High pressure fuel pump
AssigneeHitachi, Ltd.
InventorsYoshinobu Ono, Yukio Takahashi, Hideki Machimura, Minoru Hashida, Masayoshi Kotaki, Takefumi Yamamura
Life of this patent
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Abstract
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.
Claims15
A high pressure fuel pump comprising:
- a cup-shaped body;
- a cylinder block engaged with the cup-shaped body so as to close the opening side of the cup-shaped body;
- a rotation shaft supported at the bottom of the cup-shaped body and rotated by a driving source;
- a swash plate disposed in a driving mechanism chamber inside the cup-shaped body, which converts a rotating movement to a shaking movement;
- a plunger reciprocated in a cylinder bore formed in the cylinder block according to the shaking movement of the swash plate;
- a sealing element provided between the inside wall of the cylinder bore and the plunger;
- an oil supply mechanism which supplies oil to the driving mechanism chamber;
- and
- an oil passage for connecting the driving chamber mechanism with an engine cam chamber.
A high pressure fuel pump comprising:
- a cup-shaped body;
- a cylinder block engaged with the cup-shaped body so as to close the opening side of the cup-shaped body;
- a rotation shaft supported at the bottom of the cup-shaped body and rotated by a driving source;
- a swash plate disposed in a driving mechanism chamber inside the cup-shaped body, which converts a rotating movement to a shaking movement;
- a plunger reciprocated in a cylinder bore formed in the cylinder block according to the shaking movement of the swash plate;
- a sealing element provided between the inside wall of the cylinder bore and the plunger;
- an oil supply mechanism which supplies oil to the driving mechanism chamber;
- a low pressure side fuel passage formed in the cylinder block;
- a low pressure fuel introducing passage formed in the plunger, which connects the low pressure side fuel passage with a pump chamber formed in the cylinder bore, the pump chamber varying its capacity according to the plunger reciprocating in the cylinder bore;
- and
- an oil passage for connecting the driving chamber mechanism with an engine cam chamber.
A high pressure fuel pump comprising:
- a shaft for transmitting a driving force from the outside;
- a cam converting a rotating movement of the shaft to a reciprocating movement;
- a plunger reciprocated by the cam;
- a cylinder bore formed in a cylinder block;
- a pump chamber formed by putting the plunger into the cylinder bore;
- a sealing element sealing a space between the cylinder bore and the plunger;
- an oil supply mechanism which supplies oil to the cam;
- and
- an oil passage for connecting the driving mechanism chamber with an engine cam chamber.
Dependencies are inferred from the claim text.