JP5245512B2 - Bearing unit and method for manufacturing bearing unit - Google Patents

Description

  The present invention relates to a technology for manufacturing a bearing unit that rotatably supports, for example, a swing arm of a hard disk drive (HDD) device.

  Conventionally, as an HDD (Hard Disk Drive) device using this type of bearing unit, for example, as shown in FIGS. 2A and 2B, a spindle motor 4 for rotating the magnetic disk 2 and a magnetic disk 2 are used. On the other hand, a device having a magnetic head 6 for recording or reading information is known. Here, the magnetic head 6 is attached to the tip of a swing arm 8 that is rotatably supported by a bearing unit J, and a voice coil 10 that rotationally drives the swing arm 8 is provided at the base end. ing. The swing arm 8 is rotatably supported on the base Bs of the HDD device via the bearing unit J. In this case, information is recorded on the magnetic disk 2 by rotating the swing arm 8 while the magnetic disk 2 is rotated and the magnetic head 6 is moved in parallel with the magnetic disk 2, or the magnetic disk 2 is rotated. 2 can read information.

  The bearing unit J used in such an HDD device is configured by fixing a rolling bearing to a fixed member. As an example, a bearing unit J shown in FIG. 2 (c) includes a shaft (fixed member) 12 that is set up on a base Bs, and a rolling bearing (for example, one-end ball bearing) mounted on the shaft 12. 14, the other end side ball bearing 16), and a housing (fixed member) 18 mounted on the two ball bearings 14, 16. That is, the bearing unit J is configured by interposing (mounting) a plurality of rolling bearings between fixed members. In the drawings, a ball bearing using balls as rolling elements is shown as an example of a rolling bearing, but a roller bearing using rollers as rolling elements may be applied instead.

  In such a configuration, the shaft 12 has a cylindrical outer shape, and includes a flange 12f formed on one end side along the circumferential direction, and an annular convex portion on the other end side. 12t is installed. On the other hand, the housing 18 has a shape to which the swing arm 8 can be attached. The housing 18 includes a flange 18f formed along the circumferential direction at one end thereof, and two ball bearings on the inner periphery thereof. An annular spacer 20 interposed between 14 and 16 is fitted.

Here, an example of a manufacturing method of the bearing unit J as described above will be described.
First, the one end side ball bearing 14 is attached to the shaft (fixed member) 12. At this time, the inner ring Rin of the ball bearing 14 is fitted to the shaft 12 and brought into contact with the flange 12f, and the housing (fixed member) 18 is fitted to the outer ring Rout, and then a spacer is provided on the inner periphery of the housing 18. 20 is fitted and applied to the outer ring Rout. Next, the other end side ball bearing 16 is attached to the shaft (fixed member) 12. At this time, the inner ring Rin of the ball bearing 16 is fitted to the shaft 12, the outer ring Rout is brought into contact with the spacer 20, and then the annular convex portion 12 c is attached to the shaft 12. In this assembly process, an optimum preload is applied to the two ball bearings 14 and 16 by a preload setting jig (not shown). Thus, a bearing unit J configured by fixing the ball bearings 14 and 16 between the shaft (fixed member) 12 and the housing (fixed member) 18 can be manufactured.

  By the way, in manufacturing the bearing unit J as described above, the inner ring Rin of the rolling bearing (one end side ball bearing 14 and the other end side ball bearing 16) is fixed to the shaft (fixed member) 12, and the outer ring Rout is connected to the housing ( Various manufacturing techniques are known for the method of fixing to the member 18 to be fixed. As an example, in the manufacturing technique disclosed in Patent Document 1, a high glass transition point is provided in each of a fixing part for fixing the inner ring and the shaft and a fixing part for fixing the outer ring and the housing in an atmosphere in a vacuum environment. By applying (injecting) an ultraviolet curable anaerobic adhesive, adhesive fixing is performed at each fixing portion.

However, in order to apply (inject) the anaerobic adhesive to each of the above-mentioned fixing sites in a vacuum environment, not only a special device suitable for this is required, but also in a vacuum environment. Thus, a process of taking in and out the bearing together with the apparatus is imposed. For this reason, the manufacturing method of the bearing unit is complicated and takes time and labor, and this greatly increases the manufacturing cost.
JP 2003-232376 A

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a technique capable of manufacturing a bearing unit at a low cost by efficiently fixing a bearing to a fixed member. It is to provide.

