# US 9,518,553 B2 · Ignition device for spark ignition engines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,553 B2 - Document ID: US9518553B2 - Status: Granted - Kind: B2 - Application number: 13/963,622 - Filed: 2013-08-09 - Published: 2014-02-27 - Granted: 2016-12-13 - Earliest claimed: 2012-08-21 - Assignees: BorgWarner Ludwigsburg GmbH - Applicants: BorgWarner BERU Systems GmbH - Inventors: Johann Weissenbacher; Matthias Krause; Siegmund Oberer - Web page: https://patentgrep.com/patent/US9518553B2 ## CPC - F02P 1/08: Layout of circuits - F28F 3/06: the means being attachable to the element - H01F 27/08: Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02) - H01F 27/085: {Cooling by ambient air} - H01F 38/12: Ignition, e.g. for IC engines - F02P 3/02: having inductive energy storage, e.g. arrangements of induction coils {(ignition coils structurally combined with sparking plugs F02P13/00; constructional details of ignition coils H01F38/12)} - F28F 2275/14: by using form fitting connection, e.g. with tongue and groove - F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00) - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract The invention relates to an ignition device for an Otto engine, comprising an ignition coil, a printed circuit board, which carries a control circuit with a power transistor, a plastic housing, in which the ignition coil and the printed circuit board are arranged, and a thermal dissipation element, which protrudes through a wall of the plastic housing. In accordance with this disclosure, the printed circuit board carries a cooling body, which is plugged together with the thermal dissipation element to form a thermal bridge, which dissipates thermal losses of the control circuit out from the plastic housing. ## Claims ### Claim 1 An ignition device for an Otto engine, comprising: an ignition coil; a printed circuit board, which carries a control circuit comprising a power transistor; a plastic housing in which the ignition coil and the printed circuit board are arranged; and a thermal dissipation element, which protrudes through a wall of the plastic housing; wherein the printed circuit board carries a cooling body plugged together with the thermal dissipation element to form a thermal bridge, which dissipates thermal losses of the control circuit from the plastic housing; wherein the thermal dissipation element comprises a connector that connects the thermal dissipation element to an engine block; and wherein the thermal dissipation element comprises a bushing spaced away from and connected to the circuit board via a strip that is plugged to the circuit board. ### Claim 2 (depends on 1) The ignition device according to claim 1, wherein the cooling body is soldered onto a metal surface of the printed circuit board. ### Claim 3 (depends on 1) The ignition device according to claim 1, wherein the cooling body is arranged on the same side of the printed circuit board as the power transistor. ### Claim 4 (depends on 1) The ignition device according to claim 1, wherein the thermal dissipation element electrically connects the control circuit to the vehicle ground potential. ### Claim 5 (depends on 1) The ignition device according to claim 1, wherein the thermal dissipation element and the cooling body form a tongue and groove connection. ### Claim 6 (depends on 1) The ignition device according to claim 1, wherein the thermal dissipation element clamps the cooling body or the cooling body clamps the thermal dissipation element. ### Claim 7 (depends on 1) The ignition device according to claim 1, wherein the cooling body is a strip bent in a U-shaped manner having two branches holding the thermal dissipation element between the two branches. ### Claim 8 (depends on 7) The ignition device according to claim 7, wherein the thermal dissipation element is clamped between the two branches. ### Claim 9 (depends on 7) The ignition device according to claim 7, wherein the branch facing away from the printed circuit board comprises an erect end portion at its free end. ### Claim 10 (depends on 7) The ignition device according to claim 7, wherein the branch facing away from the printed circuit board has a protrusion facing towards the other branch. ### Claim 11 (depends on 7) The ignition device according to claim 7, wherein the branch facing away from the printed circuit board has a kink, which forms a protrusion facing towards the other branch. ### Claim 12 (depends on 1) The ignition device according to claim 1, wherein the thermal dissipation element comprises an eyelet for fastening the ignition device on an engine block. ### Claim 13 (depends on 1) The ignition device according to claim 1, wherein the cooling body and the thermal dissipation element are formed from sheet metal. ### Claim 14 (depends on 1) The ignition device according to claim 1, wherein the power transistor is coupled to a further cooling body. ### Claim 15 An ignition device for an Otto engine, comprising: an ignition coil; a printed circuit board carrying a control circuit comprising a power transistor; a plastic housing in which the ignition coil and the printed circuit board are arranged; a thermal dissipation element protruding through a wall of the plastic housing, the thermal dissipation element being adapted to be fastened on an engine block of a vehicle; and a cooling body carried by the printed circuit board; wherein one of the thermal dissipation element and cooling body is clamped to the other to form a thermal bridge, whereby heat generated by the control circuit is transferred outside of the plastic housing; further wherein, the thermal dissipation element comprises a bushing configured to mount the ignition device to the engine block. ### Claim 16 (depends on 15) The ignition device according to claim 15, wherein the cooling body comprises a strip bent in a U-shape having two branches and the thermal dissipation element is clamped between the two branches. ### Claim 17 (depends on 16) The ignition device according to claim 16, wherein the branch facing away from the printed circuit board comprises an erect end portion at its free end. ### Claim 18 (depends on 16) The ignition device according to claim 16, wherein the branch facing away from the printed circuit board has a protrusion facing towards the other branch. ### Claim 19 (depends on 16) The ignition device according to claim 16, wherein the branch facing away from the printed circuit board has a kink, which forms a protrusion facing towards the other branch. ### Claim 20 An ignition device for an Otto engine, comprising: an ignition coil; a printed circuit board, which carries a control circuit comprising a power transistor; a plastic housing in which the ignition coil and the printed circuit board are arranged; and a thermal dissipation element, which protrudes through a wall of the plastic housing; wherein the printed circuit board carries a cooling body plugged together with the thermal dissipation element to form a thermal bridge, which dissipates thermal losses of the control circuit from the plastic housing; and wherein the thermal dissipation element comprises a bushing embedded in the plastic housing, the thermal dissipation element configured to receive a connector that connects the thermal dissipation element to the engine block. ### Claim 21 An ignition device for an Otto engine, comprising: an ignition coil; a printed circuit board, which carries a control circuit comprising a power transistor; a plastic housing in which the ignition coil and the printed circuit board are arranged; and a thermal dissipation element, which protrudes through a wall of the plastic housing; wherein the printed circuit board carries a cooling body plugged together with the thermal dissipation element to form a thermal bridge, which dissipates thermal losses of the control circuit from the plastic housing; wherein the power transistor is coupled to a further cooling body; and wherein the thermal dissipation element is configured to be pushed onto a pin of the engine block and thereby cooled by coolant flowing through the engine block. ### Claim 22 (depends on 21) The ignition device according to claim 21, wherein the printed circuit board is arranged between the further cooling body and the power transistor.