraulic pressure supply destination component,
upon rotation of the rotor, operation of the vanes causes hydraulic fluid to be discharged to the discharge port, and
a portion of the discharged hydraulic fluid is introduced into each of the vane back-pressure chambers, whereby the vanes are pushed against an inner periphery of the cam ring.

2. The vane pump according to claim 1 , wherein
the back-pressure introduction passage is formed between the outer facing surface of the rear housing and the fitting face of the hydraulic pressure supply destination component,
such that the back-pressure introduction passage is disposed only in the rear housing.

3. The vane pump according to claim 1 , wherein
the back-pressure introduction passage is formed between the outer facing surface of the rear housing and the adjacent face of the hydraulic pressure supply destination component, and
the outer facing surface is the outer face of the rear surface such that the back-pressure introduction passage is disposed only in a hydraulic pressure supply destination component-side recess formed in the hydraulic pressure supply destination component.

4. The vane pump according to claim 1 , wherein
the back-pressure introduction passage is formed between two outer facing surface of the rear housing and the adjacent face of the hydraulic pressure supply destination component,
such that the back-pressure introduction passage is disposed both in the rear housing and in
a hydraulic pressure supply destination component-side recess formed in the hydraulic pressure supply destination component.

Assignees

• Ando Kazuya
• Jtekt Corp

Inventors

• Ando Kazuya

Classifications

• F01C21/0863

  the fluid being the working fluid · CPC title

• F01C21/108

  with an axial surface, e.g. side plates · CPC title

• F04C2/3446 Primary

  the inner and outer member being in contact along more than one line or surface · CPC title