JP2016061770A - Rotation angle detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation angle detecting device capable of simplifying a manufacturing process by abolishing a filling member and excellent in productivity.SOLUTION: A rotation angle detecting device 1 comprises a rotary member 2 connected to a detected object, a magnet 3 fixed to the rotary member 2, and a housing 5 for housing a magnet detection element which detects rotation of the magnet 3, and detects the rotation of the magnet 3 by the magnet detection element and measures a rotation angle of the detected object. The rotation angle detecting device further comprises: a magnetic detection package 4 incorporating the magnetic detection element; a first resin body 7 incorporating a plurality of lead pins 6 electrically connected to the magnetic detection package 4; a resin cover body 9 mounted on the first resin body 7 and covering the magnetic detection package 4; and a second resin body 8 for partly exposing the resin cover body 9 and formed so as to cover the first resin body 7 and the resin cover body 9. The first resin body 7, the resin cover body 9, and the second resin body 8 form the housing 5.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotation angle detection device.

  A conventional rotation angle detecting device includes a rotating member, a magnet fixed to the rotating member and rotating, a magnetic detection package including a magnetic detecting element for detecting the strength of the magnetic field of the magnet, and the rotating member being rotatable. A housing having a first storage portion for storing the magnetic detection package and a second storage portion for storing the magnetic detection package; and the second storage portion is filled so as to store and hold the magnetic detection package in an airtight manner. And a filling member (see, for example, Patent Document 1).

JP 2011-75413 A

  However, the conventional rotation angle detection device takes man-hours such as blending, stirring, filling, and curing after filling of the filling member.

  Therefore, an object of the present invention is to provide a rotation angle detection device that solves the above problems and simplifies the manufacturing process by eliminating the filling member and is excellent in productivity.

  A rotation angle detection device of the present invention includes a rotating member connected to a detection object, a magnet fixed to the rotating member, and a housing incorporating a magnetic detection element that detects rotation of the magnet. In a rotation angle detection device that detects by a detection element and measures the rotation angle of the detected object, a magnetic detection package incorporating the magnetic detection element and a plurality of lead pins electrically connected to the magnetic detection package are incorporated A first resin body, a resin cover body that is attached to the first resin body and covers the magnetic detection package, the resin cover body is partially exposed, and the first resin body and the resin cover body A second resin body formed so as to cover the housing, and the housing is formed of the first resin body, the resin cover body, and the second resin body.

  With the above configuration, the present invention can achieve the intended purpose, and can eliminate the filling member, simplify the manufacturing process, and provide a rotation angle detection device with excellent productivity.

The top view of the rotation angle detection apparatus of 1st Embodiment of this invention. Sectional drawing of the II-II line in FIG. The top view of the 1st resin body of the embodiment. Sectional drawing of the IV-IV line in FIG. The top view of the cover member of the embodiment. Sectional drawing of the VI-VI line in FIG. The bottom view of the cover member of the embodiment.

  Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.

  A rotation angle detection device 1 according to the present embodiment measures a rotation angle of a detection target, and includes a rotation member 2, a magnet 3, a magnetic detection package 4 incorporating a magnetic detection element, and a magnetic detection package 4. The housing 5 is mainly composed of a housing. The housing 5 includes a first resin body 7, a second resin body 8, and a resin cover body 9. Note that L is a rotation axis of the rotating member 2 and the magnet 3.

  The rotating member 2 rotates together with the connected object to be detected, and is made of a thermoplastic resin material such as polybutylene terephthalate.

  The rotating member 2 has a substantially cylindrical shape, and a concave portion 2a connected to the detected body is provided at one end. In addition, the spring 2b provided in the recessed part 2a contacts the said to-be-detected body, and obtains the reliable connection with the said to-be-detected body. Moreover, the magnet 3 is provided in the other side of the recessed part 2a.

  The magnet 3 is formed in a substantially cylindrical shape. The magnet 3 is dipole magnetized. The magnet 3 is fixed to the rotating member 2. In this embodiment, the magnet 3 is provided integrally with the rotating member 2 by insert molding, and the rotating member 2 is rotated around the rotation axis L of the rotating member 2. It becomes the structure which rotates with it.

