JP3896803B2 - Preload application method and preload application device for double row rolling bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
A preload applying method and a preload applying device for a double row rolling bearing device according to the present invention include, for example, a flexible disk drive device (FDD), a hard disk drive device (HDD), an optical disk storage device, a laser beam printer (LBP), a tape streamer, and a video. A spindle motor incorporated in a tape recorder (VTR) or the like, a motor for driving a cooling fan of an IC (integrated circuit), or a base end of a swing arm of an HDD, etc. It is used to keep the rotational resistance (loss torque) associated with preloading of double row rolling bearing devices such as row ball bearing devices within an appropriate range.
[0002]
[Prior art]
FIGS. 5-6 show what was described in Unexamined-Japanese-Patent No. 6-221326 as an example of the double row ball bearing apparatus incorporated in various precision rotation parts as mentioned above, and supporting this rotation part. . The double-row ball bearing device 1 described in this publication rotates a shaft 2 constituting an inner member and an outer cylinder 3 constituting an outer member arranged concentrically with each other by a pair of ball bearings 4 and 4. Combining freely. Each of these ball bearings 4, 4 has an inner ring 6 that is a race member constituting an inner member, and a deep groove type outer ring raceway 7 is formed on the inner peripheral surface. A plurality of balls 10, 10 each provided as a rolling element are provided between the outer ring 8 constituting the outer member and the inner ring raceway 5 and the outer ring raceway 7 so as to be able to roll while being held by a cage 9. It consists of. The outer rings 8 and 8 constituting the ball bearings 4 and 4 are fitted and fixed to the inner peripheral surface of the outer cylinder 3, respectively, and the inner rings 6 and 6 are respectively fixed to the outer peripheral surface of the shaft 2. The outer fitting is fixed.
[0003]
When the double row ball bearing device 1 configured as described above is used, the inner rings 6 and 6 are connected to each other in order to ensure the rigidity and rotational accuracy required for the double row ball bearing device 1. By pressing in the approaching direction, a predetermined preload is applied to the balls 10 and 10. In the case of the illustrated example, the preloading operation to each of the balls 10 and 10 is performed as follows. First, one end (the left end in FIG. 5) of the shaft 2 is held by the holder 11, and one end side portion of the thread 12 is wound around and fixed to the outer peripheral surface of the outer cylinder 3. Then, the shaft 2 is rotated by the holder 11, and the rotational resistance (loss torque) of the outer cylinder 3 that is going to rotate with the shaft 2 is measured by a load sensor 13 attached to the other end of the thread 12. Further, while measuring the loss torque in this way, the end surface of one inner ring 6 (on the right side in FIG. 5) is pressed by the pushing arm 14 so that the inner ring 6 on the other side (on the left side in FIG. 5) is pressed. Move toward the inner ring 6. Then, in a state where the loss torque substantially coincides with a preset set value, the pushing arm 14 is stopped, and the movement work of the one inner ring 6 is finished.
[0004]
It has been conventionally known that there is a certain relationship between the loss torque and the preload amount of the double row ball bearing device 1 as described above. Therefore, if the loss torque of the double row ball bearing device having the same configuration as that of the double row ball bearing device 1 to which the predetermined preload is to be applied and the appropriate preload is applied is measured in advance, one side as described above. An appropriate preload can be applied to each of the balls 10 and 10 in a state where the movement work of the inner ring 6 is completed. Each of the inner rings 6 and 6 is fixed to the shaft 2 by adhesive fixing or an interference fit having a sufficient fitting strength (a strength that does not move due to a reaction force applied with a preload). When the inner rings 6 and 6 are bonded and fixed to the shaft 2, the one inner ring 6 is continuously pressed by the pushing arm 14 with a load corresponding to the appropriate preload until the adhesive is solidified. .
[0005]
The use of the resonance frequency of this double-row ball bearing device in order to give a desired preload to the double-row ball bearing device has also been known in the past as described in JP-A-6-221326. Furthermore, it is actually implemented industrially. That is, it is known that there is a close relationship between the preload and the resonance frequency of a double row rolling bearing device such as a double row ball bearing device. Therefore, the reference frequency is obtained by measuring in advance the resonance frequency of the double row rolling bearing device to which a desired preload is applied. When applying a preload to another double-row rolling bearing device, the inner ring is moved in the axial direction while measuring the resonance frequency of the double-row rolling bearing device, and the resonance frequency matches the reference frequency. If the axial movement of the inner ring is stopped in this state, a desired preload can be applied to the other double row rolling bearing device.
