JP2017072649A - Horn for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horn for a vehicle that improves a sound pressure level even with a simple configuration without increasing a manufacturing cost nor mass, and can maintain initial performance over a long period.SOLUTION: A horn 100 for a vehicle includes: a body 10 that is formed into a cylinder having an inner bottom part; an electromagnet 20 that is fixed to the body 10; a vibration plate 30 that is attached to the body 10 via a shaft 26 of the electromagnet 20 in an arrangement covering an opening part of the body 10; and a resonance plate 40 that is fixed to the shaft 26 at a front position further than the vibration plate 30. An outer peripheral edge position of the vibration plate 30 is extended further to the outside in a radial direction from an outer periphery edge position of the resonance plate 40, and in an extension part of the vibration plate 30, a folding part 32 is formed that is folded toward the resonance plate 40.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle horn mounted as an alarm on a vehicle such as an automobile.

  A configuration of a vehicle horn that generates an alarm sound by intermittently moving a shaft to and from an iron core by the action of an electromagnet and vibrating a diaphragm is well known, without needing to be exemplified. In general, since the vehicle horn issues a warning to pedestrians and drivers of other vehicles around the host vehicle, the vehicle horn is required to emit an alarm sound with a sufficient sound pressure. For this purpose, a strong electromagnet or a large diaphragm may be applied to the vehicle horn. However, in this method, a strong electromagnet or a large diaphragm is practically used because it increases the vehicle weight. Can not do it.

  In recent years, Patent Document 1 proposes a vehicle horn that can generate an alarm sound having a sufficient sound pressure without changing the size of an electromagnet or a diaphragm. This vehicle horn has a cylindrical shape that is fixed at one end to the outer peripheral edge of the body (housing) and surrounds the outer periphery of the diaphragm and the resonance plate in order to actively guide the alarm sound generated by the diaphragm to the front of the alarm device. A member is provided.

JP 2013-25078 A

  However, in the configuration of the vehicle horn disclosed in Patent Document 1, it is necessary to manufacture a tubular member for preventing sound diffusion separately from the diaphragm, and one end of the tubular member is provided on the body of the vehicle horn. It must be attached by elastically deforming the part radially outward. For this reason, the manufacturing cost of the vehicle horn increases, and the height of the movable iron core in the axial direction increases and the mass also increases. In addition, since the tubular member is separately attached to the body, the attachment portion (elastically deformed portion) between the tubular member and the body deteriorates over time, and the tubular member is unintentionally detached from the body, and the sound There is also a risk that the pressure cannot be increased.

  Accordingly, the present invention has been made to solve the above-mentioned problems, and the object of the present invention is to improve the sound pressure level while maintaining a simple configuration without increasing the manufacturing cost and mass, and for a long time. An object of the present invention is to provide a vehicle horn capable of maintaining the initial performance.

As a result of intensive studies by the inventor in order to solve the above-mentioned problems, the following configuration has been conceived.
That is, the present invention is attached to the body via the shaft of the electromagnet in a configuration that covers the body formed in the cylindrical body having the inner bottom, the electromagnet fixed to the body, and the opening of the body. A vehicle horn having a diaphragm and a resonance plate fixed to the shaft at a position forward of the diaphragm, wherein the outer peripheral edge position of the diaphragm is more radial than the outer peripheral position of the resonance plate A vehicular horn characterized in that a bent portion that extends to the outside and is bent toward the resonance plate is formed in an extended portion of the diaphragm.

  By forming the bent portion in the diaphragm in this way, the alarm sound generated between the diaphragm and the resonance plate is reflected forward from the resonance plate, so that the vehicle at the front position (sound pressure measurement reference position). The sound pressure level of the alarm sound can be improved.

  Moreover, it is preferable that the said bending part is formed in the shape which expands from the said diaphragm toward the said resonance plate.

  Thereby, the warning sound can be emitted not only in a limited range in front of the vehicle but also in a wide range in front of the vehicle.

