JP2003297625A - Coil device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the manufacturing cost of a coil device to a low level. <P>SOLUTION: A body 14 of the coil device is constituted of a bobbin 12, wound with a coil 11 and an external body 13 formed around the bobbin 12 by molding. In the external body 13, a plate-shaped fixture 40 is buried in a forwardly and backwardly protruded state. The fixture 40 is inserted into the external body 13, when the body 13 is molded. Through a yoke 30 attached to the rear side of the main body 14, a fixture groove 33, through which the fixture 40 is made to pass at the time of attaching the yoke 30 to the body 14, is formed. The portion of the fixture 40, made to protrude backward from the yoke 30, is formed as a locking section 42. When the locking section 42 is locked to the yoke 30 by bending the section 42, the yoke 30 can be fixed to the body 14. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coil device.

[0002]

2. Description of the Related Art Conventionally, as an example of a coil device mounted on an automobile, for example, one disclosed in JP-A-3-41224 is known. In this device, a coil wound around a bobbin is housed in an annular housing recess provided in a metal yoke. As a means for fixing the bobbin and the yoke, a caulking piece is provided on the opening edge portion of the housing recess of the yoke,
The bobbin is fixed by caulking the caulking piece after accommodating the bobbin in the accommodating recess.

[0003]

By the way, the yoke is
Although it is formed into a desired shape by cutting out a metal material, forming a complicated shape such as the caulking piece described above takes time and labor, and there is a problem that the manufacturing cost becomes high. there were. The present invention has been completed based on the above circumstances, and an object thereof is to keep manufacturing costs low.

[0004]

As a means for achieving the above object, the invention of claim 1 is such that a coil body formed by molding an outer package around a bobbin around which a coil is wound is made of metal. The fixing to the holding member is characterized in that the exterior body is integrally provided with a fixing member for fixing the holding member.

According to a second aspect of the present invention, in the first aspect of the present invention, a partition portion is provided between the fixing member and the bobbin of the exterior body to partition the both in a liquid-tight manner. However, it has a feature.

A third aspect of the present invention is characterized in that, in the first or second aspect, the fixing member is inserted when the outer casing is molded. .

According to a fourth aspect of the present invention, in any one of the first to third aspects, the fixing member is provided with an engaging portion for engaging with the holding member. The locking portion is characterized in that it is formed by deforming a part of the fixing member while supporting the holding member at a position where it can be fixed.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a screw portion is threadedly formed on the fixing member, and the screw member is screwed into the screw portion. It is characterized in that the holding member can be fixed by a possible screw body.

[0009]

<Advantages and effects of the invention><Invention of claim 1> Since the fixing member for fixing the holding member to the coil body is integrally provided on the resin outer casing, the metal holding member is provided as in the conventional case. Since it is not necessary to form the holding member in a complicated shape in order to provide the caulking piece (corresponding to the fixing member) on the member side, the manufacturing cost can be kept low.

<Invention of Claim 2> Even if a liquid enters between the exterior body and the fixing member, the partition prevents the liquid from entering the bobbin side. As a result, it is possible to maintain high sealing performance for the coil.

<Invention of Claim 3> Since the fixing member is inserted at the time of molding the exterior body, the number of working steps is reduced as compared with the case where the fixing member is assembled after the molding, and the cost is further reduced. Can be realized.

<Invention of Claim 4> Since the locking portion is formed by deforming a part of the fixing member, the number of parts can be reduced, and the holding member can be easily fixed. Cost can be reduced.

<Invention of Claim 5> Since the holding member can be screwed to the coil main body by screwing the screw body into the threaded portion of the fixing member, the holding member can be firmly fixed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. <First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. Coil device 1 of the first embodiment
0 is a part of the solenoid device,
As shown in FIG. 2, the bobbin 12 around which the coil 11 is wound.
The coil body 14 formed by molding the outer casing 13 around the is fixed to the metal yoke 30. In addition, below, let the left side in FIG. 2 be the front, and let the right side be the back.