[0006]
[Problems to be solved by the invention]
In the case of the preload applying method and the preload applying device for the double row ball bearing device described in the above-mentioned Japanese Patent Application Laid-Open No. Hei 6-221326, there are the following points to be improved.
First, in the case of the method of measuring the loss torque as shown in FIG. 6, for each double row ball bearing device 1 to which preload is applied, a thread 12 is formed on the outer peripheral surface of the outer cylinder 3 constituting the double row ball bearing device 1. It is necessary to wind the one end side part of. However, since the double-row ball bearing device 1 incorporated in the HDD or the like is small, the operation of winding the one end portion of the thread 12 around the outer peripheral surface of the outer cylinder 3 as described above is troublesome. For this reason, it is difficult to easily perform a desired preload application work, and it is difficult to increase the efficiency of the preload application work, particularly when a large number of double row ball bearing devices 1 are preloaded.
[0007]
Further, in the case of the conventional preload applying method and preload applying apparatus as described above, in order to rotate the shaft 2 and the inner rings 6, 6 which are inner members, the holder 11 for holding the shaft 2, The pushing arm 14 for pressing the inner ring 6 also needs to be rotated together with the shaft 2 and the inner rings 6 and 6. This complicates the structure of the device that includes the holder 11 and the push-in arm 14.
[0008]
On the other hand, in the case of the method for obtaining the preload of the double row rolling bearing device by measuring the resonance frequency of the double row rolling bearing device, the double row rolling bearing device in which the preload is easily applied and the preload is applied. However, the accuracy of preloading is inferior to that based on loss torque measurement. In particular, in recent years, small double-row rolling bearing units such as those incorporated in the rotation support parts of information equipment and audio equipment can contain the amount of loss torque accompanying preload within the appropriate range rather than the preload value itself. It has been demanded. In such a case, it is preferable to directly measure the loss torque when preload is applied to the double row rolling bearing unit.
The preload applying method and the preload applying device for the double row rolling bearing device of the present invention are invented in view of the above-described circumstances.
[0009]
[Means for Solving the Problems]
The double-row rolling bearing device such as a double-row ball bearing device that applies a desired preload by the preload applying method and the preload applying device of the double-row rolling bearing device of the present invention is, for example, the double-row shown in FIGS. Similar to the double-row rolling bearing device such as the ball bearing device 1 or the like, the inner member, a pair of inner ring raceways provided on the outer peripheral surface of the inner member and spaced apart from each other, and the inner member are concentric around the inner member. A plurality of outer members disposed between the outer ring raceway and the inner ring raceways, and a pair of outer ring raceways provided at positions facing the inner raceways on the inner peripheral surface of the outer member. A rolling element provided so as to freely roll. Then, the rolling members having the inner ring raceway formed on the outer peripheral surface thereof to constitute the inner member are moved in the axial direction so as to narrow the interval between the inner ring raceway and the other inner ring raceway, thereby each rolling element. It is configured to give a preload to.
[0010]
When applying a desired preload to each of the rolling elements constituting such a double row rolling bearing device, in the preload applying method according to claim 1, the loss torque of the double row rolling bearing device suitable for the desired preload. Is continuously applied to the outer member in a non-contact state. The track member is moved in the axial direction while rotating the outer member based on the drive torque, and the loss torque and the drive torque are balanced and the rotation of the outer member is stopped. End (stop) the moving work in the axial direction.
[0011]
Further, in the preload applying method according to claim 2, a predetermined driving torque exceeding the loss torque of the double row rolling bearing device corresponding to a desired preload is continuously applied to the outer member in a non-contact state. To do. Then, the driving member is moved in the axial direction while rotating the outer member based on the driving torque, and the driving torque is a rotating speed corresponding to a loss torque corresponding to the desired preload. The moving work in the axial direction of the track member is terminated (stopped) at a rotational speed corresponding to the torque difference obtained by reducing the loss torque .
[0012]
In this case, preferably, as described in claim 3, the double row rolling bearing device is vibrated and the race member is moved in the axial direction while detecting the vibration of the outer member of the double row rolling bearing device . Then, after the peak of the resonance frequency of the outer member appears, the speed of moving the track member in the axial direction is reduced. During the measurement of the resonance frequency, it is not always necessary to rotate the outer member by the driving means. If the resonance frequency can be measured even when the outer member is rotating, the resonance frequency is measured while rotating the outer member. On the other hand, if it is difficult to measure the resonance frequency while the outer member is rotating, the outer member remains stopped while the resonance frequency is being measured. However, in order to set the loss torque of the double row rolling bearing device to a value commensurate with the desired preload, at the stage of monitoring the rotation state of the outer member, the driving torque is continuously applied to the outer member in a non-contact state. By applying continuously, the track member is moved in the axial direction while rotating the outer member.
