Patent ID: 7438043

Claim:
An internal combustion engine comprising: a cylinder block; a clinder head disposed on an upper part of the cylinder block; a piston disposed inside the cylinder block so that a main combustion chamber is defined by cylinder head, the cylinder block and the piston; an auxiliary chamber partition wall coupled to the cylinder head and extending toward the main chamber to form an auxiliary combustion chamber inside an area enclosed by the auxiliary chamber partition wall; and an ignition section configured and arranged to ignite air-fuel mixture within the auxiliary combustion chamber, the auxiliary chamber partition wall having a first portion with a plurality of first jet apertures configured and arranged to project a plurality of first fuel torches toward the piston and a second portion with plurility of second jet apertures configured and arranged to project a plurality of second fuel torches toward the cylinder block when a fuel inside the auxiliary combustion chamber is ignited by the ignition section, the first portion of the auxiliary chamber partition wall having a smaller wall thickness than the second portion of the auxiliary chamber partition wall.