JP2002198217A - Coil unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coil unit where a coil can be wound stably into an aligned winding, even if the cylindrical part of a bobbin is formed into a stepped shape, so as to enable a solenoid actuator to be diminished in size and improved in performance. SOLUTION: A coil unit is composed of a bobbin B, which is installed with a cylindrical part 1 and flanges 4 and 5, provided to the ends of the cylindrical part 1 and a coil 9 which is wound on the cylindrical part 1 and provided with two ends that are led outside from the one of the flanges. The cylindrical part 1 is formed into a stepped cylinder composed of a cylinder 2, which is large in diameter and provided with one flange and a cylinder 3, which is small in diameter and provided with another flange, and a groove 7 that contains the coil 7 is cut in the outer periphery of the large cylinder 2, starting from the flange of the cylinder 2 and terminating at the outer periphery of the small cylinder 3, so as to enable the coil 9 to start being wound on the small cylinder first.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coil device used for various solenoid actuators such as a solenoid valve.

[0002]

2. Description of the Related Art A coil device of this kind is provided with a bobbin having a tubular portion and flanges provided at both ends of the tubular portion, and wound around the tubular portion, and both ends are taken out from one side of the flange. And a coil. FIG. 6 shows a bobbin in a conventional coil device. The bobbin has a cylindrical portion 11 having flanges 14 and 15 formed at both ends thereof, which is formed in a straight cylindrical shape so that its outer peripheral surface has the same diameter in the axial direction. The coils can be sequentially wound in the axial direction on the outer peripheral surface of the tubular portion 11 between the positions 15, so that the coils can be aligned and wound.

In recent years, in order to reduce the size and improve the performance of a solenoid actuator, a tubular portion of a bobbin is formed to be stepped in the axial direction, and a coil is wound around the stepped cylindrical portion. The coil device described in, for example,
No. 2,690,081.

[0004]

However, in the coil device disclosed in the above-mentioned publication, when both ends of the coil are taken out of the stepped tubular portion from the flange on the large diameter portion side, the outer periphery of the tubular portion is taken out. In the process of winding the coil from the large-diameter portion side, there is a problem that the coil is displaced at the step between the large-diameter portion and the small-diameter portion, and the winding state is disturbed. Further, after the coil is wound around the small-diameter portion and folded back on the flange on the small-diameter portion side, the coil is turned or jumped over at the stepped portion and becomes unstable, so that the winding state of the coil is disturbed.

[0005] Therefore, the present invention has been made in view of the above circumstances, and despite the fact that the cylindrical portion of the bobbin is formed in a stepped shape in order to reduce the size and improve the performance of the solenoid actuator. It is another technical object of the present invention to stably wind a coil and to form an aligned winding.

[0006]

Means taken to solve the above technical problems according to the present invention are: a bobbin having a cylindrical portion and flanges provided at both ends of the cylindrical portion; And a coil whose both ends are taken out from one side of the flange,
The tubular portion is formed in a stepped tubular shape having a large-diameter portion located on one side of the flange and a small-diameter portion located on the other side of the flange, and the coil is wound around the small-diameter portion. A groove extending from one of the flanges to the outer periphery of the small-diameter portion is formed on the outer periphery of the large-diameter portion so that the coil can be started, and can accommodate the coil.

According to the above-described means, the coil can be wound from the small diameter portion of the cylindrical portion, so that the coil shifts from the large diameter portion to the small diameter portion at the step between the large diameter portion and the small diameter portion. It does not fall and the winding state of the coil is disturbed.

In the above means, it is preferable that a projection for preventing the coil housed in the groove from falling off is provided at an opening edge of the groove. In the above means, the large-diameter portion and the small-diameter portion are wound such that the outer peripheral surface of the coil wound around the small-diameter portion a predetermined number of times and the outer peripheral surface of the large-diameter portion are on the same circle. Is desirably set.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a bobbin B of a coil device is made of resin and has a stepped cylindrical portion 1 around which a coil 9 (see FIG. 4) is wound. Flanges 4 and 5 are provided to regulate the winding position of the coil 9 in the axial direction.

