# US 2021/0277858 A1 · Fuel Pump

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- Number: US 2021/0277858 A1
- Document ID: US20210277858A1
- Status: Published application
- Kind: A1
- Application number: 16/497,708
- Filed: 2018-03-21
- Published: 2021-09-09
- Earliest claimed: 2017-04-28
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: John Seifert; Jens Leistert; Stefan Brueckl; Christian Dingfelder
- Web page: https://patentgrep.com/patent/US20210277858A1

## CPC

- F02M 59/48: Assembling; Disassembling; Replacing
- F04B 53/16: Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B 53/22: Arrangements for enabling ready assembly or disassembly
- F02M 2200/855: using clamp elements or fastening means, e.g. bolts or screws
- F16B 4/004: {Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment (F16B4/002 takes precedence)}
- F16B 41/002: {Measures against loss of bolts, nuts or pins (devices for fastening nuts to surfaces F16B37/04)}
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)

## Abstract

A fuel pump for a fuel injection system of an internal combustion engine includes a pump housing and a fastening section which is present on the pump housing for fastening the fuel pump to a base, in particular an engine block. The fastening section has a through opening for receiving a holding element for a fastening means, in particular a screw. At least one radially inwardly directed projection is present at least in an end region of the through opening, the end region facing the base in the installed position.

## Claims

### Claim 1

A fuel pump for a fuel injection system of an internal combustion engine, the fuel pump comprising:
a pump housing; and
a fastening section arranged on the pump housing, the fastening section configured to fasten the fuel pump to a base,
wherein the fastening section defines a through opening configured to receive a holding element for a fastener, and
wherein at least one radially inwardly directed first projection is arranged at least in a first end region of the through opening, the first end region facing toward the base in an installed position.

### Claim 2 (depends on 1)

The fuel pump as claimed in claim 1, wherein at least one radially inwardly directed second projection is arranged in a second end region of the through opening, the second end region facing away from the base in the installed position.

### Claim 3 (depends on 1)

The fuel pump as claimed in claim 1, wherein the at least one first projection only extends over a part of an inner circumference of the through opening.

### Claim 4 (depends on 3)

The fuel pump as claimed in claim 3, wherein the at least one first projection includes multiple projections arranged evenly distributed over the inner circumference.

### Claim 5 (depends on 3)

The fuel pump as claimed in claim 3, wherein the at least one first projection includes multiple projections arranged unevenly distributed over the inner circumference.

### Claim 6 (depends on 1)

The fuel pump as claimed in claim 1, wherein the at least one first projection includes a single projection.

### Claim 7 (depends on 1)

The fuel pump as claimed in claim 1, wherein the through opening is punched into the fastening section in such a way that the at least one first projection is produced in the through opening.

### Claim 8 (depends on 1)

The fuel pump as claimed in claim 1, wherein the at least one first projection is produced by a material displacement.

### Claim 9 (depends on 1)

The fuel pump as claimed in claim 1, wherein the at least one first projection, when viewed in an axial direction of the through opening, has an approximately semi-circular outer contour.

### Claim 10 (depends on 1)

The fuel pump as claimed in claim 1, wherein the at least one first projection, when viewed in an axial direction of the through opening, has an outer contour which is elongate when viewed in a circumferential direction.

### Claim 11 (depends on 1)

The fuel pump as claimed in claim 1, wherein the base is an engine block.

### Claim 12 (depends on 1)

The fuel pump as claimed in claim 1, wherein the fastener is a screw.

### Claim 13 (depends on 6)

The fuel pump as claimed in claim 6, wherein the single projection extends over the entire inner circumference of the through opening.

### Claim 14 (depends on 8)

The fuel pump as claimed in claim 8, wherein the material displacement is a caulking.

### Claim 15 (depends on 10)

The fuel pump as claimed in claim 10, wherein the outer contour is curved around a central axis of the through opening.