WO2011111550A1

WO2011111550A1 - Torque measurement method for rolling bearing device, torque measurement device for rolling bearing device, torque measurement method for rolling bearing and torque measurement device for rolling bearing

Info

Publication number: WO2011111550A1
Application number: PCT/JP2011/054236
Authority: WO
Inventors: 貴之小坂
Original assignee: セイコーインスツル株式会社
Priority date: 2010-03-12
Filing date: 2011-02-25
Publication date: 2011-09-15
Also published as: JP2011191149A

Abstract

Disclosed is a torque measurement method for a rolling bearing device (10) comprising a shaft (21) formed as a cylindrical column, a cylindrical sleeve (23) disposed coaxially to the shaft at a predetermined distance from the outer surface thereof, and a rolling bearing disposed between the shaft and the sleeve with the inner ring fixed to the shaft and the outer ring fixed to the sleeve, wherein a load cell (44) equipped with a measurement terminal (51) capable of detecting torque is used to measure the torque of the rolling bearing device by causing one element among the shaft or the sleeve of the roller bearing device to rotate, pressing the measurement terminal against the other part with a prescribed force, and detecting the frictional force on the measurement terminal.

Description

Torque measuring method for rolling bearing device, torque measuring device for rolling bearing device, torque measuring method for rolling bearing, and torque measuring device for rolling bearing

The present invention relates to a torque measuring method for a rolling bearing device, a torque measuring device for the rolling bearing device, a torque measuring method for the rolling bearing, and a torque measuring device for the rolling bearing.

2. Description of the Related Art Conventionally, an information recording / reproducing apparatus such as a hard disk for storing and reproducing various kinds of information on a disk magnetically or optically is known. Generally, an information recording / reproducing apparatus includes an actuator having a swing arm provided with a magnetic head for recording / reproducing a signal on / from a disk. This actuator is rotatably supported by a bearing device provided on the base end side. In other words, the swing arm can be rotated along a horizontal plane by rotating this bearing device, and the signal is recorded and reproduced by moving the magnetic head at the tip of the swing arm to a predetermined position on the disk. be able to.

In recent years, as the capacity of hard disks and the like in computer equipment has increased, the recording density of information within a single recording surface has increased, and in order to cope with this, it is desired to improve the accuracy of position control of the magnetic head. As described above, in order to improve the position control of the magnetic head, it is necessary for the bearing device to rotate with a predetermined stable torque. Therefore, a torque tester for measuring the torque of the bearing device has been proposed (see, for example, Patent Documents 1 to 3).

Japanese Patent No. 3458938 Japanese Patent No. 3341475 JP 2009-37674 A

Incidentally, when measuring the torque of the bearing device using conventional torque measuring devices such as Patent Documents 1 to 3, a load cell 102 having a measuring terminal 101 is used as shown in FIG. Then, the arm member 105 fitted to the outer peripheral surface 104a of the sleeve 104 of the bearing device 103 is attached, and the sleeve 104 is rotated by rotating the shaft 106 of the bearing device 103 about the axis. Then, since the arm member 105 also rotates around the axis together with the sleeve 104, the torque of the bearing device 103 is measured by bringing the projection 105a of the arm member 105 into contact with the measurement terminal 101.

When torque measurement is performed in such a configuration, the load cell 102 of the torque measurement device and the arm member 105 that is attached to the bearing device 103 and presses the measurement terminal 101 of the load cell 102 are not fixed. Although the torque measurement can be performed normally when the button is pressed, the load cell 102 and the arm member 105 may be separated due to the repulsive force of the load cell 102 (measurement terminal 101) even during the torque measurement. When such a phenomenon occurs, accurate torque measurement cannot be performed.

In addition, if vibration in a direction different from the measurement occurs when performing torque measurement, it appears as noise in the torque measurement data, so that a minute torque cannot be measured accurately. Furthermore, since the tip of the measurement terminal 101 of the load cell 102 is in a free state, it vibrates even with slight external vibration or force, causing noise. In particular, this noise often includes various natural frequency components of the load cell 102.

In addition, as described above, when noise is generated, the noise can be removed by a filter. At the same time, torque fluctuations of the latest frequency component with respect to vibration in a direction different from the torque measurement are also removed. Therefore, accurate torque measurement cannot be performed.

FIG. 25 shows the torque waveform measured by the conventional method, and FIG. 26 shows the frequency analysis result of the torque waveform measured by the conventional method. As shown in FIGS. 25 and 26, an accurate torque waveform could not be measured due to the influence of noise.

Further, since the conventional method measures the torque by pressing the arm member 105 from one direction to the load cell 102, the torque change during the forward / reverse rotation operation cannot be measured continuously.

Furthermore, since the torque is measured through the arm member 105 attached to the bearing device 103, the distance from the rotation center of the bearing device 103 to the measurement point is increased, and the force measured by the load cell 102 is reduced. Therefore, the measurement resolution of the torque measuring device is lowered.

And, in order to measure the torque of the bearing device 103, it is necessary to attach the arm member 105, and the production efficiency is lowered due to the installation work. Further, there is a risk that the bearing device 103 may be scratched or dusted when the arm member 105 is attached.

Therefore, the present invention has been made in view of the above-described circumstances, and there is little noise and a torque measuring method for a rolling bearing device capable of measuring a minute torque, a torque measuring device for a rolling bearing device, and a rolling bearing. A torque measuring method and a torque measuring device for a rolling bearing are provided.

In order to solve the above problems, the present invention provides the following means.

A torque measurement method for a rolling bearing device according to the present invention includes a shaft formed in a columnar shape, a cylindrical sleeve disposed coaxially with the shaft at a predetermined interval from the outer peripheral surface of the shaft, A torque measuring method for a rolling bearing device, comprising: a rolling bearing disposed between a shaft and the sleeve, wherein an inner ring is fixed to the shaft and an outer ring is fixed to the sleeve. Using a load cell having a possible measurement terminal, one of the shaft or the sleeve of the rolling bearing device is rotated about the axis, and the measurement terminal is pressed against the other with a predetermined force, and the friction force of the measurement terminal The torque of the rolling bearing device is measured by detecting the above.

