Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
2008-07-15
2008-07-15
Miller, Carl S. (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
C123S446000
Reexamination Certificate
active
07398768
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.
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European Search Report dated Aug. 1, 2006.
Abe Masami
Odakura Hiroshi
Tokuo Kenichiro
Usui Satoshi
Yamada Hiroyuki
Crowell & Moring LLP
Hitachi , Ltd.
Miller Carl S.
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