JPH04348013A - Coil bobbin - Google Patents

Abstract

PURPOSE:To prevent an end part of a lead wire from dropping out and to hold the end part of the lead wire inside a lead wire containing groove stably by projecting a keep projection part radially to constrict a groove opening facing an end containing part of the lead wire containing groove part for containing the end part of the lead wire. CONSTITUTION:In an end containing part 29 of a lead wire containing groove part 2 which contains an end part of lead wires L3, L4, an end of a sidewall part 22 is provided with a keep projection part 5 toward radial inner direction. In the lead wire end part containing part 29, a keep projection part 6 is provided to an outer peripheral surface of a main tube part 1 facing the keep projection 5 toward radial outer direction. In the end containing part 29 of the lead wire containing groove part 2 which is constricted by the both keep projection parts 5, 6, radial width near an groove opening is formed narrower than an outer diameter of an insulating resin member applied to lead wires L3, L4 to be contained. Thereby, the end part of the lead wire can be held stably inside the lead wire containing groove part.

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 an improvement in the shape of the lead-out wire receiving groove.

0002

2. Description of the Related Art An example of a conventional coil bobbin is shown in FIG. This type of coil bobbin consists of a main cylinder part 1 made of thin resin that is open at both ends and around which the coil is wound, and a main cylinder part 1 made of thin resin that is surrounded along the outer circumferential surface of one end of the main cylinder part 1 and houses the lead wire. The lead wire accommodating groove portion 2 is provided. The outer circumferential shape of the main cylinder part 1 has various shapes such as a rectangular cylinder shape and a cylindrical shape, and the lead wire accommodation groove has a shape along the outer circumference of the main cylinder part 1. An example of a conventional lead wire accommodation groove 2 is shown in FIGS. 17 and 18.

The lead wire housing groove 2 includes a bottom plate portion 21 that stands radially outward from the entire outer periphery of one end of the main cylinder portion 1;
A side wall portion 22 extending outward from the tip of the bottom plate portion 21 parallel to the axis at a predetermined distance from the main cylinder portion 1, and a groove opening 23 opening outward parallel to the axis. have. The side wall portion 22 is provided with lead-out grooves d1 and d2 at predetermined locations for leading out the coil wires L1 and L2, and further has lead-out grooves d1 and d2 for leading out the coil wires L1 and L2.
, L4 into the inside of the lead wire accommodating groove 2 is provided. In addition, at the position of the lead-in groove d4, a lead wire support plate part 3 extends radially outward from the radial tip of the bottom plate part 21, and as shown in FIG. It is housed in 2. Further, approximately L-shaped pressing covers 31 and 32 are provided on both sides of the lead wire support plate portion 3, and the pressing covers 31, 32 are provided with approximately L-shaped pressing covers.
32 presses and holds the lead lines L3 and L4.

[0004] The lead line L3 to this lead line accommodation groove 2
, L4 are inserted into the lead wire support plate 3, and then inserted from the groove opening 23 into the lead wires L3, L4.
This is done by pushing in parallel to the axis. Other examples of the conventional lead wire accommodating groove portion 2 are shown in FIGS. 19 to 21. This lead wire accommodating groove part 2 is constructed by removing the side wall part 22 by approximately half the circumference from the above-mentioned lead wire accommodating groove part 2 in FIG. A triangular presser plate 4 is provided to prevent the lead wires L3 and L4 from coming off in the axial direction from the lead wire accommodation groove 2.

[0005] The lead wire L3 is inserted into the lead wire housing groove 2.
To insert L4, after inserting the lead wires L3 and L4 into the lead wire support plate 3, bend the lead wires L3 and L4 and insert them between the presser plate 4 and the bottom plate part 21, and then This is done by pushing the tips of L3 and L4 into the internal space from the groove opening 23 in the axial direction.

[0006]

[Problems to be Solved by the Invention] As can be seen from the above two examples, a problem that always arises in the production of coil bobbins is that the lead wires L3 and L4 connected to the coil wires L1 and L2.
The purpose is to stably hold the wire in the lead wire accommodation groove 2. When the lead wires L3 and L4 are displaced due to external force, impact, and vibration (vibrations include both external vibration and self-excited vibration due to the electromagnetic force generated by the self), the lead wires L3 and L4 are moved to the lead wire accommodation groove. 2, or the coil wires L1 and L2 connected to the lead wires L3 and L4 may be disconnected.

