JP2006242292A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce transmission of vibration to an E block (swing arm). <P>SOLUTION: This bearing device is used for a swing arm provided for a hard disc drive device. In the bearing device, the swing arm 20 (E block 10) is swingably journaled through rolling bearings 28 and 30 mounted to a shaft 26; viscoelastic bodies 34 and 36 are intervened in at least one mounting part within mounting parts between inner rings 28b and 30b of the respective rolling bearings and the shaft, mounting parts between outer rings 28a and 30a of the respective rolling bearings and a housing, and mounting parts between the outer rings or the housing and the swing arm. In this case, at least rubber and a synthetic resin are included in a formation material of the viscoelastic bodies. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bearing device used in a portion that swings at a high speed and, more particularly, to a bearing device for a swing arm provided in a hard disk drive device (HDD device).

  Conventionally, various bearing devices for swingably supporting a swing arm are incorporated in the HDD device. For example, FIG. 13 shows a configuration example of a 3.5-inch HDD device. The bearing device includes two rolling bearings 6 and 8 between the shaft 2 and the housing 4 along the axial direction. Configured. A spacer 4a protruding from the inner periphery of the housing 4 is inserted between the two rolling bearings 6 and 8, and each outer ring 6a and 8a is in contact with the spacer 4a. A predetermined preload is applied to the two rolling bearings 6 and 8 by pressing the inner rings 6b and 8b.

  In this case, the housing 4 is configured to be swingable around the shaft 2 via the two rolling bearings 6 and 8, and an E block 10 in which a plurality of swing arms 10 a are integrated is fixed to the outer periphery of the housing 4. Yes. Therefore, by driving the E block 10 with a voice coil (not shown), the E block 10 (the plurality of swing arms 10a) can be slightly swung.

  For example, FIG. 14 shows a configuration example of a 2.5-inch HDD device. The bearing device includes two rolling bearings 16 along the axial direction between the shaft 12 and the housing 14. , 18. A spacer 14a projecting from the inner periphery of the housing 14 is inserted between the two rolling bearings 16 and 18, and each outer ring 16a and 18a is in contact with the spacer 14a. A predetermined preload is applied to the two rolling bearings 16 and 18 by pressing the inner rings 16b and 18b.

  In this case, the housing 14 is configured to be swingable around the shaft 12 via two rolling bearings 16 and 18, and a plurality of swing arms 20 are fixed to the outer periphery of the housing 14. As a method for fixing the swing arm 20, a nut 24 is fastened to the housing 14 with a spacer 22 interposed between the swing arms 20, so that the nut 24 and the outward flange 14f of the housing 14 are interposed. The plurality of swing arms 20 are fixed in a sandwiched state. In this configuration, the swing arm 20 can be slightly swung by driving the swing arm 20 with a voice coil (not shown).

  By the way, in each HDD apparatus described above, the shaft 2 (12) and the inner rings 6b and 8b (16b and 18b), the outer rings 6a and 8a (16a and 18a) and the housing 4 (14), the housing 4 (14) and the E block 10 The (swing arm 20) is fixed in direct contact with each other. In such a fixing method, for example, vibrations generated from the shaft 2 (12) itself or vibrations generated from the rolling bearings 6 and 8 (16, 18) during driving of the HDD device (for example, rolling elements in the raceway grooves). In some cases, vibration generated at the time of collision or the like is transmitted to the E block 10 (swing arm 20) as it is.

  A recording / reproducing head (not shown) is mounted at the tip of the E block 10 (swing arm 20), and information is recorded by swinging the head along a track of a disk (not shown). Recording and playback are performed. Therefore, as described above, when various vibrations are transmitted to the E block 10 (swing arm 20) as they are, the head also vibrates, making it difficult to accurately follow the head along the track. In that case, information may not be recorded or reproduced accurately.

As a method for solving such a problem, a method of fixing with an anti-vibration material interposed (for example, Patent Document 1) can be considered. However, no method has been proposed in the past for incorporating such a vibration isolator into the HDD device.
JP 2000-120669 A

  An object of the present invention is to provide a bearing device that can reduce transmission of vibration to an E block (swing arm).

  In order to achieve such an object, the present invention is a bearing device for a swing arm provided in a hard disk drive device, and the bearing device can swing the swing arm via a rolling bearing attached to a shaft. At least one of a mounting portion between the inner ring and the shaft of each rolling bearing, a mounting portion between the outer ring and the housing of each rolling bearing, and a mounting portion between the outer ring or the housing and the swing arm. A viscoelastic body is interposed in the mounting portion. In this case, the material for forming the viscoelastic body includes at least rubber and synthetic resin.