[0013]
According to a fourth aspect of the present invention, there is provided a preload applying device for a double row rolling bearing device in which the inner member is held in a stationary state, and the track member is moved in the axial direction to move the track member in the axial direction. An axial force applying means for applying a force, a driving means for continuously rotating and driving the outer member in a non-contact state, and a rotation monitoring device for observing the rotating state of the outer member. . And based on the rotation state of the said outer member observed by this rotation monitoring apparatus, the operation | work which moves the said outer member to an axial direction by the said axial force provision means is stopped.
Preferably, as described in claim 5, vibration means for vibrating the double row rolling bearing device via the inner member and the race member, and vibration of the outer member based on the vibration by the vibration means are provided. A vibration sensor to detect, and an arithmetic unit for obtaining a resonance frequency of the double row rolling bearing device by a detection signal of the vibration sensor. Then, the double row rolling bearing device is vibrated by the vibration means, and the race member is moved in the axial direction while detecting the vibration of the outer member of the double row rolling bearing device, and the resonance frequency peak of the outer member is detected. After appearing, the speed of moving the track member in the axial direction is reduced.
Further, as the driving means, as described in claim 6, a nozzle that blows pressure fluid on the outer peripheral surface of the outer member in a direction inclined with respect to the diameter direction of the outer member, or in claim 7. As described above, an electromagnetic induction coil that is loosely fitted around the outer member made of a conductive material is used.
[0014]
[Action]
According to the preload application method and the preload application device of the double row rolling bearing device of the present invention configured as described above, the magnitude of the loss torque associated with the application of the preload, not the value of the preload itself (corresponding decrease in rotational speed) Therefore, it is possible to easily carry out the work of accurately placing the loss torque accompanying the preload application of the double row rolling bearing device within an appropriate range.
Further, as described in claim 3 and claim 5, when used together with the preload measurement by the resonance frequency measurement, the preload application work for obtaining the desired loss torque by quickly moving the track member in the initial stage is performed. Efficiency can be improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a first example of an embodiment of the present invention corresponding to claims 1 and 3 to 6. A double-row ball bearing device 1a, which is a kind of double-row rolling bearing device in which preload is applied by the preload applying method and preload applying device of the double-row rolling bearing device of the present invention, constitutes inner members arranged concentrically with each other. The inner cylinder 15 and the outer cylinder 3 constituting the outer member are combined in a freely rotatable manner by a pair of ball bearings 4 and 4. Each of these ball bearings 4, 4 has an inner ring 6 that is a race member constituting an inner member, and a deep groove type outer ring raceway 7 is formed on the inner peripheral surface. A plurality of balls 10, 10 each provided as a rolling element are provided between the outer ring 8 constituting the outer member and the inner ring raceway 5 and the outer ring raceway 7 so as to be able to roll while being held by a cage 9. It consists of. The outer rings 8 and 8 constituting the ball bearings 4 and 4 are fitted and fixed to the inner peripheral surface of the outer cylinder 3, respectively, and the inner rings 6 and 6 are respectively connected to the outer periphery of the inner cylinder 15. It is fixed on the surface. When the present invention is carried out, only one inner ring raceway 5 of the pair of inner ring raceways 5, 5 formed on the outer peripheral face of the inner member is formed on the outer peripheral face of the inner ring 6, and the other inner ring raceway 5. Can also be formed directly on the outer peripheral surface of the inner cylinder 15. Further, the pair of outer ring raceways 7 and 7 can be directly formed on the inner peripheral surface of the outer cylinder 3. Furthermore, the present invention is not limited to the double-row ball bearing device as long as it is a double-row rolling bearing device that applies preload, and can also be implemented by a double-row tapered roller bearing unit.
