JP2014098741A - Horn for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent foreign matters from penetrating a body part of a horn for a vehicle to prevent the foreign matters from penetrating the depth of the horn even when washing the vehicle using high-pressure water or compressed air.SOLUTION: The horn for a vehicle includes: a diaphragm 30; a sound channel 20 which is formed into a spiral path being a propagation path for an oscillatory wave generated by the diaphragm 30; a sound emission part 70 which emits the oscillatory wave propagating in the sound channel 20 to the outside of a body part 40; and a covering reflection plate 80 which is arranged in a ground surface-side position separated from an opening end surface of the sound emission part 70 directed to the ground surface, covers a plane area of the opening end surface of the sound emission part 70 and reflects the oscillatory wave from the sound channel 20 to the outside of the body part 40. A trumpet-shaped front cover 62 forming a front side wall surface of the sound emission part 70 is formed in the body part 40, an overhang plate 63 is provided in the opening end surface of the sound emission part 70, and an edge part 66 projecting toward the covering reflection plate 80 is formed of a lower surface-side rear end part of the overhang plate 63 and an inner wall surface lower end part of the trumpet-shaped front cover 62.

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 2009-282235 A

The trumpet type vehicle horn disclosed in Patent Document 1 reflects the vibration wave (sound) emitted from the sound emitting part that opens toward the ground surface in the horizontal direction and prevents the intrusion of foreign matter. A plate-like member (reflecting plate) for prevention is provided. Since there is a gap between the sound emitting part and the reflecting plate, foreign matter flying from the side that reflected the sound through this gap (front side of the vehicle horn) is between the sound emitting part and the reflecting plate. A foreign matter intrusion prevention unit is provided for preventing entry into the interior space of the vehicle horn from the gap.
The vehicle horn formed in this way can prevent the entry of foreign matter flying from the side reflecting the sound, and can prevent the occurrence of a vehicle horn malfunction caused by the entry of foreign matter. Has been.

Even if the vehicle horn is equipped with such a foreign matter intrusion prevention unit, very fine sand or water may enter the interior space of the vehicle horn. As long as you have it, you can't avoid it. However, even if such foreign objects such as very fine sand enter the internal space of the vehicle horn body, it does not reach the sound path and stays in the vicinity of the opening end of the sound emission section. The operation of the vehicle horn is not adversely affected.
However, when a car wash using high-pressure water is performed with foreign matter remaining in the vicinity of the opening end of the sound emitting unit, the opening end of the sound emitting unit may depend on the injection angle of the high-pressure water to the vehicle. It has been clarified by experiments by the inventors that fine foreign matters staying in the vicinity of the portion may enter the inner side of the internal space of the vehicle horn body together with the high-pressure water. It has also been clarified that when compressed water is used to blow off the water on the surface of the vehicle after washing, the water together with the compressed air may enter the internal space of the vehicle horn body.

  Therefore, the present invention prevents foreign matter from entering the internal space of the main body of the vehicle horn as much as possible, and even when the vehicle is washed using high-pressure water or compressed air, An object of the present invention is to provide a vehicle horn in which water or foreign matter and compressed air do not enter the inner side of the internal space of the vehicle horn body.

  The present invention provides a sound source accommodated in a main body part, a sound path provided in the main body part and formed in a spiral path serving as a propagation path of a vibration wave generated by the sound source, and the sound path propagated through the sound path A sound emitting part that emits vibration waves to the outside of the main body part, and an opening end face of the sound emitting part that is disposed at a position on the ground surface side that is separated from an opening end face of the sound emitting part that opens toward the ground surface. And a covering reflector that reflects the vibration wave from the sound path to the outside of the main body, and the main body has a trumpet shape that serves as a wall surface on the front side of the sound emitting part. A front cover is formed, and an opening plate is provided on the opening end surface of the sound emitting portion. The protruding plate protrudes to a range outside the plane area of the opening end surface of the sound emitting portion. By the lower end of the lower surface side and the lower end of the inner wall surface of the trumpet-shaped front cover It is a vehicle horn, characterized in that the edge portion protruding in a direction in serial coated reflector is formed.

  Moreover, it is preferable that a foreign matter intrusion prevention portion is formed by a lateral rib and a longitudinal rib on the front portion of the main body portion between the opening end face of the sound emitting portion and the coated reflector. As a result, it is possible to more reliably prevent foreign matter from entering from the sound emitting unit.

  In addition, it is more preferable that the protruding plate, the foreign matter intrusion prevention unit, and the coated reflecting plate are integrally formed. According to this, the variation in the shape of the edge part in the vehicle horn can be suppressed, the quality of the vehicle horn can be made uniform, and the manufacturing cost of the vehicle horn can be reduced.