  According to the bearing device of the present invention, transmission of vibration to the E block (swing arm) can be reduced by interposing a viscoelastic body in at least one of the mounting portions.

The bearing device of the present invention will be described below with reference to the accompanying drawings.
The present invention assumes a swing arm bearing device provided in a hard disk drive device (HDD device), and the configuration of the HDD device is the same as that of each device described above (FIGS. 13 and 14). Therefore, the description is omitted.

FIG. 1 shows a configuration example of a bearing device according to the first embodiment of the present invention.
In the bearing device of the present embodiment, two rolling bearings 28 and 30 are mounted on the outer periphery of the shaft 26 with the side surfaces of the outer rings 28a and 30a in contact with each other. In this case, for example, after the inner ring 30b of one rolling bearing 30 is applied to the outward flange 26f of the shaft 26, the inner ring 28b of the other rolling bearing 28 is pressed and the inner ring 28b is bonded to the shaft 26, thereby The rolling bearings 28 and 30 are maintained in a state where a predetermined preload is applied. Further, the above-described E block 10 (swing arm 20) is mounted on the outer periphery of the two outer rings 28a, 30a, and between the outer periphery of each outer ring 28a, 30a and the inner diameter portion of the E block 10 (swing arm 20). A viscoelastic body is interposed in the mounting portion.

  In such a configuration, at least one groove 32 (two grooves in the drawing) is continuously formed in the circumferential direction on the outer periphery of each outer ring 28a, 30a, and an annular viscoelasticity is formed in each groove 32. A body 34 (a viscoelastic body having a circular cross section) is fitted therein. Further, a viscoelastic body 36 (viscoelastic body having a rectangular cross section) is provided on the outer periphery of each outer ring 28a, 30a so as to sandwich the inner diameter portion of the E block 10 (swing arm 20) from both sides (both sides along the axial direction). Are continuously provided in the circumferential direction.

  The grooves 32 are not necessarily formed continuously in the circumferential direction, and may be formed intermittently. In this case, it is necessary to adjust the length of the viscoelastic body 34 so as to be fitted into the intermittently formed groove 32. Further, the groove 32 is not necessarily formed in the circumferential direction, and may be formed continuously or intermittently in the axial direction (direction crossing the circumferential direction). Furthermore, the shape of the viscoelastic body 34 fitted in the groove 32 is not limited to a circular cross section, and an arbitrary shape such as an elliptical cross section or a rectangular cross section can be applied. Furthermore, since it is only necessary to form a gap between the outer circumferences of the outer rings 28a and 30a and the inner diameter portion of the E block 10 (swing arm 20) so that neither of them contacts the metal, the viscoelastic body fitted into the groove 32 is sufficient. The size (for example, diameter, cross-sectional area) of 34 is not particularly limited. On the other hand, the viscoelastic bodies 36 standing on both sides of the inner diameter portion of the E block 10 (swing arm 20) are not necessarily formed continuously in the circumferential direction, and may be formed intermittently.

  In addition, as a material for forming the viscoelastic bodies 34 and 36, for example, rubber or synthetic resin can be applied. In this case, for example, vinylidene fluoride (FKM) fluorine rubber or nitrile rubber (NBR) may be used as the rubber. Further, as the synthetic resin, for example, butyl rubber, polynorbornene, polyvinyl chloride resin, or the like may be used. The characteristics of the viscoelastic bodies 34 and 36 to which a vinylidene fluoride (FKM) fluororubber is applied are, for example, an elastic modulus E with respect to frequency (FIG. 11) and a loss tangent tan δ with respect to frequency (FIG. 12). This is a measurement result when the measurement temperature is 25 ° C. and the material hardness is 80 °.

  As described above, according to the bearing device of the present embodiment, the viscoelastic bodies 34 and 36 are interposed in the mounting portion between the outer periphery of each outer ring 28a and 30a and the inner diameter portion of the E block 10 (swing arm 20). Thus, for example, vibration generated from the shaft 26 itself during driving of the HDD device and vibration generated from the respective rolling bearings 28 and 30 (for example, vibration generated when the rolling element 38 collides with the raceway groove of the inner and outer rings). It is absorbed by the viscoelastic bodies 34 and 36 and attenuates.