  The magnetic detection package 4 includes a magnetic detection element (not shown) such as a Hall IC or an MR element that detects rotation of the magnet 3 covered with a synthetic resin. With this magnetic detection element, the rotation angle of the detected object is measured.

  The magnetic detection package 4 is provided on the first resin body 7 constituting the housing 5. In the magnetic detection package 4, a lead 4 a electrically connected to the magnetic detection element built in the magnetic detection package 4 is electrically connected to a lead pin 6 built in the first resin body 7. The magnetic detection element detects the strength of the magnetic field that changes in accordance with the rotation of the magnet 3 that rotates together with the rotating member 2, converts the detected result into a detection signal, and this detection signal is externally transmitted through the lead pin 6. Is output.

  The first resin body 7 is made of a thermoplastic resin material such as polybutylene terephthalate, and a plurality of lead pins 6 are incorporated by insert molding. In addition to the magnetic detection package 4, an electronic component 10 such as a capacitor for protecting the magnetic detection element is electrically connected to the lead pin 6 by soldering or welding.

  The first resin body 7 is provided with a wall portion 7 a surrounding the magnetic detection package 4. A resin cover body 9 is attached to the wall portion 7a.

  The second resin body 8 is made of a thermoplastic resin material such as polybutylene terephthalate, and covers the first resin body 7 and the resin cover body 9 by insert molding, so that the rotating member 2 and the magnet 3 can be rotated. A storage portion 8a for storing is provided. A part of the resin cover body 9 is exposed in the storage portion 8 a and is formed of the second resin body 8 and the resin cover body 9. The storage portion 8a is formed in a substantially cylindrical shape. In addition, 11 is a packing whose cross-sectional shape which consists of elastic members, such as rubber | gum, is Y-shaped, and prevents that a foreign material penetrate | invades in the accommodating part 8a. Reference numeral 12 denotes a resin washer that is held by the second resin body 8 so that the rotating member 2 does not come out of the storage portion 8a. The washer 12 has an annular shape, and the concave portion 2a of the rotating member 2 is exposed.

  The resin cover body 9 is made of a thermoplastic resin material such as polybutylene terephthalate. The magnetic detection package 4 is arranged so as to face the magnet 3 through the resin cover body 9.

  The resin cover body 9 has a flat plate shape, and includes a cylindrical protrusion 9a on the magnet 3 side. A plate-like portion around the protrusion 9a is a flange portion 9b. A part of the flange portion 9b is built in the second resin body 8 by insert molding. The flange portion 9b built in the second resin body 8 is provided with a protrusion 9c that surrounds the protrusion 9a without a break, with the protrusion 9a as a center. The protrusion 9c has a triangular cross-sectional shape, and the apex portion of the triangle is melted by the temperature of the resin at the time of molding the second resin body 8, and the flange portion 9b and the second resin body 8 are integrated. It is firmly fixed. Further, a flat surface 9d serving as a sliding surface on which the rotating member 2 slides is provided on one side of the flange 9b between the protrusion 9a and the protrusion 9c on the magnet 3 side.

  Further, the resin cover body 9 is provided with a protruding wall 9e that protrudes toward the magnetic detection package 4 on the magnetic detection package 4 side. The protruding wall 9e is formed without a break. The protruding wall 9e is press-fitted into a wall portion 7a provided in the first resin body 7, and the resin cover body 9 is temporarily fixed by press-fitting.

  Further, the flange portion 9 b of the resin cover body 9 is provided with a rib 9 f in contact with the first resin body 7. The rib 9f can prevent deformation of the resin cover body 9 during insert molding of the second resin body 8, so that the sliding performance of the rotating member 2 can be maintained. In this embodiment, the rib 9f is provided on the resin cover body 9, but the rib may be provided on the first resin body 7 so as to be in contact with the resin cover body 9.

  As described above, the resin cover body 9 is attached to the first resin body 7 so as to cover the magnetic detection package 4 provided on the first resin body 7, and is attached to the second resin body 8 together with the first resin body 7. The magnetic detection package 4 is protected from the molding pressure of the second resin body 8 by the insert molding.