Thus, the torque of the rolling bearing device can be measured simply by bringing the measuring terminal of the load cell into contact with the rolling bearing device so as to press it with a predetermined force. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Furthermore, by pressing the tip of the measurement terminal of the load cell against the shaft or sleeve, it becomes difficult to be affected by external vibration and force, and noise can be reduced. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Furthermore, since it is not necessary to attach a torque measurement member to the rolling bearing device, it is possible to prevent the rolling bearing device from being damaged, and to eliminate the mounting work of the torque measurement member and to improve production efficiency. it can. And since the distance from the rotation center of a rolling bearing apparatus to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

The torque measurement method for the rolling bearing device according to the present invention includes a shaft formed in a columnar shape, a plurality of rolling bearings having an inner ring fixed to the outer peripheral surface of the shaft, and an outer ring of the adjacent rolling bearing. A rolling bearing device torque measurement method comprising: a load cell having a measurement terminal capable of detecting torque; and one of the shaft or the outer ring and the spacer of the rolling bearing device. , The measuring terminal is pressed with a predetermined force, and the frictional force of the measuring terminal is detected to measure the torque of the rolling bearing device.

In this way, even in a rolling bearing device in which a plurality of rolling bearings are arranged on the shaft with a predetermined interval by the spacer, the measurement terminal of the load cell is connected to the outer peripheral surface of the shaft of the rolling bearing device, the outer ring of the rolling bearing, and the spacer. The torque of the rolling bearing device can be measured simply by making contact with either one of the outer peripheral surfaces with a predetermined force. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Furthermore, since it is not necessary to attach a torque measurement member to the rolling bearing device, it is possible to prevent the rolling bearing device from being damaged, and to eliminate the mounting work of the torque measurement member and to improve production efficiency. it can. And since the distance from the rotation center of a rolling bearing apparatus to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

In the rolling bearing device torque measuring method according to the present invention, the above-described rolling bearing device is further provided with a swing arm that is fitted to the sleeve or the outer ring and configured to be rotatable about an axis. A torque measurement method for a bearing device, wherein one of the shaft or the sleeve, the outer ring and the spacer of the rolling bearing device is rotated about an axis, and the measurement terminal is pressed against the other with a predetermined force, The torque of the rolling bearing device is measured by detecting the frictional force of the measuring terminal.

As described above, even in a rolling bearing device provided with a swing arm configured to be rotatable about the axis, the measurement terminal of the load cell is connected to the outer peripheral surface of the shaft of the rolling bearing device or the tip end surface of the swing arm (the other). It is possible to measure the torque of the rolling bearing device simply by bringing it into contact with a predetermined force. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Furthermore, since it is not necessary to attach a torque measurement member to the rolling bearing device, it is possible to prevent the rolling bearing device from being damaged, and to eliminate the mounting work of the torque measurement member and to improve production efficiency. it can. And since the distance from the rotation center of a rolling bearing apparatus to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

Further, in the torque measuring method for a rolling bearing device according to the present invention, the measuring terminal is moved from the direction perpendicular to the tangential direction of the rotation to the other outer peripheral surface in a state where the one is rotated about the axis. The torque of the rolling bearing device is measured by bringing the measuring terminal into contact with a predetermined force.

In this way, the load cell measurement terminal is simply brought into contact with the outer peripheral surface of one of the shaft or sleeve of the rolling bearing device and the outer ring so as to be pressed with a predetermined force from the direction perpendicular to the tangential direction of rotation. The torque of the rolling bearing device can be measured. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Furthermore, by pressing the tip of the measurement terminal of the load cell against the shaft or sleeve, it becomes difficult to be affected by external vibration and force, and noise can be reduced. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Furthermore, since it is not necessary to attach a torque measurement member to the rolling bearing device, it is possible to prevent the rolling bearing device from being damaged, and to eliminate the mounting work of the torque measurement member and to improve production efficiency. it can. And since the distance from the rotation center of a rolling bearing apparatus to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

Further, in the torque measuring method for a rolling bearing device according to the present invention, the measuring terminal is moved from the axial center direction to the other axial end face in a state where the one is rotated about the axial center. It is characterized in that the torque of the rolling bearing device is measured by abutting it so as to be pressed by force.

Thus, the torque of the rolling bearing device can be measured simply by bringing the measuring terminal of the load cell into contact with the axial end surface of one of the shaft or sleeve and outer ring of the rolling bearing device with a predetermined force. it can. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Furthermore, since it is not necessary to attach a torque measurement member to the rolling bearing device, it is possible to prevent the rolling bearing device from being damaged, and to eliminate the mounting work of the torque measurement member and to improve production efficiency. it can. And since torque measurement can be performed in the vicinity of the rotation center of the rolling bearing device, the force to be measured is larger than in the prior art, and torque measurement with higher resolution can be performed.

The torque measurement method for a rolling bearing device according to the present invention includes: a distal end portion where the measurement terminal is in contact with the rolling bearing device; and a proximal end portion disposed between the distal end portion and the load cell main body portion. And the tip portion is made of a material having higher hardness than the base end portion.

With such a configuration, the torque can be measured accurately and the durability of the measurement terminal can be improved by using a high hardness material with good wear resistance at the tip. Further, the torque can be measured more accurately by using a material having a low hardness and is difficult to apply a lateral pressure to the base end portion.

Further, the torque measuring method for the rolling bearing device according to the present invention is characterized in that the constituent material of the measuring terminal has an Asker C hardness of 10 or more and a Shore A hardness of 40 or less.

Thus, when the constituent material of the measurement terminal is a Shore A hardness of 40 or less, the output of the load cell can be stabilized even if the pressing force changes. Moreover, it can suppress that durability of a measurement terminal falls that the constituent material of a measurement terminal is Asker C hardness 10 or more.

The torque measuring method for a rolling bearing device according to the present invention uses a plurality of the load cells, arranges the plurality of load cells so as to cancel each other's pressing force of the plurality of load cells against the rolling bearing device, and It is characterized by measuring the torque of the bearing device.

