JP2008215508A - Rolling bearing device with unit attachment structure of rotation sensor and rolling bearing device with unit attachment structure of 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 cross roller 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, cross roller bearing 14 and motor part 16 are arranged on a same radial plane from a radial inner side in this order, and a coil 16b and a resolver stator 20 are constituted as an attachable and detachable unit. <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 rotation sensor unit mounting structure suitable for preventing erroneous detection of the rotation sensor when a moment load is applied. The present invention also relates to a rolling bearing device having a unit mounting structure for a driving body.

Conventionally, as a thin motor, a thin motor including a rolling bearing and a rotation sensor is known.
FIG. 2 is a cross-sectional view of the conventional thin motor 200 in the axial direction.
As shown in FIG. 2, 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 14.

  The cross roller bearing 14 has an inner ring 14a and an outer ring 14b. The inner ring 14a 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 14 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 so as to be opposed to the resolver rotor 18 at a predetermined interval with an annular resolver rotor 18 having an inner periphery that is eccentric with respect to the axis of the cross roller bearing 14, 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 14a and the outer ring 14b 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 14 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 14, the gap change increases as the distance from the cross roller bearing 14 increases. Moreover, since it is a thin motor, it must receive a moment load with one cross roller bearing 14, and it is difficult to increase the number of cross roller bearings 14 to increase rigidity and prevent a gap change.

  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. It is an object of the present invention to provide a rolling bearing device having a sensor unit mounting structure and a rolling bearing device having a drive unit mounting structure.

  [Invention 1] In order to achieve the above object, a rolling bearing device having a unit mounting structure for a rotation sensor 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, In a rolling bearing device comprising: an outer ring supported body supported by an outer ring; 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 the relative position thereof. The rotation sensor and the rolling bearing are arranged on the same radial plane, and the rotation sensor is configured as a unit that can be attached and detached.

With such a configuration, the inner ring supported body and the outer ring supported body are relatively rotatably supported by the rolling bearing. 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.

Further, since the rotation sensor and the rolling bearing are arranged on the same radial plane, 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.

Furthermore, since the rotation sensor is configured as a unit that can be attached and removed, attachment and replacement are facilitated, and maintenance is improved.
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. Hereinafter, the same applies to the rolling bearing device having the unit mounting structure of the rotation sensor of the invention 2 and the rolling bearing device having the unit mounting structure of the driving body of the invention 6.

  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. Hereinafter, the same applies to the rolling bearing device having the unit mounting structure of the rotation sensor of the invention 2 and the rolling bearing device having the unit mounting structure of the driving body of the invention 6.

  [Invention 2] Further, the rolling bearing device having the unit mounting structure of the rotation sensor according to Invention 2 includes a rolling bearing having an inner ring and an outer ring, an inner ring supported body supported by the inner ring, and an outer ring supported by the outer ring. A supported body, a driving body that relatively rotates the inner ring supported body and the outer ring supported body, and a space between the inner ring supported body and the outer ring supported body, and changes depending on their relative positions. In a rolling bearing device comprising a rotation sensor that outputs a sensor signal, the rotation sensor, the rolling bearing, and the drive body are arranged on the same radial plane in the order from the radial inner side, and the rotation sensor and the drive The body was configured as a unit that could be attached and removed.

With such a configuration, the inner ring supported body and the outer ring supported body are relatively rotatably supported by the rolling bearing. 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, since the rotation sensor is arranged on the opposite side of the driving body with the rolling bearing interposed therebetween, the rotation sensor is hardly affected by noise and heat from the driving body.
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.

Furthermore, since the rotation sensor and the drive body are configured as a unit that can be attached and removed, attachment and replacement are facilitated, and maintenance is improved.
Here, for example, an actuator such as a motor or an engine corresponds to the driving body. Hereinafter, the same applies to the rolling bearing device having the unit mounting structure of the driving body of the sixth aspect.

