Fuel injection valve
AssigneeDenso Corporation
InventorsShinsuke Yamamoto, Kouichi Mochizuki
Life of this patent
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Abstract
A fuel injection valve includes a valve body, a fixed core, a movable core, a holder, and a stopper. The movable core has an inner core that contacts the stopper, and an outer core press-fitted to an outer peripheral surface of the inner core. The outer core has, in a moving direction of the movable core, a press-fit region which is press-fitted to the outer peripheral surface of the inner core, and a non-press-fit region which is not press-fitted to the outer peripheral surface of the inner core and is adjacent to the press-fit region in the moving direction. Between the inner peripheral surface of the holder and the outer peripheral surface of the movable core, the smallest gap in the press-fit region is larger than the smallest gap in the non-press-fit region.
Claims6
A fuel injection valve comprising:
- a valve body that opens and closes a nozzle hole for injecting a fuel;
- a fixed core that generates a magnetic attraction force upon energization of a coil;
- a movable core that has a cylindrical shape and opens the nozzle hole by moving together with the valve body by the magnetic attraction force;
- a holder that has a movable chamber filled with the fuel, and accommodates the movable core movable in the movable chamber;
- and
- a stopper that contacts the movable core to restrict movement of the movable core in a direction away from the nozzle hole, wherein
- the movable core includes an inner core that contacts the stopper, and an outer core that is press-fitted to an outer peripheral surface of the inner core,
- the outer core includes, in a moving direction of the movable core, a press-fit region in which the outer core is press-fitted to the outer peripheral surface of the inner core, and a non-press-fit region in which the outer core is not press-fitted to the outer peripheral surface of the inner core, the non-press-fit region being next to the press-fit region in the moving direction,
- between an inner peripheral surface of the holder and an outer peripheral surface of the movable core, a smallest gap in the press-fit region is larger than a smallest gap in the non-press-fit region, and
- a minimum inner diameter of a press-fit facing portion which is a portion of the holder facing an outer peripheral surface of the outer core in the press-fit region is larger than a minimum inner diameter of a non-press-fit facing portion which is a portion of the inner peripheral surface of the holder facing an outer peripheral surface of the outer core in the non-press-fit region.
Dependencies are inferred from the claim text.