[0016]
The hollow cylindrical inner cylinder 15 which is an inner member constituting the double row ball bearing device 1a to which the preload is applied is held in a stationary state by a holder 11a which is a holding means. Further, an axial force is applied to the upper end surface of one inner ring 6 (upper side in FIG. 1) of the pair of inner rings 6 and 6, each of which is a track member that constitutes an inner member, and is fitted on the inner cylinder 15. The front end surface of the push-in arm 14a, which is an applying means, is abutted. Then, the upper arm surface of the one inner ring 6 is pressed by the pushing arm 14a, and the one inner ring 6 is moved toward the other inner ring 6 (downward in FIG. 1), whereby the double row ball bearing device 1a is moved. A preload can be freely applied to a plurality of balls 10 and 10 constituting the same.
[0017]
The holder 11a is supported in the vertical direction on the upper surface of a support base (not shown) via a load sensor 16 and a piezoelectric element 17a serving as a vibration means. On the other hand, the pushing arm 14a is supported on the lower surface of the head 18 of the feeding device concentrically with the holding tool 11a via a piezoelectric element 17b which is also a vibration means. The pair of piezoelectric elements 17a and 17b are of the same specification, and are mutually different in phase by 180 degrees. Therefore, when one piezoelectric element 17a (or 17b) pushes the double row ball bearing device 1a for a predetermined stroke, the other piezoelectric element 17b (or 17a) retracts by this stroke. Therefore, the vibration in the axial direction does not act as a force that increases the preload. Such a pair of piezoelectric elements 17a, 17b finely reciprocates (vibrates) the double-row ball bearing device 1a in the vertical direction with energization. In order to make it possible to measure the resonance frequency of the double-row ball bearing device 1a that is vibrated in this way, the tip of the probe 20 of the vibration sensor 19 is brought into contact with the upper end surface of the outer cylinder 3. . The detection signal of the vibration sensor 19 is sent to a calculator (not shown), and the calculator can freely calculate the resonance frequency of the double row ball bearing device 1a.
[0018]
Further, a nozzle 21 constituting a driving means is disposed in the vicinity of the outer peripheral surface of the outer cylinder 3 which is an outer member constituting the double row ball bearing device 1a. As shown in FIG. 2, the nozzle 21 is disposed in a direction inclined with respect to the diameter direction of the outer cylinder 3, and pressure fluid such as compressed air is supplied to the outer peripheral surface of the outer cylinder 3. 3 is sprayed in a direction inclined with respect to the diameter direction of 3 (an intermediate direction between the diameter direction and the tangential direction). And the driving torque of a rotation direction is provided to the said outer cylinder 3 based on the dynamic pressure of the said pressure fluid. In the case of this example, the double-row ball bearing device in a state where the drive torque to be applied to the outer cylinder 3 based on the spraying of the pressure fluid is applied to the double-row ball bearing device 1a. It is made to correspond to the loss torque of 1a. The magnitude of the driving torque can be adjusted by changing the inclination angle of the nozzle 21 and the flow rate and flow rate of the pressure fluid blown from the nozzle 21.
[0019]
When preload is applied to each of the balls 10 and 10 constituting the double row ball bearing device 1a while suppressing the loss torque of the double row ball bearing device 1a to a predetermined value or less, a pressure fluid is blown out from the nozzle 21. Then, the outer cylinder 3 is rotated. The one inner ring 6 is moved toward the other inner ring 6 by the pushing arm 14a while the double row ball bearing device 1a is vibrated by the pair of piezoelectric elements 17a and 17b. The speed of this movement is relatively high in the initial stage of the preload application operation. As this movement proceeds, the rolling surfaces of the plurality of balls 10 and 10 constituting the double-row ball bearing device 1a come into contact with the inner ring raceways 5 and 5 and the outer ring raceways 7 and 7. As a result, a peak of the resonance frequency appears (appears). If this peak appears, the moving speed of the pushing arm 14a is slowed down. In this state, the outer cylinder 3 is still rotated by the pressure fluid blown from the nozzle 21.
[0020]
Then, while the one inner ring 6 is slowly moved toward the other inner ring 6 by the pushing arm 14a, the rotation state of the outer cylinder 3 is observed by a rotation monitoring device incorporating a CCD camera and an image processing device. Then, with the rotation of the outer cylinder 3 stopped, the pushing operation of the one inner ring 6 by the pushing arm 14a is finished. As described above, the driving torque generated by the pressure fluid blown from the nozzle 21 matches the desired loss torque, so that the rotation of the outer cylinder 3 stops at the moment when the one inner ring 6 is moved slowly. If the movement is stopped, the loss torque of the double row ball bearing device 1a can be set to the desired value.
