The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 2010
Filed:
Jun. 12, 2008
Satoshi Usui, Hitachinaka, JP;
Kenichiro Tokuo, Hitachinaka, JP;
Hiroyuki Yamada, Hitachinaka, JP;
Masami Abe, Hitachi, JP;
Hiroshi Odakura, Hitachiota, JP;
Satoshi Usui, Hitachinaka, JP;
Kenichiro Tokuo, Hitachinaka, JP;
Hiroyuki Yamada, Hitachinaka, JP;
Masami Abe, Hitachi, JP;
Hiroshi Odakura, Hitachiota, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
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.