# US 11,306,684 B2 · Gas injector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,684 B2 - Document ID: US11306684B2 - Status: Granted - Kind: B2 - Application number: 16/640,974 - Filed: 2018-08-21 - Published: 2020-06-18 - Granted: 2022-04-19 - Earliest claimed: 2017-08-22 - Assignees: Eugen Seitz AG - Applicants: Eugen Seitz AG - Inventors: Michael Bronner - Web page: https://patentgrep.com/patent/US11306684B2 ## CPC - F02M 21/0254: {Electric actuators, e.g. solenoid or piezoelectric} - F02M 21/0269: {Outwardly opening valves, e.g. poppet valves} - F02B 19/00: Engines characterised by precombustion chambers - F02M 21/0215: {Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas} - F02M 21/0296: {Manufacturing or assembly; Materials, e.g. coatings} - Y02T 10/30: Use of alternative fuels, e.g. biofuels - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A gas injector has an injector lance, a drive unit, a push rod and a valve. The injector lance has a free end for injecting gas into an external unit. The drive unit generates a linear movement of the push rod, as a result of which the push rod actuates the valve and exposes a valve through-passage opening, in order for the gas to be injected. The valve through-passage opening is arranged in the region of the free end of the injector lance ). The gas injector can be designed to be relatively small and narrow. It minimizes switching delays, avoids dead spaces and prevents contamination of the valve. ## Claims ### Claim 1 A gas injector having an injector lance, a drive unit, a tappet rod and a valve, wherein the injector lance has a free end for injecting gas into an external unit, wherein the drive unit generates a linear movement of the tappet rod, whereby the tappet rod actuates the valve and releases a valve passage opening in order to inject the gas, wherein the valve passage opening is arranged in a region of the free end of the injector lance, wherein the injector lance has a shaft and the tappet rod is arranged within the shaft and is linearly displaceable relative thereto, wherein the free end of the injector lance is formed by a valve body, wherein the valve body is arranged at a free end of the shaft, wherein the valve body has a through-opening, which extends through the entire valve body and wherein the valve body comprises a first portion which forms a front free end of the gas injector, wherein the first portion merges into a second portion via a first taper, wherein, in the region of the first portion to the front end of the gas injector, the diameter of the through-opening is widened, and wherein the through-opening comprises in this region a constant diameter, until it leads in direction opposite to the outflow direction of the gas to a radially extending ledge or balcony, which serves as a stop and which forms the valve seat. ### Claim 2 (depends on 1) The gas injector as claimed in claim 1, wherein the valve is a sole valve of the gas injector. ### Claim 3 (depends on 1) The gas injector as claimed in claim 1, wherein the drive unit comprises a solenoid unit, wherein the tappet rod is connected to an armature plate of the solenoid unit, and wherein the armature plate is movable by actuating an electromagnet of the solenoid unit. ### Claim 4 (depends on 3) The gas injector as claimed in claim 3, wherein an armature spindle is present which connects the tappet rod to the armature plate, wherein the armature spindle passes through the electromagnet. ### Claim 5 (depends on 4) The gas injector as claimed in claim 4, wherein the armature spindle is solid. ### Claim 6 (depends on 1) The gas injector as claimed in claim 1, wherein the valve has a valve cone having a valve rod and a valve disk arranged thereon, and wherein the valve rod is connected to the tappet rod and is linearly displaceable together therewith. ### Claim 7 (depends on 6) The gas injector as claimed in claim 6, wherein the valve rod is solid. ### Claim 8 (depends on 6) The gas injector as claimed in claim 6, wherein the valve disk has a sealing face directed contrary to a discharge direction of the gas, which lies in a sealing manner against the valve seat in order to thereby close the valve passage opening and therefore the valve. ### Claim 9 (depends on 8) The gas injector as claimed in claim 8, wherein the valve cone is displaceable in the discharge direction in order to open the valve. ### Claim 10 (depends on 6) The gas injector as claimed in claim 6, wherein a closing spring is present between the tappet rod and the valve cone, which closing spring holds the valve in the closed position and/or closes it. ### Claim 11 (depends on 10) The gas injector as claimed in claim 10, wherein the drive unit comprises a solenoid unit and wherein the tappet rod is connected to an armature plate of the solenoid unit, wherein the armature plate is movable by actuating and electromagnet of the solenoid unit and wherein a second spring is present, which, after a closing procedure of the valve, brings at least the tappet rod back into a starting position, wherein the second spring has a spring force which is lower than the spring force of the closing spring. ### Claim 12 (depends on 11) The gas injector as claimed in claim 11, wherein the second spring brings all moving parts of the drive unit back into the starting position. ### Claim 13 (depends on 6) The gas injector as claimed in claim 6, wherein the valve cone is uncoupled from the tappet rod as the valve closes. ### Claim 14 (depends on 6) The gas injector as claimed in claim 6, wherein the valve-through opening is produced between the valve disk and the valve seat when the valve opens. ### Claim 15 (depends on 1) The gas injector as claimed in claim 1, wherein the tappet rod is hollow.