JP2000294421A - Coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing of the lead out part of a lead wire. SOLUTION: A fitting protrusion 23 is provided on the connection 14 which is integrally protruding from a synthetic resin heating member 12, and a cylindrical part 26 of a connection terminal 25 connected to a coil 10 is protruding. The core wire 31 of a lead wire 39 is connected by caulking to the cylindrical part 26. A rubber stopper 35 having an insert hole 39 with a lip 40, which is used to watertightly insert the lead wire 30, is provided, and the lower end of the rubber stopper 35 is closely fitted to the outer circumference of the fitting protrusion 23 through a lip 37. A metal cover 41 is fitted to the rubber stopper 35, an insert edge 44 is inserted to an inserting groove 21, and caulking pieces 42 and 43 are caulkingly fixed to caulking surfaces 18 and 19 on the lower surface of the connection 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a coil device,
In particular, the present invention relates to an improvement in a structure of a portion from which a lead wire is drawn.

[0002]

2. Description of the Related Art Conventionally, as an example of a coil device in which a lead-out portion of a lead wire is provided with a sealing measure, Japanese Utility Model Application Laid-Open No. 5-11 / 1999
No. 410 is known. In this case, as shown in FIG. 12, a cylindrical connecting portion 3 is protruded from a synthetic resin exterior body 2 in which a coil 1 is housed, and the surface of the connecting portion 3 is connected to the coil 1. The male terminal 4 is made to protrude, and the female terminal 6 provided at the terminal of the lead wire 5 is fitted to and connected to the male terminal 4.
In order to seal the drawn-out portion, the connecting portion 3 and the lead wire 5 are covered with a heat-shrinkable tube 7 having an adhesive effect.

[0003]

SUMMARY OF THE INVENTION
The one sealed with is effective as long as it is easily waterproofed, for example, when used in an atmosphere where there is a possibility of dew condensation. However, there is a problem when immersed in water or oil. That is, since the elasticity of the heat-shrinkable tube 7 is impaired when the heat-shrinkable tube 7 is shrunk for sealing, if the lead wire 5 is shaken due to, for example, the routing of the lead wire 5, a gap is formed between the heat-shrinkable tube 7 and the tube 7. It is difficult to achieve a perfect sealing effect, especially when the film is immersed in a liquid as described above. The present invention has been completed on the basis of the above circumstances, and an object of the present invention is to ensure the sealing performance of a lead wire lead-out portion.

[0004]

As a means for achieving the above object, a coil device according to the present invention comprises:
A connection portion is formed on an exterior body made of an insulating material containing a coil, and a connection terminal connected to the coil is projected from the connection portion, and a lead wire is connected to the connection terminal. A rubber stopper having an insertion hole through which the lead wire can be inserted in a liquid-tight manner is fitted to the connection part, and a cover made of a highly rigid material that covers around the rubber stopper is fitted. It is characterized by its structure.

According to a second aspect of the present invention, in the first aspect, the cover is provided with an insertion piece inserted into the connection portion. A third aspect of the present invention is characterized in that, in the first or second aspect, the connection terminal is provided so as to remain within a formation region of the connection portion. A fourth aspect of the present invention is characterized in that, in the third aspect, the connection terminal is formed in a cylindrical shape.

[0006]

<Operation and Effect of the Invention><Invention of Claim 1> By using the rubber stopper, not only the lead wire but also the relatively hard connection portion can be well adhered and sealed. Further, since the periphery of the rubber plug is covered with a cover having high rigidity, the rubber plug is stably held even if the lead wire sways, and a reliable seal can be expected. <Invention of Claim 2> The cover itself is stably held because the insertion piece of the cover is inserted into the connection portion.

<Invention of Claim 3> For example, in the case where the connection terminal protrudes from the connection portion by insert molding, if the connection terminal does not protrude from the formation region of the connection portion and stays in the region, the connection is made. Die can be cut without bringing a parting line around the periphery of the part. Therefore, the outer periphery of the connection portion can be reliably formed on a smooth surface, and the rubber plug has excellent adhesion. <Invention of Claim 4> When the connection terminal is cylindrical, the mold structure can be simplified in preventing resin leakage into the connection terminal.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. In this embodiment,
An example of a coil device constituting a solenoid device will be described. As shown in FIGS. 1 and 2, the coil device of this embodiment
An exterior body 12 made of a synthetic resin is formed around the bobbin 11 around which the coil 10 is wound by molding, and the whole is formed in a ring shape. The connecting portion 14 is integrally protruded, and a lead wire 30 is connected to a connecting terminal 25 protruding from the connecting portion 14.

Next, the structure of the lead portion of the lead wire 30 will be described in detail. The connecting portion 14 protrudes from the exterior body 12 as described above. This connection part 14
As shown in FIGS. 3 to 5, the base has a base 15 which is flush with the outer peripheral surface of the exterior body 12 and has a predetermined thickness and width and is formed so as to protrude. A lightening 15A is formed on the upper surface of the base 15.

