Hitachi, Ltd.

Yoshinobu Ono

Yukio Takahashi

Hideki Machimura

Masayoshi Kotaki

Minoru Hashida

Takefumi Yamamura

Hiroyuki Yamada

Atsuji Saito

Noboru Baba

Kazuo Ojima

Katsuyoshi Terakado

Shizuka Yamaguchi

Arata Kagiyama

In a fuel pump pressurizing fuel and supplying the fuel to a fuel injection valve of a vehicle engine, a hardened layer of at least one selected from a nitride layer, a carburated and quenched layer and a carbonitrided layer, and a metal compound layer, on a surface of the hardened layer, higher in corrosion resistance than the hardened layer are formed on one of slide surfaces contacting each other and sliding in fuel.

Fuel pump, in-cylinder direct injection type internal combustion engine using the same and surface treatment method

An axial plunger pump which does not need bellows by restricting fuel to a cylinder bore configuring a pump portion and by lubricating the other portion with oil. The high pressure fuel pump includes a plunger reciprocating according to a shaking movement of a swash plate, a cylinder block forming a pump chamber together with the plunger, and a sealing member provided between the plunger and a cylinder bore for sealing oil leaked from the pump chamber to a chamber surrounding the pump chamber, wherein oil in the oil chamber is supplied from the outside of the high pressure fuel pump.

High pressure fuel pump

The present invention provides an axial plunger pump which does not need bellows by restricting fuel to a cylinder bore configuring a pump portion and by lubricating the other portion with oil. The high pressure fuel pump comprises a plunger reciprocating according to a shaking movement of a swash plate, a cylinder block forming a pump chamber together with the plunger, and a sealing member provided between the plunger and a cylinder bore for sealing oil leaked from the pump chamber to a chamber surrounding the pump chamber, wherein oil in the oil chamber is supplied from the outside of the high pressure fuel pump.

An axial plunger pump includes a shaft having a swash plate effecting swing motion and transmitting driving force from the outside, plungers reciprocate by the swing motion of the swash plate. A cylinder block has cylinders formed so as to open on the side of the swash plate, with the plungers inserted therein. Passages in the block supply refuel to the cylinders. A body combined with the cylinder block encloses the swash plate. Sealing members are arranged between the plungers and the cylinders on the swash plate side of the passages formed in the cylinder block for sealing gaps between the plungers and the cylinders, respectively.

Growing community of inventors

Hitachinaka, Japan

Yoshinobu Ono