JP5132421B2 - Vehicle horn - Google Patents

Description

  The present invention relates to a vehicle horn, and more particularly to a so-called trumpet type vehicle horn.

As an example of vehicle safety parts such as automobiles and motorcycles, an alarm device (so-called vehicle horn) can be cited. The vehicle horn is mainly in the form of generating a vibration wave serving as an alarm sound outside the main body by operating a diaphragm which is a sound source by electricity from a battery mounted on the vehicle. In such a vehicle horn, a so-called trumpet type vehicle horn is disclosed in Patent Document 1, for example.
JP 2008-89627 A

  The trumpet type vehicle horn disclosed in Patent Document 1 is provided with a reflector for horizontally reflecting the vibration wave (sound) emitted to the external space from the sound emitting portion that opens toward the ground surface. This reflector is provided with a through-hole to prevent foreign matter flying from the sound-reflecting side (the front side of the vehicle horn) from entering the main body from the sound emitting part. It has been. The vehicle horn formed in this way can pass foreign matter flying from the side where the sound is reflected through the through hole between the sound emitting portion and the reflecting plate, and the foreign matter can pass from the sound emitting portion to the inside of the main body portion. It is said that it can prevent entering.

In such a vehicle horn with a reflector, if the gap between the opening end face of the sound emitting part and the reflector is large, foreign matter may enter the main body from this gap, and the vehicle horn may be damaged. There is a problem such as.
On the other hand, when the gap between the opening end face of the sound emitting part and the reflector becomes small, the propagation path of the vibration wave becomes between the sound emitting part and the reflector, and the vibration wave propagated from the sound source There is also a problem that the main body which is also a resonance body does not resonate as designed, and the vehicle horn cannot provide the designed tone and sound volume (sound pressure).

  Accordingly, the present invention provides a vehicle horn that can reliably prevent entry of foreign matter from the sound emitting portion and can provide the designed tone and volume even when having a reflector. The purpose is to provide.

  The present invention relates to a sound source, a main body portion formed with a sound path for guiding a vibration wave generated by the sound source to a sound emitting portion via a spiral path, and an opening end face of the sound emitting portion opened toward the ground surface. A reflection plate disposed at a position away from the reflection plate for reflecting the vibration wave propagating through the sound path in a horizontal direction, and a foreign object formed in a lattice shape between the opening end surface of the sound emitting unit and the reflection plate An intrusion prevention unit, wherein the sound path is designed such that a path length from the diaphragm to the reflector is a path length that generates a natural vibration. is there.

  Further, the foreign matter intrusion prevention portion is formed over the entire circumference of the planar outer peripheral edge of the reflector. Thereby, invasion of foreign matters can be prevented more reliably.

  Further, the lattice-like portion of the foreign matter intrusion preventing portion is provided so that the opening area on the back side is equal to or larger than the opening area on the front side. As a result, even if the sound emitting part faces the vehicle traveling direction, the foreign matter passes through the horn through the lattice portion, so that foreign matters such as rain and pebbles do not enter the inside of the vehicle horn. It is.

  According to the vehicle horn according to the present invention, it is possible to reliably prevent the entry of foreign matter from the sound emitting portion and to design the sound path based on the path length from the sound source to the reflector. It is possible to provide a vehicle horn that can emit street tone and volume.

  Hereinafter, an embodiment of a vehicle horn according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a vehicle horn in the present embodiment. FIG. 2 is a front perspective view showing a state before joining of the vehicle horn. FIG. 3 is a rear perspective view showing a state before joining of the vehicle horn. FIG. 4 is a cross-sectional view taken along the line AA in FIG. FIG. 5 is a cross-sectional view taken along line BB in FIG.

