Invention Grant
- Patent Title: Electromagnetic drive mechanism and a high-pressure fuel supply pump
- Patent Title (中): 电磁驱动机构和高压燃油供应泵
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Application No.: US11354851Application Date: 2006-02-16
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Publication No.: US07398768B2Publication Date: 2008-07-15
- Inventor: Satoshi Usui , Kenichiro Tokuo , Hiroyuki Yamada , Masami Abe , Hiroshi Odakura
- Applicant: Satoshi Usui , Kenichiro Tokuo , Hiroyuki Yamada , Masami Abe , Hiroshi Odakura
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Crowell & Moring LLP
- Priority: JP2005-069668 20050311
- Main IPC: F02M37/04
- IPC: F02M37/04

Abstract:
The objective of the present invention is to dampen operating sounds of an electromagnetic drive mechanism used for a variable displacement control mechanism in a high-pressure fuel supply pump to reduce an individual difference depending on apparatus due to the change over time or installation tolerance.To achieve the above objective, the present invention is configured such that before the electromagnetic drive mechanism supplies a drive force to a plunger which is electromagnetically driven by the electromagnetic drive mechanism, another displacement force situates the plunger in a specific position. When compared to an occasion where the plunger is displaced all strokes by a magnetic biasing force, the above configuration is able to reduce the force of impact on a member (for example, valve body) mounted to the plunger and a restricting member, thereby damping the collision noise. Furthermore, since an extra member, such as a damping member, is not required, individual difference depending on apparatus do not easily occur.
Public/Granted literature
- US20060201485A1 Electromagnetic drive mechanism and a high-pressure fuel supply pump Public/Granted day:2006-09-14
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