# US 10,480,456 B2 · Gas injector including lift dethrottling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,456 B2 - Document ID: US10480456B2 - Status: Granted - Kind: B2 - Application number: 15/525,678 - Filed: 2015-09-29 - Published: 2017-11-16 - Granted: 2019-11-19 - Earliest claimed: 2014-11-28 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Friedrich Moser; Guenther Hohl; Michael Knorpp; Olaf Schoenrock; Sven Krissler - Web page: https://patentgrep.com/patent/US10480456B2 ## CPC - F02M 21/0257: {Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages} - F02M 21/0269: {Outwardly opening valves, e.g. poppet valves} - F02M 21/0275: {for in-cylinder direct injection, e.g. injector combined with spark plug} - F02M 55/004: {Joints; Sealings} - F02M 61/161: {Means for adjusting injection-valve lift} - F02M 61/20: Closing valves mechanically, e.g. arrangements of springs or weights {or permanent magnets; Damping of valve lift} - F16K 1/36: Valve members (for double-seat valves F16K1/44 {; for butterfly valves F16K1/222, F16K1/223}) - F16K 1/38: of conical shape - F16K 1/42: Valve seats (for double-seat valves F16K1/44) - F16K 25/04: Arrangements for preventing erosion, not otherwise provided for - F16K 31/0655: {Lift valves} - F02M 21/0209: {Hydrocarbon fuels, e.g. methane or acetylene} - F02M 63/0031: {characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details} - F02M 63/0056: {Throttling valves, e.g. having variable opening positions throttling the flow} - F02M 65/005: {Measuring or detecting injection-valve lift, e.g. to determine injection timing} - Y02T 10/30: Use of alternative fuels, e.g. biofuels - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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)} - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A gas injector for injecting a gaseous fuel, in particular directly into a combustion chamber of an internal combustion engine, including: a valve closing element for opening or closing a pass-through opening, a valve body, and a sealing seat between the valve body and the valve closing element, in the case of a maximum lift of the valve closing element a flow cross section between the valve body and the valve closing element being smaller in the flow direction upstream from the sealing seat than a flow cross section between the valve closing element and the sealing seat and being smaller than a flow cross section in the flow direction downstream from the sealing seat. ## Claims ### Claim 1 A gas injector for injecting a gaseous fuel directly into a combustion chamber of an internal combustion engine, comprising: a valve closing element for opening or closing a pass-through opening; a valve body; and a sealing seat between the valve body and the valve closing element; wherein in the case of a maximum lift of the valve closing element, a first flow cross section between the valve body and the valve closing element is smaller in a flow direction upstream from the sealing seat than a second flow cross section between the valve closing element and the sealing seat and is smaller than a third flow cross section in the flow direction downstream from the sealing seat. ### Claim 2 (depends on 1) The gas injector as recited in claim 1, wherein the valve closing element includes an outside cylinder area defining a flow cross section which delimits the through-flow. ### Claim 3 (depends on 1) The gas injector as recited in claim 1, wherein the valve body includes an inside cylinder area defining a flow cross section which delimits the through-flow. ### Claim 4 (depends on 1) The gas injector as recited in claim 1, wherein one of: i) a flow cross section which delimits a through-flow is defined by several bores and recesses in the flow direction upstream from the sealing seat, ii) a flow cross section which delimits a through-flow is defined by a polygonal geometry, or ii) a flow cross section which delimits a through-flow is defined by at least one of an elliptical outer contour and an elliptical inner contour. ### Claim 5 (depends on 1) The gas injector as recited in claim 1, wherein the first flow cross section between the valve body and the valve closing element in the flow direction upstream from the sealing seat is asymmetric to a center axis of the gas injector. ### Claim 6 (depends on 1) The gas injector as recited in claim 1, wherein the gas injector is a gas injector which opens outwardly. ### Claim 7 (depends on 1) The gas injector as recited in claim 1, wherein the flow cross section at the flow cross section in the flow direction upstream from the sealing seat is selected in such a way that at least the speed of sound is reached in this area in the case of an open gas injector. ### Claim 8 (depends on 1) The gas injector as recited in claim 1, wherein the valve body includes a thermal protection device at an end of the valve body on the combustion chamber side. ### Claim 9 (depends on 8) The gas injector as recited in claim 8, wherein the thermal protection device includes a heat dissipation cap having a first heat conduction coefficient which is greater than a heat conduction coefficient of the valve body. ### Claim 10 (depends on 9) The gas injector as recited in claim 9, wherein the thermal protection device includes a first thermal protective layer having a second heat conduction coefficient which is at least one of: i) smaller than the heat conduction coefficient of the valve body, and ii) smaller than the first heat conduction coefficient of the heat dissipation cap. ### Claim 11 (depends on 10) The gas injector as recited in claim 10, wherein the first thermal protective layer is situated on the heat dissipation cap. ### Claim 12 (depends on 9) The gas injector as recited in claim 9, wherein the heat dissipation cap includes a plate-shaped area. ### Claim 13 An injector system, comprising: a gas injector for injecting a gaseous fuel into a combustion chamber; and a cylinder head having a cylinder head opening in which the gas injector is situated, an end of the gas injector facing the combustion chamber being situated in the axial direction at a predetermined distance from an end of the cylinder head opening on the combustion chamber side, wherein the gas injector injects a gaseous fuel directly into the combustion chamber, the gas injector including a valve closing element for opening or closing a pass-through opening, a valve body, and a sealing seat between the valve body and the valve closing element, wherein in the case of a maximum lift of the valve closing element, a first flow cross section between the valve body and the valve closing element is smaller in a flow direction upstream from the sealing seat than a second flow cross section between the valve closing element and the sealing seat and is smaller than a third flow cross section in the flow direction downstream from the sealing seat. ### Claim 14 An internal combustion engine, comprising: a combustion chamber; and a gas injector injects a gaseous fuel directly into the combustion chamber, the gas injector including a valve closing element for opening or closing a pass-through opening, a valve body, and a sealing seat between the valve body and the valve closing element, wherein in the case of a maximum lift of the valve closing element, a first flow cross section between the valve body and the valve closing element is smaller in a flow direction upstream from the sealing seat than a second flow cross section between the valve closing element and the sealing seat and is smaller than a third flow cross section in the flow direction downstream from the sealing seat. ### Claim 15 (depends on 9) The gas injector as recited in claim 9, wherein the heat dissipation cap includes a plate-shaped base area and a wall area situated at the plate-shaped base area.