  As shown in each of FIGS. 1 to 5, the vehicle horn 10 (hereinafter simply referred to as the horn 10) in the present embodiment includes a sound path 20 (20 </ b> A, 20 </ b> B, 20 </ b> C in FIG. 4) formed in a spiral path. 20D, 20E) and a vibration plate 30 that is a sound source that supplies a vibration wave to the starting position of the sound path 20, and a body portion 40 that is integrally formed with the body portion 40 and propagates through the sound path 20. Sound emitting unit 70 that emits the generated vibration wave to the external space, reflection plate 80 that reflects the vibration wave emitted from sound emission unit 70 in the traveling direction of the vehicle (that is, in the horizontal direction), sound emission unit 70 and reflection plate And a foreign matter intrusion prevention portion 90 for preventing foreign matter from entering the inside of the main body portion 40 from a gap portion between the sound emitting portion 70 and the reflection plate 80. The vehicle horn 10 is mounted on a vehicle (not shown) by a mounting plate 12 mounted on the back side of the main body 40.

  As clearly shown in FIGS. 2 and 3, the main body portion 40 of the horn 10 in the present embodiment is provided with a diaphragm accommodating portion 51 for accommodating the diaphragm 30 and vibration waves from the diaphragm 30. A communication hole 54 that propagates to the sound path 20 and a lattice member 92 that is a part of the foreign matter intrusion prevention unit 90 are integrally formed, and a vibration wave generated by the diaphragm 30 is connected to the communication hole. 54 is disposed in a spiral shape so as to propagate through 54, reflect in a direction orthogonal to the vibration direction of the diaphragm 30, and circulate around the central axis 32 of the diaphragm 30 (perpendicular to the plane center of the diaphragm 30). Of the spiral wall portion 62, the side wall 63 erected on the outer periphery of the spiral wall portion 62, the sound emitting portion 70 for emitting the vibration wave in the vertical direction to the external space, and the foreign matter intrusion prevention portion 90 The second member 60 formed integrally with the lattice body 94 which is a part. And it is made of.

As shown in FIG. 3, the diaphragm accommodating portion 51 that accommodates the diaphragm 30 as a sound source is formed by a partition wall 52 of the first member 50 and a side wall 53 erected along the outer peripheral edge of the partition wall 52. Yes. A communication hole 54 that communicates between the diaphragm housing portion 51 and the spiral wall portion 62 formed in the second member 60 is formed at a substantially central portion on the front side of the partition wall 52. In the present embodiment, the center position of the communication hole 54 is matched with the position of the center axis 32 of the diaphragm 30.
Further, two horizontal plates 92A are arranged in parallel to each other below the first member 50, and a lattice body 92 is formed by connecting the upper and lower horizontal plates 92A with a connecting member 92B which is a vertical member. Yes. The shape of the lattice body 92 is not particularly limited, but the number of horizontal plates 91A and connecting members 92B can be adjusted as necessary.

  As shown in FIGS. 2 and 3, the second member 60 is formed with a partition wall 61 for holding a spiral wall portion 62 and a side wall 63 along the outer peripheral edge of the partition wall 61. A sound emitting portion 70 is provided on the surface of the partition wall 61 opposite to the standing direction of the side wall 63. The sound emitting unit 70 gradually separates the vibration wave propagating through the spiral wall portion 62 of the second member 60 from the surface of the partition wall 61 with the outermost peripheral portion of the spiral wall portion 62 as a starting point. It is formed so that it can be released to the external space while gradually widening the vibration wave by gradually increasing the cross-sectional area of the space in which it propagates. In the present embodiment, as shown in FIGS. 1 and 2, the opening end surface of the sound emitting unit 70 is formed in a state of facing the ground surface.

A reflector 80 is disposed below the opening end surface of the sound emitting unit 70. The reflecting plate 80 is disposed in parallel with the opening end surface of the sound emitting unit 70, and is formed so that the planar region of the reflecting plate 80 is wider than the planar region of the opening end surface of the sound emitting unit 70. (See FIGS. 4 and 5).
Further, in a gap portion between the opening end surface of the sound emitting unit 70 and the reflection plate 80, a lattice body including a plurality of horizontal plates 94A and a connecting member 94B that is a vertical member that connects the horizontal plates 94A adjacent vertically. 94 is disposed. The outer edge position of the horizontal plate 94 </ b> A is formed in a state where the outer edge position protrudes outward from the outer peripheral edge position of the opening end surface of the sound emitting unit 70.

