JP2008215511A - Rolling bearing device with pre-load imparting structure by driving body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device suitable for preventing erroneous detection of a rotation sensor when a moment load is applied. <P>SOLUTION: A thin motor 100 is provided with a deep groove ball bearing 14 having an inner ring 14a and an outer ring 14b, a stator 22 supported by the inner ring 14a, a rotor 12 supported by the outer ring 14b, a motor part 16 imparting rotation torque to the rotor 12, and a resolver 30 for detecting a rotation angle position of the rotor 12. The resolver 30, the deep groove ball bearing 14 and the motor part 16 are arranged on a radial same plane. A permanent magnet 16a and a coil 16b are arranged to confront in the axial direction with the prescribed gap. The permanent magnet 16a is arranged with a prescribed offset in the axial direction lower part so that the resolver 30, the deep groove ball bearing 14 and the coil 16b are positioned on the radial same plane in exitation of the coil 16b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing device including a rolling bearing and a rotation sensor, and more particularly to a rolling bearing device having a preload imparting structure by a driving body suitable for preventing erroneous detection of the rotation sensor when a moment load is applied. About.

Conventionally, as a thin motor, a thin motor including a rolling bearing and a rotation sensor is known.
FIG. 7 is a cross-sectional view of the conventional thin motor 200 in the axial direction.
As shown in FIG. 7, the thin motor 200 includes a housing inner 220 that is a stator, a rotor 12 that is a rotor, and a cross that is interposed between the rotor 12 and the housing inner 220 to rotatably support the rotor 12. And a roller bearing 140.

  The cross roller bearing 140 has an inner ring 140a and an outer ring 140b. The inner ring 140a is fitted to the outer peripheral surface of the housing inner 220, and is fixed to the housing inner 220 in a state of being pressed in the axial direction by the inner ring presser 26. The outer ring 140 b is fitted to the inner peripheral surface of the rotor 12 and is fixed to the rotor 12 while being pressed in the axial direction by the outer ring presser 28.

Between the rotor 12 and the housing inner 220, a motor unit 16 that applies rotational torque to the rotor 12 and a resolver 30 as a rotation sensor that detects the rotational angle position of the rotor 12 are provided.
The resolver 30 is disposed in a ring-shaped resolver rotor 18 having an inner circumference that is eccentric with respect to the axis of the cross roller bearing 140, and the resolver rotor 18 so as to face the resolver rotor 18 at a predetermined interval, and the reluctance between the resolver rotor 18 and the resolver rotor 18. And a resolver stator 20 for detecting a change. The resolver rotor 18 is integrally attached to the inner peripheral surface of the rotor 12, and the resolver stator 20 is integrally attached to the outer peripheral surface of the housing inner 220. By causing the resolver rotor 18 to be eccentric and changing the distance between the resolver rotor 18 and the resolver stator 20 in the circumferential direction, the reluctance changes depending on the position of the resolver rotor 18. Therefore, since the fundamental wave component of the reluctance change per rotation of the rotor 12 is one cycle, the resolver 30 outputs a resolver signal that changes according to the rotation angle position of the rotor 12.

In addition, as a conventional rolling bearing apparatus, the bearing apparatus of patent documents 1-3 is known, for example. The bearing device described in Patent Document 1 is one in which an axial preload is applied and the inner ring 140a and the outer ring 140b are fixed, and the bearing device described in Patent Document 2 has a bearing operating point set outside the output shaft. In the bearing device described in Patent Document 3, a motor is arranged on the outer periphery of the bearing.
JP 2005-69252 A JP 2006-25525 A JP 2002-281720 A

  However, in the conventional thin motor 200, when a moment load is applied to the thin motor 200, the thin motor 200 is tilted about the cross roller bearing 140, and the gap of the resolver 30 changes. Therefore, there has been a problem that the rotational angle position of the rotor 12 cannot be accurately detected. In particular, since the tilt is centered on the cross roller bearing 140, the gap change increases as the distance from the cross roller bearing 140 increases. Further, since the motor is a thin motor, it is necessary to receive a moment load by one cross roller bearing 140, and it is difficult to increase rigidity and prevent a gap change by increasing the number of cross roller bearings 140.

  Therefore, the present invention has been made paying attention to such an unsolved problem of the conventional technology, and is suitable for preventing erroneous detection of the rotation sensor when a moment load is applied. An object of the present invention is to provide a rolling bearing device having a preload applying structure by a body.

  [Invention 1] In order to achieve the above object, a rolling bearing device having a preload imparting structure by a driving body of Invention 1 includes a rolling bearing having an inner ring and an outer ring, an inner ring supported body supported by the inner ring, An outer ring supported body supported by an outer ring, a driving body that relatively rotates the inner ring supported body and the outer ring supported body, and the inner ring supported body and the outer ring supported body, And a rotation sensor that outputs a sensor signal that changes depending on the relative position of the rotation bearing, the rotation sensor, the rolling bearing, and the drive body are arranged on the same radial plane, and the drive body includes the inner ring A motor unit having a magnet fixed to one of the supported body and the outer ring supported body and a coil fixed to the other, wherein the magnet and the coil are arranged facing each other in the axial direction. It has been.

  With such a configuration, the inner ring supported body and the outer ring supported body are relatively rotatably supported by the rolling bearing. When the coil is excited, the magnet and the coil are disposed so as to face each other in the axial direction, so that the magnet and the coil are attracted in the axial direction by the magnetic attraction force generated between the magnets and rolled accordingly. An axial preload is applied to the bearing. Also, the axial gap is corrected. Next, with the preload applied, the inner ring supported body and the outer ring supported body are relatively rotated by the driving body. The rotation sensor outputs a sensor signal that changes depending on the relative positions of the inner ring supported body and the outer ring supported body.

