JP2001082493A - Pre-loading method of rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble raceway surface or turning surface without damaging. SOLUTION: An inner ring 17 with a second inner ring raceway 18 is fitted externally to a shaft 15 with a first inner ring raceway 16 in this pre-loading method. The pitch P1 for both raceways 16, 18 is made to be larger than the required pitch P1 for applying prescribed preload. Under this condition, balls 5, 5 are inserted between outer ring raceways 43, 43 on the inner circumference of an outer ring 19 and the second inner ring raceways 16, 18. Then, balls 5, 5 are arranged at equal intervals along the circular direction. Next, the inner ring 17 is displaced to an axial direction, setting the pitch to P1 to apply required preload.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive (HD) for a video tape recorder (VTR), for example.
D), video tape recorder (VTR), laser beam printer (LBP) spindle motor, rotary actuator, rotary encoder, etc. About the method.

[0002]

2. Description of the Related Art Ball bearings are used to rotatably support a spindle of a VTR or HDD while preventing whirling motion (movement in a direction perpendicular to the axis) and axial wobbling. Used a pair of independent ball bearings (deep groove type or angular type). Further, in order to increase the efficiency of the operation of assembling the ball bearing to the rotation supporting portion, use of a double-row ball bearing has been considered.

As shown in FIG. 12A, a double-row ball bearing has a shaft 2 having a pair of deep-groove inner ring raceways 1 on its outer peripheral surface, and a shaft 2 having a pair of deep-groove inner raceways 1 as shown in FIG. An outer race 4 having a pair of deep groove outer races 3 on its inner peripheral surface is combined concentrically as shown in FIG.
And a plurality of balls 5, 5 between the outer ring raceways 3, 3, respectively.
It is configured to be freely rolled. FIG. 12 (C)
6 and 6 are retainers for holding the balls 5 and 5 at equal intervals in the circumferential direction, and 7 and 7 are seals for preventing dust and the like from entering the mounting portions of the balls 5 and 5. It is.

A double-row deep groove ball bearing as shown in FIG. 12C has a conventionally known structure.
Conventionally, those which can support the spindle of R or HDD have been difficult to manufacture. This is for the following reason.

[0005] Ball bearings for supporting spindles of VTRs and HDDs must have extremely high precision in order to prevent whirling motion and axial deflection. For this reason, the spindle bearing ball bearing is used in a state where an axial preload is applied.

On the other hand, when the balls 5, 5 are mounted between the inner raceway 1 and the outer raceway 3 in order to assemble a deep groove ball bearing, as shown in FIG. 3
Eccentrically, the gap 8 extending in the circumferential direction between the two raceways 1 and 3 is partially increased, and from the enlarged portion of the gap 8 between the inner raceway 1 and the outer raceway 3 Then, a predetermined number of balls 5, 5 are inserted. Thereafter, the inner raceway 1 and the outer raceway 3 are made concentric, and the predetermined number of balls 5, 5
Are arranged at equal intervals in the circumferential direction.

As described above, when the plurality of balls 5, 5 inserted together in a part in the circumferential direction are rearranged at equal intervals in the circumferential direction, each of the balls 5, 5 is connected to the inner ring track 1 and It must slide against the outer raceway 3. At this time, when the inner raceway 1 and the outer raceway 3 are in a state of strongly pressing the balls 5 and 5 (in a state where a preload is applied), the rolling of the inner raceway 1 and the outer raceway 3 and the balls 5 and 5 are performed. The surface is easily scratched, and if it is scratched, there are problems such as occurrence of vibration during rotation or loss of durability.

On the other hand, for example, Japanese Patent Application Laid-Open No. 57-200
As described in Japanese Patent No. 722, in the case of a structure in which a pair of single row deep groove ball bearings are provided at an interval from each other, the ball bearings are assembled without applying a preload. At the expense of no inconvenience, the work of assembling the ball bearing becomes complicated.

For example, Japanese Patent Application Laid-Open Nos. 61-65913 and 61-79899, and Japanese Utility Model Laid-Open No. 50-1017.
No. 53 and No. 56-127456 are used for tension pulleys or water pumps.
Double row deep groove ball bearings are described, but none of these require very high rotational accuracy.
Used without applying preload, VTR or H
It cannot be used to support a spindle such as a DD.

Japanese Unexamined Patent Publication (Kokai) No. 61-145761 discloses a double-row angular contact ball bearing.
Japanese Patent Publication No. 3 (1994) discloses a double row ball bearing in which a deep groove ball bearing and an angular ball bearing are combined.
However, when assembling an angular ball bearing,
When the ball passes over the shoulder of the raceway surface, in order not to damage the shoulder and the rolling surface of the ball, for example, Japanese Utility Model Publication No. 39-3916
As described in Japanese Patent Application Laid-Open Publication No. H10-209, the outer ring needs to be heated and expanded, and the assembling work is troublesome.

Japanese Patent Publication No. 57-140912 discloses a double row deep groove ball bearing having an outer ring in which a main outer ring and an auxiliary outer ring which is displaceable in the axial direction of the main outer ring are provided without applying preload. After assembling, the auxiliary outer ring is displaced in the axial direction to apply a predetermined preload, and the invention in which the auxiliary outer ring is fixed with a retainer, and the auxiliary outer ring is axially pressed by a spring to provide a predetermined The invention that performs the preload application of the pressure is described. However, in the case of the invention described in this publication, a presser and a spring are required, which not only complicates parts management and assembling work, but also increases the axial length of the ball bearing more than necessary.

Also, US Pat. No. 4,900,958 describes a structure as shown in FIGS. In the case of the structure shown in FIG. 14, a pair of deep groove type (angular type) ball bearings 9, 9 are provided between the outer peripheral surface of the shaft 2 and the inner peripheral surface of the housing 10. The inner rings 11, 11 of the ball bearings 9, 9 are pressed in directions approaching each other to apply preload to the balls 5, 5 of the two ball bearings 9, 9.

