JPH05328651A - Coil bobbin - Google Patents

Abstract

PURPOSE:To perform an aligned winding for a coil bobbin accurately and easily starting from the first stage regardless of a thin conductor for coil. CONSTITUTION:A regulated groove 7 which is extended spirally is formed on an outer-periphery surface 6 (conductor-winding surface) of a cylindrical conductor-winding part 4, a cross section of the regulated groove 7 is approximately in semicircular shape, and then the width and the spiral pitch are made equal to the diameter of a conductor 3 which is wound on the conductor-winding surface 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel coil bobbin. More specifically, the present invention relates to a coil bobbin that forms a coil by winding a conducting wire, and provides a novel coil bobbin that can perform aligned winding accurately and easily from the first stage even if the conducting wire used is thin. Is what you are trying to do.

[0002]

2. Description of the Related Art A coil is formed by winding a predetermined number of turns of a wire on a coil bobbin made of an insulating material.
The winding is usually performed by a so-called "aligned winding", that is, a winding method in which adjacent windings in the axial direction of the coil bobbin are in close contact with each other.

FIG. 6 shows an example of a conventional coil bobbin.

The coil bobbin a includes a conductor winding portion c having a cylindrical outer peripheral surface b (only a part of the outer peripheral portion in the circumferential direction is shown in the drawing), and both ends of the conductor winding portion c in the axial direction. Disk-shaped flanges d, d protruding outward from the
(This also shows only a part in the circumferential direction.) And are integrally formed of an insulating material.

The outer peripheral surface b of the coil bobbin a is a wire winding surface, and a predetermined wire e is wound on the wire winding surface b by a predetermined number of turns.

That is, the conductor wire e is first wound around the entire conductor wire winding surface b in a spiral shape from one end to the other end in the axial direction, and so that the conductor wires e and e of each winding are also in close contact with each other. As it goes, the first-stage partial coil f-1 is wound.

[0007] Next, a substantially V formed on the outer peripheral side between the adjacent conductors e of the first-stage partial coil f-1.
By winding the conducting wire e so as to be positioned in the V-shaped spiral groove g, the second-stage partial coil f-2 is wound,
After that, the conducting wire e is repeatedly wound so as to be positioned in the substantially V-shaped spiral grooves g, g, ... Formed on the outer peripheral side between the conducting wires e of the preceding partial coils. Thus, the partial coil f-n at the final stage is wound to form the coil h.

[0008]

By the way, since the number of turns of the conductive wire e is an important factor for defining the electrical characteristics of the coil h, the conductive wire e needs to be wound as designed by the number of turns. Is the partial coils f-1, f-2,
The winding of f-n must be performed so that there is no gap between the windings.

In particular, in this case, the number of turns is regulated in the second and subsequent windings by limiting the winding position by the substantially V-shaped spiral grooves g, g, ... Formed by the partial coils in the previous stage. Therefore, the winding of the first stage is extremely important.

For this reason, the conductor wire e is usually wound with an appropriate tension applied so as not to cause slack.

However, when a thin wire e is used as the coil h is downsized, a strong tension cannot be applied to the wire e, so that the winding condition of the coil portion of the first stage becomes loose. When the second-stage coil portion is wound, the conductor wire of the second-stage coil portion may fall between the first-stage coil portion and the conductor wire of the first-stage coil portion, which causes a problem that accurate aligned winding cannot be performed. It was

Therefore, in such a winding state, it is not possible to accommodate a predetermined number of turns in a space of a predetermined size, so that a coil bobbin larger than a predetermined one must be used, and the coil h can be miniaturized. Could not be achieved.

In order to reduce the size of the coil h, it may be possible to wind the conductor wire e at a low speed. However, in this case, the productivity is lowered and the cost is increased. A new problem arises.

[0014]

In order to solve the above-mentioned problems, the coil bobbin of the present invention has a restricting groove extending in a spiral shape for restricting the winding position of the conductor on the outer peripheral surface of the conductor winding part. It was done.

[0015]

Therefore, according to the coil bobbin of the present invention, the winding position of the conductor with respect to the outer peripheral surface of the conductor winding portion is defined by the restriction groove, so that when the coil portion of the second stage is wound, the conductor is in the first stage. Since it does not fall between the conductors of the eye and can be accurately aligned and wound, this allows the conductors of the second and subsequent stages to be accurately aligned and wound. It is possible to store a predetermined number of turns in the space, minimize the number of conducting wires to be used, and wind the conducting wires at a high speed to some extent, thereby improving the production efficiency.

[0016]

The details of the coil bobbin of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

In the figure, reference numeral 1 denotes a coil, and a coil bobbin 2
And a conductive wire 3 wound around the coil bobbin 2.

The coil bobbin 2 has a flat cylindrical wire winding portion 4 having a short axial length for its diameter, and projecting outwardly from both ends of the wire winding portion 4 in the axial direction. The disc-shaped flanges 5 and 5 are integrally formed of an insulating material.

The cylindrical outer peripheral surface 6 of the conductor winding portion 4 is a conductor winding surface, and one regulating groove 7 extending spirally is formed on the conductor winding surface 6.

The cross-sectional shape of the regulation groove 7 is formed in a substantially semicircular shape, and its width w and spiral pitch p (see FIG. 3) are made equal to the diameter d of the conducting wire 3 (see FIG. 4).

