JP2002297143A - Electric horn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric horn capable of effectively suppressing the tilt of a movable iron core. SOLUTION: In the electric horn wherein the movable iron core 15 is provided with a flange part 15b for pressing a movable contact supporting plate 17, and when the movable iron core 15 is attracted to a fixed iron core 22 by the electromagnetic force of a coil 14, the movable iron core 17a is separated from the fixed iron core by depressing the movable contact supporting plate 17 by the flange part 15b of the movable iron core 15 and an insulating ring body 15c, when the flange part 15b of the movable iron core 15 depresses the movable contact supporting plate 17, a dummy spring part (spring means) 13d generating elastic reactive force almost balancing with an elastic reactive force applied to the movable iron core from the movable contact supporting plate 17 is arranged on a part opposite to the movable contact supporting plate 17 with respect to the center axis A of the movable iron core 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric horn (horn) for vibrating a diaphragm by an electromagnet and relates to a structure for preventing a movable iron core from being tilted, which is suitable for a vehicle.

[0002]

2. Description of the Related Art In a conventional electric horn, a movable core is fixed to the center of a disk-shaped diaphragm, and when this movable core is attracted toward a fixed core by the electromagnetic force of a coil of an electromagnet, The movable contact support plate made of a spring material is pushed down by the movable iron core to separate the movable contact from the fixed contact, thereby cutting off the current to the coil. Then, the movable core returns to the original position by the elastic force of the diaphragm, the movable contact returns to the closed state with the fixed contact, and the coil is energized again, and the above operation is repeated.

[0003]

Since the suction surfaces of the movable iron core and the fixed iron core are located on the central axis of the disk-shaped diaphragm, the pressing portion of the movable contact support plate by the movable iron core is at the center. It has to be set at a position offset from the axis. As a result, when the movable core pushes down the movable contact support plate, the elastic reaction force of the movable contact support plate acts at a position offset from the center axis with respect to the movable core, and a phenomenon occurs in which the movable core tilts.

[0004] Due to the inclination of the movable core, the movable core comes into contact with the inner wall surface of the center hole of the coil bobbin, causing problems such as deterioration of the movement of the movable core.

[0005] In view of the above, it is an object of the present invention to provide an electric horn that can effectively suppress the inclination of a movable iron core.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, the movable iron core (15) is provided with pressing portions (15b, 15c) of the movable contact support plate (17), When the movable iron core (15) is attracted to the fixed iron core (22) by the electromagnetic force of (14), the movable iron core (1)
5) In the electric horn, in which the movable contact support plate (17) is pressed by the pressing portions (15b, 15c) to separate the movable contact (17a) from the fixed contact (18a), the movable iron core (15) is pressed. When the movable contact support plate (17) is pressed by the portions (15b, 15c), the movable contact support plate (1) is pressed.
7) Spring means (13d, 17d) for generating an elastic reaction force substantially balanced with respect to the elastic reaction force applied to the movable iron core (15) with respect to the center axis of the movable iron core (15). .

As a result, the elastic reaction force from the movable contact support plate (17) and the elastic reaction force from the spring means (13d, 17d) are almost balanced and cancel each other.
When 5) presses the movable contact support plate (17), no biased force acts on the center axis (A) of the movable core (15), and the tilt of the movable core (15) can be effectively suppressed. . Therefore, it is possible to solve the problem that the movable core (15) comes into contact with the inner wall surface of the center hole of the coil bobbin (13) due to the inclination of the movable core (15).

[0008] As in the second aspect of the present invention, the first aspect
In the above, if the spring means (13d) is integrally formed with the resin bobbin (13) around which the coil (14) is wound, the spring means (13d) can be integrated with the bobbin (13), and the number of parts does not increase. This is advantageous for reducing the number of assembling steps.

According to the third aspect of the present invention, as in the first aspect,
, The spring means (17d) is connected to the movable contact support plate (1).
By integrally forming 7), the spring means (17d) can be integrated with the movable contact support plate (17), and the number of parts does not increase, which is advantageous in reducing the number of assembly steps.

