JP5882097B2 - Rolling bearing device manufacturing apparatus and rolling bearing device manufacturing method - Google Patents

Description

  The present invention relates to a rolling bearing device manufacturing apparatus and a rolling bearing device manufacturing method.

  2. Description of the Related Art Conventionally, a manufacturing method for manufacturing a rolling bearing device used in a magnetic recording device (HDD) or the like is known (for example, see Patent Document 1). In the manufacturing method of the rolling bearing device described in Patent Document 1, the inner ring and the shaft (shaft) are fixed by press-fitting, and the inner ring is pushed into the shaft while measuring the resonance frequency, so that the resonance frequency becomes constant. So that preload is applied.

Japanese Patent Laid-Open No. 2003-239956

  However, when a preload is applied to the rolling bearing device so that the resonance frequency is constant as in the conventional manufacturing method, the resonance frequency is constant, but due to individual differences in the radial play of the rolling bearing and the curvature of the raceway. There is a problem that the torque varies.

  This invention is made | formed in view of the situation mentioned above, Comprising: It aims at providing the manufacturing apparatus and manufacturing method which manufacture the rolling bearing apparatus which reduced the dispersion | variation in torque.

In order to achieve the above object, the present invention provides the following means.
The present invention includes two rolling bearings having an inner ring and an outer ring that are coaxially disposed and coaxially arranged at an axial interval, and are press-fitted into the inner rings of the two rolling bearings. A rotation drive unit that rotates the shaft member of the rolling bearing device assembly including the shaft member fitted in the shaft, and pushes the outer rings of the two rolling bearings close to each other in the axial direction. a pushing portion for positioning the outer ring, and a torque measuring unit for the outer ring relative to the inner ring by rotation of the shaft member is to measure the torque transmitted from the outer ring when rotated to the inner ring, the torque measuring unit as the torque to be measured is substantially constant within a predetermined tolerance by, providing an apparatus for manufacturing a rolling bearing device comprising a control unit for controlling the pushing portion.

According to the present invention, the outer ring of the rolling bearing device assembly is pushed and positioned in a direction close to the axial direction by the pushing portion so that the outer ring and the shaft member are in a state in which a preload is applied to the rolling bearing. A press-fitted and fixed rolling bearing device is manufactured.

In this case, the rotary drive unit, the shaft member when rotated about the axis, the outer ring press-fitted to the shaft member is rotated around the axis relative to the inner ring, the torque to the inner ring from the outer ring is transmitted. Therefore, while applying a preload to the rolling bearing by the pushing portion, the torque outer ring is transmitted from the inner ring when rotated in the outer ring was measured by the torque measuring unit with respect to the inner wheel, the torque is within a predetermined tolerance By controlling the pushing portion by the control unit so as to be substantially constant, a rolling bearing device with reduced torque variation can be manufactured.

  In the above-mentioned invention, the shaft member may be supported, and a support portion that is rotatable about the shaft by the rotation driving portion, and a slip suppression portion that suppresses slippage between the support portion and the shaft member may be provided. Good.

By comprising in this way, the shaft member supported by the support part is rotated around an axis with a support part by the rotational drive part in the state in which the slip with the support part was suppressed by the slip suppression part. Therefore, the shaft member can be rotated at a constant rotation speed determined by the rotation drive unit. Accordingly, it is possible to prevent the torque transmitted from the outer ring to the inner ring from changing due to slippage and the torque transmitted from the outer ring to the inner ring, and to measure the accurate torque by the torque measuring unit.

In the aspect described above, the pushing portion may be provided rotatably with the outer ring to said axis together with the outer ring while pushing.
By comprising in this way, a pushing part can be rotated synchronizing with a support part and a shaft member. Therefore, fluctuations in torque transmitted from the outer ring to the inner ring due to slippage between the pushing portion and the inner ring can be suppressed, and accurate torque can be measured by the torque measuring unit.

Moreover, in the said invention, it is good also as providing the rotation transmission mechanism which synchronizes the rotation of the said support part around the said axis | shaft, and the rotation of the said pushing part around the said axis | shaft.
By comprising in this way, the slip between a pushing part and an inner ring | wheel can be suppressed.

Moreover, in the said invention, it is good also as providing the pressing part which presses the said shaft member to the said axial direction with respect to the said support part.
With this configuration, even when the outer ring is not pushed by the pushing portion or when the pressure between the pushing portion and the outer ring is low, the pressing member pushes the shaft member of the rolling bearing device assembly against the support portion. The slip between the shaft member and the support portion can be prevented. Therefore, it is possible to prevent the torque transmitted from the outer ring to the inner ring from decreasing due to the change in the rotation speed of the shaft member due to the slip. As a result, it is possible to measure an accurate torque and prevent excessive preload.