In order to achieve such an object, the present invention is a method of manufacturing a bearing unit by fixing a fixed member and a bearing with an anaerobic adhesive, and at least the bearing is fixed to the fixed member. The fixed part is provided with a groove formed by recessing a part of the fixed part from other parts, and the fixed member and the bearing are rotated while rotating the fixed member in an atmosphere under an atmospheric pressure environment. An anaerobic adhesive is applied to the fixed portion of the fixed member, a bearing is attached to the fixed member, a temporary bonding step of temporarily bonding the fixed member and the bearing with the anaerobic adhesive, and the fixed member and the bearing In a state where the entire anaerobic adhesive to be temporarily bonded is not completely cured and an uncured part remains in a part thereof, the fixed member and the bearing and the uncured anaerobic adhesive are Higher than the temperature in the atmosphere under atmospheric pressure And left for a predetermined time in an atmosphere of vacuum environment in which the temperature was set to, possess a left step to completely cure the whole of the anaerobic adhesive, and the fixed member in anaerobic adhesive in the temporary bonding step When temporarily bonding the bearing, the bearing is maintained in a state where a predetermined preload is applied by a predetermined preload setting jig. After the preload setting jig is removed, the fixed member and the bearing are left in the standing step. In addition, the uncured anaerobic adhesive is left in a vacuum environment for a predetermined time.
In the present invention, the timing for removing the preload setting jig is set so that the preload setting jig is removed when the anaerobic adhesive is cured to such an extent that the position of the fixed member and the bearing does not shift or move.
In the present invention, the groove is independently formed only in the fixing portion of the fixed member for fixing the bearing, and the annular groove continuous along the circumferential direction is formed on both sides thereof.
In the present invention, among the annular grooves, the sub-grooves positioned so as to face the side ends of the bearings are configured so that the groove shape is substantially V-shaped.
In this case, in the leaving step, the temperature in the atmosphere in a vacuum environment is set to 60 ° C. or less, and the degree of vacuum is set to 5 Torr or less. In addition, after the entire anaerobic adhesive is completely cured in the leaving step, the fixed member and the bearing and the completely cured anaerobic adhesive are baked in a baking environment in which the temperature in the atmosphere in a vacuum environment is increased. The impurities are removed by leaving them in the atmosphere for a predetermined time.
Further, the present invention is a bearing unit manufactured by the above-described manufacturing method, and the bearing unit is installed on the shaft as a fixed member that is set up and installed on the base of the hard disk drive device. And a housing as a fixed member attached to the bearing. The bearing is fixed between the shaft and the housing by an anaerobic adhesive.
In the present invention, the groove is independently formed only in the fixing portion of the fixed member for fixing the bearing, and the annular groove continuous along the circumferential direction is formed on both sides thereof.
In the present invention, among the annular grooves, the sub-grooves positioned so as to face the side ends of the bearings are configured so that the groove shape is substantially V-shaped.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can manufacture a bearing unit at low cost is realizable by fixing a bearing with respect to a to-be-fixed member efficiently.

  Hereinafter, a method for manufacturing a bearing unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, for the same configuration as the above-described bearing unit J (FIG. 2), the same reference numerals as those used for the configuration are attached to the drawings used in this embodiment. Therefore, the description is omitted.

  In the manufacturing method of the present embodiment, the above-described fixed member (the shaft 12 and the housing 18) and the above-described rolling bearing (the one-end side ball bearing 14 and the other-end side ball bearing 16) are fixed with an anaerobic adhesive. And a temporary bonding step of temporarily bonding the fixed members 12 and 18 and the bearings 14 and 16 with an anaerobic adhesive in an atmosphere under an atmospheric pressure environment, and a vacuum environment. It has a leaving step for completely curing the anaerobic adhesive in the lower atmosphere, and a baking step for degassing in the atmosphere under the baking environment.

  Further, in the manufacturing method of the present embodiment, at least a portion of the fixed member (the shaft 12 and the housing 18) that is fixed to the bearings 14 and 16 is recessed from the other portions. A formed groove is provided. As described above, since the bearing unit J is configured by interposing (mounting) the plurality of bearings 14 and 16 between the fixed members 12 and 18, the concave groove is the shaft 12 which is the fixed member. Are formed on the outer peripheral surface of the housing 18 and the inner peripheral surface of the housing 18 which is a fixed member. In the following manufacturing method, as an example, a case is assumed in which the shaft 12 having a concave groove formed on the outer peripheral surface and the one-end side ball bearing 14 are fixed.

