JP6357738B2 - Method for assembling rotation angle detector - Google Patents

Description

The present invention relates to the assembly how the you detect the rotation angle of the rotary shaft rotation angle detection device.

  Conventionally, as shown in Patent Document 1, a vehicle rotation angle detection device that detects a rotation angle of a rotation shaft is known. This rotation angle detection device includes a shaft that is a motor shaft, a cover that is attached to the shaft, a magnet that is attached to the cover, and a sensor that is provided facing the magnet and detects magnetism.

  The cover includes a shaft hole into which the tip of the shaft is press-fitted, a magnet hole that is continuous with the shaft hole and to which a magnet is attached via an adhesive, and a through hole that extends from the magnet hole toward the opposite side of the shaft hole. It is equipped with. The shaft hole, the magnet hole, and the through hole are provided coaxially. Therefore, when the shaft is press-fitted into the shaft hole, the shaft and the magnet are positioned coaxially. Thereby, the displacement of the relative position of the magnet with respect to the shaft when the shaft rotates is regulated.

  The sensor is attached to the wall surface on the shaft side of the ECU attached to the vehicle body. The sensor faces the magnet through the through hole. The motor is attached to the vehicle body in the same manner as the ECU.

JP 2010-93869 A

  In the rotation angle detection device of Patent Document 1, the relative position between the rotation shaft and the magnet is defined, but it is not considered to define the relative position between the magnet and the sensor. For this reason, it cannot be said that the reliability of the accuracy of the detected rotation angle is sufficient.

The present invention has been made in view of these circumstances, an object thereof is to provide an assembly how the accuracy of high not rotating angle detection apparatus of the rotational angle detecting.

  In order to solve the above problems, a case that accommodates a rotating shaft, a lid that is coaxially attached to the case and covers an opening of the case, and is provided on the lid and faces an end of the rotating shaft An opposing part, a magnet attached to one end of the rotating shaft and the opposing part, a magnetic sensor attached to the other end of the rotating shaft and the opposing part and detecting a magnetic field formed by the magnet, In the method of assembling the rotation angle detecting device, the magnet or the magnet attached to the facing portion with the lid attached to the case and the rotating shaft or a portion coaxial with the rotating shaft as a reference Using a mounting jig that can define the position of the sensor, the facing portion is positioned with respect to the lid portion, and in the positioned state, the facing portion is attached to the lid portion, and the lid portion is moved forward. And gist be attached to the case.

  According to this method of assembling the rotation angle detection device, when positioning the facing portion on which the magnet or the magnetic sensor is mounted, the unsteady reference called the rotation axis is used, and the position of the magnet or the magnetic sensor is directly set with respect to this reference. Since the mounting jig is specified, the relative position of both parts can be defined with high accuracy.

The gist of the above assembly method is that the mounting jig is used with the magnet or the magnetic sensor attached to the end of the rotating shaft as a part coaxial with the rotating shaft.
According to this method of assembling the rotation angle detection device, the other of the magnet and the magnetic sensor attached to the rotating shaft is directly used as a reference for defining one position of the magnet and the magnetic sensor attached to the facing portion. Compared with the case where the position of one of the magnet and the magnetic sensor attached to the facing portion is defined using another reference, the relative position of both parts can be defined with high accuracy.

  In the assembling method, the case includes an annular protrusion that is provided coaxially with the rotation shaft and protrudes toward the lid, and the mounting jig is defined as a portion that is coaxial with the rotation shaft. The gist is to use.

  According to this method of assembling the rotation angle detection device, the relative position between one of the magnet and the magnetic sensor attached to the rotating shaft and the other of the magnet and the magnetic sensor attached to the opposing portion is determined by a simple configuration called an annular protrusion. Can be prescribed.

  In the assembling method, after the positioned facing portion is attached to the lid portion, the lid portion is removed from the case, the attachment jig is removed, and the lid portion is reattached to the case. And

According to this method of assembling the rotation angle detection device, the mounting jig does not remain in the device, so there is no possibility of hindering smooth rotation of the rotation shaft .

According to the assembly how the rotation angle detecting apparatus of the present invention, there is an effect that the accuracy of the rotation angle to be detected is increased.

