PURPOSE: To prevent a wall of a communicating path affording communication between a fuel injection nozzle and a sub-combustion chamber from deposition and accumulation of fuel spray for reducing the production of HC and smoke by forming the path to diverge toward the sub-combustion chamber.
CONSTITUTION: A portion of a sub-combustion chamber 1 provided in a cylinder heat 7 communicates to a main combustion chamber 6 through a communicating hole 5. In this case, a path 3 affording communication between a fuel injection nozzle 2 and the sub-combustion chamber 1 is shaped conically to diverge toward the sub-combustion chamber 1. The vertical angle of this cone coincides with the spray angle of a nozzle 2. Also, the diameter of the cone is the minimum diameter in which the spray does not contact the wall of the cone. Thus, fuel spray injected from the nozzle 2 is prevented from depositing and accumulating on the wall of the communicating path 3 to reduce the generation of both HC and smoke.
KAWAGOE MICHIO
FUKUYAMA TADASHI
TOYOTA MOTOR CO LTD