Title:
VARIABLE DISPLACEMENT OIL PUMP AND METHOD FOR PRODUCING VARIABLE DISPLACEMENT OIL PUMP
Document Type and Number:
WIPO Patent Application WO/2024/042811
Kind Code:
A1
Abstract:
A variable displacement oil pump according to the present invention has a protrusion (46) that is partially formed on a spring contact surface (451) of an arm part (45) of a cam ring (4) so as to overlap with part of the outer circumference of a coil spring (SP). This protrusion (46) restricts tilting of the coil spring (SP) and makes it possible to suppress positional deviation of the coil spring (SP). Furthermore, because the protrusion (46) is provided partially on the spring contact surface (451) of the arm part (45) of the cam ring 4, the coil spring (SP) need only be pushed inward of the protrusion (46) when installing the coil spring (SP), thus making it possible to ensure ease of installation of the coil spring (SP).
Inventors:
MATSUMURA RYO (JP)
NAGANUMA ATSUSHI (JP)
MOTOHASHI RYOICHI (JP)
NAGANUMA ATSUSHI (JP)
MOTOHASHI RYOICHI (JP)
Application Number:
PCT/JP2023/020913
Publication Date:
February 29, 2024
Filing Date:
June 06, 2023
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
F04C14/22; F04C15/00
Foreign References:
| JPH0412180A | 1992-01-16 | |||
| US20110300015A1 | 2011-12-08 | |||
| US20200300092A1 | 2020-09-24 | |||
| JPH05126065A | 1993-05-21 | |||
| JP2016104968A | 2016-06-09 | |||
| JPH04315585A | 1992-11-06 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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