  As shown in FIGS. 1A to 1E, in the temporary bonding step, an anaerobic process is performed on the fixing portion 12w of the shaft 12 while rotating the member to be fixed (that is, the shaft 12) in an atmosphere under an atmospheric pressure environment. After applying the adhesive 22, the ball bearing 14 is mounted on the shaft 12, and the shaft 12 and the ball bearing 14 (inner ring Rin) are temporarily bonded by the anaerobic adhesive 22. The atmospheric pressure is a pressure due to the weight of air (pressure that works to crush an object from all directions), and the atmospheric pressure near the ground surface is 1 atm = 1013 hPa = 760 mmHg. Further, as the anaerobic adhesive 22, for example, an ultraviolet curable anaerobic adhesive having a high glass transition point mainly containing methacrylic acid diester and containing hydroxyalkyl methacrylate, acrylic acid dimer, organic hydroxide, and a photosynthesis initiator. What is necessary is just to apply an agent.

  The temporary bonding process will be described in detail. The outer peripheral surface 12a of the shaft 12 includes a fixing portion 12w for fixing the ball bearing 14 and a fixing portion 12w for fixing the ball bearing 16 (FIG. 2 (c)). A plurality of concave grooves 12g (FIG. 1 (c)) formed in parallel and straight from one end side (side where the flange 12f is formed) to the other end side are provided. ing. In this case, for the number of the concave grooves 12g, the interval between the concave grooves, and the groove shape (shape including groove width, groove depth, etc.), for example, the type of anaerobic adhesive 22 applied to the fixed portion 12w In this case, it is not particularly limited. In the drawing, as an example of the groove shape of the concave groove 12g, a groove shape such as a rectangular shape (FIG. 1 (d)) or a triangular shape (FIG. 1 (e)) is shown.

  In the temporary bonding step, the shaft 12 is supported at one end by a rotary holder 24 (FIG. 1 (a)). By rotating the holder 24 in this state, the shaft 12 is moved to an arrow, for example. It can be rotated in the K direction. In this case, the rotation direction and rotation speed of the shaft 12 are not particularly limited here because they are arbitrarily set according to, for example, the type and application amount of the anaerobic adhesive 22 applied to the fixed portion 12w.

  In the temporary bonding step, the anaerobic adhesive 22 is applied to the fixed portion 12w while rotating the shaft 12 by the rotary holder 24 (FIG. 1A). In this case, the anaerobic adhesive 22 is supplied from an adhesive supply source (not shown) and then discharged from the discharge port 26a of the nozzle 26 toward the fixed portion 12w. At this time, the discharge speed and the discharge amount when discharging the anaerobic adhesive 22 from the discharge port 26a are arbitrarily set according to, for example, the type and the application amount of the anaerobic adhesive 22, and thus are particularly limited here. do not do. Thereby, the anaerobic adhesive 22 is uniformly and uniformly applied to the fixing portion 12w of the shaft 12 over the entire circumference.

  Subsequently, in the temporary bonding step, the ball bearing 14 is mounted on the shaft 12 on which the anaerobic adhesive 22 is applied to the fixed portion 12w (FIG. 1B). At this time, when the inner ring Rin of the ball bearing 14 is fitted to the shaft 12 (outer peripheral surface 12a) and brought into contact with the flange 12f, the anaerobic adhesive 22 applied to the fixed portion 12w is removed from the shaft 12 and the ball bearing 14 ( The shaft 12 and the ball bearing 14 (inner ring Rin) are temporarily bonded together by being interposed between the inner ring Rin) and the inner ring Rin).

  In the temporary bonding step, when the shaft 12 and the ball bearing 14 are temporarily bonded, the ball bearing 14 is held for a predetermined preload time in a state where an optimal preload is applied by a preload setting jig (not shown). . Here, the preload time is arbitrarily set according to, for example, the type and size of the bearing, or the purpose and environment of use of the bearing. As an example, the ball bearing 14 is set by a preload setting jig. The case where it hold | maintains for about 30 minutes is assumed.

  When the ball bearing 14 is held for about 30 minutes by the preload setting jig, the entire anaerobic adhesive 22 for temporarily bonding the shaft 12 and the ball bearing 14 is not completely cured and is partially formed. When the uncured portion remains, after the preload setting jig is removed, a leaving step is performed next. The timing for removing the preload setting jig is determined when the anaerobic adhesive 22 is cured to such an extent that the position of the shaft 12 and the ball bearing 14 does not shift or move in the release of the preload and the subsequent handling. It is preferable to remove the jig.

