Motor apparatus and method for manufacturing rotor

Abstract

To accurately arrange a ring magnet and a rotor core coaxially even when a variation occurs in dimensional accuracy of a component.SOLUTION: A rotor 40 comprises a rotation shaft 41, a rotor core 42 mounted on the rotation shaft 41, a ring magnet 43 mounted on an outer peripheral portion of the rotor core 42, and a first opposing member 44 mounted on the rotation shaft 41 and opposing the ring magnet 43 in an axial direction of the rotation shaft 41. The first opposing member 44 is provided with a first tapered portion 44e inclined with respect to the axial direction of the rotation shaft 41, and the ring magnet 43 is provided with a first inner circumferential corner part 43b that is abutted against the first tapered portion 44e in the axial direction of the rotation shaft 41. Thereby, a self-aligning function achieved by the abutment between the first tapered portion 44e and the first inner circumferential corner part 43b allows an axial center of the ring magnet 43 and an axial center of the rotor core 42 to be aligned without misalignment.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a motor device and a method for manufacturing a rotor. [Background technology]

[0002] For example, Patent Document 1 describes a brushless motor for an electric brake device mounted on a vehicle such as an automobile. The brushless motor described in Patent Document 1 includes a stator fixed to a motor case and a rotor rotatably housed inside the stator.

[0003] The rotor has a shaft, a rotor core fixed to the shaft, a ring magnet fixed to the outer periphery of the rotor core with adhesive, and a magnet cover attached to the end of the rotor core.

[0004] Furthermore, the magnet cover has multiple protrusions that extend in the axial direction of the shaft and are recessed into the ring magnet, making the axis of the ring magnet coaxial with the axis of the rotor core. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-161921 Summary of the Invention [Problem to be solved by the invention]

[0006] In the technology described in Patent Document 1, in order to arrange the axis of the ring magnet and the axis of the rotor core coaxially, multiple protrusions provided on a resin magnet cover are inserted into the inside of the ring magnet from the axial direction of the shaft. Therefore, if the dimensional accuracy of the magnet cover and ring magnet varies, there is a risk that the ring magnet will rattle in the radial direction or that the protrusions will not be able to be inserted into the inside of the ring magnet.

[0007] An object of the present invention is to provide a motor device and a method of manufacturing a rotor that enable a ring magnet and a rotor core to be coaxially arranged with high precision even when there is variation in the dimensional precision of the parts. [Means for solving the problem]

[0008] One aspect of the motor device is a motor device comprising a stator and a rotor rotatably arranged radially inside the stator, wherein the rotor has a rotating shaft, a rotor core attached to the rotating shaft, a ring magnet attached to the outer periphery of the rotor core, and an opposing member attached to the rotating shaft and facing the ring magnet in the axial direction of the rotating shaft, wherein one of the ring magnet or the opposing member is provided with a tapered portion inclined with respect to the axial direction of the rotating shaft, and the other of the ring magnet or the opposing member is provided with an abutment portion that abuts against the tapered portion in the axial direction of the rotating shaft.

[0009] One aspect of a rotor manufacturing method is a method for manufacturing a rotor that is rotatably arranged radially inside a stator, and includes the following steps: a first step of pressing a rotor core onto a rotating shaft and positioning the rotor core at a specified position on the rotating shaft; a second step of pressing an opposing member from the output side that drives a driven object in the axial direction of the rotating shaft and abutting the opposing member against the rotor core; a third step of applying adhesive to the outer periphery of the rotor core; and a fourth step of attaching a ring magnet from the side opposite the output side in the axial direction of the rotating shaft and abutting a tapered portion provided on either the ring magnet or the opposing member against an abutment portion provided on the other of the ring magnet or the opposing member. [Effects of the Invention]

[0010] According to the present invention, it is possible to realize a motor device and a rotor manufacturing method that can precisely arrange the ring magnet and rotor core coaxially even when there is variation in the dimensional accuracy of the parts. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a seat motor mounted on a vehicle. [Figure 2] 2 is a cross-sectional view taken along the axial direction of the rotation shaft of the seat motor of FIG. 1. FIG. [Figure 3] 3 is an enlarged cross-sectional view corresponding to FIG. 2 showing the periphery of a first opposing member. FIG. [Figure 4] 3 is an enlarged cross-sectional view corresponding to FIG. 2 showing the periphery of a second opposing member. FIG. [Figure 5] FIG. 4 is a perspective view of the first opposing member alone, as viewed from the speed reduction mechanism side. [Figure 6] FIG. 4 is a perspective view of the first opposing member alone, as viewed from the rotor core side. [Figure 7] FIG. 4 is a perspective view of the second opposing member alone, as viewed from the rotor core side. [Figure 8] FIG. 10 is a perspective view of the second opposing member alone, as viewed from the sensor board side. [Figure 9]FIG. 2 is an exploded perspective view showing a rotor and first and second planetary gear reducers. [Figure 10] FIG. 10 is a diagram illustrating the rotor core mounting process. [Figure 11] FIG. 10 is a diagram illustrating the first opposing member mounting step. [Figure 12] FIG. 10 is a diagram illustrating the adhesive application step. [Figure 13] 10A to 10C are diagrams illustrating the <ring magnet mounting step>. [Figure 14] 10A and 10B are diagrams illustrating the second opposing member abutting step. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0013] Figure 1 is a perspective view showing a seat motor mounted on a vehicle, Figure 2 is a cross-sectional view along the axial direction of the rotation shaft of the seat motor in Figure 1, Figure 3 is an enlarged cross-sectional view corresponding to Figure 2 showing the periphery of the first opposing member, Figure 4 is an enlarged cross-sectional view corresponding to Figure 2 showing the periphery of the second opposing member, Figure 5 is a perspective view of the first opposing member alone as seen from the reduction mechanism side, Figure 6 is a perspective view of the first opposing member alone as seen from the rotor core side, Figure 7 is a perspective view of the second opposing member alone as seen from the rotor core side, Figure 8 is a perspective view of the second opposing member alone as seen from the sensor board side, and Figure 9 is an exploded perspective view showing the rotor and the first and second planetary gear reducers.

[0014] <Outline of the electric seat> The seat motor 10 shown in Fig. 1 is a drive source built into an electric seat installed in a vehicle such as an automobile. Specifically, the seat motor 10 drives a backrest reclining mechanism, a movement mechanism that moves the electric seat back and forth, and a lifting mechanism that raises and lowers the seat. This allows the driver to adjust the posture and position of the electric seat to their preferred driving position by operating an operation switch located, for example, on the side of the electric seat.

