# US 4,394,855 A · Internal combustion engine with externally supplied ignition having an ignition chamber associated with the main combustion chamber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,394,855 A - Document ID: US4394855A - Status: Granted - Kind: A - Application number: 06/261,413 - Filed: 1981-05-07 - Granted: 1983-07-26 - Earliest claimed: 1980-05-10 - Assignees: Robert Bosch GmbH - Inventors: Reinhard Latsch; Ernst Linder; Helmut Maurer; Klaus Muller; Franz Rieger - Web page: https://patentgrep.com/patent/US4394855A ## CPC - F02B 19/12: with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08) - F02B 19/1009: {heating, cooling} - Y02T 10/12: Improving ICE efficiencies - 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 An ignition chamber device is described which has an elongated, rotationally symmetrical form. The wall of the ignition chamber which protrudes into the main combustion chamber of the internal combustion engine has a coaxial overflow conduit embodied by a nozzle and radially extending discharge conduits which extend into the annular chamber which surrounds the nozzle. The ignition chamber is provided with an ignition device which has a central electrode that leads from the outside into the interior and by means of this central electrode the ignition voltage is carried via a conductor path, disposed in the wall, to a wall location opposite the nozzle, from where the ignition spark can leap the gap. A heat pipe is disposed in the nozzle and includes a portion arranged in close proximity to the cylinder wall, which prevents the ignition chamber from becoming overheated and on the other hand also enables the inflowing mixture to be heated up in optimal fashion on the way to the ignition location. ## Claims ### Claim 1 An internal combustion engine having a main combustion chamber with externally supplied ignition having an ignition chamber associated with said main combustion chamber, said ignition chamber arranged to communicate directly with said main combustion chamber via a discharge means and separated therefrom by a first wall in which said discharge means is formed and which partitions off said ignition chamber from said main combustion chamber, said discharge means including a first overflow conduit which is formed by a nozzle that protrudes into said ignition chamber and through which a fuel mixture is directed from said main combustion chamber to said ignition chamber, said discharge means further including at least one additional overflow conduit arranged to discharge a fuel mixture tangentially into an annular chamber formed between an outer circumference of said nozzle and a portion of said ignition chamber wall surrounding said nozzle, said ignition chamber having an ignition device including an electrode terminating radially across the annular chamber from the end of said nozzle which forms a radial spark gap with said nozzle directed toward said wall of said ignition chamber, a heat pipe disposed in a wall of said nozzle and at least in a portion of the ignition chamber wall adjoining cooled portions of the engine and surrounding said nozzle. ### Claim 2 An ignition chamber device for insertion into a combustion chamber wall of an internal combustion engine having a main combustion chamber, said ignition chamber device having an ignition chamber capable of being connected with said main combustion chamber by means of a first wall which partitions off the ignition chamber from the main combustion chamber, a plurality of discharge conduits located in said first wall, said first wall forming a first discharge conduit embodied by a nozzle which protrudes into the interior of said ignition chamber, each of the remaining discharge conduits forming an additional overflow conduit which is directed substantially tangentially into an annular chamber formed between an outer circumference of said nozzle and a portion of the ignition chamber wall surrounding the nozzle, said ignition chamber having an ignition device including an electrode which terminates radially across the annual chamber from the end of said nozzle and forms a spark gap with said nozzle, a heat pipe disposed in the wall of said nozzle and at least in a portion of the ignition chamber wall adjoining cooled parts of the engine and surrounding the nozzle. ### Claim 3 (depends on 1) An internal combustion engine as defined by claim 1, characterized in that said electrode is insulated with respect to ground and a conductor forms a conductor path along said ignition chamber wall to a portion of said ignition chamber wall which is located opposite the end of said nozzle and thereat forms said spark gap relative to said nozzle. ### Claim 4 (depends on 2) An ignition chamber device as defined by claim 2, characterized in that said electrode is insulated with respect to ground and a conductor forms a conductor path along said ignition chamber wall to a portion of said ignition chamber wall which is located opposite the end of said nozzle and thereat forms said spark gap relative to said nozzle. ### Claim 5 (depends on 3) An internal combustion engine as defined by claim 3, characterized in that the ignition device has a central electrode insulated with respect to ground and further wherein said central electrode is provided with an external voltage connection arranged to terminate at the wall of said ignition chamber opposite from said first wall further wherein said central electrode is in contact with said conductor path insulated with respect to ground and further that said conductor path is embodied on its end as an ignition electrode. ### Claim 6 (depends on 4) An ignition chamber device as defined by claim 4, characterized in that the ignition device has a central electrode insulated with respect to ground and further wherein said central electrode is provided with an external voltage connection arranged to terminate at the wall of said ignition chamber opposite from said first wall further wherein said central electrode is in contact with said conductor path insulated with respect to ground and further that said conductor path is embodied on its end as an ignition electrode. ### Claim 7 (depends on 5) An internal combustion engine as defined by claim 5, characterized in that at least a portion of said ignition chamber wall adjoining the wall of the ignition chamber which is provided with said heat pipe is made of ceramic material. ### Claim 8 (depends on 6) An ignition chamber device as defined by claim 6, characterized in that at least a portion of said ignition chamber wall adjoining the wall of the ignition chamber which is provided with said heat pipe is made of ceramic material. ### Claim 9 (depends on 7) An internal combustion engine as defined by claim 7, characterized in that said conductor path is vapor coated onto the ceramic surface of said ignition chamber wall. ### Claim 10 (depends on 8) An ignition chamber device as defined by claim 8, characterized in that said conductor path is vapor coated onto the ceramic surface of said ignition chamber wall. ### Claim 11 (depends on 7) An internal combustion engine as defined by claim 7, characterized in that said conductor path is inserted in a groove of said ignition chamber wall. ### Claim 12 (depends on 8) An ignition chamber device as defined by claim 8, characterized in that said conductor path is inserted in a groove of said ignition chamber wall. ### Claim 13 (depends on 9) An internal combustion engine as defined by claim 9, characterized in that said contact between said central electrode and said conductor path is capable of being furnished by a yielding chip, which blocks entry of said central electrode into said ignition chamber. ### Claim 14 (depends on 10) An ignition chamber device as defined by claim 10, characterized in that said contact between said central electrode and said conductor path is capable of being furnished by a yielding chip, which blocks entry of said central electrode into said ignition chamber.