ENGINE COMBUSTION SYSTEM, GASOLINE ENGINE FOR HYBRID VEHICLE, AND VEHICLE

An engine combustion system, comprising a combustion chamber (1) and a valve structure. The combustion chamber is provided with an air intake side gas extrusion structure (2), an exhaust side gas extrusion structure (3), a front end gas extrusion structure (4) and a rear end gas extrusion structure (5); and the air intake side gas extrusion structure, the front end gas extrusion structure and the rear end gas extrusion structure are all flat gas extrusion structures, and the exhaust side gas extrusion structure is an oblique gas extrusion structure. The engine combustion system is conducive to improving the in-cylinder tumble flow ratio and turbulence intensity. Also disclosed are a gasoline engine for a hybrid vehicle and a vehicle.