JP2001006918A - Electromagnetic coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent short-circuit and disconnection of a copper wire by providing a constitution in which a lead wire holder for winding a copper wire around a bobbin flange and a closed groove for guiding the copper wire are provided. SOLUTION: A bobbin 1 of an electromagnetic coil is provided with flanges 2a, 2b at both ends thereof, and the flange 2a is formed with a semicircle portion 2c and a substantially trapezoidal portion 2d connected to the semicircle portion. In order to wind the copper wire around the bobbin 1, the copper wire which is connected to one lead wire holder 4a is wound around a wound shaft 1a of the bobbin 1 starting from beneath the flange 2a to above the flange 2b and repeating this both-way winding until the required length of the wire is wound around, followed by connecting the copper wire to the other lead wire holder 4b at the right side. Specifically, as a closed groove 5 which extends from an outer periphery 2d of the flange to the wound shaft 1a is provided outside of square holes 3a, 3b, the copper wire at the winding start portion is wound around the bobbin 1 through the closed groove 5 and a protrusion 7 serving as a guide. After a predetermined length is wound, the copper wire is fixedly connected to the lead wire holder 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electromagnetic coil used for an electromagnetic valve or a motor-operated valve.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned electromagnetic coil is formed by winding a copper wire having a length necessary for generating a magnetic force on a resin bobbin,
A lead wire is connected to the end of the copper wire, and after processing this, the entire electromagnetic coil is resin-molded and attached to an electromagnetic valve or an electric valve.

[0003]

Here, as shown in FIGS. 5 and 6, the bobbin 21 has flange portions 2 at both ends.
2 and 22 are provided. The flange portion 22 is a semicircular portion 2
21 and a trapezoidal part 222 connected thereto, and the trapezoidal part 222 is provided with lead wire holders 23, 23.

In order to wind the copper wire 24 around the bobbin 21,
As shown in FIGS. 7 and 8, the copper wire connected to one lead wire holder 23 starts winding the copper wire 24 around the winding shaft 25 of the bobbin 21 from the end, and winding between the flange portions 22, 22. After reciprocating and winding the required length, a copper wire is connected to the other lead wire holder 23.

However, when the copper wire 24 is wound around the bobbin 21, the copper wire 24 extending from the lead wire holder 23 toward the winding shaft 25 of the winding bobbin 21 along the flange portion 22 of the bobbin 21. The copper wire 24 wound around the bobbin 21 may be rubbed, and the insulating coating of the copper wire may be scratched. In the worst case, a short circuit occurs.

In order to eliminate this inconvenience, as shown in FIGS. 7 and 8, a blind groove 26 is provided between both lead wire holders 23 of the flange portion 22 of the bobbin 21, and the lead wire is inserted into the blind groove 26. A copper wire connected to the holder 23 was inserted, and an attempt was made to eliminate the above-mentioned problem. However, the opening 2 of the bag groove 26
7, the copper wire 24 passes through in a state where the copper wire 24 is not supported, and when the whole electromagnetic coil is subsequently formed by resin molding, the copper wire 24 in an unsupported state may be disconnected due to the viscosity due to the molding pressure and molding temperature of the resin. Further, the copper wire 24 wound around the bobbin 21 becomes full, and the copper wire 24 at the end of the winding toward the lead wire holder 23 after the predetermined winding is completed is formed into the blind groove 2.
6 and cross the groove 2 in the same way as the copper wire
In some cases, the unsupported portion was formed in 6, and when the entire electromagnetic coil was subsequently molded with resin, the copper wire 24 was sometimes disconnected due to viscosity due to molding pressure and molding temperature of the resin.

[0007]

SUMMARY OF THE INVENTION The present invention is to provide a means for solving the problem of short-circuiting due to scratches of a copper wire when wound around a bobbin and disconnection of the copper wire in a resin molding process.