  In the leaving step after removing the preload setting jig, the vacuum environment in which the shaft 12 and the ball bearing 14 and the uncured anaerobic adhesive 22 are set to a temperature higher than the temperature in the atmosphere under the atmospheric pressure environment. The whole of the anaerobic adhesive 22 is completely cured by leaving it in a lower atmosphere for a predetermined time. In this case, the temperature in the atmosphere under the vacuum environment is arbitrarily set based on the temperature in the atmosphere under the atmospheric pressure environment, so there is no particular limitation, but here the temperature in the atmosphere under the vacuum environment as an example Is assumed to be set to 60 ° C. or lower. At this time, the degree of vacuum in the atmosphere under the vacuum environment is arbitrarily set according to, for example, the type of the anaerobic adhesive 22, but here, a case where it is set to 5 Torr or less is assumed as an example.

  Further, as a method of leaving the shaft 12 and the ball bearing 14 and the uncured anaerobic adhesive 22 in a vacuum environment for a predetermined time, for example, the shaft 12 and the ball bonded to each other with the anaerobic adhesive 22 are used. The bearing 14 is accommodated in a vacuum chamber (not shown) as it is, the inside of the vacuum chamber is pulled to a negative pressure of 5 Torr or less, and the temperature in the atmosphere in the vacuum environment is set to 60 ° C. or less. Then, it is left in that state for a predetermined time. In this case, the standing time is set to a time required until the entire anaerobic adhesive 22 is completely cured. This is arbitrarily set according to, for example, the type and application amount of the anaerobic adhesive 22, but here, as an example, it is assumed that the anaerobic adhesive 22 is left for about 2 hours. As a result, the entire anaerobic adhesive 22 is completely cured, including the portion that protrudes from the fixed portion 12w into the vacuum environment.

  After the entire anaerobic adhesive 22 is completely cured in the leaving step, the shaft 12 and the ball bearing 14 and the completely cured anaerobic adhesive 22 are degassed in an atmosphere in a baking environment. Is given.

  In the baking step, impurities are removed by leaving the substrate in a baking environment in which the temperature in the atmosphere in a vacuum environment is increased for a predetermined time. In this case, the temperature in the atmosphere in the baking environment is arbitrarily set based on the temperature in the atmosphere in the vacuum environment, and is not particularly limited, but here, as an example, the temperature in the atmosphere in the baking environment is set. The case where it sets to 80 degreeC or more is assumed. In addition, the standing time in the baking environment is set to a time required for complete degassing. This is arbitrarily set according to, for example, the type and application amount of the anaerobic adhesive 22, but here, as an example, it is assumed that the anaerobic adhesive 22 is left for about 2 hours. Further, as the degassed impurities, for example, air bubbles entrained when the anaerobic adhesive 22 is applied or when the bearing is mounted, or air interposed between the concave groove 12g and the anaerobic adhesive 22 in the fixed portion 12w. Further, a gas that volatilizes from the anaerobic adhesive 22 can be assumed.

  After fixing the shaft 12 and the one end side ball bearing 14 (inner ring Rin) by each of these steps, the shaft 12 and the other end side ball bearing 16 (inner ring Rin) are fixed by the same steps as described above. The housing 18 is fixed to the outer ring Rout of the two ball bearings 14 and 16. In the method of fixing the ball bearings 14 and 16 to the housing 18, a concave groove having the same shape as that shown in FIG. 1C, for example, is provided on the inner peripheral surface of the housing 18, and the same processes as those described above are performed. The ball bearings 14 and 16 (outer ring Rout) and the housing 18 may be fixed. Thus, the bearing unit J (FIG. 2 (c)) in which the fixed member (the shaft 12 and the housing 18) and the rolling bearing (the one end side ball bearing 14 and the other end side ball bearing 16) are fixed with the anaerobic adhesive. Can be manufactured.

  As described above, according to the present embodiment, after the entire anaerobic adhesive 22 is completely cured in the leaving step, degassing is performed in a baking environment at a temperature of 80 ° C. or higher in the baking step. Compared with the case where degassing is performed with the uncured portion of the anaerobic adhesive 22 remaining, the material of the member to be fixed (the shaft 12 and the housing 18) and the rolling bearing (one end side ball bearing 14, the other end side ball bearing) Even if there is a difference in linear expansion coefficient from the material of 16), the deformation of the bearings 14 and 16 after the entire anaerobic adhesive 22 is completely cured can be suppressed, so that a more accurate bearing Unit J (FIG. 2 (c)) can be manufactured.

