JP6321987B2 - Rolling bearing device and information recording device - Google Patents

Description

  The present invention relates to a rolling bearing device and an information recording device.

  2. Description of the Related Art Conventionally, a rolling bearing having coaxially arranged inner and outer rings and a rolling element and a shaft fitted to the inner ring of the rolling bearing are provided, and one end of the inner ring is abutted against a flange formed at one end of the shaft. There has been known a rolling bearing device in which the inner peripheral surface of the inner ring and the outer peripheral surface of the shaft are fixed with an adhesive in a state of contact (for example, see Patent Document 1). In the rolling bearing device described in Patent Document 1, a groove that is recessed in the radial direction along the circumferential direction of the shaft is formed in the base portion of the collar portion, and when the shaft is fitted to the inner ring, from between the inner ring and the shaft. Excess adhesive that protrudes is accommodated in the groove.

JP 2011-220427 A

  However, in the rolling bearing device described in Patent Document 1, the adhesive adheres to the end surface of the inner ring when the shaft with the adhesive applied to the outer peripheral surface is fitted into the inner ring and pushed in, and the end surface of the inner ring is attached to the flange of the shaft. The adhesive adhering to the end face may be crushed by abutting against the outer ring, and may protrude from the space between the inner ring and the shaft flange to the outer ring side. In this case, the protruding adhesive is supported by the outer ring and adheres to the inner edge of the shield plate arranged so as to close the annular space between the inner and outer rings, whereby the inner ring and the shield plate are bonded to each other to provide a rolling bearing. Has the disadvantage of causing poor rotation.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a rolling bearing device and an information recording device that prevent a rolling bearing from rotating poorly due to an adhesive that bonds an inner ring and a shaft. To do.

The present invention includes an inner ring and an outer ring arranged coaxially, and a plurality of rolling elements arranged in the annular space between the inner ring and the outer ring at intervals in the circumferential direction, with an interval in the axial direction. Two rolling bearings arranged and a flange projecting in the radial direction, fitted into the inner ring of the two rolling bearings, with the flange being abutted against one end of the inner ring and a shaft member fixed by an adhesive to the inner circumferential surface of the inner ring, the flange portion, the circumferential direction position that corresponds to the outer edge of the inner ring the butted against said one end of one of the inner ring There is provided a rolling bearing device having a stepped portion formed in an annular shape and recessed in the axial direction.

  According to the present invention, when the shaft member having the outer peripheral surface coated with the adhesive is fitted to the inner ring of one of the rolling bearings, the adhesive adheres to the end surface of the inner ring, and the end surface of the inner ring is attached to the flange portion of the shaft. Even if the adhesive adhering to the end surface protrudes from between the inner ring and the flange portion of the shaft to the outer ring side, the protruding adhesive agent can escape to the step portion of the flange portion. As a result, when the cider is supported by the outer ring, the inner ring and the shaft member are bonded to each other by preventing the inner ring and the shield plate from being bonded to each other by the adhesive that protrudes from between the end surface of the inner ring and the collar to the outer ring side. Defective rotation of the rolling bearing due to the adhesive can be prevented.

In the said invention, the said shaft member is good also as having a groove part hollow in a radial direction over the perimeter in the base part of the said collar part.
With this configuration, when the shaft member having the outer peripheral surface coated with the adhesive is fitted to the inner ring of one of the rolling bearings, the excess adhesive is accommodated in the groove portion of the flange portion and protrudes to the outer ring side. Can be more reliably prevented.

  The present invention is attached to any one of the above rolling bearing devices, a base member to which the shaft member of the rolling bearing device is fixed, a magnetic recording medium capable of recording magnetic information, and the outer ring of the rolling bearing, Provided is an information recording apparatus comprising a swing arm for recording magnetic information on the magnetic recording medium and a drive unit for driving the swing arm.

  According to the present invention, it is possible to stably swing the swing arm around the shaft member with respect to the base member by the rolling bearing device. Accordingly, the drive unit can stably reciprocate the swing arm with respect to the magnetic recording medium, and magnetic information can be recorded with high accuracy.

  According to the present invention, it is possible to prevent the rotation failure of the rolling bearing due to the adhesive that bonds the inner ring and the shaft.

