Four-cycle engine

Details Four-cycle engine Four-cycle engine

F - Mech Eng,Light,Heat,Weapons

02

F

F02F 1/24 (2006.01) F01L 1/14 (2006.01) F01L 1/18 (2006.01) F01L 1/26 (2006.01) F02B 75/24 (2006.01) F02B 75/40 (2006.01) F01M 11/03 (2006.01) F02B 75/02 (2006.01) F02B 75/18 (2006.01)

Patent

CA 2360045

To provide a four-cycle engine, in which a pair of intake valve ports openable/closable by respective intake valves and a pair of exhaust valve ports openable/closable by respective exhaust valves are provided in a cylinder head in such a manner as to be positioned on both sides of a first virtual plane containing the axial line of a cylinder bore and passing through an approximately central portion of a combustion chamber, and a pair of ignition plugs are mounted in the cylinder head, characterized by minimizing the degradation of a flame propagation condition even if there occurs accidental fire in either of both the ignition plugs. A pair of ignition plugs 80, which are disposed substantially symmetrically with respect to a second virtual plane 79 passing through the center of a combustion chamber 17R and being perpendicular to a first virtual plane 78, are mounted in a cylinder head 15R in such a manner as to have axial lines extending substantially in parallel to the first virtual plane 78 and to be tilted with a distance therebetween becoming smaller toward the combustion chamber 17R; and end portions, projecting in the combustion chamber 17R, of the ignition plugs 80 are disposed in a region surrounded by intake valve ports 76 and exhaust valve ports 77.

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