  According to the vehicle horn of the present invention, foreign matter can be prevented from entering the internal space of the main body as much as possible, and foreign matter can be removed even when car wash using high-pressure water or compressed air is performed. It is possible to provide a vehicle horn in which high-pressure water or foreign matter and compressed air do not enter the inner side of the interior space of the vehicle horn.

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 a front view of the horn for vehicles in this embodiment. It is sectional drawing in the AA line in FIG. It is sectional drawing in the BB line in FIG. It is sectional drawing in the CC line in FIG. It is the end elevation which expanded and displayed the opening end surface vicinity of the sound emission part among the main-body parts in the AA line in FIG. FIG. 4 is an end view taken along line BB in FIG. 3. It is sectional drawing in the ZZ line in FIG.

  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 perspective view showing a state before joining of a vehicle horn. FIG. 2 is a rear perspective view showing a state before joining of the vehicle horn. FIG. 3 is a front view of the vehicle horn in the present embodiment. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a cross-sectional view taken along line BB in FIG. 6 is a cross-sectional view taken along the line CC in FIG.

  As shown in each of FIGS. 1 to 6, the vehicle horn 10 in the present embodiment has a spiral path sound path 20 (20A, 20B, 20C, 20D, and 20E in FIG. 4) in the main body 40. At the starting point position of the sound path 20, a communication portion (through hole 54) with the diaphragm 30, which is a sound source that supplies vibration waves, is provided. The main body 40 is integrally formed with a trumpet-like sound emitting portion 70 that emits a vibration wave propagated through the sound path 20 to the external space. The most downstream part of the sound emission part 70 is formed in the opening end surface opened to the ground surface side. The lower side position of the opening end surface of the sound emitting unit 70 covers a plane area on the opening end surface of the sound emitting unit 70, and at least vibration waves emitted from the opening end surface of the sound emitting unit 70 to the outside of the main body 40 are detected in the vehicle. A coated reflector 80 that reflects in the traveling direction is disposed.

The coated reflector 80 is provided with a required interval from the opening end surface of the sound emitting unit 70, and the front portion and the side of the coated reflector 80 are disposed in the gap between the opening end surface of the sound emitting unit 70 and the coated reflector 80. A foreign matter intrusion prevention unit 90 for preventing foreign matter from entering the internal space of the main body 40 from the outside of the vehicle horn 10 is disposed on the side portion.
Such a vehicle horn 10 is mounted on a vehicle (not shown) using a mounting plate 12 attached to the rear side of the main body 40 by screwing or the like, and fasteners represented by bolts and nuts. Installed and used.

  As shown in FIGS. 1 and 2, the main body 40 of the vehicle horn 10 is formed by assembling the first member 50 and the second member 60 together. A partition wall 51 having a through hole 54 is formed in the first member 50, and a spiral wall portion 64 is formed in the second member 60. Therefore, when the main body portion 40 is formed, the main body portion is formed. The sound path 20 having a spiral path is simultaneously formed in the internal space 40. As a method of assembling the first member 50 and the second member 60, a known assembling method can be used as appropriate. In the present embodiment, an embodiment employing an assembling method by ultrasonic welding will be described.

As shown in FIG. 1 and FIG. 2, the first member 50 includes a diaphragm 51 that is a sound source, with a partition wall 51 formed in a disc shape and a side wall 52 erected along the outer peripheral edge of the partition wall 51. A diaphragm accommodating portion 53 for accommodating 30 is formed. A through hole 54 is formed in the central portion of the partition wall 51 for propagating the vibration wave generated by the diaphragm 30 from the diaphragm housing portion 53 to the sound path 20.
An extension wall portion 55 for forming a part of the rear side wall portion of the sound emitting portion 70 is formed at the lower rear position of the first member 50. Further, a crank wall portion 56 that extends rearward of the main body portion 40 and then bends in a direction approaching the shielding reflector 80 is disposed at a lower position of the side wall 52 on the opening end face side of the sound emitting portion 70. Yes. The rear side end portion of the crank wall portion 56 forms a part of the upper end edge of the opening portion 42 formed in the rear portion of the main body portion 40.

  Further, in the partition wall 51 of the first member 50, the portion adjacent to the position where the expansion wall portion 55 is disposed protrudes on the side opposite to the standing direction of the side wall 52 (the front side of the main body portion 40). A foreign matter intrusion prevention wall 57 is erected. The foreign matter intrusion prevention walls 57 are formed at a plurality of locations of the partition wall 51 at a necessary interval in the extending direction of the sound emitting portion 70 (the propagation direction of the vibration wave) in an arrangement crossing the sound emitting portion 70. The foreign matter intrusion prevention wall 57 is formed such that the height of the downstream side wall surface is higher than the height size of the upstream side wall surface in the vibration wave propagation direction. The protruding height from the partition wall 51 is formed on an inclined surface that gradually increases from the upstream side to the downstream side.