Sectional drawing of the rotary electric machine in 1st Embodiment. Sectional drawing of the rotary electric machine which shows the attachment aspect of the rotation angle detection apparatus in 1st Embodiment. Sectional drawing of the rotary electric machine which shows the attachment aspect of the rotation angle detection apparatus in 1st Embodiment. Sectional drawing of the rotary electric machine in 2nd Embodiment. Sectional drawing of the rotary electric machine which shows the attachment aspect of the rotation angle detection apparatus in 2nd Embodiment. Sectional drawing of the rotary electric machine which shows the attachment aspect of the rotation angle detection apparatus in 2nd Embodiment. Sectional drawing of the rotary electric machine which shows the attachment aspect of the rotation angle detection apparatus in another example.

[First Embodiment]
Hereinafter, a first embodiment of a rotating electrical machine including a rotation angle detection device will be described.
<Overall configuration>
As shown in FIG. 1, the rotating electrical machine 11 includes a bottomed cylindrical case 12 and an inner lid 13 that closes the opening of the case 12. A cylindrical stator 14 is fixed to the inner peripheral surface of the case 12. The stator 14 includes a cylindrical core 15, two insulators 16 and 17 provided at both ends of the core 15, and a plurality of coils 18 wound around the core 15 via the insulators 16 and 17. ing.

  A cylindrical rotor 19 is inserted into the stator 14. The rotor 19 includes a stepped columnar rotating shaft 20 and a cylindrical rotor magnet 21 fixed to the outer peripheral surface of the rotating shaft 20. The rotating shaft 20 is rotatably supported via a bearing 22 provided on the inner bottom portion of the case 12 and a bearing 23 provided on the inner surface of the inner lid 13. Note that the tip end portion 26 on the inner lid 13 side of the rotating shaft 20 protrudes from the inner lid 13. The protruding height from the inner lid 13 of the rotary shaft 20 is set to a height H1. In this example, the inner lid 13 also corresponds to a case that houses the rotating shaft 20 together with the case 12.

  A disc-shaped holder 24, which is a resin molded product, is provided at an end portion of the stator 14 on the inner lid 13 side. The holder 24 holds a plurality of bus bars 25. Both ends of each coil 18 are appropriately connected to each bus bar 25. Three-phase AC power is supplied to each coil 18 via each bus bar 25.

  Further, the rotating electrical machine 11 includes a rotation angle detection device 30 attached to the inner lid 13 and the distal end portion 26. Here, a first annular protrusion 27 is provided on the surface of the inner lid 13 opposite to the stator 14. The inner diameter of the first annular protrusion 27 is set to a diameter φ1, the outer diameter is set to a diameter φ2, and the protruding height is set to a height H2. The center of the first annular protrusion 27 is coaxial with the rotary shaft 20.

<Configuration of rotation angle detection device>
The rotation angle detection device 30 includes a magnetic field unit 31 attached to the distal end portion 26 and a detection unit 39 attached to the inner lid 13.

<Configuration of magnetic field unit>
The magnetic field unit 31 includes a magnet holder 33 and a magnet 34. The magnet 34 corresponds to a magnet.

The magnet 34 has a disk shape in which the outer diameter is set to a diameter φ3 equal to the outer diameter φ3 of the tip portion 26 and the thickness is set to a height H3 shorter than the protruding height of the first annular protrusion 27. .
The magnet holder 33 includes a cylindrical portion 35 and a cylindrical portion whose inner diameter is set to a diameter φ3 which is the outer diameter of the tip end portion 26 and whose outer diameter is set to a diameter φ4 which is smaller than the inner diameter φ1 of the first annular protrusion 27. And a partition wall 36 that divides the interior of the shaft 35 into a shaft mounting portion 37 and a magnet mounting portion 38. The height of the shaft attachment portion 37 is set to be shorter than the height H <b> 1, which is the height protruding from the inner lid 13 of the tip end portion 26. The height of the magnet mounting portion 38 is set to a height H3 that is equal to the thickness of the magnet 34. The height from the inner lid 13 of the magnet attachment portion 38 is a height H4.