On the outer surface of the base portion 15, a receiving portion 16 having a rectangular shape is formed so as to protrude. This receiving part 16
Is formed at a position whose upper surface is lower than the upper surface of the base 15. The bottom of the receiving portion 16 is thicker with the bottom thereof aligned with the bottom of the base 15 on the inner side close to the base 15, and the bottom is raised and thinner on the outer side. As shown in FIG. 4, the bottom surface of the thick portion 16 </ b> A is formed with a pair of first caulking surfaces 18 with both ends formed obliquely, and the bottom surface of the thin portion 16 </ b> B is formed as a second caulking surface 19. Have been. In addition, on the upper surface between the base 15 and the receiving portion 16,
An insertion groove 21 having a predetermined depth is cut.

On the upper surface of the receiving portion 16, a fitting projection 23, which is slightly smaller, is formed. The fitting projection 23 has a rectangular shape with rounded corners, and its upper surface is slightly protruded from the upper surface of the base 15. A pair of mounting holes 24 are formed in the fitting projection 23 at predetermined intervals, and a connection terminal 25 protrudes from each mounting hole 24.

The connection terminals 25 are formed by pressing a conductive metal plate. As shown in FIG. 3, the connection terminal 25 has a cylindrical portion 26 into which the core wire 31 of the lead wire 30 can be fitted inside, and the seam 27 extends vertically on the outside (right side in FIG. 3) surface. Is formed, and a groove 28 for vertically dividing is cut in substantially the outer half circle at the substantially center height position.

The lower ends of the connection terminals 25 are respectively embedded in the mounting holes 24, and as shown in FIG. 3, L-shaped legs projecting from the lower end of the inner surface of the cylindrical portion 26. 29 faces the bobbin 11, and the tip of each leg 29
It is connected to both ends of the coil wire constituting the coil 10 described above. Note that the two connection terminals 25 are fixed to the bobbin 11 in advance as inserts when the exterior body 12 is formed, and the exterior body 12 and the connection portions 14 are formed, so that the connection terminals 25 are located slightly below the dividing grooves 28. It is arranged with the upper part protruding from it.

The fitting projection 23 in the connection section 14 described above.
, A rubber stopper 35 is fitted. As shown in FIG. 6, the rubber stopper 35 has a thick upper surface portion 36.
And a lip 37 is formed on the inner peripheral surface of the lower end of the fitting protrusion 2.
3 and can be fitted in close contact with the outer peripheral surface. Two bosses 38 are formed on the top surface of the upper surface 36 at the same interval as the interval between the two connection terminals 25, and an insertion hole through which the lead wire 30 is inserted at the center of each boss 38. 39 is formed through the lower surface of the upper surface portion 36, and a lip 40 is formed on the inner peripheral surface thereof.

A cover 41 for covering the outer periphery of the rubber stopper 35
Is provided. The cover 41 is formed by pressing a rigid metal plate. More specifically, as shown in FIG. 7, the rubber stopper 35 is formed in a substantially rectangular tube shape that can cover the entire height. A pair of first caulking pieces 42 project from both short sides of the lower edge of the cover 41, and a second caulking piece 43 projects from one long side. The lower edge of the long side on the opposite side is connected to the connection portion 14 described above.
Is an insertion edge 44 that can be inserted into the insertion groove 21. On the upper edge side of the cover 41, a pair of pressing pieces 45 are formed by being bent inward at a right angle in advance at the center in the width direction of both long sides.

This embodiment has a structure as described above,
Next, an example of an assembling procedure will be described. First, as shown in FIG. 8, the rubber stopper 35 is accommodated in the cover 41, and the two lead wires 30 are inserted into the corresponding insertion holes 39 of the rubber stopper 35 from above. Then, the tip of the lead wire 30 is peeled, and the core wire 31 is exposed. Next, the core wire 31 of the lead wire 30 is inserted into the upper end of the cylindrical portion 26 of the connection terminal 25, and the connection terminal 25 is crimped to the core wire 31 by caulking the upper end side of the cylindrical portion 26 as shown in FIG. Connected. At this time, since the cylindrical portion 26 is vertically divided by the groove 28, the caulking force is prevented from reaching the lower end side of the cylindrical portion 26, and the fitting protrusion 23 is prevented from being cracked.

Subsequently, the cover 41 accommodating the rubber stopper 35
When the insertion edge 44 is pushed down to the bottom of the insertion groove 21 when the insertion edge 44 is pushed down to the bottom of the insertion groove 21 as shown in FIG. Is stopped. At this time, the lower end of the rubber plug 35 housed in the cover 41 is fitted to the outside of the fitting projection 23. In addition, the second caulking piece 43 is in a state of hanging down outside the second caulking surface 19 as shown by a solid line in the figure, and the pair of first caulking pieces 42 are, as shown by a chain line in FIG. The first caulking surface 18 hangs outside.

