Fuel pump

Patent metadata

Field	Value
Publication number	US-9683559-B2
Application number	US-201114236596-A
Country	US
Kind code	B2
Filing date	Aug 1, 2011
Priority date	Aug 1, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Provided is a fuel pump comprising: a pump body; a plunger reciprocatably displaceable with respect to the pump body; and a plurality of valve elements inclusive of a suction valve to allow the fuel to be sucked into the fuel pressurizing chamber and a discharge valve to allow the fuel to be discharged out of the fuel pressurizing chamber, in which the pump body comprises a tubular valve retention member to retain the plurality of valve elements, a cylinder member to slidably retain the plunger, and an outer shell member having an inner wall surface facing an outer surface of the valve retention member, the inner wall surface and the outer surface of the valve retention member collectively forming a suction gallery chamber.

First claim

The invention claimed is:

1. A fuel pump comprising:
a pump body having formed in its inner portion with a fuel passage to allow a fuel to be introduced therethrough into the inner portion,
a plunger provided in the pump body to partly form a fuel pressurizing chamber to allow the fuel to be introduced thereinto and discharged therefrom, the plunger being reciprocatably displaceable in an axial direction in which the fuel in the fuel pressurizing chamber is pressurized, and
a plurality of valve elements inclusive of a suction valve to have the fuel to be sucked into the fuel pressurizing chamber and a discharge valve to have the fuel to be discharged from the fuel pressurizing chamber, the pump body including
a valve retention member partly forming the fuel passage, the valve retention member being in a tubular shape to retain the valve elements therein,
a cylinder member supported by the valve retention member and slidably retaining the plunger, and
an outer shell member having an inner wall surface which the valve retention member penetrates through, the inner wall surface of the outer shell member and an entire outer surface of an insertion unit of the valve retention member collectively constituting a fuel storage chamber, in which
the outer shell member including a pair of first insertion holes,
the pair of first insertion holes penetrates through the inner wall surface at opposite ends of the outer shell member in a same axial direction,
an inner diameter of the pair of first insertion holes differ from each other,
the outer surface of the valve retention member has a stepped cylindrical shape, and
a diameter of the valve retention member becomes larger from one end portion towards an other end portion in an axial direction of the valve retention member.

2. The fuel pump as set forth in claim 1 , in which the outer shell member has the pair of first insertion holes and a second insertion hole formed therein, the first insertion holes having a center axis and penetrating through the inner wall surface in the same direction with each other, the second insertion hole having a center axis crossing with the center axes of the first insertion holes, either one of the first insertion holes and the second insertion hole having the valve retention member received therein and the other one of the first insertion holes and the second insertion hole having the cylinder member received therein.

3. The fuel pump as set forth in claim 2 , in which the first insertion hole of the outer shell member has the valve retention member received therein and the second insertion hole of the outer shell member has the cylinder member received therein.

4. The fuel pump as set forth in claim 2 , in which the outer shell member, the valve retention member and the cylinder member collectively constituting the fuel storage chamber to be surrounded by the inner wall surface of the outer shell member and the outer surface of a received portion formed by a part of each of the valve retention member and the cylinder member received in the first insertion hole and the second insertion hole of the outer shell member.

5. The fuel pump as set forth in claim 1 , in which the valve retention member has a valve accommodation hole formed therein, the valve accommodation hole axially aligning and accommodating the plurality of the valve elements therein.

6. The fuel pump as set forth in claim 1 , in which the outer shell member has a peripheral wall portion, a first closing portion, and a second closing portion, the peripheral wall portion having the first insertion holes formed therein, the first closing portion being arranged to close one end portion in an axial direction of the peripheral wall portion, the second closing portion being arranged to close the other end portion in the axial direction of the peripheral wall portion and having the second insertion hole formed therein.

7. The fuel pump as set forth in claim 6 , in which the outer shell member has a resilient film member arranged therein, the resilient film member being arranged in the vicinity of the first closing portion and receives a pressure of the fuel stored in the fuel storage chamber.

8. The fuel pump as set forth in claim 1 , in which the fuel pressurizing chamber is formed by the plunger and at least either one of the valve retention member and the cylinder member.

9. The fuel pump as set forth in claim 8 , in which the valve retention member is formed by a tubular body penetrating through the outer shell, the cylinder member is connected with the valve retention member in the outer shell member, and the fuel pressurizing chamber is formed by the valve retention member, the cylinder member and the plunger.

10. The fuel pump as set forth in claim 9 , in which the valve retention member has a pair of valve retention tubular portions and an intermediate tubular portion, the pair of valve retention tubular portions being spaced apart from each other in a suction side and a discharge side of the fuel pressurizing chamber and facing each other in an axial direction, the intermediate tubular portion being disposed between the pair of valve retention tabular portions and connected with the cylinder member, and the fuel pressurizing chamber is formed by the intermediate tubular portion of the valve retention member, the cylinder member and the plunger.

11. The fuel pump as set forth in claim 8 , in which the valve retention member is constituted by a tubular body penetrating through the outer shell, the cylinder member is connected with the valve retention member in the outer shell member, and the fuel pressurizing chamber is formed by the cylinder member and the plunger.

12. The fuel pump as set forth in claim 1 , in which the valve retention member penetrates through the inner wall surface of the outer shell member via the pair of first insertion holes and the fuel storage chamber extends from one of the pair of first insertion holes to the other of the pair of first insertion holes.

13. A fuel pump comprising:
a pump body having formed in its inner portion with a fuel passage to allow a fuel to be introduced therethrough into the inner portion,
a plunger provided in the pump body to partly form a fuel pressurizing chamber to allow the fuel to be introduced thereinto and discharged therefrom, the plunger being reciprocatably displaceable in an axial direction in which the fuel in the fuel pressurizing chamber is pressurized, and
a plurality of valve elements inclusive of a suction valve to have the fuel to be sucked into the fuel pressurizing chamber and a discharge valve to have the fuel to be discharged from the fuel pressurizing chamber, the pump body including
a valve retention member partly forming the fuel passage, the valve retention member being in a tubular shape to retain the valve elements therein,
a cylinder member supported by the valve retention member and slidably retaining the plunger, and
an outer shell member having an inner wall surface which the valve retention member penetrates through, the inner wall surface of the outer shell member and an outer surface of the valve retention member collectively constituting a fuel storage chamber,
wherein the fuel pressurizing chamber is formed by the plunger and at least either one of the valve retention member and the cylinder member,
wherein the valve retention member is constituted by a tubular body penetrating through the outer shell, the cylinder member is connected with the valve retention member in the outer shell member, and the fuel pressurizing chamber is formed by the cylinder member and the plunger,
wherein the valve retention member has a pair of val

Assignees

• Usui Takashi
• Asayama Kazuhiro
• Toyota Motor Co Ltd

Inventors

• Usui Takashi
• Asayama Kazuhiro

Classifications

• F02M63/005 Primary

  Pressure relief valves · CPC title

• F02M59/462

  Delivery valves · CPC title

• F02M59/368

  Pump inlet valves being closed when actuated · CPC title

• F02M55/04

  Means for damping vibrations {or pressure fluctuations} in injection pump inlets {or outlets} · CPC title

• F04B7/0015 Primary

  and having a slidable movement · CPC title