# US 2014/0360447 A1 · Gas exchange valve of an internal combustion engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360447 A1 - Document ID: US20140360447A1 - Status: Published application - Kind: A1 - Application number: 14/301,779 - Filed: 2014-06-11 - Published: 2014-12-11 - Earliest claimed: 2013-06-11 - Assignees: Mahle International GmbH - Applicants: Mahle International GmbH - Inventors: Peter Kroos; Christoph Luven; Alexander Mueller; Alexander Puck - Web page: https://patentgrep.com/patent/US20140360447A1 ## CPC - F01L 3/20: Shapes or constructions of valve members, not provided for in preceding subgroups of this group - F01L 3/00: Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof - F01L 3/14: by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve - F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES ## Abstract A gas exchange valve of an internal combustion engine may include a hollow valve stem and a valve disc. The valve disc may include a valve bottom and a hollow valve cone which is connected to an outer edge of said valve bottom. The hollow valve cone may taper with increasing distance from the valve bottom. The valve stem may pass through the hollow valve cone. The valve stem may be fixedly connected on the one hand to the valve bottom and on the other hand to the tapered end of the valve cone. The valve stem may include a first hollow space which is fluidically separated from a second hollow space arranged in the valve disc. The first hollow space and the second hollow space may have a different cooling agent filling level. ## Claims ### Claim 1 A gas exchange valve of an internal combustion engine, comprising: a hollow valve stem and a valve disc, the valve disc includes a valve bottom and a hollow valve cone, which is connected to an outer edge of said valve bottom, the hollow valve cone tapers with increasing distance from the valve bottom, and the valve stem passes through the hollow valve cone, the valve stem fixedly connected on the one hand to the valve bottom and on the other hand to the tapered end of the valve cone, wherein the valve stem includes a first hollow space, which is fluidically separated from a second hollow space arranged in the valve disc, and the first hollow space and the second hollow space have a different cooling agent filling level. ### Claim 2 (depends on 1) The gas exchange valve according to claim 1, wherein at least one hollow space includes a cooling agent filled therein. ### Claim 3 (depends on 2) The gas exchange valve according to claim 2, wherein the cooling agent comprises sodium. ### Claim 4 (depends on 1) The gas exchange valve according to claim 1, wherein at least one of: at least the valve disc has a nitriding layer and the entire gas exchange valve has the nitriding layer. ### Claim 5 (depends on 4) The gas exchange valve according to claim 4, wherein the nitriding layer is between 1-20 μm thick. ### Claim 6 (depends on 1) The gas exchange valve according to claim 1, wherein the valve cone includes a wall thickness of 1.0 mm or less. ### Claim 7 (depends on 1) The gas exchange valve according to claim 1, wherein the first hollow space includes an inner diameter at least ⅔ of an outer diameter of the valve stem. ### Claim 8 (depends on 1) The gas exchange valve according to claim 1, wherein the gas exchange valve includes at least one of a 601H-steel, an 800H-steel, a 286-steel and a 602H-steel. ### Claim 9 (depends on 1) The gas exchange valve according to claim 1, wherein the valve stem at the connection to the valve bottom has a larger diameter than at the connection to the valve cone. ### Claim 10 An internal combustion engine, comprising: at least one cylinder and at least one associated gas exchange valve, the gas exchange valve including: a valve disc including a valve bottom and a hollow valve cone coupled to an outer periphery of the valve bottom, the valve cone tapering with increasing distance from the valve bottom to define an opening; a hollow valve stem extending through the opening of the valve cone, the valve stem fixedly coupled to the valve bottom and the valve cone, the valve stem defining a first hollow space fluidically separated from a second hollow space arranged in the valve disc; wherein the first hollow space and the second hollow space have a different cooling agent filling level. ### Claim 11 (depends on 10) The internal combustion engine according to claim 10, wherein at least one hollow space includes a cooling agent filled therein. ### Claim 12 (depends on 10) The internal combustion engine according to claim 10, wherein at least one of the valve disc has a nitriding layer and the gas exchange valve has the nitriding layer. ### Claim 13 (depends on 12) The internal combustion engine according to claim 12, wherein the nitriding layer includes a thickness between 1-20 μm. ### Claim 14 (depends on 10) The internal combustion engine according to claim 10, wherein the valve cone includes a thickness of 1.0 mm or less. ### Claim 15 (depends on 10) The internal combustion engine according to claim 10, wherein the first hollow space includes an inner diameter of at least ⅔ an outer diameter of the valve stem. ### Claim 16 (depends on 10) The internal combustion engine according to claim 10, wherein the valve stem defines a first diameter at the coupling with the valve bottom and a second diameter at the coupling with the valve cone, wherein the first diameter is larger than the second diameter. ### Claim 17 (depends on 1) The gas exchange valve according to claim 1, wherein the first hollow space includes a cooling agent filled therein. ### Claim 18 (depends on 7) The gas exchange valve according to claim 7, wherein the valve stem defines a first diameter at the connection with the valve bottom and a second diameter at the connection with the valve cone, wherein the first diameter is larger than the second diameter. ### Claim 19 (depends on 18) The gas exchange valve according to claim 18, wherein the valve cone includes a wall thickness of 1.0 mm or less. ### Claim 20 A gas exchange valve for an internal combustion engine, comprising: a valve disc including a valve bottom and a hollow valve cone coupled to an outer periphery of the valve bottom, the valve cone tapering with increasing distance from the valve bottom to define an opening; a hollow valve stem extending through the opening of the valve cone, the valve stem fixedly connected to the valve bottom and the valve cone, the valve stem including a first diameter at the connection with the valve bottom and a second diameter at the connection with the valve cone, wherein the first diameter is larger than the second diameter; and wherein the valve stem defines a first hollow space fluidically separated from a second hollow space arranged in the valve disc, the first and second hollow space including a different cooling agent filling level.