Automotive fuel pump
AssigneeHitachi Automotive Systems Americas Inc.
InventorJason Abdulghani Abbas
Life of this patent
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Abstract
An automotive fuel pump having a body with an inlet, an outlet, and an elongated chamber therebetween. A relief valve, relief valve housing, and check valve are respectively disposed in the chamber between the inlet and the outlet. The relief valve housing has a portion which extends across the chamber so that a first axial end of the relief valve housing forms a valve seat for the check valve while the other axial end forms a valve seat for the relief valve. The check valve permits fluid flow from the body chamber to the outlet while the relief valve exhausts excess fluid pressure at the outlet back into the body chamber.
Claims20
A liquid fuel pump comprising:
- a body having an inlet, an outlet and an elongated chamber between said inlet and said outlet,
- a relief valve, a relief valve housing and a check valve respectively disposed in said chamber between said inlet and said outlet,
- said relief valve housing having a portion extending across said chamber, a first axial side of said relief valve housing portion forming a valve seat for said check valve and a second axial side of said relief valve housing portion forming a valve seat for said relief valve,
- said check valve movable between an open position to enable fluid flow from said chamber into said outlet and a closed position,
- a first spring which urges said check valve towards said closed position,
- said relief valve movable between an open position to enable fluid flow from said outlet into said chamber and a closed position,
- a second spring which urges said relief valve towards said closed position,
- a pump member which supplies pressurized fuel from said inlet to said chamber.
A liquid fuel pump comprising:
- an elongated body having an elongated chamber, an inlet open adjacent one end of said body and an outlet open adjacent the other end of said body,
- a cylinder having an inlet valve seat which extends across said body chamber between said inlet and said outlet, said inlet valve seat having at least one through passageway,
- an inlet valve movable between an open position to permit fluid flow through said through passageway and a closed position to stop fluid flow through said through passageway,
- a solenoid coil disposed around said housing adjacent said inlet valve which, upon energization, moves said inlet valve from one of said open and closed positions to the other of said open and closed positions.
A pressure dampener for a fuel pump comprising:
- an inner annular shell,
- an outer annular shell hermetically sealed to said inner shell and forming a closed chamber between said shells,
- a plurality of helical ribs fainted on at least one of said shells.
Dependencies are inferred from the claim text.