# US 12,760,697 B2 · Gas injector having reduced wear and damping device

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- Number: US 12,760,697 B2
- Document ID: US12760697B2
- Status: Granted
- Kind: B2
- Application number: 18/262,606
- Filed: 2021-12-13
- Published: 2024-09-12
- Granted: 2026-10-13
- Earliest claimed: 2021-01-27
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Martin Mueller
- Web page: https://patentgrep.com/patent/US12760697B2

## CPC

- F02M 21/0254: {Electric actuators, e.g. solenoid or piezoelectric}
- F02M 21/0257: {Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages}
- F02M 51/0671: {the armature having an elongated valve body attached thereto}
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A gas injector for injecting a gaseous fuel. The gas injector includes a solenoid actuator including an armature, an internal pole, and a coil; a closure element which opens and closes a gas path on a valve seat, the armature being connected to the closure element; a closed lubricant chamber filled with a lubricant and in which the armature is arranged, the lubricant ensuring the armature is lubricated; a flexible sealing element sealing the lubricant chamber in relation to the gas path, and a braking device which is arranged in the lubricant chamber and is configured to brake the closure element during a process of restoring the gas injector from the open into the closed state. The braking device has a brake pin, a damping chamber that is filled with lubricant and is in fluid communication with the lubricant chamber, and a resilient brake element.

## Claims

### Claim 1

A gas injector for injecting a gaseous fuel, comprising:
a solenoid actuator including an armature, an internal pole, and a coil;
a closure which opens and closes a gas path on a valve seat, wherein the armature is connected to the closure;
a closed lubricant chamber filled with a lubricant and in which the armature is arranged, wherein the lubricant ensures the armature is lubricated;
a flexible sealer which seals the lubricant chamber in relation to the gas path; and
a braking device arranged in the lubricant chamber and configured to brake the closure during a process of restoring the gas injector from an open state into a closed state;
wherein the braking device includes a brake pin, a damping chamber that is filled with lubricant and is in fluid communication with the lubricant chamber, and a resilient brake, wherein the brake pin and the resilient brake can be operatively connected to the closure during the restoring process, and the brake pin is configured, during a process of restoring the gas injector, to displace lubricant out of the damping chamber into the lubricant chamber to damp the restoring of the closure into the closed state,
wherein the brake pin includes a contact surface, which is arranged on a side of the brake pin pointing toward the closure, can be operatively connected to the closure, and is used as the stop surface for the brake pin.

### Claim 2 (depends on 1)

The gas injector as recited in claim 1, wherein the resilient brake is arranged in the damping chamber.

### Claim 3 (depends on 1)

The gas injector as recited in claim 1, wherein the damping chamber is in fluid communication with the lubricant chamber by way of a guide play of the brake pin.

### Claim 4 (depends on 1)

The gas injector as recited in claim 1, further comprising a choke, wherein the damping chamber is in fluid communication with the lubricant chamber by way of the choke.

### Claim 5 (depends on 1)

The gas injector as recited in claim 1, further comprising an armature pin which abuts the closure and is rigidly connected to the armature, wherein an end of the armature pin facing away from the valve seat of the gas injector abuts the brake pin when the gas injector is in the closed state.

### Claim 6 (depends on 5)

The gas injector as recited in claim 5, further comprising an armature pin guide in which the armature pin is guided, wherein the armature pin guide is used as a stop for the brake pin when the injector is in the open state.

### Claim 7 (depends on 1)

The gas injector as recited in claim 1, further comprising a guide member which is arranged in the lubricant chamber and is configured to guide the brake pin.

### Claim 8 (depends on 6)

The gas injector as recited in claim 6, wherein, when the gas injector is in the closed state, a first gap between the brake pin and the armature pin guide has a first width that is smaller than a width of a second gap between the armature and the internal pole.

### Claim 9 (depends on 1)

The gas injector as recited in claim 1, wherein: i) a restoring element restorer for restoring the closure is arranged in the lubricant chamber, and/or ii) a first guide region and a second guide region of the closure are arranged in the lubricant chamber.