1 is a schematic configuration diagram of a hard disk drive device including a pivot device according to a first embodiment of the present invention. It is a longitudinal cross-sectional view of the rolling bearing apparatus of FIG. It is a longitudinal cross-sectional view which shows a mode that a shaft is fitted to the 1st rolling bearing of the rolling bearing apparatus of FIG. It is a figure which shows a mode that the 1st rolling bearing of FIG. 3 was pushed in the axial direction. It is a figure which shows a mode that the inner ring | wheel of the 1st rolling bearing of FIG. 4 was abutted against the flange part of the shaft. It is a longitudinal cross-sectional view which shows the rolling bearing apparatus in which the inner ring | wheel of a 1st rolling bearing has a taper-shaped recessed part as a 1st modification of 1st Embodiment of this invention. FIG. 6 is a longitudinal sectional view showing a rolling bearing device in which an inner ring of a first rolling bearing has an R-shaped recess as a first modification of the first embodiment of the present invention. It is a longitudinal cross-sectional view of the rolling bearing apparatus which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the rolling bearing apparatus which concerns on the modification of 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the rolling bearing apparatus which concerns on the modification of each embodiment of this invention.

[First Embodiment]
Hereinafter, a rolling bearing device and an information recording device according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a hard disk drive device (information recording device) 100 according to the present embodiment includes a base housing (base member) 1 having a substantially rectangular box shape, a rolling bearing device 3 fixed to the base housing 1, A swing arm 5 slidably supported by the rolling bearing device 3 with respect to the base housing 1, a drive unit 7 such as a voice coil motor that swings the swing arm 5, and a magnetic recording medium 9 capable of recording magnetic information It has.

  A magnetic head 6 for writing magnetic information on the magnetic recording medium 9 and reading magnetic information recorded on the magnetic recording medium 9 is attached to the tip of the swing arm 5. Further, a bearing fitting hole (not shown) for fitting the rolling bearing device 3 is provided at the base end portion of the swing arm 5.

  As shown in FIG. 2, the rolling bearing device 3 includes a shaft (shaft member) 31, a first rolling bearing 10 and a second rolling bearing that are fitted in the shaft 31 and arranged coaxially with an interval in the axial direction. 20 and a spacer 33 sandwiched between the rolling bearings 10 and 20 in the axial direction.

  The shaft 31 is formed in a hollow and substantially cylindrical shape, and has a flange-like flange portion (a flange portion) 31a that protrudes radially outward over the entire circumference at one end in the axial direction. The shaft 31 has a flange portion 31 a fixed to the base housing 1 and is disposed along the central axis C.

  The first rolling bearing 10 and the second rolling bearing 20 are fitted into the shaft 31 in order from the flange portion 31a side. Further, on the outer peripheral surface of the shaft 31, adhesive reservoirs 31b and 31c are formed which are recessed inward in the radial direction at positions where the first rolling bearing 10 and the second rolling bearing 20 are fitted.

  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. A rolling element 15, a retainer 17 that holds each rolling element 15 in a rollable manner, and a shield plate 19 disposed so as to close one end in the axial direction of the annular space between the inner and outer rings are provided.

A deep groove type or angular type inner ring raceway is provided on the outer peripheral surface of the inner ring 11, and a deep groove type or angular type outer ring raceway is provided on the inner peripheral surface of the outer ring 13.
Each rolling element 15 is arranged at equal intervals in the circumferential direction by a retainer 17, and is held between the inner ring raceway of the inner ring 11 and the outer ring raceway of the outer ring 13 so as to be able to roll.

  The inner ring 11 has a recess 11a that is recessed in the axial direction along the inner peripheral edge at one end in the axial direction. The recessed part 11a is formed by removing the corner | angular part of the inner periphery of the inner ring | wheel 11 over the whole area of the circumferential direction. That is, the inner ring 11 has a stepped shape in which the inner peripheral surface at one end in the axial direction spreads outward in the radial direction by the recess 11a. The inner ring 11 is configured such that the end surface in the axial direction in which the concave portion 11 a is formed is abutted against the flange portion 31 a of the shaft 31.

The outer ring 13 has a recess 13a that is recessed radially outward along the inner peripheral edge at one end in the axial direction. The recessed part 13a is formed by removing the corner | angular part of the inner periphery of the outer ring | wheel 13 over the whole area of the circumferential direction. That is, the outer ring 13 has a stepped shape in which the inner peripheral surface at one end in the axial direction spreads outward in the radial direction by the recess 13a. The concave portion 13 a has a wall surface inclined inward in the radial direction so as to taper toward the end face in the axial direction of the outer ring 13, and holds the shield plate 19 by fitting the outer edge portion of the shield plate 19. Be able to.
The inner ring 11 and the outer ring 13 are combined so that the concave portion 11a and the concave portion 13a are arranged in the same axial direction.

