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Patent Searching and Data


Title:
VARIABLE DISPLACEMENT-TYPE OIL PUMP
Document Type and Number:
WIPO Patent Application WO/2017/047303
Kind Code:
A1
Abstract:
A variable displacement-type oil pump comprises: a pump-constituting body configured so that oil sucked in from a suction section due to a change in the volume of a plurality of pump chambers 7 caused by the pump-constituting body being rotationally driven by an engine will be discharged from a discharge section; a cam ring 6 which moves to variably change the amount of change in the volume of each of the pump chambers 7; a coiled spring 8 for pressing the cam ring 6 in the direction in which the amount of change in the volume of the each of the pump chambers 7 increases; a control oil chamber 22 which, by means of oil supplied into the control oil chamber 22, presses the cam ring 6 in the direction in which the amount of change in the volume of the each of the pump chambers 7 decreases; a drain port 38 for discharging oil from the control oil chamber 22; and a control valve 50 into which downstream-side oil discharged from the discharge section is introduced and which, when the pressure of the introduced oil exceeds a preset operating pressure, supplies oil to the control oil chamber 22 to thereby regulate pressure within the control oil chamber 22. As a result of this configuration, an increase in electric power consumption relating to an electrically controlled mechanism can be suppressed.

Inventors:
NAGANUMA, Atsushi (7-1, Onna 4-chome, Atsugi-sh, Kanagawa 10, 〒2438510, JP)
OHNISHI, Hideaki (7-1, Onna 4-chome, Atsugi-sh, Kanagawa 10, 〒2438510, JP)
Application Number:
JP2016/073696
Publication Date:
March 23, 2017
Filing Date:
August 12, 2016
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
F04C14/22; F04C2/344; F04C14/26
Foreign References:
JPS56143383A1981-11-09
US20090202375A12009-08-13
JPS5517696A1980-02-07
Other References:
See also references of EP 3351800A4
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (Ekisaikai Bldg. 1-29, Akashi-cho, Chuo-k, Tokyo 44, 〒1040044, JP)
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