[0021]
When the present invention is carried out, the sliding friction of the contact portion between the probe 20 of the vibration sensor 19 and the end surface of the outer cylinder 3 is very small. The value can be set to such a level that there is no practical problem. Rather, it may be appropriate from the aspect of setting an appropriate loss torque to ignore this value instead of suppressing the value of the sliding friction slightly. That is, assuming that the driving torque and the desired loss torque are matched, and that the movement of the one inner ring 6 is stopped at the moment when the rotation of the outer cylinder 3 stops (without any time delay). The actually set loss torque is reduced by an amount corresponding to the sliding friction value. However, since it is impossible to completely eliminate the time delay from the moment when the rotation of the outer cylinder 3 stops until the movement of the one inner ring 6 stops, the sliding friction as described above. By ignoring this value instead of keeping the value slightly, the time delay can be compensated. Furthermore, instead of making the vibration of the outer cylinder 3 freely measurable by a non-contact type vibrometer such as a laser Doppler type, the driving torque is slightly smaller than the loss torque (by an amount corresponding to the time delay). It can be made smaller.
[0022]
Next, FIGS. 3 to 4 show a second example of the embodiment of the invention corresponding to claims 1, 3, 4, 5 and 7. In the case of this example, the electromagnetic induction coil 22 is used as drive means for rotationally driving the outer cylinder 3 constituting the double row ball bearing device 1a in a non-contact state. When performing the preload application operation to the double row ball bearing device 1a, the electromagnetic induction coil 22 is loosely placed on the outer cylinder 3 made of a conductive material such as stainless steel (with a radial gap interposed). Fits in). Then, by applying a set voltage to the electromagnetic induction coil 22 and applying a rotating magnetic field, the outer cylinder 3 is rotated with a predetermined driving torque (corresponding to a loss torque to be set in the double row ball bearing device 1a). Meanwhile, a preload application operation is performed in which one inner ring 6 is pressed by the pushing arm 14a. Since the configuration and operation except that the driving means is changed from the nozzle 21 (FIGS. 1 and 2) to the electromagnetic induction coil 22 are the same as in the case of the first example described above, the same parts are denoted by the same reference numerals and overlapped. Description to be omitted is omitted.
[0023]
In the above description, when a predetermined preload is applied to the double row ball bearing device 1a, and the loss torque of the double row ball bearing device 1a matches the predetermined preload, the outer cylinder 3 The case where the stop of the first inner ring 6 is detected and the movement of the one inner ring 6 is terminated has been described. On the other hand, as described in claim 2, the driving torque is made slightly larger than the loss torque, and it is detected that the rotational speed of the outer cylinder 3 is reduced due to an increase in loss torque based on preload application, The movement of one inner ring 6 can also be terminated. That is, in this case, by applying a predetermined driving torque exceeding the loss torque of the double-row ball bearing device 1a that matches a desired preload to the outer cylinder 3 that is an outer member in a non-contact state, the outer cylinder The one inner ring 6 that is a track member is moved in the axial direction while rotating 3. Then, in the state where the rotational speed of the outer cylinder 3 has reached the rotational speed corresponding to the loss torque corresponding to the desired preload, that is, the rotational speed corresponding to the torque difference obtained by subtracting the loss torque from the drive torque , The movement work regarding the axial direction of the inner ring 6 is completed. In this way, by detecting a decrease in the rotational speed of the outer cylinder 3 due to loss torque, the rotational state detection range can be increased compared to the case where the stop of the outer cylinder 3 is detected. The loss torque of the device 1a can be managed more strictly.
[0024]
【The invention's effect】
Since the preload applying method and the preload applying device for the double row rolling bearing device according to the present invention are configured and act as described above, the preload applying operation can be performed easily and the loss torque is accurately regulated. As a result, when preload is applied to a large number of double row rolling bearing devices, the efficiency of the preload application work can be improved. Also, the structure of the holding means for holding the inner member and the axial force applying means for applying the axial force to the track member can be simplified, and the equipment cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view showing a first example of an embodiment of the present invention with a part thereof cut away.
FIG. 2 is a view from above of FIG.
FIG. 3 is a side view showing a second example of the embodiment of the invention with a part thereof cut away;
4 is a view from above of FIG. 3, with a part omitted.
FIG. 5 is a half sectional view showing an example of the prior art.