With this configuration, the load generated by pressing the measurement terminal of the load cell against the rolling bearing device can be canceled, so that the torque of the rolling bearing device can be measured more accurately.

Further, the torque measuring method of the rolling bearing device according to the present invention is the torque at the time of forward rotation of the rolling bearing device by reversing the rotation direction in a state where the measuring terminal is in contact with the one or the other. And the torque during reverse rotation are measured continuously.

With this configuration, it is possible to continuously measure torque fluctuations in an operation that repeats forward and reverse rotation, that is, a swinging operation. At this time, torque hysteresis can be measured. Therefore, the evaluation according to the actual use form of the rolling bearing device can be performed.

In addition, a torque measuring device for a rolling bearing device according to the present invention includes a motor that rotates the one of the rolling bearing devices according to any of the above described above about an axis, and a state in which the one is rotated about the axis. A load cell capable of measuring the torque of the rolling bearing device by detecting a frictional force of the supporting member that supports the rolling bearing device, and having a measuring terminal that can be brought into contact with and separated from the other; It is characterized by having.

With this configuration, the torque of the rolling bearing device is measured with a simple configuration in which the measurement terminal of the load cell is brought into contact with the rolling bearing device mounted on the support member so as to be pressed with a predetermined force. be able to. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Furthermore, since it is not necessary to attach a torque measurement member to the rolling bearing device, it is possible to prevent the rolling bearing device from being damaged, and to eliminate the mounting work of the torque measurement member and to improve production efficiency. it can. And since the distance from the rotation center of a rolling bearing apparatus to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

The rolling bearing torque measuring method according to the present invention includes a substantially cylindrical inner ring, a substantially cylindrical outer ring disposed coaxially with the inner ring at a predetermined interval from the outer circumferential surface of the inner ring, A rolling bearing torque measurement method comprising a rolling element interposed between an inner ring and the outer ring, wherein a load cell having a measuring terminal capable of detecting torque is used, and the inner ring of the rolling bearing or One of the outer rings is rotated about its axis, the other is pressed against the other with a predetermined force, and the torque of the rolling bearing is measured by detecting the frictional force of the measurement terminal.

Thus, the torque of the rolling bearing can be measured simply by bringing the measuring terminal of the load cell into contact with the rolling bearing so as to press it with a predetermined force. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Further, since there is no need to attach a torque measuring member to the rolling bearing, it is possible to prevent the rolling bearing from being damaged, and it is possible to omit the attaching operation of the torque measuring member and improve the production efficiency. And since the distance from the rotation center of a rolling bearing to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

Further, in the torque measurement method for a rolling bearing according to the present invention, the measuring terminal is moved from the direction perpendicular to the tangential direction of the rotation to the other peripheral surface in a state where the one is rotated about the axis. It is characterized in that the torque of the rolling bearing is measured by bringing the measuring terminal into contact with a predetermined force.

In this way, the load cell measuring terminal is simply brought into contact with the circumferential surface of either the inner ring or the outer ring of the rolling bearing so as to be pressed with a predetermined force from a direction perpendicular to the tangential direction of rotation. Torque can be measured. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Furthermore, by pressing the tip of the measurement terminal of the load cell against the inner ring or the outer ring, it becomes difficult to be affected by external vibration and force, and noise can be reduced. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Further, since there is no need to attach a torque measuring member to the rolling bearing, it is possible to prevent the rolling bearing from being damaged, and it is possible to omit the attaching operation of the torque measuring member and improve the production efficiency. And since the distance from the rotation center of a rolling bearing to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

In the rolling bearing torque measuring method according to the present invention, the measuring terminal is moved from the axial center direction to the other axial end face with a predetermined force while the one is rotated about the axial center. The torque of the rolling bearing is measured by bringing it into contact with each other so as to press.

Thus, the torque of the rolling bearing can be measured simply by bringing the measurement terminal of the load cell into contact with the axial end surface of either the inner ring or the outer ring of the rolling bearing with a predetermined force. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Further, since there is no need to attach a torque measuring member to the rolling bearing, it is possible to prevent the rolling bearing from being damaged, and it is possible to omit the attaching operation of the torque measuring member and improve the production efficiency. And since torque measurement can be performed in the vicinity of the rotation center of the rolling bearing, the force to be measured is larger than in the prior art, and torque measurement with higher resolution can be performed.

Further, in the rolling bearing torque measuring method according to the present invention, the measurement terminal includes a distal end portion that is in contact with the rolling bearing device, and a proximal end portion disposed between the distal end portion and the load cell main body portion. The tip portion is made of a material having higher hardness than the base end portion.

Also, the torque measurement method for a rolling bearing according to the present invention is characterized in that the constituent material of the measurement terminal is an Asker C hardness of 10 or more and a Shore A hardness of 40 or less.

The torque measurement method for a rolling bearing according to the present invention uses a plurality of the load cells, arranges the plurality of load cells so as to cancel each other's pressing force of the plurality of load cells against the rolling bearing, and It is characterized by measuring torque.

This configuration makes it possible to cancel the load generated by pressing the measurement terminal of the load cell against the rolling bearing, so that the torque of the rolling bearing can be measured more accurately.

In the rolling bearing torque measuring method according to the present invention, the rotation direction is reversed while the measuring terminal is in contact with the one or the other, so that the torque and the reverse rotation of the rolling bearing are reversed. It is characterized by continuously measuring the torque of the hour.

With this configuration, it is possible to continuously measure torque fluctuations in an operation that repeats forward and reverse rotation, that is, a swinging operation. At this time, torque hysteresis can be measured. Therefore, it is possible to evaluate in accordance with the actual usage form of the rolling bearing.

A torque measurement apparatus for a rolling bearing according to the present invention includes a motor that rotates the one of the rolling bearings according to any of the above-described ones about an axis, and the rolling bearing that rotates the one about an axis. And a load cell that has a measurement terminal that can be brought into contact with and separated from the other, and that can measure the torque of the rolling bearing by detecting the frictional force of the measurement terminal. It is characterized by that.

