JPH04357461A - Method for assembling device with coil - Google Patents

Abstract

PURPOSE:To prevent breakage of a coil by providing a proper allowance between a sealed portion for a lead terminal of a coil terminal and a coil main body. CONSTITUTION:When assembling a device with a bobbin, a coil 2 which is wound around this bobbin 1, and a lead terminal 7 which is fitted to the bobbin, a terminal 2a of the coil 2 is tied up to a first portion 19 of the lead terminal 7 and then tied up to a second portion 20. Then, the coil terminal 2a is sealed to the second portion 20 by a solder 21, thus enabling a tension relaxation operation based on tie-up of a first portion 19 to be generated between a sealed portion of the coil terminal 2a and a main body portion of the coil 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a device having a coil, such as a rotation sensor device for detecting rotational or moving speed by changes in reluctance (magnetic resistance).

0002

2. Description of the Related Art Rotation sensors are already in use, which are composed of a permanent magnet, a core, and a coil, and detect the rotational speed of a magnetic gear based on changes in the induced voltage in the coil corresponding to changes in reluctance. This rotation sensor includes a bobbin, a coil wound around the bobbin, a core inserted into a hollow part of the bobbin, a permanent magnet magnetically coupled to the core, and a coil terminal implanted in the bobbin. and a lead terminal connected thereto.

0003

[Problem to be Solved by the Invention] By the way, it is not possible to simply connect the terminal of the coil to the lead terminal and solder it.
There was little margin for the terminal conductor between the soldered part of the terminal and the main body of the coil, and there was a risk that the terminal conductor would break due to vibration or shock. Furthermore, when resin molding is used, there is a risk that the coil terminal wire may be cut due to this expansion or contraction.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an assembly method that can easily provide an appropriate margin for the end of the coil.

[0005]

[Means for Solving the Problems] To achieve the above object, the present invention includes a bobbin, a coil wound around the bobbin, and a lead terminal attached to the bobbin and connected to an end of the coil. In the method for assembling a device, after the end of the coil is tied to the first part of the lead terminal, the end of the coil is also tied to a second part separated from the first part, and then The present invention relates to a method for assembling a device having a coil, characterized in that at least a part of the terminal end wrapped around the second portion is soldered to the lead terminal.

As described in claim 2, the lead terminal is kept inserted halfway into the groove of the bobbin, the end of the coil is connected to the lead terminal in this state, and then the lead terminal is further inserted. can do. In this case, it is preferable that the coil end is tied separately to the first and second parts of the lead terminal, and the coil end is fixed to only the second part with solder, as in claim 1.

[0007]

According to the method of claim 1, the tangled portion of the coil end relative to the first portion provides a margin to the coil end and exhibits a buffering effect. That is, since it is practically impossible to wind the coil terminal around the first portion of the lead terminal without loosening, a tension-relieving effect on the terminal occurs due to this loosening. In the method of claim 2, a margin corresponding to the distance from the intermediate position to the final position of the lead terminal is given to the coil terminal.

[0008]

Embodiment Next, a rotation sensor device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

As shown in FIG. 5, the rotation sensor device includes a bobbin 1, a coil 2, a magnetic core 3, a permanent magnet 4, a yoke 6, a pair of lead terminals 7, and a metal protective case 8. and a sealing resin 9, and is formed so that the reluctance changes in response to the rotation of a magnetic gear (not shown) facing the core 3, and the induced voltage of the coil 2 changes.

The bobbin 1 includes a cylindrical portion 10, an upper flange portion 11, and a lower flange portion 12, and is made of synthetic resin. Upper flange-like part 1
1 has a pair of protrusions 13.

[0011] The pair of protrusions 13 are located at the flange-like portion 11.
It protrudes upward from the upper surface of the cylindrical portion 10, that is, in the direction in which the cylindrical portion 10 extends. A groove 14 for inserting a pair of terminals 7 is formed in each of the pair of protrusions 13 . Furthermore, two protrusions 15 are provided on the outer circumferential surface of each pair of protrusions 13. The convex portion 15 is formed into a strip, as shown in FIGS. 3 and 7, and its tip 15a has a slope. Before inserting the bobbin 1 into the case 8 , the diameter of the circle inscribed with the convex portion 15 is slightly larger than the inner diameter of the case 8 . Further, the diameter of the outer circumferential surface of the bobbin 1 in the portion where the convex portion 15 is not provided is smaller than the inner diameter of the case 8. Since the bobbin 1 is made of synthetic resin, the two opposing protrusions 13 are slightly elastically deformed. Therefore, when the bobbin 1 is inserted into the case 8, the protrusion 15 is pressed by the inner peripheral surface of the case 8, and the pair of protrusions 13 are elastically deformed so as to approach each other, and the bobbin 1 is inserted into the case 8. At this time, convex portion 1
Since the tip 15a of the bobbin 1 is a sloped surface, the bobbin 1 can be inserted smoothly.

The groove 14 for inserting the terminal 7 has an opening 16 in the center as shown in FIGS. 2 and 3.
It is divided into two parts by 6. Therefore, the portion covering the groove 14 is elastically deformable and elastically holds the terminal 7. That is, when the chamfered tapered tip of the terminal 7 is inserted into the groove 14, the portion covering the groove 14 is elastically deformed to hold the terminal 7.

A space for arranging the permanent magnet 4 is provided inside the pair of protrusions 13 of the bobbin 1. In order to make it possible to insert the disk-shaped permanent magnets 4 from a direction perpendicular to the direction in which the terminals 7 extend in FIG. Note that the opposing interval between the pair of magnet introduction surfaces 17 is somewhat larger than the diameter of the permanent magnet 4. Furthermore, a planar, arcuate magnet positioning surface 18 is provided inside each of the pair of protrusions 13 . This positioning surface 18 is a surface that receives the permanent magnet 4 when the permanent magnet 4 is inserted from the direction of the arrow in FIG.