The bobbin 12 is made of a synthetic resin, and as shown in FIGS. 1 and 2, is formed in a generally annular shape as a whole. 16 and a rear wall portion 17 are provided so as to project. Around the cylindrical portion 15, for example, a coil made of a copper wire is wound many times to form the coil 11. A pair of substantially L-shaped connection terminals 18 are press-fitted and held on the upper rear surface of the rear wall portion 17 in the drawing, and both ends of the coil 11 are connected to the coil connection pieces 18a of both connection terminals 18, respectively. There is.

The exterior body 13 is made of synthetic resin and is formed in a substantially annular shape while covering the entire area of the bobbin 12. From the upper rear surface of the outer casing 13, a connecting portion 19 protruding along both the connecting terminals 18 is provided. Both connection terminals 18,
A lead wire connecting piece 18b is provided which protrudes upward from the connecting portion 19 and is crimp-connected to the core wire of the lead wire W connected to an external circuit. The lead wire W and the connection portion 19 are fitted with a rubber plug G for tightly adhering to the lead wire W and the connection portion 19, and a metal cover C is attached to the rubber plug G.
Is exterior. A substantially cylindrical anti-rotation protrusion 20 is provided on the lower rear surface of the outer casing 13 so as to protrude rearward.

The yoke 30 has a flat plate shape having a thickness of about 1/3 of the outer casing 13 by cutting out a metal material.
Further, it is formed in a substantially annular shape having an inner diameter smaller than the outer casing 13 and an outer diameter larger than the outer casing 13. This yoke 30
It is attached to the coil body 14 from the rear and is fixed by a plate-like fixing fitting 40 described later. A connection portion insertion groove 31 for inserting the connection portion 19 is cut out and formed in the upper portion of the yoke 30. In the lower part of the yoke 30, a rotation stop hole 32 capable of internally fitting the rotation prevention protrusion 20 of the exterior body 13 is formed so as to penetrate therethrough in the front-rear direction.
By fitting the two together, relative displacement of the coil body 14 and the yoke 30 in the circumferential direction is restricted.

Now, the exterior body 13 is integrally provided with a plate-like fixing metal fitting 40 for fixing the yoke 30.
The plate-like fixing metal fitting 40 is made of a rectangular metal plate as the exterior body 13.
It is formed in an arc shape along the peripheral surface of, and is embedded in the exterior body 13 by being inserted when the exterior body 13 is molded. Plate-shaped fixing bracket 40 in the circumferential direction
Four of them are arranged in the exterior body 13 at positions spaced by an angle of approximately 45 degrees with respect to the rotation preventing projection 20 and the connecting portion 19, and between the plate-like fixing metal fittings 40, approximately 90 are provided. There are angular intervals of degrees. Each plate-shaped fixing bracket 4 in the radial direction
No. 0 is arranged in a portion of the exterior body 13 inside the bobbin 12 at a substantially central position in the radial direction. The portion of the exterior body 13 arranged between the plate-shaped fixing metal fitting 40 and the bobbin 12 serves as a partition portion 21 that partitions the plate-shaped fixing metal fitting 40 and the bobbin 12 in a liquid-tight manner.

A resin flow hole 41 for allowing a molten resin material to flow when the exterior body 13 is molded is formed in the approximate thickness center of the portion of each plate-shaped fixing member 40 to be embedded in the exterior body 13. It is formed so as to penetrate in the direction. After molding,
By locking the solidified resin material to the hole edge of the resin flow hole 41, the plate-like fixing metal fitting 40 is held in a state in which it is prevented from slipping back and forth from the exterior body 13.

Each of the plate-shaped fixing fittings 40 protrudes forward and backward from the exterior body 13, and the part protruding rearward is inserted into a metal fitting insertion groove 33 formed in the yoke 30 attached from the rear side of the exterior body 13. In addition, the yoke 30 is further projected rearward from the attached yoke 30 (FIG. 4). Then, the yoke 3 of the plate-like fixing member 40
The locking portion 42 is formed by bending the portion projecting rearward from 0 toward the outside (FIG. 6). By locking the locking portion 42 to the yoke 30, the yoke 30 can be fixed to the exterior body 13 in an unremovable manner in the front-rear direction. Four metal fitting insertion grooves 33 are provided such that a portion of the inner peripheral edge of the yoke 30 corresponding to each plate-shaped fixing metal fitting 40 penetrates in the front-rear direction and opens inward. Further, the side edge of the portion of the plate-shaped fixing fitting 40 arranged in the fitting insertion groove 33 is locked to the peripheral side of the fitting insertion groove 33, so that the yoke 30 can be prevented from rotating with respect to the coil body 14. (Fig. 3).