With this configuration, it is possible to measure the torque of the rolling bearing with a simple configuration in which the load cell measurement terminal is brought into contact with the rolling bearing placed on the support member so as to be pressed with a predetermined force. it can. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Further, since there is no need to attach a torque measuring member to the rolling bearing, it is possible to prevent the rolling bearing from being damaged, and it is possible to omit the attaching operation of the torque measuring member and improve the production efficiency. And since the distance from the rotation center of a rolling bearing to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

According to the torque measuring method of the rolling bearing device according to the present invention, the torque of the rolling bearing device can be measured only by bringing the measuring terminal of the load cell into contact with the rolling bearing device so as to press it with a predetermined force. Therefore, the measured torque value is less affected by the load cell noise and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations at the time of measurement is increased. As a result, the torque measurement time can be shortened. Furthermore, since it is not necessary to attach a torque measurement member to the rolling bearing device, it is possible to prevent the rolling bearing device from being damaged, and to eliminate the mounting work of the torque measurement member and to improve production efficiency. it can. And since the distance from the rotation center of a rolling bearing apparatus to a torque measurement point can be shortened, compared with the past, the force to measure becomes large and torque measurement with higher resolution can be performed.

It is a schematic block diagram of the information recording / reproducing apparatus in embodiment of this invention. It is sectional drawing of the pivot axis | shaft in embodiment of this invention. It is a schematic block diagram of the torque measuring device of the pivot shaft in the embodiment of the present invention. It is a perspective view of the load cell in the embodiment of the present invention. It is a top view which shows the state at the time of the torque measurement of the pivot shaft in embodiment of this invention. It is a side view which shows the state of FIG. It is a graph which shows the torque waveform obtained by the torque measurement in embodiment of this invention. It is a graph which shows the frequency analysis result of the torque waveform obtained by the torque measurement in embodiment of this invention. It is a graph which shows the hysteresis of the torque obtained by the torque measurement in embodiment of this invention. It is a schematic block diagram (plan view) which shows another aspect (1) of the torque measurement method in embodiment of this invention. It is a side view which shows another aspect (1) of the measurement terminal in embodiment of this invention. It is a side view which shows another aspect (2) of the measurement terminal in embodiment of this invention. It is a side view which shows another aspect (3) of the measurement terminal in embodiment of this invention. It is a side view which shows another aspect (4) of the measurement terminal in embodiment of this invention. It is sectional drawing which shows another aspect of the pivot axis | shaft in embodiment of this invention. It is a schematic block diagram (side view) which shows another aspect (2) of the torque measuring method in embodiment of this invention. It is a schematic block diagram (side view) which shows another aspect (3) of the torque measuring method in embodiment of this invention. It is a schematic block diagram (side view) which shows another aspect (4) of the torque measuring method in embodiment of this invention. It is a schematic block diagram (plan view) which shows another aspect (5) of the torque measuring method in embodiment of this invention. It is a side view which shows the state of FIG. It is a schematic block diagram (plan view) which shows another aspect (6) of the torque measurement method in embodiment of this invention. It is a schematic block diagram (plan view) which shows another aspect (7) of the torque measurement method in embodiment of this invention. It is a graph which shows the output characteristic according to the hardness (Shore A hardness) of the measurement terminal in embodiment of this invention. It is a schematic block diagram (plan view) showing a conventional torque measuring method. It is a graph which shows the torque waveform obtained by the conventional torque measurement. It is a graph which shows the frequency analysis result of the torque waveform obtained by the conventional torque measurement.

Next, the rolling bearing device and its torque measuring method according to the present invention will be described with reference to FIGS. In the present embodiment, the case where the rolling bearing device is used for the pivot shaft of the information recording / reproducing device will be described.

FIG. 1 is a schematic configuration diagram of an information recording / reproducing apparatus 1 according to the present invention. Note that the information recording / reproducing apparatus 1 of the present embodiment is an apparatus for writing on a disk (magnetic recording medium) D having a perpendicular recording layer by a perpendicular recording method.

As shown in FIG. 1, the information recording / reproducing apparatus 1 includes a carriage 11, a laser light source 20 that supplies a light beam from the proximal end side of the carriage 11 through an optical waveguide 8, and a head supported on the distal end side of the carriage 11. A gimbal assembly (HGA) 12, an actuator 6 that scans and moves the head gimbal assembly 12 in a horizontal plane parallel to the disk surface D1 (the surface of the disk D), and a spindle motor 7 that rotates the disk D about the rotation axis L2. And a control unit 5 for supplying a current modulated according to information to the slider 2 of the head gimbal assembly 12, and a housing 9 for housing these components therein.

The housing 9 has a box-like shape having a top opening made of a metal material such as aluminum, and has a rectangular bottom portion 9a as viewed from above, and a peripheral wall erected in the vertical direction with respect to the bottom portion 9a at the periphery of the bottom portion 9a. (Not shown). And the recessed part which accommodates each component mentioned above is formed in the inner side enclosed by the surrounding wall. In FIG. 1, the peripheral wall surrounding the housing 9 is omitted for easy understanding.

Further, a lid (not shown) is fixed to the housing 9 so as to close the opening of the housing 9. The spindle motor 7 is attached to substantially the center of the bottom portion 9a, and the disk D is fixed to the spindle motor 7.

The actuator 6 described above is attached to one corner of the bottom 9a outside the disk D. The actuator 6 is provided with a carriage 11 that can rotate around a rotation axis L1 in a horizontal plane around a pivot shaft (bearing device) 10. The carriage 11 includes an arm portion 14 extending from the base end portion toward the tip portion (in the direction of the disk D), and a base portion 15 that supports the arm portion 14 in a cantilever manner via the base end portion. However, they are integrally formed by machining or the like. The base portion 15 is formed in a substantially rectangular parallelepiped shape, and is supported by the pivot shaft 10 so as to be rotatable. That is, the base portion 15 is connected to the actuator 6 via the pivot shaft 10, and the pivot shaft 10 is the rotation center of the carriage 11.