  [Invention 3] Further, the rolling bearing device having the rotation sensor unit mounting structure of Invention 3 is the rolling bearing device having the rotation sensor unit mounting structure of Invention 2, wherein the inner ring supported body and the outer ring supported body are: Each having an inner wall body and an outer wall body formed inside and outside in the radial direction, wherein the inner wall body of the inner ring supported body is between the inner wall body and the outer wall body of the outer ring supported body. Are disposed so as to be positioned between the inner wall body and the outer wall body of the inner ring supported body, and the inner ring supported body is disposed below the outer ring supported body in the axial direction. A detection body of the rotation sensor is fixed to one of an inner wall body of the body and an inner wall body of the inner ring supported body, and a detection means of the rotation sensor is fixed to the other side so as to be attachable and removable, and the inner ring supported body In front of the inner wall An inner ring, the outer ring is fixed to an outer wall body of the outer ring supported body, a rotor of the driving body is fixed to one of the outer wall body of the outer ring supported body and the outer wall body of the inner ring supported body, and the other The stator of the driving body was fixed to be attachable and detachable.

  With such a configuration, when the rotor of the driving body is fixed to the outer wall body of the outer ring supported body, the outer ring supported body and the outer ring rotate, and the outer wall body of the inner ring supported body rotates to the outer wall body of the driving body. When the rotor is fixed, the inner ring supported body and the inner ring rotate. 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.

Further, since the driving body can be attached from the upper side in the axial direction and removed from the upper side in the axial direction, the mounting and replacement of the driving body can be facilitated.
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 4] Further, the rolling bearing device having the rotation sensor unit mounting structure of Invention 4 is the rolling bearing device having the rotation sensor unit mounting structure of any one of Inventions 1 to 3, wherein the rolling bearing is a cross It is a roller bearing or a four-point contact ball bearing.
With such a configuration, moment load, axial load and radial load can be simultaneously received.

  [Invention 5] Further, the rolling bearing device having the rotation sensor unit mounting structure according to Invention 5 is the rolling bearing device having the rotation sensor unit mounting structure according to any one of Inventions 1 to 4, wherein the rotation sensor includes an inner portion. 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.

  [Invention 6] On the other hand, in order to achieve the above object, a rolling bearing device having a unit mounting structure for a drive body of Invention 6 includes a rolling bearing having an inner ring and an outer ring, an inner ring supported body supported by the inner ring, and An outer ring supported body supported by the outer ring, a driving body for relatively rotating the inner ring supported body and the outer ring supported body, and an inner ring supported body and the outer ring supported body. And a rotation sensor that outputs a sensor signal that changes depending on their relative position, wherein the rotation sensor, the rolling bearing, and the drive body are arranged on the same radial plane, and the drive body is mounted. And configured as a removable unit.

With such a configuration, the inner ring supported body and the outer ring supported body are relatively rotatably supported by the rolling bearing. 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.

  Furthermore, since the drive body is configured as a unit that can be attached and detached, attachment and replacement are facilitated, and maintenance is improved.

  As described above, according to the rolling bearing device having the rotation sensor unit mounting structure of the invention 1, even if a moment load is applied to the rolling bearing device, the rotation sensor is disposed 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. Further, since the rotation sensor and the rolling bearing 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 rotation sensor is configured as a unit that can be attached and detached, it is easy to attach and replace, and the effect that the maintainability can be improved is also obtained.

  Further, according to the rolling bearing device having the rotation sensor unit mounting structure of the invention 2, 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. Thus, 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. In addition, since the rotation sensor is arranged on the opposite side of the drive body with the rolling bearing interposed therebetween, the rotation sensor is hardly affected by noise and heat from the drive body, and an effect that high detection accuracy can be realized. can get. 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 rotation sensor and the drive body are configured as a unit that can be attached and removed, the attachment and replacement can be facilitated, and the effect that the maintainability can be improved is also obtained.

Furthermore, according to the rolling bearing device having the unit mounting structure of the rotation sensor of the invention 3, the driving body can be mounted from the upper side in the axial direction and can be removed from the upper side in the axial direction. The effect of becoming is obtained.
Further, according to the rolling bearing device having the rotation sensor unit mounting structure of the invention 4, since moment load, axial load and radial load can be simultaneously received, moment load is maintained while maintaining rigidity against the axial load and radial load. The effect that the gap change by this can be reduced is obtained.