Next, an example of a method of manufacturing the coil device 10 will be described. First, the coil 11 is attached to the cylindrical portion 15 of the bobbin 12.
Is wound, and both connection terminals 18 are press-fitted and held on the bobbin 12. After pulling out both ends of the wound coil 11 and crimping or welding to the coil connecting pieces 18a of the both connecting terminals 18, the outer casing 13 is set in a molding die for molding. At this time, four plate-like fixing fittings 40 are set in predetermined positions in the molding die.

In this state, the molten resin material is filled in the molding die. The filled resin material passes through the resin flow hole 41 of the plate-like fixing metal fitting 40, and evenly spreads inside and outside the plate-like fixing metal fitting 40. When the mold is opened when the resin material is solidified, the coil body 14 in which the outer casing 13 is molded around the bobbin 12 is taken out. Coil body 14
As shown in FIG. 1 and FIG.
2 is covered over the entire area, and each plate-like fixing metal fitting 40
Is inserted into the exterior body 13 at a position where the partition 21 is separated from the bobbin 12. After that, both lead wires W are crimped to the lead wire connecting pieces 18b of both connecting terminals 18, and the rubber plug G and the cover C are attached.

After that, the work of fixing the yoke 30 to the coil body 14 is performed. First, the yoke 30 is attached while being aligned in the circumferential direction from the rear of the coil body 14.
At this time, as shown in FIGS. 3 and 4, a portion of each plate-shaped fixing metal fitting 40 that protrudes rearward from the exterior body 13 is inserted into each metal fitting insertion groove 33, and the detent protrusion 20 prevents rotation. The connection portion 19 is fitted in the hole 32, and the connection portion 19 is further inserted into the connection portion insertion groove 31. As a result, the coil body 1
The yoke 30 is positioned in the circumferential direction so that it can be fixed to the yoke 4. With the front surface of the yoke 30 in contact with the rear surface of the exterior body 13, a portion of each plate-like fixing metal fitting 40 that protrudes rearward from the yoke 30 is caulked by a predetermined jig, and is bent and deformed outward respectively. Let As shown in FIGS. 5 and 6, each locking portion 42 thus formed is locked to the rear surface of the outer peripheral edge of the metal fitting insertion groove 33 of the yoke 30. As a result, the yoke 30 is fixed to the coil body 14 in a state in which the yoke 30 cannot be relatively displaced in the front-rear direction and the circumferential direction. At this time, since the locking portions 42 of the plate-shaped fixing fittings 40 are locked with respect to the yoke 30 at four positions at substantially equal intervals in the circumferential direction, the yoke 30 is firmly fixed.

As described above, according to this embodiment,
Since the plate-like fixing metal fitting 40 for fixing the coil body 14 to the yoke 30 is integrally provided on the synthetic resin exterior body 13, the yoke is provided to provide the caulking piece on the metal yoke as in the conventional case. The manufacturing cost can be kept low as compared with the case where the is molded into a complicated shape.

Further, since the partition 21 is liquid-tightly partitioned between the plate-shaped fixing member 40 and the bobbin 12, liquid temporarily invades between the plate-shaped fixing member 40 and the exterior body 13. Even if you do, the liquid is
This prevents the bobbin 12 from entering the side. As a result, it is possible to maintain high sealing performance for the coil 11.

Further, since the plate-like fixing metal fitting 40 is inserted when the outer casing 13 is molded, the number of working steps is reduced as compared with, for example, the case where the plate-like fixing metal fitting is assembled after molding. Further cost reduction can be achieved. Further, the plate-like fixing metal fitting 40 can be firmly held in a state in which it does not come off from the exterior body 13.

Moreover, since the locking portion 42 is formed by deforming a part of the plate-like fixing metal fitting 40, for example, as compared with the case where the yoke is fixed by assembling another part to the plate-like fixing metal fitting. The number of parts and the number of assembly steps can be reduced, and the yoke 30 can be easily fixed.
Further cost reduction can be achieved.

