KR100975677B1 - Assemble structure for automobile horn - Google Patents

Abstract

PURPOSE: The assembly structure of a vehicle horn is provided to implement higher productivity than a conventional component having a direction by forming a fixed iron core and the assembly of a body to be same circular shape. CONSTITUTION: An excitation coil(5) is rolled with a bobbin(2) inside a metallic body(1). A fixed iron core is magnetized by applying a current to the excitation coil. A suction force is varied according to the magnetization of the fixed iron core. A diaphragm(9) vibrates a movable corer according to the variation of the suction force. The fixed iron core is formed as a tooth structure(3a). The fixed iron core is inserted into the inner circumference of the central part of the bobbin. The fixed iron core is contacted with the penetration hole of the body.

Description

Assembly structure for automobile horn {Assemble structure for Automobile horn}

The present invention relates to a car horn, more specifically, by having an excitation coil inside to interrupt the current flowing in the excitation coil, as the fixed iron is magnetized and non-magnetically connected, the movable iron moves up and down, Moreover, it is related with the car horn which generate | occur | produces a sound by the reciprocating motion of the diaphragm integrated with this.

The present invention relates to a method of fixing a bobbin and a fixed iron core and a fixing iron core and a body in a horn used in automobiles and the like.

For example, as disclosed in KR Publication No. 2000-0004683 (2002.01.16), as illustrated in FIGS. 1A and 1B, a hole is formed in a body for fixing a bobbin wound with a female coil, and a separate bobbin fixing yoke The method of fixing using is used. The disadvantages of this are known in the literature regarding the addition of parts, the increase in manufacturing labor, and the decrease in watertightness.

In order to solve the above disadvantages, the method of claim 1 provides a step on the inner circumferential surface of the bobbin so as to position the fixed iron core and caulk and fix the upper surface of the fixed iron core.

KR2000-0004683 A

Matters to be solved in the present invention is a method of fixing the bobbin and the fixed iron core and the fixed iron core and the body in the car horn.

The assembly by the conventional method is illustrated in Fig. 1, and the rigid iron core by locally caulking (3c) the area where the upper circumferential portion of the upper surface of the fixed iron core, which is a relatively soft metal material, and the inner circumferential surface of the bobbin, are firmly fixed to the body and the fixed iron core. Is fixed to the bobbin 2 by protruding to the side, but during the caulking process, the fixed iron core caulking portion 3c is unevenly protruded in the distal direction 13a of the movable core to be kept flat. ) And the air gap (G), which is the distance between the tip of the fixed iron core (3b), becomes unstable, and there is a problem in performing a unique function of the horn.

This air gap plays an important role in the magnetic circuit of the horn. Usually, it is managed within 0.2mm. When the air gap is smaller than the prescribed value, the moving gap and the fixed iron are strongly impacted and the tone is broken. Loss of volume due to loss causes horn function to be deteriorated.

In addition, after fixing the fixing core and the bobbin, the bracket 14 is fastened with a nut 4 to the screw forming portion 3f of the fixing iron core for vehicle mounting in a subsequent assembly process. The tightening torque generated at this time reaches about 160 ~ 190kgfcm, and the fixed iron core and the fixed portion (3g) of the body are weakened by this rotational force, and the caulking portion (3c) of the fixed iron core and bobbin is continuously driven by this rotational force. Due to the loosening of flow between the bobbin (2) and the fixed iron core (3), poor sound quality is caused by incomplete restraint of the bobbin during the operation of the horn. In order to complement the flow problem, the assembly hole of the fixed core of the body is complemented by a combination of squares (1b) in the circle illustrated in Figure 4 so as to correspond to each other, but inevitably given the directionality problem that the productivity is deteriorated Have

Next, the portion on which the bracket 14 is mounted on the body abuts against the outer diameter 3e of the caulking portion of the fixed iron core, that is, a gap H is generated between the body 1 and the bracket 14. Since the gap is formed, the movable iron core moves during the operation of the horn, and there is a disadvantage in absorbing the impact amount when the fixed iron core is impacted. That is, the bracket 14 does not come in contact with the rear of the body in a large area, the rigidity is insufficient, so that the sound quality becomes unstable. In addition, this assembly structure, the arm length is naturally longer under the vibration test conditions, when the weight of the horn is more than 250g, the bracket is caulking the body and the fixed core during the test according to the vibration test of the automotive parts KS R 1034 [Table 1] There is a problem in terms of vibration resistance that is broken at the rear contact portion 3e.