  The shield plate 19 is, for example, an annular plate-shaped member made of metal or plastic, and can be manufactured by press molding or resin molding. The shield plate 19 has an outer edge held by the recess 13 a of the outer ring 13, and the inner edge is disposed with a slight gap in the radial direction between the inner ring 11 and the inner ring 11.

  The second rolling bearing 20 includes an inner ring 21 and an outer ring 23, a plurality of rolling elements 25, a retainer 27, and a shield plate 29. The second rolling bearing 20 has the same configuration as the first rolling bearing 10 except that the inner ring 21 is not formed with a recess and has a uniform thickness along the axial direction. Yes. In the figure, reference numeral 23 a indicates a recess for holding the shield plate 29 of the outer ring 13.

  These rolling bearings 10 and 20 are arranged with the shield plates 19 and 27 spaced apart from each other in the axial direction, the shaft 31 is fitted to the inner rings 11 and 21, and the outer rings 13 and 23 are respectively fitted to the bearings of the swing arm 5. It is designed to be fitted into the hole.

  The spacer 33 has, for example, a ring shape whose outer diameter is substantially equal to the outer diameter of the outer rings 13 and 23 and whose inner diameter is slightly smaller than the inner diameter of the outer rings 13 and 23. In the spacer 33, one end surface in the axial direction of the outer ring 13 of the first rolling bearing 10 is abutted against one end surface in the axial direction, and the other end surface in the axial direction is in the axial direction of the outer ring 23 of the second rolling bearing 20. One end surface is abutted. Thus, a gap corresponding to the axial thickness of the spacer 33 is formed between the inner rings 11 and 21 of the rolling bearings 10 and 20.

  In the rolling bearing device 3 configured in this manner, the inner rings 11 and 21 and the shaft 31 are in a state where the inner ring 21 is pressed in the axial direction so that the inner rings 11 and 21 of the rolling bearings 10 and 20 are close to each other. Bonded by an adhesive G. As a result, preload is applied to the rolling bearings 10 and 20, and the state where the inner rings 11 and 21 and the outer rings 13 and 23 and the rolling elements 15 and 25 are in contact with each other without any gap is maintained. Further, the outer rings 13 and 23 of the rolling bearings 10 and 20 and the inner peripheral surface of the bearing fitting hole of the swing arm 5 are also joined by the adhesive G. Examples of the adhesive G include an anaerobic adhesive and a thermosetting adhesive.

Next, the assembly process of the rolling bearing device 3 will be described.
First, as shown in FIG. 3, adhesive G is applied to the fitting portion of the inner ring 11 of the first rolling bearing 10 on the outer peripheral surface of the shaft 31, and the inner ring 11 and the shaft 31 of the first rolling bearing 10 are connected. The inner ring 11 is pushed toward the flange portion 31a of the shaft 31 by fitting. Adhesive G is applied in a sufficient amount to the outer peripheral surface of shaft 31 in order to ensure adhesive strength.

  At this time, as shown in FIG. 4, as the inner ring 11 is pushed in, excess adhesive G flows into the adhesive reservoir 31 b of the shaft 31, and the adhesive G is applied to the entire fitting portion of the inner ring 11 on the outer peripheral surface of the shaft 31. Go around. Then, as shown in FIG. 5, the inner ring 11 is pushed in until the one end surface in the axial direction of the inner ring 11 hits the flange portion 31 a of the shaft 31, and the inner ring 11 and the shaft 31 are positioned.

  In this case, since the inner ring 11 has the recess 11a at the inner peripheral edge of one end, excess adhesive G is accommodated in the recess 11a, and the adhesive G is applied to the end surface of the inner ring 11 that is abutted against the flange portion 31a of the shaft 31. The inner ring 11 can be pushed in without being attached. Thereby, it is possible to prevent the adhesive G from protruding from between the end face of the inner ring 11 and the flange portion 31 a and spread to the outer ring 13 side, and to prevent the adhesive G from adhering to the inner edge portion of the shield plate 19. .