  In the above invention, the first drive unit that moves the pushing portion forward and backward in the axial direction with a predetermined first displacement amount, and larger than the first displacement amount of the first drive unit and smaller than the total displacement amount. It is good also as providing the 2nd drive part which can advance / retreat the said 1st drive part or the said support part to the said axial direction by 2nd displacement amount.

With such a configuration, when the pushing amount of the outer ring by the pushing portion is insufficient only by driving the first driving portion, the first driving portion is moved in the direction approaching the pushing portion by the second driving portion. In this state, the first drive part is driven again and the outer ring is pushed by the pushing part, so that a preload can be applied to the rolling bearing so as to satisfy a desired torque.

Moreover, in the said invention, the said torque measurement part is good also as being provided with the said rolling bearing so that contact and retraction | saving are possible.
With this configuration, after applying preload to the rolling bearing device assembly, the torque measuring unit is released from the outer ring by pressing the outer ring while the torque measuring unit is separated from the rolling bearing. The rolling bearing device can be taken out without applying a load. As a result, the torque measuring unit can be prevented from being damaged, and the trouble of recalibrating the torque measuring unit can be saved.

In the invention described above, a detection unit capable of detecting contact between the pushing portion and the outer ring is provided, and the control unit detects the contact between the pushing portion and the outer ring until the detection unit detects contact between the pushing portion and the outer ring . It is good also as driving a 2 drive part and driving the said 1st drive part, when the contact of the said pushing part and the said inner ring is detected by the said detection part.
By comprising in this way, the time which pre-loads to a rolling bearing can be shortened by switching a 1st drive part and a 2nd drive part efficiently by a control part.

In the above invention, the first driving unit and the detection unit are made of a common piezoelectric element, and the piezoelectric element moves the pushing part back and forth, and the piezoelectric element makes contact between the pushing part and the outer ring. It is good also as providing the switching circuit which switches the operation | movement which detects this.
By comprising in this way, an apparatus can be made cheap by the part which makes a 1st drive part and a detection part common. Further, as compared with the case where the first drive unit and the detection unit are separate members, it is possible to prevent deformation on the apparatus side due to the pushing force when pushing the outer ring, and to push the outer ring with high accuracy.

Further, in the above invention, the second drive part moves the first drive part or the support part forward and backward in the axial direction within a range in which no preload is applied to the rolling bearing, and moves the outer ring together with the pushing part in the axial direction. It may be pushed in.
By configuring in this way, the stroke amount by which the pushing portion is advanced and retracted by the first driving portion can be reduced by the amount that the outer ring is pushed in the axial direction by driving the second driving portion. Therefore, it is possible to reduce the time required to apply the preload to the rolling bearing by pushing the outer ring in the axial direction.

  According to the present invention, it is possible to manufacture a rolling bearing device with reduced torque variation.

It is a longitudinal cross-sectional view of the rolling bearing apparatus manufactured by the manufacturing apparatus and manufacturing method which concern on one Embodiment of this invention. It is a longitudinal cross-sectional view of the manufacturing apparatus of the rolling bearing apparatus which concerns on one Embodiment of this invention. It is a flowchart which shows the manufacturing method of the rolling bearing apparatus which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of the manufacturing apparatus of the rolling bearing apparatus which concerns on the 1st modification of one Embodiment of this invention. It is a longitudinal cross-sectional view of the manufacturing apparatus of the rolling bearing apparatus which concerns on the 2nd modification of one Embodiment of this invention. It is a longitudinal cross-sectional view of the manufacturing apparatus of the rolling bearing apparatus which concerns on the 3rd modification of one Embodiment of this invention. It is a longitudinal cross-sectional view of the manufacturing apparatus of the rolling bearing apparatus which concerns on the 4th modification of one Embodiment of this invention. It is a longitudinal cross-sectional view of the manufacturing apparatus of the rolling bearing apparatus which concerns on the 5th modification of one Embodiment of this invention. It is a flowchart which shows the manufacturing method of the rolling bearing apparatus which concerns on the 5th modification of one Embodiment of this invention. It is a longitudinal cross-sectional view of the manufacturing apparatus of another rolling bearing apparatus which concerns on the 5th modification of one Embodiment of this invention. It is a longitudinal cross-sectional view of the manufacturing apparatus of another rolling bearing apparatus which concerns on the 5th modification of one Embodiment of this invention. It is a flowchart which shows the manufacturing method of another rolling bearing apparatus which concerns on the 5th modification of one Embodiment of this invention.

Hereinafter, a manufacturing apparatus and a manufacturing method of a rolling bearing device according to an embodiment of the present invention will be described with reference to the drawings.
A rolling bearing device manufacturing apparatus 100 according to the present embodiment can manufacture a rolling bearing device 1 as shown in FIG. 1 used in, for example, a hard disk drive device or the like.

