JPH05291022A - Coil bobbin - Google Patents

Abstract

PURPOSE:To obtain a coil bobbin with which the tip part of a lead wire can be held stably in a lead-wire housing groove in spite of various external forces and flow of molding resin. CONSTITUTION:The desplacement of the lead wires L3 and L4 in a lead wire housing groove in groove aperture direction is suppressed by a protruding pressing part 5 and a protruding holding part. Also, the displacement in groove aperture direction of the base part in the groove of the lead wires L3 and L4 is suppressed by the protruding pressing part 5a provided in the vicinity of the lead-in part of the lead wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil bobbin, and more particularly to improvement of the shape of a lead wire receiving groove portion thereof.

[0002]

2. Description of the Related Art An example of a conventional coil bobbin is shown in FIG. This type of coil bobbin includes a thin-walled resin main cylinder 1 having both ends opened and a coil wound around it, and a thin-walled resin drawer surrounded by an outer peripheral surface of one end of the main cylinder 1 to accommodate a lead wire. The wire receiving groove portion 2 is provided. The outer peripheral shape of the main cylinder 1 has various shapes such as a rectangular tube shape and a cylindrical shape, and the lead wire accommodating groove portion 2 has a shape along the outer circumference of the main cylinder 1.

An example of a conventional lead wire receiving groove portion 2 is shown in FIG.
Shown in. The lead wire accommodating groove portion 2 is provided with a bottom plate 21 erected radially outward from the entire outer circumference of one end of the main cylinder 1, and a bottom plate 21.
Has a side wall 22 extending outward from the tip of the main cylinder 1 in parallel to the main cylinder 1 at a predetermined distance, and a groove opening 23 opened outward parallel to the shaft core. ..

A coil wire L is provided at a predetermined position on the side wall 22.
Drawer grooves d1 and d2 for drawing out the lead wires L1 and L2 are provided, and a lead wire lead-in port d4 for drawing the lead wires L3 and L4 into the lead wire housing groove portion 2 is provided. Further, at the position of the lead wire lead-in port d4, a lead wire guide portion 3 extends radially outward from the radial tip of the bottom plate 21, and as shown in FIG. 18, the lead wires L3 and L4 are provided in the lead wire receiving groove portions. It is housed in 2. Further, substantially L-shaped pressing covers 31 and 32 are provided on both sides of the drawing line guide portion 3, and the pressing covers 31 and 32 are drawing lines L3 and L.
4 is pressed and held.

Lead wire L to the lead wire receiving groove portion 2
Inserting the lead lines L3 and L4 into the lead line guide portion 3, then inserting the lead lines L3 and L4 from the groove opening 23.
This is done by pushing 4 in parallel with the axis. FIG. 17 shows a state after the lead lines L3, 4 are pushed in. Leader line L
Coil wires L1 and L2 are wound around the exposed conductor wires at the tips of 3 and L4, and after pushing in the lead wires L3 and L4, the lead wires L3 and L4 and the coil wire L1 are inserted into the lead wire accommodating groove portion 2. A resin mold is generally used to fix L2 and strengthen the insulation.

Another example of the conventional lead wire receiving groove portion 2 is shown in FIG.
8 to 20. The lead wire accommodating groove portion 2 is shown in FIG.
6, the side wall 22 is removed from the lead wire accommodating groove portion 2 for approximately half the circumference, and in return, a triangular pressing plate 4 is provided from two locations on one outer peripheral end of the main cylinder 1 in the radial direction, and the lead wire accommodating groove portion 2 is provided. This prevents the lead lines L3 and L4 from coming off in the axial direction.

The lead wire L3 is inserted into the lead wire receiving groove portion 2,
To insert L4, after inserting the lead wires L3 and L4 into the lead wire support plate portion 3, the lead wires L3 and L4 are bent and inserted between the holding plate 4 and the bottom plate 21, and then the lead wire L
This is done by pushing the end portions of L3 and L4 from the groove opening 23 into the internal space in the axial direction.

