JP5518766B2 - Detection rotor, rotation detector and its mounting structure - Google Patents

Description

  The present invention relates to a detection rotor, a rotation detector, and a mounting structure for the motor, which are used for detecting rotation of a rotating shaft such as a motor.

  Conventionally, as this type of technology, for example, a sheet coil resolver described in Patent Document 1 below is known. The resolver includes two sheet coils formed by forming a coil pattern on the surface of a disk-shaped substrate made of a resin, and is configured so that the two sheet coils are opposed to each other through a gap. . Here, one of the two sheet coils is the detection phase side, the other is the excitation phase side, the detection phase side sheet coil is fixed to the tip of the rotating shaft, and the excitation phase side sheet coil is fixed to the bracket. .

JP-A-9-229715

  However, the resolver described in Patent Document 1 is configured so that the resin-made substrate is fixed to the rotation shaft as it is for the detection-side sheet coil. It is considered difficult to ensure the reliability of connection relationships. That is, there is a possibility that damage such as deformation or cracking due to stress occurs in the resin substrate at the contact portion with the rotating shaft. In this case, there is a concern that the durability and reliability of the rotation detector may be reduced.

  The present invention has been made in view of the above circumstances, and its object is to improve the reliability of the contact portion of the detection rotor with respect to the rotation shaft, and to improve the durability and reliability of the rotation detector. The present invention provides a detection rotor, a rotation detector, and a mounting structure thereof.

  In order to achieve the above object, the invention according to claim 1 is an attachment structure for a motor of a rotation detector having a detection stator and a detection rotor, and the motor includes a rotation shaft and a motor including the rotation shaft. Including a housing, a detection stator having a planar coil disposed on the surface and being fixed to the motor housing, a detection rotor having a flat resin substrate, and a planar coil disposed on the surface of the resin substrate. A metal member provided integrally in the center of the resin substrate and formed in an annular shape to fix the detection rotor to the rotating shaft, a plurality of protrusions projecting radially on the inner peripheral side of the metal member, and a metal A portion corresponding to each protrusion of the member is formed to be wide in the radial direction, and the detection rotor is disposed on the rotating shaft so that the surface side faces the surface side of the detection stator, and the metal member Is And purpose to be fixed to the rotary shaft at the projection by being press-fitted on the outer periphery of the rotating shaft.

  According to the configuration of the above invention, the detection rotor is fixed to the rotation shaft by press-fitting the annular metal member integrally provided at the center of the resin substrate to the outer periphery of the rotation shaft. A strong bonding force can be obtained. Further, since the plurality of protrusions protruding in the radial direction at the inner periphery of the metal member bite into the outer periphery of the rotating shaft by press-fitting, the coupling force with the rotating shaft is increased. Here, the metal member is press-fitted into the outer periphery of the rotating shaft by a plurality of protrusions, but since the portion corresponding to each protrusion is formed wide in the radial direction, the rigidity of the metal member is increased in the wide portion. Thus, the stress from the metal member to the resin substrate is relieved.

  In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, a through hole penetrating in the axial direction is formed at a portion corresponding to each protrusion of the metal member. The purpose.

  According to the configuration of the above invention, in addition to the operation of the invention according to claim 1, since the through hole is formed in the portion corresponding to each protrusion of the metal member, the detection rotor press-fits the metal member to the rotating shaft. In this case, the stress applied to the metal member is relieved at the portion of the through hole.

  In order to achieve the above object, according to a third aspect of the present invention, in the first or second aspect of the present invention, the metal member has an axial direction in which the portion to be joined to the resin substrate and the portion where each protrusion is provided It is intended to be offset and arranged.

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 1 or 2, the metal member is arranged such that the portion to be joined to the resin substrate and the portion where each protrusion is provided are offset in the axial direction. Therefore, the stress applied to the resin substrate when the metal member is press-fitted into the rotating shaft is relieved.

  To achieve the above object, according to a fourth aspect of the present invention, in the third aspect of the present invention, the metal member has elasticity, and the metal member is elastically deformed and fixed to the rotating shaft. The purpose is that.

  According to the configuration of the invention, in addition to the action of the invention according to claim 3, since the metal member is fixed to the rotating shaft by elastic deformation, the holding force of the metal member on the rotating shaft is improved.

