Patent ID: 8646704

Claim:
An injector comprising: a cylindrical housing that includes a nozzle hole on one end side of the housing in an axial direction of the housing, wherein fuel is injected through the nozzle hole; a fixed core that is fixed in the housing; a cylindrical movable core that is disposed in the housing between the fixed core and the nozzle hole in the axial direction to reciprocate in the housing in the axial direction, wherein: an inner peripheral surface of the housing guides an outer peripheral surface of the movable core in the axial direction; the inner peripheral surface of the housing and the outer peripheral surface of the movable core define an outer radial clearance therebetween; when fuel is injected, the movable core is magnetically attracted to the fixed core to be contactable with the fixed core along a whole circumference of the movable core; and the movable core includes an insertion hole which passes through a radially central part of the movable core in the axial direction; a valve member that is disposed in the housing to reciprocate in the axial direction, so that the valve member opens and closes the nozzle hole to inject fuel and stop injecting fuel through the nozzle hole, wherein the valve member includes: a shaft-shaped portion extending in the axial direction and inserted in the insertion hole, an outer peripheral surface of the shaft-shaped portion and an inner peripheral surface of the insertion hole defining an inner radial clearance therebetween, the inner radial clearance and the outer radial clearance being sized so as to permit an inclination of the valve member relative to the housing and the movable core; and a stopper portion which projects from the shaft-shaped portion on a fixed core-side of the movable core in a flanged manner radially outward of the shaft-shaped portion to be contactable with the movable core, and which includes a stopper inclined surface around an axis of the shaft-shaped portion, the stopper inclined surface being inclined radially inward of the shaft-shaped portion in the axial direction toward the nozzle hole such that an outer diameter of at least a part of the stopper portion decreases along the axis of the shaft-shaped portion in the axial direction toward the nozzle hole, so that the stopper inclined surface is contactable with the movable core at a contact portion, an axial clearance being formed between the stopper inclined surface and the movable core radially outward of the contact portion; and a resilient member that is disposed in the housing to press the stopper portion of the valve member toward the nozzle hole, wherein the resilient member is a first resilient member that presses the stopper inclined surface a against the movable core.