  By providing such a foreign matter intrusion prevention wall 57 in the sound emitting portion 70, it is possible to capture the foreign matter that has passed through the foreign matter intrusion preventing portion 90 in the sound emitting portion 70 (to prevent entry into the sound path 20). It is possible to prevent foreign matter from entering the sound path 20. The foreign object intrusion prevention wall 57 is formed so that the wall surface on the foreign object intrusion side is higher than the wall surface on the back side of the sound emitting part 70, and particularly when the foreign object intruding from the foreign object intrusion prevention unit 90 is water. This is convenient when the invading water is rebounded to the opening end face side of the sound emitting unit 70. In addition, since the protruding front end portion of the foreign matter intrusion prevention wall 57 is formed on an inclined surface, the vibration wave propagating from the sound path 20 is attenuated by the foreign matter intrusion prevention wall 57 in the sound emitting portion 70. It is also possible to suppress as much as possible.

  Further, the partition wall 51 of the first member 50 is provided with a welding resin portion 58 on the surface opposite to the standing surface of the side wall 52 (which is the front side of the main body portion 40). The welding resin portion 58 is melted by ultrasonic vibration applied when the first member 50 and the second member 60 are ultrasonically welded, and the melted resin portion 58 is melted by the first member 50 and the second member. 60 is used as an adhesive for adhering to 60. The welding resin portion 58 is disposed along a contact portion with a spiral wall portion 64 of the second member 60 described later.

As shown in FIG. 1, the second member 60 is integrally formed with a front cover 61 that forms the front surface of the main body 40 and a trumpet-shaped front cover 62. A trumpet-shaped front cover 62 that forms a part of the sound emitting portion 70 formed in a trumpet shape is provided in a state of protruding further to the front side than the front cover 61.
The sound emitting unit 70 is formed by the trumpet-shaped front cover 62 of the second member 60 and the partition wall 51 of the first member 50. The sound emitting section 70 gradually starts the vibration wave propagating through the sound path 20 (the spiral wall section 64) from the outermost periphery of the spiral wall section 64 to the front side. In addition to being separated, the cross-sectional area of the space in which the vibration wave propagates is gradually increased so that the vibration wave can be discharged outside the main body 40 while being widened.

In addition, at the lower end portion of the trumpet-shaped front cover 62 which is also the position of the opening end surface of the sound emitting portion 70, the pushing plate 63 is arranged in a trumpet shape so as to protrude to a range outside the plane region of the opening end surface of the sound emitting portion 70. It is formed integrally with the front cover 62. An edge portion 66 is formed by the rear surface rear end portion of the pushing plate 63 and the inner wall lower end portion of the trumpet-shaped front cover 62. The edge portion 66 is formed in a shape protruding toward the covering shielding plate 80 side.
In addition, a vertical rib 91 is integrally formed on the lower surface of the protruding plate 63, and the coated reflector 80 is spaced apart from the opening end surfaces of the protruding plate 63 and the sound emitting unit 70 by the vertical rib 91. Is retained. A horizontal rib 92 is integrally formed at an intermediate position in the height direction of the vertical rib 91. That is, the foreign matter intrusion prevention unit 90 including the vertical ribs 91 and the horizontal ribs 92 is formed between the projecting plate 63 provided at the opening end surface position of the sound emitting unit 70 and the covering reflection plate 80. Become.

  The coated reflector 80 is formed so that the shape of the outer periphery on the front side follows the shape of the outer periphery on the front side of the protruding plate 63, and covers the entire planar area of the opening end surface of the sound emitting unit 70. It is formed integrally with the lower end portion of the vertical rib 91 in such a manner as to (cover). Further, at a position on the upper surface of the coated reflector 80 at a predetermined distance from the front side edge of the coated reflector 80 to the rear side, it is arranged along the front side edge of the coated reflector 80. A protruding portion 81 that protrudes toward the opening end face of the sound emitting portion 70 is formed. A plurality of notches 82 are formed along the outer peripheral edge of the coated reflector 80 on the rear side of the coated reflector 80.

As shown in FIG. 2, on the back side of the second member 60, the spiral wall portion 64 for forming the sound path 20 forming the spiral path is aligned with the position of the welding resin portion 58 of the first member 50. Formed into an array. The starting end portion of the spiral wall portion 64 is formed in a dead end shape surrounding the through hole 54 formed in the first member 50. Further, the outer end portion of the spiral wall portion 64 is slid onto the side wall portion 65 of the second member 60.
A protruding portion 67 that protrudes toward the sound emitting portion 70 is formed at the outer end portion of the spiral wall portion 64, which is a portion connected to the sound emitting portion 70 at the outermost peripheral position of the spiral wall portion 64. Similarly, on the outermost peripheral surface of the spiral wall portion 64, an opening-side protruding portion 64 </ b> A that protrudes toward the gap portion between the protruding plate 63 and the lateral rib 92 is formed at a portion communicating with the foreign matter intrusion preventing portion 90. Has been.