  The rolling bearing device 1 includes, for example, a first rolling bearing 10 and a second rolling bearing 20 that are arranged coaxially with an interval in the axial direction, as shown in the figure, and is fitted to these rolling bearings 10 and 20. And a spacer member 33 sandwiched between the rolling bearings 10 and 20 in the axial direction.

  The shaft 31 is formed in a hollow, substantially cylindrical shape, and is provided with a flange-like flange portion 31 a that protrudes radially outward over the entire circumference at one end in the axial direction. The first rolling bearing 10 and the second rolling bearing 20 are fitted into the shaft 31 in this order from the flange portion 31a side.

  The first rolling bearing 10 includes a plurality of annular inner rings 11 and outer rings 13 that are coaxially arranged, and a plurality of annular bearings that are incorporated in an annular space between the inner ring 11 and the outer ring 13 at intervals in the circumferential direction. And rolling elements 15. The second rolling bearing 20 has the same configuration and dimensions as the first rolling bearing 10, and includes an inner ring 21 and an outer ring 23, and a plurality of rolling elements 25. Each of the rolling elements 15 and 25 is held so as to be able to roll in a state of being arranged at equal intervals by a retainer (not shown).

  The first rolling bearing 10 and the second rolling bearing 20 are configured so that the inner rings 11 and 21 and the shaft 31 are fixed by the inner rings 11 and 21 fitting the outer peripheral surface of the shaft 31 in a press-fitted state. It has become. In the first rolling bearing 10, the end surface in the axial direction of the inner ring 11 is abutted against the flange portion 31 a.

  The inner rings 11, 21 each have a deep groove type or angular type inner ring raceway on the outer peripheral surface, and the outer rings 13, 23 each have a deep groove type or angular type outer ring raceway on the inner peripheral surface. The rolling elements 15 and 25 are rolled between the inner ring raceways of the inner rings 11 and 21 and the outer ring raceways of the outer rings 13 and 23 so that the inner rings 11 and 21 and the outer rings 13 and 23 are relatively rotated. It has become.

  The spacer member 33 has, for example, a substantially annular shape whose outer dimension is substantially equal to the outer diameter dimension of the outer rings 13 and 23 and whose inner diameter dimension is smaller than the inner diameter dimension of the outer rings 13 and 23 and larger than the outer diameter dimension of the inner rings 11 and 21. have. One end surface (upper end surface) of the outer ring 13 of the first rolling bearing 10 is applied to one end surface (lower end surface) of the spacer member 33 in the axial direction. One end face (lower end face) in the axial direction of the outer ring 23 of the second rolling bearing 20 is applied to the end face (upper end face). Thereby, a gap corresponding to the axial length of the spacer member 33 is formed between the inner rings 11 and 21 of the first rolling bearing 10 and the second rolling bearing 20.

  The rolling bearing device 1 configured in this manner is fixed to the shaft 31 in a state where the inner rings 11 and 21 are pressed in directions close to each other, whereby the inner rings 11 and 21 and the outer rings 13 and 23 and the rolling elements 15 and 15 are fixed. 25 can be kept in contact with each other without any gaps, and a state in which a preload is applied to the rolling bearings 10 and 20 can be maintained. Hereinafter, the state before the preload is applied to the rolling bearings 10 and 20, that is, the state of the temporary assembly assembled until the distance between the inner rings 11 and 21 and the distance between the outer rings 13 and 23 becomes substantially the same, It is called solid 1A.

  As shown in FIG. 2, the rolling bearing device manufacturing apparatus 100 according to the present embodiment includes a mounting portion 50 on which the rolling bearing device assembly 1 </ b> A is mounted, and a rolling bearing device mounted on the mounting portion 50. A motor (rotation drive unit) 55 that rotates the shaft 31 of the assembly 1A around the axis, a pushing mechanism 60 that pushes and positions the inner rings 11 and 21 in a direction to approach each other in the axial direction, and a control that controls the pushing mechanism 60 And a load cell (torque measuring unit) 59 that measures torque transmitted from the inner rings 11 and 21 to the outer rings 13 and 23 when the inner rings 11 and 21 rotate with respect to the outer rings 13 and 23.

The motor 55 has a rotating shaft 55a extending in the vertical direction.
The mounting portion 50 suppresses slippage between the shaft receiver (support portion) 51 that can support the shaft 31, the rotation support member 53 that supports the shaft receiver 51 so as to be rotatable about the axis, and the shaft 31 and the shaft receiver 51. And a decompression unit (slip suppression unit, not shown).

The shaft receiver 51 is connected to a rotation shaft 55 a of the motor 55, is supported by a rotation support member 53, and is rotated around the axis by the motor 55. The flange 31a of the shaft 31 is fixed to the shaft receiver 51, and the shaft 31 can be arranged in the vertical direction.
The decompression part is provided in the shaft receiver 51, and adsorbs the shaft 31 by decompression.

