JP5288545B2 - Manufacturing method of bearing device - Google Patents

Description

The present invention relates to the production how the bearing device.

  2. Description of the Related Art Conventionally, an information recording / reproducing apparatus such as a hard disk for storing and reproducing various kinds of information on a disk magnetically or optically is known. Generally, an information recording / reproducing apparatus includes an actuator having a swing arm provided with a magnetic head for recording / reproducing a signal on / from a disk. This actuator is rotatably supported by a bearing device provided on the base end side. In other words, the swing arm can be rotated along a horizontal plane by rotating this bearing device, and the signal is recorded and reproduced by moving the magnetic head at the tip of the swing arm to a predetermined position on the disk. be able to.

As this bearing device, a device in which a rolling bearing is interposed between a shaft and a sleeve is generally used. As a method of fixing the rolling bearing, a method of press-fitting and fixing the rolling bearing to the shaft and the sleeve, a method of press-fitting and fixing using an adhesive, or a method of fixing only with an adhesive is used (for example, Patent Documents). 1). Here, when the rolling bearing is press-fitted and fixed, the rolling bearing, the shaft, and the sleeve are required to have strict processing accuracy, so that there is a problem that the yield decreases. Therefore, a method of bonding and fixing between the rolling bearing and the shaft and sleeve is desirable.
JP-A-8-184322

  By the way, the adhesive fixing portion structure of the bearing of Patent Document 1 is such that when the adhesive is applied so as to rise somewhat from the concave portion where the adhesive is applied, the adhesive is dragged to the rolling bearing when the rolling bearing is inserted into the shaft and sleeve. And may adhere to surfaces other than the recesses of the shaft and sleeve. When the adhesive is heat-cured in such a state, the adhesive expands, so that the rolling bearing is distorted, and the roundness of the rolling bearing is deteriorated. In particular, if the adhesive is hardened with the adhesive on the rolling surfaces of the inner and outer rings of the rolling bearing, the rolling surface is distorted, which hinders the movement of the rolling elements and increases torque fluctuation. There was a problem.

  In addition, when the torque fluctuation of the bearing device incorporated in the swing arm used for the hard disk becomes large, there is a risk that the swing arm may not operate smoothly or may not be able to read and write.

The present invention has been made in view of the above circumstances, in which rolling strain of contact surface can be suppressed, to provide a manufacturing how the bearing device can be prevented from torque fluctuation becomes larger is there.

In order to solve the above problems, the present invention provides the following means.
The method of manufacturing a bearing device according to the present invention includes a shaft formed in a cylindrical shape and having a flange portion whose diameter is enlarged at one end portion in the axial direction, and a coaxial shape spaced apart from the outer peripheral surface of the shaft by a predetermined distance. A cylindrical sleeve disposed between the shaft and the sleeve, and an inner ring is bonded and fixed to the shaft, an outer ring is bonded and fixed to the sleeve, and the inner ring contacts the flange portion. A first rolling bearing in contact with the first rolling bearing and a position spaced apart from the first rolling bearing by a predetermined distance in the axial direction of the shaft, the inner ring being bonded and fixed to the shaft, and the outer ring being bonded and fixed to the sleeve A first rolling groove on the outer peripheral surface of the shaft, and a first rolling groove formed on the outer peripheral surface of the shaft. A second bonding groove formed at a contact portion with the bearing, a third bonding groove formed at a contact portion with the first rolling bearing on the inner peripheral surface of the sleeve, and an inner portion of the sleeve. Between the first rolling bearing and the second rolling bearing in the sleeve, between the first rolling bearing and the second rolling bearing formed in a contact portion with the second rolling bearing on the peripheral surface, and the first rolling bearing and the spacer portions for holding the distance between the second rolling bearing to the predetermined distance, while being abutted in the circumferential direction of the sleeve, in the manufacturing method of the protrusion arranged bearing device towards the radially inner side of the sleeve, the A first bonding groove is provided in the axial direction of the rolling surface formed on the inner ring and the outer ring in order to dispose a rolling element interposed between the inner ring and the outer ring of the first rolling bearing. Before the center Rollers formed on the inner ring and the outer ring in order to dispose the rolling elements formed on the flange side and the second bonding groove portion interposed between the inner ring and the outer ring of the second rolling bearing. It is formed on the flange side with respect to the second central portion in the axial direction of the running surface, the third bonding groove is formed on the spacer side with respect to the first central portion, and the fourth bonding groove is It is formed on the spacer side than the second central portion, and the step of applying an adhesive to the groove for the first adhesive, and inserting the shaft into the first rolling bearing, the flange portion and the first A step of bringing the inner ring of the rolling bearing into contact, a step of applying an adhesive to the fourth bonding groove, the second rolling bearing being inserted into the sleeve, and the spacer portion and the second rolling bearing. Contacting the outer ring, and A step of applying an adhesive to the second bonding groove and the third bonding groove, and inserting the shaft having the first rolling bearing through the sleeve to which the second rolling bearing is mounted, and the spacer. it is characterized in having a step of contact with the outer ring parts between the first rolling bearing, a.