Then, as shown by the solid line in FIG.
Both the first caulking pieces 42 are caulked toward the corresponding first caulking surface 18, and the second caulking piece 43 is caulked toward the second caulking surface 19, as shown by a chain line in FIG. 10. As a result, the cover 41 is fixed to the connecting portion 14 in a retaining state. Then, the inner circumference of the lower end of the rubber stopper 35 is in close contact with the outer circumference of the fitting projection 23 while crushing the lip 37, and
Similarly, the inner periphery of both insertion holes 39 of the rubber stopper 35
While being in close contact with the outer peripheral surface of the lead wire 30,
0 and the connection terminal 25, that is, the lead wire 30
The seal of the drawer portion is removed.

As described above, according to the present embodiment,
Since the rubber stopper 35 is used as the sealing member, the sealing member can be in good contact with the fitting projection 23 made of a relatively hard resin as well as around the lead wire 30 to obtain high sealing properties. A highly rigid cover 4 is provided around the rubber stopper 35.
1, the rubber plug 35 is stably held even if the lead wire 30 deflects, and the wall thickness of the rubber plug 35 is reduced by being covered with the rigid cover 41. Even if it is thin, the crushing allowance of the lip can be made large, so that the rubber stopper 35 can be kept small. Furthermore, since the cover 41 is attached by inserting the insertion edge 44 into the insertion groove 21, the holding force of the cover 41 itself is also excellent.

The connection terminal 25 has a cylindrical portion protruding from the fitting protrusion 23 and crimping the lead wire 30, and is provided in a state where the connection terminal 25 remains within the surface area of the fitting protrusion 23. For example, the portion for crimping the lead wire 30 is formed in an open barrel shape,
If it protrudes outside from the peripheral edge of the connection portion 25, it is difficult to remove the die when the connection portion 14 is formed using the connection terminal 25 as an insert. In this respect, in this embodiment, as described above, since the crimped portion of the connection terminal 25 is the cylindrical portion 26 and remains in the surface area of the fitting protrusion 23, the outer periphery of the fitting protrusion 23 Die cutting without bringing a parting line. Therefore, the outer periphery of the fitting projection 23 can be reliably formed on a smooth surface, and the rubber plug 35 has excellent adhesion. In addition, since the connection terminal 25 has a cylindrical shape, the mold structure can be simplified in preventing resin leakage into the connection terminal 25.

<Other Embodiments> The present invention is not limited to the embodiments described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) The cover is not limited to the metal plate illustrated in the above embodiment, and may be formed of another rigid plate material such as a hard synthetic resin plate.

(2) The assembling procedure is not limited to the above example. For example, before a connector or the like is attached to the other end of the lead wire, the lead wire is crimped to the connection terminal, and then the connection terminal is connected. The other end of the lead wire may be attached to the connection portion through a cover and a rubber plug. Instead of storing the rubber plug in the cover in advance, the rubber plug may be fitted first, and then the cover may be fitted again. (3) The present invention can be widely applied to all coil devices in which sealing means is provided at a lead wire lead-out portion.

[Brief description of the drawings]

FIG. 1 is a front view of a coil device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an exploded sectional view of a lead wire lead-out portion.

FIG. 4 is a front view showing a formation part of a connection part in the exterior body.

FIG. 5 is a plan view thereof.

FIG. 6 is a sectional view of a rubber stopper.

FIG. 7 is a perspective view of a cover.

FIG. 8 is a side cross-sectional view before crimping a lead wire to a connection terminal in an assembling operation.

FIG. 9 is a side sectional view showing a state where an electric wire is crimped;

FIG. 10 is a side sectional view showing a state where the cover is fitted to the fitting protrusion.

FIG. 11 is a sectional view seen from the front.

FIG. 12 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Coil 12 ... Outer body 14 ... Connection part 18, 19 ... Caulking surface 21 ... Insertion groove 23 ... Fitting protrusion 25 ... Connection terminal 26 ... Cylindrical part 30 ... Lead wire 31 ... Core wire 35 ... Rubber stopper 37 ... Lip 39 ... insertion hole 40 ... lip 41 ... cover 42, 43 ... caulking piece 44 ... insertion edge (insertion piece)

Claims (4)

[Claims] 1. A connecting portion is formed on an exterior body made of an insulating material in which a coil is accommodated, and a connecting terminal connected to the coil projects from the connecting portion, and a lead wire is connected to the connecting terminal. In the connection portion, a rubber stopper having an insertion hole through which the lead wire can be inserted in a liquid-tight manner is fitted to the connection portion, and a cover made of a highly rigid material that covers around the rubber stopper is provided. A coil device which is fitted. 2. The connector according to claim 1, wherein the cover is provided with an insertion piece inserted into the connection portion.
The coil device as described. 3. The coil device according to claim 1, wherein the connection terminal is provided in a region where the connection portion is formed. 4. The coil device according to claim 3, wherein the connection terminal is formed in a cylindrical shape.