JP2024122206A - Automobile alarm sound generator - Google Patents

Abstract

[Problem] To provide an automobile alarm sound generator that can improve the range of sound pressure adjustment, prevent damage to the diaphragm, and eliminate blackening of the diaphragm by eliminating the restriction on the diameter size of the resonator. [Solution] The automobile alarm sound generator 100 of the present invention comprises a housing 10, a core 20 fixed to the center of the bottom surface of the housing 10, a bobbin 30 on which the core 20 is disposed and on which a coil 31 is wound, an armature 40 disposed opposite the core 20, a diaphragm 50 and a resonator 60 fixed by crimping to the armature 40, and a terminal 70 to which power is supplied, and is characterized in that the diameter of the resonator 60 is the same as or larger than the diameter of the diaphragm 50. [Selected Figure] Figure 2

Description

The present invention relates to an alarm sound generating device for automobiles.

As an automobile warning sound generating device consisting of a flat electric horn, a flat electric horn has been proposed that has a cylindrical housing with a bottom, an electromagnet housed and fixed near the center of the housing, a diaphragm fixed to the outer periphery of the housing and covering the opening of the housing, a movable iron core fixed near the center of the inside of the diaphragm and arranged opposite the electromagnet, a resonance plate fixed to the outside of the diaphragm, and a terminal box attached to the outside of the housing, characterized in that a terminal box shielding member with a shielding plate approximately parallel to the bottom surface of the housing is provided on the outer periphery of the housing (for example, Patent Document 1).

In such conventional automobile warning sound generating devices, the diameter of the resonator is smaller than the diameter of the diaphragm. This is because the conventional manufacturing method employs a process in which the resonator and diaphragm are fixed and integrated by crimping means or the like, then these are attached to the horn body and the outer periphery of the diaphragm is crimped and fixed to the housing. Therefore, unless the diameter of the resonator is smaller than the diameter size of the diaphragm, it is not possible to install a crimping machine on the outer periphery of the diaphragm, and there is a problem that the manufacturing process does not work.

JP 2013-61488 A

The present invention was made in consideration of these problems, and the object of the present invention is to provide an automobile alarm sound generating device that can improve the range of sound pressure adjustment, prevent damage to the diaphragm, and eliminate the blackening of the diaphragm by eliminating the restriction on the diameter size of the resonator.

To achieve the above-mentioned objective, the present invention adopts the following measures.

The alarm sound generating device for an automobile according to the present invention comprises:
Housing and
a core fixed to the center of a bottom surface of the housing;
a bobbin on which the core is disposed and on which a coil is wound;
an armature disposed opposite the core;
a diaphragm and a resonator plate fixed to the armature by crimping;
A terminal to which power is supplied;
Equipped with
The diameter of the resonator is the same as or larger than the diameter of the diaphragm.

In the automobile alarm sound generating device according to the present invention, the diameter of the resonator is the same as or larger than the diameter of the diaphragm. This allows for a wider range of resonator diameter sizes to be selected, and allows for more extensive sound pressure adjustment. Furthermore, by making the diameter of the resonator larger than the diameter of the diaphragm, the resonator can cover the entire diaphragm. Therefore, the resonator, which is generally made thicker than the diaphragm, can withstand chipping (flying stones) during driving, reducing the possibility of the diaphragm being damaged. Furthermore, since the resonator covers and conceals the diaphragm, it is possible to abolish blackening, such as painting the diaphragm black, which is usually done to ensure the aesthetic appearance of the diaphragm.

The vehicle alarm sound generating device of the present invention may be characterized in that the thickness of the resonator is two to three times the thickness of the diaphragm. By adopting such a configuration, the resonator can more effectively reduce the possibility of the diaphragm being damaged by chipping (flying stones) while driving.

Furthermore, there is provided a method for producing an automobile alarm sound generating device, comprising the steps of:
(1) A setting step of setting a core, a bobbin around which a coil is wound and on which the core is placed, and an armature disposed opposite the core, in a housing.
(2) An outer periphery crimping process in which the central hole of the diaphragm is fitted into the small diameter portion of the upper part of the armature and the outer periphery of the diaphragm is crimped to a crimping edge. (3) A jig attachment process in which the core and the housing are attached to a lower jig. (4) An armature crimping process in which the central hole of the resonator is fitted into the small diameter portion of the armature so that it is positioned on the upper surface side of the diaphragm, a washer is pressed down with a guide, and the armature is pressed into contact with the core, and the small diameter portion of the armature is crushed with an insert to crimp and fix it.

Conventionally, the diaphragm and resonator were crimped to the armature and then fixed to the housing by crimping the outer periphery of the diaphragm. Therefore, if the diameter of the resonator was not smaller than that of the diaphragm, the resonator would get in the way and the outer periphery of the diaphragm could not be crimped. However, in the present invention, a manufacturing method is adopted in which the outer periphery of the diaphragm is crimped and then the resonator is fixed to the armature, which removes the restriction on the diameter of the diaphragm and allows a resonator larger than the diaphragm to be attached.

