High-pressure pump

Patent metadata

Field	Value
Publication number	US-11719208-B2
Application number	US-202117470152-A
Country	US
Kind code	B2
Filing date	Sep 9, 2021
Priority date	Feb 3, 2010
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A high-pressure pump has a metering valve and a valve stopper. The stopper has a regulation portion which an end surface of the valve is brought into contact with. An outer diameter of the regulation portion is equal to an outer diameter of the outer peripheral surface of the valve. A cylindrical sleeve is disposed around the regulation portion. When the end surface of the valve is in contact with the regulation portion, the sleeve covers a tapered surface of the valve.

First claim

What is claimed is:

1. A high-pressure pump configured to perform pre-stroke metering to return a part of fuel, which is suctioned from a fuel gallery into a pressurization chamber, to the fuel gallery, the high-pressure pump comprising:
a housing which forms a contour;
a cylindrical seat body disposed in the housing and having an inner periphery defining a valve seat;
a valve configured to sit on the valve seat by at least a fuel pressure on a side of the pressurization chamber so as to block the pressurization chamber from the fuel gallery;
a stopper having a regulation portion configured to make contact with an end surface of the valve, which is lifted, to regulate a lift amount of the valve from the valve seat, the regulation portion defining an accommodation space at a center of the regulation portion to be filled with fuel;
a cylindrical sleeve disposed around the regulation portion and integrally formed with the regulation portion; and
a fuel passage configured to communicate the pressurization chamber with the accommodation space, wherein
the fuel passage extends in a direction perpendicular to a direction in which the valve is slidable,
the stopper having;
a bottom portion closing an end portion of the accommodation space on a side of the pressurization chamber, and
a stopper passage located between the fuel passage and the pressurization chamber,
the stopper passage is defined by only the stopper, and
the fuel passage is formed in the stopper and configured to communicate the accommodation space with the pressurization chamber in a state where the valve is in contact with the stopper.

2. The high-pressure pump according to claim 1 , wherein
the sleeve and the stopper are formed from a single integral piece structure.

3. The high-pressure pump according to claim 1 , wherein
the sleeve has an open end of which an inner diameter is larger than an outermost diameter of the valve.

4. The high-pressure pump according to claim 1 , wherein
the fuel passage includes a penetrating hole formed in the stopper.

5. The high-pressure pump according to claim 1 , wherein
the sleeve is arranged radially outside of a contacting surface between the valve and the regulation portion.

6. The high-pressure pump according to claim 1 , further comprising:
a spring disposed between the valve and the stopper so as to bias the valve toward the vale seat, wherein
the accommodation space accommodates the spring.

Assignees

• Denso Corp

Inventors

• Inoue Hiroshi

Classifications

• F02M59/466 Primary

  Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means · CPC title

• F02M37/00 Primary

  Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines · CPC title

• F02M37/0023

  Valves in the fuel supply and return system · CPC title

• F02M37/04

  Feeding by means of driven pumps · CPC title

• F02M37/16

  characterised by provision of personally-, e.g. manually-, operated pumps · CPC title