[0008]

As can be seen from the above-mentioned prior art examples, the problem always present in the manufacture of the coil bobbin is that the lead wire L3 connected to the coil wires L1 and L2,
L4 is stably held in the lead wire receiving groove portion 2. When the lead lines L3 and L4 are displaced by an external force, impact, or vibration (vibration includes both external vibration and self-excited vibration due to an electromagnetic force generated by the self), the lead lines L3 and L4 are displaced.
4 is detached from the inside of the lead wire accommodating groove portion 2, or the coil wires L1 and L2 are connected to the lead wires L3 and L4.
May be disconnected.

For example, in the case of the conventional example shown in FIGS. 15 to 17, the lead wires L3 and L4 are stably held by the lead wire support plate portion 3 at the entrance of the lead wire accommodating groove portion 2, and Although the radial displacement inside the wire receiving groove portion 2 is suppressed by the side wall 22 of the lead wire receiving groove portion 2, the lead wire L in the lead wire receiving groove portion 2 is prevented.
3, L4 is the groove opening 23 side (that is, one side in the axial direction)
Can be displaced, and if such displacement is allowed, the coil wires L1 and L2 may be disconnected.

In order to prevent such coil displacement,
Conventionally, after the lead wires L3 and L4 are housed in the lead wire housing groove portion 2, the entire coil bobbin is resin-molded. However, even in this case, the lead wire L3 is attached at the time of work such as mounting the coil bobbin in the mold. L4 is the lead wire receiving groove 2
There may be a case where a mold failure occurs due to axial displacement or separation. Further, the lead wires L3 and L4 may be displaced or separated axially outward due to the flow of the resin during the resin injection, and the coil wires L1 and L2 may be broken or a molding defect may occur.

In order to solve the above problems, it has been practiced to bond the lead wires L3 and L4 to the bottom plate 21 with an adhesive in advance before the resin mold, but this is due to the severe cost limit in the coil bobbin production. Such an increase in the number of steps causes a great disadvantage. Meanwhile, FIGS.
In the case of the conventional example shown in (1), the lead wires L3 and L4 are stably held by the lead wire support plate portion 3 at the entrance of the lead wire housing groove portion 2. In addition, the lead wire receiving groove portion 2
Inside, the lead wire support plate portion 3 of the lead wires L3 and L4
The part on the side is restrained from coming off to the outside in the axial direction by the pressing plate 4, and the part on the tip of the lead lines L3, L4 is on the side wall 22.
Since the disengagement in the radial direction is suppressed by the
20. The retention properties of the lead lines L3 and L4 are improved as compared with those of FIG.

However, even in this case, the lead wires L3, L4 and the coil wires L1, L2 must be connected to each other outside the lead wire receiving groove portion 2 in the radial direction (see, for example, FIG. 3). Leader line L3 that has been connected,
The leading end portion of L4 must be bent radially inward to be housed in the lead wire housing groove portion 2, and the bent lead wire L3,
The tip portion of L4 tries to return to the radially outward direction due to its elasticity. Therefore, the side wall 22 is inevitably provided in the portion of the lead wire receiving groove portion 2 that houses the leading end portions of the lead wires L3 and L4, and for this reason, the holding plate 4 is provided in the vicinity of the tip portions of the lead wires L3 and L4. It is not possible, so the leader line L
The tip portions of 3 and L4 are still detachable to the outside in the axial direction, and the effect of attaching the pressing plate 4 is that the lead line L
It does not reach the tip of 3 and L4.

The present invention has been made in view of the above problems, and is a coil bobbin capable of stably holding the leading end of the lead wire in the lead wire receiving groove portion despite various external forces or mold resin flow. To provide a solution to the problem.

[0014]

A coil bobbin according to a first aspect of the present invention comprises a main cylinder made of a thin resin whose both ends are open and a coil is wound around the main cylinder, and a main cylinder is surrounded and drawn along an outer peripheral surface of one end of the main cylinder. A coil bobbin comprising: a lead wire accommodating groove portion made of a thin resin for accommodating a wire; and a leader wire guide portion extending radially outward from a leader wire inlet of the drawer wire accommodating groove portion and locking the leader wire, The lead wire accommodating groove portion is a bottom plate that is erected radially outward from the outer peripheral surface of the main cylinder, and a side wall that extends axially from the tip of the bottom plate at a predetermined distance from the main cylinder. The facing portion of the main cylinder that faces the side wall in the radial direction, the groove opening that opens in the axial direction, and the leading end accommodation portion of the leading wire housing groove portion that houses the leading end portion of the leading wire From the groove opening of the tip accommodation part to the shaft A leading end locking portion that prevents the leading wire from coming off in the opposite direction, and a pressing protrusion that is provided in the radial direction from the leading end of the side wall in the vicinity of the leading wire inlet of the leading wire accommodation groove. It is characterized by having.