Further, on the inner wall surface of the trumpet-shaped front cover 62, a similar projecting portion 67 is also formed at a portion facing the projecting portion 67 provided in a portion connected to the sound emitting portion 70 at the outermost peripheral position of the spiral wall portion 64. Yes. In addition, an opening-side protruding portion 62 </ b> A is also formed at a portion of the inner wall surface of the trumpet-shaped front cover 62 that communicates with the foreign matter intrusion preventing portion 90. Further, on the inner wall surface of the side wall surface portion 62Z of the trumpet-shaped front cover 62, an inclined plate 62B that is inclined from the upstream side to the downstream side of the sound emitting portion 70 is formed at a position above the opening side protruding portion 62A. . The inclined plate 62 </ b> B has an effect as a foreign matter intrusion prevention unit that prevents foreign matter that has entered from the sound emitting unit 70 from entering further into the sound emitting unit 70.
As shown in FIG. 2, the opening side protrusions 62A and 64A and the protrusion 67 are each formed in an edge shape in which the protrusion side tip is tapered.

  The first member 50 and the second member 60 are in a state in which the spiral wall portion 64 of the second member 60 faces the front side surface of the partition wall 51 of the first member 50, and the welding resin portion 58 and the spiral shape are formed. The sound path 20 that is integrated by applying ultrasonic vibration in a state in which the wall portion 64 is in contact with the wall portion 64 and welding the welding resin portion 58 to the spiral wall portion 64 to form a spiral path in the internal space. The main body part 40 having it is assembled.

  After the main body portion 40 is assembled, as shown in FIGS. 4 and 5, the vibration plate 30 that vibrates by the supplied power source and generates a vibration wave is housed in the vibration plate housing portion 53 of the main body portion 40. Since the vibration plate 30 is assembled and fixed to the rear surface side cover 31, the first member whose rear surface side cover 31 is a part of the vibration plate housing portion 53 is accommodated by housing the vibration plate 30 in the vibration plate housing portion 53. The diaphragm accommodating portion 53 is formed in a closed space. In this way, the vehicle horn 10 is assembled.

Next, the propagation of the vibration wave 30 in the vehicle horn 10 will be described.
The vibration wave generated by the diaphragm 30 accommodated in the diaphragm accommodating portion 53 of the main body 40 passes through the through hole 54 and is orthogonal to the vibration direction of the diaphragm 30 by the front cover 61 of the second member 60. After the reflection, the light travels around the central axis 32 of the diaphragm 30 through the sound paths 20A, 20B, 20C, 20D, and 20E, which are vibration wave propagation paths formed in the spiral path. That is, the vibration wave propagates toward the outer peripheral side of the sound path 20 (main body portion 40) while gradually separating from the central axis 32 of the diaphragm 30 along the alignment of the sound path 20.

  The vibration wave that has reached the outermost circumferential position (20E) of the sound path 20 propagates to the sound emitting section 70 connected to the outermost circumferential position (20E) of the sound path 20, and then from the vibration surface of the diaphragm 30 to the main body section 40. After being expanded in the sound emitting portion 70 formed in the trumpet-shaped space, the air is released to the outside of the main body portion 40 from the opening end face directed to the ground surface. The vibration wave emitted from the opening end surface of the sound emitting unit 70 is reflected in the horizontal plane by the covering reflector 80 disposed at a position away from the opening end surface of the sound emitting unit 70 by a required distance.

  The vehicle horn 10 according to the present embodiment is adapted to emit vibration waves from the opening end face of the sound emitting unit 70 to the outside of the main body 40 when emitting vibration waves emitted from the diaphragm 30 as a sound source. By being reflected by the coated reflector 80 arranged in an orthogonal state (a state in which the propagation of vibration waves is hindered), an alarm sound is accurately emitted from the gap portion of the foreign substance intrusion prevention unit 90 in a necessary direction. It can be configured.

The foreign matter intrusion prevention unit 90 will be described in more detail.
6 is a cross-sectional view taken along the line C-C in FIG. 3, and FIG. 7 is an end view enlargedly showing the vicinity of the opening end face of the sound emitting part of the main body along the line AA in FIG. is there.
As described above, the foreign matter intrusion prevention unit 90 has the vertical ribs 91 and the horizontal ribs 92 provided between the projecting plate 63 provided on the opening end surface of the sound emitting unit 70 and the covering reflection plate 80. doing. As shown in FIG. 6, the width dimension of the vertical rib 91 is formed on the wall section 91 </ b> A having the maximum width dimension at the front side (front side of the main body 40) position of the vertical rib 91, and the rear side (main body section). It is formed in a triangular cross section that gradually becomes narrower as it becomes (40 rear side). In the present embodiment, the configuration of the vertical rib 91 having a right-angled triangular cross section in which the wall portion 91 </ b> A at the forefront side position of the vertical rib 91 and the end side 91 </ b> B of the vertical rib 91 on the side surface side of the foreign matter intrusion prevention unit 90 are orthogonal to each other. It was adopted.

