FUEL INJECTION DEVICE, AND RECIPROCATING INTERNAL COMBUSTION ENGINE THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide a fuel injection device capable of reducing generation quantity of NOx to the minimum, and a reciprocating internal Combustion engine provided with that. SOLUTION: A return passage 18 to return a part of fuel F directed from a plunger 12 toward a delivery valve 14 to a fuel supply source 11, and a subsidiary valve 20 to close or open that are provided, thereby injection of fuel, into a combustion chamber can be conducted in two stages of a preliminary injection process and a main injection process.