# US 11,028,920 B2 · Piston for electromagnetically actuate able hydraulic valve and hydraulic system with the electromagnetically actuate able hydraulic valve and a signal element

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- Number: US 11,028,920 B2
- Document ID: US11028920B2
- Status: Granted
- Kind: B2
- Application number: 16/045,612
- Filed: 2018-07-25
- Published: 2019-01-31
- Granted: 2021-06-08
- Earliest claimed: 2017-07-27
- Assignees: ECO Holding 1 GmbH
- Applicants: ECO Holding 1 GmbH
- Inventors: Chris Lentz
- Web page: https://patentgrep.com/patent/US11028920B2

## CPC

- F16H 61/0276: {Elements specially adapted for hydraulic control units, e.g. valves}
- C12Q 1/6816: characterised by the detection means (C12Q1/6804 takes precedence)
- F16K 11/07: with cylindrical slides
- F16K 31/42: by means of electrically-actuated members in the supply or discharge conduits of the fluid motor (F16K31/40 takes precedence)
- F16K 47/00: Means in valves for absorbing fluid energy (for pipes F16L55/00)
- F16K 47/01: {Damping of valve members}
- G05D 16/2013: {using throttling means as controlling means}
- G05D 16/2024: {the throttling means being a multiple-way valve}
- G05D 16/2097: {using pistons within the main valve}
- F16H 57/0006: {Vibration-damping or noise reducing means specially adapted for gearings (devices for varying tension of belts, ropes or chains with damping means F16H7/0829; toothed members with construction providing vibration damping F16H55/14; reducing vibrations or noise of the gearbox casing F16H57/028; suppression of vibrations or noise of gear selectors F16H59/0208; control of hydrostatic fluid gearing preventing or reducing vibrations or noise F16H61/4183)}
- F16H 61/30: Hydraulic {or pneumatic} motors {or related fluid control means} therefor
- F16H 2061/0253: {Details of electro hydraulic valves, e.g. lands, ports, spools or springs}
- F16H: GEARING
- C12Q: MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS (immunoassay G01N33/53); COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- 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)}
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

## Abstract

A piston for an electromagnetically actuatable hydraulic valve wherein the piston is configured cylindrical and axially movable along a central opening that extends along a longitudinal axis of a housing of the electromagnetically actuatable hydraulic valve, wherein plural connections of the housing are opened or closed according to a position of the piston wherein the plural connections are flow connected with the central opening, wherein the hydraulic valve is hydraulically actuatable by a signal element, wherein a damping system is provided for reducing oscillations of a signal pressure of the signal element that impacts the piston, and wherein the damping system is configured in the piston that includes a receiving cavity for receiving the damping system.

## Claims

### Claim 1

An electromagnetically actuatable hydraulic valve, comprising:
a piston arranged in a housing; and
a damping system including a first hollow damping element that is axially movable in the piston and a spring element that is axially supported at the piston and at the first hollow damping element,
wherein the piston is configured cylindrical and axially movable along a central opening that extends along a longitudinal axis of the housing of the electromagnetically actuatable hydraulic valve,
wherein plural connections of the housing are opened or closed according to a position of the piston wherein the plural connections are flow connected with the central opening,
wherein the piston is axially movable by a force generated directly at the piston by a hydraulic signal pressure from a signal element,
wherein the damping system reduces oscillations of the force generated directly at the piston by the hydraulic signal pressure from the signal element when the piston is at the position,
wherein an entirety of the damping system including an entirety of the first hollow damping element and an entirety of the spring element is received in a receiving cavity configured in the piston,
wherein the entirety of the damping system always moves together with the piston when the piston moves,
wherein the first hollow damping element seals against the signal pressure along an axial travel range of the first hollow damping element in the piston, and
wherein the first hollow damping element partially envelops the spring element.

### Claim 2 (depends on 1)

The electromagnetically actuatable hydraulic valve according to claim 1, wherein the damping system is configured coaxial with the longitudinal axis.

### Claim 3 (depends on 1)

The electromagnetically actuatable hydraulic valve according to claim 1,
wherein the piston includes an inlet opening of the receiving cavity at a face of the piston that is oriented towards the signal element, and
wherein the damping system is insertable through the inlet opening.

### Claim 4 (depends on 3)

The electromagnetically actuatable hydraulic valve according to claim 3, wherein a cover element with a circular opening is arranged in the inlet opening and closes the inlet opening outside of the circular opening.

### Claim 5 (depends on 1)

The electromagnetically actuatable hydraulic valve according to claim 1, wherein the damping system is axially secured in the piston by a safety element.

### Claim 6 (depends on 1)

The electromagnetically actuatable hydraulic valve according to claim 1, wherein the signal element is an electromagnetic actuator.

### Claim 7 (depends on 1)

A hydraulic system, comprising:
the electromagnetically actuatable hydraulic valve according to claim 1,
wherein the signal element is at least partially received in a receiving opening of the housing.

### Claim 8 (depends on 7)

The hydraulic system according to claim 7, wherein the housing includes additional connections that are flow connected with the receiving opening.

### Claim 9 (depends on 7)

The hydraulic system according to claim 7, wherein the central opening is arranged coaxial with the receiving opening.

### Claim 10 (depends on 1)

The electromagnetically actuatable hydraulic valve according to claim 1, wherein the spring element includes two coaxial coil springs that are wound in opposite directions.