  Thereby, it can prevent that the inner ring | wheel 11 and the shield board 19 are adhere | attached with the adhesive agent G, and the 1st rolling bearing 10 raise | generates a rotation defect. Moreover, it can prevent that the adhesive agent G protrudes and the grease component which flows out from the inside of the 1st rolling bearing 10 is mixed, and it can prevent causing the increase in outgas by the hardening failure of the adhesive agent G.

  Further, even when the R-shaped fillet remains at the base portion of the flange portion 31a, the fillet portion of the flange portion 31a is accommodated in the concave portion 11a of the inner ring 11, and the inner ring 11 abutted against the flange portion 31a. Can be prevented from being joined in an inclined posture by the fillet portion. Therefore, it is not necessary to form a necking (groove) for flattening the fillet at the base portion of the flange portion 31a in the shaft 31. As a result, the shaft 31 can be machined using a machining tool with a large R shape at the tip, and the shaft 31 can be produced at low cost by reducing the consumption of the machining tool and reducing the machining cost.

Next, the spacer 33 is disposed to abut against one end of the outer ring 13 in the axial direction.
Subsequently, an adhesive G is applied to a fitting portion of the inner ring 21 of the second rolling bearing 20 on the outer peripheral surface of the shaft 31, the inner ring 21 and the shaft 31 are fitted, and the inner ring 21 is pushed toward the spacer 33. Go.

  Similar to the first rolling bearing 10, as the inner ring 21 is pushed in, the adhesive G spreads over the entire fitting portion of the inner ring 21 on the outer peripheral surface of the shaft 31 while the excess adhesive G is released to the adhesive reservoir 31c. Then, the inner ring 21 is pushed in until the one end in the axial direction of the inner ring 21 abuts against the spacer 33 to position the inner ring 21 and the shaft 31.

  Subsequently, before the adhesive G between the inner ring 21 and the shaft 31 of the second rolling bearing 20 is cured, a preload is applied to the rolling bearings 10 and 20. Since the inner ring 11 of the first rolling bearing 10 is abutted against the flange portion 31 a and a gap corresponding to the axial length of the spacer 33 is formed between the inner rings 11 and 21, the inner ring 21 is brought close to the inner ring 11. Preload can be applied to the rolling bearings 10 and 20 simply by pressing in the direction. With the preload applied, the adhesive G between the inner ring 21 and the outer peripheral surface of the shaft 31 is cured to fix them.

  Thereby, the clearances between the inner rings 11 and 21 and the outer rings 13 and 23 of the two rolling bearings 10 and 20 and the respective rolling elements 15 are eliminated by a simple method, thereby ensuring the rigidity of the rolling bearings 10 and 20 and improving the rotation accuracy. be able to. In addition, since the preload is maintained by bonding, it is possible to prevent the preload from being lost and to prevent the rotation accuracy of the rolling bearings 10 and 20 from being deteriorated.

Next, the operation of the rolling bearing device 3 and the hard disk drive device 100 will be described.
The rolling bearing device 3 according to the present embodiment is fixed to the shaft 31 by rolling the rolling elements 15 and 25 between the inner rings 11 and 21 and the outer rings 13 and 23 of the rolling bearings 10 and 20, respectively. The outer rings 13 and 23 are rotated with respect to the inner rings 11 and 21, respectively.

  Thereby, in the hard disk drive device 100 according to the present embodiment, the swing arm 5 fixed to the outer rings 13 and 23 of the rolling bearings 10 and 20 by the operation of the drive unit 8 is fixed to the base housing 1 in which the shaft 31 is fixed. Is swung around the central axis C. As the swing arm 5 swings, the magnetic head 6 is reciprocated on the magnetic recording medium 9.

  For example, when the swing arm 5 is operated at a high speed by the drive unit 8, the magnetic head 6 is instantaneously moved to data recorded at a predetermined position on the magnetic recording medium 9, and recording is performed on the magnetic recording medium 9 by the magnetic head 6. It is possible to read and write magnetic information.

  As described above, according to the rolling bearing device 3 and the hard disk drive device 100 according to the present embodiment, when the inner ring 11 is pushed in by fitting the inner ring 11 and the shaft 31 of the first rolling bearing 10 together. The adhesive G is accommodated in the concave portion 11a to prevent the adhesive G from adhering to the end surface of the inner ring 11, and the adhesive G is applied between the flange portion 31a of the shaft 31 and the end surface of the inner ring 11 abutted against the flange 31a. It is possible to prevent it from protruding and spreading to the outer ring 13 side. Thereby, the rotation failure of the 1st rolling bearing 10 resulting from the adhesive G which adhere | attaches the inner ring | wheel 11 and the shaft 31, and the increase in outgas can be prevented.

