Fuel injection valve has compression device that pressurizes fuel remaining in gap according to core movement to displace fuel to region forming fuel passage for fuel ejected through gap

摘要

The valve has an electromagnetic solenoid in a valve body, an axially movable core in the solenoid, a valve needle and a fixed area approached by the core when the needle moves in the closing direction to form a gap between the fixed area and core when the valve closes. A compression device places fuel remaining in the gap under pressure corresponding to the closing movement of the core to displace the fuel to a region forming a fuel passage. The fuel injection valve has an electromagnetic solenoid in a valve body, an axially movable core (4) inside the solenoid, a valve needle (5), a fixed area (8) approached by the core when the needle moves in the closing direction to form a gap (S1) between the fixed area and movable core when the valve closes and a compression device. The compression device places fuel remaining in the gap under pressure corresponding to the movement of the core towards the closing side to displace the fuel to a region forming a fuel passage for fuel ejected through the gap.