The bearing device manufacturing method according to the present invention includes a shaft having a flange portion that is formed in a columnar shape and has an enlarged diameter at one end in the axial direction, and is spaced a predetermined distance from the outer peripheral surface of the shaft. A cylindrical sleeve arranged coaxially, and disposed between the shaft and the sleeve, an inner ring is bonded and fixed to the shaft, an outer ring is bonded and fixed to the sleeve, and the inner ring is fixed to the flange portion A first rolling bearing in contact with the first rolling bearing and a position spaced apart from the first rolling bearing by a predetermined distance in the axial direction of the shaft, the inner ring is bonded and fixed to the shaft, and the outer ring is fixed to the sleeve A first rolling groove formed on the outer peripheral surface of the shaft in contact with the first rolling bearing, and the outer peripheral surface of the shaft. A second bonding groove formed at a contact point with the second rolling bearing, a third bonding groove formed at a contact point with the first rolling bearing on the inner peripheral surface of the sleeve, and the sleeve A fourth bonding groove formed in a contact portion with the second rolling bearing on the inner peripheral surface, and the first rolling bearing between the first rolling bearing and the second rolling bearing in the sleeve. In the manufacturing method of the bearing device in which the spacer portion that holds the interval with the second rolling bearing at a predetermined distance is in contact with the circumferential direction of the sleeve and is arranged to protrude radially inward of the sleeve . In the axial direction of the rolling surface formed on the inner ring and the outer ring, the first bonding groove portion is provided with a rolling element interposed between the inner ring and the outer ring of the first rolling bearing. First center Is also formed on the flange side, and the second bonding groove is formed on the inner ring and the outer ring to dispose a rolling element interposed between the inner ring and the outer ring of the second rolling bearing. The third bonding groove is formed on the spacer side of the first central portion, and the fourth bonding groove is formed on the flange side of the second central portion in the axial direction of the rolling surface. the second and than the central portion is formed on the spacer side, a step of applying an adhesive to the third groove for adhesive, and inserting the first rolling bearing in the sleeve, the said spacer portion A step of contacting an outer ring of the first rolling bearing; a step of applying an adhesive to the first bonding groove; and inserting the shaft into the sleeve to which the first rolling bearing is attached; Section and the first rolling shaft A step of abutting the inner ring of the receiving portion, a step of applying an adhesive to the second bonding groove portion and the fourth bonding groove portion, and inserting the second rolling bearing through the shaft, and the spacer portion and the It is characterized by having a step of abutting the outer ring of the second rolling bearing, the.