  In order to achieve the above object, the invention according to claim 5 is a rotation detector comprising a detection stator and a detection rotor, wherein the detection stator has a planar coil disposed on a surface thereof and is fixed to the housing. And the detection rotor is integrally provided at the center of the resin substrate, the planar resin substrate disposed on the surface of the resin substrate, and the center of the resin substrate, to fix the detection rotor to the rotation shaft A metal member formed in an annular shape, a plurality of protrusions protruding radially on the inner peripheral side of the metal member, and a portion corresponding to each protrusion of the metal member being formed to be wide in the radial direction. The detection rotor is disposed on the rotation shaft so that the surface side faces the surface side of the detection stator, and the metal member is fixed to the rotation shaft by being press-fitted onto the outer periphery of the rotation shaft by a plurality of protrusions. Configured to The the spirit of the invention.

  According to the structure of the said invention, this rotation detector is applicable to the attachment structure in any one of Claims 1 thru | or 4.

  In order to achieve the above object, an invention according to claim 6 is a detection rotor that constitutes a rotation detector together with a detection stator, and includes a flat resin substrate and a planar coil disposed on the surface of the resin substrate. A metal member provided integrally in the center of the resin substrate and formed in an annular shape to fix the detection rotor to the rotating shaft, a plurality of protrusions projecting radially on the inner peripheral side of the metal member, and a metal A portion corresponding to each protrusion of the member is formed to be wide in the radial direction, and the resin substrate is disposed on the rotating shaft so as to face the detection stator, and the metal member is formed by a plurality of protrusions on the outer periphery of the rotating shaft. It is intended to be configured to be fixed to the rotating shaft by being press-fitted into the shaft.

  According to the configuration of the invention, the detection rotor can be applied to the rotation detector according to any one of claims 1 to 5.

  According to the first aspect of the present invention, the reliability of the contact portion of the detection rotor with respect to the rotating shaft can be improved, and the durability and reliability of the rotation detector can be improved.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, it is possible to prevent the resin substrate from cracking due to the difference in thermal expansion between the metal member and the resin substrate or the stress of the metal member. it can.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, it is possible to prevent the resin substrate from being cracked by the stress of the metal member.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, the coupling force between the metal member and the rotating shaft can be increased.

  According to the fifth aspect of the present invention, the reliability of the contact portion of the detection rotor with the rotation shaft can be improved, and the durability and reliability of the rotation detector can be improved.

  According to invention of Claim 6, it can utilize suitably for the rotation detector in any one of Claim 1 thru | or 5.

The front sectional view showing a rotation detector and a motor to which the rotation detector is attached according to the first embodiment. The perspective view which concerns on the same embodiment and shows the detection stator and detection rotor which comprise a rotation detector from diagonally upward. The perspective view which shows the detection stator and detection rotor which comprise a rotation detector according to the same embodiment seeing from diagonally downward. The bottom view which shows a detection rotor concerning the embodiment. The bottom view which shows the metal member which concerns on the embodiment and comprises a detection rotor. The bottom view which expands and shows the part of the chain line circle | round | yen of the metal member of FIG. 5 concerning the embodiment. FIG. 5 is an enlarged sectional view showing the detection rotor of FIG. 4 along the line AA according to the same embodiment; The expanded sectional view which shows the detection rotor of FIG. 4 along the BB line in the same embodiment. The top view which concerns on the embodiment and shows a detection stator. The bottom view which shows the detection stator according to the embodiment. The front sectional view showing a detection stator concerning the embodiment. The right view which concerns on the same embodiment and shows a detection stator. The bottom view which concerns on 2nd Embodiment and shows a detection rotor. The expanded sectional view which concerns on the same embodiment and shows the detection rotor of FIG. 13 along CC line. The bottom view which concerns on 3rd Embodiment and shows a detection rotor. FIG. 16 is an enlarged cross-sectional view showing the detection rotor of FIG. 15 along the line DD according to the same embodiment. The bottom view which concerns on 4th Embodiment and shows a detection rotor. FIG. 18 is an enlarged sectional view showing the detection rotor of FIG. 17 along the line EE according to the same embodiment. The bottom view which concerns on 5th Embodiment and shows a detection rotor. FIG. 20 is an enlarged sectional view showing the detection rotor of FIG. 19 along the line FF according to the same embodiment; The bottom view which concerns on another embodiment and shows a metal member. The bottom view which concerns on another embodiment and shows a metal member.

<First Embodiment>
Hereinafter, a detection rotor, a rotation detector, and a mounting structure thereof according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front sectional view showing a rotation detector 1 and a motor 2 to which the rotation detector 1 is attached in this embodiment (hereinafter, the direction of FIG. 1 is a front view for convenience). The motor 2 includes a motor housing 11 having a substantially disk-shaped appearance, a rotary shaft 14 included in the motor housing 11 and supported rotatably via bearings 12 and 13 at the inner center thereof, A motor rotor 15 fixed on the outer periphery of the rotary shaft 14 on the inner side, and a motor stator 16 fixed on the inner side of the motor housing 11 via a gap on the outer peripheral side of the motor rotor 15 are provided. The motor stator 16 is provided with a coil 17.