When a moment load is applied to the rolling bearing device, the rolling bearing device tilts around the rolling bearing, but the rotation sensor is arranged on the same plane in the radial direction as the rolling bearing, so the gap change of the rotation sensor can be reduced. it can.
In addition, since the rotation sensor, the rolling bearing, and the driving body are disposed on the same plane in the radial direction, the height (axial length) of the rolling bearing device can be reduced.

Furthermore, when a method such as increasing the preload of the rolling bearing is adopted, the gap change can be suppressed, but on the other hand, there is a problem that the life of the rolling bearing is shortened. Since the gap change is reduced by disposing the roller, the life of the rolling bearing can be extended.
Here, the inner ring supported body and the outer ring supported body only need to be relatively rotatably supported by the rolling bearing, and the inner ring supported body is fixed and the outer ring supported body is rotatably supported. Alternatively, the outer ring supported body may be fixed and the inner ring supported body may be rotatably supported, or both may be rotatably supported.

Further, as the rotation sensor, for example, a resolver in which the reluctance between the inner ring supported body and the outer ring supported body changes depending on the relative position thereof, or a tape scale that detects a mark formed in the circumferential direction is applicable.
Further, in order to fix a magnet to one of the inner ring supported body and the outer ring supported body, it is not directly fixed to the one, but is arranged close to or in contact with the one and fixed to the one. It includes a fixed state that is substantially integrated with the member (including a rotation sensor and a rolling bearing) or a member integrated with the member.

  Further, in order to fix the coil to the other of the inner ring supported body and the outer ring supported body, the coil is not directly fixed to the other, but is arranged close to or in contact with the other and fixed to the other. It includes a fixed state that is substantially integrated with the other member (including a rotation sensor and a rolling bearing) or a member that is integrated with the other member.

  [Invention 2] Furthermore, the rolling bearing device having the preload applying structure by the driving body of the invention 2 is the rolling bearing device having the preload applying structure by the driving body of the invention 1, wherein the magnet and the coil are at the time of excitation of the coil. The rotation sensor, the rolling bearing, and the coil are arranged with a predetermined offset so that they are located on the same radial plane.

In such a configuration, when the coil is excited, the magnet and the coil are arranged with a predetermined offset, so that the rotation sensor, the rolling bearing and the coil are positioned on the same radial plane when the coil is excited. The gap change during rotation can be reduced.
Here, the offset may be set on one side of the magnet and the coil, or may be set on both sides of the magnet and the coil.

[Invention 3] Furthermore, the rolling bearing device having a preload applying structure by the driving body of Invention 3 is the rolling bearing device having the preload applying structure by the driving body of any one of Inventions 1 and 2, in which the rotation sensor, the rolling The bearing and the drive body were arranged on the same plane in the radial direction in that order from the radial inner side.
With such a configuration, since the rotation sensor is arranged on the opposite side of the drive body with the rolling bearing interposed therebetween, the rotation sensor is not easily affected by noise or heat from the drive body.

  [Invention 4] Further, a rolling bearing device having a preload applying structure by a driving body according to Invention 4 is the rolling bearing device having a preload applying structure by any one of Inventions 1 to 3, wherein the inner ring supported body and The outer ring supported body includes an inner wall body and an outer wall body formed inside and outside in the radial direction, and the inner ring body is supported between the inner wall body and the outer wall body of the outer ring supported body. One of the inner wall body of the outer ring supported body and the inner wall body of the inner ring supported body is disposed so that the outer wall body of the supported body is positioned between the inner wall body and the outer wall body of the inner ring supported body. The detection body of the rotation sensor is fixed to the other, the detection means of the rotation sensor is fixed to the other, the inner ring is fixed to the inner wall body of the inner ring supported body, and the outer ring is fixed to the outer wall body of the outer ring supported body, The outer ring supported body and the inner ring The magnet in one of the supported body, was fixing the coil to the other.

  With such a configuration, when the magnet is fixed to the outer ring supported body, the outer ring supported body and the outer ring rotate, and when the magnet is fixed to the inner ring supported body, the inner ring supported body. And the inner ring rotates. When they rotate, the detected body of the rotation sensor fixed to one of the inner wall body of the outer ring supported body and the inner wall body of the inner ring supported body is detected by the detection means of the rotation sensor fixed to the other. Thus, a sensor signal that changes depending on the relative position between the inner ring supported body and the outer ring supported body is output from the rotation sensor.

Here, the inner wall body or the outer wall body of the inner ring supported body may be configured integrally with the inner ring supported body, or may be configured separately from the inner ring supported body. When configured as a separate body, a member such as an inner ring presser may constitute the inner wall body of the inner ring supported body.
Further, the inner wall body or the outer wall body of the outer ring supported body may be formed integrally with the outer ring supported body, or may be formed separately from the outer ring supported body. When configured as a separate body, a member such as an outer ring presser may constitute the outer wall body of the outer ring supported body.

  Further, in order to fix to the inner wall body or the outer wall body (hereinafter abbreviated as “wall body” in this paragraph), the wall body is not directly fixed, but is arranged close to or in contact with the wall body, And the fixed state which makes a wall body substantially integral by being fixed to the member to which a wall body is fixed, or the member integral with a wall body is included.