[0015] The seat motor 10 corresponds to the motor device in the present invention.

[0016] The seat motor 10 includes a connector CN, which is electrically connected to an in-vehicle controller CU. Between the electric motor section 20 constituting the seat motor 10 and the connector CN, there are arranged a power supply line PL for supplying a drive current to the electric motor section 20 and a sensor line SW for transmitting the rotation state of the electric motor section 20 to the in-vehicle controller CU.

[0017] This allows the in-vehicle controller CU to store a plurality of driving positions (positions of the electric seat) corresponding to drivers of different physiques, and allows the driver to set the driving position as desired as necessary.

[0018] <Seat motor> 1 to 4, the seat motor 10 includes an electric motor section 20 and a speed reduction mechanism section 50. The electric motor section 20 and the speed reduction mechanism section 50 are arranged coaxially, and the overall shape of the seat motor 10 is a short, rectangular, and generally rod-like shape.

[0019] <Electric motor section> The electric motor unit 20 includes a motor housing 21. The motor housing 21 is formed into a cylindrical shape with a bottom by deep drawing a steel plate, and its cross section along a direction perpendicular to the longitudinal direction is substantially square.

[0020] 2 and 3, a bottom wall portion 22 is provided on one axial side (left side in the drawings) of the motor housing 21. A bearing support cylinder 22a is provided integrally with the center of the bottom wall portion 22, and an outer ring 23a of a first ball bearing 23 is fixed to the bearing support cylinder 22a by press fitting. Approximately two-thirds of the first ball bearing 23 on the other axial side (right side in the drawings) is press-fitted into the bearing support cylinder 22a, and approximately one-third of the first ball bearing 23 on one axial side is exposed (protrudes) from the bearing support cylinder 22a on that one axial side.

[0021] Here, the first ball bearing 23 rotatably supports one axial side of the rotating shaft 41, and the inner ring 23b of the first ball bearing 23 is attached to one axial side of the rotating shaft 41. In the axial direction of the rotating shaft 41, the side on which the speed reduction mechanism 50 of the seat motor 10 is arranged is defined as the "one axial side," and the side on which the connector CN of the seat motor 10 is arranged is defined as the "other axial side."

[0022] A pair of screw holes 22b (only one is shown in FIGS. 2 and 3) are provided in the bottom wall portion 22. Specifically, the pair of screw holes 22b are arranged opposite each other with the bearing support cylinder 22a at the center. A fixing screw S for fixing the speed reduction mechanism portion 50 to the electric motor portion 20 is screwed into each screw hole 22b.

[0023] 2 and 4, an opening 24 is provided on the other axial side of the motor housing 21, i.e., on the side opposite to the bottom wall portion 22. The stator 30 and the rotor 40 are fitted inside the motor housing 21 through this opening 24.

[0024] A cover member 25 made of a resin material such as plastic is attached to the opening 24. The cover member 25 closes the opening 24, thereby preventing dust and other particles from entering the inside of the motor housing 21. A plurality of engagement recesses 25a are provided on the outer periphery of the cover member 25, and engagement claws 21a of the motor housing 21 engage with these engagement recesses 25a. This prevents the cover member 25 from coming off the motor housing 21 without rattling.

[0025] A bearing support hole 25b is provided in the center of cover member 25, and an outer ring 26a of second ball bearing 26 is fixed in bearing support hole 25b by press fitting. Second ball bearing 26 rotatably supports the other axial side of rotating shaft 41, and an inner ring 26b of second ball bearing 26 is attached to the other axial side of rotating shaft 41.

[0026] Furthermore, a conductive member holding plate 27 is attached to the other axial side of the cover member 25. Three conductive members 28 (only one is shown in the figure) corresponding to the U-phase, V-phase, and W-phase (three phases) are attached to the cover member 25 side of the conductive member holding plate 27 (left side in the figure). Furthermore, a power line PL and a sensor line SW are arranged on the connector CN side of the conductive member holding plate 27 (right side in the figure).

[0027] Three power supply lines PL corresponding to the U, V, and W phases are electrically connected to one end of each of the three conductive members 28. Meanwhile, coils 34 corresponding to the U, V, and W phases are electrically connected to the other end of each of the three conductive members 28.

[0028] An annular sensor board 29 is mounted on one axial side of the cover member 25. A total of five sensor wires SW (only four are shown in the figure) are electrically connected to the connector CN side (right side in the figure) of the sensor board 29. Furthermore, three Hall elements 29a (only one is shown in the figure) corresponding to the U phase, V phase, and W phase are mounted on the stator 30 side (left side in the figure) of the sensor board 29.

[0029] Here, the three Hall elements 29a form a rotation sensor that detects the rotation state of the rotor 40 (rotating shaft 41), and face the ring magnet 43 in the axial direction of the rotating shaft 41. As a result, each Hall element 29a generates a rectangular signal in response to a change in magnetic pole that accompanies the rotation of the ring magnet 43. The rectangular signal generated by the Hall elements 29a is sent to the on-board controller CU (see FIG. 1), which enables the on-board controller CU to grasp the rotation state of the rotor 40 and control the rotation speed and rotation direction of the rotor 40, as well as the stopping position of the rotor 40.

[0030] As shown in Figures 2 to 4, a stator 30 made of a ferromagnetic material is fixed inside the motor housing 21. The stator 30 includes a stator body 31 formed in a generally cylindrical shape and a plurality of teeth 32 protruding radially inward from the stator body 31. In this embodiment, the number of teeth 32 (equal to the number of slots) is set to six. Of course, the number of teeth 32 can be set arbitrarily in accordance with the specifications of the electric motor unit 20.

[0031] Additionally, an insulator 33 made of a resin material such as plastic is attached to each tooth 32. A coil 34 is wound around each tooth 32 via these insulators 33. Coils 34 of the same phase are wound around each pair of teeth 32 that are arranged opposite each other with the rotor 40 at the center. That is, the coils 34 are arranged at equal intervals (60-degree intervals) around the circumferential direction of the stator 30 in the order of U-phase, V-phase, W-phase, U-phase, V-phase, and W-phase.

