US 12,264,644 B2
Gas injector having a short axial design
Martin Mueller, Moeglingen (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 18/554,974
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Feb. 25, 2022, PCT No. PCT/EP2022/054745
§ 371(c)(1), (2) Date Nov. 6, 2023,
PCT Pub. No. WO2022/218596, PCT Pub. Date Oct. 20, 2022.
Claims priority of application No. 10 2021 203 738.0 (DE), filed on Apr. 15, 2021.
Prior Publication US 2024/0209821 A1, Jun. 27, 2024
Int. Cl. F02M 63/00 (2006.01); F02M 21/02 (2006.01)
CPC F02M 63/0001 (2013.01) [F02M 21/0254 (2013.01); F02M 21/0263 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A gas injector for injecting a gaseous fuel, comprising:
a magnetic actuator including an armature, an inner pole, and a coil;
a closing element including a valve needle, wherein the closing element opens and closes a gas path at a sealing seat, wherein the armature is connected to the closing element;
a closed lubricant chamber filled with a lubricant and in which the armature is disposed, wherein the lubricant lubricates the armature;
a flexible sealing element which seals the lubricant chamber with respect to the gas path;
a restoring element which resets the closing element to a closed starting position;
a first needle guide which is formed between a guide sleeve and the valve needle; and
a braking device configured to slow the closing element during a resetting operation of the gas injector from an open state to a closed state is disposed in the lubricant chamber;
wherein the first needle guide is disposed in the lubricant chamber radially inside the flexible sealing element; and
wherein the restoring element is disposed in the lubricant chamber at least partly, inside the flexible sealing element.