  The diaphragm is mounted in a state of being recessed inward from the opening of the body, and the bent portion is bent toward the opening of the body along the inner wall surface of the body. At the same time, it is preferably superimposed on the end of the body on the opening side.

  As a result, the alarm sound generated between the diaphragm and the resonance plate does not enter the rear side of the diaphragm (that is, the back side of the vehicle horn). The alarm sound can be reliably reflected toward the front side. Thereby, since it is not necessary to enlarge the diaphragm, it is possible to avoid the enlargement of the electromagnet for vibrating the diaphragm, and to promote the miniaturization of the vehicle horn.

  By adopting the configuration of the vehicle horn according to the present invention, it is a simple configuration without increasing the manufacturing cost and mass, improving the sound pressure level of the alarm sound and maintaining the initial performance over a long period of time. A vehicle horn that can be provided can be provided.

It is a front view of the horn for vehicles concerning this embodiment. It is a perspective view from the front side of the horn for vehicles concerning this embodiment. It is a right view of the horn for vehicles concerning this embodiment. It is sectional drawing in the AA line in FIG. It is a perspective view which shows the structure of the bobbin and iron core in this embodiment. It is a perspective view which shows the state which isolate | separated the bobbin and iron core of FIG. It is a graph which shows the relationship between the separation distance of the contact surfaces of an iron core and a shaft, and the strength of mutual attraction. FIG. 5 is an enlarged view of a portion B in FIG. 4. FIG. 5 is an enlarged view of a portion C in FIG. 4. It is explanatory drawing which shows the modification of a bending part.

Hereinafter, an embodiment of a vehicle horn according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, a vehicle horn 100 according to the present embodiment includes a body 10 that forms a bottomed cylindrical body having one end opened and the other end formed in a bottom, and a bottom side of the body 10. The electromagnet 20 accommodated in the internal space, the vibration plate 30 disposed so as to cover the opening of the body 10, and the resonance plate 40 disposed at a front position of the vibration plate 30 are provided.
Although the vehicle horn 100 has various configurations other than these, since other configurations not described in the present specification can adopt the same configuration as a known vehicle horn, Detailed description of is omitted.

  The body 10 is formed in a deformed bottomed cylindrical body provided with an inner bottom portion 12 having a reduced diameter at the bottom portion on the back side of the vehicle horn 100. A through hole 12 </ b> A is formed in the inner bottom portion 12 of the body 10. An electromagnet 20 is assembled to the inner bottom portion 12 by passing an iron core 22 as a fixed core of the electromagnet 20 described later through the through hole 12A and caulking the iron core 22 to the inner bottom portion 12. A bracket 60 for mounting the vehicle horn 100 to a vehicle (not shown) is attached to the iron core 22 exposed to the back side of the inner bottom portion 12 from the through hole 12A.

  An electromagnet 20 is accommodated in the internal space of the body 10. In this embodiment, similarly to the general electromagnet 20, it has an iron core 22 as a fixed core, a coil 24 (winding) wound around a bobbin 25, and a shaft 26 as a movable core. When the electromagnet 20 (coil 24) is energized, the shaft 26 is attracted to the iron core 22, and when the shaft 26 pushes the contact plate 50, the connection between the contact plate 50 and the contact 70 is released and the energization is stopped. Move away from the iron core 22. When the shaft 26 is separated from the iron core 22, energization by the contact plate 50 and the contact 70 is resumed, and the shaft 26 is attracted to the iron core 22 again. By repeating this operation, the vibration plate 30 attached to the shaft 26 and the resonance plate 40 resonating with the vibration plate 30 vibrate to generate an alarm sound (air vibration).

  The configuration of the electromagnet 20 will be described with reference to FIGS. As shown in FIG. 4, the iron core 22 has a large-diameter portion 22A and a small-diameter portion 22B, and a cylindrical protrusion at the end in the height direction of the large-diameter portion 22A (the upper end portion of the iron core 22). 22C is formed. Further, as shown in FIG. 6, a circumferential protrusion 22 </ b> D is formed on the side circumferential surface of the large diameter portion 22 </ b> A at a necessary interval along the circumferential direction. The circumferential protrusion 22D is formed in a protrusion that protrudes radially outward from the side peripheral surface of the large diameter portion 22A. Further, an intermediate diameter portion 22E is formed between the large diameter portion 22A and the small diameter portion 22B (see FIG. 4).

