JP2008253123A - Rolling bearing device having diameter direction plane arrangement structure of rotary sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device suitable for preventing erroneous detection of a rotary sensor when a moment load is applied. <P>SOLUTION: A thin motor 100 includes a cross-roller bearing 14 having an internal wheel 14a and an external wheel 14b; a stator 22 supported by the internal wheel 14a; a rotor 12 supported by the external wheel 14b; a motor unit 16 for providing a rotary torque to the rotor 12; and a resolver 30 for detecting the rotary angle position of the rotor 12. In the motor 100, the cross-roller bearing 14, the motor unit 16 and the resolver 30 are disposed on the same plane in a diameter direction in this order from the inside of the diameter direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing device including a rolling bearing and a rotation sensor, and in particular, a rolling sensor having a radial planar arrangement structure of a rotation sensor suitable for preventing erroneous detection of the rotation sensor when a moment load is applied. The present invention relates to a bearing device.

Conventionally, as a thin motor, a thin motor including a rolling bearing and a rotation sensor is known.
FIG. 5 is a sectional view in the axial direction of a conventional thin motor 200.
As shown in FIG. 5, 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 so as 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 circumference 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 position detector 20 for detecting a change. The resolver rotor 18 is integrally attached to the inner peripheral surface of the rotor 12, and the position detector 20 is integrally attached to the outer peripheral surface of the housing inner 220. By resolving the resolver rotor 18 eccentrically and changing the distance between the resolver rotor 18 and the position detector 20 in the circumferential direction, the reluctance changes according to 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 aims at providing the rolling bearing apparatus which has a radial direction plane arrangement structure of a sensor.

  [Invention 1] In order to achieve the above object, a rolling bearing device having a radial planar arrangement structure of a rotation sensor of Invention 1 includes a rolling bearing having an inner ring and an outer ring, and an inner ring supported body supported by the inner ring. 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 rolling bearing, the driving body, and the rotation sensor are arranged on the same radial plane in this order from the radial inner side. did.

With such a configuration, the inner ring supported body and the outer ring supported body are relatively rotatably supported by the rolling bearing.
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 rolling bearing, the driving body, and the rotation sensor are arranged on the same plane in the radial direction, the height (the length in the axial direction) 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 arranged on the outermost side in the radial direction, the diameter of the rotation sensor can be increased. Therefore, for example, when a rotation sensor in which a plurality of teeth are formed on the detection object is employed, the tooth shape can be increased even with the same number of teeth.
Furthermore, the rolling bearing has a larger cross-sectional dimension as the shaft diameter increases. Therefore, if the size of the rolling bearing can be reduced, the cross-sectional dimension can be reduced. And since the rolling bearing is arrange | positioned at the innermost side of radial direction, if the cross-sectional dimension of a rolling bearing can be made small, the height of a rolling bearing apparatus can be made small.

Furthermore, since the rolling bearing is arranged at the innermost side in the radial direction, wiring to the driving body or the rotation sensor is easy, and the grease of the rolling bearing is difficult to leak.
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.
Moreover, as a drive body, actuators, such as a motor and an engine, correspond, for example.

  [Invention 2] Furthermore, the rolling bearing device having the radial plane arrangement structure of the rotation sensor of the invention 2 is the rolling bearing device having the radial plane arrangement structure of the rotation sensor of the invention 1, in the inner ring supported body and the outer ring. The supported body has an inner wall body and an outer wall body formed inside and outside in the radial direction, and the inner wall body of the outer ring supported body is interposed between the inner wall body and the outer wall body of the inner ring supported body. The outer ring body is disposed so as to be positioned between the inner wall body and the outer wall body of the outer ring supported body, the inner ring is placed on the inner wall body of the inner ring supported body, and the inner wall body of the outer ring supported body The outer ring is fixed to the inner ring body, the rotor of the driving body is fixed to one of the inner 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. Of the outer wall of the support and the outer ring supported body The object to be detected of the rotation sensor on one of the walls, to fix the detection means of the rotation sensor to the other.

