Patent ID: 7681564

Claim:
A vehicle piston internal combustion engine ( 10 ) with at least one cylinder and a piston ( 1 ) in the cylinder, said engine comprising: a piston having a recess ( 2 ) and at least two , preferably four quench zones, the quench zones separated at least partially from each other by valve pockets for valves; a cylinder head having a roof shape that is complementary to a roof-shaped geometry of the piston ( 1 ) and that has a first and a second side intersecting in the shape of a gable; the piston ( 1 ) and the cylinder head defining a top and a bottom side of a combustion chamber, with an ignition device, which is arranged at least approximately in the center in the roof shape, and with preferably two inlet valves ( 5 ), which are arranged in the first side ( 6 ), and with preferably two outlet valves ( 4 ), which are arranged in the second side ( 7 ): the recess ( 2 ) extending over both the first side and the second side of the roof shape and having a base, sides that descend approximately vertically to the base, and an indentation; the indentation extending from the base, arranged between a first and a second valve pocket. transitioning into a quench zone, and having at least one edge that breaks up a flow.