  [Invention 5] Furthermore, the rolling bearing device having a preload applying structure by the driving body according to Invention 5 is the rolling bearing device having the preload applying structure by any one of Inventions 1 to 4, wherein the rotation sensor includes an inner An annular object to be detected in which one of a circumference and an outer periphery is decentered with respect to the axis of the rolling bearing, and a detection means for detecting a change in reluctance between the object to be detected; The detected body is provided on one of the inner ring supported body and the outer ring supported body, and the detecting means is provided on the other side so that the eccentric side of the inner circumference and the outer circumference of the inner face and the outer circumference faces the detecting means.

With such a configuration, when the inner ring supported body and the outer ring supported body are relatively rotated, the detection means and the detected body are also relatively rotated. And since the side which opposes a detection means is eccentric among the inner periphery and outer periphery of a to-be-detected body, a reluctance change arises by rotation and the reluctance change is detected by a detection means.
As described above, in the rotation sensor in which the fundamental wave component of the reluctance change per rotation is one cycle, the influence of the gap change due to the moment load is large. Therefore, the reduction of the gap change is effective in preventing erroneous detection.

  Here, regarding the detected body and the detecting means, the detected body may be provided on the inner ring supported body, and the detecting means may be provided on the outer ring supported body, or vice versa. In the former case, the detected object and the detecting means are provided by decentering the outer periphery of the detected object and causing the outer periphery of the detected object to face the detecting means. In the latter case, the detected object and the detecting means are provided by decentering the inner periphery of the detected object and making the inner periphery of the detected object face the detecting means.

  As described above, according to the rolling bearing device having the preload imparting structure by the driving body of the invention 1, even if a moment load is applied to the rolling bearing device, the rotation sensor is arranged at a position where the gap change is small. Compared to the conventional case, the change in the gap of the rotation sensor can be reduced, and the possibility that the rotation sensor can be erroneously detected can be reduced. In addition, since the rotation sensor, the rolling bearing, and the driving body are arranged on the same plane in the radial direction, an effect that the height of the rolling bearing device can be reduced is also obtained. Furthermore, the effect that the life of the rolling bearing can be extended can be obtained as compared with a method of increasing the preload of the rolling bearing. Furthermore, since the preload is applied to the rolling bearing during rotation due to the axially opposed arrangement of magnets and coils, it is possible to receive loads from multiple directions and reduce the number of parts compared to using a combined bearing. It is possible to obtain the effect that the reliability can be improved.

Furthermore, according to the rolling bearing device having the preload imparting structure by the driving body of the invention 2, the effect that the gap change during rotation can be reduced is obtained.
Furthermore, according to the rolling bearing device having the preload imparting structure by the driving body of the invention 3, since the rotation sensor is arranged on the opposite side of the driving body with the rolling bearing interposed therebetween, the rotation sensor is not free from noise or heat from the driving body. The effect that high detection accuracy can be realized is also obtained.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of a rolling bearing device having a preload applying structure by a driving body according to the present invention.
First, the configuration of a thin motor 100 to which the present invention is applied will be described.
FIG. 1 is a sectional view in the axial direction of a thin motor 100 according to the present embodiment.
As shown in FIG. 1, the thin motor 100 includes a stator 22 that is a stator, a rotor 12 that is a rotor, and a deep groove ball bearing that is interposed between the rotor 12 and the stator 22 and rotatably supports the rotor 12. 14, a motor unit 16 that applies rotational torque to the rotor 12, and a resolver 30 that detects a rotational angle position of the rotor 12. Here, the resolver 30, the deep groove ball bearing 14, and the motor part 16 are arrange | positioned on the same plane of radial direction in the order from radial inside.

  The stator 22 is formed with an annular inner wall body 22a protruding upward in the axial direction (upward in FIG. 1), and an annular outer wall body protruding upward in the axial direction on the outer side in the radial direction than the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall body 12a protruding downward in the axial direction (downward in FIG. 1), and the annular wall protruding downward in the axial direction is formed radially outward from the inner wall body 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall 22a of the stator 22 between the inner wall 12a and the outer wall 12b of the rotor 12, and an outer wall 12b of the rotor 12 between the inner wall 22a and the outer wall 22b of the stator 22. They are arranged so as to be positioned.

The deep groove ball bearing 14 includes an inner ring 14a, an outer ring 14b, and a plurality of rolling elements 14c provided so as to be able to roll between the inner ring 14a and the outer ring 14b.
The inner ring 14 a is fixed to the inner wall body 22 a of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the inner wall body 22a of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring presser 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring presser 26 is connected to the inner wall of the stator 22 with a bolt 26a. It is fixed by fastening to the body 22a.

The outer ring 14b is fixed to the outer wall body 12b of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the outer wall body 12b of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the outer wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12b.
The stator 22 is fixed to the fixed plate 24 by bolts 24a, and the rotor 12 is fitted to the outer peripheral surface of the output shaft.

  The motor unit 16 includes a permanent magnet 16a and a coil 16b. The permanent magnet 16a is fixed to the rotor 12, and the coil 16b is fixed to the outer wall body 22b of the stator 22. The permanent magnet 16a and the coil 16b are arranged facing each other in the axial direction with a predetermined interval. Further, the permanent magnet 16a is disposed with a predetermined offset in the axially downward direction so that the resolver 30, the deep groove ball bearing 14 and the coil 16b are located on the same radial plane when the coil 16b is excited.