  With this configuration, when the first rolling bearing and the second rolling bearing are attached to the shaft and the sleeve, the length of the adhesive groove portion to which the adhesive is applied overlaps with the inner peripheral surface or the outer peripheral surface of the rolling bearing. Can be minimized. That is, it is possible to suppress the adhesive from being dragged into the gap between the rolling bearing other than the bonding groove and the shaft and the sleeve and adhering to the center of the rolling surface. Therefore, even if the adhesive is heat-cured in such a state, it becomes possible to suppress the distortion of the rolling surface without deteriorating the roundness of the rolling bearing, and to suppress an increase in torque fluctuation. can do.

  According to the manufacturing method of the bearing device according to the present invention, when the first rolling bearing and the second rolling bearing are attached to the shaft and the sleeve, the adhesive groove portions to which the adhesive is applied and the inner peripheral surface or the outer peripheral surface of the rolling bearing. The length that the surface overlaps can be minimized. That is, it is possible to suppress the adhesive from being dragged into the gap between the rolling bearing other than the bonding groove and the shaft and sleeve. Therefore, even if the adhesive is heat-cured in such a state, it is possible to suppress an increase in torque fluctuation without deteriorating the roundness of the rolling bearing. As a result, the yield can be improved.

  Next, an embodiment of a bearing device according to the present invention will be described with reference to FIGS. In the present embodiment, the case where the bearing device is used for the pivot shaft of the information recording / reproducing apparatus will be described.

  FIG. 1 is a schematic configuration diagram of an information recording / reproducing apparatus 1 according to the present invention. Note that the information recording / reproducing apparatus 1 of the present embodiment is an apparatus for writing on a disk (magnetic recording medium) D having a perpendicular recording layer by a perpendicular recording method.

  As shown in FIG. 1, the information recording / reproducing apparatus 1 includes a carriage 11, a laser light source 20 that supplies a light beam from the proximal end side of the carriage 11 through an optical waveguide 32, and a head supported on the distal end side of the carriage 11. A gimbal assembly (HGA) 12, an actuator 6 that scans and moves the head gimbal assembly 12 in a horizontal plane parallel to the disk surface D1 (the surface of the disk D), and a spindle motor 7 that rotates the disk D about the rotation axis L2. And a control unit 5 for supplying a current modulated according to information to the slider 2 of the head gimbal assembly 12, and a housing 9 for housing these components therein.

  The housing 9 has a box-like shape having a top opening made of a metal material such as aluminum, and has a rectangular bottom portion 9a as viewed from above, and a peripheral wall erected in the vertical direction with respect to the bottom portion 9a at the periphery of the bottom portion 9a. (Not shown). And the recessed part which accommodates each component mentioned above is formed in the inner side enclosed by the surrounding wall. In FIG. 1, the peripheral wall surrounding the housing 9 is omitted for easy understanding.

  Further, a lid (not shown) is detachably fixed to the housing 9 so as to close the opening of the housing 9. The spindle motor 7 is attached to substantially the center of the bottom portion 9a, and the disc D is detachably fixed by fitting a center hole into the spindle motor 7.

  The actuator 6 described above is attached to one corner of the bottom 9a outside the disk D. The actuator 6 is provided with a carriage 11 that can rotate around a rotation axis L1 in a horizontal plane around a pivot shaft (bearing device) 10. The carriage 11 includes an arm portion 14 extending from the base end portion toward the tip portion (in the direction of the disk D), and a base portion 15 that supports the arm portion 14 in a cantilever manner via the base end portion. However, they are integrally formed by machining or the like. The base portion 15 is formed in a substantially rectangular parallelepiped shape, and is supported so as to be rotatable around the pivot shaft 10. That is, the base portion 15 is connected to the actuator 6 via the pivot shaft 10, and the pivot shaft 10 is the rotation center of the carriage 11.

  The arm portion 14 extends in parallel with the surface direction (horizontal plane direction) of the upper surface of the base portion 15 on the side surface 15b opposite to the side surface 15a to which the actuator 6 is attached in the base portion 15 (side surface on the opposite side of the corner portion). It is a flat plate to be extended, and three pieces extend along the height direction (vertical direction) of the base 15. Specifically, the arm portion 14 is formed in a tapered shape that tapers from the proximal end portion toward the distal end portion, and is arranged so that the disk D is sandwiched between the arm portions 14 and 14. That is, the arm part 14 and the disk D are configured to be alternately arranged, and the arm part 14 can be moved in a direction parallel to the surface of the disk D (horizontal plane direction) by driving the actuator 6. . The carriage 11 and the head gimbal assembly 12 are retracted from the disk D by driving the actuator 6 when the rotation of the disk D is stopped.

