JP4272651B2 - Rotation angle detection device and electronic component holding method - Google Patents

Description

  The present invention relates to a rotation angle detection device and an electronic component holding method.

  Conventionally, as an electronic component holding structure, for example, one described in Patent Document 1 is known. That is, in the holding structure described in the publication, a Hall IC (Hall element) as an electronic component is positioned by a resin spacer. The positioned Hall IC is disposed at the center of the magnetic flux detection gap formed in the stator core, and its terminal is connected to a connector pin (terminal) by welding or the like.

In this state, the connector housing is formed by integrally molding the Hall IC, the spacer, the stator core, the connector pin, and the like with resin. The Hall IC is held at a predetermined position of the connector housing.
JP 2001-188003 A

  By the way, in such a holding structure, the position between the Hall IC and the spacer is determined, but positioning between the spacer (and the Hall IC) and the connector pin is difficult. This is because the spacer and the connector pin are assembled separately from each other, so that in addition to the dimensional variation of each individual unit, the variation at the time of assembly is further added. Further, for example, the detection accuracy of the magnetic flux fluctuation due to the Hall IC is also reduced by the displacement of the Hall IC in the connector housing.

  An object of the present invention is to provide a rotation angle detection device and an electronic component holding method capable of improving the positioning accuracy of the electronic component.

  In order to solve the above problems, the invention described in claim 1 includes a permanent magnet that rotates as the object to be detected rotates, and a magnetic detection element that detects a change in magnetic flux of the permanent magnet. In the rotation angle detection device for detecting the rotation angle of the detected object based on the change of magnetic flux changed by the rotation of the permanent magnet, insert molding is performed with reference to a terminal electrically connected to the magnetic detection element, A first resin mold in which a positioning shape for positioning the magnetic detection element and a cup shape for inserting an electronic component electrically connected to the magnetic detection element are formed on the same side surface; the magnetic detection element; A second resin mold that is insert-molded with the terminal as a reference and surrounds the electronic component, and is fitted into the first resin mold. To.

The gist of the invention described in claim 2 is that the positioning shape is a fitting shape fitting with the magnetic detection element.
The gist of the invention described in claim 3 is that the positioning shape is a substantially cup shape into which the magnetic detection element is inserted.

  According to a fourth aspect of the present invention, there is provided a first resin mold in which a positioning shape for positioning the first electronic component and a cup shape for fitting the second electronic component are formed on the same side surface. A step of insert molding with reference, a step of inserting and positioning the first electronic component in the positioning shape and electrically connecting a terminal of the first electronic component and the terminal; and the cup shape Inserting and positioning the second electronic component therein and electrically connecting the terminal of the second electronic component and the terminal; and the first electronic component and the second electronic component. The gist of the present invention is that it comprises a step of insert-molding a second resin mold that is inserted into the first resin mold while being surrounded, with reference to the terminal.

(Function)
According to the invention described in any one of claims 1 to 3, the first resin mold is insert-molded with reference to the terminal, and the positioning shape of the magnetic detection element and the electronic component that are electrically connected to the terminal It has a cup shape. The second resin mold is also insert-molded with respect to the terminal, and integrally surrounds the first resin mold and the magnetic detection element and the electronic component which are positioned on the first resin mold and electrically connected to the terminal. ing. Therefore, the magnetic detection element and the electronic component are positioned and arranged at predetermined positions with respect to the terminal via the first resin mold (positioning shape) and the second resin mold. In general, since the terminal is made of a material (for example, a metal material) that is less likely to be deformed than a resin material and has a high dimensional accuracy, a mold is always arranged on the basis of this, and each resin mold (first and second resin molds) is used. ) Is insert-molded, and the magnetic detection element and the electronic component are positioned, so that the influence of the dimensional variation of the resin material is suppressed. Therefore, the positioning accuracy of the magnetic detection element and the electronic component is improved.

  In addition, the siege here does not necessarily mean completely enveloping, but also includes enveloping a part.

