FUEL INJECTION DEVICE

摘要

A fuel injection device, wherein a first valve element (32) and a second valve element (34) are disposed in the pressure switching chamber (30) of a three-way valve (8). When the destination of a fuel flow passage (15) is switched from a high-pressure fuel supply passage (5a) to a low-pressure fuel return passage (26a), the three-way valve is switched from a state in which the first valve element (32) is open and the second valve element (34) is closed to a state in which the first valve element (32) is closed and the second valve element (34) is open after both the first valve element (32) and the second valve element (34) are closed. The valve opening timing of a needle valve (9) is controlled by a fuel pressure at a pressure control port (55) closed by a sliding seal surface (53) formed on the outer periphery of the second valve element (34).