  The pushing mechanism 60 includes an inner ring pusher (pushing portion) 61 that can push the inner ring 21 of the second rolling bearing 20 in the axial direction, a rotation support member 63 that supports the inner ring pusher 61 so as to be rotatable about the axis, and an inner ring pusher 61. And an actuator (first drive unit) 65 that advances and retracts in the axial direction.

  The inner ring pusher 61 includes a contact portion 61 a having an annular contact surface (not shown) having a dimension substantially equal to the axial end surface of the inner ring 21. The inner ring pusher 61 is disposed coaxially with the rotation shaft 55 a of the motor 55, and is provided so that the contact surface of the contact portion 61 a can contact the end surface of the inner ring 21 in the axial direction.

  When the inner ring 21 rotates about its axis in a state where the contact surface of the contact portion 61a is in contact with the end surface of the inner ring 21, the inner ring pusher 61 transmits the rotational force of the inner ring 21 to the contact portion 61a by frictional force. It rotates around the axis in synchronization with the shaft 31.

  As the actuator 65, for example, a piezoelectric element is used. The actuator 65 can move the inner ring pusher 61 in the axial direction by a predetermined displacement amount by the control unit 57.

  The load cell 59 includes a contact portion 59a made of a high friction coefficient material such as a resin having a high friction coefficient. The load cell 59 presses the contact portion 59a against the outer ring 13 of the first rolling bearing 10 from the outside in the radial direction, and acts on the outer rings 13, 23 in the circumferential direction, that is, the inner ring 11 against the outer rings 13, 23. , 21 can be measured when the torque transmitted from the inner rings 11, 21 to the outer rings 13, 23 is rotated. Torque measured by the load cell 59 is sent to the control unit 57.

  The control unit 57 outputs a drive signal for moving the inner ring pusher 61 to the actuator 65. The controller 57 controls the driving of the actuator 65 so that the torque measured by the load cell 59 is substantially constant within a predetermined allowable range.

Next, the manufacturing method of the rolling bearing device according to the present embodiment will be described with reference to the flowchart of FIG.
The manufacturing method of the rolling bearing device according to the present embodiment includes a rotation process SA1 in which the inner rings 11 and 21 are rotated with respect to the outer rings 13 and 23 of the rolling bearing apparatus assembly 51A, and the outer rings 13 and 23 by the rotation process SA1. A pushing step SA2 for pushing the inner rings 11, 21 of the two rolling bearings 10, 20 with the inner rings 11, 21 rotated in the axial direction, and an outer ring while the inner rings 11, 21 are pushed by the pushing step SA2. And a torque measuring step SA3 for measuring torque transmitted from the inner races 11 and 21 to the outer races 13 and 23 when rotating with respect to the outer races 13 and 23.

  In the pushing step S2, the driving of the actuator 65 is controlled by the control unit 57 in a state where the torque measured by the load cell 59 in the torque measuring step S3 is substantially constant within a predetermined allowable range, and the inner ring 21 is pushed. It is supposed to end.

Next, the operation of the rolling bearing device manufacturing apparatus 100 and the manufacturing method according to the present embodiment configured as described above will be described.
In order to manufacture the rolling bearing device 1 by the rolling bearing device manufacturing apparatus 100 and the manufacturing method according to the present embodiment, first, the rolling bearing device 1 is temporarily assembled, and then the flange portion 31a of the shaft 31 is attached to the shaft receiver 51. The rolling bearing device assembly 1A is mounted on the mounting portion 50.

  Then, the contact surface of the contact portion 61 a of the inner ring pusher 61 is brought into contact with the axial end surface of the inner ring 21 of the second rolling bearing 20, and the contact portion 59 a of the load cell 59 is brought into contact with the outer peripheral surface of the outer ring 13 of the first rolling bearing 10. Make contact. Further, a predetermined torque value is set in the control unit 57.

  Next, the motor 55 is operated to rotate the shaft 31 together with the shaft receiver 51 around the rotation axis 55a (rotation process SA1). When the shaft 31 is rotated about the axis, the inner rings 11 and 21 press-fitted into the shaft 31 rotate about the axis with respect to the outer rings 13 and 23, and torque is transmitted from the inner rings 11 and 21 to the outer rings 13 and 23. .

  Next, the control unit 57 drives the actuator 65 to move the inner ring pusher 61 in the axial direction. Then, the inner ring 21 rotated with respect to the outer ring 23 of the second rolling bearing 20 is pressed in the axial direction, and the inner ring 21 is pushed in the direction approaching the inner ring 11 of the first rolling bearing 10 (indentation). Step SA2).