For example, in the case of the conventional examples shown in FIGS. 16 to 18, the lead wires L3 and L4 are stably held by the lead wire support plate 3 at the entrance of the lead wire accommodating groove 2, and Although displacement in the radial direction inside the wire accommodation groove 2 is suppressed by the side wall portion 22 of the leader wire accommodation groove 2, the leader wire L in the leader wire accommodation groove 2
3. L4 is the groove opening 23 side (i.e., one side in the axial direction)
If such a displacement is allowed, there is a possibility that the coil wires L1 and L2 will be disconnected.

[0008] In order to prevent such coil displacement,
Conventionally, the entire coil bobbin is molded with resin after the lead wires L3 and L4 are housed in the lead wire storage groove 2, but even in this case, the lead wires L3 and L4 are molded with resin during work such as when mounting the coil bobbin in a mold. L4 may be displaced or separated from the lead-out wire housing groove 2 in the axial direction, resulting in a mold defect. Further, the flow of the resin during resin injection may cause the lead wires L3 and L4 to be displaced or separated axially outward, causing the coil wires L1 and L2 to break or to cause mold defects.

[0009] In order to solve the above-mentioned problems, it has been implemented to adhere the lead wires L3 and L4 to the bottom plate part 21 with adhesive before resin molding, but due to the strict cost limit in coil bobbin production. Therefore, such an increase in the number of steps results in a major disadvantage. On the other hand, FIGS. 19 to 2
In the case of the conventional example shown in FIG. 1, the lead lines L3 and L4 are stably held by the lead line support plate part 3 at the entrance of the lead line accommodation groove part 2. In addition, within the lead wire accommodation groove 2, the parts of the lead wires L3 and L4 on the lead wire support plate part 3 side are prevented from separating outward in the axial direction by the presser plate 4, and the tips of the lead wires L3 and L4 are Since the portions are prevented from coming off in the radial outward direction by the side wall portion 22, retention of the lead wires L3 and L4 is improved compared to those in FIGS. 19 to 21.

However, even in this case, since the connection between the lead wires L3 and L4 and the coil wires L1 and L2 has to be carried out on the radially outer side of the lead wire accommodation groove 2, (
For example, see Figure 3), the connected lead wires L3, L
The tip portion of 4 is bent radially inward and inserted into the lead wire accommodation groove 2.
It is necessary to accommodate the bent lead wires L3, L
The tip portion of 4 tends to return radially outward due to its elasticity. Therefore, it is necessary to provide a side wall portion 22 in the portion of the lead wire accommodation groove 2 that accommodates the tip portions of the lead wires L3 and L4, and for this reason, a presser plate 4 is provided near the tip portions of the lead wires L3 and L4. Since it is not possible to provide a leader line L
3. The tip of L4 is still removable axially outward, and the effect of attaching the presser plate 4 is that the lead line L3
, it does not reach the tip of L4.

The present invention has been made in view of the above-mentioned problems, and provides a coil bobbin that can stably hold the tip of the lead wire in the lead wire accommodation groove despite various external forces and mold resin flow. The problem to be solved is to provide the following.

0012

[Means for Solving the Problems] The coil bobbin of the present invention includes a main tube made of thin resin that is open at both ends and around which a coil is wound, and a main tube that is surrounded along the outer peripheral surface of one end of the main tube. a bottom plate part, which is provided with a thin-walled resin-made lead wire accommodating groove in which the lead wire is accommodated, the lead wire accommodating groove part stands radially outward from the outer peripheral surface of the main cylinder part; and a tip end of the bottom plate part. A coil bobbin having a side wall portion extending in the axial direction at a predetermined distance from the main cylinder portion, and a groove opening opening in the axial direction, the tip portion of the leader wire being accommodated in the coil bobbin. It is characterized in that a presser protrusion is provided in the radially inward direction at the tip of the side wall facing the tip accommodating portion of the lead wire accommodating groove.

[0013] In a preferred aspect, the radial width of the groove opening is narrower than the outer diameter of the lead wire in the tip end accommodation portion of the lead wire accommodating groove. In one preferred aspect, the presser protrusion is obliquely provided in a tapered shape such that the height in the radial direction decreases from the groove opening toward the innermost part.

