Title:
VARIABLE DISPLACEMENT PUMP
Document Type and Number:
WIPO Patent Application WO/2024/057753
Kind Code:
A1
Abstract:
A variable displacement pump (VP1) according to the present invention is provided, on a first end surface (FC1) of a cam ring (4), with a first recessed portion (471) which opens into a first discharge passage (ER1), and which has an axial-direction width (D1) that increases with increasing distance outward from a radially inner side of the cam ring (4). As a result, a sudden change in a flow passage cross-sectional area of the first discharge passage (ER1), in particular in the vicinity of an outer peripheral edge portion of the first end surface (FC1) of the cam ring (4), can be suppressed by means of the first recessed portion (471). The generation of vortices in the vicinity of the outer peripheral edge portion of the first end surface (FC1) of the cam ring (4) is thus suppressed, thereby enabling a pressure loss of the pump to be reduced.
Inventors:
KATO DAISUKE (JP)
OZAWA YUTA (JP)
SAGA KOJI (JP)
OZAWA YUTA (JP)
SAGA KOJI (JP)
Application Number:
PCT/JP2023/028252
Publication Date:
March 21, 2024
Filing Date:
August 02, 2023
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
F04C2/344; F04C14/22; F04C15/06
Foreign References:
| JP2016104967A | 2016-06-09 | |||
| JPS59583U | 1984-01-05 | |||
| JP2006170148A | 2006-06-29 | |||
| JP2018035773A | 2018-03-08 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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