That is, the end face of one (the right side in FIG. 14) inner ring 11 is abutted against the retaining ring 12, and the other (the left side in FIG. 14) inner ring 11 is pressed toward the retaining ring 12 to preload. Grants are being made. The other inner ring 11 is fixed to the shaft 2 by an adhesive. Therefore, the other inner ring 11 continues to be pressed toward the retaining ring 12 with a load corresponding to the preload until the adhesive is solidified.

In the case of the structure shown in FIG. 15, the inner raceways 1, 1 of a double row are formed on the outer peripheral surface of the shaft 2. A spacer 13 is sandwiched between a pair of outer races 4 fitted inside the housing 10, and the outer races 4, 4 are pressed by the spacer 13 in a direction away from each other to apply a preload to the balls 5, 5. are doing.

In Japanese Utility Model Laid-Open Publication No. Hei 3-36517, as shown in FIG. 16, a leaf spring 14 sandwiched between a pair of outer rings 4, 4 pushes both outer rings 4, 4 in a direction away from each other. Further, a structure for applying a preload to the balls 5, 5 is described.

Further, Japanese Patent Application Laid-Open No. Hei 3-222661 and US Pat. No. 5,045,738 describe structures as shown in FIGS. Among them, the structure shown in FIG. 17 applies the preload by pressing the outer ring 4 fitted inside the housing 10 by the leaf spring 14, and the structure shown in FIG. 18 applies the predetermined preload. The outer ring 4 is fixed to the housing 10 by an adhesive or shrink fitting. Of the multiple rows of outer raceways 3, 3, one outer raceway 3 is formed on the inner circumferential surface of the outer race 4 and the other outer raceway 3 is formed on the inner circumferential surface of the housing 10, respectively.

Further, although not shown, Japanese Patent Application Laid-Open No.
No. 45761 and U.S. Pat. No. 4,713,704 disclose that one inner ring raceway of a double-row inner raceway is formed on the outer peripheral surface of a shaft, and the other inner raceway is formed on the outer peripheral surface of an inner race fitted externally to the shaft. A structure is described in which each is formed and the inner ring is bonded and fixed to a shaft in a state where an appropriate preload is applied to the ball.

[0018]

SUMMARY OF THE INVENTION The rolling bearing device to which the preload is applied according to the present invention can improve the accuracy of the rotation supporting portion without particularly troublesome assembling work and parts management, thereby improving the rotation supporting portion. The purpose is to improve the performance of various devices having parts.

The structure shown in FIGS. 14 to 18 and the structure described in Japanese Patent Application Laid-Open No. 61-155761, etc., have the problems that assembly is troublesome and that parts management is required as described above. In addition, micro vibration is easily generated. In other words, any of the above conventional structures requires
When the inner ring 11 is in relation to the shaft 2 (in the case of the structure shown in FIG. 14),
Alternatively, since the outer ring 4 is loosely fitted to the housing 10 (in the case of each structure shown in FIGS. 15 to 18), the inner ring 11 or the outer ring 4 is slightly However, it is easy to incline. When the bearing is tilted, a small vibration is generated when the obtained rolling bearing device rotates, which may deteriorate the performance of an HDD or the like incorporating the bearing device.

Further, the inner ring 11 is connected to the shaft 2 or the outer ring 4
Is fixed to the housing 10 with an adhesive or by shrink fitting at a factory that manufactures a rolling bearing device, and a person (user) who purchases this bearing device and incorporates it into an HDD or the like can use this bearing. The preload of the device cannot be changed. For this reason, even if it is desired to adjust the preload due to a difference in specifications or the like, at present, the bearing device is used without adjusting the preload of the bearing device.

In order for the HDD or the like to exhibit the best performance, it is preferable to adjust the preload of the bearing device according to the use of the HDD or the like.

Japanese Patent Application Laid-Open No. 1-266320 discloses that a piezoelectric actuator presses outer rings in a direction away from each other to apply a preload to a rolling bearing device and adjust a voltage applied to the piezoelectric actuator.
A structure in which the preload is adjustable is described. However, in the case of the structure described in this publication, it is inevitable that the entire rolling bearing device becomes large,
Although it can be incorporated in large equipment, it is difficult to incorporate it in small equipment such as HDD.

The rolling bearing device to which the preload is applied and the method of manufacturing the same according to the present invention eliminates any of the above-mentioned disadvantages.

[0024]

According to the present invention, a preloaded rolling bearing device and a method of manufacturing the same are provided with a first member having a first peripheral surface and a concentric arrangement with the first member. A second member having a second peripheral surface facing the first peripheral surface, a first track formed on the first peripheral surface, and a first track formed by a part of the second peripheral surface. A second track formed on a portion facing the second track, and a third track formed on the second peripheral surface at a portion shifted in the axial direction from the second track, with sufficient fitting strength. A third member having a third peripheral surface concentrically supported by the first and second members and having a third peripheral surface facing the second peripheral surface, In a part of the peripheral surface, a fourth track formed in a portion facing the third track, between the first track and the second track, and the third track. A plurality of balls are provided between each of the four tracks, and by adjusting the fitting depth of the third member to the first member, the plurality of balls are appropriately adjusted to the plurality of balls. Preload is applied.

Then, in order to perform an appropriate preload, the third member is press-fitted into the first member while measuring the resonance frequency of the rolling bearing device, and the resonance frequency becomes substantially equal to a predetermined frequency. In the same state, the press-fitting operation of the third member is terminated (claim 3), or a load in the axial direction is applied to any one of the first to third members,
While measuring the displacement of any one of the members, the third member is press-fitted to the first member, and in a state where the displacement substantially matches a preset value, the third member is pressed. The press-fitting operation of the member is terminated (claim 4), or any one of the first, third, and second members is rotated at a predetermined rotation speed, and the vibration generated during this rotation is performed. While measuring the characteristics of the third member, the third member is press-fitted to the first member, and the press-fitting operation of the third member is completed in a state where the characteristics of the vibration substantially match the characteristics set in advance. In a state where no preload is applied to each of the plurality of balls, a predetermined one of the first, third, and second members is applied along the axial direction. The member is displaced by applying a load having a size of, and the amount of displacement of the member is measured. After determining the play amount in the axial direction of the device, the third member is pressed in the axial direction by a set length corresponding to the determined play amount (claim 6), or the first and second members are pressed. While measuring the loss torque while rotating any member of the third member and the second member at a predetermined rotation speed, the third member is press-fitted to the first member, and the loss torque is reduced. The press-fitting operation of the third member is terminated in a state substantially matching the preset value (claim 7).