  With such a configuration, when the rotor of the driving body is fixed to the inner 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 outer wall body of the inner ring supported body and the outer wall body of the outer 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 3] Further, the rolling bearing device having the radial plane arrangement structure of the rotation sensor of the invention 3 is the rolling bearing device having the radial plane arrangement structure of the rotation sensor of any one of the inventions 1 and 2, in the rolling bearing device. The bearing is a cross 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 4] Furthermore, the rolling bearing device having the radial plane arrangement structure of the rotation sensor of the invention 4 is the rolling bearing device having the radial plane arrangement structure of the rotation sensor of any one of the inventions 1 to 3, wherein the rotation The sensor has an annular detection object in which one of an inner periphery and an outer periphery is decentered with respect to the axis of the rolling bearing, and detection means for detecting a change in reluctance between the detection object, The detected body is placed on one of the inner ring supported body and the outer ring supported body, and the detecting means is placed on the other side so that the eccentric side of the inner circumference and outer circumference of the detected body faces the detecting means. Provided.

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.

[Invention 5] Further, the rolling bearing device having the radial plane arrangement structure of the rotation sensor of the invention 5 is the rolling bearing device having the radial plane arrangement structure of the rotation sensor of any one of the inventions 1 to 4, wherein the rotation The sensor includes a first resolver having a first resolver rotor and a second resolver having a second resolver rotor, and the first resolver rotor and the second resolver rotor are spaced apart from each other via a rotor spacer. It is arranged and attached by two fixing means.
With such a configuration, the first resolver rotor and the second resolver rotor are independently fixed by the two fixing means.

[Invention 6] Further, the rolling bearing device having the radial plane arrangement structure of the rotation sensor of the invention 6 is the rolling bearing device having the radial plane arrangement structure of the rotation sensor of any one of the inventions 1 to 5, wherein the inner ring In the supported body, a wiring pipe that penetrates from the radially inner side to the radially outer side of the inner ring supported body and accommodates the wiring of the rotation sensor is formed, and the height D of the wiring pipe is determined by the rotation sensor. Assuming that the diameter of one of the wirings is d and the predetermined margin is α (0 <α <d), the value obtained by D = 2d + α is set.
With such a configuration, the height of the wiring pipe is reduced. Further, one cross is allowed for a plurality of wires of the rotation sensor.

[Invention 7] Furthermore, the rolling bearing device having the radial plane arrangement structure of the rotation sensor of the invention 7 is the rolling bearing device having the radial plane arrangement structure of the rotation sensor of any one of the inventions 1 to 6, An inner ring presser for fixing the inner ring to the inner ring supported body in the axial direction is provided, and the inner ring presser is formed with a bolt hole in the axial direction for inserting a bolt for fixing the inner ring presser. The wall thickness ti of the outer peripheral surface and the inner wall surface of the bolt hole was set to a value in the range of pi <ti <2pi, where the length of one pitch of the bolt hole is pi.
With such a configuration, when a bolt is screwed into the bolt hole of the inner ring presser, the outer peripheral surface of the inner ring presser is pushed out to the inner ring side, and the inner ring is locked, so that the inner ring can be fixed without a gap.

[Invention 8] Further, the rolling bearing device having the radial plane arrangement structure of the rotation sensor of the invention 8 is the rolling bearing device having the radial plane arrangement structure of the rotation sensor of any one of the inventions 1 to 7, An outer ring presser that fixes the outer ring to the outer ring supported body in the axial direction is provided, and the outer ring presser is formed with a bolt hole through which a bolt for fixing the outer ring presser is inserted in the axial direction. The wall thickness to of the inner peripheral surface and the inner wall surface of the bolt hole was set to a value in the range of po <to <2po, where the length of one pitch of the bolt hole is po.
With such a configuration, when a bolt is screwed into the bolt hole of the outer ring presser, the inner peripheral surface of the outer ring presser is pushed out to the outer ring side, and the outer ring is locked, so that the outer ring can be fixed without a gap.

