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JP2004253901

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DESCRIPTION JP2004253901
PROBLEM TO BE SOLVED: To provide an electromagnetic horn which is easy to process parts
and which does not require special waterproofing measures at low cost without requiring a screw
portion of a core attachment portion for the purpose of air gap adjustment, and easy to adjust an
air gap. A method of manufacturing an electromagnetic horn. SOLUTION: A protrusion is
provided at an eccentric position on the opposite side of the core and the armature, and an
inclined surface is provided on the other side, and when the armature is rotated with respect to
the core, The air gap between the projection and the inclined surface is changed, and the
armature is pressed toward the core by the adjusting tool, and the air gap is measured from the
amount of movement of the armature at the time of contact. I made it to adjust. [Selected figure]
Figure 3
Electromagnetic horn and method of manufacturing electromagnetic horn
[0001] The present invention relates to an electromagnetic horn for use in automobiles and the
like, and in particular, the configuration and electromagnetic of the electromagnetic horn in
which the air gap adjustment between a fixed core and a movable armature is easy. The present
invention relates to a method of manufacturing a horn. [0002] As a general configuration of an
electromagnetic horn used for an automobile etc., for example, the one described in Patent
Document 1 is known. As shown in FIG. 5, the electromagnetic horn described in Patent
Document 1 has a substantially bowl-shaped housing 1 and an electromagnetic coil 2 in which an
electric wire is wound around a hollow coil bobbin 2 a is disposed at the bottom of the housing 1.
It is set up. A core 3 provided with a male screw 3a is adjustably fixed to a female screw
cylindrical portion 1a formed on the bottom surface of the housing 1, and a main portion of the
core 3 is disposed in a hollow portion of the coil bobbin 2a. In addition, a thin plate-like
diaphragm 5 to which an armature 4 is attached at the center is disposed at the front opening of
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the housing 1 and a circumferential portion of the diaphragm 5 is crimped to the periphery of
the opening of the housing 1 . The lower surface of the main body 4a of the armature 4 is
opposed to the upper surface of the core 3 with a slight gap G (air gap). Reference numeral 6
denotes a disk-shaped resonance plate disposed on the upper surface of the diaphragm 5, and
the resonance plate 6 is attached to the extension portion 4b of the armature 4 at an appropriate
distance from the diaphragm 5. In the electromagnetic horn configured as described above, when
an intermittent current is supplied to the electromagnetic coil 2 via a current interrupter (not
shown in FIG. 5), the magnetic force generated in the electromagnetic coil 2 The armature 4 is
intermittently sucked in the direction of the core 3. Then, due to the elastic force of the
diaphragm 5 and the magnetic force, the armature 4 and the core 3 repeatedly collide and
separate, and by this operation, the diaphragm 5 vibrates and the resonance plate resonates to
emit an alarm sound. ing. In addition, a slight gap G (air gap) between the core 3 and the
armature 4 is extremely important in order to stably generate the alarm sound by the above
operation. For this reason, in the electromagnetic horn of the above configuration, the gap G (the
gap G (FIG. 6) is adjusted by utilizing the screwing between the male screw 3a of the core 3 and
the female screw cylindrical portion 1a formed on the bottom of the housing 1 after assembly.
Air gap is to be adjusted. Patent Document 1: Japanese Patent No. 3205256 Figure 4 Problem to
be solved by the invention In the conventional electromagnetic horn described in Patent
Document 1, the gap G (air gap) is assembled Although it can be easily adjusted using the
screwing structure of the core 3 later, it is necessary to provide the male screw 3a on the core 3
and the female screw cylindrical portion 1a on the bottom surface of the housing 1. There was a
problem.