[0026]

The preloaded rolling bearing device and the method of manufacturing the same according to the present invention, constructed as described above, can damage the rolling surfaces of the balls and the double-row inner and outer raceways. In addition, it is possible to assemble the rolling bearing device and to apply an axial preload to each ball.

Further, since the first and third members are fitted with an interference fit, the third member does not incline with this preloading operation, and is further restricted by the interference fit. Since displacement is possible by applying a force greater than the force in the axial direction, the applied preload can be adjusted later.

[0028]

FIG. 1 shows a first embodiment of the present invention.
As shown in FIG. 1A, the shaft 15, which is the first member, has a small diameter portion 15a and a large diameter portion 15b continuous with a step portion 15c, and has a large diameter portion 15b, which is a first peripheral surface. A first inner raceway 16 of a deep groove type, which is a first raceway, is formed on the outer peripheral surface of the inner raceway. The inner ring 17, which is the third member, has an inner diameter slightly smaller than the outer diameter of the small diameter portion 15a in a free state.
The inner ring 17 forms a second grooved inner raceway 18 of a deep groove type as a fourth raceway on the outer peripheral surface.

When a rolling bearing device including such a shaft 15 and an inner ring 17 is manufactured, first, as a first step, FIG.
As shown in (B), the inner ring 17 is externally fitted to the small-diameter portion 15a of the shaft 15 with sufficient fitting strength (strength that does not shift due to the reaction force of the preload application). And the large diameter portion 1
The pitch P ₁ of the first inner ring raceway 16 and the inner ring 17 the outer peripheral surface of the second inner ring raceway 18 of 5b outer peripheral surface, the pitch p ₁ required to apply a predetermined preload to the rolling bearing apparatus of the completed
It is longer (P ₁ > p ₁ ) than (FIG. 1D).

Next, as a second step, the shaft 15 and the inner ring 17 assembled in the first step are inserted into a cylindrical outer ring 19 as a second member. A pair of deep-groove outer raceways 43, 43, which are second and third raceways, are formed on the inner circumferential surface of the outer race 19, which is the second circumferential surface. Then, the pair of outer raceways 43, 43 and the first and second inner raceways 16, 18 are opposed to each other.

Next, as a third step, the shaft 15, the inner race 17 and the outer race 19 are eccentric, and as shown in FIG. 13, the pair of outer raceways 43, 43 and the first and second inner races are formed. The circumferential gap 8 between the tracks 16 and 18 is partially increased. Then, a predetermined number of balls 5, 5 are inserted into the gap 8 from the enlarged portion of the gap 8.

Next, as a fourth step, a predetermined number of balls 5, 5 inserted in the gap 8 between the pair of outer raceways 43, 43 and the first and second inner raceways 16, 18 are formed. Are moved in the circumferential direction, and the balls 5, 5 are arranged at equal intervals in the circumferential direction while the shaft 15 and the inner ring 17 and the outer ring 19 are concentric.
At the same time, as shown in FIG. 1 (C), the retainers 6, 6 are attached to the respective ball row portions so that the balls 5, 5 remain at equal circumferential positions. If necessary, seals 7 are mounted on the inner peripheral surfaces of both ends of the outer ring 19. In this state, no preload has yet been applied to the balls 5,5.

Finally, as a fifth step, the inner ring 17 is directed toward the stepped portion 15c, and is displaced in the axial direction (to the left in FIG. 1) on the outer peripheral surface of the shaft 15, whereby the first and second processes are performed. the pitch of the inner ring raceway 16, 18 is shortened, the pitch p ₁ required to impart the predetermined preload. In this state,
A predetermined preload is applied to the plurality of balls 5, 5 to complete a preloaded rolling bearing device. At the time of completion, there is a gap between the stepped portion 15c and the end face of the inner ring 17.

In the rolling bearing device provided with the preload obtained as described above, the preload is applied between the inner peripheral surface of the inner race 17 and the outer peripheral surface of the small diameter portion 15a based on the frictional force of the interference fit. A stopping force greater than the corresponding axial load acts. Therefore, even if the adhesive is not applied between the shaft 15 and the inner ring 17, the inner ring 17 does not move and does not disappear, and the applied preload does not disappear, so that it can be handled as an integrated ball bearing.
For this reason, the work of configuring the bearing portion of the spindle of the VTR or the HDD becomes easy. In addition, since the preload is applied in the axial direction, the rotation of the spindle can be supported with high accuracy.

However, the inner ring 17 can be displaced with respect to the small diameter portion 15a by applying a force in the axial direction larger than the stopping force due to the interference fit. For this reason, if an appropriate force larger than the load is applied to the inner ring 17 and the inner ring 17 is displaced in the axial direction,
The preload applied to the rolling bearing device can be adjusted (increased or decreased) later.

FIG. 2 shows a second embodiment of the present invention. In the above-described first embodiment, in the first step, the inner ring 17 having the second inner raceway 18 formed on the outer peripheral surface in advance is replaced with the small diameter portion of the shaft 15 having the first inner raceway 16 formed on the outer peripheral surface in advance. In the present embodiment, the inner ring 17a is externally fitted to the small-diameter portion 15a, while the outer ring 15a is externally fitted to the shaft 15 as shown in FIGS. First and second inner raceways 16a, 18 are provided on the outer peripheral surface of the inner race 17a, respectively.
a.

By adopting such a configuration, the inner ring 1
The outer race 7 (FIG. 1) can be prevented from being non-circularly distorted by fitting the 7a to the small diameter portion 15a. In other words, in the case of the present embodiment, the second inner raceway 18a is formed in a state where the shaft 15 and the inner race 17a are assembled.
The roundness of the shaft 8a can be made very accurate, and the amount of eccentricity between the inner raceway 18a and the shaft 15 can be suppressed to a small extent.

Since the other constructions and operations are the same as those of the first embodiment, the same reference numerals are given to the same parts, and
A duplicate description will be omitted.