  As described above, according to the rolling bearing device having the radial planar arrangement structure of the rotation sensor according to the first aspect, the rotation sensor is arranged at a position where the gap change is small even when a moment load is applied to the rolling bearing device. Therefore, 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 rolling bearing, the driving body, and the rotation sensor 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 can be increased in diameter by arranging the rotation sensor on the outermost side in the radial direction, it is possible to stabilize the accuracy at the time of mold processing and realize higher detection accuracy. The effect is also obtained. Furthermore, since the rolling bearing is arranged at the innermost side in the radial direction, the height of the rolling bearing device can be reduced by reducing the size of the rolling bearing, and wiring to the driving body or the rotation sensor can be performed. It is easy to obtain the effect that the grease of the rolling bearing is difficult to leak.

Further, according to the rolling bearing device having the radial planar arrangement structure of the rotation sensor of the invention 3, since moment load, axial load and radial load can be simultaneously received, while maintaining rigidity against the axial load and radial load, It is possible to reduce the gap change due to the moment load.
Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the rotation sensor according to the fifth aspect of the invention, the first resolver rotor and the second resolver rotor can be fixed independently, so the first resolver rotor and the second resolver rotor. The effect that each of the positions in the axial direction can be adjusted is obtained.

  Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the rotation sensor of the invention 6, since the height of the wiring pipe is reduced, an effect that the height of the rolling bearing device can be reduced is obtained. In addition, since one cross is allowed for a plurality of wirings of the rotation sensor, it is possible to reduce the possibility that the workability of accommodating the wiring of the rotation sensor in the wiring pipe is reduced.

Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the rotation sensor of the seventh aspect, the inner ring can be fixed without a gap, so that the detection accuracy can be improved.
Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the rotation sensor according to the eighth aspect of the invention, the outer ring can be fixed without a gap, so that the detection accuracy can be improved.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of a rolling bearing device having a radial planar arrangement structure of a rotation sensor 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 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 cross roller 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 radial inner side.

  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 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 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 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 a bolt 28a. It is fixed by fastening to the body 12a.
The stator 22 is fixed to the fixed plate 24 by bolts 24a, and the rotor 12 constitutes an 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 inner wall body 12 a of the rotor 12 together with the outer ring retainer 28. On the other hand, the coil 16b is attached to the inner peripheral surface of the outer wall 22b of the stator 22 by a bolt 16c.

  The resolver 30 is disposed in 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 resolver rotor 18 facing the resolver rotor 18 at a predetermined interval. It has a position detector 20 (resolver stator) for detecting a change. The resolver rotor 18 is attached to the outer wall 12b of the rotor 12 by bolts 18a. On the other hand, the position detector 20 is attached to the outer peripheral surface of the outer wall body 22b of the stator 22 by a bolt 20a. By resolving the resolver rotor 18 eccentrically and changing the distance between the resolver rotor 18 and the position detector 20 in the circumferential direction, the reluctance changes according to 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.

  When the coil 16b is energized, the rotor 12 and the resolver rotor 18 rotate together, the reactance change is detected by the position detector 20, and the rotational speed and positioning are controlled by a controller (not shown). It has become.

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. A change in reluctance between the position detector 20 and the resolver rotor 18 that rotates integrally with the rotor 12 is detected, and a controller (not shown) controls rotation 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 cross roller bearing 14, the motor part 16, and the resolver 30 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, 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.
Further, since the resolver 30 is disposed on the outermost side in the radial direction, the diameter of the resolver 30 can be increased.

  Further, the cross roller bearing 14 has a larger cross-sectional dimension as the shaft diameter increases. Therefore, if the size of the cross roller bearing 14 can be reduced, the cross-sectional dimension can be reduced. And since the cross roller bearing 14 is arrange | positioned inside radial direction, if the cross-sectional dimension of the cross roller bearing 14 can be made small, the height of the thin motor 100 can be made small.

Furthermore, since the cross roller bearing 14 is disposed on the innermost side in the radial direction, wiring to the motor unit 16 or the resolver 30 is easy, and grease of the cross roller bearing 14 is difficult to leak.
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, and the cross roller bearing 14, the motor unit 16, and the resolver 30 are arranged on the same radial plane.

