Vane pump device

Patent metadata

Field	Value
Publication number	US-2022106957-A1
Application number	US-202117551828-A
Country	US
Kind code	A1
Filing date	Dec 15, 2021
Priority date	Jul 31, 2018
Publication date	Apr 7, 2022
Grant date	—

Abstract

A vane pump device includes: a rotor supporting 10 vanes movable in a rotation direction; and a cam ring having an inner circumferential surface facing an outer surface of the rotor. A fluid-suction step where transits to a fluid-discharge step by changing the pump chamber capacity in response to the rotation angle, as a result of the change in the distance from the rotation center to the inner circumferential surface of the cam ring in response to the rotation angle. A starting angle, at which the distance starts increasing after a same distance segment has reached a predetermined rotation angle, has a rotation angle difference of 2.5 degrees or less with respect to a center angle that equally divides a rotation angle at which a downstream-side end portion in the discharge port is formed and a rotation angle at which an upstream-side end portion in the suction port is formed.

First claim

1 . A vane pump device comprising:
a rotor rotating while supporting 10 vanes to be movable in a rotation radius direction; and a cam ring having an inner circumferential surface facing an outer circumferential surface of the rotor, wherein a change in a distance from a rotation center of the rotor to the inner circumferential surface of the cam ring in response to a rotation angle of the rotor causes a change in a capacity of a pump chamber, which is partitioned by the outer circumferential surface of the rotor, the inner circumferential surface of the cam ring, and adjacent two of the 10 vanes, in response to the rotation angle, the change in the capacity of the pump chamber makes transition to at least a suction step in which working fluid is sucked into the pump chamber and a discharge step in which the working fluid is discharged from the pump chamber, a starting angle, which is a rotation angle at which the distance starts to increase after a segment with the same distance has reached a predetermined rotation angle, has a rotation angle difference of 2.5 degrees or less with respect to a center angle when the center angle is assumed to be an angle that equally divides the rotation angle at which a downstream-side end portion in a discharge port is formed and the rotation angle at which an upstream-side end portion in a suction port is formed, and, when it is assumed that a rotation angle of the center angle is 0 degrees, a downstream-side direction in a rotation direction is positive, and an upstream-side direction in the rotation direction is negative, the rotation angle at which the downstream-side end portion in the discharge port is formed is equal to or less than the rotation angle at which the segment with the same distance starts.

Assignees

• Hitachi Astemo Ltd

Inventors

• Taga naoya

Classifications

• F04C2/3442 Primary

  the surfaces of the inner and outer member, forming the working space, being surfaces of revolution · CPC title

• F04C15/06

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

• F04C2/3446

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

• F01C21/108

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

• F04C15/00

  Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00 (of pumps specially adapted for elastic fluids F04C18/00 - F04C29/00) · CPC title