The arm portion 14 extends in parallel with the surface direction (horizontal plane direction) of the upper surface of the base portion 15 on the side surface 15b opposite to the side surface 15a to which the actuator 6 is attached in the base portion 15 (side surface on the opposite side of the corner portion). It is a flat plate to be extended, and three pieces are extended along the height direction (vertical direction) of the base 15. Specifically, the arm portion 14 is formed in a tapered shape that tapers from the proximal end portion toward the distal end portion, and is arranged so that the disk D is sandwiched between the

arm portions

14 and 14. That is, the arm part 14 and the disk D are configured to be alternately arranged, and the arm part 14 can be moved in a direction parallel to the surface of the disk D (horizontal plane direction) by driving the actuator 6. . The carriage 11 and the head gimbal assembly 12 are retracted from the disk D by driving the actuator 6 when the rotation of the disk D is stopped.

The head gimbal assembly 12 is connected to the tip of the arm portion 14, and includes a suspension 3 and a slider 2 attached to the tip of the suspension 3. Further, the head gimbal assembly 12 guides a light beam from the laser light source 20 to the slider 2 having a near-field light generating element (not shown) to generate near-field light (spot light), and uses the near-field light to disc Various information is recorded and reproduced in D. Note that the near-field light generating element includes, for example, an optical minute aperture, a protrusion formed in a nanometer size, and the like.

As shown in FIG. 2, the pivot shaft 10 includes a shaft 21 formed in a substantially columnar shape, a substantially cylindrical sleeve 23 arranged at a predetermined distance from the outer peripheral surface 21 a of the shaft 21, and the shaft 21. The first rolling bearing 31 interposed between the shaft 23 and the sleeve 23, and the second rolling bearing interposed between the shaft 21 and the sleeve 23 in parallel with the first rolling bearing 31 at a predetermined interval. 32.

The shaft 21 is a substantially cylindrical rod-like member, and a first rolling bearing 31 is mounted on one end side in the longitudinal direction (axial direction), and the second rolling bearing is spaced apart from the first rolling bearing 31 in the axial direction. 32 is mounted. Further, a flange portion 24 is formed on the end face on one end side of the shaft 21 so as to be larger than the diameter of the shaft 21 and to come into contact with the first rolling bearing 31.

The sleeve 23 is a member formed in a substantially cylindrical shape, and the first rolling bearing 31 is mounted on one end side in the longitudinal direction (axial direction), and the second rolling bearing 32 is mounted on the other end side. In addition, while the first rolling bearing 31 and the second rolling bearing 32 in the sleeve 23 are arranged, the spacer portion 25 that maintains the distance between the first rolling bearing 31 and the second rolling bearing 32 at a predetermined distance is used. It protrudes inward in the direction. In addition, you may comprise the sleeve 23 and the spacer part 25 by another member.

The first rolling bearing 31 and the second rolling bearing 32 are fixed between the outer peripheral surface 21a of the shaft 21 and the inner peripheral surface 23b of the sleeve 23 using an adhesive or the like.

The first rolling bearing 31 and the second rolling bearing 32 are bearings formed in the same shape. Specifically, the first rolling bearing 31 is interposed between the inner ring 31a, the outer ring 31b arranged coaxially with the inner ring 31a, and between the inner ring 31a and the outer ring 31b, and a plurality of rolling at predetermined positions. Rolling element 31c. Similarly, the second rolling bearing 32 is interposed between the inner ring 32a, the outer ring 32b arranged coaxially with the inner ring 32a, and between the inner ring 32a and the outer ring 32b, and a plurality of rolling elements that roll at predetermined positions. And a moving body 32c.

Also, the inner ring 31a and the outer ring 31b of the first rolling bearing 31 are formed so as to face a concave rolling surface 31d that holds the rolling element 31c in a rollable manner. Similarly, the inner ring 32a and the outer ring 32b of the second rolling bearing 32 are formed so as to face a concave rolling surface 32d that holds the rolling element 32c in a rollable manner.

Next, a method for measuring the torque of the pivot shaft 10 configured as described above will be described with reference to FIGS.

FIG. 3 is a schematic block diagram of the torque measuring device 40 used when measuring the torque of the pivot shaft 10. As shown in FIG. 3, the torque measuring device 40 can rotate the shaft 21 by supporting the pivot shaft 10 and driving the motor 41 while rotating the shaft 21 of the pivot shaft 10 about the shaft center. Connected to the load cell 44, a controller 43 for adjusting the rotational speed of the motor 41, a load cell 44 having a measurement terminal 51 that contacts and separates from the outer peripheral surface 23a of the sleeve 23 of the pivot shaft 10. An amplifier 45, a recorder 46 connected to the amplifier 45, and a numerical processing device 47 that converts the voltage output connected to the recorder 46 and output from the load cell 44 into torque.

FIG. 4 is a perspective view of the load cell 44. The load cell 44 detects the frictional force (distortion of the measurement terminal 51) between the measurement terminal 51 formed of, for example, urethane rubber, and the distal end surface 51a of the measurement terminal 51 and the outer peripheral surface 23a of the sleeve 23, thereby rotating the pivot shaft. And a main body 52 on which a CPU capable of detecting 10 torques is mounted. The measurement terminal 51 is arranged so as to protrude in the vertical direction with respect to the side surface 52 a of the main body 52. The torque of the pivot shaft 10 can be detected by bringing the front end surface 51 a of the measurement terminal 51 into contact with the outer peripheral surface 23 a of the sleeve 23 of the pivot shaft 10.

In addition, it is preferable to employ a material having a Asker C hardness of 10 or more and a Shore A hardness of 40 or less as a constituent material of the measurement terminal 51. If the constituent material of the measurement terminal 51 is a Shore A hardness of 40 or less, as shown in FIG. 23, the output of the load cell 44 can be stabilized even if the pressing force changes. Moreover, it can suppress that the durability of the measurement terminal 51 falls that the constituent material of the measurement terminal 51 is Asker C hardness 10 or more.

