Vane pump

Patent metadata

Field	Value
Publication number	US-2016245286-A1
Application number	US-201514933111-A
Country	US
Kind code	A1
Filing date	Nov 5, 2015
Priority date	Feb 24, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

A first main back pressure supply port 55 and a first subsidiary back pressure supply port 56 are formed in a first sliding contact surface 5 a of a first side member 5, the first main back pressure supply port 55 is formed in a groove shape in the first sliding contact surface 5 a, and the first subsidiary back pressure supply port 56 communicates with the first subsidiary discharge port 54. A second main back pressure supply port 65 and a second subsidiary back pressure supply port 66 are formed in a second side member 6, the second main back pressure supply port 65 passes through the second side member in the axial direction and the second subsidiary back pressure supply port 66 is formed in a groove shape in a second sliding contact surface 6 a.

First claim

1 . A vane pump comprising:
a pump unit including: a rotor in which a plurality of vanes are slidably mounted in a radial direction; a cam ring inside which the rotor is installed; a first side member having first main and subsidiary intake ports and first main and subsidiary discharge ports along a circumferential direction on both sides in the axial direction of the cam ring; and a second side member having second main and subsidiary intake ports and second main and subsidiary discharge ports along the circumferential direction, wherein a first main back pressure supply port and a first subsidiary back pressure supply port are formed in a first sliding contact surface of the first side member, the first main back pressure supply port is formed in a groove shape in the first sliding contact surface, the first subsidiary back pressure supply port is configured so as to communicate with the first subsidiary discharge port, a second main back pressure supply port and a second subsidiary back pressure supply port are formed in the second side member, the second main back pressure supply port passes through the second side member in the axial direction, and the second subsidiary back pressure supply port is formed in a groove shape in a second sliding contact surface without passing through the second side member in the axial direction.

2 . The vane pump according to claim 1 , wherein the first subsidiary back pressure supply port has a groove shape, a small through hole is formed along the axial direction in a portion of the groove shape, and the small through hole communicates with the first subsidiary discharge port via an expulsion groove which is formed in a surface on the opposite side to the first sliding contact surface.

3 . The vane pump according to claim 1 , wherein the first subsidiary back pressure supply port passes through the first side member in the axial direction thereof, as well as communicating with the first subsidiary discharge port via an expulsion groove which is formed in a surface on the opposite side to the first sliding contact surface.

4 . The vane pump according to claim 1 , wherein the first subsidiary back pressure supply port has a groove shape, and an expulsion hole flow channel which communicates between a portion of the groove shape and an intermediate location of the first subsidiary discharge port in the axial direction is formed.

5 . The vane pump according to claim 1 , wherein, when sending oil to equipment from the first subsidiary discharge port, oil pressure supplied to the first subsidiary back pressure supply port from the first subsidiary discharge port is high, and the oil pressure is low during circulation.

6 . The vane pump according to claim 1 , wherein a back pressure chamber of the rotor is configured so as to communicate with either the first subsidiary back pressure supply port or the first main back pressure supply port.

7 . The vane pump according to claim 1 , wherein the first subsidiary back pressure supply port is formed through a range from the vicinity of a virtual line linking a start end of the first subsidiary intake port with a center of diameter of the first side member to the vicinity of a virtual line linking a finish end of the first subsidiary discharge port with the center of diameter of the first side member along a direction of rotation of the rotor.

Assignees

• Yamada Mfg Co Ltd

Inventors

• Senbongi Yuji
• Satou Takahiro

Classifications

• F04C2/3446

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

• F01C21/0863

  the fluid being the working fluid · CPC title

• F04C13/002

  for homogeneous viscous liquids · CPC title

• F04C15/06 Primary

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C2/32

  having both the movement defined in groups F04C2/02 and relative reciprocation between co-operating members · CPC title