In order to solve the above-mentioned problems, the present invention provides a bag groove outside of both lead wire holders of a bobbin flange portion, and guides a copper wire which has started to be wound between the bag groove and the lead wire holder. The protruding portion is provided so that the copper wire at the beginning of winding does not come into contact with another copper wire. This allows
Unsupported part of copper wire may occur in blind groove,
A short circuit between the copper wire at the beginning of winding and another copper wire does not occur, and when the entire electromagnetic coil is molded with resin, disconnection of the copper wire due to viscosity due to molding pressure and molding temperature of the resin is prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the bobbin 1 is provided with flange portions 2a and 2b at both ends. The flange portion 2a is formed in a semicircular portion 2c and a substantially trapezoidal portion 2d connected thereto. Substantially trapezoidal portion 2d of upper flange portion 2a
Are provided with two square holes 3a and 3b, into which the base ends of the lead wire holders 4a and 4b are inserted.
a, 4b are fixed. Further, the winding shaft 1 of the bobbin 1 extends from the flange outer peripheral portion 2e of the substantially trapezoidal portion 2d of the upper flange portion 2a.
A groove 5 extending to a is provided outside the square hole 3a. A projection 7 is provided between the blind groove 5 and the lead wire holder 4a to guide the copper wire at the beginning of winding into the blind groove 5.

In order to wind the copper wire 6 around the bobbin 1, the copper wire 6 connected to the one lead wire holder 4a on the left side shown in FIGS. Is wound from the lower side of the upper flange portion 2a, is reciprocated while winding up to the upper side of the lower flange portion 2b, and is wound to a required length, and then the other lead wire holder 4b on the right side
To the copper wire 6. At this time, since the blind groove 5 extending from the flange outer peripheral portion 2d to the winding shaft portion 1a is provided outside the square holes 3 and 3, the copper wire 6 at the start of winding passes through the blind groove 5 and the protrusion 7 Is wound around the bobbin 1 with a guide, and a copper wire is wound around a predetermined length to be fully wound, and the copper wire is connected and fixed to the lead wire holder 4b to form an electromagnetic coil.

In the above embodiment, the copper wire 6 connected to the one lead wire holder 4a on the left side starts winding the copper wire 6 around the winding shaft 1a of the bobbin 1 from below the upper flange 2a. The copper wire is connected to the other lead wire holder 4b on the right after reciprocating while winding up to the upper side of the lower flange portion 2b and winding the necessary length. The wire 6 is connected, and the copper wire 6 is wound around the winding shaft portion 1a of the bobbin 1 from the lower side of the upper flange portion 2a. After that, a copper wire may be connected to the left lead wire holder 4a. In that case, the bag groove 5 is provided outside the square hole 3b.

[0012]

The present invention is configured as described above,
There is no unsupported portion of the copper wire in the blind channel.
In addition, there is no short circuit between the copper wire at the beginning of winding and another copper wire, and when the entire electromagnetic coil is molded with resin, the copper wire is not broken by the molding pressure of the resin.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view taken along line aa of FIG. 1 of the bobbin according to the embodiment of the present invention.

FIG. 3 is an enlarged view showing a portion A in FIG. 1;

FIG. 4 is an enlarged view showing a portion B in FIG. 2;

FIG. 5 is a front view showing a bobbin having a conventional bag groove.

FIG. 6 is a cross-sectional view taken along line bb of FIG. 5 of a conventional bobbin having a blind groove.

FIG. 7 is an enlarged view showing a portion C in FIG. 5;

FIG. 8 is an enlarged view showing a portion D in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bobbin 2 Flange part 3a, 3b Square hole 4a, 4b Lead wire holder 5 Bag groove 6 Copper wire 7 Projection

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Uchimura 535 Sasai, Sayama City, Saitama Prefecture Inside the Sayama Works Sayama Plant (72) Inventor Ken Sato 535 Sasai, Sayama City, Saitama Prefecture Sagami Works Sayama Works F Term (reference) 5E048 AB01 CB03 CB05

Claims (4)

[Claims] 1. An electromagnetic coil comprising: a lead wire holder for winding a copper wire around a flange portion of a bobbin; and a bag groove for guiding the copper wire. 2. The electromagnetic coil according to claim 1, wherein a projection for guiding a copper wire is provided in the blind groove. 3. The electromagnetic coil according to claim 1, wherein the bag groove is provided outside a lead wire holder. 4. The bag groove is set so that the copper wire at the beginning of winding does not contact another copper wire.
Electromagnetic coil according to any of the above