  As shown in FIGS. 2 to 5, the horizontal plate 94 </ b> A of the lattice body 94 formed on the second member 60, with respect to the outer peripheral edge of the opening end surface of the sound emitting unit 70 as it moves away from the opening end surface of the sound emitting unit 70. Although the amount of protrusion gradually decreases, the outer peripheral edge position of the horizontal plate 94 </ b> A does not become inside the outer peripheral edge of the opening end surface of the sound emitting unit 70. Of course, the grid 94 is not limited to the number of the horizontal plates 94A and the connecting members 94B shown in the figure.

  In the first member 50 and the second member 60 described above, the spiral wall portion 62 of the second member 60 faces the surface of the side partition wall 52 where the diaphragm accommodating portion 51 of the first member 50 is not formed. The main body portion 40 is formed by integrating the contact portions by ultrasonic bonding. The partition wall 52 of the first member 50 is formed so that the portion with which the spiral wall portion 62 abuts is slightly thicker than the other portions, so that the adhesiveness when ultrasonic bonding is good. .

  By integrally molding the first member 50 and the second member 60, the lattice bodies 92 and 94 formed in each are assembled to form the foreign matter intrusion prevention unit 90. The lattice bodies 92 and 94 are respectively formed with frame portions 93 and 95, and the frame portions 93 and 95 come into contact with each other and are ultrasonically joined to assemble the frame bodies 92 and 94 together. . The lattice-shaped foreign matter intrusion prevention unit 90 in the present embodiment is formed over the entire circumference of the outer peripheral edge in the planar region of the reflector plate 80. Further, the foreign matter intrusion prevention unit 90 in the present embodiment is such that the opening area between the lattices of the lattice body 92 on the rear surface side (back side) is equal to or larger than the opening area between the lattices on the lattice body 94 on the front surface side (front side). Is provided. Further, when the foreign matter intrusion prevention unit 90 is viewed from the front, the arrangement position of the connecting member 92B, which is the vertical member of the grid-like body 92 on the back side, is the connection position of the vertical member of the grid-like body 94 on the front side. It is formed so as to coincide with one of the arrangement positions of the material 94B.

  In the main body 40 assembled in this manner, the partition 52 and the communication hole 54 of the first member 50, and the partition 61, the spiral wall 62, and the sidewall 63 of the second member 60 are spiral paths. The sound path 20 is formed. For each of the first member 50 and the second member 60, various members constituting the sound path 20 and the foreign matter intrusion prevention unit 90, and the sound emitting unit 70 are built in advance, thereby creating a complicated internal structure. Even the horn 10 having this configuration is advantageous because the assembly cost can be greatly reduced.

  As shown in FIGS. 4 and 5, a diaphragm 30 that vibrates with a supplied power source and generates a vibration wave is housed in the diaphragm housing 51 of the main body 40. The vibration wave generated by the diaphragm 30 passes through the communication hole 54, is reflected in the direction perpendicular to the vibration direction of the diaphragm 30 by the partition wall 61 of the second member 60, and then is a sound path formed in the spiral path. 20A, 20B, 20C, 20D, and 20E pass around the central axis 32 of the diaphragm 30, and the vibration wave gradually separates from the central axis 32 of the diaphragm 30 and the sound path 20 (main body 40). It propagates toward the outer peripheral side. The vibration wave that has reached the outermost peripheral position (20E) of the sound path 20 propagates to the sound emitting unit 70, moves away from the vibration surface of the diaphragm 30, and is directed to the ground surface after expanding in the sound emitting unit 70. It is discharged from the opening end face to the external space.

The horn 10 in the present embodiment emits a vibration wave emitted from the sound source (the diaphragm 30) from the sound emitting unit 70 to the external space, and then is orthogonal to the emission direction (a state in which the vibration wave is prevented from progressing). By reflecting toward the front side of the horn 10 by the reflecting plate 80 disposed in the above, it is possible to accurately emit the alarm sound toward the position where it is necessary.
In addition, since a foreign matter intrusion prevention unit 90 for preventing the invasion of foreign matters is formed between the reflecting plate 80 that reflects the vibration wave and the sound emitting portion 70, the inside of the horn 10 It is possible to reliably prevent foreign matter from entering the horn, and the horn 10 can be used in a good state for a long time.