  In this case, since the inner ring 11 is abutted against the flange portion 31a, the inner rings 11, 21 can be brought close to each other in the axial direction simply by pushing the inner ring 21 in the axial direction. As a result, preload is applied to the first rolling bearing 10 and the second rolling bearing 20, and the torque transmitted from the inner rings 11, 21 to the outer rings 13, 23 increases.

  Further, when the inner rings 11, 21 are rotating with respect to the outer rings 13, 23, the torque transmitted from the inner rings 11, 21 to the outer rings 13, 23 is measured by the load cell 59 (torque measurement step SA3). In this case, since the shaft 31 is rotated about the axis together with the shaft 31 while being prevented from sliding with the shaft receiver 51 by the decompression unit, the shaft 31 can be rotated at a constant rotational speed determined by the motor 55.

  Furthermore, the inner ring pusher 61 is rotated about the axis in synchronization with the inner ring 21 by frictional force, and slippage between the shaft receiver 51 and the shaft 31 and slippage between the inner ring 21 and the inner ring pusher 61 are suppressed. Therefore, the shaft 31 can be rotated more smoothly, and it is possible to prevent the torque transmitted from the inner rings 11 and 21 to the outer rings 13 and 23 from changing due to fluctuations in the rotational speed of the shaft 31 due to slipping. Therefore, accurate torque can be measured. Moreover, it can prevent that the measured value of torque falls and it can prevent applying too much preload.

The torque measured by the load cell 59 is sent to the control unit 57, and the control unit 57 drives the actuator 65 until the measured value of the torque substantially matches a predetermined torque value set in advance. When the torque becomes substantially constant within a predetermined allowable range, the driving of the actuator 65 is stopped by the control unit 57, and the pushing of the inner ring 21 is finished.
As a result, the rolling bearing device 1 is completed in which the inner ring 21 is press-fitted and fixed to the shaft 31 in a state where the first rolling bearing 10 and the second rolling bearing 20 are preloaded.

  As described above, according to the rolling bearing device manufacturing apparatus and manufacturing method according to the present embodiment, the inner rings 11 and 21 are rotated with respect to the outer rings 13 and 23 while preloading the rolling bearings 10 and 20. In this case, the torque variation is reduced by controlling the pushing of the inner ring 21 so that the torque transmitted from the inner rings 11, 21 to the outer rings 13, 23 becomes substantially constant within a predetermined allowable range. The rolling bearing device 1 can be manufactured.

  In the present embodiment, the decompression unit has been described as an example of the slip suppression unit. Instead, for example, a high friction coefficient material such as Teflon (registered trademark) rubber or urethane resin having a high friction coefficient is employed. It is good as well. In this case, a high coefficient of friction material may be disposed between the shaft receiver 51 and the shaft 31. Moreover, it is good also as employ | adopting the chuck which hold | grips the shaft 31 from outer periphery as a slip suppression part. In this case, a chuck may be disposed on the shaft receiver 51. Moreover, it is good also as employ | adopting the screw which fastens the shaft receiver 51 and the shaft 31 as a slip suppression part.

  In the present embodiment, the inner ring pusher 61 is held by the rotation support member 65 and the inner ring pusher 61 is rotated in synchronization with the inner ring 21, but the inner ring pusher 61 is fixed and does not rotate about the axis. It is good as well.

Moreover, in this embodiment, it can deform | transform as follows.
In the present embodiment, the rotation of the shaft receiver 51 is transmitted to the inner ring pusher 61 only by the frictional force of the inner ring 21, but as a first modification, for example, as shown in FIG. A belt 71 to be connected and a belt 73 to be connected to the inner ring pusher 61, and a rod-shaped rotation transmission member 75 to which these belts 71 and 73 are connected and capable of transmitting the rotation of the shaft receiver 51 to the inner ring pusher 61 are provided. It is good also as providing the rotation transmission mechanism 70 which has. In this case, the rotation transmitting member 75 may be disposed so as to be rotatable around the axis in parallel with the rotation shaft 55a, and the belt 71 and the belt 73 may be connected with an interval in the axial direction.

  By doing so, it is possible to positively transmit the rotation of the shaft receiver 51 to the inner ring pusher 61 and to reliably synchronize the rotation of the inner ring 21 and the rotation of the inner ring pusher 61. Therefore, it is possible to prevent the slip between the inner ring 21 and the inner ring pusher 61 and to prevent the torque from fluctuating due to the slip. As a result, the preload can be accurately set to a desired torque.

  As a second modification, as shown in FIG. 5, a shaft pusher (pressing portion) 82 including a columnar pressing member 81 and a spring member 83 that press the shaft 31 in the axial direction and press the shaft 31 against the shaft receiver 51 is provided. It is good. In this case, the pressing member 81 is disposed so as to be able to advance and retreat along the rotation axis on the inner side in the radial direction of the contact portion 61a of the inner ring pusher 61, and the spring member 83 is connected to the pressing member 81 and can be expanded and contracted along the rotation axis. What is necessary is just to arrange.