  In this case, the vibration is not transmitted to the E block 10 (swing arm 20) as it is without being attenuated as in the prior art. As a result, transmission of vibration to the E block 10 (swing arm 20) can be reduced. As a result, the recording / reproducing head mounted on the tip of the E block 10 (swing arm 20) can be accurately followed along the track of the disk, and information can be accurately recorded and reproduced. It becomes.

Next, a bearing device according to a second embodiment of the present invention will be described with reference to FIG.
The bearing device of the present embodiment is an improvement of the first embodiment described above. Instead of interposing the viscoelastic body 34 in the groove 32, the outer circumference of each outer ring 28a, 30a and the E block 10 (swing arm 20) The viscoelastic body 40 having an L-shaped cross section is interposed between the inner diameter portion and the inner diameter portion. In this case, the viscoelastic body 40 is continuously provided in the circumferential direction so as to sandwich the inner diameter portion of the E block 10 (swing arm 20) from both sides (both sides along the axial direction) on the outer circumference of each outer ring 28a, 30a. The portion 40a is vertically provided, and is interposed between the inner diameter portion of the E block 10 (swing arm 20) and the outer periphery of each outer ring 28a, 30a.

  Note that the viscoelastic body 40 is not necessarily formed continuously in the circumferential direction, and may be formed intermittently. In addition, since it is only necessary to form a gap between the outer circumferences of the outer rings 28a and 30a and the inner diameter portion of the E block 10 (swing arm 20) so that the two do not contact with each other, the size of the viscoelastic body 40 is determined. There is no particular limitation.

  As described above, according to the bearing device of the present embodiment, the transmission of vibrations to the E block 10 (swing arm 20) can be reduced as in the first embodiment described above. Other configurations (including the viscoelastic body forming material) and effects are the same as those in the first embodiment described above, and thus the description thereof is omitted.

Next, a bearing device according to a third embodiment of the present invention will be described with reference to FIG.
The bearing device according to the present embodiment is an improvement of the first embodiment described above, and is viscoelastic at the mounting portion between the outer circumference of each outer ring 28a, 30a and the inner diameter portion of the E block 10 (swing arm 20). A body 42 is interposed. In this case, the viscoelastic body 42 is continuously interposed in the circumferential direction so as to fill a space region between the outer circumference of each outer ring 28a, 30a and the inner diameter portion of the E block 10 (swing arm 20). Further, similarly to the first embodiment, the outer rings 28a and 30a have viscoelasticity so that the inner diameter portion of the E block 10 (swing arm 20) is sandwiched from both sides (both sides along the axial direction) as in the first embodiment. A body 36 (viscoelastic body having a rectangular cross section) is erected continuously in the circumferential direction.

  Note that the viscoelastic body 42 is not necessarily formed continuously in the circumferential direction, and may be formed intermittently. Further, it is only necessary to form a gap between the outer circumferences of the outer rings 28a, 30a and the inner diameter portion of the E block 10 (swing arm 20) so that they do not contact each other, so the size of the viscoelastic body 42 (for example, The thickness is not particularly limited. Further, the viscoelastic body 36 is not necessarily formed continuously in the circumferential direction as in the first embodiment, and may be formed intermittently.

  As described above, according to the bearing device of the present embodiment, the transmission of vibrations to the E block 10 (swing arm 20) can be reduced as in the first embodiment described above. Other configurations (including the viscoelastic body forming material) and effects are the same as those in the first embodiment described above, and thus the description thereof is omitted.

Next, a bearing device according to a fourth embodiment of the present invention will be described with reference to FIG.
The bearing device of the present embodiment is configured by interposing two rolling bearings 28 and 30 along the axial direction between the shaft 26 and the housing 44, and between the rolling bearings 28 and 30. A spacer 44 a is provided so as to protrude from the inner periphery of the housing 44. In this case, for example, after the inner ring 30b of one rolling bearing 30 is applied to the outward flange 26f with the spacer 44a interposed between the outer rings 28a and 30a, the inner ring 28b of the other rolling bearing 28 is pressed. By bonding the inner ring 28b to the shaft 26, the rolling bearings 6 and 8 are maintained in a state where a predetermined preload is applied. Further, the above-described E block 10 (swing arm 20) is mounted on the outer periphery of the housing 44, and the mounting portion between the outer periphery of the housing 44 and the inner diameter portion of the E block 10 (swing arm 20) is viscoelastic. The body is interposed.