  As described above, the rotating member 2 connected to the detection object, the magnet 3 fixed to the rotating member 2, and the housing 5 housing the magnetic detection element for detecting the rotation of the magnet 3, the magnetic In a rotation angle detection apparatus 1 that detects a detection angle and measures the rotation angle of the detected object, a magnetic detection package 4 incorporating the magnetic detection element, and a plurality of lead pins electrically connected to the magnetic detection package 4 6, a resin cover body 9 that is attached to the first resin body 7 and covers the magnetic detection package 4, the resin cover body 9 is partially exposed, and the first resin body 7 A second resin body 8 formed so as to cover the resin cover body 9, and the housing 5 is formed by the first resin body 7, the resin cover body 9, and the second resin body 8. abolish To simplify the manufacturing process and can be obtained a rotation angle detecting device 1 with excellent productivity.

  In addition, since the storage portion 8a for rotatably storing the rotating member 2 and the magnet 3 is formed of the second resin body 8 and the resin cover body 9, the resin cover body 9 on which the rotating member 2 slides can be used as the second resin. By forming the body 8 from different parts, it is possible to suppress the influence of sink marks and the like at the time of molding, and to suppress the influence on the rotation of the rotating member 2.

  Further, since the magnetic detection package 4 is disposed so as to face the magnet 3 through the resin cover body 9, the resin forming the second resin body 8 is directly magnetized when the second resin body 8 is molded. It does not hit the detection package 4, and the influence at the time of molding can be suppressed.

  Further, the resin cover body 9 includes a flange portion 9b built in the second resin body 8, and the flat surface 9d provided on one side of the flange portion 9b is used as a sliding surface of the rotating member 2. Since the slidability of the rotating member 2 can be improved, the operation durability can be improved.

  Further, since the resin cover body 9 is press-fitted into the first resin body 7, positioning of the resin cover body 9 with the mold can be made unnecessary during the insert molding of the second resin body 8. , Productivity can be improved.

  Further, at least one of the first resin body 7 or the resin cover body 9 is provided with a rib 9f in contact with the other, so that deformation of the resin cover body 9 can be prevented during insert molding of the second resin body 8. Therefore, the sliding performance of the rotating member 2 can be prevented from being impaired.

  INDUSTRIAL APPLICABILITY The present invention can be used for a rotation angle detection device in which a magnetic detection package including a magnetic detection element is embedded by insert molding.

DESCRIPTION OF SYMBOLS 1 Rotation angle detection apparatus 2 Rotating member 2a Recessed part 2b Spring 3 Magnet 4 Magnetic detection package 4a Lead 5 Housing 6 Lead pin 7 1st resin body 7a Wall part 8 2nd resin body 8a Storage part 9 Resin cover body 9a Protrusion part 9b Flange part 9c Protrusion 9d Flat surface 9e Protruding wall 9f Rib 10 Electronic component 11 Packing 12 Washer L Rotating shaft

Claims (6)

A rotating member connected to the detection object; a magnet fixed to the rotating member; and a housing containing a magnetic detection element that detects rotation of the magnet; and the detection by the magnetic detection element In a rotation angle detection device for measuring a rotation angle of a body, a magnetic detection package including the magnetic detection element, a first resin body including a plurality of lead pins electrically connected to the magnetic detection package, A resin cover body that is attached to the first resin body and covers the magnetic detection package, and a second cover that partially exposes the resin cover body and covers the first resin body and the resin cover body. A rotation angle detection device comprising: a resin body, wherein the housing is formed of the first resin body, the resin cover body, and the second resin body. The rotation angle detection device according to claim 1, wherein a storage portion that rotatably stores the rotating member and the magnet is formed by the second resin body and the resin cover body. The rotation angle detection device according to claim 1, wherein the magnetic detection package is disposed so as to face the magnet through the resin cover body. The said resin cover body is provided with the flange part incorporated in the said 2nd resin body, The flat surface provided in the single side | surface side of this flange part was made into the sliding surface of the said rotation member, It is characterized by the above-mentioned. The rotation angle detection device according to 1. The rotation angle detection device according to claim 1, wherein the resin cover body is press-fitted into the first resin body. The rotation angle detection device according to claim 1, wherein a rib in contact with the other is provided on at least one of the first resin body or the resin cover body.

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