Crowell & Moring LLP
Electromagnetic drive mechanism and a high-pressure fuel supply pump
The objective of the present invention is to dampen operating sounds of an electromagnetic drive mechanism used for a variable displacement to reduce an individual difference depending on apparatus due to the control mechanism in a high-pressure fuel supply pump 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.
Hitachi, Ltd.
F F F F F F F F F F F
F02D F02M F02M F02M F02M F02M F02M F02D F02D F02M F02M
inventional inventional inventional additional inventional inventional inventional additional additional additional additional
Satoshi Masami Hiroyuki Hiroshi Kenichiro
Usui Abe Yamada Odakura Tokuo