Next, FIG. 3 shows a third embodiment of the present invention. As shown in FIG. 3 (A), a small-diameter portion 20a, a large-diameter portion 20b, and both portions 20a, 20b are continuously formed on an inner peripheral surface, which is a first peripheral surface, of the main outer race 20, which is a first member. Step 2
0c is formed. And, in the large diameter portion 20b,
The sub-outer ring 21 which is the third member can be fitted inside. A concave groove 22 having an arc-shaped cross section is formed on the inner peripheral surface of the auxiliary outer ring 21 which is the third peripheral surface and the inner peripheral surface of the small diameter portion 20a.
a, 22b are formed over the entire circumference. The sub outer race 21 has an outer diameter slightly larger than the inner diameter of the large diameter portion 20b in a free state.

When a rolling bearing device to which a preload is applied is manufactured by using the main outer ring 20 and the sub outer ring 21, first, as shown in FIG.
1 is fitted inside the large-diameter portion 20b with a sufficient fitting strength, and as shown in FIG.
2b, a first outer raceway 23 which is a first raceway,
A fourth outer ring track 24 which is a fourth track is formed.

As described above, in a state where the main outer ring 20 and the sub outer ring 21 are assembled, the first and second outer ring tracks 23, 24 are assembled.
Are formed, the roundness of the outer raceways 23, 24 can be made with high accuracy, and the outer raceways 23, 24 and the main outer race 2
The amount of eccentricity with the outer peripheral surface of 0 can be slightly suppressed. Incidentally, the first formed in this manner, the pitch P ₂ between the second outer raceway 23 and 24 is longer than the pitch p ₂ required to apply a predetermined preload (FIG. 3 (E)) (P ₂ > p ₂ ).

Next, as a second step, a pair of inner ring tracks 1, 2
1 (see FIG. 3 (D) described below), the main outer ring 20 and the sub outer ring 2 combined in the first step.
1 and the pair of inner raceways 1, 1 and 1
The second outer raceways 23 and 24 are opposed to each other.

Next, as a third step, the shaft 2 and the main outer ring 20 and the sub outer ring 21 are eccentric as shown in FIG. A predetermined number of balls 5, 5 are inserted into the gap 8 between the outer raceways 23, 24.

Next, as a fourth step, as shown in FIG. 3 (D), the shaft 2 and the main outer ring 20 and the sub outer ring 21 are made concentric, and the pair of inner raceways 1, 1 and A predetermined number of balls 5 inserted between the first and second outer raceways 23 and 24,
5 are arranged at equal intervals in the circumferential direction. In the fourth step, the cages 6, 6 are mounted on the balls 5, 5 arranged at equal intervals.

Finally, as a fifth step, the sub outer race 21 is displaced in the axial direction (left direction in FIG. 3) on the inner peripheral surface of the main outer race 20, thereby forming the second outer race 21 as shown in FIG. one, by shortening the pitch of the second outer ring raceway 23 and 24, the pitch p ₂ required to apply a predetermined preload. In this state,
A predetermined preload is applied to the plurality of balls 5,5. Then, the seals 7 and 7a are attached to complete the rolling bearing device.

In the third embodiment, the first outer raceway 23 is formed directly on the inner peripheral surface of the main outer race 20.
As in the fourth embodiment shown in FIG. 4, a pair of auxiliary outer rings 21 and 21a can be internally fitted to a main outer ring 20A which does not itself have an outer ring raceway. Similarly, in the first and second embodiments, a pair of inner rings 17 and 17b can be externally fitted to the shaft 2 as shown in FIG. 5 showing the fifth embodiment. As described above, when one pair of the sub outer races 21 and 21a and the inner races 17 and 17b is provided, one or both of the sub outer races 21 and 21 are provided at the time of applying the preload.
a, the inner rings 17, 17b are displaced.

Next, in order to appropriately apply a preload, the shaft 1
The method of adjusting the amount of displacement of the inner ring 17 (or the sub outer ring 21) with respect to the small diameter portion 15a (or the large diameter portion 20b of the main outer ring 20) will be described. FIG. 6 shows a first example. When assembling the preloaded rolling bearing device manufactured by the method as shown in FIG.
5 (the left end in FIG. 6) and the outer ring 19
The vibrator 26 is abutted against one end face (the left end face in FIG. 6) of the first bearing, and vibration is applied to the rolling bearing device via the outer ring 19. Further, a vibration sensor 27 is abutted against the other end surface (the right end surface in FIG. 6) of the outer ring 19, so that the resonance frequency of the rolling bearing device can be measured.

The resonance frequency of the rolling bearing device detected by the vibration sensor 27 is input to a controller 30 via an amplifier 28 and an FFT transformer 29 for performing a fast Fourier transform (FFT). ing. The controller 30 controls a pushing device 31 for pushing the inner ring 17 into the small diameter portion 15a of the shaft 15. In the illustrated embodiment, a hydraulic cylinder is used as the pushing device 31. The controller 30 includes the pushing device 3
By controlling the amount or pressure of the pressurized oil fed into the unit 1, the force for pressing the inner ring 17 against the pushing arm 32 of the pushing device 31 is adjusted.

When manufacturing the rolling bearing device, the small-diameter portion 15
When the appropriate preload is applied to the balls 5 and 5 by pushing the inner ring 17 into the a, the pressurized oil is fed to the pushing device 31 while measuring the resonance frequency of the rolling bearing device by the vibration sensor 27. , Inner ring 1 by pushing arm 32
7, the inner ring 17 is press-fitted to the small-diameter portion 15a of the shaft 15. Then, in a state where the resonance frequency substantially coincides with the preset frequency, the feeding of the pressurized oil to the pushing device 31 is stopped, and the press-fitting operation is completed. In this state, a rolling bearing device to which an appropriate preload is applied is completed.