  By doing so, the shaft 31 of the rolling bearing device assembly 1A is moved by the shaft pusher 82 even when the inner ring 21 is not pushed by the inner ring pusher 61 or when the pressure between the inner ring pusher 61 and the inner ring 21 is low. By pressing against the shaft receiver 51, it is possible to prevent slippage between the shaft 31 and the shaft receiver 51. Therefore, it is possible to prevent the torque transmitted from the inner rings 11 and 21 to the outer rings 13 and 23 from being reduced due to the change in the rotation speed of the shaft 31 due to slipping. As a result, it is possible to measure an accurate torque and prevent excessive preload.

  As a third modified example, as shown in FIG. 6, in the manufacturing apparatus 100 according to the second modified example, a displacement amount (hereinafter referred to as a first displacement amount) of an actuator 65 (hereinafter referred to as a first actuator 65). ) And a second actuator (second drive unit) 85 capable of moving the first actuator 65 back and forth in the axial direction with a second displacement amount larger than the total displacement amount of the first actuator 65. In this case, the control unit 57 may control the driving of the first actuator 65 and the second actuator 85.

  In this case, when the amount of pushing of the inner ring 21 by the inner ring pusher 61 is insufficient only by driving the first actuator 65, the displacement of the first actuator 65 is temporarily returned to the original, and the second actuator 85 uses the second displacement amount as the first displacement amount. After the actuator 65 is moved in the axial direction, the first actuator 65 is driven again and the inner ring 21 is pushed again by the inner ring pusher 61.

  In this modification, a piezoelectric element is employed as the first actuator 65, and a slide motor or the like configured by attaching a feed screw to a stepping motor (not shown) is employed as the second actuator 85, for example. That's fine.

  By doing in this way, the 1st actuator 65 consisting of a piezoelectric element can control a minute displacement, and can control torque accurately. Then, the position of the first actuator 65 can be easily adjusted by a second displacement amount equal to or smaller than the total displacement amount of the first actuator 65 by the second actuator 85 formed of a stepping motor.

In this modification, the second actuator 85 moves the first actuator 65 in the axial direction within a range in which no preload is applied to the rolling bearings 10, 20, and the inner ring pusher 61 and the inner ring 21 are moved to a predetermined position. It may be pushed in the direction.
By doing so, the stroke amount by which the inner ring pusher 61 is advanced and retracted by the first actuator 65 can be reduced by the amount that the inner ring 21 is pushed in the axial direction by driving the second actuator 85. Therefore, it is possible to reduce the time required for preloading the rolling bearings 10 and 20 by pushing the inner ring 21 in the axial direction.

  As a fourth modified example, as shown in FIG. 7, in the manufacturing apparatus 100 according to the third modified example, a load cell 59 may be provided so as to be able to contact and retract with respect to the outer ring 13 of the first rolling bearing 10. . In this case, for example, the load cell 59 may be disposed so as to be able to advance and retreat in the radial direction of the outer ring 13.

  In this way, after the preload is applied to the rolling bearing device assembly 1A, the first actuator 65 is axially moved by the second actuator 85 in a state where the load cell 59 is separated from the outer ring 13 of the first rolling bearing 10. And the contact state between the inner ring pusher 61 and the inner ring 21 and the contact between the shaft pusher 82 and the shaft 31 are released, so that the rolling bearing device 1 can be taken out without applying an excessive load to the load cell 59. . As a result, the load cell 59 can be prevented from being damaged, and the trouble of recalibrating the load cell 59 can be saved.

  As a fifth modified example, as shown in FIG. 8, a pressure sensor (detection unit) 87 that can detect contact between the inner ring pusher 61 and the inner ring 21 may be further provided. Then, as shown in the flowchart of FIG. 9, after the rotation step SA1, the control unit 57 detects the contact between the inner ring pusher 61 and the inner ring 21 by the pressure sensor 87 (detection step SB1), and the detection step SB1 detects the inner ring pusher. The second actuator 85 is driven until contact between the inner ring 21 and the inner ring 21 is detected (contact process SB2), and the first actuator 65 is driven when the detection process SB1 detects contact between the inner ring pusher 61 and the inner ring 21. It is also possible to make it.

  In FIG. 8, a pressure sensor 87 is disposed between the first actuator 65 and the second actuator 85 to detect the pressing force of the first actuator 65 against the second actuator 85.

  By doing in this way, the control part 57 can switch the 1st actuator 65 and the 2nd actuator 85 efficiently, and the time which preloads to the rolling bearings 10 and 20 can be shortened. In other words, the first actuator 65 is driven while monitoring the torque measured by the load cell 59, and when the displacement amount of the inner ring pusher 61 is insufficient, the second actuator 85 is driven by the second displacement amount, and the first actuator again. Compared with the case where the actuator 65 is driven and the inner ring 21 is pushed in, the rolling bearing device 1 in a state where a preload is applied by effectively using the displacement amount of the first actuator 65 can be manufactured in a short time. .

