Automotive fuel pump

Patent metadata

Field	Value
Publication number	US-2016305384-A1
Application number	US-201514690940-A
Country	US
Kind code	A1
Filing date	Apr 20, 2015
Priority date	Apr 20, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

A fuel pump having a housing defining a pump chamber and an inlet and outlet fluidly connected to the pump chamber. A one way check valve is disposed fluidly in series between the pump chamber and the outlet and is oriented to allow fluid flow from the pump chamber and to the outlet when the check valve is open. A venturi tube is fluidly connected in series between the pump chamber and the outlet which effectively dampens noise pulsations. An inlet valve to the pump chamber has an anchor attached to a valve member and the stationary core. A conical surface on the core abuts against a complementary conical surface on the anchor when the valve is either in its fully open or fully closed position.

First claim

We claim:

1 . A fuel pump comprising:
a housing having a pump chamber, an inlet and outlet fluidly connected to said pump chamber, a one way check valve disposed fluidly in series between said pump chamber and said outlet and oriented to allow fluid flow from said pump chamber to said outlet when said check valve is in an open position, a venturi tube fluidly connected in series with said pump chamber and said outlet.

2 . The fuel pump as defined in claim 1 wherein said venturi tube is fluidly positioned upstream from said check valve.

3 . The fuel pump as defined in claim 1 wherein said venturi tube is fluidly positioned downstream from said check valve.

4 . The fuel pump as defined in claim 1 wherein said venturi tube comprises a convergent section, throat and divergent section fluidly in series with each other, said convergent section and divergent section being frusto-conical in shape.

5 . The fuel pump as defined in claim 4 wherein said throat is cylindrical in shape.

6 . The fuel pump as defined in claim 1 and comprising a second venturi tube fluidly connected in series with said first venturi tube.

7 . The fuel pump as defined in claim 6 wherein each venturi tube comprises a convergent section and a divergent section, and wherein the divergent section of said first mentioned venturi tube is upstream from said convergent section of said second venturi tube.

8 . The fuel pump as defined in claim 7 wherein both venturi tubes are positioned downstream from said check valve.

9 . The fuel pump as defined in claim 8 wherein each venturi tube comprises a cylindrical throat connecting its respective convergent and divergent section.

10 . The fuel pump as defined in claim 7 and comprising a cylindrical passageway disposed in series between the divergent section of said first mentioned venturi tube and said convergent section of said second venturi tube.

11 . The fuel pump as defined in claim 1 wherein said venturi tube is formed as a passageway in said housing having one end open to said outlet.

12 . A fuel pump comprising:
a housing having a pump chamber, an inlet and outlet fluidly connected to said pump chamber, an inlet valve movable between an open position in which fluid flow through said inlet and into said pump chamber is permitted, and a closed position in which fluid flow between said inlet and said pump chamber is prevented, said valve having a valve member which cooperates with a valve seat in said housing, an anchor attached to and linearly movable in unison with said valve member, an actuator which linearly displaces said valve member an anchor to actuate said valve between said open and said closed positions, said actuator having a stationary core, wherein a surface on said anchor contacts a surface on said core when said valve is in one of said open and closed positions, and wherein said surfaces on said core and said anchor are complementary and conical in shape.

13 . The fuel pump as defined in claim 12 wherein said surfaces on said core and said anchor are complementary and frusto-conical in shape.

14 . The fuel pump as defined in claim 12 wherein said core surface is an outer surface and said surface on said anchor is an inner surface.

15 . The fuel pump as defined in claim 12 wherein said core surface is an inner surface and said surface on said anchor is an outer surface.

Assignees

• Hitachi Ltd

Inventors

• Avireddi Prashanth
• Seera Nikhil
• Inoue Akira

Classifications

• F02M59/464 Primary

  Inlet valves of the check valve type · CPC title

• F02M59/44

  Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} · CPC title

• F04B7/0076

  the members being actuated by electro-magnetic means · CPC title

• F04B53/16 Primary

  Casings; Cylinders; Cylinder liners or heads; Fluid connections · CPC title

• F04B11/0091

  using a special shape of fluid pass, e.g. throttles, ducts · CPC title