  The tip end portion 26 of the rotating shaft 20 is press-fitted into the shaft mounting portion 37 of the magnet holder 33. Due to the press-fitting, the rotary shaft 20 and the shaft mounting portion 37 are positioned on the same axis. Further, the magnet 34 is press-fitted into the magnet mounting portion 38 of the magnet holder 33. Due to the press-fitting, the magnet 34 and the magnet mounting portion 38 are positioned on the same axis. Since the shaft mounting portion 37 and the magnet mounting portion 38 are formed on the same axis, the rotary shaft 20 and the magnet 34 are positioned on the same axis by the press-fitting.

<Configuration of detection unit>
The detection unit 39 includes a pedestal 80, a substrate 43, a magnetic sensor 44, and an outer lid 45.
The pedestal 80 includes a cylindrical pedestal main body portion 81, a first flange portion 82 that is continuous with the end portion on the inner lid 13 side, and a second flange portion 83 that is continuous with the end portion on the side opposite to the inner lid 13. And. The pedestal 80 includes a cylindrical support portion 84 that protrudes from the inner peripheral surface of the pedestal main body 81 between the first and second flange portions 82 and 83.

  The inner diameter of the pedestal main body 81 is set equal to the inner diameter φ1 of the first annular protrusion 27. In addition, the outer diameter of the pedestal main body 81 is set to a diameter φ7 that is larger than the outer diameter φ2 of the first annular protrusion 27 and smaller than the outer diameter φ6 of the inner lid 13. A notch 85 is recessed in the inner peripheral surface of the end portion of the pedestal main body 81 on the inner lid 13 side. The inner diameter of the notch 85 is set equal to the outer diameter φ 2 of the first annular protrusion 27. The depth of the notch 85 is set equal to the height H <b> 2 that is the protruding height of the first annular protrusion 27. Accordingly, the first annular protrusion 27 can be fitted into the notch 85.

The outer diameters of the first and second flange portions 82 and 83 are set equal to the outer diameter φ6 of the inner lid 13.
The pedestal 80 is attached to the case 12 with a fastener so as to sandwich the inner lid 13 between the pedestal 80 and the case 12.

  The inner diameter of the support portion 84 is set to a diameter φ5 that is larger than the outer diameter φ4 of the magnet mounting portion 38 and smaller than the inner diameter φ1 of the first annular protrusion 27. Further, the distance between the surface opposite to the inner lid 13 of the support portion 64 and the inner lid 13 is set to a height H5 higher than the height H4 from the inner lid 13 of the magnet attachment portion 38. .

  A rectangular substrate 43 is attached to the support portion 84 via a fastener. A square plate-shaped magnetic sensor 44 is attached in advance to the center of the surface of the substrate 43 on the side of the inner lid 13 by soldering. The substrate 43 is attached to the support portion 84 so that the center of the magnetic sensor 44 is coaxial with the rotary shaft 20. The center of the magnetic sensor 44 is an intersection of diagonal lines on the surface facing the rotation axis 20. The length of one side of the magnetic sensor 44 is set to L8. The thickness of the magnetic sensor 44 is obtained by subtracting the height H4 from the inner lid 13 of the magnet attachment portion 38 from the height H5 which is the distance between the surface opposite to the inner lid 13 of the support portion 84 and the inner lid 13. It is said that the height is even lighter than that of the H6. Details concerning the attachment of the substrate 43 will be described later. The substrate 43 corresponds to the facing portion.

  The outer lid 45 has a disk shape. The outer diameter of the outer lid 45 is set equal to the outer diameter φ6 of the second flange portion 83. The outer lid 45 is attached to the base 80 via a fastener so as to close the opening on the second flange portion 83 side. Note that the base 80 and the outer lid 45 attached to the base 80 correspond to a lid portion.

<Attachment of rotation angle detector>
Next, attachment of the rotation angle detection device 30 will be described. For the attachment, an attachment jig 90 is used as shown in FIG. First, the configuration of the mounting jig 90 will be described.

  As shown in FIG. 2, the mounting jig 90 has a cylindrical shape whose inner diameter is a diameter φ3 that is the outer diameter of the tip end portion 26 and whose outer diameter is a diameter φ4 that is smaller than the inner diameter φ5 of the support portion 84. The shaft-side alignment unit 91 and a cylindrical sensor-side alignment unit 92 having a square inner circumference whose one side is equal to the length L8 of one side of the magnetic sensor 44 and having an outer diameter of φ4. It consists of and. The shaft side alignment unit 91 and the sensor side alignment unit 92 are provided coaxially. Further, the shaft side alignment portion 91 and the sensor side alignment portion 92 are separated by a partition wall 93.