In addition, rainwater easily infiltrates along the screw connection between the male screw 3a of
the core 3 and the female screw cylindrical portion 1a of the housing 1, and it has been
necessary to apply a waterproof resin or the like. Furthermore, adjustment of the gap G (air gap)
in the electromagnetic horn of the above configuration is performed by manually rotating the
core 3 in a state where the electromagnetic horn is operated, and automation is difficult and
many steps are required for adjustment. The problem was that it took The present invention has
been made to solve the above-mentioned problems, and an object of the present invention is to
inexpensively provide an electromagnetic horn which is easy to process parts and which does not
require special waterproofing measures. It is an object of the present invention to provide a
method of manufacturing an electromagnetic horn in which adjustment of the air gap is easy.
SUMMARY OF THE INVENTION In order to solve the above problems, the invention of claim 1
relates to a housing in which an electromagnetic coil and a core are disposed, and a housing An
opening is provided with an armature having a diaphragm and a resonance plate attached to the
opening, an air gap is provided between the core and the armature, and when the
electromagnetic coil is supplied with an intermittent current, the core and the armature collide (
In the electromagnetic horn where the alarm sound is emitted by repeatedly pulling away and
releasing, a protrusion is provided at an eccentric position on the opposite side of the core and
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the armature, and an inclined surface is provided on the other side. The axial rotation of the
armature is configured to change an air gap between the core and the armature. For this reason,
it is not necessary to use a conventional screw for attaching a core, the parts can be easily
processed, and no special measures are required to prevent the entry of rainwater from the
screw. The invention of claim 2 is characterized in that the above-mentioned projection is formed
in a substantially conical shape, so that the shape and processing of parts are easy and practical.
According to the invention of claim 3, the diaphragm on which the armature and the resonance
plate are attached is mounted on the opening of the housing in which the electromagnetic coil
and the core are disposed, and the armature is directed in the core direction by the adjuster. In
the method of manufacturing an electromagnetic horn which measures the air gap from the
amount of movement of the armature at the time of pressing, the projection is provided at an
eccentric position on the opposite side of the core and the armature, An inclined surface is
provided on the side of the housing, and the air gap between the core and the armature is
adjusted by rotating the diaphragm on which the armature and the resonance plate are attached
relative to the housing. It is.
According to the invention of claim 3, the air gap between the core and the armature can be
easily and easily adjusted by rotating the diaphragm on which the armature and the resonance
plate are attached relative to the housing. And improve productivity by automation. Hereinafter,
an embodiment of the present invention will be described based on the drawings. In order to
make the description easy to understand, the same components as those in the above-described
conventional example will be described with the same reference numerals. FIG. 1 is a crosssectional view showing the entire configuration of an electromagnetic horn according to the
present invention. Reference numeral 1 denotes a housing having a substantially bowl-like shape
and an opening 10 provided at the upper side, and a hole 11 is provided at the bottom of the
housing 1. The electromagnetic coil 2 has a configuration in which an electric wire is wound
around a coil bobbin 2a having a hollow portion 2b, the electromagnetic coil 2 is disposed at the
bottom of the housing 1, and the hollow portion 2b of the coil bobbin 2a is a hole 11 of the
housing 1. It overlaps with the Reference numeral 3 denotes a cylindrical core made of a
magnetic material such as iron. The core 3 is disposed in the hollow portion 2b of the coil bobbin
2a, and caulked and fixed to the periphery of the hole 11 of the housing 1 by a caulking portion
3b. The extended portion 3a of the core 3 is protruded to the lower outside of the housing 1
through the hole 11 of the housing 1, and a plate-like holder 20 is attached using an external
screw and a nut 21 provided in the extended portion 3a. There is. An armature 4 comprises a
cylindrical main body 4 a made of a magnetic material such as iron and an extension 4 b
projecting upward, and the main body 4 a has substantially the same diameter as the core 3.