[0032] The stator 30 is fixed by press-fitting a portion of the outer periphery of the stator body 31 against the inner wall of the motor housing 21. Therefore, the stator 30 does not rattle in the axial or circumferential direction relative to the motor housing 21. Furthermore, the coils 34 corresponding to the U phase, V phase, and W phase are electrically connected to conductive members 28 corresponding to the U phase, V phase, and W phase, respectively.

[0033] <Rotor> 2 to 4, a rotor 40 is rotatably mounted on the radially inner side of the stator 30 via a small gap (air gap). The rotor 40 includes a rotating shaft 41 made of a stepped round steel bar. Specifically, a small diameter portion 41a is integrally formed on one axial side of the rotating shaft 41, and a first sun gear 71 that forms a first planetary gear reducer 70 of the reduction mechanism 50 is fixed to the small diameter portion 41a.

[0034] The small diameter portion 41a drives the first planetary gear reducer 70 including the first sun gear 71, and corresponds to the output portion in the present invention. The planetary gear reducer 60 including the first planetary gear reducer 70 driven by the small diameter portion 41a corresponds to the driven object in the present invention.

[0035] One axial side of the rotary shaft 41 is rotatably supported by a first ball bearing 23, and the other axial side of the rotary shaft 41 is rotatably supported by a second ball bearing 26.

[0036] Furthermore, a rotor core 42 made by laminating multiple steel plates made of a ferromagnetic material is attached to the outer periphery of the rotating shaft 41. Specifically, by press-fitting fixing holes 42a of the rotor core 42 onto the rotating shaft 41, the rotor core 42 is firmly fixed at a specified position in the axial direction of the rotating shaft 41.

[0037] Furthermore, a ring magnet 43 is fixed to the outer periphery of the rotor core 42 via adhesive G (see FIGS. 12 and 13). The ring magnet 43 is, for example, a neodymium magnet and is formed in a generally cylindrical shape. The ring magnet 43 is magnetized so that south poles, north poles, south poles, and north poles (a total of four poles) are arranged alternately in the circumferential direction. In other words, the electric motor unit 20 is a four-pole, six-slot brushless motor. Of course, the number of poles of the ring magnet 43 can be set arbitrarily to match the specifications of the electric motor unit 20.

[0038] Furthermore, a minute gap (not shown) with adhesive G interposed therebetween is formed between the ring magnet 43 and the rotor core 42 in a direction perpendicular to the axial direction of the rotating shaft 41. This prevents the ring magnet 43 from rubbing strongly against the rotor core 42 when the ring magnet 43 is attached to the outer periphery of the rotor core 42.

[0039] 3, a first end portion 43a is provided on one axial side of the ring magnet 43, and a first inner circumferential corner portion 43b is provided radially inward of the first end portion 43a. A first tapered portion 44e of the first opposing member 44 abuts against the first inner circumferential corner portion 43b. Specifically, the first inner circumferential corner portion 43b is in line contact with the first tapered portion 44e.

[0040] In this way, the first inner peripheral corner portion 43b abuts against the first tapered portion 44e in the axial direction of the rotary shaft 41. The first inner peripheral corner portion 43b corresponds to the abutting portion in this invention.

[0041] 4, a second end portion 43c is provided on the other axial side of the ring magnet 43, and a second inner circumferential corner portion 43d is provided radially inward of the second end portion 43c. A second tapered portion 45e of the second opposing member 45 abuts against the second inner circumferential corner portion 43d. Specifically, the second inner circumferential corner portion 43d is in line contact with the second tapered portion 45e.

[0042] In this way, the second inner peripheral corner portion 43d abuts against the second tapered portion 45e in the axial direction of the rotary shaft 41. The second inner peripheral corner portion 43d corresponds to the abutting portion in this invention.

[0043] 2, the axial length L1 of the ring magnet 43 is longer than the axial length L2 of the rotor core 42 (L1>L2). In the axial direction of the rotating shaft 41, the first opposing member 44 abuts against the rotor core 42, and the second opposing member 45 is spaced apart from the rotor core 42.

[0044] <First opposing member> 2 and 3, a first opposing member 44 is disposed on one axial side of the rotating shaft 41, i.e., on the side of the small diameter portion 41a. The first opposing member 44 is made of PPS resin (polyphenylene sulfide) containing glass fiber, and faces the ring magnet 43 in the axial direction of the rotating shaft 41.

[0045] 5 and 6, the first opposing member 44 includes a first fixed cylindrical portion 44a that is fixed to the rotating shaft 41 by press-fitting. One axial side of the first fixed cylindrical portion 44a is provided with an annular first abutment portion 44b that abuts against the inner ring 23b of the first ball bearing 23 in the axial direction of the rotating shaft 41. As a result, the axial position of the rotating shaft 41 to which the first opposing member 44 is fixed is determined by the first ball bearing 23.

[0046] The first opposing member 44 also includes a first annular flat plate portion 44c. The first annular flat plate portion 44c has a larger diameter than the first fixed cylinder portion 44a and is formed in a generally plate shape. The first annular flat plate portion 44c is integrally provided on the other axial side of the first fixed cylinder portion 44a in the axial direction of the rotating shaft 41.

[0047] Further, on the other axial side of the first annular flat portion 44c, there is provided an annular second abutment portion 44d that abuts against a first end face EF1 (see FIG. 3) on one axial side of the rotor core 42. In other words, the first opposing member 44 abuts against the rotor core 42 in the axial direction of the rotating shaft 41.

[0048] The second abutment portion 44d protrudes from the first annular flat plate portion 44c toward the other axial direction, and the second abutment portion 44d is in surface contact with the first end face EF1 of the rotor core 42. As a result, the axial position of the rotor core 42 against which the first opposing member 44 abuts is determined by the first ball bearing 23 via the first opposing member 44.

[0049] 3 and 5, one axial side of the first annular flat plate portion 44c has no irregularities or the like formed thereon. That is, one axial side of the first annular flat plate portion 44c is an annular flat surface.

[0050] 3 and 6, an annular first tapered portion 44e is provided on the outer periphery of the second abutment portion 44d. The first tapered portion 44e is an inclined surface that is inclined at an angle of approximately 45 degrees with respect to the axial direction of the rotation shaft 41. Specifically, as shown in FIG. 3, the first tapered portion 44e is inclined so as to gradually approach the first annular flat plate portion 44c as it extends radially outward from the second abutment portion 44d.