NO Item standard Sum and Decision Criteria One Frequency 2,000 times / min (about 33.3 Hz) No harmful defect or damage after test

2 Vibration acceleration 4.4G 3 Vibration direction Up and down-> 2 hours
Before and after-> 2 hours
Left, right-> 2 hours

The present invention is to solve the above problems by forming the circumferential portion of the fixed iron core to the tooth structure by forcing the front end surface of the fixed iron core into the inner circumferential surface of the bobbin made of resin material by mechanical pressing force, the tooth portion of the fixed iron core dug the inner wall of the bobbin The outer diameter of the fixed iron core is formed about 0.25 ~ 0.30mm larger than the inner diameter of the bobbin.

In order to prevent the protrusion of the fixing core to the upper part, the fixing of the body and the fixing core by the continuous process is formed by giving a chamfer, step, or burring to the inside or outside of the caulking portion of the body in a flat shape. When the part of the fixing core is filled is characterized in that the bracket is fixed so as not to protrude to the surface to be fastened.

In addition, after the body of the fixed iron core and the body to be assembled with each other to the inside or outside of the body after inserting the fixed iron core is characterized in that the coating agent for preventing moisture inflow

The assembly method according to the present invention is to ensure that the fixing of the bobbin and the fixed iron core while maintaining the fixing of the bobbin and the fixed iron core while the air gap (G) which is important for the performance of the horn is not made stably as the damage to the front end face between the fixed iron core and the movable iron core is eliminated. Can be.

In addition, the disadvantage that the fixed iron core itself is rotated by the rotation torque given when the bracket and the fixed iron core are fastened to correspond to the rotational force by the tooth assembly structure of the bobbin and the fixed iron core, and the assembly of the body and the fixed iron core is fixed to the fixed core core or By applying a sealing agent, it is possible to simply block the inflow of water to the corresponding part.

In terms of assemblability, the shape of the assembly part of the fixed iron core and the body is made in the same circular shape, so that the productivity is maintained more than the existing components given the direction.

In addition, the impact amount caused by the impact of the fixed core and the movable core caused by the horn operation is closely assembled to the body of the bracket without increasing the overall thickness to increase the rigidity of the body itself. It can absorb noise caused by impact caused by impact of movable iron core.

Finally, the bracket has a stable and wide mating area at the rear seating area of the body, and its arm length is shortened by about 5 ~ 7mm compared to the horn with the fixed iron core and the caulking surface of the body protruding to the rear. When the vibration test according to 1034 [Table 1], the problem that the bracket was broken could be solved.

1 is a cross-sectional view of a conventional horn
2 is a cross-sectional view of the horn according to Embodiment 1 of the present invention.
3 (a), (b), (c) is a partial cross-sectional view illustrating the fixing process of the bobbin, fixed core, the body according to the first embodiment of the present invention
4 is a plan view of the body of the existing horn
5 is a three-dimensional view of a fixed iron core according to Embodiment 1 of the present invention
6 is a cross-sectional view of the body according to Embodiment 1 of the present invention.
7 is a partial cross-sectional view assembled after the inner burring according to the second embodiment of the present invention
8 is a partial cross-sectional view assembled after the outer burring according to the second embodiment of the present invention
9 is a cross-sectional view of the fixing core according to the embodiment 2,
10 is a partially enlarged cross-sectional view of the inner burring of Embodiment 3 of the present invention.
11 is a partially enlarged cross-sectional view of the outer burring of Embodiment 3 of the present invention.

Hereinafter, the present invention will be described in more detail according to an exemplary embodiment with reference to the attached drawings.

The matters of the first embodiment of the present invention are located in the upper part of the bobbin in the state in which the coil 5 is wound around the bobbin 2, as shown in Fig. 3a. The fixed iron core 3 is forcibly pressed through the attached punch 40. As the pressing force is applied from the upper side, the tooth outer diameter portion 3a of the fixed iron core made of metal penetrates into the inner circumferential surface 2a of the bobbin made of resin, and lowers downward. 3a) is configured to be larger than 0.25 ~ 0.30mm than the inner diameter (2a) of the bobbin.