FIG. 1 is an exploded perspective view showing an alarm sound generating device 100 for an automobile according to an embodiment. FIG. 2 is a cross-sectional view showing the warning sound generating device 100 for an automobile according to the embodiment. FIG. 3 is an explanatory diagram for explaining a method for producing the alarm sound generating device 100 for an automobile according to the embodiment.

The following describes in detail an embodiment of the present invention with reference to the drawings. Note that the embodiments and drawings described below are intended to illustrate a portion of the embodiment of the present invention, and are not intended to be used to limit the present invention to these configurations. In addition, corresponding components in each drawing are denoted by the same or similar reference numerals.

As shown in Figs. 1 and 2, the vehicle alarm sound generating device 100 according to the embodiment mainly comprises a housing 10, a core 20 fixed to the center of the bottom surface of the housing 10, a bobbin 30 on which the core 20 is arranged and on which a coil 31 is wound, an armature 40 arranged opposite the core 20, a diaphragm 50 and a resonance plate 60 fixed by crimping to the armature 40, a terminal 70 to which power is supplied, and a mounting stay 80 fixed to the bottom of the housing 10 for mounting to a vehicle or the like.

The housing 10 is made of a magnetic material to form part of the magnetic circuit, and has a lower bottomed cylindrical portion 10a in which the core 20 and bobbin 30 are housed, and an upper cylindrical portion 10b with a larger diameter than the lower bottomed cylindrical portion 10a. The opening edge of the upper opening is formed with a crimping edge portion 10c for crimping the diaphragm 50.

The core 20 is made of a magnetic material and is fixed to the center of the lower bottomed cylindrical portion 10a of the housing 10 by crimping or the like. The lower side of the core 20 is threaded, and a conductive mounting stay 80 is fixed with a bolt 81.

The bobbin 30 is made of resin and has a coil 31 wound around it. A central hole is formed in the center of the bobbin 30, and the core 20 is located below the central hole, and the lower cylindrical portion 41 of the armature 40 is located above it.

A movable contact support plate 35, a fixed contact support plate 36, and an insulator 37 interposed between them are stacked on the upper surface of the bobbin 30 within the upper cylindrical portion 10b, and are made of a metal spring material. These members are fixed by crimping with a metal rivet 38.

A movable contact 35a is fixed to the movable contact support plate 35, and a fixed contact 36a is fixed to the fixed contact support plate 36. When the coil 31 is not energized, the movable contact 35a is pressed against the fixed contact 36a by the spring force of the movable contact support plate 35.

The armature 40 is made of a magnetic material and has a lower cylindrical portion 41, an upper small diameter portion 43, and a flange portion 42 with a large outer periphery formed therebetween. This flange portion 42 constitutes the pressing portion that presses the movable contact support plate 35 downward.

The diaphragm 50 is a plate of iron-based magnetic material pressed into a concave shape to form part of the magnetic circuit. The diaphragm 50 has a central hole 51 formed as a through hole in the center, and this central hole 51 is fitted into the small diameter portion 43 of the armature 40. The outer periphery is fixed to the housing 10 by crimping the outer periphery of the crimping edge 10c formed on the edge of the upper opening of the housing 10.

The resonator 60 is made of metal and formed into a disk shape with a central hole 61 formed as a through hole in the center, and this central hole 61 is fitted into the small diameter portion 43 of the armature 40 and fixed by crimping. The resonator 60 according to the present invention has a diameter equal to or larger than the diameter of the diaphragm 50 whose outer periphery is crimped. In addition, it is preferable to set the thickness of the resonator 60 to two to three times the thickness of the diaphragm 50.

The terminal 70 is a component that receives power from an external power source, is attached to the housing 10 with a metal rivet 73 via an insulator 71, and is connected to the coil 31.

The automobile alarm sound generating device 100 configured as above is manufactured as follows, as shown in FIG. 3. First, the core 20, the bobbin 30 around which the coil 31 on which the core 20 is arranged is wound, and the armature 40 arranged opposite the core 20 are set in the housing 10. Next, the central hole 51 of the diaphragm 50 is fitted into the small diameter portion 43 at the top of the armature 40, and the outer periphery of the diaphragm 50 is crimped to the crimping edge portion 10c. Then, the core 20 and the housing 10 are attached to the lower jig 95. The central hole 61 of the resonance plate 60 is fitted into the small diameter portion 43 at the top of the armature 40 so that it is positioned on the upper side of the diaphragm 50, the washer 91 is pressed down by the guide 92, and the armature 40 is pressed in until it comes into contact with the core 20, and the insert 96 is used to crush the small diameter portion 43 of the armature 40 and crimp it to fix it.