  In the present modification, the pressure sensor 87 is disposed between the first actuator 65 and the second actuator 85. Instead of this, for example, a pressure is applied between the first actuator 65 and the inner ring pusher 61. The sensor 87 may be disposed, and the pressure sensor 87 may detect the pressing force of the inner ring pusher 61 against the first actuator 65.

  Further, for example, as shown in FIG. 10, a holding portion 91 that holds the shaft receiver 51 rotatably around the rotation axis 55 a and a base 93 that fixes the holding portion 91 are provided, and the holding portion 91 and the base 93 are provided. The pressure sensor 87 may be disposed between the two and the pressure sensor 87 may detect the pressing force of the holding portion 91 against the base 93.

  In this modification, as shown in FIG. 11, a switching circuit (switching circuit) 95 that connects the first actuator 65 and the control unit 57 is provided, and the switching circuit 95 performs a first operation based on a drive signal from the control unit 57. It is also possible to switch between the circuit 95a that drives the actuator 65 by applying a voltage and the circuit 95b that sends the voltage generated by the load applied to the first actuator 65 to the controller 57.

  In this case, for example, as shown in the flowchart of FIG. 12, after the rolling bearing device assembly 1A is assembled and placed on the shaft receiver 51, the shaft 31 is rotated together with the shaft receiver 51 around the rotation axis 55a (rotation). Step SA1), the voltage applied to the first actuator 65 is monitored by the pressure sensor 87 set in the circuit 95b (detection step SB1), and the second actuator 85 is moved until the inner ring pusher 61 and the inner ring 21 come into contact with each other by the control unit 57. What is necessary is just to drive (contact process SB2).

  When the contact between the inner ring pusher 61 and the inner ring 21 is detected by the pressure sensor 87, the switching circuit 95 switches from the circuit 95b to the circuit 95a (switching SB3), and a voltage is applied to the first actuator 65 to drive it. The inner ring pusher 61 may be used to push the inner ring 21 (pushing process SA2).

  Thereafter, when a predetermined torque is measured by the load cell 59 (torque measurement step SA3), the pushing of the inner ring 21 is finished by the control unit 57, and the first actuator 65 is moved back in the axial direction by driving the second actuator 85, and the inner ring The pusher 61 and the shaft pusher 82 are retracted, and the load cell 59 is also retracted (retreat SB4), and the rolling bearing device 1 is taken out.

  In the present modification, the first actuator 65 is illustrated as the first drive unit and the pressure sensor 87 is illustrated as the detection unit, but instead, for example, the first drive unit and the detection unit are common. A piezoelectric element may be used. The switching circuit 95 may be used to switch between the operation of pushing the inner ring 21 by moving the inner ring pusher 61 in the axial direction by the piezoelectric element and the operation of detecting the contact between the inner ring pusher 61 and the inner ring 21 by the piezoelectric element. Good.

  By doing in this way, the manufacturing apparatus 100 can be made inexpensive by the amount that the first drive unit and the detection unit are made common using one piezoelectric element. Further, as compared with the case where the first drive unit and the detection unit are separate members, the inner ring pusher 61 prevents the inner ring 21 from being deformed by the pushing force when the inner ring 21 is pushed in, and the inner ring 21 is moved in the axial direction. It can be pushed in with high accuracy.

  As mentioned above, although one Embodiment of this invention and its modification were explained in full detail with reference to drawings, the concrete structure is not restricted to this Embodiment, The design change of the range which does not deviate from the summary of this invention Etc. are also included. For example, the present invention is not limited to those applied to the above-described one embodiment and modifications, but may be applied to embodiments in which these embodiments and modifications are appropriately combined, and is not particularly limited. Absent.

  Specifically, the torque transmitted to the inner ring may be measured by pressing a hollow shaft into the outer ring, pushing the outer rings in the axial direction and rotating the outer ring. In addition, an example in which two rolling bearings are configured by two inner rings and two outer rings arranged coaxially has been shown. However, a structure in which two inner rings or two outer rings and a spacer member are integrated, that is, an inner ring or The structure in which either one of the outer rings is composed of a single member and has two race rings is also arranged according to the present invention “having the inner ring and the outer ring that are relatively coaxially arranged and arranged coaxially with an axial interval therebetween. "Two rolling bearings".