The fact that there is a certain relationship between the resonance frequency of the rolling bearing device and the amount of preload is described in, for example, Japanese Patent Publication No. 2-6170.
As described in Japanese Patent Publication No. 0, it is conventionally known. Therefore, the resonance frequency of the rolling bearing device having the same configuration as the rolling bearing device to be manufactured and provided with an appropriate amount of preload is measured in advance, and the measured value is set in the controller 30. For example, the supply of the pressurized oil to the pushing device 31 is stopped in a state where the preload of the rolling bearing device has reached an appropriate value. The work of applying the proper preload to the rolling bearing device for setting the resonance frequency only needs to be performed once, so even if the work of applying the proper preload becomes troublesome, it does not hinder the efficiency of the manufacturing work. Absent.

As the pushing device 31 for pushing the inner ring 17, an air cylinder or a feed screw device can be used in addition to the hydraulic cylinder as shown.

Next, FIG. 7 shows a second example of a method for adjusting the amount of displacement. A manufacturing device for applying an appropriate preload to a preloaded rolling bearing device manufactured by the method shown in FIG. 5 is provided with a pair of pressing devices 33a and 33b with the outer ring 19 interposed therebetween. I have. In the case of the illustrated embodiment,
An air cylinder is used as each of the pressing devices 33a and 33b, and the controller 34 controls each of the pressing devices 33a and 33b.
The amount or pressure of the compressed air sent to the hopper is controlled. Also, on one end face (the right end face in FIG. 7) of the outer ring 19,
By bringing the probe 36 of the displacement sensor 35 into contact with the outer ring 1
The displacement amount can be freely measured in the axial direction 9 (the left-right direction in FIG. 7). The measured value of the displacement sensor 35 is input to the controller 34.

The controller 34 includes the above-mentioned pressing devices 33a, 3
3b, the inner ring 17b
It also controls the sending of pressure oil to the pushing device 31 for pushing the. That is, at the time of manufacturing the rolling bearing device, when the inner ring 17b is pushed into the shaft 2 to apply an appropriate preload to each of the balls 5, 5, the pair of pressing devices 33a, 33b are alternately operated. While measuring the displacement of the outer ring 19 by the displacement sensor 35 accompanying the operation, the pushing device 3
1 to the inner ring 17b by the pushing arm 32.
By pressing the inner ring 17b, the inner ring 17b is press-fitted to the shaft 2. Then, in a state where the displacement amount substantially matches the preset value, the feeding of the pressurized oil to the pushing device 31 is stopped, and the press-fitting operation is completed.

It is conventionally known that there is a certain relationship between the amount of displacement and the amount of preload when a predetermined load is applied to the rolling bearing device. Therefore, the amount of displacement when a predetermined load is applied to the rolling bearing device having the same configuration as the rolling bearing device to be manufactured and to which an appropriate amount of preload is applied is measured in advance, and the measured value is used as the above value. If set in the controller 34, the supply of the pressurized oil to the pushing device 31 is stopped in a state where the preload of the rolling bearing device has reached an appropriate value.

Next, FIG. 8 shows the small diameter portion 15a of the shaft 15 (or the large diameter portion 2a of the main outer ring 20) in order to apply the appropriate preload.
A third example of a method of adjusting the amount of displacement of the inner ring 17 (or the auxiliary outer ring 21) with respect to 0b) is shown. The holder 37 holding the end of the shaft 15 (the left end in FIG. 8) is rotatably supported by a gas bearing 38. The holder 37 and the shaft 15 are moved by a belt 39 by an electric motor (not shown).
Is driven to rotate. An outer ring 19 provided around the shaft 15 is appropriately detented so as not to rotate with the rotation of the shaft 15. However, the anti-rotation has a structure that does not suppress the vibration of the rolling bearing device. The tracing stylus 41 of the vibration sensor 40 abuts on the outer peripheral surface of the outer ring 19.

In manufacturing the rolling bearing device, when the inner ring 17 is pushed into the small diameter portion 15a of the shaft 15 to apply an appropriate preload to each of the balls 5, 5, the vibration of the rolling bearing device by the vibration sensor 40 is used. Pressure oil is fed into the push-in device 31 while analyzing the characteristics, that is, analyzing the frequency of the sound or vibration of the bearing device. Then, the inner ring 17 is pressed by the pushing arm 32 so that the inner ring 17 is
5 is press-fitted into the small diameter portion 15a. Then, in a state where the vibration characteristics substantially match the preset characteristics, the supply of the pressurized oil to the pushing device 31 is stopped, and the press-fitting operation is completed.

It has been known that there is a certain relationship between the vibration characteristics of a rolling bearing device and the amount of preload. Therefore, if the vibration characteristics of the rolling bearing device having the same configuration as the rolling bearing device to be manufactured and provided with an appropriate amount of preload are analyzed in advance, and this analysis data is set in the controller 30, When the preload of the rolling bearing device reaches an appropriate value, the supply of the pressurized oil to the pushing device 31 is stopped.

Next, FIG. 9 shows that the small-diameter portion 15a of the shaft 15 (or the large-diameter portion 2
A fourth example of a method of adjusting the amount of displacement of the inner ring 17 (or the auxiliary outer ring 21) with respect to 0b) is shown. When manufacturing a preloaded rolling bearing device, a plurality of balls 5,
5 without applying a preload, a pair of pressing devices 33a,
By alternately operating 33b, a load of a predetermined magnitude is applied to the outer ring 19 in the axial direction (the left-right direction in FIG. 9).
The outer ring 19 is displaced in the axial direction, and the displacement sensor 35 measures the amount of displacement of the outer ring 19. The measured value of the displacement sensor 35 is input to the controller 40,
Determines the amount of play in the axial direction of the rolling bearing device based on the measured value. Determining the play amount from the displacement amount when a predetermined load is applied to the outer ring 19 can be easily performed by a conventionally known technique.

Further, the controller 40 controls the pushing device 3
1 is operated to press the inner ring 17b in the axial direction by a length corresponding to the obtained play amount. After the inner ring 17b is pressed in the axial direction, the balls 5, 5 are in a state where an appropriate preload is applied. In this embodiment, the length of pressing the inner ring 17b is strictly controlled.