The cylindrical portion 1 has a large-diameter portion 2 and a small-diameter portion 3 connected to the large-diameter portion 2 via a step portion 8. A fixing portion 4a is provided. On the outer peripheral surface of the large diameter portion 2, a groove 7 is formed which extends in the axial direction from the flange 4 toward the outer peripheral surface of the small diameter portion 3. The groove 7 has a depth and a width equal to or greater than the wire diameter of the coil 9. As shown in FIG. 3, the end of the groove 7 on the side of the step portion 8 is formed such that the depth of the groove 7 is gradually increased so that the bottom surface of the groove 7 is connected to the outer peripheral surface of the small diameter portion 3. It has become.

The end of the groove 7 on the flange 4 side is
And is communicated with a slit 6 insulated from a coil 9 wound around the tubular portion 1 by a partition wall portion 4b. The groove 7 is formed such that a protrusion 7 a is formed in the winding direction at the opening edge of the groove 7 on the side opposite to the winding direction (the direction of the arrow in FIG. 2) of the coil 9 in the circumferential direction of the cylindrical portion 1. The bottom of the groove is formed in the direction opposite to the winding direction with respect to the opening edge (the groove 7 is not formed radially of the cylindrical portion 1).

FIG. 4 is a schematic diagram when the coil 9 is wound in the sectional view of the embodiment shown in FIG. FIG.
As shown in the figure, the length H1 of the step of the step portion 8 is
Is an integral multiple (three times in FIG. 4) of the outer diameter d. still,
The length between the step portion 8 and the flange 5 and the length between the flange 4 and the flange 5 are also integral multiples of the outer diameter d of the coil 9.

In the present embodiment configured as described above, when the coil 9 is wound, the coil 9 on the winding start side connected to a terminal (not shown) fixed to the terminal fixing portion 4a.
Is guided to the outer periphery of the small-diameter portion 3 through the slit 6 and the groove 7 and wound around the outer periphery of the small-diameter portion 3 in the counterclockwise direction in FIG. The coil 9 is sequentially wound around the outer periphery of the small-diameter portion 3 from the step portion 8 toward the flange 5, and when it hits the flange 5, the coil 9 is wound toward the folded step portion 8 to form an aligned winding. As described above, after the outer diameter of the coil 9 wound on the outer periphery of the small-diameter portion 3 becomes equal to the outer diameter of the large-diameter portion 2 while turning between the step portion 8 and the flange 5 (in FIG. 3), the coil 9 is also wound around the outer periphery of the large-diameter portion 2, and the coil is wound a predetermined number of times while being folded between the flanges 4 and 5.

In the above-described bobbin of the present embodiment,
By accommodating the coil 9 on the winding start side in the groove 7 provided in the large diameter portion 2, the coil 9 on the winding start connected to the terminal of the flange 4 is wound around the outer periphery of the large diameter portion 2. Can be guided to the small-diameter portion 3 without contact with the small-diameter portion 3. As a result, the coil 9 can be wound from the small-diameter portion 3 of the tubular portion 1, so that the coil 9 is displaced from the large-diameter portion 2 to the small-diameter portion 3 at the step portion 8, and the coil 9 is wound without being disturbed. can do. Furthermore, since the protrusion 7a is formed in the groove 7 in the winding direction of the coil 9, the coil 9 at the beginning of winding guided to the groove 7 through the slit 6 is positioned by the protrusion 7a. The small diameter portion 3 is fixed and guided to the small diameter portion 3 without floating and falling off from the groove 7 and can be wound around the small diameter portion 3.

Since the length H1 of the step 8 of the step 8 is an integral multiple of the outer diameter d of the coil 9 (three times in FIG. 4), the coil wound around the outer periphery of the large diameter section 2 is formed. 9 is the same as the position of the coil 9 in the winding direction (the fourth round in FIG. 4) wound around the small-diameter portion 3, and the small-diameter portion 3 is a coil having a step difference of the step portion 8. After winding the wire 9, the wire can be stably wound without turning over at the stepped portion 8.