[0051] The first tapered portion 44e corresponds to the tapered portion in this invention.

[0052] 3, a first inner peripheral corner portion 43b of a first end portion 43a provided on one axial side of the ring magnet 43 is in line contact with the first tapered portion 44e from the other axial side of the rotating shaft 41. In other words, by pressing the ring magnet 43 from the other axial side to the one axial side, the ring magnet 43 is automatically aligned by the first opposing member 44, and thereby the axis of the ring magnet 43 and the axis of the rotor core 42 fixed to the rotating shaft 41 are aligned so that they do not shift from each other.

[0053] In this way, first opposing member 44 has an automatic centering function for centering ring magnet 43, and corresponds to the opposing member and one opposing member of the present invention.

[0054] <Second opposing member> 2 and 4, a second opposing member 45 is disposed on the other axial side of the rotating shaft 41, i.e., the side opposite to the small diameter portion 41a side. Like the first opposing member 44, the second opposing member 45 is also made of PPS resin containing glass fiber, and faces the ring magnet 43 in the axial direction of the rotating shaft 41.

[0055] 7 and 8, the second opposing member 45 includes a second fixed cylindrical portion 45a that is fixed by press-fitting to the rotary shaft 41. An annular spring support portion 45b that supports one axial side of the rattle suppression spring SP is provided on the other axial side of the second fixed cylindrical portion 45a.

[0056] The other axial end of the anti-rattle spring SP is supported by the inner ring 26b of the second ball bearing 26. The anti-rattle spring SP is disposed between the spring support portion 45b and the inner ring 26b with an initial load applied. As a result, the rotor 40 and the anti-rattle spring SP are disposed between the inner ring 23b of the first ball bearing 23 and the inner ring 26b of the second ball bearing 26 so as to be stretched.

[0057] This prevents the inner rings 23b and 26b of the first and second ball bearings 23 and 26 from rattling in the axial direction relative to the outer rings 23a and 26a, respectively, which allows the rotor 40 to rotate stably at high speed and also reduces the generation of mechanical noise.

[0058] The second opposing member 45 also includes a second annular flat plate portion 45c. The second annular flat plate portion 45c has a larger diameter than the second fixed cylinder portion 45a and is formed in a generally plate-like shape. The second annular flat plate portion 45c is integrally provided on one axial side of the second fixed cylinder portion 45a in the axial direction of the rotating shaft 41.

[0059] Furthermore, an annular protrusion 45d that protrudes at a predetermined height toward the rotor core 42 is provided on one axial side of the second annular flat portion 45c. An adhesive reservoir SC, which is an annular space, is formed between the annular protrusion 45d and a second end face EF2 on the other axial side of the rotor core 42 in the axial direction of the rotating shaft 41. In other words, the second opposing member 45 is separated from the rotor core 42 in the axial direction of the rotating shaft 41.

[0060] 4 and 8, the other axial side of the second annular flat plate portion 45c does not have any irregularities or the like formed thereon. That is, the other axial side of the second annular flat plate portion 45c is an annular flat surface.

[0061] 4 and 7, an annular second tapered portion 45e is provided on the outer periphery of the annular protrusion 45d. The second tapered portion 45e is an inclined surface that is inclined at an angle of approximately 45 degrees with respect to the axial direction of the rotation shaft 41. Specifically, as shown in FIG. 4, the second tapered portion 45e is inclined so as to gradually approach the second annular flat portion 45c as it moves radially outward from the annular protrusion 45d.

[0062] The second tapered portion 45e corresponds to the tapered portion in this invention.

[0063] 4, a second inner peripheral corner 43d of a second end 43c provided on the other axial side of ring magnet 43 is in line contact with second tapered portion 45e from one axial side of rotating shaft 41. In other words, by pressing second opposing member 45 against the other axial side of ring magnet 43, ring magnet 43 is automatically aligned by second opposing member 45, and thereby the axis of ring magnet 43 and the axis of rotor core 42 fixed to rotating shaft 41 are aligned so that they do not shift from each other.

[0064] In other words, like the first opposing member 44, the second opposing member 45 also has an automatic centering function for centering the ring magnet 43, and corresponds to the opposing member, the other opposing member, and the other opposing member in the present invention.

[0065] In this manner, in this embodiment, by providing first and second opposing members 44, 45 on both axial sides of ring magnet 43, the axial center of ring magnet 43 and the axial center of rotor core 42 fixed to rotating shaft 41 are aligned so as not to be misaligned with each other. The mechanism (action) of the self-alignment by first and second opposing members 44, 45 will be described in detail later.

[0066] <Deceleration mechanism section> 2 and 3, the speed reduction mechanism 50 includes a reducer housing 51. The reducer housing 51 is formed into a cylindrical shape with a bottom by deep drawing a steel plate, and its cross section along a direction perpendicular to the longitudinal direction is substantially square.

[0067] An annular bottom wall 52 is provided on the other axial side of the reducer housing 51. The annular bottom wall 52 abuts against the bottom wall portion 22 of the motor housing 21 in the axial direction of the rotating shaft 41. A fitting cylinder 52a into which the bearing support cylinder 22a of the motor housing 21 is fitted is integrally provided in the center of the annular bottom wall 52. This allows the reducer housing 51 to be positioned coaxially with the motor housing 21.

[0068] The annular bottom wall 52 is provided with a pair of screw insertion holes (not shown) through which fixing screws S are inserted for fixing the reduction mechanism unit 50 to the electric motor unit 20. Specifically, the pair of screw insertion holes face a pair of screw holes 22b formed in the bottom wall portion 22 of the motor housing 21 in the axial direction of the rotating shaft 41, respectively.

[0069] An opening 53 is provided on one axial side of the reducer housing 51, i.e., the side opposite the annular bottom wall 52. The planetary gear reducer 60 is fitted inside the reducer housing 51 through this opening 53. An engagement shoulder SH is provided on one axial side of the planetary gear reducer 60, and an engagement claw 51a of the reducer housing 51 engages with this engagement shoulder SH. This prevents the planetary gear reducer 60 from coming loose from the reducer housing 51.

[0070] The planetary gear reducer 60 is formed in a generally box shape and includes a gear box 61 with an internal gear 61a formed on its radially inner side. The gear box 61 is made of a resin material such as plastic and includes a large-diameter portion 61b and a small-diameter portion 61c. Specifically, the large-diameter portion 61b is located on the other axial side of the gear box 61, and the small-diameter portion 61c is located on one axial side of the gear box 61. The internal gear 61a is provided across the entire axial area of ​​the large-diameter portion 61b.