  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 cross roller bearing 14, the motor part 16, and the resolver 30 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, in the present embodiment, the cross roller 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 radial inner side.
Thereby, 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. it can. Further, since the cross roller 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 cross roller bearing 14, and the motor unit 16 or the resolver 30. The cross roller bearing 14 is less likely to leak grease.

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. And a position detector 20 that detects a change in reluctance with the resolver rotor 18.

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 first embodiment, the cross roller bearing 14 corresponds to the rolling bearing of inventions 1 to 4, the stator 22 corresponds to the inner ring supported body of the invention 1, 2, or 4, and the rotor 12 corresponds to the invention. Corresponding to 1, 2 or 4 outer ring supported bodies, the resolver 30 corresponds to the rotation sensor of inventions 1 to 4. The resolver rotor 18 corresponds to the detection object of the invention 2 or 4, the position detector 20 corresponds to the detection means of the invention 2 or 4, and the motor unit 16 corresponds to the drive body of the invention 1 or 2. The permanent magnet 16a corresponds to the rotor of the invention 2, and the coil 16b corresponds to the stator of the invention 2.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 thru | or 4 is a figure which shows 2nd Embodiment of the rolling bearing apparatus which has the radial direction planar structure of the rotation sensor which concerns on this invention.

First, the configuration of the resolver 30 will be described.
FIG. 2 is a sectional view in the axial direction of the thin motor 100 according to the present embodiment.
As shown in FIG. 2, the resolver 30 is a ring-shaped annular rotor in which a plurality of stator poles are formed at equal intervals in the circumferential direction. It is an outer rotor type resolver comprised including the position detector which consists of a laminated iron core. In FIG. 2, one resolver 30 (upward in the axial direction) is disposed to face the resolver rotor 18 ra and an annular resolver rotor 18 ra having an inner periphery that is eccentric with respect to the axis of the cross roller bearing 14. This is an ABS (Absolute) type unipolar resolver that has a position detector 20sa and outputs a unipolar resolver signal in which the fundamental wave component of the reluctance change is one cycle per revolution of the resolver rotor 18ra. The other resolver 30 (downward in the axial direction) includes a resolver rotor 18ri in which a plurality of salient pole-shaped teeth are formed at equal intervals in the circumferential direction, and a position detector 20si arranged to face the resolver rotor 18ri. It is an INC (Increment) type multipolar resolver that outputs a multipolar resolver signal in which the fundamental wave component of the reluctance change has multiple cycles per revolution of the resolver rotor 18ri.

The resolver rotors 18 ra and 18 ri are arranged with a minute interval via a rotor spacer 42. The resolver rotor 18ra is fixed and attached between the inner peripheral surface of the outer wall 12b of the rotor 12 and the upper surface of the rotor spacer 42 by bolts 18a. The resolver rotor 18ri is attached to the lower surface of the rotor spacer 42 by bolts 18b.
FIG. 3 is a bottom view of the rotor spacer 42.

4 is a cross-sectional view in the axial direction along the line AOA ′ of FIG.
As shown in FIG. 3, a bolt hole 46a through which the bolt 18a is inserted and a bolt hole 46b through which the bolt 18b is inserted are formed on the lower surface of the rotor spacer 42. Six bolt holes 46a are formed at intervals of 60 ° in the circumferential direction of the rotor spacer 42, and two bolt holes 46a are formed at intervals of 15 ° counterclockwise from the bolt holes 46a immediately below FIG. The bolt holes 46b are respectively formed at 15 ° positions clockwise from the respective bolt holes 46a formed at intervals of 60 °.

As shown in FIG. 4, the bolt hole 46 a penetrates the rotor spacer 42 in the axial direction, and the counterbore depth reaches about half of the rotor spacer 42 in the axial direction. The depth of the bolt hole 46 b reaches about half of the axial direction of the rotor spacer 42.
On the other hand, as shown in FIG. 2, the position detectors 20sa and 20si are arranged at a minute interval via a stator spacer 44. The position detector 20si is fixed and attached between the outer peripheral surface of the outer wall body 22b of the stator 22 and the lower surface of the stator spacer 44 by a bolt 20a. The position detector 20sa is attached to the upper surface of the stator spacer 44 by a bolt 20b.

