JP2605415Y2 - Coil bobbins for electrical equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil bobbin for winding a coil of an electric device such as a stator coil of a motor or a transformer coil.

[0002]

2. Description of the Related Art Conventionally, as a coil bobbin, in order to prevent a gap from being formed between a flange portion on the winding start side of the coil and a coil wound on the first layer of the coil, a flange portion on the coil winding start side is used. A step extending over the entire circumference is provided at an annular corner formed between the cylindrical body and the cylindrical body, and the step is protruded radially outward from the outer peripheral surface of the body, and the step of the winding start part is protruded. Is set to 0 and the size of the protrusion at the end of winding is the same as the diameter of the coil (for example, Japanese Patent Application Laid-Open No. 61-196743).

[0003]

However, in the prior art, the coil is guided by the step portion in the first round of the coil, and then the coil is guided adjacently by the coil wound in the first round. The first coil is wound around the body, while the end of the first coil is wound along the folded side opposite to the winding start side to form the second step To get on the first coil and turn it back. At this time, the shape of the step portion provided on the flange portion on the winding start side sequentially affects, and the end of the first stage winding is similarly formed on the folded side flange portion in the same manner as when guided by the step portion. Since the coil is wound obliquely, there is a gap between the coil and the turn-back side flange portion, and the second-stage coil falls between the first-stage coils, resulting in winding defects. . Also, even if the step is provided at the annular corner formed by the folded side flange and the body, the coil diameter and the thickness of the insulating film vary, so that it is possible to completely prevent the occurrence of a gap. Had the problem of being difficult. The present invention automatically eliminates the gap between the coils due to variations in coil diameter, etc., and prevents the second-stage coil from dropping between the first-stage coils at the end of the first-stage turnback, and aligns the coils. It is an object of the present invention to provide a coil bobbin of an electric device that can perform winding.

[0004]

In order to solve the above problems, the present invention provides a tubular body for winding a coil,
In a coil bobbin of an electric device having an annular flange portion extending outward from outer peripheries of both end surfaces of the body portion, a folded side flange portion provided on a folded side end surface of a first layer coil of the body portion, some of the annular corner formed by the body part, have a slanted surface inclined toward the surface of the body portion from the folded side flange portion, and the coil
Is obtained so as to provide a protrusion for have a sloping surface inclined in the direction of winding.

[0005]

According to the above means, the coil of the first layer starts to be wound around the body portion, and the coil approaching the turn-up rides on the inclined surface of the projection even if a gap is formed between the coil and the coil wound immediately before. The coil is wound by sliding on the inclined surface by the tension at the time of winding and in contact with the coil wound immediately before, and the coil to be wound next is also tightly wound. When the coil is folded at the folded side flange portion and the second layer starts to be wound, since the gap in the first layer coil is eliminated, the second layer coil is wound without falling into the first layer.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 is a perspective view of a main part showing an embodiment of the present invention, in which a coil bobbin 1 is provided with an annular winding start side flange portion 3 extending outward from the outer periphery of an end surface on the winding start side of a cylindrical body portion 2 and is folded back. A similar folded side flange portion 4 is provided on the side end surface, and a winding start side flange portion 3 and a folded side flange portion 4 are provided.
In between, a coil is wound around the body 2. Part of the annular corner portion 5 formed by the folded side flange portion 4 and the body portion 2 has an inclined surface 61 inclined from the surface of the folded side flange portion 4 toward the surface of the body portion 2, and A projection 6 having an inclined surface 62 inclined in the direction in which the coil is wound is provided. FIG. 2A is a front view showing a state near the protrusion 6 when the coil 7 starts to be wound around the body 2, the first layer starts to be wound from the side flange portion 3, and is folded back at the folded side flange 4 side. And (b) is a plan view. The coil 7a approaching the return is the coil 7 wound immediately before.
b, the coil 7a rides on the inclined surfaces 61 and 62 of the protrusion 6 and slides on the inclined surfaces 61 and 62 by the tension at the time of winding, so that the coil 7a comes into contact with the coil 7b and is wound. The coil 7c to be wound and wound next is also wound in close contact with the coil 7a. FIGS. 3A and 3B are a front view and a plan view, respectively, showing the state near the protrusion 6 when the coil 7 is folded back at the folded side flange 4 and the second layer starts to be wound. The coil 7c is wound in contact with the turn-back side flange portion 4, and the next wound coil 7d is turned and the second layer is wound, but between the coils 7a and 7c and the coils 7a and 7b. Since the gap has disappeared, the coil of the second layer is wound without falling into the first layer. In addition, the protrusion is not limited to the one provided at one place of the annular corner part 5, and a plurality of protrusions may be provided as a whole, such as a body part having a quadrangular cross-section, such as one place at each side. .

[0007]

[Effect of the Invention] As described above, according to the present invention, 1
Coil, folded side franc was close to wrapping stage
A slope that slopes from the surface of the body toward the surface of the trunk,
Sliding in contact with the coil wound last by the projecting portion having an inclined surface inclined in a direction of winding the coil,
Since there is no gap between the adjacent coils, the second-stage coil does not fall between the first-stage coils, so that there is an effect that a coil bobbin of an electric device that can perform aligned winding can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of the present invention.

FIGS. 2A and 2B are a front sectional view of a main part and a plan view of a main part, respectively, showing a state of a coil according to the embodiment of the present invention;

FIGS. 3A and 3B are a front sectional view and a plan view, respectively, showing the state of the coil according to the embodiment of the present invention.

[Explanation of symbols]

1 Coil bobbin, 2 body, 3 winding start side flange, 4 folded side flange, 5 annular corner. 6 Projection, 61 62 Slope, 77a, 7b, 7c, 7
d coil

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical body for winding a coil,
In a coil bobbin of an electric device having an annular flange portion extending outward from outer peripheries of both end surfaces of the body, a folded-side flange portion provided on a folded-side end surface of a first-layer coil of the body, and some of the annular corner formed by the body part, have a slanted surface inclined toward the surface of the body portion from the folded side flange portion, and carp
Coil bobbin of electrical equipment, characterized in that a protruding portion that have a sloping surface inclined in the direction of winding the Le.