  According to the present invention, the positioning accuracy of the magnetic detection element and the electronic component can be improved, and the positioning accuracy with respect to the permanent magnet that fluctuates the generated magnetic flux according to the rotation angle is improved, thereby detecting the rotation angle. Accuracy can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a rotation angle detection device according to the present invention. FIG. 1 (a) is a plan view, and FIG. 1 (b) is a sectional view taken along line BB in FIG. 1 (a). Each is shown. As shown in the figure, a rotating shaft 12 fixed to a detected body (not shown) is supported by a housing 11 constituting a housing on the main body side of the rotation angle detecting device via a bearing 13. Yes. A substantially bottomed cylindrical yoke 14 made of a magnetic material such as iron is coaxially fixed to the tip end portion (the upper end portion in FIG. 1B) of the rotating shaft 12 by caulking or the like. A substantially cylindrical resin body 15 is coaxially fixed to the inner peripheral side of the yoke 14, and a plurality of permanent magnets 16 are embedded in the resin body 15. The rotating shaft 12, the yoke 14, the resin body 15, and the permanent magnet 16 constitute a rotor, and the generated magnetic flux is changed by rotating together in accordance with a change in the angle of the detected body.

  A connector housing 21 as a second resin mold is mounted on the housing 11 at the upper end side. This connector housing 21 is insert-molded with reference to a terminal 23 electrically connected to a Hall IC 22 as a magnetic detection element, which is an electronic component embedded and held therein. In the state where the connector housing 21 is mounted on the housing 11, the Hall IC 22 is arranged coaxially with the rotary shaft 12 (rotor) in a manner described later. At this time, the permanent magnet 16 fixed by the resin body 15 is disposed around the Hall IC 22. Therefore, when the rotating shaft 12 (permanent magnet 16) rotates according to the change in the angle of the detected object, the magnetic flux generated near the Hall IC 22 varies. The Hall IC 22 is used to detect the rotation angle of the detection target by outputting a voltage corresponding to the magnetic flux.

  Next, details of the holding structure of the Hall IC 22 by the connector housing 21 will be described with reference to FIG. 2 shows a mold 24 as a first resin mold insert-molded with the terminal 23 as a reference. FIG. 2 (a) is a plan view, and FIG. 2 (b) is a plan view of FIG. 2 (a). Sectional drawing along the BB line is shown, respectively. As shown in the figure, the mold 24 is formed by exposing the tip 23a and the like of the terminal 23, and a cup shape 24a as a positioning shape and a fitting shape is formed at a predetermined position. Needless to say, the cup shape 24 a is arranged with reference to the terminal 23. The cup shape 24a has an inner wall surface having the same width and depth as the Hall IC 22. The Hall IC 22 is inserted into the cup shape 24a and positioned with respect to the mold 24. . Thereby, the Hall IC 22 is positioned with respect to the terminal 23 via the mold 24. Further, in a state where the Hall IC 22 is positioned with respect to the mold 24, each bent terminal is electrically connected to the terminal 23. Each terminal of the Hall IC 22 and the terminal 23 are joined by, for example, projection welding.

  The mold 24 is also formed with a cup shape 24b for mounting the electronic component 25. The bent terminal is electrically connected to the terminal 23 in a state where the electronic component 25 is mounted in the cup shape 24b. The terminal of the electronic component 25 and the terminal 23 are also joined by, for example, projection welding.

  In a state where the Hall IC 22 and the electronic component 25 are assembled to the mold 24 in the above manner, the connector housing 21 is insert-molded so as to integrally surround the mold 24 and the Hall IC 22 with the terminal 23 as a reference. The connector housing 21 is formed with a connector mounting portion 21a that allows the distal end portion 23a of the terminal 23 to appear and surround it.

