Patent ID: 9605634
Date: 2017-03-28
CPC Classifications: F02M

Claim:
1. A fuel injection valve comprising: a cylindrical housing having an injection port formed at one axial end of the housing for injecting fuel, a valve seat formed adjacent to the injection port, and a fuel passage for passing the fuel to the injection port; a needle movably accommodated in the housing so as to reciprocate in an axial direction thereof, the needle having a shaft portion of a cylindrical rod shape, the needle having a sealing portion at one axial end of the shaft portion on a side to the valve seat, the needle having a large-diameter portion at the other axial end of the shaft portion on an opposite side to the valve seat, the large-diameter portion being integrally formed with the needle so that the large-diameter portion and the needle are movable as one unit, the large-diameter portion having an outer diameter larger than that of the shaft portion, the needle having a needle-side tapered surface inclined by a needle angle with respect to a center axis of the needle, the needle-side tapered surface being formed at an axial-side surface of the large-diameter portion on a side of a valve closing direction, the injection port being opened or closed when the sealing portion is separated from or seated on the valve seat; a solenoid coil for generating a magnetic field when electric power is supplied thereto; a fixed core fixed to an inside of the housing and arranged in a magnetic circuit generated by the solenoid coil; a movable core formed as a separate part from the needle and movably accommodated in the housing on a side of the fixed core to the valve seat, the movable core having a core-side tapered surface inclined by a core angle with respect to the center axis of the needle, the core-side tapered surface being brought into contact with the needle-side tapered surface, and the movable core reciprocating in the axial direction of the housing together with the needle; a first biasing member for biasing the needle in a valve closing direction; and a second biasing member for biasing the movable core in a valve opening direction, wherein the needle angle and the core angle are identical to each other, so that the needle side tapered surface and the core side tapered surface are in face to face contact with each other, and wherein the center axis of the needle is in the axial direction, such that the center axis of the needle is a center axis of the cylindrical rod shape of the shaft portion in the axial direction.