  In FIG. 1, a housing portion 11 a for housing the rotation detector 1 is integrally formed below the motor housing 11. The accommodating portion 11 a is configured by a substantially annular peripheral wall with the rotating shaft 14 and the bearing 13 as the center. A communication hole 11b communicating with the outside is formed in a part of the outer periphery of the housing portion 11a.

  As shown in FIG. 1, the rotating shaft 14 of the motor 2 has a substantially cylindrical shape made of metal and includes a large diameter portion 14a, a medium diameter portion 14b, and a small diameter portion 14c. The large diameter portion 14a is supported by one bearing 12, and the motor rotor 15 is fixed to the outer periphery thereof. The small-diameter portion 14c is supported by the other bearing 13, and the tip end portion projects outside from a shaft hole 11c formed in the bottom wall of the accommodating portion 11a.

  As shown in FIG. 1, the rotation detector 1 includes a detection stator 6 and a detection rotor 7. The detection rotor 7 is fixed to the outer periphery of the medium diameter portion 14 b of the rotating shaft 14 inside the motor housing 11. That is, the detection rotor 7 is press-fitted and fixed to the middle diameter portion 14 b of the rotary shaft 14. The detection stator 6 is arranged inside the housing portion 11a of the motor housing 11 so as to face the detection rotor 7, and is fixed by a bolt 9 as a fixing member. A plurality of bolt holes 11d through which the bolts 9 are inserted are formed in the bottom wall of the accommodating portion 11a.

  FIG. 2 is a perspective view of the detection stator 6 and the detection rotor 7 constituting the rotation detector 1 of this embodiment when viewed obliquely from above. FIG. 3 is a perspective view of the detection stator 6 and the detection rotor 7 constituting the rotation detector 1 of this embodiment when viewed obliquely from below. FIG. 4 is a bottom view of the detection rotor 7 of this embodiment. In FIG. 5, the metal member 23 which comprises the detection rotor 7 of this embodiment is shown with a bottom view. As shown in FIGS. 2 to 4, the detection rotor 7 includes a resin substrate 21 having an annular flat plate shape, a planar coil 22 (see FIG. 3) disposed on a surface 21 a of the resin substrate 21, and a resin substrate 21. The metal member 23 is integrally provided on the inner periphery of the center, and is formed in an annular shape to fix the detection rotor 7 to the outer periphery of the rotary shaft 14, and protrudes in the radial direction on the inner periphery side of the metal member 23. One key 23a.

  The resin substrate 21 is formed of PPS resin or the like. The metal member 23 is formed of SUS or the like. The planar coil 22 is formed on the resin substrate 21 by printing using an ink jet or the like, and an insulating layer is formed thereon.

  As shown in FIGS. 2 to 5, the metal member 23 includes a plurality of (in this case, nine) protrusions 23 b that protrude in the radial direction on the inner peripheral side thereof. In this embodiment, when the inner diameter of the metal member 23 is “42 (mm)”, the width of each protrusion 23b is “1 (mm)” and the protrusion height is about “0.5 to 1.0 (mm)”. It has become. These protrusions 23 b are arranged at equiangular intervals along the inner periphery of the metal member 23. Sites corresponding to the protrusions 23b of the metal member 23 are formed wider in the radial direction. That is, the wide portion is a plurality of (in this case, nine) convex portions 23 c that project radially on the outer peripheral side of the metal member 23. Further, the metal member 23 is formed with a through hole 23d penetrating in the axial direction corresponding to each convex portion 23c. These convex portions 23 c are arranged radially at equal angular intervals along the outer periphery of the metal member 23. The metal member 23 is insert-molded with respect to the resin substrate 21 at the outer peripheral portion including these convex portions 23c. As shown in FIG. 5, the through-hole 23d is disposed in the middle of the base of the convex portion 23c and has a circular shape. The key 23 a, the protrusions 23 b, and the protrusions 23 c are formed integrally with the metal member 23.

  FIG. 6 is an enlarged bottom view of the portion of the chain line circle S1 of the metal member 23 of FIG. As shown in FIG. 6, each convex portion 23 c of the metal member 23 has a tapered shape so that both sides 23 ca in the circumferential direction spread outward by an angle θ <b> 1 (for example, “1 to 2 °”).

