JP2010181599A - Electric horn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric horn capable of suppressing the deterioration of an amplification function caused by the retention of a water drop. <P>SOLUTION: In the electric horn 1 including a horn housing 10 and a vibration member 11 for generating a sound wave, and a spiral resonance tube 25 which are fixed to the horn housing, a part of wettability member 26 which has wettability is arranged at a part which is a recess facing upward in a vertical upper direction in a wall face 25a for dividing the sound path 25b of the spiral resonance tube 25, and the other part of the wettability member 26 is arranged outside the resonance tube 25 or near the sound wave output part 25d of the resonance tube 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric horn (sound alarm) for a vehicle. In particular, the present invention relates to an electric horn provided with a spiral resonance tube.

  The electric horn oscillates air with a diaphragm that vibrates due to electromagnetic force to create a sparse wave (sound wave), and amplifies it with a resonance tube and emits it. That is, the air vibration generated by the diaphragm is transmitted to the outside of the electric horn through the air passage (sound path) inside the resonance tube.

  In the case of an electric horn for a vehicle, rain water, splashes during traveling, or water during car washing may enter the resonance tube from the sound wave outlet of the resonance tube. When these water droplets enter the inside of the resonance tube, the sound pressure or the like changes, and there may be a problem that the sound is temporarily reduced.

  Then, the electric horn which can prevent the approach of a water droplet was developed (for example, refer patent document 1). The horn has a configuration in which a plate-like cap having the same size as the opening is covered at a sound wave outlet of a resonance tube with a predetermined interval.

Japanese Utility Model Publication No. 5-71045

  In the above-described conventional electric horn, a plate-shaped cap is covered, so that the ingress of water droplets can be considerably prevented, but the sound wave is emitted because it is emitted through the gap between the cap and the sound wave outlet of the resonance tube. There was a problem that the sound pressure of the sound wave was lowered.

  In addition, water droplets that have entered through the gap between the cap and the sound wave outlet of the resonance tube stay in the resonance tube, impairing the amplification function of the resonance tube and degrading the performance of the electric horn. It was.

  This invention is made | formed in view of such a situation, and makes it a subject to provide the electric horn which can suppress the fall of a sound pressure and can suppress the fall of the amplification function by retention of a water droplet.

  The electric horn of the present invention made to solve the above problems has wettability in an electric horn including a horn housing, a vibration member that generates sound waves fixed to the horn housing, and a spiral resonance tube. A part of the wettability member is disposed in a portion of the wall surface defining the sound path of the spiral resonance tube that is concave upward in the vertical direction, and the other part of the wettability member is disposed on the resonance tube. It is arranged outside or in the vicinity of the sound wave outlet of the resonance tube.

  Further, in the electric horn, the part where the wettability member is arranged may be the lowest part in the vertical direction of the concave part.

  Further, in the electric horn, the wettability member may be a member that oozes water remaining in the part from the part where the part is disposed to the one end part by capillary action.

  In the electric horn, the wettability member may be an elongated member, and a part of the wall surface that is concave upward in the vertical direction or a part disposed at the lowest part of the part may be one end.

  In the electric horn, the wettability member may be disposed in contact with the horn housing.

  In the electric horn, the wettability member may be disposed in contact with the wall surface along the sound path.

  A part of the wettability member having wettability is disposed in a portion that is concave upward in the vertical direction among the wall surfaces that define the sound path of the spiral resonance tube, and the other part of the wettability member is Since it is arranged outside the resonance tube or in the vicinity of the sound wave outlet of the resonance tube, water staying in a portion where the wall surface of the resonance tube is recessed upward is discharged outside the resonance tube through a wettable member. . As a result, a decrease in the amplification function of the resonance tube due to water retention is suppressed. In addition, since there is no cap at the sound wave outlet of the resonance tube, a decrease in sound pressure is also suppressed.

  If the part where the part of the wettability member is arranged is the lowermost part in the vertical direction of the concave part, the remaining water can be discharged to the last drop.

  If the wettability member is a member that oozes out the water staying in the part from the part where the part is arranged to one end by capillary action, the staying water can be efficiently discharged even if the cross-sectional area is small. it can. As a result, the amplification function of the resonance tube is not impaired.

  If the wettability member is an elongated member and the wall surface is recessed upward in the vertical direction, or a part disposed at the lowermost part of the portion is one end portion, the wall surface stays in the recessed portion Water that drains is quickly drained out of the resonance tube.

  When the wettability member is disposed so as to be in contact with the housing, the deterioration of the amplification function of the resonance tube by the wettability member is further suppressed.

  When the wettability member is disposed in contact with the wall surface along the sound path, a decrease in the amplification function of the resonance tube by the wettability member is minimized.

1 is a front view of an electric horn 1 according to the present invention. It is the sectional view on the AA line of FIG. It is a front view of the electric horn 1 of a deformation | transformation aspect. It is a front view of the electric horn 1 of another modification.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of an electric horn 1 according to the present invention attached to a front grill of a vehicle. 2 is a cross-sectional view taken along line AA in FIG.

  Reference numeral 10 denotes a horn housing, which includes a base housing 10a and a front cover 10b. The base housing 10a accommodates an electromagnet 12, a fixed iron core 21, and others that vibrate the plate-like vibrating member 11.