  Thus, the vehicle by the vertical rib 91 is provided by disposing the vertical rib 91 in a state where the surface of the wall portion 91 </ b> A having the maximum width is opposed to the front side (front side of the main body 40) of the vehicle horn 10. The effect of preventing foreign matter from entering from the front side of the horn 10 can be enhanced. Moreover, the left and right when the coated reflector 80 is viewed in plan rather than the central region when the coated reflector 80 is viewed in plan with respect to the foreign matter flying to the front central portion of the vehicle horn 10 by the oblique side 91C of the vertical rib 91. It is also advantageous in that it can be guided to the side region. Furthermore, the intrusion of foreign matter from the side surface of the vehicle horn 10 is prevented by the end sides 91 </ b> B of the vertical ribs 91. In the present embodiment, a mode is described in which the vertical ribs 91 are arranged at four locations excluding the central portion when the coated reflector 80 is viewed in plan along the front edge of the coated reflector 80. However, the number of the vertical ribs 91 can be changed as appropriate.

As shown in FIG. 7, the lateral rib 92 is formed with a wall portion 92 </ b> A having a maximum thickness dimension (height dimension) at the front end position of the lateral rib 92, and the thickness dimension at the rear side position of the lateral rib 92. Is formed in a wedge shape that gradually becomes thinner. The lower surface of the horizontal rib 92 is formed so as to be a right-angled surface with respect to the wall portion 92A orthogonal to the ground surface, and bends to the lower rear side immediately before the opening end surface of the sound emitting portion 70. A bent portion 92B is formed. The upper surface of the horizontal rib 92 is formed on an inclined surface 92 </ b> C whose height position gradually decreases as the wall 92 </ b> A approaches the opening end surface side of the sound emitting unit 70.
The lateral rib 92 has a minimum opening area required when the vibration wave generated by the diaphragm 30 in the foreign matter intrusion prevention unit 90 is emitted from the internal space of the vehicle horn 10 to the external space of the vehicle horn 10. If so, it is preferable to make the height of the wall 92A as high as possible, and the wall 92A extends in the height direction from the front side end of the inclined surface 92C as in the wall 92A shown in FIG. Preferably, it is formed in the shape of a deformed triangular cross section projecting into the shape.

  Further, as shown in FIG. 7, the protruding plate 63 covering the opening end surface of the sound emitting unit 70 gradually increases in thickness as the plate thickness dimension approaches the opening end surface of the sound emitting unit 70 from the front side end portion. While being formed, the lower surface side is formed into a curved surface. A portion where the rear end portion of the lower surface of the protruding plate 63 having such a curved surface and the lower end portion of the inner wall surface of the trumpet-shaped front cover 62 intersect is tapered toward the lower side (shielding reflecting plate 80 side). The edge part 66 which protrudes and forms is formed. Further, by adopting the push-out plate 63 whose lower surface is formed into a curved surface, the foreign matter that has passed through the foreign matter intrusion prevention portion 90 from the front side of the vehicle horn 10 together with the inclined surface 92C of the lateral rib 92 is removed from the body portion. It is possible to form an intruding foreign material guiding path 94 that guides movement toward the lower direction gradually from the front side of the 40 toward the rear side (guides toward the coated reflector 80 side).

  This guiding path 94 ensures that the fluid that has traveled along the lower surface of the push-out plate 63 at the edge portion 66 in the communicating portion of the opening end surface of the sound emitting portion 70, particularly when the intruding foreign matter is a fluid such as water or air. It can be peeled off from the lower surface of the push-out plate 63 (blowed off to the coated reflecting plate 80 side). That is, the fluid that has entered along the lower surface of the push-out plate 63 moves along the inner wall surface of the trumpet-shaped front cover 62 of the sound emitting unit 70 due to its viscosity, so that the fluid is caught on the sound path 20 side ( (Intrusion) can be avoided reliably.

  Further, on the upper surface of the coated reflecting plate 80, a protruding portion 81 that protrudes toward the opening end surface of the sound emitting portion 70 is formed along the front side edge of the coated reflecting plate 80. The protrusion 81 can narrow the gap at the entrance between the lower surface of the lateral rib 92 and the upper surface of the coated reflector 80. That is, it can be said that the protruding portion 81 also constitutes a part of the foreign matter intrusion preventing portion 90. Furthermore, the opening end face side portion of the sound emitting portion 70 on the lower surface side of the lateral rib 92 is formed with a bent portion 92B that bends to the coated reflecting plate 80 side (lower side), so that the coated reflecting plate 80 and the protruding portion 81 are formed. And the bent portion 92 </ b> B can guide the foreign matter flying from the front side (the front side of the main body 40) of the vehicle horn 10 with the angles α <b> 1 and α <b> 2 with respect to the upper surface of the coated reflector 80 being reduced.

