Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hideaki Yamauchi

Minoru Hashida

Hideki Machimura

Hiroyuki Yamada

Masayuki Suganami

Masayoshi Kotaki

Toru Onose

Masashi Nemoto

Daisuke Kitajima

Sunao Takahashi

Akihiro Munakata

Takefumi Yamamura

Kazuichi Ishige

A high-pressure fuel pump includes a pump body, a plunger, a retainer, a spring that is configured to energize the plunger in a direction opposite to a direction of the pressurizing chamber, and a tappet covering the retainer from a side of an end portion of the retainer and the plunger. The retainer is provided with a projection portion protruding to a side of the tappet. The projection portion is separated from the tappet by a predetermined distance along an axial direction of the plunger.

High-pressure fuel pump

A fluid pressure pulsation damper mechanism includes: a metal damper having two metal diaphragms joined together with a hermetic seal for forming a sealed spacing filled with a gas between the two metal diaphragms, an edge part overlapping along outer peripheries thereof, a main body having a damper housing in which the metal damper is accommodated, and a cover attached to the main body to cover the damper housing and isolate the damper housing from outside air.

Fluid pressure pulsation damper mechanism and high-pressure fuel pump equipped with fluid pressure pulsation damper mechanism

A seal mechanism with improved pressure tightness is provided to eliminate a return piping to a fuel tank used for reducing pressure applied to the seal mechanism in a high pressure fuel pump. The seal mechanism includes a stress reduction mechanism for reducing the stress generated at the junction between its retaining member and flexible member.

Seal mechanism and fuel pump provided therewith

Growing community of inventors

Hitachinaka, Japan

Hideaki Yamauchi