High-pressure fuel pump device

Patent metadata

Field	Value
Publication number	US-9353716-B2
Application number	US-201214115847-A
Country	US
Kind code	B2
Filing date	May 11, 2012
Priority date	May 13, 2011
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A high-pressure fuel pump device of the invention includes a plunger-type high-pressure pump unit ( 31 ) configured to pressurize fuel as a plunger ( 43 ) thereof makes reciprocating motion, a diaphragm-type supply pump unit ( 33 ) configured to suck in fuel in a fuel tank ( 11 ) and supply the fuel to the high-pressure pump unit as a diaphragm ( 87 ) thereof oscillates in conjunction with the reciprocating motion of the plunger, and a fuel return unit ( 34 ) provided in the supply pump unit and configured to return, to the fuel tank, surplus fuel that is not sucked into the high-pressure pump unit.

First claim

The invention claimed is:

1. A high-pressure fuel pump device comprising:
a plunger-type high-pressure pump unit including a plunger driven by a drive source, the high-pressure pump unit being configured to pressurize fuel and discharge the pressurized fuel as the plunger makes reciprocating motion;
a diaphragm-type supply pump unit including a diaphragm capable of oscillating in conjunction with the reciprocating motion of the plunger, and a suction valve capable of sucking in fuel in a fuel tank, the supply pump unit being configured to supply the fuel to the high-pressure pump unit as the diaphragm oscillates; and
a fuel return unit provided in the supply pump unit and configured such that, out of the fuel supplied to the high-pressure pump unit, surplus fuel that is not sucked into the high-pressure pump unit is returned to the fuel tank by the fuel return unit,
wherein the plunger of the high-pressure pump unit has a passage formed therein, and wherein the supply pump unit is configured to guide the fuel to the high-pressure pump unit through the passage.

2. The high-pressure fuel pump device according to claim 1 , wherein:
the diaphragm of the supply pump unit is coupled to the drive source through an actuator shaft, and
the plunger of the high-pressure pump unit and the actuator shaft of the diaphragm are arranged coaxially with each other.

3. The high-pressure fuel pump device according to claim 1 , wherein the fuel return unit includes a return path configured to pass the fuel to be returned, and a return valve arranged in the return path and configured to flow surplus fuel that is not sucked into the high-pressure pump unit.

4. The high-pressure fuel pump device according to claim 1 , wherein:
the high-pressure pump unit and the suction valve and the fuel return unit of the supply pump unit are arranged on one side of the diaphragm, and
the drive source is arranged on an opposite side of the diaphragm.

5. The high-pressure fuel pump device according to claim 2 , wherein the fuel return unit includes a return path configured to pass the fuel to be returned, and a return valve arranged in the return path and configured to flow surplus fuel that is not sucked into the high-pressure pump unit.

6. The high-pressure fuel pump device according to claim 2 , wherein:
the high-pressure pump unit and the suction valve and the fuel return unit of the supply pump unit are arranged on one side of the diaphragm, and
the drive source is arranged on an opposite side of the diaphragm.

7. The high-pressure fuel pump device according to claim 3 , wherein:
the high-pressure pump unit and the suction valve and the fuel return unit of the supply pump unit are arranged on one side of the diaphragm, and
the drive source is arranged on an opposite side of the diaphragm.

Assignees

• Sato Tomoya
• Muraji Tetsuo
• Hirayama Toshinori
• Kato Hiroshi
• Mikuni Kogyo Kk

Inventors

• Sato Tomoya
• Muraji Tetsuo
• Hirayama Toshinori
• Kato Hiroshi

Classifications

• F04B9/042

  the means being cams · CPC title

• F04B23/06

  the pumps being all of reciprocating positive-displacement type · CPC title

• F02M59/46

  Valves · CPC title

• F04B43/021

  the plate-like flexible member is pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the plane of the plate-like flexible member and each having its own driving mechanism · CPC title

• F04B43/067 Primary

  the fluid being actuated directly by a piston · CPC title