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 1A Rolling bearing apparatus assembly 10 1st rolling bearing 11,21 Inner ring | wheel 13,23 Outer ring | wheel 15,25 Rolling element 20 2nd rolling bearing 31 Shaft (shaft member)
51 Shaft support (support)
55 Motor (rotary drive)
59 Load cell (torque measurement unit)
61 Inner ring pusher (push-in part)
65 (First) Actuator (First Drive Unit)
70 Rotation transmission mechanism 82 Shaft pusher (pressing part)
85 Second actuator (second drive unit)
87 Pressure sensor (detector)
95 Switching circuit (switching circuit)
SA1 rotation process SA2 indentation process SA3 torque measurement process SB1 detection process SB2 contact process

Claims (13)

Two rolling bearings having an inner ring and an outer ring that are coaxially arranged and having an inner ring and an outer ring that are coaxially arranged with a space in the axial direction, and are fitted into the outer rings of the two rolling bearings in a press-fit state. A rotary drive unit that rotates the shaft member about an axis of a rolling bearing device assembly including the shaft member;
Pushing in the direction in which the outer rings of the two rolling bearings are close to each other in the axial direction, and pushing parts for positioning these outer rings ;
A torque measuring unit for measuring a torque in which the outer ring to the inner ring by rotation of the shaft member is transmitted from the outer race to the inner race when rotated,
An apparatus for manufacturing a rolling bearing device, comprising: a control unit that controls the pushing portion so that the torque measured by the torque measuring unit is substantially constant within a predetermined allowable range. A support part that supports the shaft member and is rotatable about the axis by the rotation drive part;
The apparatus for manufacturing a rolling bearing device according to claim 1 , further comprising a slip suppression portion that suppresses slip between the support portion and the shaft member. The rolling bearing device manufacturing apparatus according to claim 2 , wherein the pushing portion is provided so as to be rotatable around the axis together with the inner ring while pushing the inner ring. The rolling bearing device manufacturing apparatus according to claim 2 , wherein the pushing portion is provided so as to be rotatable around the axis together with the outer ring while pushing the outer ring. Apparatus for manufacturing a rolling bearing device according to claim 3 or claim 4 comprising a rotation transmitting mechanism for synchronizing and said axis rotation of the shaft rotation and the pushing portion around the support portion. The rolling bearing device manufacturing apparatus according to any one of claims 2 to 5 , further comprising a pressing portion that presses the shaft member in the axial direction against the support portion. A first drive unit that moves the pushing portion forward and backward in the axial direction by a predetermined first displacement amount;
A second drive unit capable of moving the first drive unit or the support unit back and forth in the axial direction with a second displacement amount that is larger than the first displacement amount of the first drive unit and smaller than the total displacement amount. The manufacturing apparatus of the rolling bearing apparatus in any one of Claims 1-6 . The manufacturing apparatus of the rolling bearing device according to any one of claims 1 to 7 , wherein the torque measuring unit is provided so as to be able to contact and retract with respect to the rolling bearing. A detection unit capable of detecting contact between the pushing portion and the inner ring or the outer ring;
The control unit drives the second drive unit until the detection unit detects contact between the pushing unit and the inner ring or the outer ring, and the detection unit detects contact between the pushing unit and the inner ring. The rolling bearing device manufacturing apparatus according to claim 7 or 8 , wherein the first drive unit is driven in the case of being performed. The first drive unit and the detection unit are made of a common piezoelectric element,
10. The rolling bearing device according to claim 9 , further comprising a switching circuit that switches between an operation of moving the pushing portion back and forth by the piezoelectric element and an operation of detecting contact between the pushing portion and the inner ring or the outer ring by the piezoelectric element. apparatus. Said second driving unit, said advanced and retracted in the axial direction of said first driving unit or the supporting unit in a range not less preload to the rolling bearing, claim 7 or claim pushes the inner ring in the axial direction together with the pushing portion The manufacturing apparatus of the rolling bearing apparatus of 8 . A rotating step of rotating the outer ring with respect to an outer ring of a rolling bearing assembly in which a shaft member is press-fitted in a fitted state to inner rings of two rolling bearings arranged coaxially with an interval in the axial direction;
A pushing process of pushing the outer rings of the two rolling bearings, in which the outer ring is rotated with respect to the inner ring by the rotation process, in a direction in which the outer rings are close to each other in the axial direction;
A torque measuring step of measuring torque transmitted from the outer ring to the inner ring when the outer ring rotates with respect to the inner ring while being pushed by the pushing step;
The method of manufacturing a rolling bearing device, wherein the pushing step ends the pushing of the outer ring in a state where the torque measured by the torque measuring step is substantially constant within a predetermined allowable range. A detection step of detecting contact between the outer ring and the pushing portion;
A contact step of moving the pushing portion in a direction approaching the outer ring until contact between the outer ring and the pushing portion is detected by the detection step,
The method of manufacturing a rolling bearing device according to claim 12 , wherein in the pressing step, when the contact between the outer ring and the pressing portion is detected by the detecting step, the inner ring is pressed by the pressing portion.

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