  In the present embodiment, the shaft 31 may have a necking (groove portion) that is recessed in the radial direction over the entire circumference at the base portion of the flange portion 31a. By doing in this way, the adhesive G accommodated in the recessed part 11a of the inner ring | wheel 11 can be accommodated also in the necking of the flange part 31a, and it can prevent more reliably that the adhesive G protrudes to the outer ring | wheel 13 side.

  In the present embodiment, the inner ring 21 of the second rolling bearing 20 does not have a recess and is formed to have a uniform thickness along the axial direction. However, the inner ring 21 of the second rolling bearing 20 is also formed. It is good also as being formed in the shape similar to the inner ring | wheel 11 of the 1st rolling bearing 10, ie, the shape which has the recessed part 11a or the notch 11b in the inner edge part of the end of an axial direction. By making the inner ring 11 and the inner ring 21 have the same shape, productivity can be improved.

This embodiment can be modified as follows.
That is, in the present embodiment, the inner ring 11 of the first rolling bearing 10 has the recess 11a. As a first modification, as shown in FIGS. 6 and 7, the inner ring of the first rolling bearing 10 is provided. 11 may have a notch 11b formed by scraping off the corner of the inner peripheral edge at one end over the entire circumferential direction.

  The notch 11 b is formed by cutting larger than a chamfer (not shown) formed in the outer ring 13. For example, the notch 11 b is a cavity that can accommodate excess adhesive G between the inner ring 11 and the outer peripheral surface of the shaft 31. It is desirable that the size be such that the portion is formed over the entire area in the circumferential direction.

  Further, as shown in FIG. 6, the notch 11b may have a taper shape inclined in a taper shape from one axial end surface to the inner peripheral surface of the inner ring 11, or as shown in FIG. It is good also as having R shape which inclines in R shape from one end surface of 11 axial directions to an inner peripheral surface.

  According to this modification, when the inner ring 11 of the first rolling bearing 10 and the shaft 31 are fitted, the entire region in the circumferential direction is formed between the notch 11 b formed at one end of the inner ring 11 and the outer peripheral surface of the shaft 31. A cavity is formed over. Therefore, the adhesive G can be accommodated in the hollow portion, and the inner ring 11 can be pushed in without attaching the adhesive G to the end face of the inner ring 11 abutted against the flange portion 31 a of the shaft 31.

  Accordingly, the adhesive G prevents the adhesive G from protruding from the space between the flange portion 31a of the shaft 31 and the end surface of the inner ring 11 abutted against the flange 31a and spreading to the outer ring 13 side, and bonds the inner ring 11 and the shaft 31 together. The rotation failure of the 1st rolling bearing 10 resulting from this and the increase in outgas can be prevented.

[Second Embodiment]
Next, a rolling bearing device and an information recording device according to a second embodiment of the present invention will be described.
In the rolling bearing device 103 according to the present embodiment, instead of the recess 11a and the notch 11b of the inner ring 11, as shown in FIG. 8, the shaft 31 has one end of the inner ring 11 of the first rolling bearing 10 at the flange 31a. It differs from 1st Embodiment by the point which has the step part 31d dented in the axial direction along the circumferential direction in the abutted position. The configuration of the hard disk drive device (information recording device) 100 is the same as that of the first embodiment.
In the following, portions having the same configuration as those of the rolling bearing device 3 and the hard disk drive device 100 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The step portion 31d is formed from a position where one end of the inner ring 11 abuts on the flange portion 31a of the shaft 31 to the outer edge portion. That is, the flange portion 31a of the shaft 31 is formed with a thick base portion by the step portion 31d, and has a thin outer portion in the radial direction from a position where one end of the inner ring 11 is abutted.

The shaft 31 has a necking (groove portion) 31e that is recessed in the radial direction over the entire circumference at the base portion of the flange portion 31a.
The inner ring 11 of the first rolling bearing 10 has a uniform thickness along the axial direction, like the inner ring 21 of the second rolling bearing 20.

According to the rolling bearing device 103 configured as described above, the adhesive G adheres to the end surface of the inner ring 11 when the inner ring 11 of the first rolling bearing 10 is fitted to the shaft 31 and the inner ring 11 is pushed.
In this case, when the end surface of the inner ring 11 is abutted against the flange portion 31a of the shaft 31, the adhesive G adhering to the end surface can be released to the necking 31e of the flange portion 31a.