  In this manner, the horizontal rib 92 having the wall portion 92A and the bent portion 92B, the shielding reflecting plate 80 having the protruding portion 81 projecting, and the pushing plate 63 forming a part of the edge portion 66 are employed. Thus, when the rear side of the main body 40 is viewed from the lower side of the front surface of the main body 40 of the foreign matter intrusion prevention unit 90, only the opening 42 is visible as shown by arrows A1 and A2 in FIG. It is formed to become. That is, the foreign matter that has entered the foreign matter intrusion prevention unit 90 travels toward the opening 42 at the shortest distance. Also from this point, it can be said that the opening end portion of the sound emitting portion 70 has a structure in which the foreign matter that has entered from the foreign matter intrusion prevention portion 90 does not easily enter the sound path 20 side.

  The inventors conducted a reliability experiment of the vehicle horn 10 assuming that the car was washed using so-called high-pressure water. As a result of this experiment, the high-pressure water that has passed through the foreign matter intrusion prevention unit 90 bounces off foreign matter such as sand remaining on the planar area of the coated reflector 80. It was confirmed that the foreign matter was discharged to the outside of the main body 40 from the opening 42 provided on the rear side of the main body 40. However, if foreign matter remains in a specific plane region of the coated reflector 80, the foreign matter bounced off by the high-pressure water will invade the sound path 20 side while rebounding to the inner wall surface of the main body 40. I have confirmed that it is rare.

Accordingly, the inventors have performed a computer simulation, and when the foreign matter remaining on the upper surface of the coated reflector 80 is blown off by high-pressure water that has entered from the outside, there is a possibility that the plane region may enter the sound path 20 side. Was calculated as the specific plane region X (see FIG. 7).
The protruding portion 81 and the edge portion 66 pass through a portion that can pass through the foreign matter intrusion prevention portion 90 (a gap portion between the protruding plate 63 and the lateral rib 92 and between the lateral rib 92 and the coated reflector 80). As shown by arrows B1 and B2 in FIG. 7, the water thus formed is not guided to the specific plane region X of the coated reflector 80 (to be guided to a plane region behind the specific plane region X). The arrangement position, shape, and size are set in an optimized state.

Due to the configuration of the projecting portion 81 and the edge portion 66 arranged in this way, foreign matter having a size that can pass through the foreign matter intrusion prevention portion 90 is guided to a planar region excluding the specific planar region X of the coated reflector 80. Will be. That is, foreign matter intrusion to the sound path 20 side is prevented, and foreign matter is reliably discharged to the outside from the opening portion 42 provided on the rear side of the main body portion 40 as shown by arrows B1 and B2 in FIG. It becomes possible. The opening side protrusions 62 </ b> A and 64 </ b> A also have the same effect as the edge portion 66 on the left and right side surfaces of the main body 40.
Further, since the traveling wind always passes through the upper surface of the coated reflecting plate 80, a notch in which foreign matter on the coated reflecting plate 80 is formed at the opening 42 or the rear edge of the coated reflecting plate 80 is formed. The discharge from the portion 82 to the outside of the main body portion 40 is also promoted, and it is possible to prevent the foreign matter from remaining on the coated reflector 80 itself. Further, the configuration in which the coated reflecting plate 80 is disposed in a state of forming an inclined surface in which the rear side position is lower than the front side position is also included as a part of the configuration for promoting the discharge of foreign matter. .

  As described above, when foreign matter such as fine sand remains on the upper surface of the coated reflector 80, the foreign matter is blown to the sound path 20 side by traveling wind or water that has entered from the foreign matter intrusion prevention unit 90. And can be reliably discharged from the opening 42 to the outside of the vehicle horn 10. Therefore, it is possible to reliably prevent the occurrence of a failure due to the entry of a foreign substance into the sound path 20 of the vehicle horn 10.

Further, as shown in FIGS. 7 and 8, the rear side end surface position of the opening end surface of the sound emitting unit 70 is formed at a position higher than the front side end surface position of the opening end surface of the sound emitting unit 70. Thereby, after the foreign matter that has entered the main body portion 40 from the front side of the vehicle horn 10 collides with the partition wall 51 that is the wall surface on the rear side of the sound emitting portion 70, a part of the foreign matter travels along the partition wall 51. Foreign matter is prevented from entering the 20 side.
Further, the crank wall 56 provided at the position of the rear side end surface of the opening end surface of the sound emitting unit 70 forms a surplus space in the rear side portion of the sound emitting unit 70, and this surplus space forms the main body 40. It is also possible to function as a buffer unit 100 for temporarily storing water that has entered the water.

