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An ultrasonic wave fuel injection and supply device includes an ultrasonic wave generating device and a fuel injection nozzle device. The ultrasonic wave generating device in turn includes an ultrasonic transformer, for transforming electrical oscillations into mechanical vibrations, connected to an

An ultrasonic wave fuel injection and supply device includes an ultrasonic wave generating device and a fuel injection nozzle device. The ultrasonic wave generating device in turn includes an ultrasonic transformer, for transforming electrical oscillations into mechanical vibrations, connected to an ultrasonic oscillator, a mechanical vibration amplifier, for amplifying the amplitude of the mechanical vibrations, secured to the ultrasonic transformer, and a vibratory member, having a hollow cylindrically shaped body the peripheral wall of which is secured to the tip of the mechanical vibration amplifier with the axis of the vibratory member being disposed substantially perpendicular to the longitudinal axis of the mechanical vibration amplifier. The vibratory member has its opposite ends open and is disposed within an intake passage of an engine, the same therefore not hindering the flow of fluid through the intake passage. The fuel injection nozzle has its nozzle opening directed toward the peripheral wall of the vibratory member for injecting liquid fuel under pressure onto the peripheral wall. A fuel supply device introduces liquid fuel from a fuel reservoir to the injection nozzle, and a control device controls the amount of fuel being injected through the injection nozzle in response to the running conditions of the internal combustion engine. The ultrasonic wave fuel injection and supply device thus atomizes and scatters the liquid fuel injected onto the peripheral wall of the vibratory member as a result of the ultrasonic vibrations thereof, and the atomized and scattered liquid fuel is supplied to the combustion chamber of an engine, together with air from an air cleaner.

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