  As shown in FIG. 6, the bobbin 25 around which the coil 24 is wound has a cylindrical winding portion 25A and flanges 25B formed at both ends of the winding portion 25A. As shown in FIGS. 5 and 6, the flange 25B according to the present embodiment is not disposed in the entire circumferential direction of the winding portion 25A, and is missing at a necessary interval along the circumferential direction of the winding portion 25A. A portion 25C is formed. The positions of the missing portion 25C at one end of the winding portion 25A and the missing portion 25C at the other end of the winding portion 25A are provided in an alternate arrangement in the circumferential direction of the winding portion 25A. At one end of the winding portion 25A, a notch 25D is formed in accordance with the position of the missing portion 25C. Thus, the bobbin 25 can be reduced in weight by cutting out a part of the winding portion 25A and the flange 25B.

  Further, the notch 25D formed in the winding portion 25A corresponds to the arrangement position and the arrangement range of the circumferential protrusion 22D of the iron core 22 (see FIG. 6). The iron core 22 and the bobbin 25 can be assembled together by causing the circumferential protrusion 22D of the iron core 22 to enter the notch 25D and fitting the concave and convex portions. Further, if the thickness of the winding portion 25A and the protrusion height of the circumferential protrusion 22D of the iron core 22 are formed to be equal, the circumferential protrusion 22D of the iron core 22 on the outer peripheral surface of the winding portion 25A. Can be exposed. By winding the winding around the winding portion 25A in which the iron core 22 is exposed on a part of the outer peripheral surface, it is possible to bring a part of the winding into contact with the circumferential protrusion 22D of the iron core 22. It is possible to improve the magnetic force of the electromagnet 20. That is, since the number of windings of the coil 24 around the bobbin 25 can be reduced, the electromagnet 20 can be reduced in weight and the manufacturing cost can be reduced.

  Further, the bobbin strength is secured by the iron core 22 inserted in the center, and the notch 25D is elastically deformed by the force when the coil 24 is wound around the winding portion 25A so that the circumferential protrusion 22D is pinched. The winding portion 25A is compressed in the circumferential direction. Thereby, the bobbin 25 and the iron core 22 can be fixed in an integrated state.

  The electromagnet 20 formed in this way has the small diameter portion 22B and the medium diameter portion 22E of the iron core 22 inserted through the through hole 12A of the inner bottom portion 12 of the body 10, and a caulking member (not shown) is used for the medium diameter portion 22E. The electromagnet 20 is fixed to the inner bottom 12 of the body 10 at a portion. The tip portion of the small diameter portion 22B is formed in a bolt shape, and the bracket 60 can be attached.

  Further, as shown in FIGS. 4 and 8, the shaft 26 as a movable core that is a part of the configuration of the electromagnet 20 has a contact surface with the iron core 22 at the upper end of the large-diameter portion 22 </ b> A of the iron core 22 ( The protrusions 22C formed on the upper end surface) are formed in the recesses 26A that can be concavo-convexly fitted.

  It is known that the suction force is inversely proportional to the square of the separation distance between the separation distance between the contact surfaces of the iron core 22 and the shaft 26 and the strength of the mutual suction force. FIG. 7 is a graph showing the relationship between the separation distance (core gap) between the contact surfaces of the iron core 22 and the shaft 26 and the strength of the mutual attractive force. A graph represented by a broken line is a graph in the prior art (the contact surfaces of the iron core 22 and the shaft 26 are flat surfaces). Therefore, when assembling the vehicle horn 100 and / or adjusting the position of the contact plate 50 after the assembly, the distance between the contact surfaces of the iron core 22 and the shaft 26 is adjusted with high accuracy. There must be.

