# US 11,078,874 B2 · Valve for metering a fluid

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- Number: US 11,078,874 B2
- Document ID: US11078874B2
- Status: Granted
- Kind: B2
- Application number: 16/266,374
- Filed: 2019-02-04
- Published: 2019-08-08
- Granted: 2021-08-03
- Earliest claimed: 2018-02-08
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Martin Buehner; Matthias Boee; Nico Herrmann; Stefan Cerny; Tim Oliver Alheit
- Web page: https://patentgrep.com/patent/US11078874B2

## CPC

- F02M 51/066: {the armature and the valve being allowed to move relatively to each other or not being attached to each other}
- F02M 51/0625: {characterised by arrangement of mobile armatures}
- F16K 31/0696: {Shock absorbing, e.g. using a dash-pot}
- F02M 55/008: {Arrangement of fuel passages inside of injectors}
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

A valve for metering fluids, for fuel injection valves for internal combustion engines, includes an electromagnetic actuator in a housing and a valve needle actuatable by an armature of the actuator, which actuates a valve closing body interacting with a valve-seat surface to form a sealing seat. The armature is movably guided on the valve needle. A stop element connected to the valve needle limits, with an actuation of the valve needle, a relative motion between the armature and the valve needle. The stop element includes at least one elastically deformable part and one stop piece, the elastically deformable part being shaped as a sleeve, and the stop element being configured so that the armature, upon the limitation of the relative motion between the armature and the valve needle, initially contacts the elastically deformable part and impacts the stop piece after a corresponding elastic deformation of the elastically deformable part.

## Claims

### Claim 1

A valve for metering a fluid, which is a fuel injection valve for an internal combustion engine, comprising:
an electromagnetic actuator situated in a housing;
a valve needle actuatable by an armature of the electromagnetic actuator, for actuating a valve closing body which interacts with a valve-seat surface to form a sealing seat, the armature being movably guided on the valve needle; and
at least one stop element connected to the valve needle, which, in connection with an actuation of the valve needle, limits a relative motion between the armature and the valve needle;
wherein the stop element includes at least one elastically deformable part and one stop piece, wherein the elastically deformable part is configured at least partially in the form of a sleeve, and wherein the stop element is configured so that the armature, upon the limitation of the relative motion between the armature and the valve needle, initially contacts the elastically deformable part and impacts the stop piece only after a corresponding elastic deformation of the elastically deformable part,
wherein the elastically deformable part includes multiple slots which divide the elastically deformable part into segments and which are open on a contact surface of the elastically deformable part and which extend from the contact surface up to an annular section of the elastically deformable part, at which the armature initially contacts the elastically deformable part upon the limitation of the relative motion between the armature and the valve needle, wherein a pair of adjacent sides of a pair of neighboring ones of the segments are parallel,
wherein the contact surface moves radially outward relative to a longitudinal axis of the valve needle when a distance predefined between the contact surface and a stop surface of the stop piece shortens upon the limitation of the relative motion between the armature and the valve needle.

### Claim 2 (depends on 1)

The valve of claim 1, wherein the elastically deformable part is based, at least in some areas, on a hollow cone-shaped basic shape as viewed along the longitudinal axis of the valve needle, and wherein the hollow cone-shaped basic shape radially expands, relative to the longitudinal axis, toward a front face of the armature facing the stop element.

### Claim 3 (depends on 1)

The valve of claim 1, wherein the slots extend in a projection, which extends along the longitudinal axis of the valve needle into a plane oriented perpendicularly to the longitudinal axis, as viewed at least essentially radially.

### Claim 4 (depends on 1)

The valve of claim 1, wherein, upon the limitation of the relative motion between the armature and the valve needle, a damping chamber limited by a front face of the armature is formed within the elastically deformable part, and, upon the limitation of the relative motion between the armature and the valve needle at the stop element, a volume of the damping chamber is reduced.

### Claim 5 (depends on 4)

The valve of claim 4, wherein the elastically deformable part includes multiple slots and the slots are configured so that, upon the limitation of the relative motion between the armature and the valve needle at the stop element, a pressure in the volume of the damping chamber at least intermittently increases.

### Claim 6 (depends on 1)

The valve of claim 1, wherein the stop piece is situated within the elastically deformable part.

### Claim 7 (depends on 1)

The valve of claim 1, wherein the stop element is configured so that the armature, in a starting position, rests against the elastically deformable part and is spaced apart from the stop surface of the stop piece.

### Claim 8 (depends on 1)

The valve of claim 1, wherein a stiffness of the elastically deformable part is predefined to be such that the armature, in a starting position, rests against the elastically deformable part and is spaced apart from the stop surface of the stop piece.

### Claim 9 (depends on 1)

The valve of claim 1, wherein a contact surface of the elastically deformable part, at which the armature initially contacts the elastically deformable part upon the limitation of the relative motion between the armature and the valve needle, is situated, viewed along the longitudinal axis of the valve needle, closer to a front face of the armature, facing the stop element, than the stop surface formed on the stop piece.