JP2011248183A - Electric horn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric horn that is capable of preventing entry of water, dust, sand and the like from its vent hole without using any additional parts and is durable (free from clogging).SOLUTION: The electric horn is provided with a mounting stay 5 used for mounting the electric horn onto a vehicle and the like, with the mounting stay 5 having in the vicinity of its center a fixing part 5a that is fixed to the bottom back face of a housing 1 and in the vicinity of one of its ends a closing part 5b that closes a vent hole 1a open to the housing 1.

Description

  The present invention relates to an electric horn (alarm), and more particularly to an electric horn for direct current used for automobiles, motorcycles, snowmobiles, small ships, and the like.

  There are two types of electric horns: AC and DC. The AC horn is of a type in which a direct vibration system is directly excited by an AC power source such as a flywheel dynamo and has a simple structure without a contact intermittent mechanism. This AC horn has high durability and safety, but the sound pressure and timbre change depending on the speed and lacks the clarity of the sound compared to the DC one. It is only used as a simple horn for special vehicles.

  DC horns include flat, spiral, and trumpet types. As shown in FIG. 7, the flat type has an interrupter 53 having a core (fixed iron core) 51 a, a coil 51 b, a diaphragm 52, and contact points 53 a and 53 b that constitute an electromagnet 51 with respect to the housing 50. In addition, the stay 54 is attached. In this flat type, the vibration of the diaphragm 52 and the resonance plate 56 formed integrally with the diaphragm 52 are sounded by the impact of the movable core 55 and the core 51a (see, for example, Patent Document 1). The spiral type and the trumpet type have improved acoustic efficiency by providing a trumpet-shaped sound path and causing resonance radiation.

  By the way, since such a DC horn has an electrical contact and a movable part inside, it is necessary to protect against the intrusion of water and dust. For this reason, if the airtightness of the joint portion between the housing 50 and the diaphragm 52 is increased, the air pressure inside the horn (the space formed by the housing 50 and the diaphragm 52) increases or decreases during operation, so that the diaphragm 52 becomes difficult to vibrate. Also, water may be sucked into the horn from the gap due to the difference between the atmospheric pressure inside the horn and the outside air pressure, but once the water has entered the horn, it is difficult to escape. It can be a cause.

  Therefore, as shown in FIG. 7, a vent 50a is provided in the lower portion of the housing 50 where water can easily collect.

  Providing the air holes 50a solves the problem that the vibration plate 52 is difficult to vibrate and the problem that water that has entered is difficult to escape. However, water, dust, sand, etc. enter the horn from the air holes 50a. Often causes squeal.

  Therefore, as shown in FIG. 7, a porous film 57 is attached to a portion where the vent 50 a of the housing 50 is opened.

JP-A-6-43878

  As described above, the conventional direct current electric horn has a porous film attached to the vent hole of the housing. Therefore, the conventional electric horn has a problem in that it requires a separate part (porous membrane), increases the number of steps for attaching, and becomes expensive. In addition, the porous membrane is clogged with dust and muddy water, and has a problem that it is difficult for water that has entered the interior to escape. Furthermore, since the porous film was peeled off, the durability was poor.

  The present invention has been made in view of the problems of the above-described conventional electric horn, and can prevent water, dust, sand, etc. from entering through the vents without using separate components, and is durable. It is an object of the present invention to provide an electric horn having no clogging.

  The electric horn of the present invention made to solve the above-described problems includes a bottomed cylindrical housing, an electromagnet housed and fixed near the center of the housing, and the housing fixed to the outer peripheral edge of the housing. An electric plate, a movable iron core fixed near the center of the diaphragm and disposed opposite to the electromagnet, and an attachment stay fixed to the bottom of the housing and attached to a vehicle or the like. The mounting stay includes a fixing portion that is fixed to the back of the bottom of the housing near the center, and a closing portion that closes a vent hole that opens to the housing near one end. To do.

  Since it has a mounting stay that has a fixing part that is fixed to the back of the bottom of the housing near the center and a blocking part that closes the ventilation hole that opens in the housing near one end, the ventilation hole without using any additional parts Water, dust, sand and the like can be prevented from entering. When the horn is operated, the air pushed out from the vent hole pushes the closing portion of the mounting stay rearward, so that a gap is generated between the closing portion and the back surface of the housing. Therefore, when the horn is operated, air enters and exits from the vent hole through the gap between the blocking portion and the housing, and at the same time, water droplets in the housing are discharged to the outside through the gap. The stay is highly durable without clogging.