Next, a second embodiment of the present invention will be described. FIG. 5 shows a bobbin according to the second embodiment with a coil 9.
It is a schematic diagram at the time of winding. In the second embodiment shown in FIG. 5, the same components as those in the first embodiment are given the same reference numerals as FIG. 1 to FIG.

As shown in FIG. 5, on the outer periphery of the cylindrical portion 10, both the large-diameter portion 20 and the small-diameter portion 30 have coils 9 wound thereon.
A V-groove 11a is formed in accordance with 0. This V-groove 1
The groove depth h of 1a is 0.4 times the outer diameter d of the coil 90.

The length H2 of the step of the step 8 is H2 = d +
(√3) d (n-1) / 2, where n is the number of turns when the coil 9 is wound until the step H2 is filled, and in FIG. Since the coil H fills the step H2 in the third lap (that is, n = 3), H2 =
d + (√3) d, so that the position of the coil 90 wound around the outer periphery of the large diameter portion 20 in the winding diameter direction is the number of turns (the fourth rotation in FIG. 5) wound around the small diameter portion 30. The position is set to be the same as the position of the coil 90 in the winding diameter direction.

Therefore, the same effects as those of the first embodiment can be obtained in the second embodiment. Furthermore, the bobbin in the second embodiment has the effect that the coil 90 is wound along the V-groove 11a, so that the bobbin can be smoothly aligned and wound.

[0021]

As described above, according to the present invention, the coil can be wound stably despite the bobbin having the step formed in the cylindrical portion. As a result, the solenoid actuator can be downsized. In addition, performance such as suction force and responsiveness can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a bobbin of a coil device according to the present invention.

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

FIG. 3 is a sectional view of the groove 7 and the cylindrical portion 1 of the first embodiment taken along a central axis.

FIG. 4 is a schematic diagram when a coil is wound in the cross-sectional view of the first embodiment shown in FIG. 3;

FIG. 5 is a schematic diagram when a coil is wound around a bobbin of a coil device according to a second embodiment.

FIG. 6 is a sectional view showing an example of a bobbin of a conventional coil device.

[Description of Signs] 1 cylindrical portion 2 large diameter portion 3 small diameter portion 4, 5 flange 7 groove 7a projection 8 stepped portion 9 coil H1, H2 length of stepped portion

Claims (4)

[Claims] A bobbin having a tubular portion and flanges provided at both ends of the tubular portion; and a bobbin wound around the tubular portion,
In a coil device having both ends thereof, a coil taken out from one side of the flange, a large-diameter portion positioned on one side of the flange and a small-diameter portion positioned on the other side of the flange. The coil extends from one of the flanges to the outer periphery of the small diameter portion on the outer periphery of the large diameter portion so that the coil can start winding at the small diameter portion, and accommodates the coil. A coil device, wherein a possible groove is formed. 2. The coil device according to claim 1, wherein a protrusion for preventing the coil housed in the groove from falling off is provided at an opening edge of the groove. 3. A step between the large-diameter portion and the small-diameter portion so that an outer peripheral surface of the coil wound around the small-diameter portion a predetermined number of times and an outer peripheral surface of the large-diameter portion are on the same circle. The coil device according to claim 1, wherein the coil device is set. 4. A coil device comprising: a bobbin having a tubular portion and flanges provided at both ends of the tubular portion; and a coil wound around the tubular portion, wherein the tubular portion is formed of the flange. An outer peripheral surface of the coil formed in a stepped cylindrical shape having a large-diameter portion located on one side and a small-diameter portion located on the other side of the flange, and wound around the small-diameter portion a predetermined number of times. A step between the large-diameter portion and the small-diameter portion is set so that the outer peripheral surface of the large-diameter portion and the outer peripheral surface of the large-diameter portion are on the same circle.