COMBUSTION CHAMBER STRUCTURE FOR ENGINE

Japanese Patent JP2022083621

A

To provide a combustion chamber structure for an engine capable of improving engine output while suppressing knocking, and of compatibly improving fuel consumption performance and improving the engine output.SOLUTION: A crown surface 50 of a piston 5 includes an exhaust side bottom part 51 at the exhaust side edge, an intake side bottom part 52 at the intake side edge, an exhaust side inclined surface 53 tending from the exhaust side bottom part 51 to the center part of the crown surface 50, an intake side inclined surface 54 tending from the intake side bottom part 52 to the center part of the crown surface 50, and a plane 55, the plane 55 being provided continuously between the upper end of the exhaust side inclined surface 53 and the upper end of the intake side inclined surface 54. Lfr/h as a ratio between a longitudinal width Lfr as the width of the plane 55 in the direction perpendicular to the direction that the intake side and the exhaust side face each other, and a mountain height h as the height of an upheaval part formed by the exhaust side inclined surface 53, the intake side inclined surface 54 and the plane 55 satisfies a relationship of 6.0