  In the electric horn, the housing may include a ring-shaped convex portion that protrudes outward from the vent hole.

  Since the ring-shaped convex portion comes into contact with the closing portion of the mounting stay, the air hole is closed with a small gap. Moreover, since the ring-shaped convex part protrudes outward (rearward) of the housing, it is suppressed that water droplets or the like flowing along the rear surface of the housing enter the inside of the housing. Furthermore, when the horn is operating, the air pushed out from the vent hole effectively acts on the blocking portion of the mounting stay and pushes the blocking portion away from the vent hole, so that air can easily enter and exit from the vent hole during horn operation. At the same time, water droplets in the housing are discharged to the outside.

  Since it has a mounting stay that has a fixing part that is fixed to the back of the bottom of the housing near the center and a blocking part that closes the ventilation hole that opens in the housing near one end, the ventilation hole without using any additional parts Water, dust, sand and the like can be prevented from entering. The stay is highly durable without clogging.

2 is a rear view of the electric horn according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view taken along line A1-A1 of FIG. It is the side view (a) and top view (b) of the attachment stay of FIG. It is a principal part enlarged view explaining a mode that a mounting stay deform | transforms back. 6 is a front view of an electric horn according to Embodiment 2. FIG. FIG. 6 is a cross-sectional view taken along line A2-A2 of FIG. It is sectional drawing of the conventional electric horn.

Embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1) The electric horn of this embodiment is a flat horn, and is housed and fixed in the bottomed cylindrical housing 1 and in the vicinity of the center of the housing 1 as shown in FIGS. An electromagnet 2, a diaphragm 3 that is fixed to the outer peripheral edge of the housing 1 and covers the opening of the housing 1, a movable iron core 4 that is fixed near the center of the diaphragm 3 and is disposed opposite to the fixed iron core 2 a of the electromagnet 2; And a mounting stay 5 fixed to the bottom of the housing 1 for mounting on a vehicle or the like.

  The electromagnet 2 is fixed to the center portion of the housing 1. The housing 1 and the diaphragm 3 are formed by pressing a plate of an iron-based magnetic material into a concave shape so as to constitute a part of the magnetic circuit of the electromagnet 2.

  The electromagnet 2 is provided with a coil 2c wound around a resin bobbin 2b, and a cylindrical part 4a below the movable iron core 4 formed in a cylindrical shape is disposed in a central hole part of the bobbin 2b. Has been. A center hole portion 3a of the diaphragm 3 and a cylindrical portion (burring portion) 6a at the center portion of the resonance plate 6 are fitted and fixed to the small diameter portion 4b of the upper portion of the movable iron core 4 by caulking.

  The concave intermediate flat portion 1b of the housing 1 includes a protruding portion 2b2 protruding radially outward from the upper flange portion 2b1 of the bobbin 2b, a movable contact support plate 7 made of a metal spring material, a fixed contact support plate 8, and Insulating members (not shown) interposed between the two contact support plates 7 and 8 are laminated, and these members are fixed by caulking with metal rivets 9.

  A movable contact 7a is fixed to the movable contact support plate 7, and a fixed contact 8a is fixed to the fixed contact support plate 8, respectively. The movable contact 7a is a normally closed contact that is crimped to the fixed contact 8a by the spring force of the movable contact support plate 7 during normal operation (when the coil 2c is not energized).

  A ring-shaped flange portion 4c projecting radially outward is integrally formed on the outer peripheral surface of the axially intermediate portion of the movable iron core 4 by cold forging or the like. The flange portion 4c of the movable iron core 4 constitutes a pressing portion that presses a portion of the movable contact support plate 7 near the center of the horn downward (rearward in FIG. 2).

  A tool locking hole 4e is formed in the small diameter portion 4b at the top of the movable iron core 4. The tool locking hole 4e is preferably a hexagonal cross section.

  The central portion of the diaphragm 3 whose outer peripheral portion is wound around the flange portion 1c of the outer peripheral end of the housing 1 is press-fitted and fixed to the small diameter portion 4b of the upper portion of the movable iron core 4 by caulking.

  Further, the resonance plate 6 is press-fitted into the small-diameter portion 4 b at the top of the movable iron core 4 until the peripheral edge of the cylindrical portion 6 a at the center of the resonance plate 6 comes into contact with the center of the vibration plate 3, and is fixed by caulking. Yes.