In order to wind the conductor wire 3 around the coil bobbin 2, first, the conductor wire 3 is wound from one end of the conductor wire winding surface 6 along the restriction groove 7 while applying an appropriate tension.

The wound conductor wire 3 is guided by the inner surface of the restriction groove 7 and is positioned so that a substantially half portion thereof in the radial direction is accommodated in the restriction groove 7.

In this way, the first-stage partial coil 8-1 is wound, and the first-stage partial coil 8- is wound.
Each of the lead wires 8-1a, 8-1a, ...

When the first-stage partial coil 8-1 is formed in this manner, the conducting wires 8-1a, 8a are formed on the outer peripheral surface thereof.
-1a, ... Adjacent to each other, a substantially V-shaped spiral groove 9-1 is formed on the outer peripheral surface side of the spiral groove 9-1.
The formation pitch of -1 is also made equal to the diameter d of the conductive wire 3.

Next, on the first stage partial coil 8-1,
Wind the conducting wire 3 along the spiral groove 9-1 and 2
The partial coil 8-2 at the stage is formed.

In order to set the winding start position of the second stage partial coil 8-2 to the same side as the winding start position of the first stage partial coil 8-1, the first stage partial coil 8-1 is After the winding is finished, the conducting wire 3 again has the first-stage partial coil 8-1.
It is returned to the winding start side of.

By doing so, the winding directions of the first-stage partial coil 8-1 and the second-stage partial coil 8-2 can be made the same, and the first-stage partial coil 8-1 will be described later. The second-stage partial coil 8-2 can be wound around the V-shaped spiral groove 9-1 formed by forming the partial coil 8-1.

The conductors 8-2a, 8-2a, ... Of the second stage partial coil 8-2 are guided by the spiral groove 9-1 and are seated in the spiral groove 9-1. Therefore, the second-stage partial coil 8-2 is also aligned and wound, and a substantially V-shaped spiral groove 9-2 similar to the spiral groove 9-1 is formed on the outer peripheral surface side. To be done.

Further, the partial coils 8-3, 8 of the third and subsequent stages
-4, ..., 8-n, like the partial coil 8-2 of the second stage, overlaps with the partial coil of the preceding stage, and the spiral groove 9-2 formed by the partial coil of the preceding stage, 9-3,
It is formed by winding along 9-4, ....

In this manner, the coil bobbin 2 and the conductor 3
Are wound by a predetermined number of turns to form the coil 10.

However, in such a coil bobbin 2, when the first-stage partial coil 8-1 is formed, the position of the conductor 3 with respect to the conductor winding surface 6 is set by the restriction groove 7.
Conductors 8-1a, 8-1 of the first stage partial coil 8-1
Since a, ... Are regulated so as to be in close contact with each other, aligned winding can be easily performed.

FIG. 5 shows a modification 7A of the restriction groove 7.

The regulation groove 7A has a substantially V-shaped cross section, and its width and spiral pitch are formed in the same manner as the regulation groove in the first embodiment.

Even with such a regulation groove 7A, however, the winding position of the conductor wire can be regulated, and the conductor wire 8 can be accurately aligned and wound.

[0035]

As is apparent from what has been described above, the present invention is characterized in that the outer peripheral surface of the wire winding portion is formed with a spirally extending restriction groove for restricting the winding position of the wire. And

Therefore, according to the coil bobbin of the present invention, since the winding position of the conductor with respect to the outer peripheral surface of the conductor winding portion is defined by the restriction groove, when the coil portion of the second stage is wound, the conductor is in the first stage It does not fall between the conducting wire of the eye and the conducting wire can be accurately aligned,
As a result, the second and subsequent conductor wires can be accurately aligned and wound, so that a predetermined number of turns can be accommodated in the planned space, and the number of conductor wires used can be minimized and the conductor wires can be used. Can be wound at a high speed to some extent and the production efficiency can be improved.

In the above embodiment, the conductor winding portion has a cylindrical outer peripheral surface. However, the present invention is not limited to this, and the conductor winding portion has a rectangular or polygonal cross section. May be

In addition, the structures or shapes of the coil bobbin, the restriction groove, etc. shown in the above embodiments are merely examples of the embodiment in carrying out the present invention.
The technical scope of the present invention should not be limitedly interpreted by these.

In particular, the width of the restricting groove and the spiral pitch are not limited to the same as the diameter of the conductor wire, but it may be considered to be an integer multiple of 2 or more depending on the winding form of the conductor wire.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a coil bobbin of the present invention in which a part of a coil is cut away.

FIG. 2 is an enlarged side view showing a coil bobbin with a part cut away.

FIG. 3 is an enlarged sectional view showing a main part of a coil bobbin.

FIG. 4 is an enlarged cross-sectional view showing a main part of a coil bobbin on which a conductive wire is partially wound.

FIG. 5 is a cross-sectional view of a main part showing a modified example of the restriction groove.

FIG. 6 is a cross-sectional view of a main part showing an example of a conventional coil bobbin.

[Explanation of symbols]

 2 coil bobbin 3 conductor wire 4 conductor winding part 6 outer peripheral surface 7 restriction groove 7A restriction groove

Claims (1)

[Claims] 1. A coil bobbin characterized in that a spirally extending restriction groove for restricting a winding position of a conductive wire is formed on an outer peripheral surface of the conductive wire winding portion.