5 and 6 are views showing a state in which the torque of the pivot shaft 10 is measured using the load cell 44, FIG. 5 is a plan view, and FIG. 6 is a side view. As shown in FIGS. 5 and 6, the shaft 21 of the pivot shaft 10 placed on the support member 42 (not shown) is rotated about the axis. Then, along with the rotation of the shaft 21, the

inner rings

31a and 32a of the first rolling bearing 31 and the second rolling bearing 32 rotate about the shaft center, and the rotational force is applied to the

outer rings

31b and 32b via the rolling

elements

31c and 32c. The sleeve 23 transmitted and coupled to the

outer rings

31b and 32b rotates about the axis.

Subsequently, the front end surface 51a of the measurement terminal 51 of the load cell 44 is brought into contact with the outer peripheral surface 23a of the sleeve 23 with a predetermined force from a direction perpendicular to the tangential direction of the rotation. Then, a frictional force is generated between the distal end surface 51 a of the measurement terminal 51 and the outer peripheral surface 23 a of the sleeve 23. The measurement terminal 51 is configured to detect this frictional force. Also, the frictional force detection direction (measurement direction) of the measurement terminal 51 is set in a direction substantially parallel to the tangential direction of the rotation. Therefore, noise can be prevented from entering the measurement result.

As a result, a torque waveform as shown in FIG. 7 can be obtained, and a frequency analysis result of the torque waveform as shown in FIG. 8 can be obtained. It can be seen that noise is eliminated and an accurate torque waveform can be obtained as compared with the case where the torque is measured by the conventional method.

Further, as in the present embodiment, when the rotation direction of the shaft 21 is reversed halfway by performing the torque measurement so that the distal end surface 51a of the measurement terminal 51 and the outer peripheral surface 23a of the sleeve 23 are in contact with each other. However, as shown in FIG. 9, a torque waveform can be obtained continuously. The torque hysteresis of the pivot shaft 10 can be measured by reversing the rotation direction of the shaft 21 in this way. Since this torque hysteresis adversely affects the positioning operation of the carriage 11 connected to the pivot shaft 10, the positioning accuracy of the carriage 11 (head gimbal assembly 12) can be improved by measuring this hysteresis in advance. Can do.

According to the present embodiment, the torque of the pivot shaft 10 can be measured simply by bringing the measurement terminal 51 of the load cell 44 into contact with the pivot shaft 10 so as to be pressed with a predetermined force. Therefore, the measured torque value is less affected by the noise of the load cell 44 and can be measured up to a minute torque. Further, since there is no noise caused by the vibration of the load cell 44, it is possible to accurately measure torque up to a high frequency component, and it is possible to accurately measure torque even when the number of rotations during measurement is increased. As a result, the torque measurement time can be shortened. Further, since it is not necessary to attach a torque measuring member (conventional arm member) to the pivot shaft 10, it is possible to prevent the pivot shaft 10 from being damaged, and it is possible to eliminate the work of attaching the torque measuring member. Efficiency can be improved. Since the distance from the rotation center of the pivot shaft 10 to the force measurement point can be shortened, the force to be measured is larger than in the conventional case, and torque measurement with higher resolution can be performed.

Also, by rotating the rotation direction of the shaft 21 halfway, the torque at the time of forward rotation and the torque at the time of reverse rotation of the pivot shaft 10 can be continuously measured. Therefore, the hysteresis of the torque of the pivot shaft 10 can be measured, and the evaluation in accordance with the actual use form of the pivot shaft 10 can be performed.

Further, the torque measuring device 40 has a motor 41 that rotates one of the shaft 21 and the sleeve 23 of the pivot bearing 10 about the axis, and one of the shaft 21 and the sleeve 23 of the pivot bearing 10 that rotates about the axis. A support member 42 that supports the pivot bearing 10, and a measurement terminal 51 that can be brought into contact with and separated from the shaft 21 or the sleeve 23 that rotates about the axis, and the pivoting force is detected by detecting the frictional force of the measurement terminal 51. Since the load cell 44 capable of measuring the torque of the bearing 10 is provided, the measurement terminal 51 of the load cell 44 is merely brought into contact with the pivot bearing 10 placed on the support member 42 so as to be pressed with a predetermined force. The torque of the pivot bearing 10 can be measured with a simple configuration.

It should be noted that the present invention is not limited to the above-described embodiment, and includes those obtained by adding various modifications to the above-described embodiment without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.

For example, in this embodiment, the method for measuring the torque of the pivot shaft of the information recording / reproducing apparatus having a near-field optical head is described as the bearing apparatus. However, the present invention is not limited to this, and the bearing apparatus such as a general HDD or optical disk apparatus, It can be employed in the rotating shaft portion of various devices. Further, it can also be used for torque measurement of a single rolling bearing such as the first rolling bearing 31 and the second rolling bearing 32. When measuring the torque of a single rolling bearing, the torque can be measured by fitting the jig having the above-described shaft function inside the inner ring.

In this embodiment, the torque of the pivot shaft 10 is measured using only one load cell 44. However, as shown in FIG. 10, the torque measurement of the pivot shaft 10 is performed using a plurality of load cells 44. May be performed (in the case of using two load cells 44 in FIG. 10). At this time, the load cells 44 are arranged so that the pressing forces of the load cells 44 against the pivot shaft 10 cancel each other. With this configuration, the load generated by pressing the measurement terminal 51 of the load cell 44 against the pivot shaft 10 can be canceled, so that the torque of the pivot shaft 10 can be measured more accurately.

In the present embodiment, the torque measurement is performed using the measurement terminal 51 made of urethane rubber. However, the measurement terminal 60 is brought into contact with the pivot shaft 10 as shown in FIG. You may comprise so that it may have the front-end | tip part 61 formed with the fluoro rubber etc. and the base end part 62 formed with the urethane rubber etc. which are distribute | arranged between the front-end | tip part 61 and the main-body part 52. FIG. At this time, a material having a hardness higher than that of the base end portion 62 may be used for the tip end portion 61. Thus, by using a high-hardness material with good wear resistance for the tip portion 61, the torque can be measured accurately and the durability of the measurement terminal 60 can be improved. In addition, the torque can be measured more accurately by using a material with low hardness and less side pressure that is applied to the base end portion 62.