Also, the lower surface of the main body 4a is disposed to face the upper surface of the core 3
with an air gap G (appropriately spaced). Although the air gap G described above varies
depending on the design conditions of the vibration system including the diaphragm 5 and the
like described later, the setting of the electromagnetic horn for a general automobile is roughly
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1.0 to 1.2 mm empirically It is a suitable value. Further, in order to stably generate the alarm
sound, it is general to adjust the air gap G in a range of about 0.1 mm. Reference numeral 5
denotes a disk-shaped diaphragm formed of a thin plate of iron or the like, and a circumferential
portion of the diaphragm 5 is caulked and fixed to a peripheral portion of the opening 10 of the
housing 1 using a ring member 22 . In addition, as shown in FIG. 2 in an enlarged manner,
between the circumferential portion of the diaphragm 5 and the peripheral portion of the
opening 10 of the housing 1, a ring-shaped thin plate in which a paper material is impregnated
with an oily substance. A gasket 22a is interposed.
The extension portion 4b of the armature 4 is inserted through the central portion of the
diaphragm 5, and the diaphragm 5 and the diaphragm 24 are interposed using a plurality of
washers 23 and a male screw provided on the nut 24 and the extension portion 4b. The
resonance plate 6 and the resonance plate 6 are fixed together at an appropriate distance.
Therefore, when an intermittent current is supplied to the electromagnetic coil 2 via a current
interrupter (not shown in FIG. 1), the armature 4 intermittently draws in the direction of the core
3 by the magnetic force generated in the electromagnetic coil 2 Be done. Then, due to the elastic
force of the diaphragm 5 and the magnetic force, the armature 4 and the core 3 repeatedly
collide and separate, and by this operation, the diaphragm 5 vibrates and the resonance plate
resonates to emit an alarm sound. ing. (Known Operation) Next, with reference to FIG. 3, the
detailed shape of the armature 4 and the core 3 and the combination of the facing portions will
be described. In addition, FIG. 3 is principle explanatory drawing which exaggerated and showed
the one part shape with expansion. The lower surface portion 40 of the main body 4 a of the
armature 4 is provided with a conical portion 40 a having a vertex P at a position eccentric to the
center line X. The conical portion 40 a has a height H 1 of about 0.1 mm, and is set so as to
project slightly downward from the lower surface portion 40. The upper surface portion 30 of
the core 3 has a shape obtained by obliquely cutting a cylinder, and the oblique height H2 is also
set to about 0.1 mm. Therefore, when the armature 4 is rotated in the direction of arrow A in FIG.
3, the apex P of the conical portion 40 a changes to the position indicated by P ′. Then, the air
gap G between the core 3 and the armature 4 at first is set to change to G '. That is, in the
electromagnetic horn of the present invention, when the diaphragm 5 is rotated before caulking
fixation of the diaphragm 5 by the ring member 22 (temporary assembly state in the middle of
assembly shown in FIG. 1), the core 3 and the armature 4 It is possible to easily change the air
gap G between them. Subsequently, an example of a specific adjustment method of the air gap G
described above will be described with reference to FIG. 4 and the principle of the procedure
thereof. FIG. 4 is a side view showing the electromagnetic horn of the present invention shown in
FIG. 1 in the process of assembly, in which necessary parts such as the electromagnetic coil 2 are
incorporated in the housing 1. Further, the diaphragm 5 and the resonance plate 6 are attached
to the armature 4 at predetermined positions, and the diaphragm 5 is mounted so as to close the
opening 10 of the housing 1 with the gasket 22a interposed. That is, in the state shown in FIG. 4,
the ring member 22 is not crimped (finally assembled) as compared to the state in which the
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assembly shown in FIG. 1 is completed.