  In such a configuration, at least one groove 46 (four grooves in the drawing) is continuously formed in the circumferential direction on the outer periphery of the housing 44, and an annular viscoelastic body 48 (cross section) is formed in each groove 46. A circular viscoelastic body) is fitted. Further, on the outer periphery of the housing 44, viscoelastic bodies 50 and 52 (viscoelastic bodies having a rectangular cross section) are sandwiched from both sides (both sides along the axial direction) of the inner diameter portion of the E block 10 (swing arm 20). It is erected continuously in the circumferential direction. In the present embodiment, one viscoelastic body 50 is interposed in the mounting portion between the outward flange 44f of the housing 44 and the E block 10 (swing arm 20).

  The groove 46 is not necessarily formed continuously in the circumferential direction, and may be formed intermittently. In this case, it is necessary to adjust the length of the viscoelastic body 48 so as to be fitted into the intermittently formed groove 46. The groove 46 is not necessarily formed in the circumferential direction, and may be formed continuously or intermittently in the axial direction (direction transverse to the circumferential direction). Furthermore, the shape of the viscoelastic body 48 fitted into the groove 46 is not limited to a circular cross section, and an arbitrary shape such as an elliptical cross section or a rectangular cross section can be applied. Furthermore, since it is only necessary to form a gap between the outer periphery of the housing 44 and the inner diameter portion of the E block 10 (swing arm 20) so that they do not contact each other, the size of the viscoelastic body 34 fitted into the groove 46 is large. There is no particular limitation on the length (eg, diameter, cross-sectional area).

  On the other hand, the viscoelastic bodies 50 and 52 erected on both sides of the inner diameter portion of the E block 10 (swing arm 20) are not necessarily formed continuously in the circumferential direction, and may be formed intermittently. Further, it is only necessary to form a gap between the outward flange 44f of the housing 44 and the E block 10 (swing arm 20) so that the two do not come into metal contact with each other. The thickness is not particularly limited.

  As described above, according to the bearing device of the present embodiment, the transmission of vibrations to the E block 10 (swing arm 20) can be reduced as in the first embodiment described above. Other configurations (including the viscoelastic body forming material) and effects are the same as those in the first embodiment described above, and thus the description thereof is omitted.

Next, a bearing device according to a fifth embodiment of the present invention will be described with reference to FIG.
The bearing device of the present embodiment is an improvement of the above-described fourth embodiment, and instead of interposing the viscoelastic body 48 (FIG. 4) in the groove 46, the inner diameter portion of the E block 10 (swing arm 20). One of the two viscoelastic bodies 50 and 52 (for example, the viscoelastic body 52) erected on both sides of the two has an L-shaped cross section, and a part 52a of the viscoelastic body 52 is formed on the outer periphery of the housing 44 and the E block 10 ( It is interposed in the mounting part between the inner diameter part of the swing arm 20).

  As in the fourth embodiment described above, the viscoelastic bodies 50 and 52 are not necessarily formed continuously in the circumferential direction, and may be formed intermittently. Further, since it is only necessary to form a gap between the housing 44 and the outward flange 44f and the E block 10 (swing arm 20) so that they are not in metal contact with each other, the size of the viscoelastic bodies 50, 52 (for example, meat The thickness is not particularly limited.

  As described above, according to the bearing device of the present embodiment, the transmission of vibrations to the E block 10 (swing arm 20) can be reduced as in the first embodiment described above. Other configurations (including the viscoelastic body forming material) and effects are the same as those in the fourth embodiment described above, and a description thereof will be omitted.

Next, a bearing device according to a sixth embodiment of the present invention will be described with reference to FIG.
The bearing device of the present embodiment is an improvement of the above-described fifth embodiment, and the housing 44 is also used as the outer ring of the two rolling bearings 28 and 30. In this case, on the inner periphery of the housing 44, raceway grooves 44g are formed at positions facing the raceway grooves 28g, 30g of both inner rings 28b, 30b, and the rolling elements 38 roll between these raceway grooves. It is incorporated freely.
Note that the effects and other configurations of the present embodiment are the same as those of the first and fifth embodiments, and thus description thereof is omitted.

Next, a bearing device according to a seventh embodiment of the present invention will be described with reference to FIG.
The bearing device according to the present embodiment is related to the improvement of the fourth embodiment described above. That is, in the fourth embodiment (FIG. 4), a viscoelastic body is interposed in the mounting portion between the outer periphery of the housing 44 and the inner diameter portion of the E block 10 (swing arm 20). In the embodiment, a viscoelastic body is interposed in the mounting portion between the outer periphery of each of the outer rings 28 a and 30 a of the two rolling bearings 28 and 30 and the inner periphery of the housing 44.
In this case, at least one groove 54 (two grooves in the drawing) is continuously formed in the circumferential direction on the outer circumference of each outer ring 28a, 30a, and an annular viscoelastic body 56 ( A viscoelastic body having a circular cross section is fitted. Further, a viscoelastic body 58 having a rectangular cross section is interposed between the spacer 44a of the housing 44 and the side surfaces of the outer rings 28a and 30a.