In addition, as shown in FIG. 12, the measurement terminal is composed of a core 66 made of metal or plastic at the center of the measurement terminal 65 and urethane rubber or the like so as to cover the core 66. The measuring terminal 65 having the coated material 67 may be employed. By providing the core member 66, for example, when the measurement terminal 65 has to be lengthened, the measurement terminal 65 can be prevented from being bent by its own weight, and the torque measurement accuracy can be prevented from being lowered. Can do.

Alternatively, as shown in FIG. 13, a measuring terminal 70 having a trapezoidal cross section made of urethane rubber may be adopted as the measuring terminal. In this case, what is necessary is just to join the long side side to the main-body part 52, and let the short side side be a contact surface to the pivot axis | shaft 10. FIG. With this configuration, the measurement terminal 70 can be fixed to the load cell 44 with the adhesive force, and the replacement operation can be easily performed when the measurement terminal 70 is replaced in the future due to wear or the like. Since the contact area between the load cell 44 and the measurement terminal 70 is larger than the contact area between the measurement terminal 70 and the pivot shaft 10, the measurement terminal 70 does not fall off the load cell 44 during torque measurement. Furthermore, as shown in FIG. 14, a measurement terminal 72 having a semicircular cross section formed of urethane rubber may be employed as the measurement terminal. In this case, if the semicircular diameter portion is joined to the main body portion 52, substantially the same effect as described above can be obtained.

In the present embodiment, the pivot shaft 10 having the shaft 21 and the sleeve 23 has been described. However, as shown in FIG. 15, the torque measuring method described above is also used for measuring the torque of the pivot shaft 75 having no sleeve 23. May be adopted. In this case, a spacer 76 is provided between the first rolling bearing 31 and the second rolling bearing 32 so that the outer peripheral surfaces of the first rolling bearing 31, the second rolling bearing 32, and the spacer 76 are flush with each other. That's fine. When the torque of the pivot shaft 10 is measured, the torque is applied by pressing the measuring terminal 51 with a predetermined force to one of the outer peripheral surfaces of the first rolling bearing 31, the second rolling bearing 32, and the spacer 76. Can be measured.

In the present embodiment, the measurement terminal 51 is configured such that the frictional force detection direction (measurement direction) is set in a direction substantially parallel to the tangential direction of rotation, but the measurement terminal is set to the twist direction. 77 can also be adopted. In this case, as shown in FIG. 16, an auxiliary member 80 in which an abutting member 78 that abuts on the outer peripheral surface 23 a of the sleeve 23 is disposed at the tip of the measurement terminal 77 is attached. Then, by bringing the contact member 78 into contact with the outer peripheral surface 23a of the sleeve 23, the torque can be measured by the measurement terminal 77 being deformed in the twisting direction.

Further, in the present embodiment, the case where the measurement terminal 51 of the load cell 44 is brought into contact with the outer peripheral surface 23a of the sleeve 23 to measure the torque has been described, but as shown in FIG. A measurement terminal capable of detecting the frictional force may be employed. In this case, the torque is measured by rotating the sleeve 23 instead of the shaft 21 around the axis and bringing the tip end surface 79a of the measuring terminal 79 into contact with the axial end surface 21b of the shaft 21 with a predetermined force. Can do. As shown in FIG. 18, as the measurement terminal 85, a measurement terminal having a substantially cylindrical shape capable of coming into contact with the axial end surface 23c of the sleeve 23 and capable of detecting a frictional force in the torsional direction may be employed. . In this case, the torque can be measured by rotating the shaft 21 about the axis and bringing the tip end surface 85a of the measuring terminal 85 into contact with the axial end surface 23c of the sleeve 23 with a predetermined force. When the sleeve 23 is not provided, the measurement terminal may be brought into contact with the axial end surface of the outer ring of the rolling bearing.

In the present embodiment, the shaft 21 is rotated in the axial direction, and the torque in the rotational direction of the sleeve 23 at that time is measured. However, as shown in FIGS. The motor 41 may be rotated about the axis, and the torque in the rotation direction of the shaft 21 at that time may be measured by the load cell 44. In this case, what is necessary is just to comprise so that the front end surface 51a of the measurement terminal 51 may contact | abut to the outer peripheral surface 21a of the shaft 21. FIG.

Furthermore, in the present embodiment, the case where the shaft 21 is rotated in the axial direction and the torque in the rotational direction of the sleeve 23 at that time is measured has been described. However, as shown in FIG. With the carriage 11 (arm portion 14) attached, torque measurement may be performed by bringing the measurement terminal 51 of the load cell 44 into contact with the tip of the arm portion 14 with a predetermined force.

In this embodiment, the shaft 21 is rotated in the axial direction and the torque in the rotational direction of the sleeve 23 at that time is measured. As shown in FIG. 22, the measurement direction of the measurement terminal 51 is measured. May be attached to the main body 52 and the torque measurement may be performed by bringing the measurement terminal 51 and the pivot bearing 10 into contact with each other so as to match the measurement direction.

DESCRIPTION OF SYMBOLS 10 ... Pivot shaft (rolling bearing apparatus) 21 ... Shaft 21a ... Outer peripheral surface 21b ... Axial end surface 23 ... Sleeve 23a ... Outer peripheral surface 31 ... First rolling bearing (rolling bearing) 31a ... Inner ring 31b ... Outer ring 31c ... Rolling element 32 ... Second rolling bearing (rolling bearing) 32a ... inner ring 32b ... outer ring 32c ... rolling element 41 ... motor 42 ... support member 44 ... load cell 51 ... measurement terminal 51a ... tip face (end face) 52 ... main part (load cell main part) 60 ... Measurement terminal 61 ... distal end 62 ... proximal end 76 ... spacer