In the invention according to claim 4, the movable iron core (1
5) Pressing portions (15b, 15) of the movable contact support plate (17)
c), when the movable iron core (15) is attracted to the fixed iron core (22) by the electromagnetic force of the coil (14), the movable contact support plate (15) is pressed by the pressing portions (15b, 15c) of the movable iron core (15). 17), the movable contact (17a) is separated from the fixed contact (18a) by an electric horn, and the center of gravity of the movable core (15) is higher than the center axis of the movable core (15). 17) The movable core (15) is formed in a shape offset to the side.

Thus, the load caused by the center of gravity offset toward the movable contact support plate (17) and the movable contact support plate (1)
Since the elastic reaction force from (7) is almost balanced and canceled, when the movable core (15) presses the movable contact support plate (17), the movable core (15) is biased with respect to the center axis (A) of the movable core (15). As a result, the inclination of the movable iron core (15) can be effectively suppressed, and the same effect as in the first aspect can be exhibited.

According to a fifth aspect of the present invention, in the fourth aspect, only the side of the outer peripheral surface of the movable iron core (15) facing the both contact support plates (17, 18) in the circumferential direction is radially outward. An eccentric weight portion (15d) protruding is formed.

According to this, the movable core (15) is formed by the eccentric weight portion (15d) formed on the movable core (15).
Is offset toward the movable contact support plate (17) with respect to the center axis of the movable iron core (15), and the effect of preventing the movable iron core (15) from tilting can be exhibited well.

The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiments described later.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) The first embodiment relates to an electric horn for a vehicle, and is shown in FIGS.
In the figure, reference numeral 10 denotes a horn housing, and a diaphragm 11
For accommodating the electromagnet 12 that vibrates. In addition,
FIG. 1 is a plan view showing a state in which the diaphragm 11 is removed. The horn housing 10 and the diaphragm 11 are
In order to form a part of the magnetic circuit of No. 2, a plate made of an iron-based magnetic material is press-formed into a concave shape.

The electromagnet 12 is provided with a coil 14 wound around a bobbin 13 made of resin.
The lower part of the movable core 15 formed in a columnar shape is disposed in the center hole of the movable core. The central portions of the diaphragm 11 and the resonance plate 16 are caulked and fixed to the small-diameter portion 15a above the movable iron core 15. The outer peripheral end 11a of the diaphragm 11 is fixedly wound around a flange 10a at the outer peripheral end of the horn housing 10 over the entire periphery.

Two protrusions 13b and 13c protrude radially outward from the upper flange 13a of the bobbin 13. On the concave intermediate flat portion 10b of the horn housing 10, one protruding portion 13b of the bobbin 13, a movable contact support plate 17 made of a metal spring material, a fixed contact support plate 18 made of an iron-based conductive metal, and both contacts A resin insulating ring body 19 (FIG. 3) interposed between the support plates 17 and 18 is laminated and caulked and fixed by a metal rivet 20.

The movable contact support plate 17 has a movable contact 17a.
The fixed contacts 18a are fixed to the fixed contact support plate 18, respectively. The movable contact 17a is a normally-closed contact that is pressed against the fixed contact 18a by the spring force of the movable contact support plate 17 during normal times (when the coil 14 is not energized).

A ring-shaped flange portion 15b protruding radially outward is formed on the outer peripheral surface of the columnar movable core 15, and a resin insulating material is provided on the lower surface side of the flange portion 15b of the movable core 15. The ring body 15c is press-fitted and fixed. The flange portion 15b and the insulating ring body 15c
End 17 of movable contact support plate 17 near the center of horn
b (FIG. 1) is configured to press downward.

Here, the fixed contact support plate 18 is
5 moves up and down, the flange 15 of the movable iron core 15
In order to avoid interference with the insulating ring member 15c and the insulating ring member 15c, an arc-shaped relief portion 18b along the outer peripheral surface of the flange portion 15b and the insulating ring member 15c is formed at a position on the movable iron core 15 side. If an electric insulator is arranged on the movable contact support plate 17 side, the insulating ring body 15c on the movable iron core 15 side can be eliminated.

The bobbin 13 is made of an elastic resin material (eg, nylon).
A dummy spring plate portion 13d is integrally formed with the upper flange portion 13a. As shown in FIG. 1, the dummy spring plate portion 13 d moves the movable contact support plate 1 with respect to the center axis A of the movable iron core 15.
7 and the movable contact support plate 17
Thus, an elastic reaction force substantially balanced with an elastic reaction force applied to the movable iron core 15 is formed.