Next, FIGS. 10 to 11 show the amount of displacement of the inner ring 17 (or the sub-outer ring 21) with respect to the small-diameter portion 15a of the shaft 15 (or the large-diameter portion 20b of the main outer ring 20) in order to apply an appropriate preload. 9 shows a fourth example of an adjusting method. When manufacturing a rolling bearing device to which a preload is applied, the holder 37
By rotating the shaft 2 via the shaft 2 and measuring the rotational torque (loss torque) of the main outer ring 20A that is to rotate together with the shaft 2 by the load sensor 42, the inner ring 17b is pressed by the push-in arm 32. 17b is press-fitted onto the shaft 2. Then, when the loss torque substantially matches the preset value, the pushing arm 32 is stopped, and the press-fitting operation is completed.

It has been known that there is a certain relationship between the loss torque of a rolling bearing device and the amount of preload. Therefore, if the loss torque of the rolling bearing device having the same configuration as that of the rolling bearing device to be manufactured and given an appropriate preload amount is measured in advance, and the measured value is set in the controller, the rolling can be performed. With the preload of the bearing device reaching the appropriate value,
The pushing arm 32 stops.

The preloading method shown in FIGS. 6 to 9 is a method of manufacturing a double row tapered roller bearing device or combining two single row rolling bearings to apply a predetermined preload to each rolling bearing. It can also be used when configuring the rolling bearing device provided.

[0063]

The preloaded rolling bearing device and the method of manufacturing the same according to the present invention are configured as described above.
It is possible to easily and inexpensively manufacture a rolling bearing device provided with a preload capable of performing high-precision rotation support by easily assembling a spindle rotation supporting device. or,
Since the raceway surface and the rolling surface are not damaged during manufacturing, the performance, durability and reliability of the manufactured rolling bearing device are also increased.
Furthermore, since the preload can be adjusted later, an optimum preload can be obtained according to the equipment to be assembled.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention in the order of steps.

FIG. 2 is a sectional view showing the second embodiment in the order of steps.

FIG. 3 is a half sectional view showing the third embodiment in the order of steps.

FIG. 4 is a half sectional view showing the fourth embodiment in the order of steps.

FIG. 5 is a half sectional view showing the fifth embodiment in the order of steps.

FIG. 6 is a sectional view showing a first example of a method for adjusting a preload.

FIG. 7 is a sectional view showing the second example.

FIG. 8 is a sectional view showing the third example.

FIG. 9 is a sectional view showing the fourth example.

FIG. 10 is a half sectional view showing the fifth example.

FIG. 11 is a side view of FIG. 10;

FIG. 12 is a cross-sectional view showing parts and a finished product of a rolling bearing device conventionally considered.

FIG. 13 is a diagram showing a state where the outer raceway and the inner raceway are eccentric in order to insert a ball.

FIG. 14 is a half sectional view showing a first example of a conventional structure.

FIG. 15 is a half sectional view showing the second example.

FIG. 16 is a sectional view showing the third example.

FIG. 17 is a half sectional view showing the fourth example.

FIG. 18 is a sectional view showing the fifth example.

[Explanation of symbols]

 Reference Signs List 1 inner ring track 2 shaft 3 outer ring track 4 outer ring 5 ball 6 cage 7, 7a seal 8 gap 9 ball bearing 10 housing 11 inner ring 12 retaining ring 13 spacer 14 leaf spring 15 shaft 15a small diameter portion 15b large diameter portion 15c step 16 , 16a First inner ring track 17, 17a, 17b Inner ring 18, 18a Second inner ring track 19 Outer ring 20, 20A Main outer ring 20a Small diameter section 20b Large diameter section 20c Stepped section 21, 21a Secondary outer ring 22a, 22b Groove 23 One outer ring track 24 Second outer ring track 25 Holder 26 Vibrator 27 Vibration sensor 28 Amplifier 29 FFT converter 30 Controller 31 Pushing device 32 Pushing arms 33a, 33b Pressing device 34 Controller 35 Displacement sensor 36 Measuring element 37 Holder 38 Gas bearing 39 Belt 40 Vibration sensor 41 Measuring element 42 Load sensor 43 Outer ring Orbit

[Procedure amendment]

[Submission date] August 28, 2000 (2008.2.
8)

[Procedure amendment 1]

[Document name to be amended] Statement

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[Correction method] Change

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[Document Name] Statement

Patent application title: Method of preloading a rolling bearing device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention, assembled in various rotating parts
To the rolling bearing device to support this rotating part
The preload to be applied is restricted to an appropriate range, and the preload
Is used for mass production management .

[ 0002 ]

[Prior art]

[ 0003 ]

[ 0004 ]

[0005] ball bearing for supporting the various rotating parts, to prevent deflection of the whirling motion and axial are used while applying a preload of Aki Shall direction.

[ 0006 ]

[ 0007 ]

[ 0008 ]

[ 0009 ]

[ 0010 ]

[ 0011 ]

[ 0012 ]

[ 0013 ]

[ 0014 ]

[ 0015 ]

[ 0016 ]

[ 0017 ]

[ 0018 ]

[Problems to be solved by the invention]

Effectively prevents whirling motion and axial wobbling
In order to stop it, the rolling bearing device which is a ball bearing as described above
It is necessary to regulate the preload applied to the
The preload applied to the mass-produced rolling bearing device
Calculates efficiently and manages to appropriate preload, preload management bearing device
Requires a method of mass-producing.

[ 0020 ]

[ 0021 ]

[ 0022 ]

The method of preloading a rolling bearing device of the present invention
It was invented in view of such circumstances .

[0024]

SUMMARY OF THE INVENTION A rolling bearing device according to the present invention.
The shaft member having a first inner raceway on the outer peripheral surface
And a part of this shaft member from the first inner ring raceway in the axial direction
The friction that can overcome the axial force based on the preload
Externally supported by a movable interference that generates force,
An inner ring having a second inner ring raceway on the outer peripheral surface, and two rows on the inner peripheral surface
Outer races having outer raceways of
A plurality is provided between each of the first and second inner raceways.
Of the preload of a rolling bearing device with a rolling element
Things.

Preload applied to rolling bearing device as described above
Before applying preload to each rolling element to calculate the amount
In the state where the shaft member and the inner ring are suppressed,
This is achieved by alternately applying loads in both directions with respect to the axial direction.
Of the outer ring in the axial direction,
Measure the amount of displacement.