  Further, according to the present embodiment, the anaerobic adhesive 22 is applied to the fixed portion 12w in the atmosphere under the atmospheric pressure environment, the ball bearing 14 is temporarily bonded to the shaft 12, and the preload setting jig In the atmosphere in a vacuum environment, the shaft 12 and the ball bearing 14 and the uncured anaerobic adhesive 22 are left in the vacuum chamber as they are. Thus, the shaft 12 and the ball bearing 14 can be efficiently fixed. As a result, the manufacturing cost of the bearing unit J can be greatly reduced.

  Furthermore, according to the present embodiment, the concave groove 12g is provided in the fixing portion 12w for fixing the bearings 14 and 16 of the member to be fixed (the shaft 12 and the housing 18). Gas venting can be smoothly promoted through 12 g. Thereby, it becomes possible to perform a baking process reliably.

The present invention is not limited to the above-described embodiments, and the following modifications are also included in the technical scope of the present invention.
In the embodiment described above, the concave groove 12g is configured to be continuous straight from one end side to the other end side, but this is formed along the outer peripheral surface 12a of the shaft 12 from one end side to the other end side. It is good also as a structure continuous in a spiral.

  In the embodiment described above, the concave groove 12g is configured to be continuous over the whole including the respective fixing portions 12w for fixing the two ball bearings 14 and 16 (FIG. 2C). You may comprise a ditch | groove only in the fixing | fixed part 12w of the bearings 14 and 16. FIG.

  As a first modification, as shown in FIG. 1 (f), concave grooves 12g are independently formed only in the fixing portion 12w of the shaft 12 for fixing the ball bearings 14 and 16, and the circumferential direction is formed on both sides thereof. The continuous annular groove (main groove Mg, sub-groove Sg) is formed. In this case, the sub-groove Sg is preferably positioned so as to face the inner end H of the inner ring Rin of the two ball bearings 14 and 16. Moreover, it is preferable that the main groove Mg is positioned in the approximate center of each fixing part 12w.

  According to the configuration of such annular grooves (main groove Mg, sub-groove Sg) and concave groove 12g, in the baking process described above, impurities such as bubbles and gases are transferred from the main groove Mg to the concave grooves 12g and sub-groove Sg. Can be gently vented through. If the uncured adhesive bubbles pop out so as to flip, this may contaminate the periphery of the bearing, but according to the configuration of the annular groove (main groove Mg, sub groove Sg) and the concave groove 12g described above, This can be prevented beforehand.

  As a second modification of the present invention, as shown in FIG. 1 (g), the groove 12g may be inclined while the configuration of the annular groove (main groove Mg, sub-groove Sg) is not changed. In this case, since the inclination angle is arbitrarily set according to, for example, the rotation speed of the shaft 12 and the type of the anaerobic adhesive 22, it is not particularly limited here.

  As a third modification of the present invention, as shown in FIG. 1 (h), the groove shape of the annular groove (sub-groove Sg) facing the inner end H of the inner ring Rin of the two ball bearings 14, 16 is approximately. V-shaped. In this case, the groove depth Gd, the groove width Gw, and the groove bottom position Gp of the sub-groove Sg are preferably set so that the groove width Gw> 0, and the groove bottom position Gp is preferably set to 0 (zero). The groove depth Gd is not particularly limited here, for example, because it is arbitrarily set according to, for example, the application amount or type of the anaerobic adhesive 22. According to this, degassing can be promoted in the direction indicated by the arrow Ar in the drawing in the baking process described above. Thereby, it becomes possible to perform a baking process reliably.

  In the above-described embodiment and the first to third modifications, instead of forming the concave groove 12g and the annular groove (main groove Mg, sub-groove Sg) as described above, ball bearings 14 and 16 Asperities may be formed on the surface of the fixing part 12w by, for example, knurling the fixing part 12w of the shaft 12 for fixing the screw.