[0071] Meanwhile, a third ball bearing 62 having an outer ring 62a and an inner ring 62b is housed inside the small diameter portion 61c. Specifically, the outer ring 62a of the third ball bearing 62 is fixed by press fitting inside the small diameter portion 61c, and the inner ring 62b of the third ball bearing 62 rotatably supports an output shaft 84 that forms the second planetary gear reducer 80. The output shaft 84 of the second planetary gear reducer 80 is connected to a reclining mechanism or the like (not shown) so as to be able to transmit power.

[0072] An annular closing member 63 that closes a box opening 61d of the gear box 61 is provided on the other axial side of the gear box 61. The closing member 63 is fixed to the box opening 61d by press fitting. Specifically, the closing member 63 is sandwiched between the gear box 61 and the annular bottom wall 52 in the axial direction of the rotating shaft 41. A through hole 63a is provided in the center of the closing member 63, and the through hole 63a is fitted into approximately one-third of one axial side of the first ball bearing 23.

[0073] This causes the axis of the closing member 63 (planetary gear reducer 60) and the axis of the first ball bearing 23 to coincide with each other without any misalignment. Therefore, the driving force of the rotating shaft 41, which is rotatably supported by the first ball bearing 23, is efficiently transmitted to the planetary gear reducer 60. Inside the gear box 61 and the closing member 63, there are housed a first planetary gear reducer 70 arranged on the input side (the electric motor unit 20 side), and a second planetary gear reducer 80 arranged on the output side (the side where a reclining mechanism, etc. is provided).

[0074] Specifically, the first planetary gear reducer 70 and the second planetary gear reducer 80 are arranged in the axial direction of the rotating shaft 41 so as to be capable of transmitting power, and the planetary gear reducer 60 performs two-stage reduction. This allows the diameter of the planetary gear reducer 60 to be reduced.

[0075] <First planetary gear reducer> 3 and 9, first planetary gear reducer 70 has a first sun gear 71 that is attached to small diameter portion 41a of rotating shaft 41 and functions as an input portion of first planetary gear reducer 70. First sun gear 71 is rotated by rotating shaft 41, is press-fitted and fixed to small diameter portion 41a, and is precisely positioned coaxially with small diameter portion 41a.

[0076] The first planetary gear reducer 70 also includes three first planetary gears 72 (only two are shown in the figure) that are meshed with both the internal gear 61a provided in the gearbox 61 and the first sun gear 71 and roll around the first sun gear 71. These first planetary gears 72 are each rotatably supported by a first carrier 73 that forms the first planetary gear reducer 70. Specifically, the three first planetary gears 72 are arranged at equal intervals (at 120-degree intervals) around the circumferential direction of the first carrier 73.

[0077] One axial side of each first planetary gear 72 rotatably abuts against the first carrier 73, and the other axial side of each first planetary gear 72 rotatably abuts against the blocking member 63. Therefore, the three first planetary gears 72 rotate smoothly without rattling in the axial direction of the rotary shaft 41.

[0078] Here, because first abutment portion 44b of first opposing member 44 abuts against inner ring 23b of first ball bearing 23, one axial side of first sun gear 71 is disposed at a specified position that is distance L3 away from one axial side of inner ring 23b. Therefore, first sun gear 71 does not come into contact with first carrier 73 in the axial direction of rotating shaft 41, and is properly meshed with each of first planetary gears 72.

[0079] The planetary gear reducer 60 is centered by the first ball bearing 23 via the blocking member 63. Furthermore, the rotating shaft 41 of the rotor 40 is also centered by the first ball bearing 23. As a result, the axis of the planetary gear reducer 60 and the axis of the rotor 40 including the first sun gear 71 are precisely aligned with each other by the first ball bearing 23. Therefore, like the rotor 40, the planetary gear reducer 60 can also rotate stably at high speed, and the generation of mechanical noise is suppressed.

[0080] Further, a second sun gear 81 is provided on one axial side of first carrier 73. The second sun gear 81 functions as an output portion of first planetary gear reducer 70 and also functions as an input portion of second planetary gear reducer 80. Second sun gear 81 is hollow, and is disposed at the axis of first carrier 73.

[0081] <Second planetary gear reducer> As shown in FIGS. 3 and 9, the second planetary gear reducer 80 has a second sun gear 81 that is provided integrally with the first carrier 73 of the first planetary gear reducer 70.

[0082] The second planetary gear reducer 80 also includes three second planetary gears 82 (only two are shown in the figure) that are meshed with both the internal gear 61a provided in the gearbox 61 and the second sun gear 81 and roll around the second sun gear 81. These second planetary gears 82 are each rotatably supported by a second carrier 83 that forms the second planetary gear reducer 80. Specifically, the three second planetary gears 82 are arranged at equal intervals (at 120-degree intervals) around the circumferential direction of the second carrier 83.

[0083] One axial side of the second planetary gear 82 rotatably abuts against the second carrier 83, and the other axial side of the second planetary gear 82 rotatably abuts against the first carrier 73 via the seat member ST. Therefore, all three second planetary gears 82 rotate smoothly without rattling in the axial direction of the rotary shaft 41.

[0084] An output shaft 84 that functions as an output portion of the second planetary gear reducer 80 is integrally provided on one axial side of the second carrier 83. The output shaft 84 is rotatably supported by the inner ring 62b of the third ball bearing 62, and is connected to a reclining mechanism or the like (not shown) so as to be capable of transmitting power.

[0085] Here, a pin hole 83a is formed in the axial center of second carrier 83, and one axial side of a support pin PN is attached to this pin hole 83a. The other axial side of the support pin PN is attached to a hollow portion 81a formed in second sun gear 81. The support pin PN has the function of aligning the axial center of first carrier 73 (second sun gear 81) with the axial center of second carrier 83 (output shaft 84) and supporting them so that they can rotate relative to each other.

[0086] In this way, the planetary gear reducer 60 performs two-stage reduction using the first and second planetary gear reducers 70, 80, reducing the rotational speed of the rotor 40 (rotating shaft 41), which rotates at high speed, to a predetermined rotational speed, and the reduced, high-torque rotational force is output from the output shaft 84 to a reclining mechanism or the like (not shown).

