High-pressure fuel pump

Patent metadata

Field	Value
Publication number	US-10801453-B2
Application number	US-201916248165-A
Country	US
Kind code	B2
Filing date	Jan 15, 2019
Priority date	Jan 16, 2018
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

Various embodiments include a high-pressure port for a fuel pump comprising: a body defining an internal volume; an outlet valve with an element opening in a first direction; a pressure-limiting valve with an element opening in an opposite second direction; a common valve plate including a sealing seat for both valve elements; and a sleeve guiding the outlet valve element during movement, fastened in the body with an axial stop limiting movement of the outlet valve element and a radial guide guiding the outlet valve element during movement. The guiding sleeve comprises a harder material than the body.

First claim

The invention claimed is:

1. A high-pressure port for a high-pressure fuel pump of a fuel injection system, the high-pressure port comprising:
a body defining an internal volume;
an outlet valve with an outlet valve element opening in a first direction;
a pressure-limiting valve with a pressure-limiting valve element opening in a second direction opposite the first direction;
a common valve plate including a first sealing seat for the outlet valve element and a second sealing seat for the pressure-limiting valve element;
wherein the first sealing seat for the outlet valve element includes two concentric annular sealing surfaces spaced apart from each other in a radial direction by an encircling annular duct, wherein the two concentric annular sealing surfaces engage with a planar sealing surface of the outlet valve element to close and seal the outlet valve; and
a guiding sleeve guiding the outlet valve element during movement, the guiding sleeve fastened in the body with an axial stop limiting movement of the outlet valve element and a radial guide guiding the outlet valve element during movement.

2. The high-pressure port as claimed in claim 1 , wherein:
the outlet valve includes a return spring for returning the outlet valve element to a closed position; and
the guiding sleeve comprises a spring receiving region for retaining and guiding the return spring.

3. The high-pressure port as claimed in claim 1 , wherein:
the two concentric annular sealing surfaces of the first sealing seat comprise planar, annular sealing surfaces.

4. The high-pressure port as claimed in claim 1 , wherein the valve plate comprises throughflow openings distributed in a uniformly annular manner and opening out into the encircling annular duct.

5. The high-pressure port as claimed in claim 1 , wherein the valve plate is pressed into the body and calked; and
the valve plate comprises an annular relief groove in a region of the second sealing seat dissipating pressing and calking forces.

6. The high-pressure port as claimed in claim 1 , further comprising a spring carrier for a return spring for returning the pressure-limiting valve element into a closed position;
wherein the spring carrier is pressed into the body and comprises a harder material than the body; and
the spring carrier projects beyond an end region of the body in the axial direction.

7. The high-pressure port as claimed in claim 1 , wherein the guiding sleeve comprises a harder material than the body.

8. A high-pressure port for a high-pressure fuel pump of a fuel injection system, the high-pressure port comprising:
a body defining an internal volume;
an outlet valve with an outlet valve element opening in a first direction;
a pressure-limiting valve with a pressure-limiting valve element opening in a second direction opposite the first direction;
a common valve plate including a first sealing seat for the outlet valve element and a second sealing seat for the pressure-limiting valve element; and
a guiding sleeve guiding the outlet valve element during movement, the guiding sleeve fastened in the body with an axial stop limiting movement of the outlet valve element and a radial guide guiding the outlet valve element during movement;
wherein the outlet valve element, the pressure-limiting valve element, a first passage opening in the valve plate, and a second passage opening in the outlet valve element are arranged coaxially.

9. A high-pressure fuel pump for subjecting a fuel in a fuel injection system of an internal combustion engine to high pressure, the pump comprising:
a pump housing in which the fuel is subjected to high pressure;
a high-pressure port arranged in a recess of the housing and welded to the pump housing, wherein the port comprises:
a body defining an internal volume;
an outlet valve with an outlet valve element opening in a first direction;
a pressure-limiting valve with a pressure-limiting valve element opening in a second direction opposite the first direction;
a common valve plate including a first sealing seat for the outlet valve element and a second sealing seat for the pressure-limiting valve element; and
a guiding sleeve guiding the outlet valve element during movement, the guiding sleeve fastened in the body with an axial stop limiting movement of the outlet valve element and a radial guide guiding the outlet valve element during movement;
wherein the guiding sleeve comprises a harder material than the body;

a spring carrier projects beyond an end region of the body of the high-pressure port in an axial direction and is arranged in the housing recess with a clearance fit;
wherein the pump housing forms an angled shoulder in the housing recess with an angle γ≤90°, wherein an end region of the high-pressure port includes a turned groove, and wherein the shoulder and the turned groove interact to form a free space.

Assignees

• Continental Automotive Gmbh
• Vitesco Tech Gmbh

Inventors

• Zankl Markus
• Bohmann Jurgen

Classifications

• F04B53/10

  Valves; Arrangement of valves · CPC title

• F02M61/20

  Closing valves mechanically, e.g. arrangements of springs or weights {or permanent magnets; Damping of valve lift} · CPC title

• F02M59/361

  Valves being actuated mechanically · CPC title

• F02M59/462 Primary

  Delivery valves · CPC title

• F02M55/02 Primary

  Conduits between injection pumps and injectors {, e.g. conduits between pump and common-rail or conduits between common-rail and injectors} · CPC title