Patent ID: 9347393
Filing Date: 2016-05-24
CPC Classification: F02D,F02M

Claim Text:
1. A fuel injection device, comprising: a valve body that contacts with a valve seat to close a fuel passage, and moves away from the valve seat to open the fuel passage; a needle that executes valve opening/closing operation in cooperation with the valve body; an electromagnet that includes a coil and a magnetic core provided as a driver for driving the needle, and a cylindrical nozzle holder disposed on an outer periphery of the magnetic core and the needle; and an urging unit that urges the valve body in a direction opposite to a direction of a driving force by the driver, in which a current is supplied to the coil to exert a magnetic attractive force between the magnetic core and the needle to open the valve body, wherein the valve body starts the valve closing operation at an intermediate position between a valve closing position where the valve body contacts with the valve seat and a maximum amount of lift of the valve body, and a hydrodynamic force exerted on the valve body and the needle in a valve closing direction is increased up to at least a lift position where the valve closing operation starts.