When the horn switch (not shown) installed inside the vehicle is turned on, the automobile alarm sound generating device 100 thus manufactured allows current from the vehicle's onboard power supply to flow from the terminal 70 → metal rivet 73 → coil 31 → movable contact support plate 35 → movable contact 35a → fixed contact 36a → fixed contact support plate 36 → metal rivet 38 → housing 10 → core 20 → mounting stay 80 → vehicle body.

When current flows through the coil 31, the core 20 becomes an electromagnet, and the core 20 attracts the armature 40, causing the core 20 and the armature 40 to collide. The vibrations caused by the collision are transmitted from the armature 40 to the resonance plate 60, vibrating the air and generating sound. At the same time, the armature 40 is attracted, causing the flange portion 42 of the armature 40 to press the movable contact support plate 35, disengaging the movable contact 35a from the fixed contact 36a. As a result, the current to the coil 31 is cut off, and the electromagnetic force of the core 20 disappears, so that the armature 40 returns to its original position due to the elastic force of the diaphragm 50, and the movable contact 35a and the fixed contact 36a return to a contact state again. This causes the current to flow again as described above. In this way, the collisions between the core 20 and the armature 40 are repeated, causing the diaphragm 50 and the resonance plate 60 to vibrate at a high frequency, thereby obtaining a constant frequency and sound pressure.

In the above-described embodiment of the automobile alarm sound generating device 100, the diameter of the resonator 60 is the same as or larger than the diameter of the diaphragm 50 after the periphery is crimped. Conventionally, the diaphragm 50 was fixed to the housing 10 by crimping the periphery of the diaphragm 50 while the diaphragm 50 and the resonator 60 were crimped to the armature 40. Therefore, if the diameter of the resonator 60 was not smaller than the diameter of the diaphragm 50, the resonator 60 would get in the way and the periphery of the diaphragm 50 could not be crimped. However, in the present invention, by adopting a manufacturing method in which the resonator 60 is fixed to the armature 40 after the periphery of the diaphragm 50 is crimped, the diameter of the resonator 60 is no longer restricted by the diameter of the diaphragm 50, so that the resonator 60 has a diameter larger than that of the diaphragm 50. This allows a wider range of diameters to be selected for the resonator 60, allowing for more extensive sound pressure adjustment. Also, by making the diameter of the resonator 60 larger than that of the diaphragm 50, the resonator 60 can cover the entire diaphragm 50. Therefore, the resonator 60, which is generally made thicker than the diaphragm 50, can receive chipping (flying stones) during driving, reducing the possibility of the diaphragm 50 being damaged. Furthermore, since the resonator 60 covers and hides the diaphragm 50, it is possible to eliminate the need to paint the diaphragm 50 black, which is usually done to ensure its aesthetic appearance.

As shown in the above embodiment, the device can be used industrially as an alarm sound generator for automobiles.

10...Housing, 100...Automobile alarm sound generator, 10a...Lower bottomed cylindrical portion, 10b...Upper cylindrical portion, 10c...Crimping edge portion, 20...Core, 30...Bobbin, 31...Coil, 35...Moving contact support plate, 35a...Moving contact, 36...Fixed contact support plate, 36a...Fixed contact, 37...Insulator, 38...Metal rivet, 40...Armature, 41...Cylindrical portion, 42...Flange portion, 43...Small diameter portion, 50...Vibration plate, 51...Center hole portion, 60...Resonating plate, 61...Center hole portion, 70...Terminal, 71...Insulator, 73...Metal rivet, 80...Mounting stay, 81...Bolt, 91...Washer, 92...Guide, 95...Jig, 96...Insulator

JP 2013-61448 A

Claims (3)

Housing and
a core fixed to the center of a bottom surface of the housing;
a bobbin on which the core is disposed and on which a coil is wound;
an armature disposed opposite the core;
a diaphragm and a resonator plate fixed to the armature by crimping;
A terminal to which power is supplied;
Equipped with
13. An alarm sound generating device for an automobile, comprising: a resonator having a diameter equal to or larger than a diameter of the diaphragm; The automobile alarm sound generating device according to claim 1, characterized in that the thickness of the resonator is two to three times the thickness of the diaphragm. 2. A method for producing an automobile alarm sound generating device according to claim 1, comprising the steps of:
(1) A setting step of setting a core, a bobbin around which a coil is wound and on which the core is placed, and an armature disposed opposite the core, in a housing.
(2) An outer periphery crimping process in which the central hole of the diaphragm is fitted into the small diameter portion of the upper part of the armature and the outer periphery of the diaphragm is crimped to a crimping edge. (3) A jig attachment process in which the core and the housing are attached to a lower jig. (4) An armature crimping process in which the central hole of the resonator is fitted into the small diameter portion of the armature so that it is positioned on the upper side of the diaphragm, a washer is pressed down with a guide, and the armature is pressed into contact with the core, and an insert is used to crush the small diameter portion of the armature and crimp it.

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