  On the other hand, according to the rolling bearing device having the unit mounting structure of the driving body of the invention 6, 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. Thus, 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 drive body is configured as a unit that can be attached and detached, it is easy to attach and replace, and the effect that the maintainability can be improved 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 unit mounting structure for a rotation sensor according to the present invention and a rolling bearing device having a unit mounting structure for a driving body.
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 cross roller bearing that is interposed between the rotor 12 and the stator 22 to rotatably support 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 cross roller 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 cross roller bearing 14 includes an inner ring 14a, an outer ring 14b, and a plurality of cross rollers (rollers) 14c provided so as to be able to roll between the inner ring 14a and the outer ring 14b. The cross roller 14c has a substantially cylindrical shape whose diameter is slightly larger than the length, and the even-numbered rotation shaft on the track and the odd-numbered rotation shaft on the track are inclined by 90 °.
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 disposed to face the permanent magnet 16a with a predetermined interval. The permanent magnet 16 a is attached to the outer peripheral surface of the outer ring retainer 28, and is fixed to the outer peripheral surface of the outer wall body 12 b of the rotor 12 together with the outer ring retainer 28. On the other hand, the coil 16b is configured as an attachable / detachable unit, and is fixed to the outer wall body 22b of the stator 22 by a bolt 16c so as to be attachable / detachable. Therefore, the coil 16b can be attached from the upper side in the axial direction and removed from the upper side in the axial direction. Since there is no obstacle in the axial direction above the location where the coil 16b is attached, it is easy to attach or replace the coil 16b.

The resolver 30 is an outer rotor type ABS (Absolute) / INC (Increment) integrated resolver having a resolver rotor 18 made of a hollow annular stratified iron core and a resolver stator 20 made of an annular stratified iron core. It is.
The resolver rotor 18 has a plurality of salient pole-like teeth formed at equal intervals in the circumferential direction, and the inner circumference thereof is eccentric with respect to the axis of the cross roller bearing 14. In the resolver stator 20, a plurality of stator poles are formed at equal intervals along the circumferential direction of the annular stator base. Each stator pole has a single pole detection winding for outputting a single pole resolver signal for detecting the absolute angular position of the resolver rotor 18 and a multipole resolver signal for detecting the relative angular position of the resolver rotor 18. The output winding for multipolar detection is wound. As a result, the resolver 30 outputs a unipolar resolver signal in which the fundamental wave component of the reluctance change becomes one cycle and a multipolar resolver signal in which the fundamental wave component of the reluctance change becomes multi-cycle for each rotation of the resolver rotor 18. .

  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 configured as a unit that can be attached and removed, and is fixed to the inner peripheral surface of the inner ring retainer 26 by a bolt 20 a so as to be attachable and detachable. It is being fixed to the inner peripheral surface side. Therefore, the resolver stator 20 can be attached from the lower side in the axial direction and removed from the lower side in the axial direction.

The thin motor 100 has a structure in which the controller (not shown) controls the rotation speed and positioning based on the monopolar resolver signal and the multipolar resolver signal detected by the resolver 30.
Next, the operation of the present embodiment will be described.
When the coil 16b is energized, rotational torque is applied to the rotor 12, and the rotor 12 rotates. 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 is tilted about the cross roller bearing 14, but the resolver 30 is arranged on the same plane in the radial direction as the cross roller bearing 14, so that the gap change of the resolver 30 is changed. Can be small.
Moreover, since the resolver 30, the cross roller 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 cross roller bearing 14 interposed therebetween, the resolver 30 is not easily affected by noise or heat from the motor unit 16.
Furthermore, when a method such as increasing the preload of the cross roller bearing 14 is adopted, the gap change can be suppressed, but on the other hand, the life of the cross roller 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 cross roller bearing 14 can be extended.

Furthermore, since the coil 16b and the resolver stator 20 are constructed as a unit that can be attached and removed, attachment and replacement are facilitated, and maintenance is improved.
In this way, in the present embodiment, the cross roller 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 are provided 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 cross roller bearing 14 and the motor unit 16 are arranged on the same radial plane, and the coil 16 b and the resolver stator 20. Was constructed as a unit that can be mounted and removed.

  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 cross roller 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 cross roller bearing 14 can be extended as compared with a method of increasing the preload of the cross roller bearing 14. Furthermore, since the coil 16b and the resolver stator 20 are configured as a unit that can be attached and detached, attachment and replacement are facilitated, and maintenance can be improved.

Further, in the present embodiment, the resolver 30, the cross roller 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 cross roller bearing 14, the resolver 30 is hard to receive the influence from the noise and heat from the motor part 16, and implement | achieves high detection accuracy. Can do.