  The resolver 30 is composed of a resolver rotor 18 made of a hollow annular stratified iron core, and an annular stratified iron core that is disposed facing the resolver rotor 18 at a predetermined interval, and in which a plurality of stator poles are formed at equal intervals in the circumferential direction. It is an outer rotor type resolver configured to have a resolver stator 20. In FIG. 1, one resolver 30 (upward in the axial direction) has an annular resolver rotor 18 having an inner periphery that is eccentric with respect to the axis of the deep groove ball bearing 14, and the reluctance per one rotation of the resolver rotor 18. This is an ABS (Absolute) type unipolar resolver that outputs a unipolar resolver signal in which the fundamental component of the change is one cycle. The other resolver 30 (downward in the axial direction) has a resolver rotor 18 in which a plurality of salient pole-shaped teeth are formed at equal intervals in the circumferential direction, and the fundamental wave component of the reluctance change per rotation of the resolver rotor 18. This is an INC (Increment) type multi-pole resolver that outputs a multi-pole multi-pole resolver signal.

  The resolver rotors 18 of the two resolvers 30 are arranged at a minute interval via a rotor spacer 42 and are attached to the outer peripheral surface of the inner wall body 12a of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 of the two resolvers 30 is disposed with a small gap through a stator spacer 44 and is attached to the inner peripheral surface of the inner ring retainer 26 by bolts 20a. It is fixed to the inner peripheral surface side of the body 22a.

Then, when the coil 16b is energized, the rotor 12 and the resolver rotor 18 rotate integrally, the reactance change is detected by the resolver stator 20, and the rotational speed and positioning are controlled by a controller (not shown). ing.
Next, the operation of the present embodiment will be described.
When the coil 16b is energized, the permanent magnet 16a and the coil 16b are disposed so as to face each other in the axial direction. Therefore, the permanent magnet 16a and the coil 16b are moved in the axial direction by the magnetic attractive force generated between the permanent magnet 16a and the coil 16b. Along with this suction, an axial preload is applied to the deep groove ball bearing 14. Also, the axial gap is corrected. Next, a rotational torque is applied to the rotor 12, and the rotor 12 rotates in a state where a preload is applied. Then, the resolver 30 detects a change in reluctance between the resolver rotor 18 and the resolver rotor 18 that rotates integrally with the rotor 12, and the controller (not shown) controls the rotational speed and positioning.

  When a moment load is applied to the thin motor 100, the thin motor 100 tilts about the deep groove ball bearing 14, but the resolver 30 is disposed on the same plane in the radial direction as the deep groove ball bearing 14, so that the gap change of the resolver 30 is changed. Can be small. In particular, since the permanent magnet 16a and the coil 16b are arranged with a predetermined offset, the resolver 30, the deep groove ball bearing 14 and the coil 16b are located on the same radial plane when the coil 16b is excited, and the gap changes during rotation. Can be reduced.

Moreover, since the resolver 30, the deep groove ball bearing 14, and the motor part 16 are arrange | positioned on the radial direction same plane, the height (length of an axial direction) of the thin motor 100 can be made small.
Furthermore, since the resolver 30 is disposed on the opposite side of the motor unit 16 with the deep groove ball bearing 14 interposed therebetween, the resolver 30 is not easily affected by noise and heat from the motor unit 16.
Furthermore, when a method such as increasing the preload of the deep groove ball bearing 14 is adopted, the gap change can be suppressed, but the life of the deep groove ball bearing 14 is shortened. In the present invention, the gap change is small. Since the change in the gap is reduced by arranging the resolver 30 at the position, the life of the deep groove ball bearing 14 can be extended.

  Thus, in the present embodiment, the deep groove ball bearing 14 having the inner ring 14a and the outer ring 14b, the stator 22 supported by the inner ring 14a, the rotor 12 supported by the outer ring 14b, and the rotor 12 with rotational torque. The motor unit 16 to be applied and the resolver 30 for detecting the rotational angle position of the rotor 12 are provided. The resolver 30, the deep groove ball bearing 14 and the motor unit 16 are arranged on the same radial plane, and the permanent magnet 16a and the coil 16b. Are arranged opposite to each other in the axial direction with a predetermined interval.

  As a result, even when a moment load is applied to the thin motor 100, the resolver 30 is disposed at a position where the gap change is small. Therefore, the change in the gap of the resolver 30 can be reduced as compared with the conventional case. The possibility of erroneous detection can be reduced. Moreover, since the resolver 30, the deep groove ball bearing 14, and the motor part 16 are arrange | positioned on the radial direction same plane, the height of the thin motor 100 can be made small. Furthermore, the life of the deep groove ball bearing 14 can be extended as compared with a method such as increasing the preload of the deep groove ball bearing 14. Further, since the deep groove ball bearing 14 is preloaded during rotation due to the axially opposed arrangement of the permanent magnet 16a and the coil 16b, it can receive loads from a plurality of directions, as compared with the case where a combination bearing is used. The number of parts can be reduced and the reliability can be improved.

Further, in the present embodiment, the permanent magnet 16a is disposed with a predetermined offset in the axially lower direction so that the resolver 30, the deep groove ball bearing 14 and the coil 16b are positioned on the same radial plane when the coil 16b is excited. Has been.
Thereby, the gap change at the time of rotation can be made small.
Further, in the present embodiment, the resolver 30, the deep groove ball bearing 14 and the motor unit 16 are arranged on the same plane in the radial direction in that order from the radial inner side.