[0087] <Rotor assembly procedure> Next, the assembly procedure of the rotor 40, that is, the manufacturing method of the rotor 40, will be described in detail with reference to the drawings.

[0088] Figure 10 is a diagram explaining the rotor core mounting process, Figure 11 is a diagram explaining the first opposing member mounting process, Figure 12 is a diagram explaining the adhesive application process, Figure 13 is a diagram explaining the ring magnet mounting process, and Figure 14 is a diagram explaining the second opposing member abutting process.

[0089] <Rotor core installation process> As shown in Fig. 10, first, the rotating shaft 41 and rotor core 42 manufactured through separate manufacturing processes are prepared. Next, the rotating shaft 41 is set on the first work table 100. Specifically, the other axial side of the rotating shaft 41, i.e., the side of the rotating shaft 41 opposite to the small diameter portion 41a in the axial direction, is inserted into the insertion hole 101 of the first work table 100. This completes the setting of the rotating shaft 41 on the first work table 100.

[0090] Thereafter, the rotor core 42 is gripped as indicated by the dashed-two-dot arrow M1 by a pair of lifting arms 102 that can be raised and lowered relative to the first work table 100. Next, the pair of lifting arms 102 are lowered as indicated by the solid-line arrow M2, so that the other axial side of the rotor core 42 faces one axial side of the rotating shaft 41. Then, the pair of lifting arms 102 are continuously lowered, and the fixing holes 42a of the rotor core 42 are press-fitted from the small-diameter portion 41a side of the rotating shaft 41.

[0091] Thereafter, the lifting arms 102 are further lowered to position the rotor core 42 at a specified axial position of the rotating shaft 41 shown in Fig. 10. Specifically, the pair of lifting arms 102 are lowered so that the distance between the first end face EF1 of the rotor core 42 and one axial end of the small diameter portion 41a becomes L4. Note that the distance L4 at the specified position is managed with high precision by a controller (not shown) that controls the pair of lifting arms 102.

[0092] This completes the press-fitting (mounting) of the rotor core 42 onto the rotary shaft 41, completing the <rotor core mounting process>.

[0093] The rotor core mounting step corresponds to the first step in the present invention.

[0094] <First opposing member mounting step> 11, a first opposing member 44 manufactured through a separate manufacturing process is prepared. Then, the first opposing member 44 is gripped by a pair of lifting arms 102 as indicated by the two-dot chain arrow M3. At this time, the pair of lifting arms 102 grip the first fixed cylinder portion 44a of the first opposing member 44.

[0095] Thereafter, the pair of lifting arms 102 are lowered as shown by solid arrow M4, so that the other axial side (the side of the first annular flat plate portion 44c) of the first opposing member 44 faces one axial side of the rotating shaft 41. Then, the pair of lifting arms 102 are continuously lowered, so that the first fixed cylindrical portion 44a of the first opposing member 44 is press-fitted into the rotating shaft 41 from the side of the small diameter portion 41a of the rotating shaft 41 in the axial direction.

[0096] Next, the lifting arm 102 continues to be lowered further, and the first opposing member 44 is positioned at a specified position in the axial direction of the rotating shaft 41 as shown in Fig. 11. Specifically, the second abutting portion 44d of the first opposing member 44 is abutted against the first end face EF1 of the rotor core 42. As a result, the first opposing member 44 is accurately positioned with respect to the rotating shaft 41 and the rotor core 42 so that the distance between the first abutting portion 44b of the first opposing member 44 and one axial end of the small diameter portion 41a is L3 (see Fig. 3).

[0097] As a result, the first opposing member 44 abuts against the rotor core 42, the press-fitting (mounting) of the first opposing member 44 onto the rotary shaft 41 is completed, and the <first opposing member mounting step> is completed.

[0098] The "first opposing member mounting step" corresponds to the second step in the present invention.

[0099] <Adhesive application process> Next, as indicated by solid arrow M5 in Figure 12, the rotating shaft 41 with the rotor core 42 and the first opposing member 44 attached thereto is turned upside down. Then, the first fixed cylindrical portion 44a of the first opposing member 44 is inserted into the insertion hole 104 of the second work table 103. This completes the setting of the rotating shaft 41 with the rotor core 42 and the first opposing member 44 attached thereto on the second work table 103.

[0100] Next, the adhesive supply nozzle 105 is positioned to face the outer periphery of the other axial side (upper side in the figure) of the rotor core 42. Then, adhesive G is discharged from the adhesive supply nozzle 105, and the adhesive G is applied to the outer periphery of the rotor core 42. Specifically, with adhesive G being discharged from the adhesive supply nozzle 105, the adhesive supply nozzle 105 is moved in a spiral pattern from the other axial side of the rotor core 42 to one axial side (lower side in the figure) as shown by the solid arrow M6 (see dashed line).

[0101] As a result, a specified amount of adhesive G is applied in a spiral shape to the outer periphery of the rotor core 42, completing the <adhesive application step>.

[0102] The adhesive application step corresponds to the third step in the present invention.

[0103] <Ring magnet installation process> Next, as shown in Fig. 13, a ring magnet 43 manufactured through a separate manufacturing process is prepared. Then, the pair of lifting arms 102 grips the ring magnet 43 as shown by the two-dot chain line arrow M7.

[0104] Thereafter, the pair of lifting arms 102 are lowered as indicated by solid arrow M8, so that one axial side (the side of the first end 43a) of the ring magnet 43 faces the other axial side of the rotating shaft 41. Then, the pair of lifting arms 102 are continued to be lowered, and the ring magnet 43 is attached to the outer periphery of the rotor core 42 from the side opposite the small diameter portion 41a in the axial direction of the rotating shaft 41. At this time, there is a minute gap (not shown) between the outer periphery of the rotor core 42 and the inner periphery of the ring magnet 43, through which adhesive G is interposed, so that the ring magnet 43 can be easily attached to the rotor core 42 with a relatively small load.

[0105] Next, the pair of lifting arms 102 are further lowered, and the first inner peripheral corner 43b at the first end 43a of the ring magnet 43 is brought into abutment with the first tapered portion 44e of the first opposing member 44 with a predetermined pressing force. In other words, the first tapered portion 44e and the first inner peripheral corner 43b are brought into abutment with each other. As a result, the ring magnet 43 and the first opposing member 44 face each other in the axial direction of the rotation shaft, and the ring magnet 43 is automatically aligned by the first opposing member 44. Therefore, the axis of the ring magnet 43 and the axis of the rotor core 42 are aligned with each other.