The operation of the buffer unit 100 will be described.
As is apparent from FIGS. 7 and 8, the buffer unit 100 is formed between the opening end surface on the rear side of the sound emitting unit 70 and the coated reflector 80, and the crank wall 56 is close to the coated reflector 80. The part has a shape in which the cross-sectional area of the flow path rapidly shrinks. Due to the presence of such a buffer unit 100, sound is emitted by temporarily returning a part of water, which is a foreign matter that has entered the upper surface of the coated reflector 80, to the front side of the main body unit 40 without discharging it from the opening 42. The eddy current as shown by the arrow in FIG. 8 is generated at the position on the opening end face side of the portion 70. Foreign substances such as sand and pebbles on the upper surface of the coated reflector 80 can be washed away by the vortex of the water generated in this way.

  In this way, due to the vortex generated in the upper part of the shielding reflector 80, some water may enter the sound path 20 side along the partition wall 51 of the first member 50 that is the rear side wall surface of the main body 40. However, the entry of water to the sound path 20 side is prevented by the foreign matter intrusion prevention wall 57 provided in the partition wall 51. As shown in FIG. 8, the foreign matter intrusion prevention wall 57 provided in the partition wall 51 is such that the standing wall surface on the opening end side of the sound emitting unit 70 is erected substantially at right angles to the surface of the partition wall 51. Therefore, it is possible to reliably prevent the entry of foreign matter from the opening end face side of the sound emitting portion 70 to the sound path 20 side, and to guide the vortex flow caused by the foreign matter to the front side of the main body portion 40. Such foreign matter intrusion prevention walls 57 are arranged at a plurality of locations in the depth direction of the sound emitting unit 70. Therefore, it can be said that the foreign matter intrusion prevention wall 57 also constitutes a part of the buffer unit 100.

  The water guided to the front side of the main body 40 by the foreign matter intrusion prevention wall 57 collides with the trumpet-shaped front cover 62 and is guided toward the upper surface of the coated reflector 80 along the inner wall surface shape of the trumpet-shaped front cover 62. Will be. The inner wall surface of the trumpet-shaped front cover 62 forms an edge portion 66 together with the lower surface of the protruding plate 63 at the opening end surface position of the sound emitting portion 70, and the tip portion of the edge portion 66 is in relation to the upper surface of the coated reflector 80. It is formed so as to protrude at a substantially right angle. Thereby, water is struck at a substantially right angle with respect to the upper surface of the coated reflector 80, and sand and the like on the coated reflector 80 can be removed. Further, since the water returned to the coated reflector 80 does not reduce the intrusion speed of wind or water entering from the foreign matter intrusion prevention unit 90, sand from the opening 42 provided on the rear side of the main body 40, etc. Both are discharged from the opening 42 to the outside of the main body 40 without hindering foreign matter discharge.

  Further, as shown in FIGS. 8 and 9, the entry of foreign matter into the sound path 20 is at the start end position (boundary portion with the sound path 20) of the sound emitting unit 70 further upstream from the foreign object intrusion prevention wall 57. As a configuration for preventing this, the first member 50 is formed with a protrusion 59, and the second member 60 is formed with a protrusion 67. These projecting portions 59 and 67 are erected so as to go around the inner wall surface of the sound emitting portion 70 in a direction orthogonal to the extending direction of the sound emitting portion 70. When the main body 40 is viewed from the front, a suitable arrangement position of the protrusions 59 and 67 is that the through hole 54 formation position of the partition wall 51 is a center point, and the top position of the main body 40 is the starting point. A position rotated in the range of 40 ° to 60 ° on the opening end side is preferable. In the present embodiment, the protrusions 59 and 67 are erected at a portion where this angle is 50 °.

Immediately after the diaphragm 30 starts to vibrate from the non-vibrating state, the pressure of the diaphragm housing portion 53 becomes low, and the pressure of the sound path 20 communicating with the diaphragm housing portion 53 through the through hole 54 is also low. Moreover, it becomes low pressure. As a result, there is a risk that very small foreign matter in the sound emitting section 70 communicating with the sound path 20 may be sucked into the sound path 20, and the protrusions 59 and 67 are immediately after the vibration of the diaphragm 30 starts. It functions as a final foreign matter intrusion prevention unit for capturing foreign matter (preventing entry into the sound path 20) that is about to be sucked into the sound path 20 by the resulting reduced pressure state.
As the protrusions 59 and 67 in the present embodiment, those having a protrusion height of about 2 mm are used. The protrusion height of the protrusions 59 and 67 can be changed as appropriate.

  Such protrusions 59 and 67 are preferably formed with an edge portion on the opening end side of the sound emitting portion 70 on the foreign substance intrusion side. Further, as shown in FIG. 2, in order to prevent the vibration wave from entering the sound emitting unit 70 from the sound path 20 as much as possible, the wall on the sound path 20 side of the projecting parts 59 and 67, and the sound It is further preferable that the space between the inner wall surface of the road 20 is formed in a shape slid by a relaxation curve.

