Abstract: An electronic horn for use, e.g., in a vehicle, includes a piezoelectric element (52) that excites a plate-shaped oscillator (51). A resonator (7) is provided with an opening (71) and covers forward of the oscillator such that a resonance space (S) is defined between the resonator and the oscillator. An inner cylinder (62) and an outer conical housing (63) are provided concentrically around the resonator. A circular cover (8) covers the inner cylinder (62) and the outer conical housing (63) from the front, such that a buffer chamber (BR), at least one first sound amplifying chamber (MH1), and a second sound amplifying chamber (MH2) are defined around an entire circumference of the opening of the resonator.

Abstract: An electronic horn includes a cover (8) on a front side of an intermediate element (6). A first passage (P1) within the horn is defined by a central portion (82) of the cover (8) that projects into a cylindrical interior of a cylindrical water-proofing wall (621). Second passages (P2, P3, P4) extend generally concentrically with respect to the first passage (P1) and are respectively defined by water-proofing walls (83, 84) that are formed on the cover (8) and project into the interior spaces of water-proofing walls (622, 633). The outermost second passage (P4) opens toward the forward direction. The first and second passages (P1-P4) extend in a back-and-forth path that prevents any rainwater, which has entered the interior of the horn through the opening of the outermost second passage (P4), from reaching a resonance space (7) defined between the resonator (7) and a sound-generating oscillator (51).

Abstract: An electronic horn for use, e.g., in a vehicle, includes a piezoelectric element (52) that excites a plate-shaped oscillator (51). A resonator (7) is provided with an opening (71) and covers forward of the oscillator such that a resonance space (S) is defined between the resonator and the oscillator. An inner cylinder (62) and an outer conical housing (63) are provided concentrically around the resonator. A circular cover (8) covers the inner cylinder (62) and the outer conical housing (63) from the front, such that a buffer chamber (BR), at least one first sound amplifying chamber (MH1), and a second sound amplifying chamber (MH2) are defined around an entire circumference of the opening of the resonator.

Abstract: An air supplying apparatus comprises, an air intake channel, one end of which is opened to the atmosphere, the other end of which is connected to a cylinder and in which an air stream flowing toward the cylinder is provided, a throttle valve provided in the other end side portion of the air intake channel, movable between a first position where the throttle valve sets the cross-sectional area of the air stream minimum and a second position where the throttle valve sets the same maximum, thereby controlling the output power of the engine, a control valve provided in one end side portion of the first channel, movable between a third position where the control valve closes the air intake channel and a fourth position where the control valve opens the air intake channel, a control channel attached to the air intake channel to by-pass the control valve, a supercharger provided in the control channel, a link mechanism connecting the throttle valve to the control valve, to move the control valve from the fourth posi

Abstract: An apparatus for controlling pressurized air supply to an engine has an intake passage connected to the engine at the downstream end thereof. A throttle valve is disposed at a downstream side of the intake passage. A supercharger control valve is disposed at an upstream side of the throttle valve in the intake passage. A supercharger passage containing a supercharger is connected to the intake passage at both upstream and downstream sides of the supercharger control valve. An actuator has an actuating body for dividing the actuator into a first and second pressure chambers. The actuating body is operatively connected to the supercharger control valve to close and open it according to the movement of the actuating body. A compression coil spring is provided in the first pressure chamber for normally pressing the actuating body to open the supercharger control valve.

Abstract: An atmospheric pressure compensation device has a reed valve of a resiliently bendable sheet material extending over a flat valve seat which defines therein an opening leading to an air passage to be connected to an air bleed of a carburetor, for example. The angular position of the freely bendable end portion of the reed valve relative to the valve seat is varied by a bellows member which is expansible and contractible in response to variation in the atmospheric pressure, to thereby control the rate of air flow through the opening and the passage to the air bleed. A fulcrum member is disposed in engagement with the reed valve to urge the same against the valve seat. The point of engagement of the fulcrum member with the reed valve is variable along the length thereof to vary the freely bendable length of the reed valve.