JPH0447757Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a diaphragm attachment structure that is attached to an open-type automobile horn without a horn cover.

[Problems to be solved by the prior art and the invention] Generally, some automobile horns have a horn cover attached to the opening edge of the case body, while others do not. In the former case, although the presence of the horn cover effectively protects the diaphragm, there is a problem in that it hinders the reduction in weight and size. On the other hand, the latter so-called open type does not have a horn cover, so it is necessary to pay attention to the mounting location to protect the diaphragm, but the lack of a horn cover makes it lighter and more compact. It will be possible to achieve
Recently, such open-type automobile horns have become widely available.

In order to attach the diaphragm to the case body of such an open-type horn, in the conventional case, a ring-shaped fixture with a roughly L-shaped cross section is prepared, and this fixture 21 is attached as shown in Fig. 3. A back receiving portion 2 formed in a flat shape on the outer peripheral edge of the case body 2
With the diaphragm 13 attached to a, insert it from the diaphragm side and apply the diaphragm surface to the flat plate-shaped surface receiving plate portion 21a of the fixture 21. In this state, the surface receiving plate portion 21a is The diaphragm 13 is attached to the case by bending the cylindrical back receiving plate portion 21b on the tip side inward by caulking, and overlapping the back receiving plate surface 21b with the back surface of the case body back receiving portion 2a. Physically, it was installed on one side. However, this method requires a separate dedicated fixture 21, which increases the number of parts, and has the drawbacks that the horn itself cannot be made lighter and more compact. , there is a need for the development of techniques to install diaphragms without using special fixtures.

As described above, as a method for attaching the diaphragm without using a dedicated fixture, it is proposed to use the outer peripheral edge of the case body. That is, a cylindrical surface receiving part is formed on the tip side of a flat back receiving part formed at the outer peripheral edge of the case body, and the surface receiving part is folded inward to form the outer peripheral edge of the diaphragm. In this method, the diaphragm is sandwiched between the front and back surfaces so that the diaphragm is integrally attached to the case body.

By the way, when the cylindrical part formed on the tip side (outer circumferential side) of the flat part is caulked and folded inward in this way, the corner part of the flat part and the cylindrical part is the folded end. However, this folded end portion is folded back with the portion on the cylindrical portion side necessarily inward. Therefore, if this method is used as is to attach the diaphragm to the case body, the part of the folded end on the surface receiving part side will move inward and come into contact with the outer periphery of the diaphragm. Therefore, compressive stress acts on the diaphragm over almost the entire circumference, and the diaphragm
Distortion occurs in the radial and axial directions, which impedes smooth vibration of the diaphragm, resulting in insufficient volume and poor sound quality, which is undesirable.

In order to avoid this, a ring-shaped diaphragm protection member with an outer diameter set to approximately the same diameter as the diaphragm outer diameter is interposed between the diaphragm surface and the front side receiving part, and the It is conceivable to take care so that the part on the receiving part side does not move inward, or to make the diaphragm small in diameter so that it does not come into contact with the folded part when folded back. In the latter case, a diaphragm protection member is required, making it impossible to reduce the number of parts and hindering weight reduction.In addition, in the latter case, centering (positioning) the diaphragm during assembly is difficult and requires a centering tool. In addition to requiring a separate tool, the diaphragm may become misaligned due to vibrations or shocks after assembly, and this may result in a small gap between the diaphragm armature and the magnetic path it creates. There is also a risk that the diaphragm will not operate due to contact between the core and the core that is separated by a gap.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a diaphragm mounting structure for an open-type automobile horn that can eliminate these drawbacks. An open type automobile in which a horn cover is not integrally attached to the opening edge of a case body in which a vibration member for vibrating a diaphragm whose outer peripheral edge is supported by the opening edge to generate sound is installed. In the horn for use, the diaphragm has a flat back receiving part formed at the opening edge of the case body to receive the back face of the outer peripheral edge of the diaphragm, and a cylindrical part formed at the tip side of the back receiving part. In order to attach the diaphragm integrally to the case by folding it inward and sandwiching it between the surface receiving part that receives the surface of the outer peripheral edge of the diaphragm, place the outer peripheral edge of the diaphragm at the corner between the front and back receiving parts. The outer diameter of the diaphragm is set to be smaller than the inner diameter of the folded end of the case body that constitutes the outer diameter edge of the horn, and the outer circumference of the diaphragm having the small diameter is
The device is characterized in that a plurality of protrusions are formed, the tip of which abuts against the inner periphery of the folded end to center the diaphragm with respect to the case body.