  FIG. 7 shows the detection rotor 7 of FIG. 4 in an enlarged cross-sectional view along the line AA. FIG. 8 shows the detection rotor 7 of FIG. 4 in an enlarged cross-sectional view along the line BB. As shown in FIGS. 4, 7, and 8, in the detection rotor 7, the resin substrate 21 and the metal member 23 have the same thickness, and the inner circumference of the metal member 23, that is, the inner portion corresponding to the plurality of convex portions 23 c. Each protrusion 23b is formed on the circumferential side. These projections 23b have one end in the axial direction as a taper 23ba for press-fitting guidance. 4 and 8, the outer circumference of the metal member 23, that is, the outer circumference of a part (three in this case) of the plurality of convex portions 23c has a thickness smaller than the thickness of the resin substrate 21. A projection 23cb is formed. The protrusion 23cb is embedded in the resin substrate 21 so that the metal member 23 and the resin substrate 21 are engaged with each other.

  As shown in FIGS. 1 to 3, the detection rotor 7 is arranged so that the surface 21 a side of the resin substrate 21 faces the surface side of the detection stator 6, and on the outer periphery of the medium diameter portion 14 b of the rotating shaft 14. It is attached. Here, the inner circumference of the metal member 23 is press-fitted into the outer circumference of the medium-diameter portion 14b of the rotary shaft 14 at each projection 23b, and the detection rotor 7 is prevented from being detached. A key 23 a provided on the inner periphery of the metal member 23 engages with a key groove (not shown) formed in the medium diameter portion 14 b, and the detection rotor 7 is positioned and prevented from rotating with respect to the rotating shaft 14. The In this way, the detection rotor 7 is fixed to the rotating shaft 14.

  FIG. 9 is a plan view showing the detection stator 6 of this embodiment. FIG. 10 is a bottom view of the detection stator 6 of this embodiment. FIG. 11 is a front sectional view of the detection stator 6 of this embodiment. FIG. 12 is a right side view of the detection stator 6 of this embodiment. As shown in FIGS. 1 to 3 and FIGS. 9 to 11, the detection stator 6 is formed in a substantially annular flat plate shape with resin, and a detection unit 31 in which a planar coil 32 is disposed on a surface 31 a, and the detection unit 31. A plurality of fixing projections 33 provided on the back surface of the detection portion 31, an outer peripheral rib 34 as an outer peripheral wall portion formed along the outer peripheral edge on the back surface side of the detection portion 31, and the back surface of the detection portion 31. An inner peripheral rib 35 as an inner peripheral wall portion formed along the inner peripheral edge of the through hole 31b on the side and extending in the axial direction, and one connector portion 36 facing the lateral direction (horizontal direction) from the detection portion 31 Prepare. The outer peripheral rib 34 and the plurality of fixing convex portions 33 are formed continuously and integrally. As shown in FIGS. 9 and 10, a plurality (four in this case) of convex portions 34 a are provided on the outer periphery of the outer peripheral rib 34 of the detection stator 6 so as to be in contact with the inner periphery of the accommodating portion 11 a. These convex portions 34a are arranged at equiangular intervals on the outer periphery of the outer peripheral rib 34, and extend along the axial direction thereof. As shown in FIG. 2, the planar coil 32 disposed on the surface 31 a of the detection unit 31 is formed by printing using an inkjet or the like, and an insulating layer is formed thereon.

  As shown in FIGS. 1 to 3 and FIGS. 9 to 11, each fixing convex portion 33 has a cylindrical shape, and in this embodiment, the back surface of the detection unit 31 is equiangularly spaced along the outer periphery thereof. Three are arranged. Each fixing projection 33 is provided with a metal bush 37 having a screw hole 37a as a fastening fitting. The metal bush 37 is insert-molded with respect to the fixing convex portion 33. The metal bush 37 is configured such that a bolt 9 is fastened to fix the detection stator 6 to the motor housing 11.

  As shown in FIGS. 1 to 3 and 9 to 11, a cavity 38 is formed in each fixing convex portion 33 at a position adjacent to the detection unit 31. Ribs 38a are formed in the cavities 38 to divide the cavities 38 into stripes.

  As shown in FIGS. 1 and 11, a plurality of metal terminals 39 are insert-molded in the connector portion 36. Each terminal 39 is bent at a right angle, and the first end 39 a is disposed in the connector portion 36, and the second end 39 b is disposed in the detection portion 31. A coil wire constituting the planar coil 32 is connected to each of the second end portions 39b arranged in the detection unit 31.

