DIRECT-INJECTION ENGINE COMBUSTION CHAMBER STRUCTURE

摘要

To provide a direct-injection engine combustion chamber structure which produces less NOx or smoke and consumes less fuel by actively combusting the fuel in a squish area. Provided at a top surface 17 of a piston 10 are an inclined surface 19 and an orthogonal surface 20. The inclined surface continuous with an inner peripheral wall surface 16 of a cavity 11 extends outward in a radial direction of the piston 10 and gets shallower toward the outer side in the radial direction of the piston 10, whereas the orthogonal surface continuous with an outer periphery of the inclined surface 19 without a gap extends to an outer peripheral surface 21 of the piston 10 and is orthogonal to a central axis C of the piston 10.