  In this regard, like the iron core 22 and the shaft 26 according to the present embodiment, the contact surfaces (projections 22C and recesses 26A) of each other are formed in a shape in which recesses and protrusions are fitted, so that FIG. As shown in FIG. 8B, when the contact surfaces of the iron core 22 and the shaft 26 (projection 22C and recess 26A) are moved toward and away from each other, the separation distance in the plane portion perpendicular to the direction of contact and separation is obtained. d1 and the separation distance d2 in the plane portion parallel to the contact / separation direction can be made different. As a result, as shown in the graph shown by the solid line in FIG. 7, a sudden change in the attractive force when the iron core 22 and the shaft 26 are moved toward and away from each other can be greatly reduced. This is advantageous in that adjustment (tuning) of the range in which 50 is on can be easily performed. Further, as is apparent from the graph of FIG. 7, the suction force when the contact plate 50 is turned on can be increased as compared with the prior art.

  Further, the contact plate 50 can be further tuned by widening the range in which the separation distance d1 in the plane portion perpendicular to the contact / separation direction and the separation distance d2 in the plane portion parallel to the contact / separation direction can be made different. It can be done easily. As an example other than the present embodiment, the protrusion of the protrusion 22C of the iron core 22 as well as an embodiment in which the number of locations constituting the separation distance d2 in the plane portion parallel to the contact / separation direction of the iron core 22 and the shaft 26 is increased. It is preferable to adopt a form in which the height h1 and the depth h2 of the recess 26A of the shaft 26 are increased as much as possible.

  The diaphragm 30 that vibrates by the operation of the electromagnet 20 is attached to the body 10 via the shaft 26 by inserting the shaft 26. The resonance plate 40 that resonates with the vibration plate 30 is formed with a diameter smaller than the diameter size of the vibration plate 30 (the diameter size of the opening surface of the body 10), and by inserting the shaft 26 in the same manner as the vibration plate 30. Is retained. A spacer 42 is disposed between the resonance plate 40 and the vibration plate 30, and the resonance plate 40 is positioned at a front side of the vibration plate 30 with a required distance from the vibration plate 30. It is attached to the body 10 so as to cover (the front part of the diaphragm 30).

  The alarm sound of the vehicle horn 100 is generated by causing the shaft 26 to contact and separate from the iron core 22 by the action of the electromagnet 20 to vibrate the diaphragm 30 and resonate the diaphragm 40 with the diaphragm 30. It is generated by vibrating the air between the resonant plate 40. It is important how to efficiently emit the alarm sound (vibrated air) generated in this way toward the front of the vehicle horn 100.

  In this regard, in the present embodiment, the bent portion 32 is formed by bending the required width range in the radial direction of the outer peripheral edge of the vibration plate 30 in accordance with the shape of the body 10 at the radially outer portion from the outer peripheral edge of the resonance plate 40. Forming. As shown in FIGS. 4 and 9, the vibration plate 30 has a position of the main plane 33 that is a plane portion radially inward from the portion where the bent portion 32 is formed, and the position of the main plane 33 rather than the position of the opening end surface of the body 10. 10 is disposed so as to cover the opening of the body 10 in a state of being located at a position on the inner bottom side of the body 10.

  The bent portion 32 is formed in a diameter-expanded shape that gradually increases in diameter as it moves away from the bending start position of the bent portion 32 toward the position where the resonance plate 40 is disposed (the front side of the vehicle horn 100). ing. The outer peripheral edge portion 32 </ b> A of the bent portion 32 is bent so as to go to the rear side of the body 10 along the outer surface of the outer peripheral edge portion 14 of the body 10. Although the body 10 and the diaphragm 30 are close to or in close contact with each other, they are not integrated.

  By adopting the shape of the diaphragm 30 as shown in this embodiment, a gap S that opens on the front side of the vehicle horn 100 is formed in the space (alarm sound generation space) between the diaphragm 30 and the resonance plate 40. Will be formed. In this way, no sound entry portion is provided between the body 10 and the diaphragm 30, and an alarm sound generation space between the diaphragm 30 and the resonance plate 40 is opened to the front side of the vehicle horn 100. By providing the gap S, all vibration waves of air generated by the diaphragm 30 and the resonance plate 40 can be emitted from the gap S toward the front of the vehicle horn 100 as an alarm sound.