With this configuration, the diaphragm is attached using the outer periphery of the case body, but the diaphragm does not become distorted, centering is easy, and the diaphragm is easily removed by impact. This is to prevent the position from shifting.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes an automobile horn, and a pole 3 is integrally fixed to the center of a case body 2 constituting the horn 1.
A coil 4 is wound around a bobbin 4a fixed to the case body 2 so that the pole 3 is centered. 5 is a terminal, and the terminal 5 is laminated together with an insulator 6, a case body 2, a bobbin 4a, a movable contact piece 7, an insulator 8, and a fixed contact piece 9, and is held together by a rivet 10. is firmly fixed. Moreover, the contacts 11 and 1 are always in contact with the contact pieces 7 and 9 and are in a closed state.
2 are installed integrally.

Reference numeral 13 denotes a diaphragm, and armatures 14 and 15 are fixed to the center of the diaphragm 13 with an insulator 16 in between, and one armature 14 faces the pole 3. When the contacts 11 and 12 are closed, the insulator 16 is in contact with the movable contact piece 7.
Further, on the outer peripheral edge of the diaphragm 13, a plurality of protrusions 17 (in this embodiment, a total of six protrusions are provided at equal intervals) are integrally protruded in the outer radial direction. ing.

On the other hand, at the opening edge of the case body 2, there is a back receiving part 2a which is planar and receives the back surface of the diaphragm 13, and a cylindrical surface formed on the tip side of the back receiving part 2a. A receiving portion 2b is formed. The diaphragm 13 is fitted into the cylindrical surface receiving part 2b so that its back surface is received and supported by the back receiving part 2a, and the back receiving part 2b is caulked and folded back inward in a curved shape. By bending, the tip edge 2c is brought into contact with the outer circumferential edge surface of the diaphragm 13 at a position inward from the protrusion 17, so that the outer circumferential front and back surfaces of the diaphragm 13 are in contact with the receiving portions 2a, 2b, and is integrally attached to the case body 2. Here, the outer diameter K of the diaphragm 13 is set to be smaller than the inner diameter L of the folded end 2d, which is the corner part of both receiving parts 2a and 2b and forms the outer diameter edge of the horn. Although it is designed not to come into contact with the inner circumferential surface of the portion 2d, the outer diameter M of the virtual circle A connecting the tips of the respective protrusions 17 is made to approximately match the inner diameter L of the folded end portion 2d. As described above, when the diaphragm 13 is mounted in a pinched manner by the outer peripheral edge of the case body 2, the tip of the protrusion 17 is attached to the folded end 2d.
The diaphragm 13 is positioned, that is, centered, with respect to the case body 2 by coming into contact with the inner circumferential surface of the diaphragm 13.

In the figure, 18 is a resonator, 19 is a gasket, and 20 is a core.

In the embodiment of the present invention constructed as described above, when the coil 4 is energized by closing a switch (not shown), the armature 14 is attracted and lowered to move toward the pole 3 side. Along with this, the insulator 16 moves the movable contact piece 7 that is in contact with it downward,
This opens the contacts 11 and 12 and the coil 4
Power is cut off. Then, the lowered armature 14 returns to its original position and the contact 1
1 and 12 are also closed, and the coil 4 is energized again.
By continuously repeating such a series of operations, the diaphragm 13, which is integrated with the armature 14, vibrates and a resonant sound is emitted.

In this way, in the present invention, the resonant sound is emitted by the continuous reciprocating movement of the armature 14, but the diaphragm 13 folds back the surface receiving portion 2b formed at the opening edge of the case body 2. Since it can be attached integrally by simply bending, there is no need for a dedicated fixing plate as in the past, and the number of parts can be reduced, and the horn 1 can be made lighter and more compact.

That is, at the opening edge of the case body 2, a surface receiving portion 2b is formed on the tip side of the back surface receiving portion 2a, and the diaphragm 13 is formed by simply folding the surface receiving portion 2b inward. The diaphragm 13 will be clamped and fixed to the case body 2, but in that case, the outer diameter K of the diaphragm 13 is smaller than the inner diameter L of the folded end 2d, and the diaphragm 13 comes into contact with the inner peripheral surface of the folded end 2d. Therefore, if the outer circumference of the diaphragm 13 is brought into contact with the inner circumference of the folded end 2d for centering, the folded end 2
The protrusion 1 slightly protrudes from the outer periphery of the diaphragm 13 without applying compressive stress to the entire outer periphery of the diaphragm 13 due to the inward portion of the surface receiving portion of d.
7 only comes into contact with the folded end portion 2d, distortion of the diaphragm 13 in the radial and axial directions can be effectively avoided, and the diaphragm 1
3 can be made to have almost no distortion over its entire vibration effective surface.