3B shows a state just before the fixed iron core 3 is engaged with the body 1, and a jig 41 for supporting the body 1 is formed at the bottom thereof. As the upper punch 40 continues to move downward, the step 3h of the fixed iron core comes into contact with the contact surface 1d of the body, and at the same time, the protrusion 3d of the fixed iron core is provided with the lower support jig 41. Caulking is pushed into the avoidance space (1c) of the body to be filled. In this way, water inflow from the outside can be prevented without protruding beyond the surface of the first stepped plane portion 1a of the body. Here, the pierced hole 1b of the body 1 in contact with the fixed iron core is molded in a circular shape during the press working process (not shown) to increase assemblability, and has a free space 1c outside. In the present description, the free space has been given in the form of a chamfer, but the shape of the free space can have the same effect as the shape 1f of the two-stage structure as illustrated in FIG. 3C shows a state in which the bobbin 2, the fixed iron core 3, and the fixed iron core 3 and the body 1 described above are assembled. In the subsequent process, the rivet 30 rivets the bobbin 2, the body 1, the terminal case 100 with two terminals 50 (not shown) to enable power supply. .

In the assembly structure and method according to the present invention, as described in the above process, the bobbin 2 and the fixing iron core 3 are firmly fixed in the up and down and circumferential directions by the tooth structure. This plays a major role in preventing the torque from rotating when the nut is tightened. In addition, since the shape of the punch 40 pressed from the top is flat, it does not affect the flat part 3b of the fixed iron core at all. FIG. 2 has a structure in which there is no gap H between the body 1 and the bracket 14 formed in FIG. 1 in a final assembled shape, and the bracket 14 is wider than the outer diameter of the first step plane portion 1a of the body. To meet. In the case of the conventional horn-mounted horn, three sheets of 0.7 mm thickness were used as the SK5 material, but the structure of the present invention showed excellent effect even when two sheets of 0.8 mm thickness were used as the SK5 material. Cost savings could be achieved.

Next, Embodiment 2 of the present invention will be described according to the illustrated matter of FIG. The second embodiment is characterized in that the fixed iron core 3 and the body 1 are smaller in contact with each other than the first embodiment in a more stable form. Since the supporting jig 41 and the like of the assembly process is the same form of the punch 40, description and drawing will be omitted. The fixed iron core assembly of the body 1 protrudes by burring 1k in the inner direction in which the bobbin 2 is located, and is provided with an iron washer 15 between the body 1 and the bobbin 2. The iron washer 15 is to form a uniform height because the burring height of the body is non-uniform, there is an effect of additional supplementary impact stiffness and magnetic strength reinforcement.

When the fixed iron core 3 is provided as a tooth type, pressing the tip end surface 3b of the fixed iron core from the upper side and press-fits it, the toothed portion 3a of the fixed iron core proceeds downward while digging into the inner circumferential surface 2a of the bobbin. The stepped portion 3h of the iron core is brought into contact with the flat portion of the steel washer 15 and stopped. 9 is a shape of a fixed iron core 3 applied to the second embodiment, and the cylindrical portion 3i is press-fitted into the hole of the burring portion 1k of the body. The caulking portion 3p of the fixed iron core is pressed by the lower jig and is fixed while being filled with the avoidance space 70.
Next, a drawing corresponding to claim 5 is illustrated in FIG. 8, wherein the assembly method and structure of the teeth 3a of the fixed iron core and the inner circumferential surface 2a of the bobbin are the same as those mentioned above, and the fixed iron core The burring part hole 1m of the body assembled to abut on the cylindrical portion 3i of the outer side (the direction in which the bracket 14 is placed) is configured so that the fixing iron core 3 is inserted into the clamping portion of the fixing iron core ( 3p) is pressed on the lower jig to be filled with the evacuation space 70 and is fixed.

Embodiment 3 of the present invention is illustrated in FIGS. 10 and 11 corresponding to claims 6 and 7, respectively, and the fixing process of the bobbin 2 and the fixing iron core 3 will be omitted. The difference from the second embodiment is that after the forced insertion of the fixed iron core (3) by applying a sealing agent to the contact portion 80 of the burring portion (1k) and the cylindrical portion (3i) of the fixed iron core of the body flows into the corresponding portion by the capillary phenomenon It simply cuts off the moisture. Sealing agents can be blocked with adhesives, silicones, paints, bonds and epoxy resins.

According to the experimental results of the present inventors, the inner diameter of the burring portion of the body is 6.2mm and the outer diameter of the press-fitting portion 3i of the fixed iron core is 6.45mm to 0.25mm, which is firmly fixed at the time of forced insertion, thereby affecting the air gap. It was confirmed that the height of (3b) did not change. The load that the fixed iron core (3) was forced to insert was 50kgf or more, which was sufficient in practical terms. In addition, in the subsequent process, the nut 4 is tightened with the bracket 14 and the body 1 interposed therebetween, so that the end surface 3b of the fixed iron core can be stably and firmly fixed at the intended position.