<Second Embodiment> A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a cylindrical fixing member is embedded in the exterior body.

The columnar fixing member 50 is made of a substantially columnar metal rod and is inserted when the outer casing 13 is molded around the bobbin 12. As shown in FIG. 7, the cylindrical fixing member 50 is provided on the bobbin 1 of the exterior body 13.
It is arranged at a position sandwiching the partition portion 21A between the front and rear sides, and both front and rear ends project from the exterior body 13, respectively.
A constricted portion 51 having a partially reduced diameter is provided around the center of a portion of the cylindrical fixing member 50 which is embedded in the outer casing 13. In this constricted portion 51, the exterior body 1
When the resin material forming 3 is locked, the cylindrical fixing fitting 5
0 is retained in the front and rear retaining state in the exterior body 13. On the other hand, the yoke 30 is formed with a metal fitting insertion hole 34 through which a portion of the columnar fixing metal fitting 50 protruding rearward from the outer casing 13 is inserted.

To fix the yoke 30 to the coil body 14, the yoke 30 is attached from the rear of the coil body 14 while being aligned in the circumferential direction. At this time, the portion of the columnar fixing member 50 that projects rearward from the outer casing 13 is inserted into the metal fitting insertion hole 34, and is arranged so as to project rearward from the yoke 30 as shown in FIG.
Of the cylindrical fixing member 50, the protruding portion from the yoke 30 is hit from the rear side to be crushed, or is heated and melted to be deformed, and an umbrella-shaped locking portion 52 is formed as shown in FIG. . The locking portion 52 has an outer diameter dimension larger than that of the metal fitting insertion hole 34, and is locked to the rear surface of the yoke 30 (the hole edge of the metal fitting insertion hole 34). As a result, the yoke 30 is fixed to the coil body 14. In addition, other structures, actions and effects are the same as those of the first embodiment.
Since it is the same as the embodiment, the duplicated description will be omitted.

<Third Embodiment> A third embodiment of the present invention will be described with reference to FIG. 10 or FIG. In the third embodiment, a bolt is embedded in the outer casing and the yoke is fixed by a nut screwed with the bolt.

As shown in FIG. 10, the bolt 60 has a structure in which a threaded portion 61 is threadedly formed on the rear portion of a substantially cylindrical metal rod, and is inserted when the exterior body 13 is molded. The bolt 60 projects forward and backward from the exterior body 13, and a nut 62 can be screwed into a screw portion 61 that projects rearward from the exterior body 13. A constricted portion 63 similar to that of the second embodiment is provided in a portion of the bolt 60 which is embedded in the outer casing 13, and the bobbin 12 is provided.
A partition portion 21B is provided between and.

To fix the yoke 30, the coil body 1
The yoke 30 is attached from the rear of 4 and the yoke 3
The bolt 60 is inserted into the bolt insertion hole 35 which is formed to penetrate the hole 0. The nut 62 is screwed from the rear to the portion of the threaded portion 61 protruding rearward from the yoke 30.
As shown in FIG. 1, the yoke 30 can be fastened and fixed to the coil body 14. In this way, the yoke 30 can be screwed to the coil body 14 by the nut 62 that is screwed into the screw portion 61 of the bolt 60.
0 can be firmly fixed with high holding power. The other structures, operations, and effects are the same as those in the above-described first embodiment, and a duplicate description will be omitted.

<Fourth Embodiment> A fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, after the outer casing is molded, the female screw body is assembled to the outer casing.