Thereby, since the resolver 30 is arrange | positioned on the opposite side of the motor part 16 on both sides of the deep groove ball bearing 14, the resolver 30 is hard to be influenced by the noise and heat from the motor part 16, and implement | achieves high detection accuracy. Can do.
Furthermore, in the present embodiment, the resolver 30 is disposed to face the annular resolver rotor 18 having an inner periphery that is eccentric with respect to the axis of the deep groove ball bearing 14, and the resolver rotor 18 with a predetermined interval. A resolver stator 20 that detects a change in reluctance with the resolver rotor 18 is provided.

Thus, in the resolver 30 of the type in which the fundamental wave component of the reluctance change per rotation is one period, the influence of the gap change due to the moment load is large, and thus the reduction of the gap change is effective in preventing erroneous detection.
In the above embodiment, the deep groove ball bearing 14 corresponds to the rolling bearing of inventions 1 to 5, the stator 22 corresponds to the inner ring supported body of the invention 1, 4 or 5, and the rotor 12 corresponds to inventions 1, 4 and 5. Alternatively, the resolver 30 corresponds to the rotation sensor of the first to fifth aspects. The resolver rotor 18 corresponds to the detection object of the invention 4 or 5, the resolver stator 20 corresponds to the detection means of the invention 4 or 5, and the motor unit 16 corresponds to the drive body of the invention 1 to 5. ing.

In the above embodiment, the resolver 30, the deep groove ball bearing 14 and the motor unit 16 are arranged on the same plane in the radial direction in the order from the radial inner side. However, the present invention is not limited to this, and the resolver 30 and the deep groove ball bearing are arranged. 14 and the motor unit 16 can be arranged in any order. For example, the following five configurations can be adopted.
First, the first configuration will be described.

FIG. 2 is a cross-sectional view in the axial direction of a thin motor 100 in which the motor unit 16, the deep groove ball bearing 14 and the resolver 30 are arranged in the same order in the radial direction from the radial inner side.
As shown in FIG. 2, the motor unit 16, the deep groove ball bearing 14, and the resolver 30 are arranged on the same plane in the radial direction in that order from the radially inner side.
An annular inner wall body 22a protruding upward in the axial direction (upward direction in FIG. 2) is formed on the stator 22, and an annular outer wall body protruding upward in the axial direction is formed radially outward from the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall 12a projecting downward in the axial direction (downward in FIG. 2), and the annular wall projecting downward in the axial direction is formed radially outward from the inner wall 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the inner wall body 12 a of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the inner wall body 12a of the rotor 12 is brought into contact with the upper surface of the inner ring 14a, the pressing portion 26b of the inner ring presser 26 is brought into contact with the lower surface of the inner ring 14a, and the inner ring presser 26 is connected to the inner wall of the rotor 12 with a bolt 26a. It is fixed by fastening to the body 12a.
The outer ring 14 b is fixed to the outer wall body 22 b of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the outer wall body 22b of the stator 22 is brought into contact with the lower surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the upper surface of the outer ring 14b, and the outer ring presser 28 is fixed to the outer wall of the stator 22 with bolts 28a. It is fixed by fastening to the body 22b.

  The permanent magnet 16a is fixed to the rotor 12, and the coil 16b is fixed to the inner wall 22a of the stator 22. The permanent magnet 16a and the coil 16b are arranged to face each other in the axial direction with a predetermined interval. Further, the permanent magnet 16a is disposed with a predetermined offset in the axially downward direction so that the resolver 30, the deep groove ball bearing 14 and the coil 16b are located on the same radial plane when the coil 16b is excited.

  The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal. The resolver 30 has the same function as the resolver 30 in the above embodiment except that it is configured integrally. Have. The resolver rotor 18 is attached to the outer wall 12b of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 is attached to the outer peripheral surface of the outer ring retainer 28 by bolts 20 a, and is fixed to the outer peripheral surface side of the outer wall body 22 b of the stator 22 together with the outer ring retainer 28.

In this manner, in the first configuration, the motor unit 16, the deep groove ball bearing 14 and the resolver 30 are arranged in the same order in the radial direction from the radial inner side.
Thereby, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the deep groove ball bearing 14, the resolver 30 is disposed on the opposite side of the motor unit 16 with the deep groove ball bearing 14 interposed therebetween. Therefore, the resolver 30 is hardly affected by noise and heat from the motor unit 16, and high detection accuracy can be realized. In addition, since the resolver 30 is arranged on the outermost side in the radial direction, the diameter of the resolver 30 can be increased, so that the accuracy during mold processing can be stabilized and higher detection accuracy can be realized. .

Next, the second configuration will be described.
FIG. 3 is a cross-sectional view in the axial direction of a thin motor 100 in which the deep groove ball bearing 14, the motor unit 16, and the resolver 30 are arranged in the same order in the radial direction from the radially inner side.
As shown in FIG. 3, the deep groove ball bearing 14, the motor unit 16, and the resolver 30 are arranged on the same plane in the radial direction in that order from the radially inner side.

  An annular inner wall body 22a protruding upward in the axial direction (upward in FIG. 3) is formed on the stator 22, and an annular outer wall body protruding upward in the axial direction is formed radially outward from the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall 12a protruding downward in the axial direction (downward in FIG. 3), and an annular inner wall 12a protruding downward in the axial direction is formed radially outward from the inner wall 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the inner wall body 22 a of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the inner wall body 22a of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring presser 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring presser 26 is connected to the inner wall of the stator 22 with a bolt 26a. It is fixed by fastening to the body 22a.
The outer ring 14 b is fixed to the inner wall body 12 a of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the inner wall body 12a of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the inner wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12a.