The reference numeral 31 denotes a holder for holding the housing 1 at a predetermined
position, and the reference numeral 32 denotes an adjuster capable of pressing the upper end of
the extension portion 4b of the armature 4 downward while measuring and adjusting the amount
of movement. Reference numeral 33 denotes a DC power supply, the anode of which is
connected to the diaphragm 5 via the current detector 34, and the cathode of which is connected
to the housing 1. Next, the adjustment procedure will be described. First, the adjuster 32 is
moved downward (in the direction indicated by the arrow B in FIG. 4) from the state shown in
FIG. 4 to bring the lower surface of the adjuster 32 into contact with the upper end of the
extension 4b of the armature 4 As a reference point. From this state, when the adjustment tool
32 is further moved downward, the diaphragm elastically deforms and the armature 4 moves
downward, and after the movement corresponding to the air gap G at that time, the armature 4
and the core 3 contact each other. Contact. Then, a current flows in the path of the diaphragm 5,
the armature 4, the core 3 and the housing 1, and the current detector 34 detects the current,
that is, the contact between the armature 4 and the core 3 is detected. Here, since a gasket 22a
in which an oil-based material is impregnated into a paper material is interposed between the
diaphragm 5 and the housing 1, this acts as electrical insulation, and from the diaphragm 5 to
the housing 1 No current flows directly to the Although the drive and control means of the
adjustment tool 32 are omitted and the current detector 34 is illustrated in FIG. 4 in order to
explain the principle in an easy-to-understand manner, each signal may be・ Use a computerbased adjustment device. By the above operation, the air gap G at that time can be easily and
easily measured, and if this is different from the design target value, the armature 4, the
diaphragm 5, the resonance plate 6 and the like are integrated. Rotate by a fixed angle. Then, the
air gap G changes according to the principle shown in FIG. 3 according to the rotation angle. By
repeating the above operation in this state, the air gap G can be easily and easily adjusted to the
target value. Furthermore, by appropriately setting the eccentricity etc. of the conical portion 40a
shown in FIG. 3 beforehand, the rotation angle necessary for adjustment is calculated from the
difference between the measured value and the target value, and the adjustment is efficiently
performed. Is also possible. Next, after the above measurement and adjustment are completed,
the diaphragm 5 is crimped to the peripheral edge of the housing 1 using the ring member 22 to
complete the assembly of the electromagnetic horn having the predetermined air gap G.
Although one embodiment of the present invention shown in FIGS. 1 to 4 has been described
above, for example, when the gasket 22a in which an oily substance is impregnated into a paper
material is not adopted, an appropriate one may be used for the electromagnetic coil 2. By
applying an AC voltage and detecting a change in the impedance, a change such as detection of
contact between the armature 4 and the core 3 can be made.
In the above embodiments, although the electromagnetic horn in which the armature collides
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with the core has been described, the electromagnetic horn having a configuration in which the
armature is only attracted and separated but does not collide with the core, for example, the
housing of air vibration by the diaphragm The present invention is also applicable to a so-called
spiral horn having a structure in which resonance is performed using a spiral duct arranged so as
to cover. According to the present invention, the air gap can be easily and easily adjusted by
integrally rotating the armature 4, the diaphragm 5, the resonance plate 6 and the like by a
predetermined angle. In addition, it is easy and inexpensive to process and assemble parts, and it
is not necessary to apply special waterproofing measures to the screw connection portion of the
core as in the prior art, and is excellent in practicability. BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view showing an entire configuration of an electromagnetic horn
according to the present invention. FIG. 2 is an enlarged sectional view showing a mounting
portion of a housing 1 and a diaphragm 5 of the electromagnetic horn shown in FIG. 3 is a
principle explanatory view showing the shapes of a core 3 and an armature 4 of the
electromagnetic horn shown in FIG. 1; FIG. 4 is a side view showing the process of adjusting the
electromagnetic horn of the present invention shown in FIG. 1 during assembly. FIG. 5 is a crosssectional view showing the configuration of a conventional electromagnetic horn. [Description of
the code] 1 housing 2 electromagnetic coil 2a coil bobbin 3 core 30 upper surface 4 armature 40
lower surface 40a conical portion 5 diaphragm 6 resonance plate 22 ring member 22a gasket G
air gap P apex
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