  The head gimbal assembly 12 is connected to the tip of the arm portion 14 and includes a suspension 3 and a slider 2 attached to the tip of the suspension 3. Further, the head gimbal assembly 12 guides a light beam from the laser light source 20 to the slider 2 having a near-field light generating element (not shown) to generate near-field light (spot light), and uses the near-field light to disc Various information is recorded and reproduced in D. Note that the near-field light generating element includes, for example, an optical minute aperture, a protrusion formed in a nanometer size, and the like.

  As shown in FIG. 2, the pivot shaft 10 includes a shaft 41 that is formed in a substantially columnar shape, a substantially cylindrical sleeve 43 that is spaced from the outer peripheral surface 41 a of the shaft 41 by a predetermined distance, The first rolling bearing 51 interposed between the shaft 43 and the sleeve 43, and the second rolling bearing interposed between the shaft 41 and the sleeve 43 in parallel with the first rolling bearing 51 at a predetermined interval. 52.

  The shaft 41 is a substantially cylindrical rod-like member, and a first rolling bearing 51 is attached to one end side in the longitudinal direction (axial direction), and the second rolling bearing is spaced apart from the first rolling bearing 51 in the axial direction. 52 is attached. Further, a flange portion 44 that is larger in diameter than the shaft 41 and is brought into contact with the first rolling bearing 51 is formed on the end surface on one end side of the shaft 41. Further, the first bonding groove portion 71 and the second bonding groove portion 72 that apply the adhesive B to the positions where the first rolling bearing 51 and the second rolling bearing 52 abut on the outer circumferential surface 41 a of the shaft 41 are the outer circumferential surface of the shaft 41. It is formed over the entire circumference of 41a.

  The sleeve 43 is a member formed in a substantially cylindrical shape, and the first rolling bearing 51 is mounted on one end side in the longitudinal direction (axial direction) and the second rolling bearing 52 is mounted on the other end side. In addition, while the first rolling bearing 51 and the second rolling bearing 52 in the sleeve 43 are arranged, the spacer portion 45 that holds the distance between the first rolling bearing 51 and the second rolling bearing 52 at a predetermined distance is used. It protrudes inward in the direction. Further, a third bonding groove 73 and a fourth bonding groove 74 for applying an adhesive to a position in contact with the first rolling bearing 51 and the second rolling bearing 52 on the inner peripheral surface 43 a of the sleeve 43 are the inner periphery of the sleeve 43. Each is formed over the entire circumference of the surface 43a. In addition, you may comprise the sleeve 43 and the spacer part 45 by another member.

  The first rolling bearing 51 and the second rolling bearing 52 are bearings formed in the same shape. Specifically, the first rolling bearing 51 is interposed between the inner ring 51a, the outer ring 51b coaxially arranged with respect to the inner ring 51a, and between the inner ring 51a and the outer ring 51b, and rolls at a predetermined position. Rolling elements 51c. Similarly, the second rolling bearing 52 is interposed between the inner ring 52a, the outer ring 52b disposed coaxially with the inner ring 52a, and between the inner ring 52a and the outer ring 52b, and a plurality of rolling elements that roll at predetermined positions. And a moving body 52c. In addition, the rolling elements 51c and 52c are hold | maintained by the holder | retainer which is not illustrated between each inner ring | wheel and an outer ring | wheel.

  Further, the inner ring 51a and the outer ring 51b of the first rolling bearing 51 are formed so as to face a concave rolling surface 51d that holds the rolling element 51c in a rollable manner. Similarly, the inner ring 52a and the outer ring 52b of the second rolling bearing 52 are formed so as to face a concave rolling surface 52d that holds the rolling element 52c in a rollable manner.