  The height of the shaft side alignment portion 91 is set to be shorter than the height H1 of the tip end portion 26. The height of the sensor side alignment unit 92 is set to be higher than the height H6 that is the thickness of the magnetic sensor 44. Further, the distance between the surface of the partition wall 93 on the shaft side alignment portion 91 side and the end of the sensor side alignment portion 92 is the distance between the surface on the opposite side of the inner lid 13 of the support portion 84 and the inner lid 13. The height H7 is obtained by subtracting the height H1 of the distal end portion 26 from the height H5 that is the distance between them.

Next, how the rotation angle detection device 30 is attached will be described.
First, as shown in FIG. 2, the pedestal 80 is set on the inner lid 13 so that the first annular protrusion 27 contacts the inner peripheral surface of the notch 85 (temporary attachment step). Next, the mounting jig 90 is set so that the tip end portion 26 of the rotating shaft 20 contacts the inner peripheral wall of the shaft side alignment portion 91. Thereby, the rotating shaft 20 and the attachment jig 90 are coaxially positioned, that is, the rotating shaft 20 and the sensor side alignment portion 92 are positioned coaxially.

  Next, the substrate 43 is set on the support portion 64 so that the outer peripheral surface of the magnetic sensor 44 soldered in advance is in contact with the inner peripheral surface of the sensor side alignment portion 92 of the mounting jig 90, and the fastener Fixed by. Since the rotation shaft 20 and the sensor side alignment portion 92 are coaxially positioned, the magnetic sensor 44 that contacts the inner peripheral surface of the sensor side alignment portion 92 is also positioned coaxially with the rotation shaft 20.

Next, the base 80 to which the substrate 43 is attached and the attachment jig 90 are removed.
Thereafter, as shown in FIG. 3, the magnet holder 33 into which the magnet 34 is press-fitted is inserted into the tip end portion 26 of the rotary shaft 20. Thereby, the magnet 34 and the rotating shaft 20 are located on the same axis.

  Next, the pedestal 80 to which the substrate 43 is attached is set so that the first annular protrusion 27 contacts the inner peripheral surface of the notch 85 again. And the said base 80 is fixed with a fastener. Since the pedestal 80 is attached to the same place as the temporary attachment step, the magnetic sensor 44 is positioned coaxially with the rotary shaft 20 even if the pedestal 80 is fixed to the inner lid 13 and the case 12 by the fasteners. To do.

  Next, as shown in FIG. 1, the outer lid 45 is fixed with a fastener so as to close the opening of the base 80 on the second flange portion 83 side. Thus, the attachment of the rotation angle detection device 30 is completed.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) The rotation angle detection device 30 includes a step of temporarily attaching the pedestal 80 to the inner lid 13, and a step of positioning the magnetic sensor 44 attached to the pedestal 80 using the attachment jig 90 with respect to the rotary shaft 20. The pedestal 80 is assembled through a process of removing it from the inner lid 13, a process of removing the mounting jig 90 and attaching the magnet 34 to the rotary shaft 20, and a process of permanently attaching the pedestal 80 to the inner lid 13. According to this assembling method, the position of the magnetic sensor 44 with respect to the rotating shaft 20 and the position of the magnet 34 with respect to the rotating shaft 20 are respectively defined. Therefore, the relative position between the magnetic sensor 44 and the magnet 34 can be defined with high accuracy.

(2) Since the relative position between the magnetic sensor 44 and the magnet 34 is defined with high accuracy, the accuracy of the rotation angle detected by the rotation angle detection device 30 is good.
[Second Embodiment]
Next, a second embodiment of the rotating electrical machine provided with the rotation angle detection device will be described. Note that the second embodiment differs from the first embodiment in the rotation angle detection device, more precisely, the configuration of the detection unit and the assembly mode thereof. For this reason, the detailed description of the same parts as in the first embodiment is omitted.

<Configuration of detection unit>
As shown in FIG. 4, the detection unit 32 includes a first cylindrical pedestal 41, a second cylindrical pedestal 42, a substrate 43, a magnetic sensor 44, and an outer lid 45.