  Here, attachment of the detection stator 6 to the housing portion 11a of the motor housing 11 will be described. As shown in FIG. 1, the detection stator 6 is arranged so that the surface 31 a side of the detection portion 31 faces the surface 21 a side of the resin substrate 21 of the detection rotor 7. At this time, as shown in FIGS. 9 and 10, the outer periphery of the detection stator 6 is fitted inside the housing portion 11 a. In this state, each fixing convex portion 33 is disposed on the bottom wall of the accommodating portion 11a so as to be aligned with each bolt hole 11d. Then, the bolts 9 are inserted into the respective bolt holes 11d, and the bolts 9 are fastened to the metal bushes 37 from the outside of the motor housing 11 by the respective fixing convex portions 33, whereby the detection stator 6 is fixed to the housing portion 11a. . At this time, by appropriately adjusting the tightening degree of the three bolts 9, the parallelism of the surface 31 a of the detection unit 31 and the distance and position with the surface of the detection rotor 7 are adjusted.

  According to the rotation detector mounting structure in this embodiment described above, the detection rotor 7 is configured such that the annular metal member 23 integrally provided at the center of the resin substrate 21 is press-fitted into the outer periphery of the rotation shaft 14. Is fixed to the rotating shaft 14. Therefore, a strong coupling force is obtained between the detection rotor 7 and the rotating shaft 14 due to contact between metals. In addition, since the plurality of protrusions 23b protruding in the radial direction on the inner periphery of the metal member 23 bite into the outer periphery of the rotating shaft 14 by press-fitting, the coupling force between the metal member 23 and the rotating shaft 14 increases. For this reason, in order to fix the detection rotor 7 to the outer periphery of the rotating shaft 14, it is not necessary to provide a stopper for preventing the removal, and the number of parts of the rotation detector 1 can be reduced correspondingly.

  Here, the metal member 23 is press-fitted into the outer periphery of the rotating shaft 14 by a plurality of protrusions 23b, and the portions corresponding to the protrusions 23b are formed wide in the radial direction. That is, the convex part 23c is provided in the outer periphery of the metal member 23 corresponding to each protrusion 23b. Therefore, even if stress is generated in the metal member 23 at each projection 23b, the rigidity of the metal member 23 is increased at the corresponding wide portion (the portion of each projection 23c). The stress on 21 is relieved. For this reason, the reliability of the contact part with respect to the rotating shaft 14 of the detection rotor 7 can be improved, and durability and reliability of the rotation detector 1 can be improved.

  In this embodiment, the detection rotor 7 has a taper shape so that both sides 23 ca of each convex portion 23 c of the metal member 23 spread outward, so that even if the resin substrate 21 spreads radially outward due to thermal expansion, the detection rotor 7 It is difficult for a gap to be generated between the substrate 21 and each convex portion 23c. For this reason, the shift | offset | difference and rattling of the circumferential direction by the thermal expansion between the metal member 23 and the resin substrate 21 can be suppressed.

  In this embodiment, since the detection rotor 7 is formed with through holes 23d corresponding to the respective convex portions 23c of the metal member 23, a difference in thermal expansion between the metal member 23 and the resin substrate 21 is caused by the through hole 23d. It is relaxed in the part. Further, when the metal member 23 is press-fitted into the rotating shaft 14, the stress applied to the metal member 23 is relieved at the through hole 23d. For this reason, it is possible to prevent the resin substrate 21 from cracking due to the difference in thermal expansion between the metal member 23 and the resin substrate 21 or the stress of the metal member 23.

  In this embodiment, the detection rotor 7 is engaged with each other by the protrusion 23 cb provided on the convex portion 23 c of the metal member 23 being embedded in the resin substrate 21. Therefore, the relative movement in the axial direction is restricted between the two substrates 21 and 23 when the resin substrate 21 having the same thickness and the metal member 23 are joined. For this reason, the resin substrate 21 can be prevented from coming off in the axial direction.

  In this embodiment, since the metal member 23 is provided in the center of the detection rotor 7, the surroundings of the magnetic field can be improved at the metal member 23 portion. In addition, since a plurality of convex portions 23c are provided on the outer periphery of the metal member 23, for example, when the resin substrate 21 is molded, the number of gates in the mold is set to be the same as the number of the convex portions 23c, so that the resin flow Can be improved. Thereby, the flatness of the surface 21a of the resin substrate 21 can be ensured. Furthermore, in this embodiment, a key 23 a corresponding to the key groove is formed integrally with the metal member 23 on the inner periphery of the metal member 23. For this reason, compared with the case where the key 23a is provided separately, the number of parts can be reduced.

  In addition, according to the rotation detector mounting structure in this embodiment, the detection stator 6 is provided with three fixing convex portions 33 on the back surface of the detecting portion 31, and the motor housing 11 is formed by these fixing convex portions 33. It is fixed to the accommodating portion 11a of the motor housing 11 by bolts 9 from the outside. Therefore, by adjusting the fixing degree of the bolt 9 with respect to each fixing convex portion 33 as appropriate, the parallelism of the surface 31a of the detection unit 31 and the distance and position with the surface side of the detection rotor 7 are adjusted. For this reason, it is possible to facilitate alignment and position adjustment of the detection stator 6 to ensure parallelism and an accurate distance with respect to the detection rotor 7, and to ensure the reliability as the detection stator 6. The detection accuracy as the detector 1 can be ensured.