Next, the configuration of the stator 22 will be described.
As shown in FIG. 2, the stator 22 is formed with a wiring pipe 48 penetrating from the radially inner side to the radially outer side of the stator 22. The wiring pipe 48 accommodates the wiring of the resolver 30.
The height D of the wiring pipe 48 is set to a value obtained by the following expression (1), where d is the diameter of one wiring of the resolver 30 and α is a predetermined margin (0 <α <d). .

D = 2d + α (1)

The wiring of the resolver 30 is composed of a plurality of wirings such as a power line and a ground line. If these wires can be arranged horizontally without twisting, the height D of the conduit can be d. However, in reality, the wires cross in the axial direction. Therefore, it is preferable to set 2d + α in consideration of one cross (d).

Next, the configuration of the inner ring presser 26 and the outer ring presser 28 will be described.
As shown in FIG. 2, the inner ring retainer 26 is formed with a bolt hole 26c through which the bolt 26a is inserted. In the first embodiment, the thickness of the outer peripheral surface of the inner ring retainer 26 and the inner wall surface of the bolt hole 26c is a thickness corresponding to the length of approximately three pitches of the bolt hole 26c. On the other hand, in the present embodiment, the wall thickness ti of the outer peripheral surface of the inner ring presser 26 and the inner wall surface of the bolt hole 26c is expressed by the following equation (2), where pi is the length of one pitch of the bolt hole 26c. Set to a range value. Therefore, when the bolt 26a is screwed into the bolt hole 26c, the outer peripheral surface of the inner ring retainer 26 is pushed out toward the inner ring 14a, and the inner ring 14a is locked, so that the inner ring 14a can be fixed without a gap. Therefore, detection accuracy can be improved.

pi <ti <2pi (2)

In the above equation (2), when the wall thickness ti is 2 pi or more, the action of pushing the outer peripheral surface of the inner ring presser 26 is reduced, and it becomes difficult to fix the inner ring 14a without a gap, while the wall thickness ti is pi or less. There is a possibility of destroying the inner wall of the bolt hole 26c. Therefore, it is preferable to set the value obtained by the above equation (2).

As shown in FIG. 2, the outer ring retainer 28 is formed with a bolt hole 28c through which the bolt 28a is inserted. In the first embodiment, the thickness of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is a thickness corresponding to the length of approximately three pitches of the bolt hole 28c. On the other hand, in this embodiment, the wall thickness to of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is expressed by the following equation (3), where the length of one pitch of the bolt hole 28c is po. Is set to a value in the range. Therefore, when the bolt 28a is screwed into the bolt hole 28c, the inner peripheral surface of the outer ring retainer 28 is pushed out to the outer ring 14b side, and the outer ring 14b is locked, so that the outer ring 14b can be fixed without a gap. Therefore, detection accuracy can be improved.

po <to <2po (3)

In the above equation (3), if the wall thickness to is 2 p0 or more, the action of pushing the inner peripheral surface of the outer ring presser 28 is reduced, and it becomes difficult to fix the outer ring 14a without a gap, while the wall thickness to is less than p0. Then, there is a possibility of destroying the inner wall of the bolt hole 28c. Therefore, it is preferable to set the value obtained by the above equation (3).

In this way, in the present embodiment, the resolver rotors 18ra and 18ri are arranged with a minute interval through the rotor spacer 42 and are attached by the two bolts 18a and 18b, respectively.
Thereby, since the resolver rotors 18ra and 18ri can be fixed independently, the position of the resolver rotors 18ra and 18ri in the axial direction can be adjusted.

Furthermore, in the present embodiment, the position detectors 20sa and 20si are arranged with a small interval through the stator spacer 44 and are attached by two bolts 20a and 20b, respectively.
Thereby, since the position detectors 20sa and 20si can be independently fixed, the position of the position detectors 20sa and 20si in the axial direction can be adjusted.

Furthermore, in the present embodiment, the resolver 30 is configured as an ABS type and INC type resolver.
Thereby, the influence of a gap change can be reduced effectively.
Furthermore, in the present embodiment, the height D of the wiring pipe 48 is set to a value obtained by the above equation (1).

