# US 2021/0277860 A1 · Fuel injection device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0277860 A1
- Document ID: US20210277860A1
- Status: Published application
- Kind: A1
- Application number: 17/183,980
- Filed: 2021-02-24
- Published: 2021-09-09
- Earliest claimed: 2020-03-09
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Ralf Kromer
- Web page: https://patentgrep.com/patent/US20210277860A1

## CPC

- F02M 61/14: Arrangements of injectors with respect to engines; Mounting of injectors
- F02M 55/025: {Common rails}
- F02M 2200/851: provisions for adjusting the angular, rotational or axial position of injectors
- F02M 2200/853: involving use of quick-acting mechanism, e.g. clips
- F02M 2200/856: characterised by mounting injector to fuel or common rail, or vice versa
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A fuel injection device includes at least one fuel injector and a receiving bore in a cylinder head as well as a receiving opening of a fuel rail for the fuel injector. The fuel injector is sealed using at least one sealing ring against the walls of the receiving opening and secured in the receiving opening with the aid of a fastening element. A compensating element is provided that acts on the fastening element to prevent bending moments as a result of an asymmetrical suspension of the fuel injector at the fastening element from acting on the fuel injector. The fuel injector device is particularly suitable for directly injecting fuel into a combustion chamber of a mixture-compressing, spark-ignition internal combustion engine.

## Claims

### Claim 1

A fuel injection device for a fuel injection system of internal combustion engines, for directly injecting fuel into a combustion chamber, the fuel injection device comprising:
at least one fuel injector;
a fuel rail having an inlet side receiving opening for the fuel injector, the fuel injector being sealed using at least one sealing ring against walls of the receiving opening and being secured in the receiving opening using a fastening element; and
a compensating element that acts on the fastening element.

### Claim 2 (depends on 1)

The fuel injection device as recited in claim 1, wherein the receiving opening for the fuel injector is formed in a connecting piece of the fuel rail.

### Claim 3 (depends on 2)

The fuel injection device as recited in claim 2, wherein the fastening element is a component that is made up of two pin-type legs and that has a one-piece or two-piece design, and that traverses the receiving opening in the connecting piece of the fuel rail for securely suspending the fuel injector.

### Claim 4 (depends on 1)

The fuel injection device as recited in claim 1, wherein the compensating element that acts on the fastening element has a disk-shaped configuration and surrounds an inlet connection or a connecting sleeve of the fuel injector in an installed state.

### Claim 5 (depends on 4)

The fuel injection device as recited in claim 4, wherein the compensating element is shaped in such a way that it forms first and second bearing surfaces together with the fuel injector and with the fastening element.

### Claim 6 (depends on 5)

The fuel injection device as recited in claim 5, wherein on a rail side, the compensating element includes a nose-type convex area that forms a counterpart to the first bearing surface at the fuel injector.

### Claim 7 (depends on 6)

The fuel injection device as recited in claim 6, wherein on a combustion chamber side, the compensating element includes a convex area that forms a counterpart to the second bearing surface.

### Claim 8 (depends on 7)

The fuel injection device as recited in claim 7, wherein the second bearing surface is formed for the compensating element either directly at the fastening element or at a thin disk inserted between the compensating element and the fastening element.

### Claim 9 (depends on 7)

The fuel injection device as recited in claim 7, wherein the compensating element is a two-piece compensating element and the second bearing surface is formed for the compensating element at a bottom part of the two-piece compensating element.

### Claim 10 (depends on 9)

The fuel injection device as recited in claim 9, wherein a top part of the two-piece compensating element and a bottom part of the two-piece compensating element have a disk-shaped design in each case, the top part being mounted at the second bearing surface in the bottom part and the bottom part having two front surfaces protruding radially outward for support on the fastening element.

### Claim 11 (depends on 5)

The fuel injection device as recited in claim 5, wherein axes of the two bearing surfaces are rotated by 90° about a valve longitudinal axis with regard to one another.