Claims

A shaft formed in a cylindrical shape;
A cylindrical sleeve disposed coaxially with the shaft at a predetermined interval from the outer peripheral surface of the shaft;
A rolling bearing device torque measuring method comprising: a rolling bearing disposed between the shaft and the sleeve, an inner ring fixed to the shaft, and an outer ring fixed to the sleeve,
Using a load cell with a measuring terminal that can detect torque,
While rotating one of the shaft or the sleeve of the rolling bearing device around the axis, press the measurement terminal to the other with a predetermined force,
A torque measuring method for a rolling bearing device, wherein the torque of the rolling bearing device is measured by detecting a frictional force of the measuring terminal.
A shaft formed in a cylindrical shape;
A plurality of rolling bearings having an inner ring fixed to the outer peripheral surface of the shaft;
A spacer disposed between the outer rings of the adjacent rolling bearings, and a torque measuring method for a rolling bearing device comprising:
Using a load cell with a measuring terminal that can detect torque,
While rotating one of the shaft or the outer ring and the spacer of the rolling bearing device around the axis, press the measurement terminal to the other with a predetermined force,
A torque measuring method for a rolling bearing device, wherein the torque of the rolling bearing device is measured by detecting a frictional force of the measuring terminal.
In the rolling bearing device according to claim 1 or 2,
A torque measuring method for a rolling bearing device further provided with a swing arm configured to be fitted to the sleeve or the outer ring and pivotable about an axis,
While rotating one of the shaft or the sleeve, the outer ring and the spacer of the rolling bearing device around the axis, press the measurement terminal to the other with a predetermined force,
A torque measuring method for a rolling bearing device, wherein the torque of the rolling bearing device is measured by detecting a frictional force of the measuring terminal.
In a state where the one is rotated about the axis, the measurement terminal is brought into contact with the other outer peripheral surface from a direction perpendicular to the tangential direction of the rotation so as to press the measurement terminal with a predetermined force. The torque measuring method for a rolling bearing device according to any one of claims 1 to 3, wherein the torque of the rolling bearing device is measured.
The rolling bearing device by contacting the measurement terminal from the axial center direction to the other axial end surface so as to press the measurement terminal with a predetermined force in a state where the one is rotated about the axis. The torque measuring method for a rolling bearing device according to any one of claims 1 to 3, wherein the torque is measured.
The measurement terminal includes a distal end portion that comes into contact with the rolling bearing device, and a proximal end portion disposed between the distal end portion and the load cell main body portion,
The torque measurement method for a rolling bearing device according to any one of claims 1 to 5, wherein a material having a hardness higher than that of the base end portion is used for the tip end portion.
The method for measuring torque of a rolling bearing device according to any one of claims 1 to 6, wherein the constituent material of the measuring terminal has an Asker C hardness of 10 or more and a Shore A hardness of 40 or less.
Using a plurality of the load cells,
8. The torque of the rolling bearing device is measured by arranging the plurality of load cells so as to cancel each other's pressing force of the plurality of load cells against the rolling bearing device. Method for measuring torque of a rolling bearing device.
With the measurement terminal in contact with the one or the other,
The rolling bearing device according to any one of claims 1 to 8, wherein the torque at the time of forward rotation and the torque at the time of reverse rotation of the rolling bearing device are continuously measured by reversing the rotation direction. Torque measurement method.
A motor for rotating the one of the rolling bearing devices according to any one of claims 1 to 9 about an axis;
A support member that supports the rolling bearing device in a state in which the one is rotated around an axis;
A rolling cell having a measuring terminal capable of coming into contact with and separating from the other, and a load cell capable of measuring the torque of the rolling bearing device by detecting a frictional force of the measuring terminal. Torque measuring device for bearing devices.
A substantially cylindrical inner ring,
A substantially cylindrical outer ring disposed coaxially with the inner ring at a predetermined interval from the outer peripheral surface of the inner ring;
A rolling bearing torque measuring method comprising: a rolling element interposed between the inner ring and the outer ring,
Using a load cell with a measuring terminal that can detect torque,
While rotating one of the inner ring or the outer ring of the rolling bearing around the axis, press the measurement terminal to the other with a predetermined force,
A method for measuring a torque of a rolling bearing, wherein the torque of the rolling bearing is measured by detecting a frictional force of the measuring terminal.
With the one rotating about the axis, the measurement terminal is brought into contact with the other peripheral surface from a direction perpendicular to the tangential direction of the rotation so as to press the measurement terminal with a predetermined force. The torque of the rolling bearing according to claim 11, wherein the torque of the rolling bearing is measured.
In a state where the one is rotated about the shaft center, the measuring terminal is brought into contact with the other axial end surface from the axial center direction so as to press the measuring terminal with a predetermined force. Torque is measured, The torque measuring method of the rolling bearing of Claim 11 or 12 characterized by the above-mentioned.
The measurement terminal includes a distal end portion that comes into contact with the rolling bearing device, and a proximal end portion disposed between the distal end portion and the load cell main body portion,
The rolling bearing torque measurement method according to any one of claims 11 to 13, wherein a material having a hardness higher than that of the base end portion is used for the tip end portion.
The method for measuring torque of a rolling bearing according to any one of claims 11 to 14, wherein the constituent material of the measurement terminal is an Asker C hardness of 10 or more and a Shore A hardness of 40 or less.
Using a plurality of the load cells,
The rolling device according to any one of claims 11 to 15, wherein the torque of the rolling bearing is measured by arranging the plurality of load cells so as to cancel each other's pressing force of the plurality of load cells against the rolling bearing. Bearing torque measurement method.
With the measurement terminal in contact with the one or the other,
The torque measurement of a rolling bearing according to any one of claims 11 to 16, wherein the torque at the time of forward rotation and the torque at the time of reverse rotation of the rolling bearing are continuously measured by reversing the rotation direction. Method.
A motor that rotates the one of the rolling bearings according to any one of claims 11 to 17 about an axis;
A support member for supporting the rolling bearing in a state in which the one is rotated around an axis;
A rolling bearing comprising: a measuring terminal capable of coming into contact with and separating from the other; and a load cell capable of measuring a torque of the rolling bearing by detecting a frictional force of the measuring terminal. Torque measurement device.