[0106] At this time, adhesive G spreads evenly throughout the minute gap between the outer periphery of rotor core 42 and the inner periphery of ring magnet 43, filling the minute gap. Although excess adhesive G spills out on both axial sides of rotor core 42, the amount of adhesive G to be applied is determined in advance, taking into consideration the occurrence of excess adhesive. Therefore, the amount of excess adhesive G is kept to a necessary minimum.

[0107] Specifically, as indicated by solid arrow M9, adhesive G that has spilled out to one axial side of rotor core 42 reaches the gap between the first end 43a of ring magnet 43 and the first annular flat plate portion 44c of first opposing member 44 from a small gap between the outer periphery of rotor core 42 and the inner periphery of ring magnet 43. Note that the excess adhesive G that has reached the gap between first end 43a and first annular flat plate portion 44c does not spill out radially outward beyond ring magnet 43 and first annular flat plate portion 44c.

[0108] Furthermore, as indicated by solid arrow M10, adhesive G that has spilled out to the other axial side of rotor core 42 reaches adhesive reservoir SC (see FIG. 4) through a minute gap between the outer periphery of rotor core 42 and the inner periphery of ring magnet 43. The excess adhesive G that has reached adhesive reservoir SC does not spill out of adhesive reservoir SC.

[0109] In this way, excess adhesive G does not spill out radially beyond the ring magnet 43 and the first annular flat plate portion 44c, nor does it spill out of the adhesive reservoir SC. Therefore, after assembling the rotor 40, work such as removing the spilled adhesive G is not required, which simplifies the assembly process of the rotor 40.

[0110] As a result, the ring magnet 43 is attached to the outer periphery of the rotor core 42, completing the "ring magnet attachment process."

[0111] The ring magnet mounting step corresponds to the fourth step in the present invention.

[0112] <Second opposing member abutting process> 14, a second opposing member 45 manufactured through a separate manufacturing process is prepared. Then, the second opposing member 45 is gripped by a pair of lifting arms 102 as shown by the two-dot chain line arrow M11. At this time, the pair of lifting arms 102 grip the second fixed cylinder portion 45a of the second opposing member 45.

[0113] Thereafter, the pair of lifting arms 102 are lowered as shown by solid arrow M12, so that one axial side (the second annular flat plate portion 45c side) of the second opposing member 45 faces the other axial side of the rotating shaft 41. Then, the pair of lifting arms 102 are continuously lowered, so that the second fixed cylindrical portion 45a of the second opposing member 45 is press-fitted into the rotating shaft 41 from the side opposite to the small diameter portion 41a side of the rotating shaft 41 in the axial direction.

[0114] Next, the lifting arm 102 continues to be lowered, and the second tapered portion 45e of the second opposing member 45 abuts against the second inner peripheral corner portion 43d of the ring magnet 43. As a result, the ring magnet 43 and the second opposing member 45 face each other in the axial direction of the rotating shaft 41, and the ring magnet 43 is automatically aligned by the second opposing member 45. Therefore, the axis of the ring magnet 43 and the axis of the rotor core 42 are aligned with each other.

[0115] Here, by providing first and second opposing members 44, 45 on both axial sides of ring magnet 43, it is possible to align the axis of ring magnet 43 with the axis of rotor core 42 over the entire longitudinal area of ​​ring magnet 43. However, the automatic alignment of ring magnet 43 using first and second opposing members 44, 45 is performed before adhesive G hardens. Note that as adhesive G, for example, a thermosetting adhesive that hardens when heat is applied can be used.

[0116] As described above, the second opposing member 45 is abutted against the ring magnet 43, and the ring magnet 43 is held without rattle between the first opposing member 44 and the second opposing member 45. This completes the "second opposing member abutting process" and also completes the assembly work of the rotor 40.

[0117] The "second opposing member abutting step" corresponds to the fifth step in the present invention.

[0118] As described above in detail, according to this embodiment, the rotor 40 has a rotating shaft 41, a rotor core 42 attached to the rotating shaft 41, a ring magnet 43 attached to the outer periphery of the rotor core 42, and first and second opposing members 44, 45 attached to the rotating shaft 41 and facing the ring magnet 43 in the axial direction of the rotating shaft 41, the first and second opposing members 44, 45 being provided with first and second tapered portions 44e, 45e inclined with respect to the axial direction of the rotating shaft 41, and the ring magnet 43 being provided with first and second inner peripheral corner portions 43b, 43d that abut against the first and second tapered portions 44e, 45e in the axial direction of the rotating shaft 41.

[0119] This allows the automatic alignment function that accompanies the abutment of the first and second tapered portions 44e, 45e with the first and second inner peripheral corner portions 43b, 43d to align the axis of the ring magnet 43 with the axis of the rotor core 42 without misalignment. Therefore, even if there is some variation in the dimensional accuracy of the parts, it is possible to accurately position the ring magnet and rotor core coaxially. This makes it possible to suppress variation in product performance and ultimately eliminate the need for reassembly and the occurrence of defective products.

[0120] Furthermore, according to this embodiment, the first and second opposing members 44 and 45 are provided on both sides of the ring magnet 43 in the axial direction of the rotating shaft 41, respectively.

[0121] This allows the axis of the ring magnet 43 to be aligned with the axis of the rotor core 42 over the entire longitudinal direction of the ring magnet 43. This further reduces variations in product performance, resulting in a quieter seat motor 10.

[0122] Furthermore, according to this embodiment, a small diameter portion 41a that drives the planetary gear reducer 60 is provided on one axial side of the rotating shaft 41, and the first opposing member 44 arranged on the small diameter portion 41a side of the rotating shaft 41 abuts against the rotor core 42 in the axial direction of the rotating shaft 41, and the second opposing member 45 arranged on the opposite side of the small diameter portion 41a side of the rotating shaft 41 is separated from the rotor core 42 in the axial direction of the rotating shaft 41.

[0123] This makes it possible to press the first and second opposing members 44, 45 with appropriate loads from both axial sides of the ring magnet 43, and more reliably align the axial center of the ring magnet 43 with the axial center of the rotor core 42. Also, the gap formed between the ring magnet 43 and the second opposing member 45 in the axial direction of the rotating shaft 41 can be used as an adhesive reservoir SC.