[0014]

According to the present invention, the leading end of the lead wire is prevented from being displaced in the radial direction by the main cylinder portion and the side wall portion, and is prevented from being displaced in the axial direction by the bottom plate portion and the holding projection. One end of the side wall part is supported by the bottom plate part so that it can be elastically deformed in the radial direction, so the end of the lead wire can be stored in the lead wire accommodation groove simply by pressing the lead wire into the groove opening. .

[0015]

As explained above, in the coil bobbin of the present invention, the holding protrusion is arranged so as to narrow the groove opening, facing the tip-end accommodating portion of the lead-out wire accommodating groove that accommodates the tip of the lead-out wire. Since it protrudes in the radial direction, the following effects can be achieved. The tip portion of the leader wire is prevented from exceeding the groove opening and leaving the tip portion accommodating portion of the leader wire accommodating groove portion in the axial direction outward. Originally, in the tip accommodation portion of the drawer line accommodating groove (the portion that accommodates the tip of the drawer line), the side wall prevents the tip portion of the drawer line from coming off in the radial direction. The distal end portion of the wire is prevented from coming off in both the radial and axial directions, and the distal end portion of the lead wire can be held extremely stably inside the lead wire housing groove.

[0016] Therefore, it is possible to prevent the tip portion of the lead wire (not electrically insulated) from protruding from the mold resin due to detachment of the tip portion of the lead wire from the lead wire accommodation groove or displacement in the axial direction. Can be done. Furthermore, it is possible to prevent the coil wire connected to the tip of the lead wire from being disconnected due to displacement of the tip of the lead wire.

[0017] Furthermore, since it is not necessary to bond the lead wire to the bottom plate portion with an adhesive, an increase in the number of steps can be prevented. Furthermore, even though the holding protrusion is provided in this way, the side wall part is structured so that one end is supported by the outer end of the bottom plate part, so when removing the lead wire housing groove from inside the mold, it is difficult to remove the lead wire. When pushing the wire into the lead-out wire accommodation groove, the bottom plate and the side wall easily deform elastically in the direction of expanding the groove opening, so these operations are not hindered.

[0018]

【Example】

Example 1 An example of the coil bobbin of the present invention will be described with reference to FIGS. 1 to 6. However, common functional elements are given the same reference numerals throughout this specification. As shown in FIG. 2, this coil bobbin consists of a thin, cylindrical main cylinder part 1 that is open at both ends and around which a coil is wound, and a lead wire that is surrounded along the outer peripheral surface of one end of the main cylinder part 1. It is provided with a thin lead wire accommodating groove portion 2 in which L3 and L4 are accommodated. The main cylinder part 1 and the lead wire housing groove part 2 are made of 6,6 nylon and are injection molded using a mold.

The lead wire housing groove 2 includes a bottom plate portion 21 that stands radially outward from the entire circumference of one outer peripheral end of the main cylinder portion 1, and a bottom plate portion 21 that extends from a predetermined portion of the outer end of the bottom plate portion 21 to the main cylinder portion 1. On the other hand, it has a side wall portion 22 extending axially outward at a predetermined interval, and a groove opening 23 opening axially outwardly. Side wall part 2
2 extends from the outer end of the bottom plate portion 21 located on the upper half side in FIG. 1, and is omitted from the outer end of the bottom plate portion 21 located on the lower half side in FIG. The side wall portion 22 is provided with lead-out grooves d1 and d2 at predetermined locations for leading out the coil wires L1 and L2 (see FIGS. 3 and 4), and further has lead-out grooves d1 and d2 for leading out the coil wires L1 and L2 (see FIGS. 3 and 4).
3. A lead-in groove d4 is provided for pulling L4 into the annular groove 24 inside the lead-out wire housing groove 2. Further, at the position of the lead-in groove d4, a leader line support plate part 3 extends radially outward from the outer end of the bottom plate part 21, and as shown in FIGS. 3 and 4, the leader lines L3 and L4 are It is accommodated in the accommodation groove part 2. Approximately L-shaped pressing covers 31 and 32 are provided on both sides of the lead wire support plate portion 3, and the pressing covers 31 and 32 press the lead wires L3 and L4.