  In this embodiment, the bolt 9 is not directly involved in the detection portion 31 of the detection stator 6 and the bolt 9 is fastened to each fixing convex portion 33, so that the surface 31a of the detection portion 31 is hardly distorted. Also in this sense, reliability as the detection stator 6 can be ensured, and detection accuracy as the rotation detector 1 can be ensured.

  In this embodiment, since the outer peripheral rib 34 is formed along the outer peripheral edge of the detection stator 6 on the back surface side of the detection unit 31, the detection unit 31 is reinforced. Moreover, since the inner peripheral rib 35 is formed along the inner peripheral edge on the back surface side of the detection unit 31, the detection unit 31 is reinforced. For this reason, it becomes difficult to produce distortion in the surface 31a of the detection part 31, the reliability as the detection stator 6 can be improved, and the detection accuracy as the rotation detector 1 can be improved.

  In this embodiment, since the outer peripheral rib 34 of the detection portion 31 and the plurality of fixing projections 33 are continuously formed integrally with the detection stator 6, the stress when the bolt 9 is associated with each fixing projection 33. However, the fixing protrusions 33 and the outer peripheral ribs 34 share the same. For this reason, the stress which affects the surface of the detection part 31 can be reduced, the reliability as the detection stator 6 can be further improved, and the detection accuracy as the rotation detector 1 can be further improved. .

  In this embodiment, since the cavity 38 is formed in each fixing projection 33 adjacent to the detection section 31 for the detection stator 6, expansion / contraction when the fixing projection 33 is resin-molded. Is absorbed by the cavity 38. For this reason, with respect to the detection stator 6, the influence of the expansion / contraction of each fixing convex portion 33 on the detection unit 31 can be reduced, and the flatness of the surface 31 a of the detection unit 31 can be ensured.

  In this embodiment, since the striped ribs 38 a are formed in the cavity 38, the coupling force between the fixing protrusions 33 and the detection unit 31 is secured at the cavity 38. For this reason, it is possible to ensure the integrity of each fixing convex portion 33 and the detection portion 31 for the detection stator 6.

  In this embodiment, since the metal bush 37 is provided on each fixing projection 33 for the detection stator 6, the coupling force between each fixing projection 33 and the bolt 9 is increased, and the metal bush 37 and the bolt 9 are connected to each other. Adjustment of the fixing force of the detection stator 6 is facilitated by the cooperation. For this reason, the detection stator 6 can be more reliably fixed to the motor housing 11, and the position adjustment work of the detection stator 6 can be facilitated.

  In this embodiment, since three detection convex portions 33 are provided on the detection unit 31 for the detection stator 6, it is difficult for torsional stress to be generated in the detection unit 31. For this reason, the flatness of the surface 31a of the detection part 31 is substantially securable. If the number of fixing projections 33 is two, it is difficult to adjust the parallelism of the detection unit 31, and if the number of fixing projections 33 is four or more, stress in the twisting direction is likely to occur in the detection unit. Become. For this reason, it can be said that the number of fixing convex portions 33 is three, even in consideration of workability.

  The detection stator 6 and the detection rotor 7 of this embodiment can be suitably applied to the rotation detector 1 in the above-described rotation detector mounting structure. Moreover, the rotation detector 1 of this embodiment can be suitably applied to the above-described rotation detector mounting structure.

Second Embodiment
Next, a second embodiment in which the detection rotor, the rotation detector, and the mounting structure thereof according to the present invention are embodied will be described in detail with reference to the drawings.

  In the following description, components equivalent to those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described.

  This embodiment differs from the first embodiment in the configuration of the metal member 23 in the detection rotor 7. FIG. 13 is a bottom view of the detection rotor 7 in this embodiment. FIG. 14 shows the detection rotor 7 of FIG. 13 in an enlarged cross-sectional view along the line CC. As shown in FIG. 14, in this embodiment, the metal member 23 is arranged such that a portion that is bonded to the resin substrate 21 and a portion where each protrusion 23 b is provided are offset in the axial direction. That is, the metal member 23 of this embodiment has a dimension that is about twice as long in the axial direction as that of the first embodiment, and a plurality of convex portions 23c on the outer peripheral side of the upper half portion in FIG. The key 23a is formed on the inner peripheral side of the portion, and a plurality of protrusions 23b are formed on the inner peripheral side of the lower half portion. In this embodiment, instead of having the above-described offset configuration, the through holes 23d formed corresponding to the respective convex portions 23c in the first embodiment are omitted. Accordingly, in this embodiment, the metal member 23 is disposed so that the portion to be joined to the resin substrate 21 and the portion where each protrusion 23b is provided are offset in the axial direction. In doing so, stress is applied to the lower half portion of the metal member 23 on which the protrusions 23b are provided, and stress is hardly applied to the upper half portion, and the stress applied to the resin substrate 21 is relaxed. For this reason, the crack of the resin substrate 21 due to the stress of the metal member 23 can be effectively prevented.