  The groove 54 is not necessarily formed continuously in the circumferential direction, and may be formed intermittently. In this case, it is necessary to adjust the length of the viscoelastic body 56 so as to be fitted into the intermittently formed groove 54. The grooves 54 are not necessarily formed in the circumferential direction, and may be formed continuously or intermittently in the axial direction (direction crossing the circumferential direction). Furthermore, the shape of the viscoelastic body 56 fitted into the groove 54 is not limited to a circular cross section, and an arbitrary shape such as an elliptical cross section or a rectangular cross section can be applied. Furthermore, it is only necessary to form a gap between the outer circumferences of the outer rings 28a, 30a and the inner circumference of the housing 44 so that they do not contact each other. Therefore, the size of the viscoelastic body 56 fitted into the groove 54 (for example, , Diameter, cross-sectional area) are not particularly limited. On the other hand, the viscoelastic body 58 interposed between the spacer 44a and the side surfaces of the outer rings 28a and 30a is not necessarily formed continuously in the circumferential direction, and may be formed intermittently.

  As described above, according to the bearing device of the present embodiment, the transmission of vibrations to the E block 10 (swing arm 20) can be reduced as in the first embodiment described above. Other configurations (including the viscoelastic body forming material) and effects are the same as those in the fourth embodiment described above, and a description thereof will be omitted.

Next, a bearing device according to an eighth embodiment of the present invention will be described with reference to FIG.
The bearing device of the present embodiment is an improvement of the above-described seventh embodiment, and instead of interposing the viscoelastic body 56 (FIG. 7) in the groove 54, the spacer 44a and the side surfaces of the outer rings 28a, 30a. The viscoelastic body 58 interposed between the housing 44 and the viscoelastic body 58 has an L-shaped cross section, and a part 58a of the viscoelastic body 58 is interposed between the housing 44 and the outer periphery of each of the outer rings 28a and 30a.

  Note that, as in the seventh embodiment described above, the viscoelastic body 58 is not necessarily formed continuously in the circumferential direction, and may be formed intermittently. Further, since it is only necessary to form a gap between the housing 44 and the outer periphery of each outer ring 28a, 30a so that they do not contact each other, the size (for example, the thickness) of the viscoelastic body 58 is not particularly limited. .

  As described above, according to the bearing device of the present embodiment, the transmission of vibrations to the E block 10 (swing arm 20) can be reduced as in the first embodiment described above. Other configurations (including the viscoelastic body forming material) and effects are the same as those in the seventh embodiment described above, and a description thereof will be omitted.

Next, a bearing device according to a ninth embodiment of the present invention will be described with reference to FIG.
The bearing device of the present embodiment is related to the improvement of the fourth embodiment described above. That is, in the fourth embodiment (FIG. 4), the viscoelastic body is interposed in the mounting portion between the outer periphery of the housing 44 and the inner diameter portion of the E block 10 (swing arm 20). In the embodiment, a viscoelastic body is interposed in the mounting portion between the inner circumference of each of the inner rings 28b, 30b of the two rolling bearings 28, 30 and the outer circumference of the shaft 26.

  In this case, at least one groove 60 (four grooves in the drawing) is continuously formed in the circumferential direction on the outer periphery of the shaft 26, and an annular viscoelastic body 62 (viscous having a circular cross section) is formed in each groove 60. Elastic body) is fitted. Further, a viscoelastic body 64 (viscoelastic body having a rectangular cross section) is provided on the outer periphery of the shaft 26 so as to sandwich both outer rings 28a, 30a of the two rolling bearings 28, 30 from both sides (both sides along the axial direction). It is erected continuously in the circumferential direction. In the present embodiment, one viscoelastic body 64 is interposed in the mounting portion between the outward flange 26 f of the shaft 26 and the inner ring 30 b of the one rolling bearing 30.