  By adopting such a configuration of the diaphragm 30, it is possible to emit an alarm sound having a sufficient sound pressure as required without enlarging the electromagnet 20 and the diaphragm 30. As a result of the experiment by the applicant, it was confirmed that the alarm sound of the vehicle horn 100 of the present embodiment has a sound pressure equal to or higher than the alarm sound of the applicant's conventional product.

  Further, the outer peripheral edge portion 32A of the bending portion 32 of the diaphragm 30 is bent along the back side of the body 10 (vehicle horn 100), so that the opening of the body 10 is completely covered by the diaphragm 30. It can be in the state. Thereby, even if the sound-release gap S is formed on the front side of the vehicle horn 100, foreign matter can be reliably prevented from entering the internal space of the body 10 from the front side of the vehicle horn 100. . Even if foreign matter enters the alarm sound generation space between the diaphragm 30 and the resonance plate 40 from the gap S, the foreign matter is discharged from the position of the gap S to the outside of the vehicle horn 100 by the action of gravity. Can be made.

  Although the form of the vehicle horn 100 according to the present invention has been described above based on the embodiment, the technical scope of the present invention is not limited to the above embodiment. For example, as the shapes of the iron core 22 and the bobbin 25 of the electromagnet 20 described in the present embodiment, a known shape of the iron core 22 and the bobbin 25 as in the prior art may be adopted. In addition, although the description has been given based on the embodiment in which the contact surfaces of the iron core 22 and the shaft 26 are formed in a shape that can be unevenly fitted, the contact surfaces of the iron core 22 and the shaft 26 are made flat with each other. Of course, a formed form is also possible.

  Moreover, although the bending part 32 of the diaphragm 30 demonstrated the form formed in a diameter enlarged shape as it approached the outer periphery edge of the diaphragm 30, as shown in FIG. The plate 30 may be bent at a right angle. In short, by forming the bent portion 32 at a position outward from the outer peripheral edge of the resonance plate 40, the vibration air generated in the alarm sound generation space between the vibration plate 30 and the resonance plate 40 is used for the vehicle. The clearance S for discharging toward the required range in front of the horn 100 may be formed. In the diaphragm 30, the angle α formed by the bent portion 32 and the main plane 33 is preferably about 90 to 135 degrees.

10 body, 12 inner bottom, 12A through hole, 14 outer peripheral edge,
20 electromagnet, 22 iron core, 22A large diameter part, 22B small diameter part, 22C protrusion,
22D circumferential protrusion, 22E medium diameter part,
24 coils,
25 bobbin, 25A winding part, 25B flange, 25C missing part, 25D notch part,
26 shaft, 26A recess,
30 diaphragm, 32 bent part, 32A outer peripheral part, 33 main plane,
40 resonant plate, 42 spacer,
50 contact plates, 60 brackets, 70 contacts, 100 vehicle horns,
d1 The separation distance in the plane portion perpendicular to the contact / separation direction,
d2 The separation distance in the plane portion parallel to the contact and separation direction,
S clearance

Claims (3)

A body formed in a cylindrical body having an inner bottom, an electromagnet fixed to the body, a diaphragm attached to the body via a shaft of the electromagnet in an arrangement covering the opening of the body, and the vibration A vehicle horn having a resonance plate fixed to the shaft at a position forward of the plate,
The outer peripheral edge position of the diaphragm is extended to the outside in the radial direction from the outer peripheral edge position of the resonance plate, and a bent portion that is bent toward the resonance plate is formed in the extended portion of the vibration plate. A horn for a vehicle.   2. The vehicle horn according to claim 1, wherein the bent portion is formed in a shape that expands from the diaphragm toward the resonance plate.   The diaphragm is mounted in a state of being recessed inward from the opening of the body, and the bent portion is bent toward the opening of the body along the inner wall surface of the body, The vehicle horn according to claim 1, wherein the horn is overlaid on an end of the body on the opening side.

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