  Here, the first bonding groove 71 to the fourth bonding groove 74 are formed at positions that do not overlap the rolling surfaces 51d and 52d in the axis L1 direction. The first bonding groove 71 is formed on the flange 44 side of the rolling element 51c (the first central part 51e that is the center of the rolling surface 51d in the axis L1 direction), and the second bonding groove 72 is the rolling element. It is formed on the first rolling bearing 51 side with respect to 52c (the second central portion 52e which is the center in the axis L1 direction of the rolling surface 52d). On the other hand, the third bonding groove 73 is formed closer to the second rolling bearing 52 than the rolling element 51c, and the fourth bonding groove 74 is formed closer to the first rolling bearing 51 than the rolling element 52c. The first bonding groove 71 to the fourth bonding groove 74 have a substantially rectangular cross-sectional shape along the axis L1.

Next, a method for manufacturing the pivot shaft 10 will be described with reference to FIGS.
First, as shown in FIG. 3, the adhesive B is applied to the first bonding groove 71 formed on the outer peripheral surface 41 a of the shaft 41. For example, a thermosetting adhesive is used as the adhesive. Then, the shaft 41 is inserted into the first rolling bearing 51 and pushed in until the inner ring 51 a of the first rolling bearing 51 contacts the flange portion 44.

  Next, as shown in FIG. 4, the adhesive B is applied to the fourth bonding groove 74 formed on the inner peripheral surface 43 a of the sleeve 43. The second rolling bearing 52 is inserted into the sleeve 43 and pushed in until the outer ring 52 b of the second rolling bearing 52 contacts the spacer portion 45.

Next, as shown in FIG. 5, the adhesive B is applied to the second bonding groove 72 formed on the outer peripheral surface 41 a of the shaft 41, and the third bonding is formed on the inner peripheral surface 43 a of the sleeve 43. Adhesive B is applied to the groove 73.
Then, the shaft 41 to which the first rolling bearing 51 is attached is inserted into the sleeve 43 to which the second rolling bearing 52 is attached, and is pushed in until the outer ring 51 b of the first rolling bearing 51 comes into contact with the spacer portion 45. .

  Then, as shown in FIG. 6, the first rolling bearing 51 and the second rolling bearing 52 are fixed to the shaft 41 and the sleeve 43 while pressing the inner ring 52 a of the second rolling bearing 52 to the first rolling bearing 51 side with a predetermined pressure. To do. A pressing jig 75 is used when pressing the inner ring 52a of the second rolling bearing 52 with a predetermined pressure. The pressing jig 75 has a tip formed on a flat surface, and the pressing jig 75 can be brought into contact with the end surface of the inner ring 52 a of the second rolling bearing 52.

  After the first rolling bearing 51 and the second rolling bearing 52 are fixed to the shaft 41 and the sleeve 43 using the pressing jig 75, the adhesive B is thermally cured by being put in a thermostatic bath, thereby completing the manufacture of the pivot shaft 10. .

  Here, in this embodiment, the first bonding groove 71 to the fourth bonding groove 74 are formed at positions that do not overlap the rolling surfaces 51d and 52d in the direction of the axis L1. That is, since the inner rings 51a and 52a and the outer rings 51b and 52b at positions facing the first bonding groove 71 to the fourth bonding groove 74 are thick, the adhesive B expands when the adhesive B is thermoset. Even so, the rolling surfaces 51d and 52d are not affected. As a result, distortion of the rolling surfaces 51d and 52d can be suppressed, and torque fluctuation can be suppressed from increasing.

  Further, according to the present embodiment, the first bonding groove 71 is formed on the flange 44 side with respect to the rolling element 51c, and the second bonding groove 72 is formed on the first rolling bearing 51 side with respect to the rolling element 52c. . On the other hand, the third bonding groove 73 is formed closer to the second rolling bearing 52 than the rolling element 51c, and the fourth bonding groove 74 is formed closer to the first rolling bearing 51 than the rolling element 52c.

