# US 6,293,252 B1 · Fuel injection device for internal combustion engines

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- Number: US 6,293,252 B1
- Document ID: US6293252B1
- Status: Granted
- Kind: B1
- Application number: 09/450,518
- Filed: 1999-11-29
- Granted: 2001-09-25
- Earliest claimed: 1999-04-14
- Assignees: Hydraulik-Ring GmbH
- Inventors: Bernd Niethammer; Martin Lenk; Steffen Martin
- Web page: https://patentgrep.com/patent/US6293252B1

## CPC

- F02M 57/026: {Construction details of pressure amplifiers, e.g. fuel passages or check valves arranged in the intensifier piston or head, particular diameter relationships, stop members, arrangement of ports or conduits}
- F02M 45/04: with a small initial part {, e.g. initial part for partial load and initial and main part for full load}
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

The invention relates to a fuel injection device for internal combustion engines, preferably Diesel engines. The device has at least one control valve by means of which a control piston is displaceable by a pressure medium in order to convey fuel through at least one channel toward a combustion chamber of the internal combustion engine. The device has at least one accumulator for the pressure medium disposed in a flow direction of the pressure medium, whereby the accumulator is provided within the control piston.

## Claims

### Claim 1

A fuel injection device for internal combustion engines comprising:
a housing means having at least one channel;
a control piston provided within said housing means;
at least one control valve that is disposed on said housing, whereby a control valve displaces said control piston by means of a pressure medium for conveying fuel via said at least one channel in the direction of a combustion chamber of said internal combustion engine; and
at least one accumulator for said pressure medium disposed in a flow direction of said pressure medium, whereby said accumulator is provided within said control piston, and wherein said accumulator is provided with a biased accumulator piston.

### Claim 2 (depends on 1)

A fuel injection device according to claim 1, wherein said accumulator is displaceably arranged within said control piston.

### Claim 3 (depends on 2)

A fuel injection device according to claim 2, wherein said accumulator piston is displaceable against a spring force.

### Claim 4 (depends on 1)

A fuel injection device according to claim 1, wherein said accumulator is provided with a cover plate which, in conjunction with said accumulator piston, delimits an accumulating space.

### Claim 5 (depends on 4)

A fuel injection device according to claim 4, wherein said accumulating space is connected by at least one throttle to a line for feeding said pressure medium to said accumulating space.

### Claim 6 (depends on 5)

A fuel injection device according to claim 5, wherein said throttle is arranged within said cover plate.

### Claim 7 (depends on 5)

A fuel injection device according to claim 5, wherein said accumulating space is connected to said line for said pressure medium by at least one intake valve which opens up into said accumulating space.

### Claim 8 (depends on 7)

A fuel injection device according to claim 7, wherein said intake valve is provided within said cover plate.

### Claim 9 (depends on 4)

A fuel injection device according to claim 4, wherein said cover plate is mounted within said control piston.

### Claim 10 (depends on 9)

A fuel injection device according to claim 9, wherein said accumulator piston is provided with an annular shoulder for resting against said control piston.

### Claim 11 (depends on 1)

A fuel injection device according to claim 1, which includes means for adjusting a pressure acting on a capacity of said accumulator.

### Claim 12 (depends on 1)

A fuel injection device according to claim 1, wherein said control valve is connected to a control unit.

### Claim 13 (depends on 1)

A fuel injection device according to claim 1, wherein said piston has a receiving cavity for receiving said accumulator piston and wherein said receiving cavity is vented to the outside.

### Claim 14 (depends on 1)

A fuel injection device according to claim 1, wherein said control piston acts upon a pressure intensifying piston.

### Claim 15 (depends on 14)

A fuel injection device according to claim 14, wherein said pressure intensifying piston conveys fuel in a direction of nozzle openings.

### Claim 16 (depends on 14)

A fuel injection device according to claim 14, wherein said accumulator is arranged at a surface of said control piston, wherein said surface lies opposite said pressure intensifying piston.