Note that the side wall portion 2 adjacent to the drawer groove portion d2
A partition wall 28 that insulates the lead wires L3 and L4 from each other is provided from the main cylinder portion 2 toward the main cylinder portion 1. The features of this embodiment will be explained below. Tip part accommodating portion 29 of the leader line accommodating groove 2 that accommodates the tip parts of the leader lines L3 and L4
, a presser protrusion 5 is provided at the tip of the side wall portion 22 in a radially inward direction, and in this lead wire tip housing portion 29, the outer periphery of the main cylinder portion 1 facing the presser protrusion 5 is provided. A presser protrusion 6 is provided on the surface in a radially outward direction. In the tip housing portion 29 of the lead wire housing groove 2 narrowed by both presser projections 5 and 6, the radial width near the groove opening 23 is the same as the insulating resin coated on the lead wires L3 and L4 to be accommodated. It is formed narrower than the outer diameter of the member.

In this case, since the side wall portion 22 has a one-end support structure with the bottom plate portion 21 as the supporting end, by pushing the lead lines L3 and L4 into the groove opening 23, the side wall portion 2
2 is elastically deformed in the radially outward direction, and the lead wires L3 and L4 are easily accommodated in the interior 24. The lead wire wiring process including insertion of the lead wires L3 and L4 into the lead wire housing groove 2 is performed as follows.

[0022] The leader lines L3 and L4 are connected to the leader line support plate part 3.
After inserting the coil wires L1, L2 into
Similarly, extend the wires from the lead-out grooves d1 and d2 in the radially outward direction of the lead-out wire storage groove 2, peel off the enamel at the tips of the coil wires L1 and L2, and remove the copper wire portions (connection parts) at the tips of the lead-out wires L3 and L4. ) and apply solder to the connection part. Note that the coil wire L1 is drawn out through the drawing groove d2 (see FIG. 3).

Next, the connected lead lines L3 and L
4 is bent radially inward, then pressed axially inward and inserted into the lead wire accommodation groove 2 . At this time, the presser protrusion 5 opens radially outward due to the elasticity of the side wall portion 22, and the tip portions of the lead wires L3 and L4 are pushed beyond the groove opening 23 (see FIG. 4). In the coil bobbin of this embodiment described above, the lead wire L3 routed on the bottom plate portion 21
, L4 are prevented from being displaced in the axial and radial directions by the lead wire support plate 3 and the presser protrusions 5 and 6, so the bottom plate 21
The side wall portion 22 can be omitted on the lower half side in FIG. 1, and the work of accommodating the lead wire in the groove portion 2 can be easily automated.

Embodiment 2 Another embodiment will be explained with reference to FIG. In this embodiment, the side wall portion 22 of the tip end accommodating portion 29 of the lead wire accommodating groove portion 2 of the first embodiment is curved inward, and the tip thereof is used as the presser protrusion 5 according to the present invention. By doing this, the side wall portion 22 bends in the radially outward direction when the lead wires L3 and L4 are inserted, and returns in the radially inward direction after insertion to narrow the groove opening 23, so that the same effect as in the first embodiment can be obtained. can get.

Embodiment 3 Still another embodiment is shown in FIG. In this embodiment, the presser protrusions 5 and 6 described in Embodiment 1 are arranged alternately in the circumferential direction. Therefore, by doing this, it is possible to further improve the retention of the lead lines L3 and L4.

Embodiment 4 Still another embodiment of the present invention is shown in FIGS. 9 and 14. In this embodiment, the presser protrusion 6 is omitted from the coil bobbin of the first embodiment. As a result, the mold can be easily pulled out from the internal space 29 after coil bobbin molding.

An example of the mold is shown in FIG. To remove the coil bobbin from this mold, first remove the upper mold upward in the figure, and at the same time open the left and right molds to the left and right, respectively. Next, the bottom plate part 2 of the lead wire accommodation groove part 2 is
1 upwards in the figure and pull out the coil bobbin upwards. FIG. 13 shows the ejector pin before being pushed up, and FIG. 14 shows the ejector pin being pushed up. Unlike the main cylinder part 1, the side wall part 22 of the lead wire accommodation groove part 2 easily deforms elastically in the radially outward direction, so that the coil bobbin can be easily extracted.