In this way, the outer diameter of the diaphragm 13 is made smaller than the inner diameter of the folded end portion 2d, and the surface receiving portion 2b is
When folding back, the surface receiving portion side portion of the folded end portion 2d is prevented from coming into contact with the diaphragm 13, thereby effectively preventing distortion of the diaphragm 13 without using a diaphragm reinforcing member. However, the centering and positioning of the diaphragm 13 can be reliably achieved by the protrusion 17 coming into contact with the inner circumferential surface of the folded end 2d. As a result, the diaphragm 13 is free from distortion and deformation, and is positioned at an appropriate position, so that it does not shift even when severe vibrations or shocks are applied to the horn 1, and it always vibrates normally, increasing the volume. Extremely excellent sound quality can be achieved while reducing weight.

Further, in this embodiment, the diaphragm 13 is attached by bending the folded end 2d into a curved shape so that the tip edge comes into contact with the outer peripheral edge of the diaphragm 13. ,
The substantial attachment action of the diaphragm 13 is performed inside the protrusion 17, and the diaphragm 13 vibrates at this point, so that stress is applied to the protrusion 17 from the folded end 2d. However, this stress is small,
Moreover, the abutment of the tip edge 2c does not reach the substantial vibration effective surface of the diaphragm 13, and therefore even if stress is applied to the protrusion 17, the vibration effective surface of the diaphragm 13 is not affected. It is possible to design an effect that does not cause any adverse effects, which is more convenient.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and the number and shape of the protrusions can be freely set, and the folded end portion can be attached to the diaphragm in a sandwiching manner. If so, it is not necessarily necessary to bend the protrusions back into a curved shape, and the number of protrusions is preferably at least three or more in order to ensure the positioning of the diaphragm.

[Operations and Effects] In summary, since the present invention is constructed as described above, the diaphragm is received and supported by the back receiving part formed at the edge of the opening of the case body. The diaphragm is clamped and fixed to the case body by simply folding the surface receiving part formed on the tip end of the diaphragm inward. Because it has a smaller diameter than the diaphragm, it does not touch the inner circumference of the folded end, and the outer circumference of the diaphragm touches the inner circumference of the folded end for centering. The part of the folded end on the surface receiving part side does not move inward and apply compressive stress to the entire outer circumference of the diaphragm, and the protrusion slightly protruding from the outer circumference makes contact with the folded end. As a result, distortion in the radial and axial directions of the diaphragm can be effectively avoided, and there can be almost no distortion over the entire effective vibration surface.

In this way, effective distortion prevention of the diaphragm can be achieved by reducing the outer diameter of the diaphragm without interposing a dedicated diaphragm reinforcing member between the diaphragm and the surface receiving part. The centering and positioning of the diaphragm can be reliably achieved by the projection protruding from the outer periphery of the diaphragm coming into contact with the inner circumferential surface of the folded end. As a result, the diaphragm is not distorted or deformed, and is positioned at the appropriate position, so that even if the horn is subjected to severe vibrations or shocks, it will not shift, and will always vibrate normally, improving the volume and sound quality. It is possible to achieve extremely high performance while achieving weight reduction.

[Brief explanation of the drawing]

The drawings show an embodiment of a diaphragm mounting structure in an open-type automobile horn according to the present invention, in which FIG. 1 is a longitudinal cross-sectional view of the horn, FIG. 2 is a bottom view of the diaphragm, and FIG. 3 is a bottom view of the diaphragm. 1 is a partial longitudinal sectional view of a diaphragm showing a conventional example. In the figure, 1 is a horn, 2 is a case body, 2a is a back receiving part, 2b is a front receiving part, 2d is a folded end,
13 is a diaphragm, and 17 is a protrusion.

Claims (1)

[Claims for Utility Model Registration] 1. A horn cover is integrated into the opening edge of a case body in which a vibration member for vibrating a diaphragm whose outer peripheral edge is supported by the opening edge to produce sound is installed. In an open-type automobile horn that is not attached to the diaphragm, the diaphragm has a planar back receiving portion formed at the opening edge of the case body to receive the back surface of the outer peripheral edge of the diaphragm, and a tip end side of the back receiving portion. In order to attach the diaphragm integrally to the case body by folding the cylindrical part inward and sandwiching it between a surface receiving part that receives the surface of the diaphragm outer periphery, the outer periphery of the diaphragm is The corner part between the front and back receiving parts is set to have a smaller diameter than the inner diameter of the folded end of the case body that constitutes the outer diameter edge of the horn, and the tip part is set to the inner diameter of the folded end on the outer circumferential edge of the small diameter diaphragm. A diaphragm mounting structure in an open type automobile horn, characterized in that a plurality of protrusions are protruded for abutting against and centering the diaphragm with respect to a case body. 2. The surface receiving portion of the case body is folded back in a curved manner so that its tip edge contacts the surface of the outer peripheral portion of the diaphragm on the inner side of the protrusion, thereby pinching the outer peripheral edge of the diaphragm. A diaphragm mounting structure in an open type automobile horn according to claim 1 of the utility model registration claim.