The female screw body 70 is made of metal, and as shown in FIG. 12, the entire body is formed in a substantially cylindrical shape, and a male screw body 73 can be screwed onto its inner peripheral side (not shown).
Is threaded. On the other hand, on the rear surface of the exterior body 13,
A housing cylinder portion 22 is provided so as to project rearward so that the female screw body 70 can be fitted therein and housed therein. The housing cylinder portion 22 is arranged to overlap the bobbin 12 in the radial direction. Further, the yoke 30 is formed with an accommodating cylinder part insertion hole 36 for inserting the accommodating cylinder part 22 therethrough. A plurality of piece portions 71 are formed by forming slits in the front portion of the female screw body 70, and an expansion plate (not shown) in which each piece portion 71 is fitted.
Due to this, it is possible to expand and deform. On the outer peripheral surface of each piece portion 71, a mesh-like biting portion 72 that bites into the inner peripheral surface of the accommodation cylinder portion 22 is provided by expanding and deforming each piece portion 71 in the accommodation cylinder portion 22. ing. As a result, the female screw body 70
Can be retained in the retaining state with respect to the exterior body 13. Further, a portion of the exterior body 13 arranged between the female screw body 70 accommodated in the accommodation cylinder portion 22 and the bobbin 12 is a partition portion 21C.

To fix the yoke 30, the coil body 1
After attaching the yoke 30 from the rear of 4, press plate 7
4 and the washer 75, the male screw body 73 is screwed into the threaded portion of the female screw body 70. Then, the pressing plate 74 is held by the male screw body 73 while being locked to the rear surface of the yoke 30, so that the yoke 30 can be fastened and fixed to the coil body 14. The other structures, operations, and effects are the same as those in the above-described first embodiment, and a duplicate description will be omitted.

<Other Embodiments> The present invention is not limited to the embodiments described above and the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition to the above, various modifications can be made without departing from the scope of the invention. (1) In the above-described embodiment, the fixing member that is separate from the outer casing is provided integrally with the outer casing, for example. However, when the outer casing is molded, for example, Alternatively, an elastic locking piece that can be elastically locked may be formed by resin molding, and such a structure is also included in the present invention. (2) The number of fixing members and the position of arrangement with respect to the coil body are
It can be set arbitrarily.

[Brief description of drawings]

FIG. 1 is a plan view of a coil body according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG. 1 relating to a coil body and a yoke.

FIG. 3 is a plan view showing a state in which a yoke is attached to the coil body.

FIG. 4 is a sectional view taken along line XX of FIG.

FIG. 5 is a plan view showing a state in which a locking portion is bent.

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

FIG. 7 is an enlarged sectional view of a coil body and a yoke according to a second embodiment of the present invention.

FIG. 8 is an enlarged sectional view showing a state in which a yoke is attached to the coil body.

FIG. 9 is an enlarged cross-sectional view showing a state in which a locking portion is molded.

FIG. 10 is an enlarged sectional view of a coil body and a yoke according to a third embodiment of the present invention.

FIG. 11 is an enlarged cross-sectional view showing a state in which a yoke is fixed by a nut screwed with a bolt.

FIG. 12 is an enlarged cross-sectional view showing a state in which a yoke is fixed to a coil body according to a fourth embodiment of the present invention.

[Explanation of symbols]

10 ... Coil device 11 ... Coil 12 ... Bobbin 13 ... Exterior body 14 ... Coil body 21, 21A, 21B, 21C ... Partition section 30 ... Yoke (holding member) 40 ... Plate-shaped fixing bracket (fixing member) 42 ... Locking part 50 ... Cylindrical fixing bracket (fixing member) 52 ... Locking part 60 ... Bolt (fixing member) 61 ... screw part 62 ... Nut (screw body) 70 ... Female screw body (fixing member) 73 ... Male screw body (screw body)

Claims (5)

[Claims] 1. A method for fixing a coil main body formed by molding an exterior body around a bobbin wound with a coil to a metal holding member, wherein the exterior body is for fixing the holding member. A coil device, wherein a fixing member is integrally provided. 2. The coil device according to claim 1, wherein a partition portion is provided between the fixing member and the bobbin in the exterior body to partition the both in a liquid-tight manner. 3. The coil device according to claim 1, wherein the fixing member is inserted when the outer casing is molded. 4. The fixing member is provided with a locking portion which is locked to the holding member, and the locking portion supports a holding member at a position where the holding member can be fixed and a part of the fixing member. It is shape | molded by deform | transforming. 1.
The coil device according to claim 3. 5. A screw part is formed on the fixing member by threading, and the holding member can be fixed by a screw body that can be screwed into the screw part. The coil device according to any one of claims 1 to 4.