6 is a view from the side of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1a Double row ball bearing apparatus 2 Shaft 3 Outer cylinder 4 Ball bearing 5 Inner ring raceway 6 Inner ring 7 Outer ring raceway 8 Outer ring 9 Cage 10 Ball 11, 11a Holder 12 Thread 13 Load sensor 14, 14a Push arm 15 Inner cylinder 16 Load sensors 17a and 17b Piezoelectric element 18 Head 19 Vibration sensor 20 Measuring element 21 Nozzle 22 Electromagnetic induction coil

Claims (7)

An inner member, a pair of inner ring raceways spaced apart from each other on the outer peripheral surface of the inner member, an outer member disposed concentrically with the inner member around the inner member, and an inner peripheral surface of the outer member And a pair of outer ring raceways provided at positions facing each of the inner ring raceways, and a plurality of rolling elements provided in a freely rotatable manner between each of the outer ring raceways and the respective inner ring raceways. With respect to the rolling bearing device, the above-described inner member is formed by moving the race member having an inner ring raceway on the outer peripheral surface thereof in the axial direction in a direction in which the interval between the inner ring raceway and the other inner ring raceway is reduced. When a desired preload is applied to each rolling element, a driving torque corresponding to the loss torque of the double row rolling bearing device corresponding to the desired preload is continuously applied to the outer member in a non-contact state. By doing this outside While rotating the member to move the raceway member in the axial direction, and terminates the mobile work in the axial direction of the raceway member in a state where the rotation of the outer member and the torque loss and the drive torque is balanced stops, double A preloading method for a row rolling bearing device. An inner member, a pair of inner ring raceways spaced apart from each other on the outer peripheral surface of the inner member, an outer member disposed concentrically with the inner member around the inner member, and an inner peripheral surface of the outer member And a pair of outer ring raceways provided at positions facing each of the inner ring raceways, and a plurality of rolling elements provided in a freely rotatable manner between each of the outer ring raceways and the respective inner ring raceways. With respect to the rolling bearing device, the above-described inner member is formed by moving the race member having an inner ring raceway on the outer peripheral surface thereof in the axial direction in a direction in which the interval between the inner ring raceway and the other inner ring raceway is reduced. When a desired preload is applied to each rolling element, a predetermined driving torque exceeding the loss torque of the double row rolling bearing device that matches the desired preload is continuously and continuously applied to the outer member in a non-contact state. By giving While rotating the outer member to move the raceway member in the axial direction, the rotational speed of the outer member is a rotational speed corresponding to the loss torque commensurate with the desired preload, the torque difference obtained by subtracting the loss torque from the driving torque A preload application method for a double row rolling bearing device, wherein the moving operation in the axial direction of the raceway member is terminated in a state where the corresponding rotational speed is reached. After the double row rolling bearing device is vibrated and the race member is moved in the axial direction while detecting the vibration of the outer member of the double row rolling bearing device , the peak of the resonance frequency of the outer member appears. The method for applying a preload to a double row rolling bearing device according to any one of claims 1 to 2, wherein a speed at which the shaft is moved in the axial direction is reduced. A preload application device for carrying out the preload application method for a double row rolling bearing device according to any one of claims 1 to 3, comprising a holding means for holding the inner member in a stationary state, and a race member. In order to move in the axial direction, an axial force applying means for applying an axial force to the track member, a driving means for continuously rotating and driving the outer member in a non-contact state, and an outer member A rotation monitoring device for observing the rotation state, and based on the rotation state of the outer member observed by the rotation monitoring device, the operation of moving the outer member in the axial direction by the axial force applying means is stopped. A preload applying device for a double row rolling bearing device. The vibration means for vibrating the double row rolling bearing device via the inner member and the race member, the vibration sensor for detecting the vibration of the outer member based on the vibration by the vibration means, and the detection signal of the vibration sensor And a computing unit for obtaining a resonance frequency of the double row rolling bearing device, wherein the double row rolling bearing device is vibrated by the vibration means and the race member is detected while detecting the vibration of the outer member of the double row rolling bearing device. The preload imparting device for a double row rolling bearing device according to claim 4, wherein after moving in the axial direction and the peak of the resonance frequency of the outer member appears, the speed at which the race member is moved in the axial direction is reduced .   The preloading of the double row rolling bearing device according to claim 4 or 5, wherein the driving means is a nozzle that blows the pressure fluid to the outer peripheral surface of the outer member in a direction inclined with respect to the diameter direction of the outer member. apparatus.   The preload applying device for a double row rolling bearing device according to claim 4 or 5, wherein the driving means is an electromagnetic induction coil that is loosely fitted around the outer member made of a conductive material.

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