  Further, even if the adhesive G adhering to the end surface of the inner ring 11 is crushed and protrudes between the inner ring 11 and the flange portion 31a of the shaft 31 to the outer ring 13 side, the protruding adhesive G is transferred to the step portion 31d. It can escape and keep away from the inner edge part of the shield board 19, and it can prevent that the inner ring | wheel 11 and the shield board 19 adhere | attach. Thereby, the rotation failure of the 1st rolling bearing 10 resulting from the adhesive agent G which adhere | attaches the inner ring | wheel 11 and the shaft 31 can be prevented.

  In the present embodiment, the step portion 31d extends outward in the radial direction from the position where one end of the inner ring 11 in the flange portion 31a is abutted to the outer edge portion. However, the step portion includes the inner ring 11 and the shaft. It suffices if the adhesive G that protrudes from the space between the flange portion 31 a of 31 and the outer ring 13 side can be accommodated and away from the inner edge portion of the shield plate 19.

  Therefore, for example, as shown in FIG. 9, the shaft 31 is formed in an annular shape along the circumferential direction in the vicinity of a position corresponding to the outer edge portion of one end in the axial direction of the inner ring 11 abutted against the flange portion 31 a. You may have the slit (step part) 31f. In this case, the slit 31f may have a width and a depth that can accommodate the adhesive G that protrudes from the inner ring 11 and the flange portion 31a of the shaft 31 to the outer ring 13 side.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention. For example, the present invention is not limited to those applied to the above-described embodiments and modifications, and may be applied to embodiments that appropriately combine these embodiments and modifications, and is not particularly limited. .

  For example, in each of the above-described embodiments, the configuration in which each rolling bearing 10, 20 does not include an outer fitting member has been described. However, as shown in FIG. 10, the outer rings 13, 23 of the rolling bearing 10, 20, are provided. It is good also as providing the substantially cylindrical sleeve (outer fitting member) 19 which has the fitting hole 19a to fit. In this case, a spacer 33 may be adopted, and as shown in FIG. 10, the sleeve 19 has a spacer portion 19b protruding radially inward over the entire circumferential direction on the inner peripheral surface of the fitting hole 19a. It may be.

  In each of the above embodiments, the outer rings 13 and 23 of the rolling bearings 10 and 20 and the bearing fitting holes of the swing arm 5 are also joined by the adhesive G. However, the bearings of the outer rings 13 and 23 and the swing arm 5 are also joined. About a fitting hole, it is good also as joining with another adhesive different from the adhesive G used for adhesion | attachment with the shaft 31 and the inner rings 11 and 21. FIG. The bearing fitting holes of the outer rings 13 and 23 and the swing arm 5 may be fixed by press-fitting or tolerance ring instead of adhesive fixing.

1 Base housing (base member)
3,103 Rolling bearing device 5 Swing arm 10 First rolling bearing 11, 21 Inner ring 11a Recess 11b Notch 13, 23 Outer ring 15, 25 Rolling element 20 Second rolling bearing 31 Shaft (shaft member)
31d, 31f Step 31e Necking (groove)
100 Hard disk drive device (information recording device)
G adhesive

Claims (3)

The inner ring and the outer ring arranged coaxially, and a plurality of rolling elements arranged in the annular space between the inner ring and the outer ring at intervals in the circumferential direction, are arranged with an interval in the axial direction 2 With two rolling bearings,
A flange projecting in the radial direction, fitted to the inner ring of the two rolling bearings, with the flange being abutted against one end of one of the inner rings, and an adhesive on the inner peripheral surface of these inner rings A shaft member fixed by
The flange portion, the one of the inner ring of the one end abutting been rolling bearing having a stepped portion recessed in the axial direction is formed in an annular shape along the circumferential direction at a position that corresponds to the outer edge of the inner ring . The rolling bearing device according to claim 1 , wherein the shaft member has a groove portion that is recessed in the radial direction over the entire circumference at a base portion of the flange portion. A rolling bearing device according to claim 1 or 2 ,
A base member to which the shaft member of the rolling bearing device is fixed;
A magnetic recording medium capable of recording magnetic information;
A swing arm that is attached to the outer ring of the rolling bearing and records magnetic information on the magnetic recording medium;
An information recording apparatus comprising: a drive unit that drives the swing arm.

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