Thereby, since the height of the wiring pipe 48 becomes small, the height of the thin motor 100 can be made small. Further, since one cross is allowed for the plurality of wirings of the resolver 30, it is possible to reduce the possibility that workability of housing the wiring of the resolver 30 in the wiring pipe 48 is lowered.
Further, in the present embodiment, the wall thickness ti of the outer peripheral surface of the inner ring presser 26 and the inner wall surface of the bolt hole 26c is set to a value obtained by the above equation (2).

Thereby, since the inner ring 14a can be fixed without a gap, the detection accuracy can be improved.
Further, in the present embodiment, the wall thickness to of the inner peripheral surface of the outer ring presser 28 and the inner wall surface of the bolt hole 28c is set to a value obtained by the above equation (3).
Thereby, since the outer ring 14b can be fixed without a gap, the detection accuracy can be improved.

  In the second embodiment, the stator 22 corresponds to the inner ring supported body of the invention 6 or 7, the rotor 12 corresponds to the outer ring supported body of the invention 8, and the resolver 30 corresponds to the invention 5 to 8. Corresponding to the rotation sensor, the resolver rotor 18ra corresponds to the first resolver rotor of the fifth aspect. The resolver rotor 18ri corresponds to the second resolver rotor of the fifth invention, and the bolts 18a and 18b correspond to the fixing means of the fifth invention.

In the first and second embodiments, the outer side of the thin motor 100 is configured as an outer rotor type. However, the present invention is not limited to this, and the inner side of the thin motor 100 is configured as an inner rotor type. You can also In this case, the rotor 12 becomes an inner ring supported body, and the stator 22 becomes an outer ring supported body.
In the first embodiment, the resolver rotor 18 is attached to the outer wall 12b of the rotor 12 and the position detector 20 is attached to the outer peripheral surface of the outer wall 22b of the stator 22. The position detector 20 may be attached to the outer wall body 12b of the rotor 12, and the resolver rotor 18 may be attached to the outer peripheral surface of the outer wall body 22b of the stator 22.

  Further, in the first embodiment, the ABS type resolver 30 is provided in which the fundamental wave component of the reluctance change is one cycle per rotation of the rotor 12. However, the present invention is not limited to this. These teeth may be formed by forming a plurality of poles in the resolver stator and providing an INC type resolver in which the fundamental wave component of the reluctance change is multi-cycle per rotation of the rotor 12. In the case of an INC type resolver, the resolver 30 is arranged on the outermost side in the radial direction, whereby the diameter of the resolver 30 can be increased, so that the tooth shape can be increased even with the same number of teeth. Moreover, it can also be configured as an ABS type and INC type resolver as in the second embodiment.

Moreover, it can replace with the resolver 30 and can also comprise and provide the tape scale which detects the mark formed in the circumferential direction.
In the second embodiment, the ABS type and INC type resolver are provided. However, the present invention is not limited to this, and the ABS type and INC type resolver can be used alone, or only the INC type resolver can be used. It can also be configured from an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal.

  Further, in the first and second embodiments, 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 of the stator 22 is formed. It is also possible to configure 22b as a separate member and attach 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 first and second embodiments, 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 thereto, and the inner wall body 12a or the outer wall body of the rotor 12 is not limited thereto. It is also possible to configure 12b as a separate member and attach it to the rotor 12. Further, the outer ring retainer 28 can be directly attached to the rotor 12 without forming the inner wall body 12a of the rotor 12, but in this case, the outer ring retainer 28 constitutes the inner wall body of the rotor 12.

In the first and second embodiments, the cross roller bearing 14, the motor unit 16, and the resolver 30 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. The cross roller bearing 14 and the cross roller bearing 14 may not be arranged on the same plane.
Moreover, in the said 1st and 2nd embodiment, although the cross roller bearing 14 was applied, it is not limited to this, A four-point contact ball bearing, an angular ball bearing, a deep groove ball bearing, a cylindrical roller bearing, A tapered roller bearing or the like may be applied. 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.