  The first cylindrical pedestal 41 includes a cylindrical first pedestal main body 51, an annular groove 52 that is recessed in the surface on the inner lid 13 side of the first pedestal main body 51, and a first pedestal main body. 51, and a second annular protrusion 53 protruding on the surface opposite to the inner lid 13.

  The inner diameter of the first pedestal main body 51 is set to a diameter φ5 that is larger than the outer diameter φ4 of the magnet mounting portion 38 and smaller than the inner diameter φ1 of the first annular protrusion 27. The outer diameter of the first pedestal main body 51 is set to a diameter φ6 that is equal to the outer diameter φ6 of the inner lid 13. The thickness of the first pedestal main body 51 is set to a height H8 that is higher than the projection height H1 from the inner lid 13 of the distal end portion 26.

  The inner diameter of the annular groove 52 is set equal to the inner diameter φ1 of the first annular protrusion 27. The outer diameter of the annular groove 52 is set equal to the outer diameter φ2 of the first annular protrusion 27. Further, the depth of the annular groove 52 is set to be equal to the protrusion height H <b> 2 of the first annular protrusion 27. From these, the first annular protrusion 27 can be fitted into the annular groove 52.

  The inner diameter of the second annular protrusion 53 is set equal to the inner diameter φ1 of the first annular protrusion 27. The outer diameter of the second annular protrusion 53 is set equal to the outer diameter φ2 of the first annular protrusion 27. Furthermore, the protrusion height of the second annular protrusion 53 is set equal to the protrusion height H2 of the first annular protrusion 27. The first pedestal main body 51, the annular groove 52, and the second annular protrusion 53 are formed coaxially with each other.

The first cylindrical pedestal 41 is attached to the inner lid 13 with the first annular protrusion 27 fitted in the annular groove 52. Details of the attachment will be described later.
The second cylindrical pedestal 42 includes a cylindrical second pedestal main body 61, a first flange 62 continuous to the end of the second pedestal main body 61 on the first cylindrical pedestal 41 side, And a second flange portion 63 continuous to the end portion of the second pedestal main body portion 61 opposite to the first cylindrical pedestal 41. The second cylindrical pedestal 42 includes a cylindrical support portion 64 that protrudes from the inner peripheral surface of the second pedestal main body 61 between the first and second flange portions 62 and 63. .

  The inner diameter of the second pedestal main body 61 is set equal to the inner diameter φ1 of the first and second annular protrusions 27 and 53. In addition, the outer diameter of the second pedestal main body 61 is larger than the outer diameter φ2 of the first and second annular protrusions 27 and 53 and larger than the outer diameter φ6 of the inner lid 13 and the first pedestal main body 51. A small diameter φ7 is set. A notch 65 is recessed in the inner peripheral surface of the end of the second pedestal main body 61 on the first cylindrical pedestal 41 side. The inner diameter of the notch 65 is set equal to the outer diameter φ2 of the first and second annular protrusions 27 and 53 and the annular groove 52. The depth of the notch 65 is set to be equal to the height H2 which is the depth of the first and second annular protrusions 27 and 53 and the depth of the annular groove 52. Accordingly, the first and second annular protrusions 27 and 53 can be fitted into the notch 65.

The outer diameters of the first and second flange portions 62 and 63 are set equal to the outer diameter φ6 of the inner lid 13 and the first pedestal main body 51.
The second cylindrical pedestal 42 is attached to the case 12 via a fastener so that the inner lid 13 and the first cylindrical pedestal 41 are sandwiched between the second cylindrical pedestal 42 and the case 12. Details of the attachment will be described later.

  The inner diameter of the support portion 64 is set equal to the inner diameter φ5 of the first pedestal main body portion 51. The distance between the surface opposite to the inner lid 13 of the support portion 64 and the first flange portion 62 is set equal to the height H8 that is the thickness of the first pedestal main body portion 51.

  A rectangular substrate 43 is attached to the support portion 64 via a fastener. A square plate-shaped magnetic sensor 44 is attached in advance to the center of the surface of the substrate 43 on the side of the inner lid 13 by soldering. The substrate 43 is attached to the support portion 64 so that the magnetic sensor 44 is coaxial with the rotary shaft 20. The center of the magnetic sensor 44 is an intersection of diagonal lines on the surface facing the rotation shaft 20. The length of one side of the magnetic sensor 44 is set to L8. The thickness of the magnetic sensor 44 is obtained by subtracting the height H4 from the inner lid 13 of the magnet attachment portion 38 from the height H5 which is the distance between the surface opposite to the inner lid 13 of the support portion 84 and the inner lid 13. It is said that the height is even lighter than that of the H6. Details of mounting the substrate 43 will be described later. The substrate 43 corresponds to the facing portion.