  The permanent magnet 16a is fixed to the rotor 12, and the coil 16b is fixed to the outer wall body 22b of the stator 22. The permanent magnet 16a and the coil 16b are arranged facing each other in the axial direction with a predetermined interval. Further, the permanent magnet 16a is disposed with a predetermined offset in the axially downward direction so that the resolver 30, the deep groove ball bearing 14 and the coil 16b are located on the same radial plane when the coil 16b is excited.

  The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal. The resolver 30 has the same function as the resolver 30 in the above embodiment except that it is configured integrally. Have. The resolver rotor 18 is attached to the outer wall 12b of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 is attached to the outer peripheral surface of the outer wall body 22b of the stator 22 by a bolt 20a.

In this way, in the second configuration, the deep groove ball bearing 14, the motor unit 16, and the resolver 30 are arranged in the same order in the radial direction from the radial inner side.
Thereby, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the deep groove ball bearing 14, the resolver 30 is disposed on the outermost side in the radial direction, thereby increasing the diameter of the resolver 30. Therefore, it is possible to stabilize the accuracy at the time of mold processing and realize higher detection accuracy. Further, since the deep groove ball bearing 14 is disposed on the innermost side in the radial direction, the height of the thin motor 100 can be reduced by reducing the size of the deep groove ball bearing 14, and the motor unit 16 or the resolver 30. Wiring is easy, and the grease in the deep groove ball bearing 14 is difficult to leak.

Next, a third configuration will be described.
FIG. 4 is an axial sectional view of the thin motor 100 in which the deep groove ball bearing 14, the resolver 30, and the motor unit 16 are arranged on the same plane in the radial direction in that order from the radial inner side.
As shown in FIG. 4, the deep groove ball bearing 14, the resolver 30, and the motor unit 16 are arranged on the same plane in the radial direction in that order from the radially inner side.

  The stator 22 is formed with an annular inner wall body 22a protruding upward in the axial direction (upward in FIG. 4), and an annular outer wall body protruding upward in the axial direction on the radially outer side of the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall 12a projecting downward in the axial direction (downward in FIG. 4), and the annular wall projecting downward in the axial direction is formed radially outward from the inner wall 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the inner wall body 22 a of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the inner wall body 22a of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring presser 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring presser 26 is connected to the inner wall of the stator 22 with a bolt 26a. It is fixed by fastening to the body 22a.
The outer ring 14 b is fixed to the inner wall body 12 a of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the inner wall body 12a of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the inner wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12a.

  The permanent magnet 16a is fixed to the rotor 12, and the coil 16b is fixed to the outer wall body 22b of the stator 22. The permanent magnet 16a and the coil 16b are arranged facing each other in the axial direction with a predetermined interval. Further, the permanent magnet 16a is disposed with a predetermined offset in the axially downward direction so that the resolver 30, the deep groove ball bearing 14 and the coil 16b are located on the same radial plane when the coil 16b is excited.

  The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal. The resolver 30 has the same function as the resolver 30 in the above embodiment except that it is configured integrally. Have. The resolver rotor 18 is attached to the outer peripheral surface of the outer ring retainer 28 by bolts 18 a, and is fixed to the outer peripheral surface side of the inner wall body 12 a of the rotor 12 together with the outer ring retainer 28. On the other hand, the resolver stator 20 is attached to the inner peripheral surface of the outer wall body 22b of the stator 22 by a bolt 20a.

In this way, in the third configuration, the deep groove ball bearing 14, the resolver 30, and the motor unit 16 are arranged on the same plane in the radial direction in that order from the radial inner side.
Thereby, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the deep groove ball bearing 14, the deep groove ball bearing 14 is disposed on the innermost side in the radial direction. By reducing the size of 14, the height of the thin motor 100 can be reduced, wiring to the motor unit 16 or the resolver 30 is easy, and the grease of the deep groove ball bearing 14 is difficult to leak. Moreover, since the motor part 16 is arrange | positioned on the outermost side of radial direction, the space which winds a coil | winding can be ensured large and a high output torque can be implement | achieved. Furthermore, the number of poles of the motor unit 16 can be increased, and operation from low speed to ultra-low speed can be realized.

Next, a fourth configuration will be described.
FIG. 5 is an axial cross-sectional view of a thin motor 100 in which the motor unit 16, the resolver 30 and the deep groove ball bearing 14 are arranged on the same plane in the radial direction in that order from the radial inner side.
As shown in FIG. 5, the motor unit 16, the resolver 30, and the deep groove ball bearing 14 are arranged on the same radial plane in that order from the radial inner side.

  The stator 22 is formed with an annular inner wall body 22a protruding upward in the axial direction (upward in FIG. 5), and an annular outer wall body protruding upward in the axial direction on the radially outer side of the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall 12a protruding downward in the axial direction (downward in FIG. 5), and an annular inner wall 12a protruding downward in the axial direction is formed radially outward from the inner wall 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the outer wall body 22 b of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the outer wall body 22b of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring retainer 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring retainer 26 is secured to the outer wall of the stator 22 with bolts 26a. It is fixed by fastening to the body 22b.
The outer ring 14b is fixed to the outer wall body 12b of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the outer wall body 12b of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the outer wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12b.