In this example, as shown in FIG. 2, the dummy spring plate portion 13d is positioned above the upper flange portion 13a (movable iron core 15).
The movable iron core 15 is provided with a circular protrusion 13e at the center of the curved shape. When the insulating ring 15c of the movable core 15 presses the end 17b of the movable contact support plate 17, the dummy spring plate 13d also simultaneously
The dummy spring plate portion 13d is designed so as to be pressed by 5c and to generate an elastic reaction force substantially balanced with the movable contact support plate 17. The dummy spring plate 13d constitutes the spring means of the first aspect.

The other protruding portion 13c of the bobbin 13 is fixed to the intermediate flat portion 10b of the horn housing 10 by a metal rivet 21. The metal rivet 21 is electrically insulated from the horn housing 10, and the terminal wire 14 a at one end of the coil 14 is electrically connected to the metal rivet 21. Horn housing 10
A connector (not shown) is fixed to the outside of the terminal. A terminal piece of this end of the coil 14 is attached to a terminal piece of the connector.
Are electrically connected via the rivets 21.

The terminal wire 14b at the other end of the coil 14 is electrically connected to the movable contact support plate 17. The fixed contact support plate 18 is electrically connected to the horn housing 10 via a metal rivet 20.
Is grounded to the vehicle body via a mounting stay (not shown) fixed to the bottom surface portion 10c of the vehicle.

A cylindrical fixed iron core 22 is fixed to the center of the bottom surface 10c of the horn housing 10 by means such as screwing. The fixed iron core 22 is a horn housing 10
At the center of the bottom surface 10c of the movable iron core 15 with a predetermined suction gap interposed therebetween.

Next, the operation of the electric horn according to the present embodiment will be described. When a horn switch (not shown) is turned on, the current from the vehicle-mounted power supply is supplied to the terminal strip of the connector section (not shown) → rivet 21 → electromagnetic coil 14 → movable contact support plate 17 → movable contact 17 a → fixed contact 18 a → fixed contact support plate 18 → rivet 20 → horn housing 10
→ Mounting stay (not shown) → Flow through the body (ground).

As a result, the electromagnetic force of the electromagnetic coil 14 acts on the suction gap between the movable core 15 and the fixed core 22, and the movable core 15 is attracted to the fixed core 22. Due to the displacement of the movable core 15, the insulating ring 15c of the movable core 15 presses the end portion 17b of the movable contact support plate 17 to separate the movable contact 17a from the fixed contact 18a. As a result, the power supply to the electromagnetic coil 14 is cut off, and the electromagnetic force is eliminated, so that the movable iron core 15 returns to the original position by the elastic reaction force of the diaphragm 11.

Thus, the movable contact 17a and the fixed contact 1
The closed state with 8a is restored. In this way, the power supply to the electromagnetic coil 14 is interrupted, so that the diaphragm 11
In addition, the resonance plate 16 vibrates at a high frequency and emits a warning sound.

When the movable iron core 15 is attracted to the fixed iron core 22, the insulating ring 15c of the movable iron core 15 is removed.
Presses the end portion 17b of the movable contact support plate 17, and at the same time, the insulating ring body 15c of the movable iron core 15 is formed integrally with the upper flange portion 13a of the bobbin 13 by a dummy spring plate portion 13d.
Also press. Here, the dummy spring plate 13 d is disposed at a symmetrical position on the opposite side to the movable contact support plate 17 with respect to the center axis A of the movable core 15, and an elastic reaction force applied to the movable core 15 from the movable contact support plate 17 is reduced. Generates a substantially balanced elastic reaction force.

Therefore, when the movable iron core 15 is attracted to the fixed iron core 22, the movable iron core 15 is moved from the movable contact support plate 17 and the dummy spring plate portion 13d with respect to the center axis A thereof in a substantially symmetrical elastic reaction force. And the movable iron core 15
Can be prevented from tilting. (Second Embodiment) In the first embodiment, the dummy spring plate 13d is formed integrally with the bobbin 13 made of resin. However, in the second embodiment, as shown in FIG. Is integrally formed with a dummy spring plate portion 17c.

