# US 10,309,359 B2 · High-pressure fuel pump

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- Number: US 10,309,359 B2
- Document ID: US10309359B2
- Status: Granted
- Kind: B2
- Application number: 15/770,426
- Filed: 2016-10-05
- Published: 2018-10-25
- Granted: 2019-06-04
- Earliest claimed: 2015-10-28
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Karl-Heinz Laepple; Francesco Lucarelli; Dietmar Van Der Linden
- Web page: https://patentgrep.com/patent/US10309359B2

## CPC

- F02M 59/48: Assembling; Disassembling; Replacing
- F02B 77/11: Thermal or acoustic insulation
- F02M 59/102: {Mechanical drive, e.g. tappets or cams (F02M45/063 takes precedence)}
- F02M 59/44: Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston}
- F02M 59/466: {Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means}
- F04B 1/00: Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (machines or pumps with pistons coacting within one cylinder F04B3/00)
- F04B 1/0404: Details or component parts
- F04B 53/002: {by encapsulation}
- F04B 53/16: Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B 53/22: Arrangements for enabling ready assembly or disassembly
- F02M 53/00: Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M 59/366: {Valves being actuated electrically}
- F02M 2200/05: Fuel-injection apparatus having means for preventing corrosion
- F02M 2200/09: Fuel-injection apparatus having means for reducing noise
- F02M 2200/852: provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
- F02M 2200/853: involving use of quick-acting mechanism, e.g. clips
- F02M 2200/9015: Elastomeric or plastic materials
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- 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)

## Abstract

The invention relates to a high-pressure fuel pump (1), in particular of a common rail injection system of an internal combustion engine, having a pump cylinder head (3), having an intake valve (6) arranged in the pump cylinder head (3) in the direction of a pump cylinder axis, and a high-pressure fuel outlet (5) arranged laterally on the pump cylinder head (3), wherein a protective cap (10, 10a) at least partly covering the high-pressure fuel pump (1) is provided. According to the invention, a high-pressure fuel pump (1) having a protective cap (10, 10a) is provided, in which the protective cap (10, 10a) can be mounted without difficulty on an assembled high-pressure fuel pump (1). This is achieved in that a plug (8) having a lateral lead connection (9) is placed on the electrically operated intake valve (6), and the protective cap (1) is formed in two pieces and has two protective cap parts (11a,11b) that can be fitted to each other, or else in that a plug (8) having a lateral lead connection (9) is placed on the electrically operated intake valve (6), and the protective cap (10a) is formed annularly and has a free clearance slot (19) interrupting the ring.

## Claims

### Claim 1

A high-pressure fuel pump (1), comprising
a pump cylinder head (3),
a suction valve (6) arranged in a direction of a pump cylinder axis in the pump cylinder head (3),
a high-pressure fuel outlet (5) arranged laterally on the pump cylinder head (3), and
a ring-shaped protective cap (10a) which at least partially covers the high-pressure fuel pump (1),
wherein an electrical plug (8) with a lateral line connector (9) is mounted onto the electrically actuated suction valve (6), and wherein the protective cap (10a) has a clearance slot (19) which interrupts the ring-shaped protective cap (10a).

### Claim 2 (depends on 1)

The high-pressure fuel pump (1) as claimed in claim 1,
characterized in that the clearance slot (19) has a contour which surrounds the high-pressure fuel outlet (5).

### Claim 3 (depends on 1)

The high-pressure fuel pump (1) as claimed in claim 1,
characterized in that the protective cap (10a) has clamping lugs (20) which adjoin the clearance slot (19) and which interact with a clamping ring (21).

### Claim 4 (depends on 3)

The high-pressure fuel pump (1) as claimed in claim 3,
characterized in that the clamping ring (21) has a covering lug (22) for at least partially covering the clearance slot (19).

### Claim 5 (depends on 1)

The high-pressure fuel pump (1) as claimed in claim 1,
characterized in that the protective cap (10a) has a domed projection which extends in a direction of the electrical plug (8).