  A stay 22 for fixing to a vehicle (not shown) is fixed to the base housing 10a.

  The electromagnet 12 is provided with a coil 14 wound around a bobbin 13, and the right part of the movable iron core 15 is disposed in the center hole of the bobbin 13. The central part of the vibration member 11 is fixed to the left part of the movable iron core 15 by caulking. The outer peripheral end of the vibration member 11 is fastened and fixed to the outer peripheral end of the base housing 10a.

  The outer peripheral end of the front cover 10b is fastened and fixed so as to overlap the outer peripheral end of the base housing 10a from above the outer peripheral end of the vibration member 11. An opening 10c is provided at the center of the front cover 10b.

  The spiral resonance tube 25 includes a wall surface 25a that partitions a sound path 25b that amplifies a dense wave (sound wave) of air generated by the vibration of the vibration member 11, and is fixed to the front cover 10b. The sound path 25b has a substantially rectangular cross section, and one side (the right side in FIG. 2) of the rectangular cross section is constituted by the front cover 10b.

  The resonance tube 25 has an inlet portion 25c into which the sound wave of the vibration member 11 is incident at the central portion, and a sound wave outlet portion 25d at the lower end portion. The sound path 25b is partitioned in a spiral shape by a wall surface 25a with the entrance 25c as the center.

  The elongate wettability member 26 has the other end portion disposed in a portion of the wall surface 25a of the resonance tube 25 that is concave upward in the vertical direction, and one end portion is disposed in the vicinity of the sound wave outlet portion 25d of the resonance tube 25. .

  The wettability member 26 is a member that sucks up water by a capillary phenomenon, and is, for example, a fibrous material such as gauze or silk thread. The vicinity of the upper end of the wettability member 26 is sandwiched and fixed between the side end of the wall surface 25a and the upper surface of the front cover 10b, and the intermediate part of the wettability member 26 is disposed in contact with the front cover 10b.

  Since the structure is as described above, the sound wave (air vibration) transmitted from the opening 10c of the front cover 10b is amplified while propagating through the sound path 25b of the resonance tube 25, and then outward from the sound wave outlet 25d. Is emitted.

  For example, most of the water that has entered from the sound wave outlet 25d during rainy weather stays in a portion (i.e., staying water W) where the wall surface 25a that finally defines the sound path is recessed upward in the vertical direction (residual water W). Alternatively, it is removed by the capillary action of the wettability member 26 after raining.

  Since the wettability member 26 is arranged along the inner wall of the sound path 25b, the amplification function of the resonance tube 25 is hardly deteriorated.

  In the electric horn 1 of the present embodiment, a fibrous material such as gauze or silk thread is used for the wettable member 26, but a fine foam foam or a straw or a capillary tube may be used.

  Further, in the electric horn 1 of the present embodiment, the water that has entered deeply from the outlet 25d flows into the base housing 10a from the opening 10c of the base housing 10a, but the amount of the water is small, and the electric horn There is almost no decrease in performance.

  In order to completely prevent the water from flowing into the base housing 10a, for example, a waterproof wall indicated by a dotted line so that the water stays in the portion B where the wall surface 25a defining the sound path is recessed upward in the vertical direction. 25e may be formed, and the wettability member 26 may be extended to the part (see FIG. 2).

  Further, as shown in FIG. 3, the end portion of the wettability member 26 is preferably positioned at the lowermost portion C of the portion where the wall surface 25a is concave upward in the vertical direction, and the other end portion is projected out of the resonance tube as short as possible. By doing so, the staying water can be discharged quickly to the last drop.

  Further, as shown in FIG. 4, the other end portion may be suspended in the vertical direction along the wall surface 25a without bringing the wettability member 26 out of the resonance tube in the shortest time. By carrying out like this, the water which a water | moisture content evaporates from a sag part can be discharged | emitted efficiently. Since the wettability member 26 is not visible from the outside, the design of the electric horn is not impaired.

DESCRIPTION OF SYMBOLS 1 ... Electric horn 10 .... Horn housing 10b ... Front cover 11 ... Vibration member 25 ... Spiral resonance tube 25a ...・ ・ Wall 25b ・ ・ ・ Sound passage 25d ・ ・ ・ Sound wave outlet 26 ・ ・ ・ ・ ・ ・ Wetting material

Claims (6)

In an electric horn comprising a horn housing, a vibrating member that generates sound waves fixed to the horn housing, and a spiral resonance tube,
A part of the wettability member having wettability is disposed in a portion that is concave upward in the vertical direction among the wall surfaces that define the sound path of the spiral resonance tube, and the other part of the wettability member is An electric horn arranged outside the resonance tube or in the vicinity of a sound wave outlet of the resonance tube.   2. The electric horn according to claim 1, wherein a part where the part of the wettability member is disposed is a lowermost part in a vertical direction of the concave part.   3. The electric horn according to claim 1, wherein the wettability member is a member that oozes water remaining in the part from the part where the part is disposed to the one end part by capillary action.   The wettability member is an elongated member, and a part of the wall surface that is concave upward in the vertical direction or a part disposed at the lowermost part of the part is one end. The described electric horn.   The electric horn according to any one of claims 1 to 4, wherein the wettability member is disposed in contact with the horn housing.   The electric horn according to any one of claims 1 to 4, wherein the wettability member is disposed in contact with the wall surface along the sound path.

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