FIG. 4 shows a second embodiment. In the movable contact support plate 17, an elongated plate-shaped portion 17 'is an original support plate portion, and a portion of the movable contact support plate 17 near the center of the horn in its longitudinal direction. The movable contact 17a is fixed to the rivet 20, and an insertion hole 17c for the rivet 20 is provided in the other end on the horn outer peripheral side in the longitudinal direction.

Further, the movable iron core 1 is mounted on the movable contact support plate 17.
The dummy spring plate portion 17d is arranged substantially symmetrically on the side opposite to the original support plate portion 17 'with respect to the center axis A of the fifth unit 5 so that the original support plate portion 17' and the dummy spring plate portion 17d The spaces are integrally connected by an arc-shaped connecting portion 17e.
Therefore, the movable contact support plate 17 according to the second embodiment includes the original support plate portion 17 ′, the dummy spring plate portion 17 d, and the connection portion 17.
e is integrally formed with a metal spring material. The dummy spring plate portion 17d constitutes the spring means of the first aspect.

According to the second embodiment, when the movable iron core 15 is attracted to the fixed iron core 22, the insulating ring 15c of the movable iron core 15 becomes the end 17b of the original support plate portion 17 'of the movable contact support plate 17. When pressing the dummy spring plate portion 1
7d is also pressed at the same time. Here, the dummy spring plate portion 17d
Is the movable contact support plate 1 with respect to the center axis A of the movable iron core 15.
7 are arranged substantially symmetrically on the side opposite to the original support plate portion 17 ′, and the movable core 1 is separated from the original support plate portion 17 ′.
5 generates an elastic reaction force substantially balanced with the elastic reaction force applied to the elastic member 5.

Therefore, when the movable iron core 15 is attracted to the fixed iron core 22, the movable iron core 15 is substantially symmetrical with respect to the central axis A from the original support plate portion 17 'and the dummy spring plate portion 17d. A reaction force is received, and the tilt of the movable iron core 15 can be prevented.

In the first and second embodiments, the dummy spring plate portions 13d and 17d which generate an elastic reaction force substantially balanced with the elastic reaction force of the movable contact support plate 17 (17 ') are connected to the movable iron core 15. The movable contact support plate 17 (1
7 ′), only one place is disposed on the opposite side to the dummy spring plate portions 13d and 17d.
, The dummy spring plate portions 13d, 17d are arranged at a plurality of locations on the side opposite to the movable contact support plate 17 (17 ').
And the elastic reaction force of the movable contact support plate 17 (17 ') may be substantially balanced. In this case, the positions of the dummy spring plate portions 13d and 17d may be shifted from the center axis A, not at a position completely opposite to the movable contact support plate 17 (17 '). (Third Embodiment) In the first and second embodiments described above, the dummy spring plate portions 13d, 17d that generate an elastic reaction force substantially balanced with the elastic reaction force of the movable contact support plate 17 (17 ') are replaced by the bobbin 13 or the bobbin 13. Although it is integrally formed with the movable contact support plate 17, in the third embodiment, the dummy spring plate portions 13d, 17d
In this configuration, the movable iron core 15 is prevented from being tilted by a configuration having no.

FIGS. 5 and 6 show a third embodiment, and FIG. 5 is a plan view similar to FIG. The movable iron core 15 is formed in a shape in which the center of gravity of the movable iron core 15 is offset from the center axis A of the movable iron core 15 toward both contact support plates 17 and 18. More specifically, in the first and second embodiments, the movable iron core 15 is provided with a ring-shaped flange portion 15b serving as a pressing portion of the movable contact support plate 17, but in the third embodiment, the ring-shaped flange portion 15b is provided. Is abolished, and instead, a protruding portion 15d that protrudes radially outward is formed only on the side of the outer peripheral surface of the movable iron core 15 that faces the contact support plates 17 and 18 in the circumferential direction. ing.

By forming the protruding portion 15d protruding only to the two contact support plates 17 and 18 in this manner, the center of gravity of the movable iron core 15 is closer to the both contact support plates 17 and 18 than the center axis A of the movable iron core 15. The shape is offset to That is, the protrusion 15d functions as an eccentric weight for moving the center of gravity of the movable iron core 15.

In the third embodiment, the insulating ring 15c has an elliptical shape overlapping the upper end 17b of the movable contact support plate 17 as shown by a broken line in FIG. It is formed in. In addition, the protrusion 15d
Since the distance between the movable core 15 and the fixed contact support plate 18 (see FIG. 6) is larger than the suction stroke of the movable core 15, the protrusion 15d does not press the fixed contact support plate 18 when the movable core 15 is attracted.