[0026]

The preloading method for the rolling bearing device according to the present invention as described above.
According to the above, the amount of preload applied to the rolling bearing device can be efficiently increased.
Calculate and manage the preload of mass-produced products.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the object of the preload amount calculation by the method of the present invention
Of the first example of the rolling bearing device,
I will tell. The shaft 15 is, as shown in FIG.
and a large diameter portion 15b which is continuously in the step portion 15c, this
The outer peripheral surface of the large diameter portion 15b of, that form a first inner ring raceway 16 of the deep groove type. Inner ring 17 has a slightly smaller inner diameter than the outer diameter of the small-diameter portion 15a at the free state. The inner ring 17 on the outer peripheral surface, forming a second inner ring raceway 18 of the deep groove type.

When a rolling bearing device including such a shaft 15 and an inner ring 17 is manufactured, first, as a first step, FIG.
As shown in (B), the inner ring 17 is externally fitted to the small-diameter portion 15a of the shaft 15 with sufficient fitting strength (strength that does not shift due to the reaction force of the preload application). And the large diameter portion 1
The pitch P ₁ of the first inner ring raceway 16 and the inner ring 17 the outer peripheral surface of the second inner ring raceway 18 of 5b outer peripheral surface, the pitch p ₁ required to apply a predetermined preload to the rolling bearing apparatus of the completed
It is longer (P ₁ > p ₁ ) than (FIG. 1D).

[0030] Then, as a second step, the first step shaft 15 and the inner ring 17 in combination with, to be inserted inside the circle cylindrical outer ring 19. On the inner circumferential surface of this outer ring 19,
A pair of deep groove outer raceways 43, 43 are formed. Then, the pair of outer raceways 43, 43 and the first and second inner raceways 16, 18 are opposed to each other.

Next, as a third step, is decentered and the shaft 15 and the inner ring 17 and the outer ring 19, outer ring raceway of the upper Symbol 1: 4
3, 43 and the first, larger part between gap over the circumferential direction between the second inner ring raceway 16. And this gap
From big it became part between, in between the gap, inserting a predetermined number of balls 5.

Next, as the fourth step, the pair of outer ring raceways 43, 43 and the first and second predetermined number of balls 5 inserted into between gap between the inner ring raceway 16 Are moved in the circumferential direction, and the balls 5, 5 are arranged at equal intervals in the circumferential direction while the shaft 15 and the inner ring 17 and the outer ring 19 are concentric. At the same time, as shown in FIG. 1 (C), the retainers 6, 6 are attached to the respective ball row portions so that the balls 5, 5 remain at equal circumferential positions. If necessary, seals 7 are mounted on the inner peripheral surfaces of both ends of the outer ring 19. In this state, no preload has yet been applied to the balls 5,5.

Finally, as a fifth step, the inner ring 17 is directed toward the stepped portion 15c, and is displaced in the axial direction (to the left in FIG. 1) on the outer peripheral surface of the shaft 15, whereby the first and second processes are performed. the pitch of the inner ring raceway 16, 18 is shortened, the pitch p ₁ required to impart the predetermined preload. In this state,
A predetermined preload is applied to the plurality of balls 5, 5 to complete a preloaded rolling bearing device. At the time of completion, there is a gap between the stepped portion 15c and the end face of the inner ring 17.

In the rolling bearing device provided with the preload obtained as described above, the preload is applied between the inner peripheral surface of the inner race 17 and the outer peripheral surface of the small diameter portion 15a based on the frictional force of the interference fit. A stopping force greater than the corresponding axial load acts. Therefore, even if the adhesive is not applied between the shaft 15 and the inner ring 17, the inner ring 17 does not move and does not disappear, and the applied preload does not disappear, so that it can be handled as an integrated ball bearing.
For this reason, the work of configuring the bearing portion of the spindle of the VTR or the HDD becomes easy. In addition, since the preload is applied in the axial direction, the rotation of the spindle can be supported with high accuracy.

However, the inner ring 17 can be displaced with respect to the small diameter portion 15a by applying a force in the axial direction larger than the stopping force due to the interference fit. For this reason, if an appropriate force larger than the load is applied to the inner ring 17 and the inner ring 17 is displaced in the axial direction,
The preload applied to the rolling bearing device can be adjusted (increased or decreased) later.

[ 0036 ]

[ 0037 ]

[ 0038 ]

[ 0039 ]

[ 0040 ]

[ 0041 ]

[ 0042 ]

[ 0043 ]

[ 0044 ]

[ 0045 ]

Next, FIG. 2 shows a pair of the preloading method according to the present invention.
4 shows a second example of an elephant rolling bearing device. In this example
In this case, not fitted the inner ring 17,17b pair to the shaft 2
You . Thus, when the inner wheel 17,17B 1 pair provided, upon preloading, displaces the inner wheel 17,17B one or both.

Next, rolling as shown in FIGS.
In order to apply proper preload to the bearing device , this rolling shaft
A method of calculating the preload amount of the receiving device will be described with reference to FIG .

[ 0048 ]

[ 0049 ]

[ 0050 ]

[ 0051 ]

[ 0052 ]

[ 0053 ]

[ 0054 ]

[ 0055 ]

[ 0056 ]

[ 0057 ]

When a rolling bearing device to which a preload is applied is manufactured, a pair of pressing devices 33a and 33b are alternately operated in a state where the preload is not applied to a plurality of balls 5 and 5, respectively. A load of a predetermined magnitude is applied to the outer ring 19 in the axial direction (the left-right direction in FIG. 3 ), the outer ring 19 is displaced in the axial direction, and the displacement sensor 35 measures the displacement of the outer ring 19. The measured value of the displacement sensor 35 is input to the controller 40, and the controller 40 determines the amount of play in the axial direction of the rolling bearing device based on the measured value. Determining the play amount from the displacement amount when a predetermined load is applied to the outer ring 19 can be easily performed by a conventionally known technique. This play amount exists (within the play amount
As long as the clearance is positive).
No pressure is applied. That is, the inner ring 17, 17b
Move in the direction to eliminate the amount, and when the amount of play becomes zero,
When the inner rings 17 and 17b are further moved,
The amount of movement after the change becomes the preload amount. Find the play amount above
The amount of movement of the inner rings 17, 17b after the movement can be easily understood.
Therefore, if the play amount is measured, the rolling bearing device has
The amount of pressure can be calculated.

