US 12,140,070 B2
Spark-ignited reciprocating piston internal combustion engine with a pre-chamber ignition system
Erik Schaefer, Munich (DE); and Daniel Taterra, Munich (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 17/799,481
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Jan. 18, 2021, PCT No. PCT/EP2021/050912
§ 371(c)(1), (2) Date Aug. 12, 2022,
PCT Pub. No. WO2021/160374, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 10 2020 103 863.1 (DE), filed on Feb. 14, 2020.
Prior Publication US 2023/0070311 A1, Mar. 9, 2023
Int. Cl. H01T 13/54 (2006.01); F02B 19/12 (2006.01); F02B 19/18 (2006.01)
CPC F02B 19/12 (2013.01) [F02B 19/18 (2013.01); H01T 13/54 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A pre-chamber ignition system of a spark-ignited reciprocating piston internal combustion engine, comprising:
a housing, wherein the housing is installable in a cylinder head of the spark-ignited reciprocating piston internal combustion engine and wherein the housing has a cavity;
an ignition device, wherein the ignition device is disposed in the housing and wherein the ignition device projects into the cavity of the housing; and
a cover, wherein the cavity is covered with respect to a combustion chamber of the spark-ignited reciprocating piston internal combustion engine by the cover, wherein the cover has an aperture, and wherein the cavity and the combustion chamber are connectable together by the aperture in a gas-guiding manner;
wherein the housing consists of a material having a thermal conductivity of more than 170 W/(m*K); and
wherein the cover consists of a material having a thermal conductivity of less than 170 W/(m*K) such that no pre-ignition occurs at a region of maximum power output of the internal combustion engine and wherein the material of the cover is:
tungsten/CuCrlZr 50/50; or
nickel 2.4066; or
steel 1.4859 (20% Cr).