The coil bobbin according to the second aspect of the present invention is a thin resin main cylinder in which both ends are open and a coil is wound, and a thin wall which is surrounded along the outer peripheral surface of one end of the main cylinder and accommodates a lead wire. In a coil bobbin provided with a resin-made lead wire accommodating groove portion, the leader wire accommodating groove portion is a bottom plate erected substantially radially outward from an outer peripheral surface of the main cylinder, and a tip of the bottom plate with respect to the main cylinder. A side wall extending in a substantially axial direction at a predetermined interval, a facing part of the main cylinder facing the side wall in a substantially radial direction, a groove opening opened in the axial direction, and a diameter from a tip part of the side wall. A pressing protrusion protruding inward, and a holding protrusion bulging radially outward from a predetermined position of the facing portion by a predetermined distance, the surface of which extends substantially in the axial direction. It has a feature.

[0016]

In the first invention, the lead wire is
At the three positions of the lead-out wire receiving opening of the lead-out wire receiving groove portion, the pressing projection in the vicinity thereof, and the lead-out wire tip end locking portion, the removal of the lead-out wire receiving groove portion from the groove opening in the axial direction is locked. Therefore, the leader line can be held very stably in the leader line accommodation groove.

In particular, the leader line can be accommodated in the portion of the holding protrusion by simply pushing the leader line into the groove opening adjacent to the holding protrusion, and the leader line can be easily accommodated. Can be prevented. That is, the leader wire is locked in the pressing projection by using the fact that the leader wire is pushed in from the groove opening of the leader wire accommodation groove portion, and thereby the side wall is elastically deformed in the radially outward direction, which is very simple. ..

In the second aspect of the invention, the leader wire in the leader wire accommodation groove portion is prevented from being displaced in the radial direction by the side wall and the facing portion, and is prevented from being displaced in the axial direction by the bottom plate and the pressing protrusion. Since the tip of the side wall is supported at one end by the bottom plate so as to be elastically deformable in the radial direction, the lead wire can be accommodated simply by pressing the lead wire into the groove opening.
In particular, according to the present invention, since the holding projection is bulged outward from the predetermined position in the circumferential direction of the facing portion by the predetermined distance in the radial direction and the outer peripheral surface thereof extends substantially in the axial direction, the following operational effects can be obtained. You can

(A) Since this coil bobbin has the pressing projection, the radial width of the groove opening (hereinafter referred to as the groove) defined by the radial distance between the radial inner end of the pressing projection and the outer circumference of the facing portion. The size of the opening width) is important. If this groove opening width is too narrow compared to the diameter of the lead wire,
When pushing the lead wire, the side wall has to be largely deformed in the radial direction, which requires a great deal of labor. On the other hand, if the groove width is too wide compared to the diameter of the lead wire, pushing of the lead wire will be easier, but the lead wire will easily separate from the groove opening.

In the present invention, since the holding projection is provided only at a predetermined position in the circumferential direction of the facing portion, the groove opening width is narrowed outside the holding projection. Therefore, when the lead wire is pushed in, if the lead wire portion located in the narrowed groove opening portion is mainly pushed in, the remaining portion of the lead wire can be pushed in easily, and the push-in operation is simplified. Further, the lead wire pushed in is sufficiently prevented from coming off the groove opening at the narrowed portion.

Further, when the lead wire is pushed into the narrowed portion of the groove opening, since the holding projection is small, it can penetrate into the insulating coating resin layer of the lead wire, and the required deformation (opening) amount of the side wall is reduced accordingly. Therefore, it becomes easier to push in. (B) Furthermore, the accuracy of the groove opening width is important for the above reason, but in order to obtain this accuracy, it is sufficient to grind and adjust only the surface of the mold for forming the holding projection, and the mold is manufactured. Will be much easier. If there is no holding protrusion,
Most of the outer peripheral surface of the facing part needs to be ground and adjusted.