  The permanent magnet 16a is fixed to the rotor 12, and the coil 16b is fixed to the inner wall 22a of the stator 22. The permanent magnet 16a and the coil 16b are arranged to face each other in the axial direction with a predetermined interval. Further, the permanent magnet 16a is disposed with a predetermined offset in the axially downward direction so that the resolver 30, the deep groove ball bearing 14 and the coil 16b are located on the same radial plane when the coil 16b is excited.

  The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal. The resolver 30 has the same function as the resolver 30 in the above embodiment except that it is configured integrally. Have. The resolver rotor 18 is attached to the outer peripheral surface of the inner wall body 12a of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 is attached to the inner peripheral surface of the inner ring retainer 26 by bolts 20 a and is fixed to the inner peripheral surface side of the outer wall body 22 b of the stator 22 together with the inner ring retainer 26.

Thus, in the fourth configuration, the motor unit 16, the resolver 30, and the deep groove ball bearing 14 are arranged on the same plane in the radial direction in that order from the radial inner side.
As a result, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the deep groove ball bearing 14, the deep groove ball bearing 14 is disposed on the outermost side in the radial direction. The deep groove ball bearing 14 can be accommodated, and high rigidity can be realized.

Next, a fifth configuration will be described.
FIG. 6 is a sectional view in the axial direction of a thin motor 100 in which the resolver 30, the motor unit 16, and the deep groove ball bearing 14 are arranged on the same plane in the radial direction in that order from the radial inner side.
As shown in FIG. 6, the resolver 30, the motor unit 16, and the deep groove ball bearing 14 are arranged on the same radial plane in that order from the radial inner side.

  An annular inner wall body 22a protruding upward in the axial direction (upward direction in FIG. 6) is formed on the stator 22, and an annular outer wall body protruding upward in the axial direction is formed radially outward from the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall body 12a protruding downward in the axial direction (downward in FIG. 6), and the annular wall protruding downward in the axial direction is formed radially outward from the inner wall body 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the outer wall body 22 b of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the outer wall body 22b of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring retainer 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring retainer 26 is secured to the outer wall of the stator 22 with bolts 26a. It is fixed by fastening to the body 22b.
The outer ring 14b is fixed to the outer wall body 12b of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the outer wall body 12b of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the outer wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12b.

  The permanent magnet 16a is fixed to the rotor 12, and the coil 16b is fixed to the outer wall body 22b of the stator 22. The permanent magnet 16a and the coil 16b are arranged facing each other in the axial direction with a predetermined interval. Further, the permanent magnet 16a is disposed with a predetermined offset in the axially downward direction so that the resolver 30, the deep groove ball bearing 14 and the coil 16b are located on the same radial plane when the coil 16b is excited.

  The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal. The resolver 30 has the same function as the resolver 30 in the above embodiment except that it is configured integrally. Have. The resolver rotor 18 is attached to the inner peripheral surface of the inner wall 12a of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 is attached to the outer peripheral surface of the inner wall 22a of the stator 22 by a bolt 20a.

Thus, in the fifth configuration, the resolver 30, the motor unit 16, and the deep groove ball bearing 14 are arranged on the same plane in the radial direction in that order from the radial inner side.
As a result, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the deep groove ball bearing 14, the deep groove ball bearing 14 is disposed on the outermost side in the radial direction. The deep groove ball bearing 14 can be accommodated, and high rigidity can be realized.

Moreover, in the said embodiment, although comprised with the inner rotor type | mold which the inner side of the thin motor 100 rotates, it can also comprise with the outer rotor type | mold which the outer side of the thin motor 100 rotates. In this case, the rotor 12 becomes an inner ring supported body, and the stator 22 becomes an outer ring supported body.
2 to 6, the outer side of the thin motor 100 is configured as an outer rotor type. However, the configuration is not limited thereto, and the inner side of the thin motor 100 may be configured as an inner rotor type. . In this case, the rotor 12 becomes an inner ring supported body, and the stator 22 becomes an outer ring supported body.

Moreover, in the said embodiment, although the permanent magnet 16a was arrange | positioned with a predetermined offset, it is not restricted to this, You may arrange | position the coil 16b with a predetermined offset, or the permanent magnet 16a and the coil 16b with a predetermined offset. May be arranged. The same applies to the configurations of FIGS.
In the above embodiment, the resolver rotor 18 is attached to the outer peripheral surface of the inner wall 12a of the rotor 12 and the resolver stator 20 is attached to the inner peripheral surface of the inner ring retainer 26. However, the present invention is not limited to this. Can be configured by attaching the resolver rotor 18 to the outer peripheral surface of the inner wall body 12 a of the rotor 12 and the inner peripheral surface of the inner ring presser 26. The same applies to the configurations of FIGS.

  In the above embodiment, the ABS type and INC type resolver 30 are provided. However, the present invention is not limited to this, and an ABS type resolver may be provided, or an INC type resolver may be provided. It can also be configured, or a tape scale for detecting marks formed in the circumferential direction can be provided instead of the resolver. The same applies to the configurations of FIGS.

  Further, in the above embodiment, the inner wall body 22a and the outer wall body 22b of the stator 22 are formed as a part of the stator 22. However, it can also be configured by attaching it to the stator 22. Further, the inner ring retainer 26 can be directly attached to the stator 22 without forming the inner wall body 22a of the stator 22, but in this case, the inner ring retainer 26 constitutes the inner wall body of the stator 22. The same applies to the configurations of FIGS.