[0124] Furthermore, according to this embodiment, it is possible to eliminate the need to reassemble the seat motor 10, the occurrence of defective products, etc., and therefore it is possible to reduce the manufacturing energy required to manufacture the seat motor 10. This makes it possible to achieve the Sustainable Development Goals (SDGs) established by the United Nations, particularly Goal 7 (Ensure access to affordable, reliable, sustainable and modern energy for all) and Goal 13 (Take urgent action to combat climate change and its impacts).

[0125] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention. For example, in the above-described embodiment, the first and second opposing members 44 and 45 are provided with first and second tapered portions 44e and 45e, and the ring magnet 43 is provided with first and second inner peripheral corner portions 43b and 43d on both axial sides, and these are used as a self-aligning function. However, the present invention is not limited to this. Conversely, tapered portions may be provided on both axial sides of the ring magnet, and abutting portions that abut against the tapered portions may be provided on each of the first and second opposing members. Furthermore, a tapered portion may be provided on the first opposing member, an abutting portion may be provided on one axial side of the ring magnet, and a tapered portion may be provided on the other axial side of the ring magnet, and an abutting portion may be provided on the second opposing member.

[0126] Furthermore, in the above embodiment, the seat motor 10 is shown as an example of a motor device, but the present invention is not limited to this and can also be applied to the drive sources of other in-vehicle devices, such as power window devices and sunroof devices.

[0127] Furthermore, the material, shape, size, number, installation location, etc. of each component in the above-described embodiments are arbitrary as long as they can achieve the present invention, and are not limited to the above-described embodiments. [Explanation of symbols]

[0128] 10: seat motor (motor device), 20: electric motor section, 21: motor housing, 21a: engagement claw, 22: bottom wall section, 22a: bearing support cylinder, 22b: screw hole, 23: first ball bearing, 23a: outer ring, 23b: inner ring, 24: opening, 25: cover member, 25a: engagement recess, 25b: bearing support hole, 26: second ball bearing, 26a: outer ring, 26b: inner ring, 27: conductive member holding plate, 28: conductive member, 29: sensor board, 29a: hall element, 30: stator, 31: stator body, 32: teeth, 33: insulator, 34: coil ,40: rotor, 41: rotating shaft, 41a: small diameter portion (output portion), 42: rotor core, 42a: fixing hole, 43: ring magnet, 43a: first end portion, 43b: first inner peripheral corner portion (abutment portion), 43c: second end portion, 43d: second inner peripheral corner portion (abutment portion), 44: first opposing member (opposing member, one opposing member), 44a: first fixed cylindrical portion, 44b: first abutment portion, 44c: first annular flat plate portion, 44d: second abutment portion, 44e: first tapered portion (tapered portion), 45: second opposing member (opposing member, other opposing member, other opposing member), 45a: second fixed cylindrical portion, 45b: spring support portion, 45c: second annular flat plate portion, 45d: annular convex portion, 45e: second tapered portion (tapered portion), 50: reduction mechanism portion, 51: reducer housing, 51a: engaging claw, 52: annular bottom wall, 52a: fitting tube, 53: opening, 60: planetary gear reducer (driven object), 61: gear box, 61a: internal gear, 61b: large diameter portion, 61c: small diameter portion, 61d: box opening, 62: third ball bearing, 62a: outer ring, 62b: inner ring, 63: closing member, 63a: through hole, 70: first planetary gear reducer, 71: first sun gear, 72: first planetary gear, 73: first carrier ,80: Second planetary gear reducer, 81: Second sun gear, 81a: Hollow portion, 82: Second planetary gear, 83: Second carrier, 83a: Pin hole, 84: Output shaft, 100: First work table, 101: Insertion hole, 102: Lifting arm, 103: Second work table, 104: Insertion hole, 105: Adhesive supply nozzle, CN: Connector, CU: On-board controller, EF1: First end face, EF2: Second end face, G: Adhesive, PL: Power line, PN: Support pin, S: Fixing screw, SC: Adhesive reservoir, SH: Engagement shoulder, SP: Rattle suppression spring, ST: Seat member, SW: Sensor wire

Claims

1. a stator; a rotor rotatably provided radially inside the stator; A motor device comprising: The rotor is A rotation axis; a rotor core attached to the rotary shaft; a ring magnet attached to the outer periphery of the rotor core; an opposing member attached to the rotating shaft and facing the ring magnet in the axial direction of the rotating shaft; and a tapered portion inclined with respect to the axial direction of the rotation shaft is provided on one of the ring magnet and the opposing member; the other of the ring magnet and the opposing member is provided with an abutting portion that abuts against the tapered portion in the axial direction of the rotation shaft; Motor device.

2. the opposing members are provided on both sides of the ring magnet in the axial direction of the rotation shaft; The motor device according to claim 1 .

3. 3. The motor device according to claim 2, an output section for driving a driven object is provided on one axial side of the rotation shaft; one of the opposing members arranged on the output portion side of the rotating shaft is abutted against the rotor core in the axial direction of the rotating shaft, the other opposing member, which is disposed on the opposite side of the rotary shaft from the output portion side, is spaced apart from the rotor core in the axial direction of the rotary shaft. Motor device.

4. A method for manufacturing a rotor that is rotatably provided radially inside a stator, comprising: a first step of press-fitting a rotor core onto a rotary shaft and positioning the rotor core at a predetermined position on the rotary shaft; a second step of press-fitting an opposing member from an output portion side that drives a driven object in the axial direction of the rotation shaft, and bringing the opposing member into contact with the rotor core; a third step of applying an adhesive to an outer periphery of the rotor core; a fourth step of attaching a ring magnet to the side opposite to the output portion in the axial direction of the rotation shaft, and abutting a tapered portion provided on one of the ring magnet or the opposing member against an abutting portion provided on the other of the ring magnet or the opposing member; Equipped with A method for manufacturing a rotor.

5. 5. The method for manufacturing a rotor according to claim 4, preparing another opposing member; After the fourth step, a fifth step is performed in which another opposing member is press-fitted from the side opposite to the output portion in the axial direction of the rotation shaft, and the tapered portion or the abutting portion provided on the other opposing member is abutted against the abutting portion or the tapered portion provided on the ring magnet. A method for manufacturing a rotor.

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