<Explanation of symbols on main parts of the drawings>
1: Body 1a: The first stepped plane portion of the body
1c: Body evasion clearance
1k: Burring part of the body
2: bobbin 2a: inner circumference of bobbin
3: fixed core 3a: toothed outer diameter of the fixed core
3d: outer caulking part of fixed iron core
3e: protrusion after fixing iron core caulking of existing products
5: coil
13: Moving core 14: Brackets
30: Rivets
40: Punch 41: lower support jig
50: Terminal
80: circumferential portion to be sealed

Claims (9)

It is produced by having the iron body 1 on the outside and winding the excitation coil 5 around the bobbin 2 inside the body to allow the current to flow intermittently through the excitation coil 3 to become magnetized and non-magnetized. In the horn which generates a beep by vibrating the diaphragm 9 by sucking and restoring the movable iron core 13 integrated with the diaphragm 9 by the change of the suction force.
Set the fixed core 3 as the tooth structure 3a
In the process of inserting the bobbin into the inner peripheral surface (2a) of the bobbin while making a groove in the bobbin 2 is fixed to the bobbin (2), the through hole (1b) of the body in contact with the fixed iron core (3) is provided
By caulking and fixing the jaw (3d) of the fixed iron core protruding to the outside of the body,
A horn, which is fixed so as not to protrude beyond the first step plane portion 1a of the body.
The method according to claim 1, characterized in that the through hole (1b) of the body in contact with the fixed core (3) is circular and forms a chamfer (1c) on the outer side.
The method according to claim 1, characterized in that the through hole (1b) of the body in contact with the fixed core (3) is circular and forms a step (1f).
The burring (1k) of the body (1) to the inside where the bobbin (2) is located, The iron washer (15) provided between the body (1) and the bobbin (2).
It is produced by having the iron body 1 on the outside and winding the excitation coil 5 around the bobbin 2 inside the body to allow the current to flow intermittently through the excitation coil 3 to become magnetized and non-magnetized. In the horn which generates a beep by vibrating the diaphragm 9 by sucking and restoring the movable iron core 13 integrated with the diaphragm 9 by the change of the suction force.
Set the fixed core 3 as the tooth structure 3a
It is fixed with the bobbin (2) while making a groove in the bobbin (2) in the process of inserting it into the central peripheral surface (2a) of the bobbin,
A horn, characterized in that the caulking portion (3p) of the fixed iron core protruding to the outside of the burring hole after the cylindrical portion (3i) of the fixed iron core is inserted into the body hole burring (1m) to the outside.
The steel body 1 is provided on the outside, and the excitation coil 5 is wound around the bobbin 2 inside the body to allow the current to flow intermittently, thereby generating the magnetization and non-magnetization of the fixed iron core 3. In the horn which generates a beep by vibrating the diaphragm 9 by sucking and restoring the movable iron core 13 integrated with the diaphragm 9 by the change of the suction force.
In the process of inserting the fixed iron core 3 into the tooth structure (3a) to the inner peripheral surface (2a) of the central portion of the bobbin is fixed while making a groove in the bobbin (2),
An iron washer 15 is provided between the bobbin 2 and the body 1,
After the cylindrical portion 3i of the fixed iron core is inserted into the body hole burring (1k) inwardly,
A horn, characterized in that the sealing agent is applied to the circumference (80).
The steel body 1 is provided on the outside, and the excitation coil 5 is wound around the bobbin 2 inside the body to allow the current to flow intermittently, thereby generating the magnetization and non-magnetization of the fixed iron core 3. In the horn which generates a beep by vibrating the diaphragm 9 by sucking and restoring the movable iron core 13 integrated with the diaphragm 9 by the change of the suction force.
In the process of inserting the fixed iron core 3 into the tooth structure (3a) to the inner peripheral surface (2a) of the central portion of the bobbin is fixed while making a groove in the bobbin (2),
After the cylindrical portion 3i of the fixed iron core is inserted into the body hole burring outwardly (1m) by force fitting
A horn, characterized in that the sealing agent is applied to the circumference (80).
The method of claim 7, wherein the sealing agent is characterized in that the paint, adhesive, silicon, bond, epoxy resin.
The bracket (14) according to claim 6, wherein the body (1) is assembled in direct contact with each other.

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