(a) is the figure which shows the state which has applied the anaerobic adhesive to the outer peripheral surface of a shaft in the manufacturing technology of the bearing unit which concerns on one embodiment of this invention, (b) is an anaerobic adhesive. The figure which shows the state which has fixed the bearing to the outer peripheral surface of the apply | coated shaft, (c) is a figure which shows the structure of the outer peripheral surface of the shaft in which the groove | channel for hardening promotion of the anaerobic adhesive was formed, (d) Is a cross-sectional view showing a partially enlarged configuration of a rectangular hardening promoting groove, (e) is a cross-sectional view showing a partially enlarged configuration of a triangular hardening promoting groove, (f), In the manufacturing technology of the bearing unit according to the first modification of the present invention, a diagram showing the configuration of the groove for promoting the hardening of the anaerobic adhesive, (g) of the bearing unit according to the second modification of the present invention. In the manufacturing technology, a diagram showing another configuration of the groove for promoting the curing of the anaerobic adhesive, (h) is a bearing unit according to a third modification of the present invention The other technique WHEREIN: The figure which shows the other structure of the groove | channel for hardening acceleration | stimulation of anaerobic adhesive. (a) is sectional drawing of HDD apparatus, (b) is a top view of HDD apparatus, (c) is sectional drawing which shows the structure of the bearing unit used for HDD apparatus.

Explanation of symbols

12 Shaft (fixed member)
12g Concave groove 12w Fixed part 14 Bearing 18 Housing (fixed member)

Claims (10)

A method of manufacturing a bearing unit by fixing a fixed member and a bearing with an anaerobic adhesive,
The member to be fixed is provided with a concave groove formed by recessing at least a part of the fixing part for fixing the bearing from other parts,
An anaerobic adhesive is applied to the fixed part of the fixed member and the bearing while rotating the fixed member in an atmosphere under an atmospheric pressure environment, and then the bearing is attached to the fixed member and the anaerobic adhesive is attached. A temporary bonding step of temporarily bonding the fixed member and the bearing,
The anaerobic adhesive that temporarily bonds the fixed member and the bearing is not completely cured, and an uncured part remains in a part thereof, and the fixed member, the bearing, and the uncured state The anaerobic adhesive is allowed to stand for a predetermined time in an atmosphere of a vacuum environment set to a temperature higher than the temperature in the atmosphere under an atmospheric pressure environment to completely cure the entire anaerobic adhesive. It possesses a step,
When temporarily bonding the fixed member and the bearing with an anaerobic adhesive in the temporary bonding step, the bearing is maintained in a state where a predetermined preload is applied by a predetermined preload setting jig,
A method for manufacturing a bearing unit, comprising: removing a preload setting jig, and leaving a fixed member, a bearing, and an uncured anaerobic adhesive in an atmosphere in a vacuum environment for a predetermined time in a leaving step . The timing for removing the preload setting jig is set so that the preload setting jig is removed when the anaerobic adhesive is cured to such an extent that the position of the fixed member and the bearing does not shift or move. The manufacturing method of the bearing unit of Claim 1. 3. The groove according to claim 1, wherein the groove is independently formed only in the fixing portion of the member to be fixed for fixing the bearing, and the annular groove that is continuous along the circumferential direction is formed on both sides thereof. Manufacturing method of bearing unit. 4. The method for manufacturing a bearing unit according to claim 3, wherein the sub-groove positioned so as to face the side end of the bearing among the annular grooves has a substantially V-shaped groove shape. . 5. The method for manufacturing a bearing unit according to claim 1 , wherein the temperature in the atmosphere in a vacuum environment is set to 60 ° C. or lower in the leaving step. 6. The method for manufacturing a bearing unit according to claim 1, wherein in the leaving step, the degree of vacuum in the atmosphere in a vacuum environment is set to 5 Torr or less. After the entire anaerobic adhesive is completely cured in the leaving process, the fixed member and the bearing and the completely cured anaerobic adhesive are conditioned in a baking environment in which the temperature in the vacuum environment is increased. The method for manufacturing a bearing unit according to any one of claims 1 to 6 , wherein impurities are removed by being left standing for a predetermined time. A bearing unit manufactured by the manufacturing method according to claim 1 ,
The bearing unit includes a shaft as a fixed member that is set up and installed on the base of the hard disk drive device, a bearing that is mounted on the shaft, and a housing that is mounted on the bearing. The bearing unit is fixed between the shaft and the housing by an anaerobic adhesive. 9. The bearing unit according to claim 8, wherein the groove is independently formed only in the fixing portion of the member to be fixed for fixing the bearing, and the annular groove continuous along the circumferential direction is formed on both sides thereof. . 10. The bearing unit according to claim 9, wherein the sub-groove positioned so as to face the side end of the bearing among the annular grooves has a substantially V-shaped groove shape.

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