Piston, combustion chamber structure and engine

The invention discloses a piston, a combustion chamber structure and an engine, a pit and two protruding structures are arranged at the top of the piston, the pit is arranged between the two protruding structures, and the outer periphery of the section, perpendicular to the height direction of the piston, of the pit is in a square shape. According to the technical scheme, the tumble flow of the combustion chamber structure of the methanol engine is increased, the combustion efficiency of the methanol engine is improved, and meanwhile the structural compactness, the weight and the NVH performance are considered. 本发明公开一种活塞、燃烧室结构和发动机，其中活塞的顶部设有凹坑、及两个凸起结构，凹坑设于两凸起结构之间，凹坑的垂直于活塞的高度方向的截面的外周缘呈方形。本发明的技术方案旨在增大甲醇发动机的燃烧室结构的滚流，提高甲醇发动机的燃烧效率，同时兼顾结构紧凑性、重量、NVH性能。