(C) Furthermore, since the surface of the holding projection extends substantially in the axial direction, the die does not catch on the holding projection when the die is pulled out from the inside of the groove. Although the pressing protrusion does not hinder the die removal due to the opening of the side wall, the facing portion provided with the holding protrusion, that is, the tip of the main cylinder cannot be deformed in the radial direction. The above-described shape has a great effect on die removal.

Further, according to the first and second aspects of the present invention, it is possible to prevent the leader line from being ejected from the molding resin due to the detachment of the leader line from the leader line accommodating groove portion or the axial displacement. it can. Further, it is possible to prevent the coil wire connected to the lead wire from being broken due to the displacement of the lead wire. Further, since it is not necessary to bond the leader line to the bottom plate with an adhesive, it is possible to prevent an increase in the number of steps. In addition, even though the pressing protrusion is provided in this way, the side wall has a structure that is supported at one end by the outer end of the bottom plate, so when pulling out the lead wire accommodating groove portion from the inside of the mold and pulling out the lead wire. Since the bottom plate and the side wall are easily elastically deformed in the groove opening expanding direction when being pushed into the wire accommodating groove portion, these operations are not hindered.

[0024]

【Example】

Example 1 An example of the coil bobbin of the present invention will be described with reference to FIGS. However, in this specification, common functional elements are designated by the same reference numerals. As shown in FIG. 4, the coil bobbin has a thin, cylindrical main cylinder 1 having both ends opened and a coil wound around it, and lead lines L3, L4 surrounded by an outer peripheral surface of one end of the main cylinder 1. Is provided with a thin lead wire receiving groove portion 2 and a lead wire guide portion 3 that extends radially outward from the lead wire receiving opening d4 of the lead wire receiving groove portion 2 and locks the lead wire. The main cylinder 1, the lead wire accommodating groove portion 2 and the lead wire guide portion 3 are made of 6,6 nylon and are injection-molded using a mold.

As shown in FIG. 5, the lead wire accommodating groove portion 2 is formed mainly from a bottom plate 21 which is erected radially outward from the entire outer peripheral end of the main cylinder 1 and a predetermined portion of the outer end of the bottom plate 21. A side wall 2 extending outward in the axial direction at a predetermined distance from the cylinder 1.
2, 22a, and a groove opening 23 opened outward in the axial direction,
It has a facing portion 25 that is formed by the tip of the main cylinder 1 and faces the side walls 22, 22 a in the radial direction.

The side wall 22 extends from the outer end located on the upper half side of the bottom plate 21 in FIG. 1, and the side wall 22a is
In FIG. 1, the bottom plate 21 extends from the outer end located on the lower half side. A coil wire L is provided at a predetermined position on the side wall 22.
1, L2 (see FIGS. 3 and 4) Drawout groove d for drawing out
1, d2 are provided, and a lead wire receiving port d4 for leading the lead wires L3, L4 into the annular groove 24 inside the lead wire receiving groove portion 2 is provided. Further, at the position of the lead wire receiving port d4, a lead wire guide portion 3 extends radially outward from the outer end of the bottom plate 21. As shown in FIGS. 3 and 4, the lead wires L3 and L4 are connected to each other. It is housed in the housing groove 2. A pressure cover-3 is provided on both sides of the lead wire guide portion 3.
1, 32 are covered, and the pressing covers 31, 32 press the lead lines L3, L4.

The side wall 22 adjacent to the drawing groove portion d2
A partition wall 28 that insulates the lead lines L3 and L4 from each other is provided toward the facing portion 25. The characteristic part of this embodiment will be described below. Tip portion accommodation portion 29 of the lead wire accommodation groove portion 2 that accommodates the tip portions of the lead wires L3 and L4.
At the tip of the side wall 22, there is provided a holding projection 5 (leading wire leading end locking portion in the present invention) 5 inward in the radial direction. On the outer peripheral surface of the facing portion 25 facing the protrusion 5, a holding protrusion 6 (leader wire tip end locking portion in the present invention) is provided radially outward. The surface of the holding projection 6 is shown in FIG.
As shown in, it is formed parallel to the axial direction.