Further, in the present embodiment, the stator 22 is disposed below the rotor 12 in the axial direction, and the motor unit 16 is fixed between the outer wall body 22b of the stator 22 and the outer wall body 12b of the rotor 12 so as to be attachable and detachable.
As a result, the coil 16b can be attached and removed from the upper side in the axial direction without being affected by an obstacle, so that the coil 16b can be easily attached or replaced.

Further, in the present embodiment, the cross roller bearing 14 is employed.
As a result, the moment load, the axial load and the radial load can be simultaneously received, so that the gap change due to the moment load can be reduced while maintaining the rigidity against the axial load and the radial load.
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 cross roller bearing 14, and the resolver rotor 18 at 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 cross roller bearing 14 corresponds to the rolling bearing of the inventions 1 to 6, the stator 22 corresponds to the inner ring supported body of the inventions 1 to 3, 5, or 6, and the rotor 12 corresponds to the invention 1. The resolver 30 corresponds to the rotation sensor of the first to sixth aspects of the invention. The resolver rotor 18 corresponds to the detection object of the invention 3 or 5, the resolver stator 20 corresponds to the detection means of the invention 3 or 5, and the motor unit 16 corresponds to the drive body of the invention 2, 3 or 6. Correspondingly, the permanent magnet 16a corresponds to the rotor of the invention 3.

Moreover, in the said embodiment, the coil 16b respond | corresponds to the stator of the invention 3.
In the above embodiment, the coil 16b is configured as a unit that can be attached and removed. However, the present invention is not limited to this, and the permanent magnet 16a can be configured as a unit that can be attached and removed, or both. Can also be configured as a unit that can be attached and removed.

In the above embodiment, the resolver stator 20 is configured as a unit that can be attached and removed. However, the present invention is not limited to this, and the resolver rotor 18 may be configured as a unit that can be attached and removed. Both can be configured as units that can be attached and removed.
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.

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.
In the above embodiment, the ABS / INC integrated resolver 30 is 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.

  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, the present invention is not limited to this, and the inner wall body 22a or the outer wall body 22b of the stator 22 is constituted by separate members. 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.

  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.

In the above embodiment, the resolver 30, the cross roller bearing 14 and the motor unit 16 are arranged on the same plane in the radial direction. However, the present invention is not limited to this, and the motor unit 16 includes the resolver 30 and the cross roller bearing 14. It does not have to be arranged on the same radial plane.
Moreover, in the said embodiment, although the cross roller bearing 14 was applied, it is not limited to this, A 4-point contact ball bearing, an angular contact ball bearing, a deep groove 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. An example of such a rolling bearing is a four-point contact ball bearing.

  Moreover, in the said embodiment, the structure which supports the stator 22 and the rotor 12 rotatably with the rolling bearing apparatus which has the unit attachment structure of the rotation sensor which concerns on this invention, and the rolling bearing apparatus which has the unit attachment structure of a drive body. However, the present invention is not limited to this, and the present invention can be applied to any structure as long as it is interposed between two members and supports them relatively rotatably.

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 conventional thin motor 200. FIG.

Explanation of symbols

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

Claims (6)

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; In a rolling bearing device comprising a rotation sensor that outputs a sensor signal that changes according to their relative position,
The rotation sensor and the rolling bearing are arranged on the same plane in the radial direction,
A rolling bearing device having a unit mounting structure for a rotation sensor, wherein the rotation sensor is configured as a unit that can be mounted and removed. 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 in the order from the radial inner side,
A rolling bearing device having a unit mounting structure for a rotation sensor, wherein the rotation sensor and the driving body are configured as a unit that can be mounted and removed. In claim 2,
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 inner ring supported body and the outer ring supported body so that the outer wall body of the outer ring supported body is positioned between the inner wall body and the outer wall body of the inner ring supported body. Is arranged below the axial direction of
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 to be attachable and detachable.
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;
The rotor of the driving body is fixed to one of the outer wall body of the outer ring supported body and the outer wall body of the inner ring supported body, and the stator of the driving body is fixed to the other side so as to be attachable and removable. A rolling bearing device having a unit mounting structure for a rotation sensor. In any one of Claims 1 thru | or 3,
The rolling bearing device having a rotation sensor unit mounting structure, wherein the rolling bearing is a cross roller bearing or a four-point contact ball bearing. 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 unit mounting structure for a rotation sensor, characterized in that means is provided. 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,
A rolling bearing device having a unit mounting structure for a driving body, wherein the driving body is configured as a unit that can be attached and detached.

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