  By forming the first bonding groove 71 to the fourth bonding groove 74 in this way, the adhesive B is applied when the first rolling bearing 51 and the second rolling bearing 52 are attached to the shaft 41 and the sleeve 43. Further, the first bonding groove 71 to the fourth bonding groove 74 overlap with the inner circumferential surfaces of the inner rings 51a and 52a of the first rolling bearing 51 and the second rolling bearing 52 or the outer circumferential surfaces of the outer rings 51b and 52b. Length) can be minimized. That is, the adhesive B is dragged by the gap between the rolling bearings 51 and 52 other than the first bonding groove 71 to the fourth bonding groove 74 and the shaft 41 and the sleeve 43, and the center portions 51e of the rolling surfaces 51d and 52d. It can suppress adhering to 52e. Therefore, even if the adhesive B is thermoset in such a state, the roundness of the rolling bearings 51 and 52 is not deteriorated, and the distortion of the rolling surfaces 51d and 52d can be suppressed, and the torque can be reduced. An increase in fluctuation can be suppressed.

  The information recording / reproducing apparatus 1 according to the present embodiment includes the pivot shaft 10 that can suppress drag of the adhesive B and suppress increase in torque fluctuation. The position of the gimbal assembly 12 can be controlled with high accuracy.

Next, another method for manufacturing the pivot shaft 10 will be described with reference to FIGS.
First, as shown in FIG. 7, the adhesive B is applied to the third bonding groove 73 formed on the inner peripheral surface 43 a of the sleeve 43. The first rolling bearing 51 is inserted into the sleeve 43 and pushed in until the outer ring 51 b of the first rolling bearing 51 comes into contact with the spacer portion 45.
Next, as shown in FIG. 8, the adhesive B is applied to the first bonding groove 71 formed on the outer peripheral surface 41 a of the shaft 41. Then, the shaft 41 is inserted through the sleeve 43 to which the first rolling bearing 51 is attached, and is pushed in until the inner ring 51 a of the first rolling bearing 51 contacts the flange portion 44.

  Next, as shown in FIG. 9, the adhesive B is applied to the second bonding groove 72 formed on the outer peripheral surface 41 a of the shaft 41 and the fourth bonding groove 74 formed on the inner peripheral surface 43 a of the sleeve 43. To do. The second rolling bearing 52 is inserted between the shaft 41 and the sleeve 43 and pushed in until the outer ring 52 b of the second rolling bearing 52 contacts the spacer portion 45.

  6, the first rolling bearing 51 and the second rolling bearing 52 are fixed to the shaft 41 and the sleeve 43 while pressing the inner ring 52a of the second rolling bearing 52 against the first rolling bearing 51 with a predetermined pressure. To do.

  After the first rolling bearing 51 and the second rolling bearing 52 are fixed to the shaft 41 and the sleeve 43 using the pressing jig 75, the adhesive B is thermally cured by being put in a thermostatic bath, thereby completing the manufacture of the pivot shaft 10. . Even if the pivot shaft 10 is manufactured by such a manufacturing procedure, the drag of the adhesive B can be suppressed as described above.

Note that the present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.
For example, in the present embodiment, the case where the bearing device is adopted as the pivot shaft of the information recording / reproducing device having the near-field optical head has been described. It can be employed in the rotating shaft portion of various devices.

  Further, in this embodiment, the bonding groove is formed at a position that does not overlap the rolling surface, but at least at the position avoiding the central portion in the axial direction of the rolling surface, the rolling surface is more than conventional. Can be suppressed.

