| 摘要 |
An injection valve comprising a hollow casing containing an electromagnetic winding connected to a source of electric pulses, an armature in the casing near the winding, a likewise hollow nozzle held by the casing so as to extend therein for a length defined by the geometrical requirements of the intake manifold so as suitably to position the fuel discharge aperture at the front end of the manifold, a closure means having a first end secured to the armature, an external surface coupled to the inner surface of the nozzle, to guide the travel of the closure means, and a second end comprising a conical part adapted to come in contact with a conical seat formed in the nozzle immediately upstream of a bore and bearing a fuel-atomizing deflector which co-operates with the bore in the nozzle to define the fuel discharge aperture, the conical part forming a seal when, under the action of a resilient force, it is in contact with the conical seat whereas it opens the discharge aperture under the action of the magnetic field so as to allow fuel to escape from the valve, the valve also comprising end-of-travel means adapted to limit the opening travel of the closure means, and a pipe system through which the fuel, after being sent to the valve under pressure by the supply device, travels from the inlet to a region upstream of the sealing seat and between the outer surface of the closure means and the inner surface of the nozzle; said pipe system, at the region upstream of the sealing seat, being formed with a number of bores 37, the axis of which has a considerable component parallel to the central longitudinal axis of the injector.
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