  The fixed iron core 2a is fixed to the center portion of the bottom surface portion 1d of the housing 1 by means such as caulking. A screw hole 2a1 is formed in the fixed iron core 2a, and the mounting stay 5 is fixed with a bolt 10.

  A vent hole 1 a is opened at the lower part of the housing 1. A ring-shaped convex portion 1d protrudes outward (backward) from the vent hole 1a. This ring-shaped convex part 1d is easily formed by forming the vent hole 1a by burring.

  As shown in FIG. 3, the metal plate mounting stay 5 closes a fixing portion (fixing hole) 5 a that is fixed to the back of the bottom of the housing 1 near the center and a vent hole 1 a that opens to the housing 1 near one end. A closing portion 5b and an attachment hole 5c for attachment to a vehicle or the like are provided at the other end portion.

  The mounting stay 5 is, for example, a high-strength steel plate that is bent in the forward direction along the shape of the bottom surface of the housing 1 and then bent downward (see FIG. 2). Therefore, the blocking portion 5b can block the vent hole 1a with a small gap.

  The front stay of the mounting stay 5 may be bent so that the closing portion 5b is pressed against the ring-shaped convex portion 1d by a spring force. The gap between the closing portion 5b and the ring-shaped convex portion 1d is reduced, and intrusion of water droplets or the like from the vent hole 1a is suppressed. Since the ring-shaped convex part 1d is formed in the housing 1, the closing part 5b bent forward can contact the ring-shaped convex part 1d without a gap.

  Next, the operation of the flat electric horn of this embodiment will be described. When a horn switch (not shown) is turned on, a current from the on-vehicle power source is supplied from a connector (not shown) to the coil 2c → movable contact support plate 7 → movable contact 7a → fixed contact 8a → fixed contact support plate 8 → rivet 9 → housing 1 → Fixed iron core 2a → Stay 5 → Body (ground).

  As a result, the electromagnetic force of the coil 2c acts on the suction gap between the movable iron core 4 and the fixed iron core 2a, and the movable iron core 4 is attracted to and collides with the fixed iron core 2a. Due to the displacement of the movable iron core 4, the flange portion 4c of the movable iron core 4 presses the movable contact support plate 7, and the movable contact 7a is separated from the fixed contact 8a. As a result, the energization to the coil 2c is interrupted and the electromagnetic force disappears, so that the movable iron core 4 returns to the original position by the elastic force of the diaphragm 3, and thereby the movable contact 7a and the fixed contact 8a are closed. The state revives. In this way, when the coil 2c is energized, the movable core 4 is repeatedly collided with the fixed core 2a, and the diaphragm 3 and the resonance plate 6 vibrate at a high frequency to sound a warning sound.

  As described above, when the electric horn operates, the diaphragm 3 vibrates back and forth in FIG. When the diaphragm 3 vibrates backward (displaces), as shown in FIG. 4, the air in the housing 1 (the space formed by the housing 1 and the diaphragm 3) tends to flow through the vent hole 1a in the direction of arrow A3. To do. Then, a part of the air flow flows out through the gap between the convex portion 1d and the closing portion 5b as indicated by the dotted arrow A4, but most of the air flow pushes the closing portion 5b backward. Then, the closing portion 5b warps in the direction of arrow A4 against the spring force of the stay 5, so that the gap between the convex portion 1d and the closing portion 5b becomes large, and air can easily enter and exit through the vent hole 1a. . Since the lower end portion far from the fixed portion 5a is pushed by air, the lower end portion of the stay 5 is elastically deformed in the arrow A5 direction with a slight force.

  When the electric horn is not in operation, the air in the housing 1 does not push the closing portion 5b backward, so the closing portion 5b closes the convex portion 1d with a small gap by the spring force of the stay 5. Therefore, water, dust, sand and the like do not enter from the vent hole 1a. Further, when the horn is operated, the air in the housing 1 pushes the blocking portion 5b backward, so that the gap between the convex portion 1d and the blocking portion 5b becomes large and air can freely enter and exit from the vent hole 1a. The vibration of the diaphragm 3 is not suppressed.

In the electric horn of the present embodiment, the ring-shaped convex portion 1d protrudes rearward of the housing 1, so that water droplets flowing through the rear surface of the housing 1 and dust that bounces off the ground are prevented from entering the housing. Is done.
(Embodiment 2) The electric horn of the present embodiment is a spiral horn, and is housed and fixed near the center of the bottomed cylindrical housing 1A and the housing 1A as shown in FIGS. An electromagnet 2A, a diaphragm 3A that is fixed to the outer peripheral edge of the housing 1A and covers the opening of the housing 1A, a movable iron core 4A that is fixed near the center of the diaphragm 3A and is disposed opposite to the fixed iron core 2Aa of the electromagnet 2A; And an attachment stay 5A that is fixed to the bottom of the housing 1A and is attached to a vehicle or the like.