In the tip end accommodation portion 29 of the lead wire accommodation groove portion 2 which is narrowed by both the protrusions 5 and 6, the radial width in the vicinity of the groove opening 23 is the insulating resin applied to the lead wires L3 and L4 to be accommodated. It is formed smaller than the outer diameter of the member. Similarly, in the vicinity of the lead wire lead-in port d4 of the lead wire receiving groove portion 2 that holds the root portions of the lead wires L3 and L4 in the groove,
A pressing protrusion 5a is provided at the tip of the side wall 22a in the radial direction.

In this case, since the side walls 22 and 22a have a one-end supporting structure with the bottom plate 21 as a supporting end, the groove opening 2 is formed.
3 by pushing the lead lines L3 and L4 into the side wall 2
2, 22a are elastically deformed in the radially outward direction, leading lines L3, L
4 is easily accommodated in the groove interior 24. The leader line wiring process including the insertion of the leader lines L3 and L4 into the leader line accommodation groove portion 2 is performed as follows.

First, the leader lines L3 and L4 are inserted into the leader line guide portion 3, and then the root portions of the leader lines L3 and L4 are pushed into the leader line accommodating groove portion 2 at the position of the pressing protrusion 5a.
The lead wires L3 and L4 are temporarily locked to the coil bobbin. Next, the leading end portions of the lead wires L3 and L4 are extended outward in the radial direction of the lead wire receiving groove portion 2, and the coil wires L1 and L2 are extended in the radial outward direction of the lead wire receiving groove portion 2 from the lead grooves d1 and d2. The exfoliated tip portions of the coil wires L1 and L2 are wound around the copper wire portions (connection portions) at the tip portions of the lead wires L3 and L4, and solder is applied to the connection portions (see FIG. 3).

Next, the lead lines L3 and L4 which have been connected.
After being bent in the radial direction, it is pressed inward in the axial direction and inserted into the lead wire accommodating groove portion 2. At this time, the side wall 2
Due to the elasticity of 2, the pressing projection 5 opens radially outward, and the tip portions of the lead lines L3, L4 are pushed over the groove opening 23 (see FIG. 4). At this time, due to the narrowing of the groove opening by the pressing projection 5 and the holding projection 6, the lead wire is difficult to separate from the groove opening.

In the coil bobbin of this embodiment described above, the lead lines L3, L4 drawn around the bottom plate 21.
However, due to the lead wire support plate 3 and the protrusions 5, 6, 5a,
At the location, the lead wires L3 and L4 and the thin coil wire L1 connected to the lead wires L3 and L4, which are prevented from coming off or moving from the groove opening 23,
It is possible to prevent disconnection of L2 and lack of withstand voltage due to the molding resin.

The molding of this coil bobbin will be described below. An example of the mold is shown in FIG. In order to remove the coil bobbin from this mold, first, the upper mold is extracted upward in the figure, and at the same time, the left mold and the right mold are opened left and right respectively. Next, the bottom plate 21 of the lead wire accommodating groove portion 2 is pushed up by the push-out pin upward in the figure, and the coil bobbin is pulled out upward.

FIG. 9 shows a state before pushing up the push pin, and FIG. 10 shows a state during pushing up the push pin. The side wall 22 of the lead wire accommodating groove portion 2 is easily elastically deformed radially outward unlike the main cylinder 1, so that the coil bobbin can be easily extracted. Further, in this embodiment, as shown in FIG. 7, the pressing projection is obliquely provided in a tapered shape in which the height in the radial direction decreases from the groove opening 23 toward the groove inside 24. Therefore, when the side wall 22 is elastically deformed outward in the radial direction as shown in FIG. 10, the crossing angle between the tapered surface and the outer peripheral surface of the push pin becomes small, and the coil bobbin can be smoothly extracted.

Since the surface of the holding projection 6 extends in the axial direction, it does not hinder the die cutting. Embodiment 2 Yet another embodiment of the present invention is shown in FIGS. The coil bobbin of this embodiment is different from the coil bobbin of the first embodiment in that the holding projection 6 is provided so as to face the holding projection 5a, and further the partition 28a is provided instead of the holding projection 5 and the holding projection 6 of the first embodiment. The point is characteristic.