  In the above embodiment, the inner wall body 12a and the outer wall body 12b of the rotor 12 are formed as a part of the rotor 12. However, the present invention is not limited to this, and the inner wall body 12a or the outer wall body 12b of the rotor 12 is constituted by separate members. However, it can also be configured by attaching it to the rotor 12. Further, the outer ring retainer 28 can be directly attached to the rotor 12 without forming the outer wall body 12b of the rotor 12, but in this case, the outer ring retainer 28 constitutes the outer wall body of the rotor 12. The same applies to the configurations of FIGS.

  Moreover, in the said embodiment, although the deep groove ball bearing 14 was applied, it is not limited to this, A cross roller bearing, a 4-point contact ball bearing, an angular ball bearing, a cylindrical roller bearing, a tapered roller bearing etc. are applied May be. In this case, it is preferable to employ a rolling bearing that can simultaneously receive a moment load, an axial load, and a radial load. As such a rolling bearing, for example, a cross roller bearing or a four-point contact ball bearing is applicable. The same applies to the configurations of FIGS.

  In the above embodiment, the rolling bearing device having the preload imparting structure by the driving body according to the present invention is applied to the structure that rotatably supports the stator 22 and the rotor 12. The present invention can be applied to any structure as long as it is interposed between members and supports them relatively rotatably. The same applies to the configurations of FIGS.

It is sectional drawing of the axial direction of the thin motor 100 which concerns on this Embodiment. It is sectional drawing of the axial direction of the thin motor 100 which has arrange | positioned the motor part 16, the deep groove ball bearing 14, and the resolver 30 on the same plane of radial direction in the order from radial inside. It is sectional drawing of the axial direction of the thin motor 100 which has arrange | positioned the deep groove ball bearing 14, the motor part 16, and the resolver 30 on the same plane of radial direction in the order from radial inside. It is sectional drawing of the axial direction of the thin motor 100 which has arrange | positioned the deep groove ball bearing 14, the resolver 30, and the motor part 16 on the same plane of radial direction in the order from radial inside. It is sectional drawing of the axial direction of the thin motor 100 which has arrange | positioned the motor part 16, the resolver 30, and the deep groove ball bearing 14 on the same plane of radial direction in the order from radial inside. It is sectional drawing of the axial direction of the thin motor 100 which has arrange | positioned the resolver 30, the motor part 16, and the deep groove ball bearing 14 on the same plane of radial direction in the order from radial inside. It is sectional drawing of the axial direction of the conventional thin motor 200. FIG.

Explanation of symbols

100, 200 Thin motor 12 Rotor 14 Deep groove ball bearing 14a Inner ring 14b Outer ring 14c Rolling element 16 Motor part 16a Permanent magnet 16b Coil 30 Resolver 18 Resolver rotor 20 Resolver stator 42 Rotor spacer 44 Stator spacer 22 Stator 12a, 22a Inner wall 12b , 22b Outer wall body 26 Inner ring presser 28 Outer ring presser 26b, 28b Press part 18a, 20a, 24a, 26a, 28a Bolt 24 Fixing plate 140 Cross roller bearing 140a Inner ring 140b Outer ring 220 Housing inner

Claims (5)

A rolling bearing having an inner ring and an outer ring, an inner ring supported body supported by the inner ring, an outer ring supported body supported by the outer ring, and the inner ring supported body and the outer ring supported body relatively rotate. In a rolling bearing device comprising: a driving body; and a rotation sensor that is arranged between the inner ring supported body and the outer ring supported body and outputs a sensor signal that varies depending on a relative position thereof.
The rotation sensor, the rolling bearing and the driving body are arranged on the same plane in the radial direction,
The driving body is a motor unit having a magnet fixed to one of the inner ring supported body and the outer ring supported body and a coil fixed to the other, and the magnet and the coil face each other in the axial direction. A rolling bearing device having a preload imparting structure with a drive body, wherein In claim 1,
The drive body characterized in that the magnet and the coil are arranged with a predetermined offset so that the rotation sensor, the rolling bearing and the coil are located on the same radial plane when the coil is excited. A rolling bearing device having a preload application structure. In any one of Claim 1 and 2,
A rolling bearing device having a preload-applying structure using a driving body, wherein the rotation sensor, the rolling bearing, and the driving body are arranged on the same plane in the radial direction in that order from the radially inner side. In any one of Claims 1 thru | or 3,
The inner ring supported body and the outer ring supported body respectively have an inner wall body and an outer wall body formed inside and outside in the radial direction, and the inner wall body of the inner ring supported body is an inner wall body and an outer wall body of the outer ring supported body. Between, the outer wall body of the outer ring supported body is disposed straddling each other so as to be located between the inner wall body and the outer wall body of the inner ring supported body,
The detected body of the rotation sensor is fixed to one of the inner wall body of the outer ring supported body and the inner wall body of the inner ring supported body, and the detection means of the rotation sensor is fixed to the other,
Fixing the inner ring to the inner wall of the inner ring supported body, and fixing the outer ring to the outer wall of the outer ring supported body;
A rolling bearing device having a preload imparting structure by a driving body, wherein the magnet is fixed to one of the outer ring supported body and the inner ring supported body, and the coil is fixed to the other. In any one of Claims 1 thru | or 4,
The rotation sensor includes an annular detection object in which one of an inner periphery and an outer periphery is eccentric with respect to the axis of the rolling bearing, and a detection unit that detects a change in reluctance between the detection object. The detected body is set on one of the inner ring supported body and the outer ring supported body, and the detected object is detected on the other side so that the eccentric side of the inner circumference and outer circumference of the detected body faces the detecting means. A rolling bearing device having a preload applying structure by a driving body, characterized in that means is provided.

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