The pair of lead terminals 7 are formed of metal plates and have first and second end barring portions 19 and 20, respectively. The terminal end 2a of the coil 2 wound around the cylindrical portion 10 of the bobbin 1 has first and second terminal hooked portions 19, 2.
It is divided into 0 parts and wound a plurality of times, and only the end of the second end binding portion 20 is fixed to the terminal 7 with solder 21. Therefore, a plurality of coil terminals 2 for the first portion 19
The Karaage of a is connected to the coil terminal of the second part 20 and the coil 2.
It has the effect of providing a margin between the main body and the terminal, thereby preventing the terminal from being cut.

When connecting the terminal 2a of the coil 2 to the terminal 7, the terminal 7 is press-fitted halfway into the groove 14, and the terminal 2a of the coil 2 is connected to the first and second terminal barbed portions 19, 2.
0, and after fixing the terminal 2a of the coil 2 to the second terminal barbed portion 20 with solder 21, the terminal 7 is inserted into the groove 1.
Press in to the final position of 4. As a result, appropriate loosening occurs between the coil body wound around the cylindrical portion 10 of the bobbin 1 and the fixing portion of the end 2a attached to the terminal 7, thereby preventing wire breakage.

To explain how to assemble this rotation sensor device, first, the coil 2 is wound around the bobbin 1. Next, the coil terminal 2a is connected to the terminal 7. Next, the cylindrical core 3 is inserted into the hollow portion of the cylindrical portion 10 of the bobbin 1. Next, the permanent magnet 4 and the yoke 6 are inserted between the pair of protrusions 13 from the lateral direction. Note that the core 3, the permanent magnet 4, and the yoke 6 can be attached before the terminal 7 is attached or the coil end 2a is connected to the terminal 7. Next, the sensor main body, to which the coil 2 and other members are attached to the bobbin 1, is inserted into the cylindrical case 8. As a result, the pair of protrusions 13 are elastically deformed to establish stable engagement of the bobbin 1 with the case 8, and the permanent magnet 4 is held between the pair of protrusions 13. Next, by injecting a fluid synthetic resin into the case 8 and solidifying it, the case 8 and the sensor body are integrated with the sealing resin 9. Incidentally, since the upper flange-shaped portion 11 is not perfectly circular, a gap is created between it and the case 8, and the resin enters into the main body side of the coil 2 through this gap. Further, the case 8 has a bottom surface 22,
The end face of the core 3 is exposed here.

[Modified example]

[0017] The present invention is not limited to the above-mentioned embodiment, but can be modified, for example, as follows.

As shown in FIG. 8, a plurality of strips or hemispherical protrusions 23 are provided on the inner circumferential surface of the case 8, so that the pair of protrusions 13 of the bobbin 1 can be pressed by the protrusions 23. . In this case, the diameter of the inscribed circle of the protrusion 23 is made somewhat smaller than the diameter of the circle inscribed by the pair of protrusions 13 before the bobbin 1 is inserted into the case 8. As a result, the protrusion 13 is elastically deformed and comes into close contact with the protrusion 23 .

The convex portion 15 of the bobbin 1 can be formed into a hemispherical shape. Further, the convex portion 15 can be formed to be plastically deformed.

The end of the coil 2 can also be tied to the terminal 7 after the terminal 7 has been inserted into the groove 14 to its final position. Further, in FIG. 5, the permanent magnet 4 can be placed below the core 3.

[0021]

As is clear from the above, according to the present invention, it is possible to easily provide an appropriate margin to the coil terminal, and to prevent the coil terminal from being cut.

[Brief explanation of drawings]

FIG. 1 is a front view showing an assembly of a bobbin, a coil, and a terminal according to an embodiment.

FIG. 2 is a plan view of the assembly of FIG. 1;

FIG. 3 is a left side view of the assembly of FIG. 1;

FIG. 4 is a sectional view taken along line A-A of the assembly of FIG. 1;

FIG. 5 is a central vertical sectional view showing a rotation sensor device in which the assembly of FIG. 1 is housed in a case.

6 is a sectional view taken along line BB of the rotation sensor device of FIG. 5. FIG.

FIG. 7 is a sectional view showing a convex portion of a protruding portion of the bobbin.

FIG. 8 is a sectional view similar to FIG. 6 of a modification of the rotation sensor device.

[Explanation of symbols]

1 Bobbin 2 Coil 3 Core 4 Permanent magnet 7 Terminal 8 Case 10 Cylindrical part 11 Upper flange-shaped part 13.Protruding part 14 Groove 15 Convex part 17 Magnet introduction surface 18 Positioning surface 19　Terminal cover part 20　　　〃 21 Solder

Claims (2)

[Claims] 1. A method for assembling a device comprising a bobbin, a coil wound on the bobbin, and a lead terminal mounted on the bobbin and connected to an end of the coil, wherein a first After the end of the coil is tangled in a part, the end of the coil is also tangled in a second part separated from the first part, and then at least a part of the end is tangled in the second part. A method for assembling a device having a coil, characterized in that the coil is soldered to the lead terminal. 2. A method for assembling a device comprising a bobbin, a coil wound around the bobbin, and a lead terminal attached to the bobbin and connected to an end of the coil, wherein the coil is attached to the bobbin. Before or after winding, a step of inserting the lead terminal halfway into a groove provided in the bobbin, a step of connecting an end of the coil to the lead terminal, and a step of further inserting the lead terminal into the groove of the bobbin. A method for assembling a device having a coil, the method comprising the step of inserting a coil.