  The outer lid 45 has a disk shape. The outer diameter of the outer lid 45 is set equal to the outer diameter φ6 of the second flange portion 63. The outer lid 45 is attached to the second cylindrical pedestal 42 via a fastener so as to close the opening of the second cylindrical pedestal 42 on the second flange portion 63 side. The first cylindrical pedestal 41, the second cylindrical pedestal 42, and the outer lid 45 attached to the second cylindrical pedestal 42 correspond to a lid portion.

<Attachment of rotation angle detector>
Next, attachment of the rotation angle detection device 30 will be described. For the attachment, an attachment jig 70 is used as shown in FIG.

  As shown in FIG. 5, the mounting jig 70 includes a cylindrical portion 71, a flange portion 72 continuous with the end portion on the inner lid 13 side of the cylindrical portion 71, and an end portion on the opposite side to the inner lid 13 of the cylindrical portion 71. And a sensor-side alignment unit 73 that is continuous with the sensor.

  The inner diameter of the cylindrical portion 71 is set equal to the outer diameter φ4 of the magnetic sensor 44. The outer diameter of the cylindrical portion 71 is set to a diameter φ9 that is smaller than the inner diameter φ5 of the support portion 64. The axial length of the cylindrical portion 71 is set to be equal to the height H8 that is the distance between the surface on the opposite side of the inner lid 13 of the support portion 64 and the first flange portion 62.

  The outer diameter of the flange portion 72 is set equal to the inner diameter of the first annular protrusion 27. The thickness of the flange portion 72, that is, the length in the axial direction is set equal to the protrusion height H <b> 2 of the first annular protrusion 27.

  The sensor side alignment unit 73 has a cylindrical shape having a square inner circumference in which the length of one side is equal to the length L8 of one side of the magnetic sensor 44. The thickness of the sensor side alignment unit 73 is set equal to the height H6 that is the thickness of the magnetic sensor 44.

Next, how the rotation angle detection device 30 is attached will be described.
First, as shown in FIG. 5, the mounting jig 70 is set so that the outer peripheral surface of the flange portion 72 is along the inner peripheral surface of the first annular protrusion 27. Further, the second cylindrical pedestal 42 is set on the inner lid 13 so that the first annular protrusion 27 comes into contact with the inner peripheral surface of the notch 65 (temporary mounting step). Since the first annular protrusion 27 is coaxial with the rotation shaft 20, the cylindrical portion 71 and the sensor side alignment portion 73 of the mounting jig 70 are also coaxial with the rotation shaft 20. The first annular protrusion 27 corresponds to a portion that is coaxial with the rotation axis.

  Next, the substrate 43 is set on the support portion 64 so that the outer peripheral surface of the magnetic sensor 44 soldered in advance is in contact with the inner peripheral surface of the sensor side alignment portion 73 of the mounting jig 70, and the fastener Fixed by. Since the sensor side alignment unit 73 is positioned coaxially with the rotation shaft 20, the magnetic sensor 44 that contacts the inner peripheral surface of the sensor side alignment unit 73 is also positioned coaxially with the rotation shaft 20.

  Next, as shown in FIG. 6, the second cylindrical base 42 to which the substrate 43 is attached and the attachment jig 70 are removed. Then, the magnet holder 33 into which the magnet 34 is press-fitted is press-fitted into the distal end portion 26 of the rotating shaft 20. In addition, the first cylindrical pedestal 41 is attached so that the annular groove 52 fits in the first annular protrusion 27, and the second cylinder in which the substrate 43 is attached so that the notch 65 contacts the second annular protrusion 53. Each pedestal 42 is set and fixed by a fastener. Since the first and second annular protrusions 27 and 53 have the same inner diameter and outer diameter from the rotary shaft 20, the first cylindrical base 41 is interposed between the second cylindrical base 42 and the inner lid 13. The magnetic sensor 44 is positioned on the same axis as the rotating shaft 20 even when attached in such a state.