Furthermore, in this embodiment, as shown in FIG. 10, the presser protrusion is obliquely provided in a tapered shape such that the height in the radial direction decreases as it goes from the groove opening 23 toward the inner deep part 24. Therefore, when the side wall portion 22 is elastically deformed in the outward radial direction as shown in FIG. 14, the intersecting angle between this tapered surface and the outer peripheral surface of the push-out pin becomes small, allowing the coil bobbin to be pulled out smoothly.

FIG. 11 shows the coil bobbin of FIG. 10 in which the outer circumferential surface of the tip end of the side wall portion 22 is also tapered 49 to further facilitate the elastic deformation of the presser protrusion 5. Example 5 Still another example of the present invention is shown in FIG. In this embodiment, in the coil bobbin of Embodiment 1, a side wall portion 22a is also provided in the middle portion of the lead wire accommodation groove portion 2, that is, between 3 and 29, and a pressing protrusion 51 is also provided on this side wall portion 22a. ing. In this way, even more
The ability to hold the lead wire in the groove is improved.

[Brief explanation of the drawing]

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

[Figure 2
] Its A-A line sectional view,

FIG. 3 is a front view of a coil bobbin showing connections between lead wires L3 and L4 and coil wires L1 and L2 in Example 1;

FIG. 4: Lead line L to the lead line accommodation groove 2 in Embodiment 1.
3. Front view of the coil bobbin showing the state in which L4 is accommodated;

FIG. 5 is a partially enlarged sectional view showing a radial cross section of the tip housing portion 29 of the lead wire housing groove 2;

FIG. 6 is a partially enlarged front view of the tip housing portion 29 of the lead wire housing groove 2;

FIG. 7 is a partially enlarged sectional view of the coil bobbin of Example 2;

[
FIG. 8 is a front view of the coil bobbin of Example 3,

FIG. 9 is a front view showing the coil bobbin of Example 4;

FIG. 10 Example 3
A sectional view of the main parts of the coil bobbin,

FIG. 11 is a sectional view of a main part of a coil bobbin in another embodiment,

[Fig. 12] Cross-sectional view of a coil bobbin mold,

[Fig. 13] Cross-sectional view of a coil bobbin mold,

[Fig. 14] Cross-sectional view of a coil bobbin mold,

[Figure 1
5] Front view showing the coil bobbin of Example 5,

[Figure 16
] Diagram showing a conventional coil bobbin,

FIG. 17 is a diagram showing a conventional coil bobbin,

FIG. 18 is a diagram showing a conventional coil bobbin,

FIG. 19 is a diagram showing a conventional coil bobbin,

[Figure 2
0] Diagram showing a conventional coil bobbin,

FIG. 21 is a diagram showing a conventional coil bobbin,

[Explanation of symbols]

1... Main cylinder part 2... Lead wire accommodation groove part 5... Presser protrusion 6... Presser protrusion
21...Bottom plate part 22...Side wall part 23...Groove opening
29...Tip housing part

Claims (4)

[Claims] 1. A main cylinder made of thin resin that is open at both ends and around which a coil is wound, and a main cylinder made of thin resin that is surrounded along the outer peripheral surface of one end of the main cylinder and in which a lead wire is housed. a bottom plate part that stands radially outward from the outer peripheral surface of the main cylinder part; In the coil bobbin, the coil bobbin has a side wall portion extending in the axial direction with a gap between the side walls and a groove opening opened in the axial direction, and a tip portion accommodating portion of the lead wire accommodating groove portion that accommodates the tip portion of the lead wire. A coil bobbin, characterized in that a presser protrusion is provided in a radially inward direction at the tip of the side wall facing the coil bobbin. 2. The coil bobbin according to claim 1, wherein the radial width of the groove opening in the tip end accommodating portion of the leader wire accommodating groove is formed to be narrower than the outer diameter of the leader wire. 3. The coil bobbin according to claim 1, wherein the presser protrusion is obliquely provided in a tapered shape such that the height in the radial direction decreases toward the innermost part from the groove opening. 4. The coil bobbin according to claim 1, wherein the presser protrusion is provided not only at the tip accommodating portion of the lead-out wire accommodating groove but also at the tip of the other side wall portion.