  Other functions and effects in this embodiment are basically the same as those in the first embodiment.

<Third Embodiment>
Next, a third embodiment in which the detection rotor, the rotation detector, and the mounting structure thereof according to the present invention are embodied will be described in detail with reference to the drawings.

  This embodiment differs from the above embodiments in the configuration of the metal member 23 in the detection rotor 7. FIG. 15 is a bottom view of the detection rotor 7 in this embodiment. FIG. 16 shows the detection rotor 7 of FIG. 14 in an enlarged cross-sectional view along the line DD. As shown in FIGS. 15 and 16, in this embodiment, for the metal member 23, instead of the plurality of protrusions 23 b in the second embodiment, the protrusions 23 e are continuously provided along the inner periphery of the metal member 23. It is formed. One end of the protrusion 23e in the axial direction is a taper 23ea for press-fitting guidance. In these points, the present embodiment is different from the second embodiment in configuration. Therefore, in this embodiment, since the metal member 23 is press-fitted into the outer periphery of the rotating shaft 14 at almost the entire circumference of the protrusion 23e, the coupling force between the metal member 23 and the rotating shaft 14 can be increased.

  Other functions and effects in this embodiment are basically the same as those in the second embodiment.

<Fourth embodiment>
Next, a fourth embodiment in which the detection rotor, the rotation detector, and the mounting structure thereof according to the present invention are embodied will be described in detail with reference to the drawings.

  This embodiment differs from the second embodiment in the configuration of the metal member 26 in the detection rotor 7. FIG. 17 is a bottom view of the detection rotor 7 in this embodiment. FIG. 18 shows the detection rotor 7 of FIG. 17 in an enlarged cross-sectional view along the line EE. As shown in FIGS. 17 and 18, in this embodiment, the metal member 26 is formed in a substantially short cylindrical shape by a metal plate material having elasticity. A flange portion 26 a is formed on the outer periphery of one end portion of the metal member 26 in the axial direction. The metal member 26 is insert-molded on the resin substrate 21 such that the outer peripheral portion of the flange portion 26 a is embedded in the resin substrate 21. A key 26b and a plurality of protrusions 26c are formed on the inner periphery of the other end of the metal member 26 in the axial direction. The key 26b and each protrusion 26c are formed by bending inward the tongue piece portion extending in the axial direction. The keys 26 b and the protrusions 26 c are arranged at equiangular intervals along the inner periphery of the metal member 26. The metal member 26 is fixed to the rotating shaft 14 by being elastically deformed by these protrusions 26c. Corresponding to these protrusions 26c, the flange portion 26a is formed with a portion that is wide in the radial direction, that is, a convex portion 26d. In these points, the present embodiment is different from the second embodiment in configuration. Further, the metal member 26 is the same as that of the second embodiment in that the portion to be bonded to the resin substrate 21 and the portion where the protrusions 26c are provided are offset in the axial direction.

  Therefore, in this embodiment, when the metal member 26 is press-fitted into the rotating shaft 14, each protrusion 26 c of the metal member 26 is elastically deformed, so that the detection rotor 7 is fixed to the rotating shaft 14 together with the metal member 26. The holding force of the metal member 26 with respect to the rotating shaft 14 increases. For this reason, the coupling force between the metal member 26 and the rotating shaft 14 can be increased.

  Other functions and effects in this embodiment are basically the same as those in the second embodiment.

<Fifth Embodiment>
Next, a fifth embodiment in which the detection rotor, the rotation detector, and the mounting structure thereof according to the present invention are embodied will be described in detail with reference to the drawings.