  Further, in the vehicle horn 10 according to the present invention, the path from the position of the diaphragm 30 as the sound source to the reflector 80 is used as a design path length for suitably resonating the main body 40 that is also a resonator with vibration waves. Since the length is adopted, the main body 40 can be resonated as designed by the vibration wave. Thereby, the tone of the alarm sound after reflection (the alarm sound heard by the subject who has issued the alarm) is good, and the attenuation of the sound pressure can be minimized.

The applicant conducted an experiment in which the sound pressure was measured at a position 2 m away from the front of the vehicle horn 10 using the vehicle horn 10 containing the 500 Hz diaphragm 30. The measured sound pressure (basic measured sound pressure) of the horn without the reflector 80 is 110 dB (A), whereas the measured sound pressure of the horn equipped with the reflector 80 in the prior art is 107 dB (A). Met. In contrast, the measured sound pressure of the vehicle horn 10 in this embodiment was 109 dB (A).
According to the above experimental results, the measurement plan pressure of the horn equipped with the reflector 80 in the prior art is reduced by 3 dB (A) with respect to the basic measurement sound pressure, whereas the vehicle horn in the present embodiment. It is clear that the measured sound pressure of 10 is only reduced by 1 dB (A) from the basic measured sound pressure, and can provide a sound pressure comparable to a horn without the reflector 80 attached. became.

  Although the horn 10 in the present embodiment has been described in detail above, the horn 10 according to the present invention is not limited to the present embodiment. For example, in the above-described embodiment, the foreign matter intrusion prevention unit 90 has been described with respect to an embodiment in which the opening area in the lattice-like body 94 on the rear surface side is equal to or larger than the opening area in the lattice-like body 92 on the front surface side. An embodiment may be adopted in which the opening area of the side lattice-like body 92 is equal to the opening area of the front-side lattice-like body 94. In short, it is only necessary that foreign matters such as water and stones flying from the front during vehicle travel can be discharged from the opening on the back side without any delay when entering from the opening on the front side.

It is a front view of the horn for vehicles in this embodiment. It is a front perspective view which shows the state before the assembly of a main-body part. It is a back perspective view which shows the state before the assembly of a main-body part. It is sectional drawing in the AA line in FIG. FIG. 3 is a three-dimensional sectional view taken along line BB in FIG. 1.

Explanation of symbols

10 Vehicle Horn (Horn)
12 Mounting plate 20, 20A, 20B, 20C, 20D, 20E Sound path 30 Diaphragm 32 Center shaft 40 Main body part 50 First member 51 Diaphragm housing part 52 Partition 53 Side wall 54 Communication hole 60 Second member 61 Partition 62 Swirl Wall part 63 Side wall 70 Sound emitting part 80 Reflecting plate 90 Foreign matter intrusion preventing part 92, 94 Grid 92A, 94A Horizontal member 92B, 94B Connecting part 93, 95 Frame part

Claims (3)

Sound source,
A main body portion formed with a sound path for guiding the vibration wave generated by the sound source to the sound emitting portion through a spiral path;
A reflector that is disposed at a position away from the opening end face of the sound emitting part that is open toward the ground surface, and that reflects the vibration wave that has propagated through the sound path in a horizontal direction;
A foreign matter intrusion prevention portion formed in a lattice shape between the opening end surface of the sound emitting portion and the reflection plate,
The vehicle horn is characterized in that the sound path is designed such that a path length from the diaphragm to the reflector is a path length that generates a natural vibration.   2. The vehicle horn according to claim 1, wherein the foreign matter intrusion prevention unit is formed over the entire circumference of the outer peripheral edge of the reflecting plate.   3. The vehicle horn according to claim 1, wherein the lattice-shaped portion of the foreign matter intrusion prevention unit is provided so that an opening area on the back side is equal to or larger than an opening area on the front side.

Images