Abstract: An ultrasonic motor which has a viration mode of progressive wave with a large vibrational amplitude of an elastic member and which provides a high torque, comprises: at least one vibrator including a disk-shaped elastic member having a driving force transmitting portion, disk-shaped piezoelectric ceramics attached to both surfaces of the elastic member and a plurality of projections provided on both sides of the driving force transmitting portion; and at least one rotor that is in press contact with the driving force transmitting portion of the vibrator. The thickness of the elastic member at a portion between the piezoelectric ceramics is substantially equal to the thickness thereof at the driving force transmitting portion.

Abstract: A method and device for detection of knocking in an internal combustion engine which can not only detect knocking but also an abnormal condition of a cooling liquid in a liquid cooled engine. The device detects the vibration or pressure fluctuations of the cooling liquid generated by both knocking and the operating of the coolant pump.

Abstract: A knocking detecting device for an internal combustion engine including: a casing in the form of an annular member fastened substantially perpendicularly to an outer sidewall of the engine block; a support member made of a vibration-isolating material such as rubber or synthetic resin, and having one end fastened to the casing and the other end projecting a predetermined distance from the outer sidewall of the engine block to a position within a water chamber or a coolant water passage; a pressure-sensitive member including pressure-sensitive surfaces mounted on the projecting end of the support member, facing away from each other and extending perpendicularly to the outer sidewall of the engine block, for detecting as a change in an electrical signal pressure vibrations transmitted as a knocking sound to the pressure-sensitive surfaces through coolant water from the partition when knocking is produced in the combustion chamber; and lead wires for delivering the electrical signal change responsive to the knoc

Abstract: An electrical circuit for driving a piezoelectric transducer includes a DC electric source, a constant current circuit, connected to the DC electric source for processing a DC signal from the DC electric source and supplying a constant output current having a predetermined constant value, and an oscillation circuit connected to the constant current circuit for driving the piezoelectric transducer with a resonance frequency and with a constant current. The electrical circuit approximately drives the piezoelectric transducer with a constant current by supplying the constant current to the oscillation circuit.

Abstract: A device for inspecting spot welds which comprises a probe for receiving a reflected wave from an inspection material, a weld state display unit for displaying a waveform, a pulse interval and a number of pulses of the reflected wave, and a wave guide connected to an end portion of the probe, for guiding the reflected wave from the inspection material to the probe. The wave guide has an ultrasonic wave propagating section in the form of a cylinder and an internal ultrasonic wave absorbing section obtained by filling an inside hole of the cylinder with an ultrasonic wave absorbing material, the ultrasonic wave propagating section being so dimensioned that the length of an ultrasonic wave propagating path is within the range calculated from the following equation:L=n.lambda..+-.0.2.lambda.where n is an integer value, .lambda. is the wavelength (mm) of an ultrasonic wave, and L is the length (mm) of the ultrasonic wave propagating path.

Abstract: An ultrasonic transducer comprising a first cylindrical member which includes a mechanical vibration amplifying part formed in symmetry around the axis thereof and having a gradually increased cross-sectional area toward a base portion thereof, the base portion having a flat surface perpendicular to the axis thereof, and an annular rigid part formed with the mechanical vibration amplifying part coaxially therewith, the annular rigid part being extended from the outer wall of the base portion axially and radially outwardly to have sufficient rigidity and weight, and the annular rigid part being provided, in the proximity of the outer wall of the base portion, with an annular groove or gap having a predetermined axial depth in order to reduce the diameter of the flat surface.

Abstract: An ultrasonic wave carburetor includes an intake passage for admitting fresh air and supplying an air-fuel mixture therethrough, and a fuel supply device including a fuel reservoir, a venturi, and a nozzle one end of which is open into the venturi and the other end of which is communicated with the fuel reservoir. A fuel atomizing device, including an ultrasonic transducer connected to an ultrasonic wave oscillator for transforming an electrical oscillation into a mechanical vibration, a mechanical vibration amplifying member secured to the ultrasonic transducer for amplifying the mechanical vibration, and an ultrasonic vibratory member, having a hollow cylindrical body structure, secured to the amplifying portion, is positioned downstream of the venturi. With this structure, fuel supplied through the nozzle in the fuel supplying device is atomized on the peripheral surfaces of the ultrasonic vibratory member.

Abstract: 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.

Abstract: An ultrasonic wave generator includes an ultrasonic oscillator, an ultrasonic wave transducer connected to the oscillator, a mechanical vibration amplifying member, and an ultrasonic vibratory member. An increased thickness portion, which projects from a portion of the circumferential surface of the ultrasonic vibratory member and from a side wall portion of the mechanical vibration amplifying member at a connecting portion of the ultrasonic vibratory member and the mechanical vibration amplifying member, is integrally formed upon the ultrasonic vibratory member and the mechanical vibration amplifying member whereby the cross-sectional area of the connecting portion between the ultrasonic vibratory member and mechanical vibration amplifying member is gradually changed.

Abstract: The ultrasonic wave generator incorporates an ultrasonic-frequency vibratory member of cylindrical shape from which ultrasonic waves are produced, and the vibratory member is securely connected of its outer cylindrical surface to the mechanical vibration output end of a metallic block amplifier member which in turn is connected to an ultrasonic electromechanical transducer of the piezoelectric type, etc. The cylindrically shaped vibratory member effects a motion of flexural vibrations in the radial direction throughout its extensive areas, producing large-amplitude ultrasonic waves.

Abstract: A liquid atomizing apparatus includes an ultrasonic wave transducer connected to an ultrasonic wave oscillator for transforming an electrical oscillation into a mechanical vibration, and a mechanical vibration amplifying member has one end thereof integrally secured to one end of the ultrasonic wave transducer for amplifying the amplitude of the mechanical vibrations transmitted from the ultrasonic wave transducer. An ultrasonic vibratory member of a hollow cylindrical body, which has a predetermined wall thickness, has a portion of its outer circumferential surface integrally secured to the other end of the mechanical vibration amplifying member and a liquid supply means connected to a liquid source for supplying a liquid of a given amount to the circumferential surface of the ultrasonic vibratory member is also provided, the liquid being supplied to the circumferential surface of the ultrasonic vibratory member being atomized upon such circumferential surface of the ultrasonic vibratory member.