  Next, as shown in FIG. 4, the outer lid 45 is fixed with a fastener so as to close the opening on the second flange portion 63 side in the second cylindrical pedestal 42. Thus, the attachment of the rotation angle detection device 30 is completed.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(3) The rotation angle detection device 30 includes a step of temporarily attaching the second pedestal 42 to the inner lid 13 and a mounting jig 70 on the first annular protrusion 27 which is a portion coaxial with the rotation shaft 20. The step of defining the magnetic sensor 44 with respect to the rotating shaft 20 by contact, the step of removing the second pedestal 42 to which the substrate 43 to which the magnetic sensor 44 is attached from the inner lid 13 is removed, and the mounting jig 70 is removed. The assembly is performed through the step of attaching the magnet 34 to the rotating shaft 20 and the step of permanently attaching the second pedestal 42 to the inner lid 13 via the first pedestal 41. According to this assembling method, the position of the magnetic sensor 44 with respect to the rotating shaft 20 and the position of the magnet 34 with respect to the rotating shaft 20 are respectively defined. Therefore, the relative position between the magnetic sensor 44 and the magnet 34 can be defined with high accuracy.

(4) Further, since the mounting jig 70 does not remain in the rotation angle detection device 30, there is no possibility of hindering smooth rotation of the rotating shaft 20.
In addition, you may change the said embodiment as follows.

  In the first and second embodiments, the magnetic sensor 44 is positioned relative to the rotating shaft 20 and the relative position between the magnetic sensor 44 and the magnet 34 whose position is defined with respect to the rotating shaft 20. However, the position may be directly defined with respect to the magnet 34 whose position is defined with respect to the rotating shaft 20.

  For example, as shown in FIG. 7, a case where the position of the magnetic sensor 44 is directly defined with respect to the magnet 101 attached to the tip portion 26 of the rotating shaft 20 will be described. The magnet 101 has a disk shape having an outer diameter φ10 larger than the outer diameter φ3 of the distal end portion 26, and the center axis thereof is coaxial with the rotary shaft 20.

  As shown in FIG. 7, the mounting jig 110 has a square shape in which the inner diameter is the magnet-side alignment portion 112 having the outer diameter φ10 of the magnet 101 and the length of one side is equal to the length L8 of one side of the magnetic sensor 44. And a sensor-side alignment unit 111 having an inner circumference. The magnet side alignment unit 112 and the sensor side alignment unit 111 are provided coaxially. The magnet side alignment unit 112 and the sensor side alignment unit 111 are separated by a partition wall 113.

  If the rotation angle detection device is assembled by employing the mounting jig 110 configured in this way, the magnetic sensor 44 attached to the substrate 43 has a relative position with respect to the magnet 34 attached to the rotary shaft 20. Therefore, the relative positions of both parts can be defined with high accuracy as compared with the case of being indirectly defined as in the first and second embodiments.

  Note that, according to the first and second embodiments and this separate example, the rotating shaft 20, the magnet 34, and the magnetic sensor 44 are all located on the same axis, but between the magnet 34 and the magnetic sensor 44. And a relative position between the rotary shaft 20 and the magnetic sensor 44 or the magnet 34 attached to the substrate 43 corresponding to the opposing portion. Even when configured in this manner, the same effects as those of the above-described embodiments and the above-described other examples can be obtained.

-In the said 2nd Embodiment, the attachment jig | tool 70 does not necessarily need to be removed.
In the second embodiment, the first cylindrical pedestal 41 may have the function of the mounting jig 70. That is, for example, the inner diameter of the first pedestal main body 51 is set to a diameter φ4 that is the outer diameter of the magnetic sensor 44, and the thickness of the inner diameter portion is set to twice the height H5. If comprised in this way, the 1st cylindrical pedestal 41 has the function of the attachment jig 70.

  In the second embodiment, the detection unit 32 includes two pedestals, that is, the first and second cylindrical pedestals 41 and 42. However, one detection unit 32 is provided as in the pedestal 80 of the first embodiment. It may be.

