COMBUSTION CHAMBER IN A DIRECT INJECTION TYPE DIESEL ENGINE

摘要

A combustion chamber arrangement in a direct injection type diesel engine, having a cavity (6) at the top of a reciprocating piston (2) to form a combustion chamber (4), and a fuel injection unit for injecting the fuel toward the cavity. A part of the inner circumferential wall of the cavity (6) is formed in a concave arc shape and constitutes a concave fuel reflecting surface (7b). The concave fuel reflecting surface (7b) is such that the injected fuel is reflected at the concave fuel reflecting surface (7b) and the course of the reflected fuel (G) is shifted continuously from the peripheral region of the cavity toward the central region of the cavity during the upward movement of the piston, to thereby causing a burning flame to propagate from the peripheral region of the cavity toward the central region of the cavity.