JP2565313Y2 - Mounting structure of noise prevention element for vehicle horn - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a noise prevention element in a vehicle horn mounted on a vehicle such as an automobile or a motorcycle.

[0002]

2. Description of the Related Art Conventionally, in a vehicle horn of this type, a noise prevention element is electrically connected in parallel between a fixed contact and a movable contact in a horn for a vehicle. There is one that prevents the generation of electrical noise due to the arc discharge. For example, Japanese Utility Model Publication No. 59-28475 and Japanese Utility Model Publication No. 62-
No. 37275 is known. The former employs a capacitor as a noise prevention element, which is provided on the outside of the case.However, if efficient noise prevention is to be achieved by using a capacitor, a large-capacity one is absolutely necessary. Itself becomes large,
For this reason, when this is provided outside the case, it becomes an obstacle, and it is attempted to dispose it inside the case.However, it is necessary to secure a space for disposing the capacitor in the case itself. There is a problem that hinders. On the other hand, the latter is a device in which a resistance wire is wrapped around a fiber bundle as a noise preventing element to have flexibility, and this is bent in a substantially U shape and disposed in a case body. In this case, the noise prevention element is still large, and the noise prevention element itself is not supported by the case body side. Therefore, the noise prevention element vibrates. There is a problem that the prevention element needs to be supported on the case body side, the number of parts increases, and the assembling work becomes complicated.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made with the object of providing a mounting structure of a noise prevention element in a vehicle horn which can eliminate these disadvantages. Then, on the mounting part extending to one side from the coil bobbin around which the coil is wound,
In a vehicle horn in which a fixed contact plate and a movable contact plate provided with respective contacts are mounted in an insulated state, when electrically connecting a noise prevention element between the two contact plates in parallel, the noise prevention element is a varistor. On the other hand, an element holding portion having a substantially U-groove shape and a groove width set slightly smaller than the thickness of the varistor is integrally formed on the mounting portion so as to stand up integrally,
The varistor is configured to be pressed into and held by the element holding portion.

In the present invention, the noise preventing element is a small varistor, and the varistor can be easily supported on the case body side.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a horn for a vehicle, and a pole 3 is provided at a central portion of a case body 2 constituting the horn.
Are fixed integrally. On the other hand, reference numeral 4 denotes a coil bobbin formed of an insulating resin. A coil 5 for excitation is wound around a bobbin portion 4a formed on the coil bobbin 4. The coil bobbin 4 Is fixed to the case body 2 so as to be centered, and the fixing plate 6 is riveted and fixed to the case body 2 so as to be supported by the case body 2.

On the other hand, the bobbin portion 4a of the coil bobbin 4
The mounting portion 4c is extended toward one side on the front side flange 4b that constitutes the above. And this mounting part 4c
Are provided with terminal holes 4d, 4e through which power supply terminal terminals 7, 8 are attached. From one of the terminal terminals 7, from the mounting portion 4 c side, the base end of the movable contact plate 9 provided with the contact 9 a at the tip, the insulating material 10,
A fixed contact plate 11 provided with a contact 11a at an intermediate portion is penetrated in the order of the base end, and one end 5a of the coil 5 is elastic between the mounting portion 4c and the base end of the movable contact plate 9. The other end 5b is sandwiched between the mounting portion 4c and the head of the other terminal terminal 8, whereby the terminal 7, fixed contact plate 11, contact 11a, contact 11a, movable Contact plate 9, coil 5, terminal terminal 8
In that order. Reference numeral 4g denotes an upright wall provided on the mounting portion 4c to ensure insulation between the contact plates 9 and 11 assembled to the terminal terminal 7 and the case 2 of the coil terminal 5 and to position the contact plates 9 and 11. Is going.

Further, an element holding portion 4f having a substantially U-groove shape is formed upright toward the front surface side of the mounting portion 4c. A varistor 12 used as a noise prevention element is held in the element holding portion 4f. You. That is, the element holding portion 4f
The groove width A is set slightly smaller than the thickness B of the varistor 12 (A <B), and the varistor 12 is pressed and held in the element holding portion 4f. One of the pair of lead wires 12 a extending from the varistor 12 is connected to one end 5 a of the coil 5.
Is clamped between the mounting portion 4c to be clamped and the base end of the movable contact plate 9, and the other 12b is clamped between the standing wall 4g of the mounting portion 4c and the fixed contact plate 11. Thus, the varistor 12 is electrically connected in parallel between the two contact plates 9 and 11.

In the embodiment of the present invention constructed as described above, the generation of electrical noise due to the arc discharge generated between the contacts 9a and 11a during the audible alarm is ensured by the varistor 12, which is a noise prevention element. Will be prevented,
Since this varistor 12 itself is small, the case 2
The arrangement space secured inside the horn is small, which can contribute to the reduction in size and weight of the horn. However, the varistor 12 is further elastically pushed into the element holding portion 4f formed integrally with the coil bobbin 4. Is sandwiched between. As a result, the varistor 12 has a structure supported on the case body 2 side via the coil bobbin 4, and it is not necessary to support the varistor 12 on the case body side using a separate holding member to prevent inadvertent vibration. The number of points can be reduced, and the assembling work is also simplified.

In addition, the wiring work of the lead wires 12a and 12b extending from the varistor 12 does not require the work such as soldering, and is merely performed by arranging the lead wires 12a and 12b at the portion to be sandwiched as described above. Thereafter, automatic electrical connection is made based on the caulking and fixing of the terminal terminal 7, so that workability is improved.

[Effects of the Invention] Since the present invention is constructed as described above, the generation of electric noise due to the arc discharge generated at the time of alarm between the two contacts uses a varistor as a noise prevention element. Thus, it is surely prevented. In addition, since the varistor itself is small, the space required for disposing the varistor in the case body can be made small, thereby contributing to the reduction in size and weight of the horn. Since the varistor is elastically held by being pushed into a substantially U-groove-shaped element holding portion formed integrally with the coil bobbin, the varistor is supported on the case body side via the coil bobbin. Therefore, there is no need to use a separate holding member to prevent inadvertent vibrations, and it is not necessary to support the case body side, so that the number of parts can be reduced and the assembling work can be simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of a horn for a vehicle.

FIG. 2 is a plan view showing a state in which a vibration member such as a diaphragm is removed from a horn for a vehicle.

FIG. 3 is an enlarged side view in which a vibration member including a diaphragm and the like and a case body are removed from a horn for a vehicle, and a part thereof is cut away.

FIG. 4 is a plan view of a single coil bobbin.

FIG. 5 is a side view of a single coil bobbin.

FIG. 6 is a plan view of a varistor alone.

FIG. 7 is an enlarged sectional view showing a connection state that can be placed on a terminal terminal 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle horn 4 Coil bobbin 4c Mounting part 4f Element holding part 4g Upright wall 7 Terminal terminal 9 Movable contact plate 11 Fixed contact 12 Varistor

Claims (1)

(57) [Scope of request for utility model registration] 1. A vehicle horn in which a fixed contact plate provided with contacts and a movable contact plate are mounted in an insulated state on a mounting portion extending to one side from a coil bobbin on which a coil is wound. In electrically connecting the noise prevention element between the two contact plates in parallel, the noise prevention element is a varistor, while the mounting portion is substantially U-shaped and the groove width is slightly smaller than the thickness of the varistor. A mounting structure for a noise prevention element in a horn for a vehicle, wherein a set element holding portion is integrally formed upright, and a varistor is pressed into and held by the element holding portion.