Abstract: The present invention takes as its objective to provide a fuel injection device, and a diesel engine equipped therewith, which can reduce the amount of NOx in the exhaust gas while maintaining the rate of fuel consumption satisfactory. This fuel injection device includes a pressure accumulator which accumulates fuel whose pressure has been elevated, a fuel injection valve which opens by the supply of the fuel from the pressure accumulator and injects the fuel, a supply conduit which supplies fuel from the pressure accumulator to the fuel injection valve, and two valve apparatuses which are connected in the supply conduit in parallel and each of which interrupts fuel supply to the fuel injection valve. And the fuel flow amount when one of the electromagnetic valves is open is set to be smaller than the fuel flow amount when the other electromagnetic valve is open; and, during fuel supply to the fuel injection valve, an electromagnetic valve opens first, and next an electromagnetic valve opens.

Abstract: An injection system for a dual-fuel diesel engine operated by means of a main fuel having a low cetane number and an auxiliary fuel having a high cetane number is disclosed. The injection system includes a pressure regulating check valve provided in parallel to a delivery valve in a main fuel injection pump and allowing fuel flow only in a direction opposite to that in the delivery valve. A control valve feeds the auxiliary fuel pressurized by a fuel feed pump to a fuel injection valve at an appropriate feed rate and at appropriate fuel feed timing regulated by a control device. A check valve is provided in the proximity of a fuel reservoir of the fuel injection valve in a flow passageway of the auxiliary fuel.

Abstract: A fuel injection device in which a fuel injection pump is connected through a fuel injection pipe to a fuel injection nozzle. The inner diameter of the fuel injection pipe is reduced from the side of the fuel injection pump towards the side of the fuel injection nozzle in either a stepwise manner or continuously.