Gas injector having reduced wear

Patent metadata

Field	Value
Publication number	US-12460604-B2
Application number	US-202118010844-A
Country	US
Kind code	B2
Filing date	Apr 12, 2021
Priority date	Jul 2, 2020
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A gas injector for injecting a gaseous fuel. The gas injector includes a solenoid actuator having an armature, an internal pole and a coil; a closing element, which unblocks and seals a gas path at a valve seat, the armature being connected to the closing element; a sealed lubricant chamber, which is filled with a lubricant, and in which the armature is situated, the lubricant ensuring lubrication of the armature; and a flexible sealing element, which seals the lubricant chamber with respect to the gas path, a damping device being situated in the lubricant chamber.

First claim

What is claimed is:

1 . A gas injector for injecting a gaseous fuel, comprising:
a solenoid actuator having an armature, an internal pole, and a coil; a closing element, which unblocks and seals a gas path at a valve seat, the armature being connected to the closing element; a sealed lubricant chamber, which is filled with a lubricant, and in which the armature is situated, the lubricant ensuring lubrication of the armature; and a flexible sealing element, which seals the lubricant chamber with respect to the gas path, a damping device configured to decelerate the closing element during a resetting operation of the gas injector from an open into a closed state, and situated in the lubricant chamber, wherein the damping device includes a damping pin and an elastic damping element; and, the damping pin and the elastic damping element are configured to be brought into operative connection with the closing element and/or the armature, during the resetting operation.

2 . The gas injector as recited in claim 1 , wherein the damping pin is guided in a damping guide element in the lubricant chamber.

3 . The gas injector as recited in claim 2 , wherein in the closed state of the injector, a first axial gap between the damping guide element and the damping pin is smaller than a second axial gap between the armature and the internal pole.

4 . The gas injector as recited in claim 1 , wherein the sealed lubricant chamber is filled completely or partially with lubricant, the lubricant including oil or gasoline or diesel, or grease.

5 . The gas injector as recited in claim 1 , wherein the flexible sealing element is a bellows, the bellows being a metal bellows or a diaphragm.

6 . The gas injector as recited in claim 1 , wherein:
a gas path for the gaseous fuel runs in a region between a valve housing and a solenoid housing of the solenoid actuator; or the gas path of the gaseous fuel runs through a region of the solenoid actuator in which the coil is situated.

7 . The gas injector as recited in claim 1 , wherein the gas injector is an injector that opens outwards.

8 . The gas injector as recited in claim 1 , wherein a mean diameter of the flexible sealing element is equal to a diameter of the valve seat on the valve body, at which the closing element unblocks and seals the gas path.

Assignees

• Bosch Gmbh Robert

Inventors

• Mueller Martin

Classifications

• F02M2200/707

  with means for avoiding fuel contact with actuators, e.g. isolating actuators by using bellows or diaphragms · CPC title

• F02M2200/07

  Fuel-injection apparatus having means for avoiding sticking of valve or armature, e.g. preventing hydraulic or magnetic sticking of parts · CPC title

• F02M61/12

  characterised by the provision of guiding or centring means for valve bodies · CPC title

• F02M61/08

  the valves opening in direction of fuel flow {(F02M61/047 takes precedence)} · CPC title

• F02M21/0257

  Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages · CPC title