Although the vehicle horn 10 according to the present embodiment has been described in detail above, the vehicle horn 10 according to the present invention is not limited to the configuration of the present embodiment. For example, in the above embodiment, the foreign matter intrusion prevention unit 90 is formed between the opening end surface of the sound emitting unit 70 and the shielding reflection plate 80 by the four vertical ribs 91 and the one horizontal rib 92. The foreign matter intrusion prevention unit 90 is not limited to this form. The number of the vertical ribs 91 and the horizontal ribs 92 may be appropriately changed according to the width between the opening end surface of the sound emitting unit 70 and the shielding reflection plate 80.
Moreover, if the clearance gap formed between the opening end surface of the sound emission part 70 and the upper surface of the coating reflective plate 80 is narrow, the structure of the foreign material penetration | invasion prevention part 90 can also be abbreviate | omitted.

  Further, the shape of the edge portion 66 formed by intersecting the lower end portion of the inner wall surface of the trumpet-shaped front cover 62 and the lower surface rear end portion of the protruding plate 63 is that the water that has traveled along the lower surface of the protruding plate 63 is the edge portion. It suffices if it can be separated from the push-out plate 63 at 66. In other words, the inclination angle of the edge portion 66 with respect to the shielding reflection plate 80 may not be substantially perpendicular, and may be formed in a shape protruding in a direction approaching the opening 42 and the covering shielding plate 80.

Further, it is possible to omit the arrangement of the crank wall portion 56 and employ a configuration in which the opening area of the opening 42 on the rear surface side of the main body portion 40 is further expanded as compared with the present embodiment. According to this configuration, the buffer unit 100 is not configured, but all foreign matters flying from the front side of the main body 40 can be discharged from the opening 42 to the outside of the main body 40.
Furthermore, the number and shape of the foreign object intrusion prevention walls 57 provided in the internal space of the sound emitting unit 70 may be changed as appropriate.

Further, the covering shielding plate 80 may be configured to be disposed on a horizontal plane.
Furthermore, it is also possible to adopt a configuration of the main body portion 40 in which the push-out plate 63, the foreign matter intrusion prevention portion 90, and the coated reflection plate 80 are formed separately and integrated by assembly.

10: Vehicle horn 12: Mounting plate 20, 20A, 20B, 20C, 20D, 20E: Sound path 30: Diaphragm 31: Rear side cover 32: Center axis
40: Body portion 42: Opening portion 50: First member 51: Partition wall 52: Side wall 53: Diaphragm housing portion 54: Through hole 55: Expansion wall portion 56: Crank wall portion 57: Foreign matter intrusion prevention wall 58: Welding resin Portion 59: Protruding portion 60: Second member 61: Partition wall 62: Trumpet-shaped front cover 62A: Opening side protruding portion 62B: Inclined plate 62Z: Side wall surface portion 63: Extruding plate 64: Spiral wall portion 64A: Opening side Protruding portion 65: Side wall portion 66: Edge portion 67: Protruding portion 70: Sound emitting portion 80: Covered reflector 81: Protruding portion 82: Notch portion 90: Foreign matter intrusion preventing portion 91: Vertical rib 91A: Wall portion 91B: End Side 91C: Oblique side 92: Horizontal rib 92A: Wall portion 92B: Bent portion 92C: Inclined surface 94: Guideway 100: Buffer portion X: Specific plane area

Claims (3)

A sound source housed in the main body,
A sound path formed in a spiral path that is provided in the main body and serves as a propagation path of a vibration wave generated by the sound source;
A sound emitting part for emitting the vibration wave propagated in the sound path to the outside of the main body part;
It is disposed at the ground surface side position away from the opening end face of the sound emitting part that opens toward the ground surface, covers a planar area on the opening end face of the sound emitting part, and transmits the vibration wave from the sound path to the sound path. A coated reflector that reflects to the outside of the main body,
A trumpet-shaped front cover serving as a wall surface on the front side of the sound emitting part is formed on the main body part,
The opening end face of the sound emitting part is provided with a push-out plate that protrudes outside the plane area of the opening end face of the sound emitting part,
A vehicle horn characterized in that an edge portion projecting in the direction toward the coated reflector is formed by a rear end portion on a lower surface side of the protruding plate and a lower end portion on an inner wall surface of the trumpet-shaped front cover.   2. A foreign matter intrusion prevention portion is formed by a lateral rib and a longitudinal rib at a front side portion of the main body between the opening end face of the sound emitting portion and the coated reflector. The vehicle horn as described.   The vehicle horn according to claim 2, wherein the protruding plate, the foreign matter intrusion preventing portion, and the coated reflecting plate are integrally formed.

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