초록 ▼

Disclosed is a combustion chamber of an internal combustion engine. A first raised portion having a flat bottom is formed on the inner wall of the cylinder head so that a first flat squish area is formed between the flat bottom of the first raised portion and the flat peripheral portion of the top f

Disclosed is a combustion chamber of an internal combustion engine. A first raised portion having a flat bottom is formed on the inner wall of the cylinder head so that a first flat squish area is formed between the flat bottom of the first raised portion and the flat peripheral portion of the top face of the piston. A second raised portion is formed on the top face of the piston at a position opposite to the first raised portion with respect to the axis of the piston and has a spherical rear wall so that a second spherical shell shape squish area is formed between the inner wall of the cylinder head and the rear wall of the first raised portion. The first squish flow spouted out from the first squish area moves forward along the top face of the piston. The second squish flow spouted from the second squish area moves forward in the upper interior of the combustion chamber in the direction opposite to the spouting direction of the first squish flow. The first and second squish flows cooperate with each other to create a strong swirl motion rotating about a horizontal axis in the combustion chamber.

대표청구항 ▼

An internal combustion engine compsiring: a cylinder block having a cylinder bore therein; a cylinder head mounted on said cylinder block and having an inner wall; a first raised portion having on its lower end a flat bottom face and formed on the periphery of the inner wall of said cylinder head so

An internal combustion engine compsiring: a cylinder block having a cylinder bore therein; a cylinder head mounted on said cylinder block and having an inner wall; a first raised portion having on its lower end a flat bottom face and formed on the periphery of the inner wall of said cylinder head so as to project downwards; a piston reciprocally movable in said cylinder bore and having a top face which has a flat peripheral portion approachable to said flat bottom face so as to create a first squish area therebetween at the end of the compression stroke for spouting out a first squish flow along the top face of said piston, the inner wall of said cylinder head and the top face of said piston defining a combustion chamber therebetween, said combustion chamber comprising a main combustion chamber and an auxiliary combustion chamber which are interconnected to each other via a connection passage; an intake valve movably mounted on said cylinder head for leading a combustible mixture into said combustion chamber; an exhaust valve movably mounted on said cylinder head for discharging exhaust gas into the atmosphere; a second raised portion formed on the top face of said piston at a position opposite to said first raised portion with respect to an axis of said piston and having a rear face and a front face exposed to said combustion chamber, said rear face being approachable to the inner wall of said cylinder head so as to create a second squish area therebetween at the end of the compression stroke for spouting out a second squish flow which moves forwards in the upper interior of said combustion chamber in a direction opposite to the spouting direction of said first squish flow, said first and second squish flows cooperating with each other to create a strong swirl motion rotating about a horizontal axis in said combustion chamber; a depression formed on the inner wall of said cylinder head, a bottom of said depression being upwardly recessed from the extension of a curved surface defining said second squish area so that said bottom does not disturb said second squish flow, said depression extending from a position near the opening of said connecting passage to a position near a ridge of said second raised portion; and a second spark plug having a spark gap located in said combustion chamber.