发明授权
- 专利标题: Variable displacement pump
- 专利标题(中): 可变排量泵
-
申请号: US12136796申请日: 2008-06-11
-
公开(公告)号: US08186969B2公开(公告)日: 2012-05-29
- 发明人: Shoji Morita , Yasushi Watanabe , Koji Saga
- 申请人: Shoji Morita , Yasushi Watanabe , Koji Saga
- 申请人地址: JP Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Crowell & Moring LLP
- 优先权: JP2007-157000 20070614
- 主分类号: F04B49/00
- IPC分类号: F04B49/00
摘要:
A variable displacement pump includes: a pump section arranged to be driven by an internal combustion engine, and to discharge a lubricant introduced from an induction portion to a plurality of hydraulic chambers, through a discharge portion, by volume variations of the hydraulic chambers; a variable mechanism arranged to move a movable member by using the discharge pressure of the lubricant, and to vary volumes of the hydraulic chambers which are opened to the discharge portion; and an urging section arranged to urge the movable member in a direction to increase quantities of the volume variations of the hydraulic chambers, the urging section having a spring constant which increases as a movement distance of the movable member in a direction to decrease the quantities of the volume variations of the hydraulic chambers increases.
公开/授权文献
- US20080308062A1 Variable Displacement Pump 公开/授权日:2008-12-18