Title:
電動ポンプユニット及び電動オイルポンプ
Document Type and Number:
Japanese Patent JP4888158
Kind Code:
B2
Abstract:
In an electric pump unit, communication between arcuate ports (13ri,13ro) provided in correspondence with a discharge side and a suction side of an internal gear pump (2) is selectively permitted and prohibited in correspondence with movement of a spool of a relief valve (4). If fluid pressure at the discharge side of the internal gear pump becomes greater than or equal to a predetermined value, the spool moves across an inner arc of one of the arcuate ports corresponding to the suction side of the internal gear pump and from a position at which the spool prohibits the communication between the arcuate ports to a position at which the spool permits the communication. As the spool moves away from the position at which the spool blocks the communication between the arcuate ports, the opening degree of the relief valve changes in accordance with a downward convex curve ( Fig 5c ).
Inventors:
Yamamoto Ikusei
Takatoshi Sakata
Takatoshi Sakata
Application Number:
JP2007049857A
Publication Date:
February 29, 2012
Filing Date:
February 28, 2007
Export Citation:
Assignee:
JTEKT Corporation
International Classes:
F04C2/10; F04C14/26; F04C15/06; F16H57/02; F16H57/04
Domestic Patent References:
| JP2006233867A | ||||
| JP2005098507A | ||||
| JP2006188968A |
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda
Makoto Onda