Furthermore, in the present embodiment, the shape of the bonding groove has been described in the case of a rectangular cross section, but as shown in FIG. 10, it is formed in a cross sectional triangle that gradually becomes shallower toward the central portion in the axial direction of the rolling surface. May be.
By comprising in this way, the process of the groove part for adhesion | attachment becomes easy and it can improve production efficiency. Also, by forming a cross-sectional triangle that gradually decreases toward the center in the axial direction of the rolling surface, the amount of adhesive applied to the position facing the thin rolling surface of the inner ring and outer ring is reduced. can do. Therefore, since the expansion amount of the adhesive in the vicinity of the position facing the rolling surface can be reduced, distortion of the rolling surface can be suppressed, and increase in torque fluctuation can be suppressed. Note that the cross-sectional shape of the bonding groove portion does not have to be triangular, and substantially the same effect can be obtained if it is formed so as to gradually become shallower from the end portion toward the central portion.

And as shown in FIG. 11, you may form the groove part for adhesion | attachment by extending to the position corresponding to the edge part of the axial direction of a rolling bearing.
When the end portion of the rolling bearing is tapered by forming the bonding groove in this way, a large space S for the adhesive pool can be secured, and the rolling bearing is firmly bonded to the shaft and the sleeve. It becomes possible.

It is a schematic block diagram of the information recording / reproducing apparatus in embodiment of this invention. It is sectional drawing of the pivot axis | shaft in embodiment of this invention. It is explanatory drawing (1) which shows the manufacturing method of the pivot axis | shaft in embodiment of this invention. It is explanatory drawing (2) which shows the manufacturing method of the pivot axis | shaft in embodiment of this invention. It is explanatory drawing (3) which shows the manufacturing method of the pivot axis | shaft in embodiment of this invention. It is explanatory drawing (4) which shows the manufacturing method of the pivot axis | shaft in embodiment of this invention. It is explanatory drawing (1) which shows another manufacturing method of the pivot axis | shaft in embodiment of this invention. It is explanatory drawing (2) which shows another manufacturing method of the pivot axis | shaft in embodiment of this invention. It is explanatory drawing (3) which shows another manufacturing method of the pivot axis | shaft in embodiment of this invention. It is sectional drawing which shows another aspect of the pivot axis | shaft in embodiment of this invention. It is sectional drawing which shows another aspect of the pivot axis | shaft in embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Information recording / reproducing apparatus 10 ... Pivot shaft (bearing apparatus) 11 ... Carriage 12 ... Head gimbal assembly 14 ... Arm part 20 ... Laser light source (light source) 41 ... Shaft 41a ... Circumferential surface 43 ... Sleeve 43a ... Inner peripheral surface 44 ... Flange 45 ... Spacer 51 ... First rolling bearing 51a ... Inner ring 51b ... Outer ring 51c ... Rolling element 51d ... Rolling surface 51e ... First central part 52 ... Second rolling bearing 52a ... Inner ring 52b ... Outer ring 52c ... Rolling element 52d ... rolling surface 52e ... second central part 71 ... first adhesive groove part 72 ... second adhesive groove part 73 ... third adhesive groove part 74 ... fourth adhesive groove part 75 ... pressing jig (jig) B ... adhesive D ... Disk (magnetic recording medium)

Claims (2)