According to the third embodiment, when the movable iron core 15 is attracted, the elastic reaction force applied to the movable iron core 15 from the movable contact support plate 17 and the projecting portion 15d of the movable iron core 15 cause both contact support plates 17 and 18 to move. By substantially balancing the load due to the offset center of gravity, the tilt of the movable iron core 15 can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of an electric horn according to a first embodiment of the present invention with a diaphragm portion removed.

FIG. 2 is a partially cutaway front view of the electric horn according to the first embodiment.

FIG. 3 is a partially cutaway rear view of the electric horn according to the first embodiment.

4A is a plan view of a movable contact support plate according to a second embodiment, and FIG. 4B is a cross-sectional view of FIG.

FIG. 5 is a plan view of the electric horn of the third embodiment with a diaphragm portion removed.

FIG. 6 is a partially cutaway front view of an electric horn according to a third embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Horn housing, 11 ... Diaphragm, 12 ... Electromagnet, 13 ... Bobbin, 13d ... Dummy spring plate part (spring means), 14 ... Coil, 15 ... Movable iron core, 15b ... Flange part (pressing part), 15c ... Insulation Ring body, 15d Projecting portion (eccentric weight portion), 17 Moving contact support plate, 17a
... Movable contact, 17d ... Dummy spring plate (spring means), 1
8: fixed contact support plate, 18a: fixed contact, 22: fixed iron core.

Claims (5)

[Claims] 1. A movable core (15) coupled to a diaphragm (11), and a fixed core (2) opposed to the movable core (15).
2), a coil (14) for attracting the movable core (15) to the fixed core (22), a fixed contact (18a) provided in an energizing circuit of the coil (14), and a fixed contact (18a). ) Fixed contact support plate (1)
8) a normally closed movable contact (17a) normally closed to the fixed contact (18a); and a movable contact support plate (17) made of a spring material and supporting the movable contact (17a). The movable iron core (15) is provided with pressing portions (15b, 15c) of the movable contact support plate (17), and the coil (14)
When the movable iron core (15) is attracted to the fixed iron core (22) by the electromagnetic force, the movable contact support plate (17) is pressed by the pressing portions (15b, 15c) of the movable iron core (15). Then, in the electric horn for separating the movable contact (17a) from the fixed contact (18a), the movable contact support plate (17) is pressed by the pressing portions (15b, 15c) of the movable core (15). At this time, a spring means (1) for generating an elastic reaction force substantially balanced with respect to the elastic reaction force applied from the movable contact support plate (17) to the movable core (15) with reference to the center axis of the movable core (15).
An electric horn comprising 3d, 17d). 2. The coil according to claim 1, wherein said coil is wound around a bobbin made of resin, and said spring means is integrally formed on said bobbin. The described electric horn. 3. An electric horn according to claim 1, wherein said spring means (17d) is formed integrally with said movable contact support plate (17). 4. A movable core (15) coupled to a diaphragm (11), and a fixed core (2) disposed opposite to the movable core (15).
2), a coil (14) for attracting the movable core (15) to the fixed core (22), a fixed contact (18a) provided in an energizing circuit of the coil (14), and a fixed contact (18a). ) Fixed contact support plate (1)
8) a normally closed movable contact (17a) normally closed to the fixed contact (18a); and a movable contact support plate (17) made of a spring material and supporting the movable contact (17a). The movable core (15) is provided with a pressing portion (15c) of the movable contact support plate (17), and the movable core (15) is attached to the fixed core (22) by the electromagnetic force of the coil (14). When being sucked, the pressing portion (1) of the movable iron core (15)
By pressing the movable contact support plate (17) by 5c),
An electric horn for separating the movable contact (17a) from the fixed contact (18a), wherein the center of gravity of the movable core (15) is higher than the center axis of the movable core (15). 18) An electric horn characterized in that the movable iron core (15) is formed in a shape offset to the side. 5. An eccentric weight portion (15d) protruding radially outward only on a side facing the contact support plates (17, 18) in a circumferential direction of an outer peripheral surface of the movable iron core (15).
The electric horn according to claim 4, wherein