  This embodiment differs from the fourth embodiment in the configuration of the metal member 26 in the detection rotor 7. FIG. 19 is a bottom view of the detection rotor 7 in this embodiment. FIG. 20 shows the detection rotor 7 of FIG. 19 in an enlarged cross-sectional view along the line FF. As shown in FIGS. 19 and 20, in this embodiment, the protrusion 26e is continuously provided along the inner periphery of the metal member 26 instead of the plurality of protrusions 26c in the fourth embodiment. It is formed. In these respects, the present embodiment is different from the fourth embodiment in configuration. In this embodiment, each convex portion 26d of the flange portion 26a is omitted. Therefore, in this embodiment, since the metal member 23 is press-fitted into the outer periphery of the rotating shaft 14 at almost the entire periphery of the protrusion 26e, the coupling force between the metal member 26 and the rotating shaft 14 can be increased.

  Other functions and effects in this embodiment are basically the same as those in the fourth embodiment.

  The present invention is not limited to the above-described embodiments, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention.

  For example, in the first embodiment, as shown in FIG. 5, the through holes 23 d provided corresponding to the respective convex portions 23 c of the metal member 23 of the detection rotor 7 are formed in a circular shape, but the present invention is not limited to this. It is not a thing. 21 and 22 show other examples of the metal member 23 by bottom views. That is, the through-holes 23d provided corresponding to the respective convex portions 23c of the metal member 23 have a substantially trapezoidal shape as shown in FIG. 21 or a substantially rectangular shape with a constriction as shown in FIG. Also good.

  Moreover, in the said embodiment, although the rotation detector 1 was arrange | positioned in the motor housing 11 of the motor 2, it is not limited to this, The rotation detector of this invention may be provided separately from a motor, Furthermore, You may use the rotation detector of this invention for rotation detection other than a motor.

  The present invention can be used for detecting rotation of a rotating shaft such as a motor.

DESCRIPTION OF SYMBOLS 1 Rotation detector 2 Motor 6 Detection stator 7 Detection rotor 11 Motor housing 14 Rotating shaft 21 Resin substrate 21a Surface 22 Planar coil 23 Metal member 23b Projection 23c Projection 23d Through hole 26 Metal member 26c Projection 26d Projection 32 Plane coil

Claims (6)

An attachment structure for a motor of a rotation detector provided with a detection stator and a detection rotor,
The motor includes a rotating shaft and a motor housing containing the rotating shaft;
The detection stator has a planar coil disposed on a surface thereof and is fixed to the motor housing;
The detection rotor is integrally provided at the center of the resin substrate, a planar coil disposed on the surface of the resin substrate, and the center of the resin substrate, and is annular to fix the detection rotor to the rotating shaft. A plurality of protrusions projecting radially on the inner peripheral side of the metal member, and portions corresponding to the protrusions of the metal member are formed to be wide in the radial direction. The detection rotor is disposed on the rotation shaft such that the surface side faces the surface side of the detection stator, and the metal member is press-fitted onto the outer periphery of the rotation shaft by the plurality of protrusions. A rotation detector mounting structure, wherein the rotation detector is fixed to the rotation shaft.   The rotation detector mounting structure according to claim 1, wherein a through-hole penetrating in the axial direction is formed in a portion corresponding to each of the protrusions of the metal member.   The attachment of the rotation detector according to claim 1 or 2, wherein the metal member is disposed such that a portion to be joined to the resin substrate and a portion where the protrusions are provided are offset in the axial direction. Construction.   The rotation detector mounting structure according to claim 3, wherein the metal member has elasticity, and the metal member is fixed to the rotation shaft by elastic deformation. A rotation detector comprising a detection stator and a detection rotor,
The detection stator is configured such that a planar coil is disposed on a surface and is fixed to a housing;
The detection rotor is provided integrally with a flat resin substrate, a planar coil disposed on the surface of the resin substrate, and at the center of the resin substrate, and is annular to fix the detection rotor to a rotation shaft. Including a formed metal member, a plurality of protrusions protruding radially on the inner peripheral side of the metal member, and a portion corresponding to each protrusion of the metal member formed to be wide in the radial direction. The detection rotor is disposed on the rotary shaft so that the surface side faces the surface side of the detection stator, and the metal member is press-fitted onto the outer periphery of the rotary shaft by the plurality of protrusions. Thus, the rotation detector is configured to be fixed to the rotating shaft. A detection rotor constituting a rotation detector together with a detection stator,
A flat resin substrate;
A planar coil disposed on the surface of the resin substrate;
A metal member formed integrally in the center of the resin substrate and formed in an annular shape to fix the detection rotor to a rotation shaft;
A plurality of protrusions protruding radially on the inner peripheral side of the metal member;
A portion corresponding to each of the protrusions of the metal member is formed to be wide in the radial direction, and the resin substrate is disposed on the rotating shaft so as to face the detection stator, and the metal member includes the plurality of metal members. A detection rotor configured to be fixed to the rotary shaft by being press-fitted into the outer periphery of the rotary shaft by a projection of

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