  The Hall IC 22 positioned and held via the connector housing 21 and the mold 24 with respect to the terminal 23 is arranged coaxially with the rotary shaft 12 (rotor) when the connector housing 21 is mounted on the housing 11. Is done.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In this embodiment, the mold 24 is insert-molded with the terminal 23 as a reference, and has a positioning shape (cup shape 24a) of the Hall IC 22 that is electrically connected to the terminal 23. The connector housing 21 is also insert-molded with the terminal 23 as a reference, and integrally surrounds the mold 24 and the Hall IC 22. Therefore, the Hall IC 22 is positioned and arranged at a predetermined position with respect to the terminal 23 via the mold 24 (cup shape 24a) and the connector housing 21. In general, the terminal 23 is made of a material (for example, a metal material) that is less likely to be deformed than a resin material and has a high dimensional accuracy. Therefore, the mold 24 and the connector housing 21 are insert-molded by always placing a mold on the basis of this. By positioning the Hall IC 22, it is possible to suppress the influence due to the dimensional variation of the resin material. Therefore, the positioning accuracy of the Hall IC 22 can be improved.

  (2) In this embodiment, the positioning accuracy of the Hall IC 22 is improved, and the positioning accuracy with respect to the rotor that varies the generated magnetic flux according to the rotation angle is improved, so that variations in the output voltage are also suppressed, and Detection accuracy can be improved.

(3) In the present embodiment, the cup shape 24b for mounting the electronic component 25 on the mold 24 is formed. Therefore, the assembling property of the electronic component 25 can be improved.
(4) In this embodiment, the positioning accuracy of the Hall IC 22 can be improved by a very simple method.

In addition, embodiment of this invention is not limited to the said embodiment, You may change as follows.
In the above-described embodiment, the cup shape 24a is formed in the mold 24, and the Hall IC 22 is inserted and positioned therein. On the other hand, for example, a member having a cup shape may be fixed around the Hall IC 22 and a protrusion to be inserted into the member may be formed on the mold 24.

  In the above-described embodiment, the cup shape 24a is formed in the mold 24, and the Hall IC 22 is inserted and positioned therein. On the other hand, for example, a locking claw for locking the Hall IC 22 may be formed on the mold 24 and positioned.

In the embodiment, the Hall IC 22 is used as the magnetic detection element. However, for example, a magnetoresistive element may be used.
In the embodiment described above, the present invention is embodied in the holding structure of the Hall IC 22 as an electronic component, but may be embodied in the holding structure of other electronic components.

  In the above-described embodiment, one embodiment of the present invention is applied to the rotation angle detection device, but may be applied to other devices.

(A) (b) The top view and sectional drawing which show the rotation angle detection apparatus with which one Embodiment of this invention is applied. (A) (b) The top view and sectional drawing which show a mold.

Explanation of symbols

12 Rotating shaft 21 constituting rotor 21 Connector housing 22 as second resin mold 22 Hall IC as magnetic detection element which is electronic component
23 Terminal 24 Mold 24a as first resin mold Cup shape as positioning shape and fitting shape

Claims (4)

A permanent magnet that rotates in accordance with the rotation of the detected object; and a magnetic detection element that detects a change in the magnetic flux of the permanent magnet. In the rotation angle detection device for detecting the rotation angle,
Insert molding is performed with reference to a terminal electrically connected to the magnetic detection element, and a positioning shape for positioning the magnetic detection element and an electronic component electrically connected to the magnetic detection element are inserted. A first resin mold having a cup shape formed on the same side surface;
A rotation angle characterized by comprising a second resin mold that is insert-molded with respect to the terminal while surrounding the magnetic detection element and the electronic component, and is fitted in the first resin mold. Detection device. The rotation angle detection device according to claim 1, wherein the positioning shape is a fitting shape that fits with the magnetic detection element. The rotation angle detection device according to claim 2, wherein the positioning shape is a substantially cup shape into which the magnetic detection element is inserted. A step of insert-molding a first resin mold in which a positioning shape for positioning the first electronic component and a cup shape for inserting the second electronic component are formed on the same side surface with reference to the terminal;
Inserting and positioning the first electronic component in the positioning shape and electrically connecting the terminal of the first electronic component and the terminal; and
Inserting and positioning the second electronic component in the cup shape and electrically connecting the terminal of the second electronic component and the terminal; and
And a step of insert-molding a second resin mold to be inserted into the first resin mold while surrounding the first electronic component and the second electronic component with reference to the terminal. Electronic component holding method.

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