  The outer peripheral end of the housing cover 1Ac is fastened and fixed to the outer peripheral end of the housing 1A so as to overlap the outer peripheral end of the diaphragm 3A. An opening 1Ad is provided at the center of the housing cover 1Ac.

  The spiral resonance tube 11 is fixed to the housing cover 1Ac, and defines the sound wave emission path 11c with the housing cover 1Ac. The resonance tube 11 has an inlet opening 11a that defines a part of one end of the sound wave output path 11c, and a rectangular sound wave outlet opening (not shown) that defines the other end of the sound wave output path 11c. . The sound wave emission path 11c is partitioned in a spiral shape around the inlet opening 11a.

  A screw hole 2Aa1 is formed in the fixed iron core 2Aa, and the mounting stay 5A is fixed by a bolt 10.

  A vent hole 1Aa is opened at the bottom of the housing 1A. Unlike the first embodiment, the electric horn of the present embodiment has no ring-shaped convex portion protruding outward (rearward) from the vent hole 1Aa.

  The mounting stay 5A includes a fixing portion (fixing hole) 5Aa that is fixed to the back of the bottom of the housing 1A in the vicinity of the center, a closing portion 5Ab that closes the vent hole 1Aa that opens in the housing 1A in the vicinity of one end, a vehicle, It is provided with a mounting hole 5Ac for mounting. The closing part 5Ab of this embodiment is a part where the metal plate extending downward from the fixing hole 5Aa faces the vent hole 1Aa.

  The mounting stay 5A bends forward so as to follow the shape of the bottom surface of the housing 1A, and then bends downward. Therefore, the planar blocking portion 5Ab can block the vent hole 1Aa with a small gap.

  Next, the operation of the spiral electric horn of this embodiment will be described. By intermittently energizing the coil 2Ac, the movable iron core 4A is intermittently attracted to the fixed iron core 2Aa and vibrates. When the movable iron core 4A vibrates, the diaphragm 3A also vibrates together (back and forth in FIG. 6), and a sound wave (air vibration) is propagated into the resonance tube 11 from the opening 1Ad of the housing cover 1Ac. When the diaphragm 3A vibrates back and forth in FIG. 6, the air in the housing 1A (the space formed by the housing 1A and the diaphragm 3A) tends to flow through the vent hole 1Aa in the direction of arrow A3. Then, a part of the air flow flows out through a gap between the blocking portion 5Ab and the outer surface of the housing 1A, but most of the air flow pushes the blocking portion 5Ab backward. Then, the lower end portion of the stay 5A is pushed in the direction of arrow A5 (rearward in FIG. 6), the gap between the closing portion 5Ab and the outer surface of the housing 1A is increased, and air can easily enter and exit through the vent hole 1Aa.

  Therefore, when the horn is not in operation, the blocking portion 5Ab blocks the air hole 1Aa with a small gap, so that water, dust, sand and the like cannot enter from the air hole 1Aa. Further, when the horn is operated, the closing portion 5Ab is pushed rearward, so that a gap between the outer surface of the housing 1A and the stay 5A is increased, and air can freely enter and exit from the vent hole 1Aa. The vibration of is not suppressed.

1, 1A ······· Housing 1a, 1Aa ········· Vent 1d ···············································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electromagnet 3, 3A ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Vibration plate 4, 4A ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Movable iron core 5, 5A ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mounting stay 5a, 5Aa ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing part 5b, 5Ab ・ ・ ・ ・ ・ ・ ・ ・ Blocking part

Claims (2)

A bottomed cylindrical housing, an electromagnet housed and fixed near the center of the housing, a diaphragm fixed to the outer peripheral edge of the housing and covering the opening of the housing, and fixed near the center of the diaphragm An electric horn having a movable iron core disposed opposite to the electromagnet, and an attachment stay fixed to the bottom of the housing and attached to a vehicle or the like,
The electric stay is provided with a fixing portion that is fixed to the back of the bottom of the housing near the center, and a closing portion that closes a vent hole that opens to the housing near one end.   The electric horn according to claim 1, wherein the housing includes a ring-shaped convex portion protruding outward from the vent hole.

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