| 摘要 |
A fuel injector device in which the fuel flow path through the device includes a variable area metering orifice, the area of the orifice being adjusted in response to changes in fuel pressure at the injector device inlet. The orifice is formed by cooperation between one valve member and a fuel port in another valve member. The valve members are movable relative to each other and the fuel port extends in the direction of the relative movement and has a cross-sectional area which varies in that direction. A pressure-responsive member, for example a resilient diaphragm, senses the fuel pressure at the injector device inlet and causes relative movement between the valve members in response to changes in that pressure, to vary the area of the metering orifice. The fuel port may have a triangular cross-section, with both the base and height of the triangle increasing together along the fuel port in the direction of relative movement, whereby changes in the area of the metering orifice bear a "square law" relationship to changes in the inlet fuel pressure of the injector device.
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