Therefore, in the illustrated example, the controller 40
Operates the pushing device 31 to push the inner ring 17b in the axial direction by a length corresponding to the amount of play obtained and the amount necessary for applying the preload . After the inner ring 17b is pressed in the axial direction, the balls 5, 5 are in a state where an appropriate preload is applied. In this embodiment, the length of pressing the inner ring 17b is strictly controlled.

[ 0060 ]

[ 0061 ]

[0062] Incidentally, the preload method of rolling bearing of the present invention, the production of double row tapered roller bearing device, or a rolling bearing single-row combination of two rolling bearings imparted with a predetermined preload to the rolling bearings It can also be used to configure the device.

[0063]

The preloading method for a rolling bearing device according to the present invention is as follows.
Because of the configuration described above, it is possible to easily assemble various types of rotation support devices, and to efficiently and efficiently apply a preloaded preloaded rolling bearing device.
Can control production.

[Brief description of the drawings]

FIG. 1 shows a rolling bearing to which a preloading method according to the present invention is applied.
Sectional drawing which shows the 1st example of an order of an assembly process.

FIG. 2 is a sectional view showing the second example in the order of assembly steps.

FIG. 3 is a sectional view showing an embodiment of a preloading method according to the present invention .

[Description of Signs] 2 shaft 5 ball 6 cage 7 seal 15 shaft 15a small diameter portion 15b large diameter portion 15c stepped portion 16 first inner ring track 17, 17b inner ring 18, 18b second inner ring track 19 outer ring 23 first Outer ring track 24 Second outer ring track 31 Pushing device 32 Pushing arm 33a, 33b Pressing device 35 Displacement sensor 36 Measuring element 40 Controller 43 Outer ring track

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Claims (8)

[Claims] A first member having a first peripheral surface and a second member having a second peripheral surface concentric with the first member and opposed to the first peripheral surface; A first trajectory formed on the first peripheral surface, a second trajectory formed on a portion of the second peripheral surface facing the first trajectory, and the second trajectory A third track formed on the second peripheral surface at a portion deviated in the axial direction from the first member having sufficient fitting strength, and concentric with the first and second members. A third member which is supported and has a third peripheral surface facing the second peripheral surface, and a third member formed at a part of the third peripheral surface facing the third track. Four orbits, between the first and second orbits, and between the third and fourth orbits, each including a plurality of balls provided, wherein the first Part of A preloaded rolling bearing device in which an appropriate preload is applied to each of the plurality of balls by adjusting a fitting depth of the third member to a material. 2. A first member having a first peripheral surface, and a second member having a second peripheral surface concentric with the first member and facing the first peripheral surface. A first trajectory formed on the first peripheral surface, a second trajectory formed on a portion of the second peripheral surface facing the first trajectory, and the second trajectory A third track formed on the second peripheral surface at a portion deviated in the axial direction from the first member having sufficient fitting strength, and concentric with the first and second members. A third member which is supported and has a third peripheral surface facing the second peripheral surface, and a third member formed at a part of the third peripheral surface facing the third track. Four orbits, between the first and second orbits, and between the third and fourth orbits, each including a plurality of balls provided, wherein the first Part of By applying a proper preload to the plurality of balls by adjusting the fitting depth of the third member to the material, when manufacturing a preloaded rolling bearing device, the fitting depth Is shifted from the length required for applying the appropriate preload, and in a state where the preload cannot be applied to the ball, the ball is moved between the first track and the second track and between the third track and the fourth track. In between, after inserting a plurality of balls respectively, the third member is axially moved with respect to the first member, so that the fitting depth is set to a length necessary for proper preload. Manufacturing method of the rolling bearing device provided with. 3. A method for manufacturing a rolling bearing device to which a preload is applied according to claim 2, wherein the third member is press-fitted to the first member while measuring the resonance frequency of the rolling bearing device. And a method of manufacturing a preloaded preloaded rolling bearing device, wherein the press-fitting operation of the third member is completed in a state where the resonance frequency substantially coincides with a preset frequency. 4. A method of manufacturing a rolling bearing device to which a preload is applied according to claim 2, wherein an axial load is applied to any one of the first to third members, While measuring the displacement of any one of the members, the third member is press-fitted to the first member, and in a state where the displacement substantially matches a preset value, the third member is A method of manufacturing a rolling bearing device to which a press-fitting operation is completed and to which a preload is applied. 5. The method of manufacturing a rolling bearing device to which a preload is applied according to claim 2, wherein any one of the first, third and second members is rotated by a predetermined amount. Rotate at a speed, press-fit the third member to the first member while measuring the characteristics of the vibration generated during this rotation, and in a state where the characteristics of the vibration substantially match the preset characteristics, A method for manufacturing a rolling bearing device to which a preload is applied, wherein a press-fitting operation of a third member is completed. 6. The method for manufacturing a rolling bearing device to which a preload is applied according to claim 2, wherein the first and third members and the second member are connected to each other without applying a preload to a plurality of balls. A member is displaced by applying a load of a predetermined magnitude in the axial direction to any of the members, and the amount of displacement of the member is measured, and the displacement is measured in the axial direction of the rolling bearing device. A method of manufacturing a preloaded rolling bearing device, wherein after determining a play amount over the third member, the third member is axially pressed by a set length corresponding to the obtained play amount. 7. A method for manufacturing a rolling bearing device to which a preload is applied according to claim 2, wherein any one of the first, third and second members is rotated by a predetermined amount. The third member is press-fitted into the first member while measuring the loss torque while rotating at a speed, and the press-fitting operation of the third member is performed in a state where the loss torque substantially matches a preset value. A method for manufacturing a preloaded preloaded rolling bearing device. 8. The method for manufacturing a rolling bearing device to which a preload is applied according to claim 2, wherein a third member is fitted to the first member, and then a fourth peripheral surface is attached to the third peripheral surface. A method for manufacturing a preloaded rolling bearing device that forms a trajectory.