A shaft having a flange portion formed in a cylindrical shape and having a diameter expanded at one end portion in the axial direction;
A cylindrical sleeve disposed coaxially with a predetermined interval from the outer peripheral surface of the shaft;
A first rolling bearing disposed between the shaft and the sleeve, wherein an inner ring is bonded and fixed to the shaft, an outer ring is bonded and fixed to the sleeve, and the inner ring is in contact with the flange portion;
A second rolling bearing disposed at a position spaced apart from the first rolling bearing in the axial direction of the shaft by a predetermined interval, an inner ring being bonded and fixed to the shaft, and an outer ring being bonded and fixed to the sleeve;
A first adhering groove formed in a contact portion with the first rolling bearing on the outer peripheral surface of the shaft;
A second bonding groove formed at a contact point with the second rolling bearing on the outer peripheral surface of the shaft;
A third bonding groove formed in a contact portion with the first rolling bearing on the inner peripheral surface of the sleeve;
A fourth bonding groove formed at a contact portion with the second rolling bearing on the inner peripheral surface of the sleeve;
Between the first rolling bearing and the second rolling bearing in the sleeve, a spacer portion that holds a distance between the first rolling bearing and the second rolling bearing at a predetermined distance is applied in the circumferential direction of the sleeve. In the manufacturing method of the bearing device that is in contact with and arranged to protrude radially inward of the sleeve,
In the axial direction of the rolling surface formed on the inner ring and the outer ring, the first bonding groove portion is provided with a rolling element interposed between the inner ring and the outer ring of the first rolling bearing. Formed on the flange side from the first central portion,
In the axial direction of the rolling surface formed on the inner ring and the outer ring, the second bonding groove portion is disposed between the inner ring and the outer ring of the second rolling bearing. Formed on the flange side from the second central portion,
The third bonding groove is formed closer to the spacer than the first central portion;
The fourth bonding groove is formed closer to the spacer than the second central portion;
Applying an adhesive to the first bonding groove;
Inserting the shaft through the first rolling bearing to bring the flange portion into contact with the inner ring of the first rolling bearing;
Applying an adhesive to the fourth bonding groove;
Inserting the second rolling bearing into the sleeve and bringing the spacer portion into contact with the outer ring of the second rolling bearing;
Applying an adhesive to the second bonding groove and the third bonding groove;
Inserting the shaft on which the first rolling bearing is attached to the sleeve to which the second rolling bearing is attached, and abutting the spacer portion with the outer ring of the first rolling bearing. A method for manufacturing a bearing device. A shaft having a flange portion formed in a cylindrical shape and having a diameter expanded at one end portion in the axial direction;
A cylindrical sleeve disposed coaxially with a predetermined interval from the outer peripheral surface of the shaft;
A first rolling bearing disposed between the shaft and the sleeve, wherein an inner ring is bonded and fixed to the shaft, an outer ring is bonded and fixed to the sleeve, and the inner ring is in contact with the flange portion;
A second rolling bearing disposed at a position spaced apart from the first rolling bearing in the axial direction of the shaft by a predetermined interval, an inner ring being bonded and fixed to the shaft, and an outer ring being bonded and fixed to the sleeve;
A first adhering groove formed in a contact portion with the first rolling bearing on the outer peripheral surface of the shaft;
A second bonding groove formed at a contact point with the second rolling bearing on the outer peripheral surface of the shaft;
A third bonding groove formed in a contact portion with the first rolling bearing on the inner peripheral surface of the sleeve;
A fourth bonding groove formed at a contact portion with the second rolling bearing on the inner peripheral surface of the sleeve;
Between the first rolling bearing and the second rolling bearing in the sleeve, a spacer portion that holds a distance between the first rolling bearing and the second rolling bearing at a predetermined distance is applied in the circumferential direction of the sleeve. In the manufacturing method of the bearing device that is in contact with and arranged to protrude radially inward of the sleeve,
In the axial direction of the rolling surface formed on the inner ring and the outer ring, the first bonding groove portion is provided with a rolling element interposed between the inner ring and the outer ring of the first rolling bearing. Formed on the flange side from the first central portion,
In the axial direction of the rolling surface formed on the inner ring and the outer ring, the second bonding groove portion is disposed between the inner ring and the outer ring of the second rolling bearing. Formed on the flange side from the second central portion,
The third bonding groove is formed closer to the spacer than the first central portion;
The fourth bonding groove is formed closer to the spacer than the second central portion;
Applying an adhesive to the third bonding groove;
Inserting the first rolling bearing into the sleeve and bringing the spacer portion into contact with the outer ring of the first rolling bearing;
Applying an adhesive to the first bonding groove;
Inserting the shaft through the sleeve to which the first rolling bearing is attached and bringing the flange portion into contact with the inner ring of the first rolling bearing;
Applying an adhesive to the second bonding groove and the fourth bonding groove;
And a step of inserting the second rolling bearing into the shaft and bringing the spacer portion into contact with the outer ring of the second rolling bearing .

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