The partition wall 28a radially blocks the lead wire accommodating groove 24, and the partition wire 28a has a lead wire distal end insertion hole 28b. The leading end of the lead wire connected to the coil wire is the lead wire tip insertion hole 28b.
Through. By doing so, there is an advantage that each lead wire can be supported at three points as in the coil bobbin of the first embodiment.

[Brief description of drawings]

FIG. 1 is a front view showing a coil bobbin of Example 1,

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a front view of a coil bobbin showing connection between the lead wires L3 and L4 and the coil wires L1 and L2 in the first embodiment;

FIG. 4 is a front view of the coil bobbin showing a state in which the lead wires L3 and L4 are housed in the lead wire housing groove portion 2 in the first embodiment;

FIG. 5 is an enlarged sectional view of an essential part showing a radial cross section of the lead wire accommodating groove portion 2;

FIG. 6 is an enlarged front view of a main portion of the lead wire accommodating groove portion 2,

FIG. 7 is an enlarged sectional view of an essential part showing a radial cross section of the lead wire accommodating groove portion 2;

FIG. 8 is a sectional view of a coil bobbin molding die;

FIG. 9 is a cross-sectional view of a coil bobbin molding die,

FIG. 10 is a sectional view of a coil bobbin molding die;

FIG. 11 is a front view of a coil bobbin of Example 2,

FIG. 12 is a sectional view taken along line AA of the coil bobbin of Example 2,

FIG. 13 is an enlarged front view of the main parts of the coil bobbin of the second embodiment,

14 is a cross-sectional view taken along line BB of the coil bobbin of Example 2,

FIG. 15 is a sectional view showing a conventional coil bobbin,

FIG. 16 is a front view showing a conventional coil bobbin,

FIG. 17 is a front view showing a conventional coil bobbin,

FIG. 18 is a front view showing a conventional coil bobbin,

FIG. 19 is a front view showing a conventional coil bobbin,

FIG. 20 is a cross-sectional view of essential parts showing a conventional coil bobbin,

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main cylinder 2 ... Lead wire accommodating groove part 5 ... Pressing projection 5a ... Pressing projection 6 ... Holding projection 21 ... Bottom plate 25 ... Confronting part 22 ... Side wall 23 ... Groove opening 29 ...
Tip accommodation part

Claims (2)

[Claims] 1. A thin-walled resin main cylinder having openings at both ends and around which a coil is wound, and a thin-walled resin lead wire surrounded by an outer peripheral surface of one end of the main cylinder to accommodate a lead wire. A coil bobbin including a housing groove portion and a leader wire guide portion that extends radially outward from a leader wire inlet of the leader wire housing groove portion and locks the leader wire, wherein the leader wire housing groove portion is an outer periphery of the main cylinder. A bottom plate standing radially outward from the surface, a side wall extending axially from the tip of the bottom plate at a predetermined distance from the main cylinder, and a main cylinder facing the side wall in the radial direction. And the groove opening that is opened in the axial direction, and the leading end of the lead wire is provided in the leading end housing portion of the leading wire housing groove portion that houses the leading end of the leading wire, and the leading end of the leading wire is the groove opening of the leading end housing portion. Leader wire tip to prevent axial disengagement from A coil bobbin, comprising: a portion locking portion; and a pressing projection portion that is provided in the vicinity of the drawing wire inlet of the drawing wire housing groove portion so as to project radially inward from the tip end portion of the side wall. .. 2. A thin-walled resin main cylinder having openings at both ends and around which a coil is wound, and a thin-walled resin lead wire surrounded by an outer peripheral surface of one end of the main cylinder to accommodate a lead wire. In a coil bobbin including a housing groove portion, the lead wire housing groove portion includes a bottom plate that is erected substantially radially outward from an outer peripheral surface of the main cylinder, and a predetermined distance from the tip of the bottom plate to the main cylinder. A side wall extending substantially in the axial direction, a facing part of the main cylinder facing the side wall in a substantially radial direction, a groove opening opened in the axial direction, and a radially inward direction from the tip of the side wall. A coil bobbin comprising: a projecting presser projection; and a holding projection that is bulged radially outward from a predetermined position of the facing portion by a predetermined distance and the surface of which extends substantially in the axial direction. ..