# US 2022/0034286 A1 · Injector clamping mechanism

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- Number: US 2022/0034286 A1
- Document ID: US20220034286A1
- Status: Published application
- Kind: A1
- Application number: 17/378,800
- Filed: 2021-07-19
- Published: 2022-02-03
- Earliest claimed: 2020-07-30
- Assignees: Deutz Aktiengesellschaft
- Applicants: DEUTZ Aktiengesellschaft
- Inventors: Johannes KLOSTERBERG; Thomas WERNER; Alfred INDEN
- Web page: https://patentgrep.com/patent/US20220034286A1

## CPC

- F02M 61/14: Arrangements of injectors with respect to engines; Mounting of injectors
- F02M 61/168: {Assembling; Disassembling; Manufacturing; Adjusting}
- F02M 2200/852: provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
- F02M 2200/855: using clamp elements or fastening means, e.g. bolts or screws
- F02M 2200/858: sealing arrangements between injector and engine
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

An internal combustion engine, in particular a diesel engine, in particular of a motor vehicle, includes at least one working cylinder and one cylinder head closing the working cylinder, in which an injector for injecting fuel is situated for the working cylinder. The engine includes a clamping claw for the injector for injecting fuel, whose one end is supported on the other end, in which at least two arms are provided in such a way that one arm of the clamping claw acts upon an injector in each case, and the injector presses against a seat or a seal in the cylinder head in a sealing manner with the aid of a defined force. The engine also include a clamping screw designed as a push-through screw and including a screw head collar and a corresponding thread is provided in the cylinder head, which fastens the clamping claw at the cylinder head. The arms of the clamping claw are designed in such a way that the arms of the clamping claw are supported on a support surface at the injector and on a support surface at the cylinder head.

## Claims

### Claim 1

An internal combustion engine comprising:
a working cylinder;
a cylinder head closing the working cylinder;
an injector in the cylinder head for injecting fuel for the working cylinder;
a clamping claw for fixing the injector, the clamping claw being provided in such a way that a first end of the clamping claw surrounds the injector by two arms and presses the injector against a seat or a seal in the cylinder head in a sealing manner via support surfaces, a second end of the claw being supported on a support surface at the cylinder head, a clamping force of the clamping claw being applied with the aid of a clamping screw configured as a push-through screw connection and including a screw head collar and a corresponding thread in the cylinder head, a position of the screw being situated between the support surfaces at the injector and the support surfaces on the cylinder head.

### Claim 2 (depends on 1)

The internal combustion engine as recited in claim 1, wherein the clamping screw is an expansion screw.

### Claim 3 (depends on 1)

The internal combustion engine as recited in claim 1, further comprising a sleeve arranged concentrically around the clamping screw between the screw head collar and the clamping claw.

### Claim 4 (depends on 3)

The internal combustion engine as recited in claim 3, wherein the clamping screw and sleeve plastically deform the expansion screw.

### Claim 5 (depends on 3)

The internal combustion engine as recited in claim 3, wherein the clamping screw includes three collars at the shaft including a lower collar centering the clamping claw, and a middle collar and an upper collar centering the sleeve.

### Claim 6 (depends on 5)

The internal combustion engine as recited in claim 5, wherein a position of the middle collar at the shaft of the clamping screw is such that a thread of the clamping screw does not engage with a thread of the cylinder head if the sleeve is mounted a wrong way around.

### Claim 7 (depends on 3)

The internal combustion engine as recited in claim 3, wherein the sleeve has a conical surface on its side facing the clamping claw, the conical surface being supported on a spherical mating surface of the clamping claw.

### Claim 8 (depends on 3)

The internal combustion engine as recited in claim 3, wherein the sleeve has two different inner diameters forming a stepped bore.

### Claim 9 (depends on 1)

A method for operating an internal combustion engine:
providing the internal combustion engine as recited in claim 1; and
injecting fuel via the injector into the working cylinder.