  Note that the groove 60 is not necessarily formed continuously in the circumferential direction, and may be formed intermittently. In this case, it is necessary to adjust the length of the viscoelastic body 62 so as to be fitted into the intermittently formed groove 60. Further, the groove 60 is not necessarily formed in the circumferential direction, and may be formed continuously or intermittently in the axial direction (a direction crossing the circumferential direction). Furthermore, the shape of the viscoelastic body 62 fitted into the groove 60 is not limited to a circular cross section, and an arbitrary shape such as an elliptical cross section or a rectangular cross section can be applied. Furthermore, since it is only necessary to form a gap between the outer periphery of the shaft 26 and the inner diameter portion of the E block 10 (swing arm 20) so that the two do not contact each other, the size of the viscoelastic body 62 fitted into the groove 60 is sufficient. There is no particular limitation on the length (for example, the diameter and the cross-sectional area).

  On the other hand, the viscoelastic bodies 64 standing on both sides of the rolling bearings 28 and 30 (both outer rings 28a and 30a) are not necessarily formed continuously in the circumferential direction, and may be formed intermittently. In addition, since it is only necessary to form a gap between the outward flange 26f of the shaft 26 and the outer rings 28a and 30a so that they do not come into metal contact with each other, the size (for example, thickness) of one viscoelastic body 64 is sufficient. Is not particularly limited.

  As described above, according to the bearing device of the present embodiment, the transmission of vibrations to the E block 10 (swing arm 20) can be reduced as in the first embodiment described above. Other configurations (including the viscoelastic body forming material) and effects are the same as those in the fourth embodiment described above, and a description thereof will be omitted.

Next, a bearing device according to a tenth embodiment of the present invention will be described with reference to FIG.
The bearing device of the present embodiment is an improvement of the above-described ninth embodiment. Instead of interposing the viscoelastic body 62 (FIG. 9) in the groove 60, the rolling bearings 28, 30 (both outer rings 28a, 30a The two viscoelastic bodies 64 erected on both sides of the shaft are L-shaped in cross section, and a part 64a of the viscoelastic body 64 is connected to the outer periphery of the shaft 26 and the rolling bearings 28, 30 (both inner rings 28b, 30b). It is interposed in the mounting part between the inner periphery.

  Note that, similarly to the ninth embodiment described above, the viscoelastic body 64 is not necessarily formed continuously in the circumferential direction, and may be formed intermittently. In addition, since it is sufficient that a gap is formed between the shaft 26 and the outward flange 26f and the rolling bearings 28 and 30 (both inner rings 28b and 30b) so that they are not in metal contact with each other, the size of the viscoelastic body 64 (for example, The thickness is not particularly limited.

  As described above, according to the bearing device of the present embodiment, the transmission of vibrations to the E block 10 (swing arm 20) can be reduced as in the first embodiment described above. Note that other configurations (including the material for forming the viscoelastic body) and effects are the same as those in the ninth embodiment described above, and a description thereof will be omitted.

  In the first to tenth embodiments described above, no particular mention was made of the cage and the sealing plate (seal, shield), but the cage and the sealing plate depending on the purpose and environment of use of the bearing device. Needless to say, is incorporated. Further, although the material and size of the components of the bearing device are not particularly mentioned, it goes without saying that the material and size are optimally set according to the purpose and environment of use of the bearing device. Furthermore, in the first to fifth, seventh, and eighth embodiments described above, the inner rings 28b and 30b of the rolling bearings 28 and 30 are configured separately from the shaft 26. May be formed and used also as an inner ring.

The figure which shows the structural example of the bearing apparatus which concerns on the 1st Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 2nd Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 3rd Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 4th Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 5th Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 6th Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 7th Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 8th Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 9th Embodiment of this invention. The figure which shows the structural example of the bearing apparatus which concerns on the 10th Embodiment of this invention. The figure which shows the characteristic (elastic modulus with respect to a frequency) of the viscoelastic body which applied fluororubber. The figure which shows the characteristic (loss tangent with respect to frequency) of the viscoelastic body which applied fluororubber. A configuration example of a 3.5-inch HDD device. A configuration example of a 2.5-inch HDD device.

Explanation of symbols

10 E block 20 Swing arm 26 Shaft
28,30 Rolling bearing
34,36 Viscoelastic body

Claims (2)

A bearing device for a swing arm provided in a hard disk drive device,
The bearing device pivotally supports the swing arm through a rolling bearing attached to the shaft,
At least one mounting portion of the mounting portion between the inner ring and the shaft of each rolling bearing, the mounting portion between the outer ring and the housing of each rolling bearing, or the mounting portion between the outer ring or the housing and the swing arm, A bearing device characterized in that an elastic body is interposed. The bearing device according to claim 1, wherein the forming material of the viscoelastic body includes at least rubber and synthetic resin.

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