  -You may abbreviate | omit the 1st and 2nd flange parts 82 and 83 in the said 1st Embodiment, and the 1st and 2nd flange parts 62 and 63 in the said 2nd Embodiment. In this case, the outer diameter of the pedestal main body 81 in the first embodiment and the outer diameter of the second pedestal main body 61 in the second embodiment are set to the outer diameter φ6 of the inner lid 13, respectively. If comprised in this way, between the inner lid 13 and the outer lid 45, the base 80 in the first embodiment, and the first and second cylindrical bases 41 and 42 in the second embodiment, respectively. These can be attached to hold them.

  In the first embodiment, the substrate 43 is attached to the support portion of the pedestal 80, and in the second embodiment, the substrate 43 is attached to the support portion 64 of the second cylindrical pedestal 42. It may be attached to the lid 13 side. In this case, the outer lid 45 corresponds to the lid portion.

In the first and second embodiments, the support portions 84 and 64 are formed in a cylindrical shape, but may be formed in a disk shape so as to cover the distal end portion 26 of the rotating shaft 20.
In the first and second embodiments, the inner lid 13 may be omitted. In this case, a protrusion corresponding to the first annular protrusion 27 is provided in the opening of the case 12. Even if comprised in this way, in the said 2nd Embodiment, since the outer peripheral surface of the attachment jig | tool 70 can be made to contact a protrusion, the effect similar to the said 2nd Embodiment can be acquired. Further, the outer peripheral surface of the mounting jig 70 may be brought into contact with the inner peripheral surface of the case 12.

  In the first and second embodiments, the inner lid 13 is provided with the first annular protrusion 27. However, the inner lid 13 is provided with an annular concave portion, and in the second embodiment, the inner portion of the concave portion is provided. You may make the outer peripheral surface of the attachment jig 70 contact a peripheral surface. Even if comprised in this way, the effect similar to the said 1st and 2nd embodiment can be acquired.

  In the first and second embodiments, the attachment position of the magnet 34 and the magnetic sensor 44 may be reversed. That is, a configuration in which the magnetic sensor 44 is provided on the rotating shaft 20 and the magnet 34 is provided on the opposite portion of the magnetic sensor 44 may be employed.

In the first and second embodiments, the magnetic sensor 44 has a square plate shape with one side having the same length, but may have a rectangular plate shape with one side having a different length.
In the first and second embodiments, the detection target of the rotation angle detection device 30 is the rotation shaft 20 of the rotating electrical machine 11, but is not limited thereto, and may be anything that rotates.

DESCRIPTION OF SYMBOLS 11 ... Rotating electrical machine, 12 ... Case, 13 ... Inner lid, 20 ... Rotating shaft, 26 ... Tip part, 27 ... First annular protrusion, 30 ... Rotation angle detection device, 43 ... Substrate, 44 ... Magnetic sensor, 53 ... 2nd annular protrusion, 70, 90, 110 ... Mounting jig.

Claims (4)

A case that accommodates the rotation shaft, a lid that is coaxially attached to the case and covers the opening of the case, a facing portion that is provided on the lid and faces an end of the rotation shaft, and the rotation shaft A rotation angle detection device comprising: a magnet attached to one of the end portion of the rotating shaft and the opposing portion; and a magnetic sensor attached to the other end portion of the rotating shaft and the opposing portion to detect a magnetic field formed by the magnet. In the assembly method of
Attaching the lid to the case, and using an attachment jig that can define the position of the magnet or the magnetic sensor attached to the facing portion with reference to the rotating shaft or a portion that is coaxial with the rotating shaft. An assembly method of a rotation angle detecting device that positions the facing portion with respect to the lid portion, attaches the facing portion to the lid portion in the positioned state, and attaches the lid portion to the case. In the assembly method of the rotation angle detection device according to claim 1,
A method of assembling a rotation angle detecting device using the mounting jig as a part of the magnet or the magnetic sensor attached to the end of the rotating shaft as being coaxial with the rotating shaft. In the assembly method of the rotation angle detection device according to claim 1,
The case includes an annular protrusion that is provided coaxially with the rotation shaft and protrudes toward the lid.
A method of assembling a rotation angle detection device using the mounting jig with the annular protrusion as a portion coaxial with the rotation axis. In the assembly method of the rotation angle detection device according to any one of claims 1 to 3,
A method of assembling the rotation angle detecting device, wherein after the positioned facing portion is attached to the lid portion, the lid portion is removed from the case to remove the attachment jig, and the lid portion is reattached to the case.