VANE PUMP

• US 20100329917A1
• Filed: 06/22/2010
• Published: 12/30/2010
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Original Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Inventors: ANDO, Kazuya
• Granted Patent: US 10,041,491 B2
• Time in Patent Office: Days
• US Class Current: 418/133
• CPC Class Codes: F01C 21/0863 the fluid being the working fluid
• CPC Class Codes: F01C 21/108 with an axial surface, e.g. side plates
• CPC Class Codes: F04C 2/3446 the inner and outer member being in contact along more than one line or surface

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.

Claims

1. A vane pump, comprising:

a housing;

a cam ring that is provided in the housing;

a rotor that is rotatably provided on an inner side of the cam ring, and that has an outer peripheral face in which multiple vane housing portions that extend in a radial direction are formed; and

multiple vanes that are slidably provided in the vane housing portions,

wherein, in the vane pump, a portion of hydraulic fluid discharged by an operation of the vanes caused by rotation of the rotor is introduced into vane back-pressure chambers formed at inner end portions of the vane housing portions, whereby the vanes are pushed against an inner periphery of the cam ring,

wherein the housing has a discharge port to which the hydraulic fluid is discharged by the operation of the vanes caused by the rotation of the rotor, and a communication hole that provides communication between a portion of an inner face of the housing, which forms the vane back-pressure chambers together with the inner end portions, and an outer face of the housing, and

wherein a back-pressure introduction passage that provides communication between the discharge port and the communication hole is formed with use of the outer face of the housing.

2. The vane pump according to claim 1, wherein:

the housing is fitted at the outer face to a fitting face of a hydraulic pressure supply destination component; and

the back-pressure introduction passage is formed between the outer face of the housing and the fitting face of the hydraulic pressure supply destination component that contacts the outer face of the housing.

3. The vane pump according to claim 2, wherein the back-pressure introduction passage is formed with use of a housing-side recess that is formed in the outer face of the housing.

4. The vane pump according to claim 2, wherein the back-pressure introduction passage is formed with use of a hydraulic pressure supply destination component-side recess that is formed in the fitting face of the hydraulic pressure supply destination component.

5. The vane pump according to claim 3, wherein the back-pressure introduction passage is formed with use of a hydraulic pressure supply destination component-side recess that is formed in the fitting face of the hydraulic pressure supply destination component.