  In the first and second embodiments, the rolling bearing device having the radial planar arrangement structure of the rotation sensor according to the present invention is applied to a structure that rotatably supports the stator 22 and the rotor 12. The present invention is not limited to this, and any structure can be applied 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 thin motor 100 which concerns on this Embodiment. 4 is a bottom view of a rotor spacer 42. FIG. FIG. 4 is a cross-sectional view in the axial direction along the line AO-A ′ of FIG. 3. 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 part 16a Permanent magnet 16b Coil 30 Resolver 18 Resolver rotor 20 Position detector 22 Stator 12a, 22a Inner wall body 12b, 22b Outer wall body 26 Inner ring presser 28 Outer ring presser 26b, 28b Press part 16c, 18a, 20a, 24a, 26a, 28a Bolt 24 Fixing plate 220 Housing inner 18ra, 18ri Resolver rotor 20sa, 20si Position detector 18b, 20b Bolt 26c, 28c, 46a, 46b Bolt hole 42 Rotor spacer 44 Stator spacer 48 Wiring pipe

Claims (8)

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 rolling bearing device having a radial plane arrangement structure of a rotation sensor, wherein the rolling bearing, the driving body and the rotation sensor are arranged in the same order in the radial direction from the inside in the radial direction. In claim 1,
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 outer ring supported body is an inner wall body and an outer wall body of the inner ring supported body. Between, the outer wall body of the inner 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 outer ring supported body,
Fixing the inner ring to the inner wall of the inner ring supported body, and fixing the outer ring to the inner wall of the outer ring supported body;
The rotor of the driving body is fixed to one of the inner 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,
A radial direction of the rotation sensor, characterized in that a detected body of the rotation sensor is fixed to one of the outer wall body of the inner ring supported body and the outer wall body of the outer ring supported body, and a detection means of the rotation sensor is fixed to the other. A rolling bearing device having a planar arrangement structure. In any one of Claim 1 and 2,
The rolling bearing device having a radial planar arrangement structure of a rotation sensor, wherein the rolling bearing is a cross roller bearing or a four-point contact ball bearing. In any one of Claims 1 thru | or 3,
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 radial planar arrangement structure of a rotation sensor, characterized in that means is provided. In any one of Claims 1 thru | or 4,
The rotation sensor comprises a first resolver having a first resolver rotor and a second resolver having a second resolver rotor,
The first planar resolver rotor and the second resolver rotor are arranged at a minute interval via a rotor spacer and are attached by two fixing means, respectively, in a radial plane arrangement of the rotation sensor A rolling bearing device having a structure. In any one of Claims 1 thru | or 5,
The inner ring supported body is formed with a wiring pipe that penetrates from the radially inner side of the inner ring supported body to the radially outer side and accommodates the wiring of the rotation sensor,
The height D of the wiring pipe is defined as follows. The diameter of one wiring of the rotation sensor is d, and the predetermined margin is α (0 <α <d).
D = 2d + α
A rolling bearing device having a radial planar arrangement structure of a rotation sensor, characterized in that it is set to a value obtained by. In any one of Claims 1 thru | or 6,
And an inner ring presser for fixing the inner ring to the inner ring supported body in the axial direction,
In the inner ring presser, a bolt hole for inserting a bolt for fixing the inner ring presser is formed in the axial direction,
The wall thickness ti of the outer peripheral surface of the inner ring presser and the inner wall surface of the bolt hole is defined as pi where the length of one pitch of the bolt hole is pi.
pi <ti <2pi
A rolling bearing device having a radial planar arrangement structure of a rotation sensor, characterized in that it is set to a value in the range. In any one of Claims 1 thru | or 7,
And an outer ring presser for fixing the outer ring to the outer ring supported body in the axial direction,
In the outer ring presser, a bolt hole for inserting a bolt for fixing the outer ring presser is formed in the axial direction,
The wall thickness to of the inner peripheral surface of the outer ring presser and the inner wall surface of the bolt hole is defined as po for the length of one pitch of the bolt hole.
po <to <2 po
A rolling bearing device having a radial planar arrangement structure of a rotation sensor, characterized in that it is set to a value in the range.

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