JP2011208713A - Method of manufacturing rolling bearing arrangement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a rolling bearing arrangement which has a sufficient bonding strength and in which generation of outgassing is reduced and fluctuation in resonance frequency and fluctuation in torque are prevented.SOLUTION: A method of manufacturing a rolling bearing arrangement is provided that includes a thermal deformation process (step S2, S7) which causes into close contact with a shaft 13 by thermally deforming an inside circumferential edge portion of one end of axial direction of inner rings 3a, 3b by local laser irradiation in the fitted portion of each inner ring 3a, 3b of the two rolling bearings which are axially spaced and are concentrically arranged and the shaft 13 fitted into the inner rings 3a, 3b and a welding process (step S3, S8) which laser-welds the shaft 13 with the inside circumferential edge portion of the inner rings 3a, 3b brought into close contact with the shaft 13 by the thermal deformation process (step S2, S7).

Description

  The present invention relates to a method for manufacturing a rolling bearing device.

  Generally, a rolling bearing device is composed of a rolling bearing having an inner ring and an outer ring arranged coaxially, an inner cylinder fitted to the inner ring of the rolling bearing, and an outer cylinder fitting the outer ring of the rolling bearing. The cylinder and the outer cylinder are supported by a rolling bearing so as to be relatively rotatable (see, for example, Patent Document 1 and Patent Document 2). In the rolling bearing device described in Patent Document 1, a shaft (inner cylinder), an inner ring, a housing (outer cylinder), and an outer ring are joined by an adhesive, respectively. In the rolling bearing device described in Patent Document 2, the shaft and the inner ring are anaerobic. It is joined by a sex adhesive.

Japanese Patent Laid-Open No. 11-182543 JP 2000-346085 A

  However, the anaerobic adhesive has many outgas components and has a disadvantage that the curing time is long and the productivity is low. In addition, when the shaft and inner ring and the housing and outer ring are joined with an adhesive as in a conventional rolling bearing device, the rigidity of the adhesive fluctuates due to temperature changes, which changes the preload and the resonance frequency and torque. There is an inconvenience. Even when laser welding is performed, if the workpiece is chamfered or the gap between the workpieces is large, a large welding area is required, and displacement occurs due to shrinkage when the melted part is cured. There is a problem that the torque decreases.

  The present invention has been made in view of the above-described circumstances, and provides a method of manufacturing a rolling bearing device that has sufficient joint strength, reduces outgas generation, and prevents occurrence of resonance frequency fluctuation and torque fluctuation. For the purpose.

In order to achieve the above object, the present invention provides the following means.
The present invention provides the inner ring of at least one of the fitting portions of the inner rings of the two rolling bearings arranged coaxially with an interval in the axial direction and the first member fitted to the inner rings. A thermal deformation step in which a peripheral edge portion at one end in the axial direction is locally thermally deformed by laser irradiation and is brought close to the first member; and the inner ring brought close to the first member by the thermal deformation step Provided is a method of manufacturing a rolling bearing device including a welding step of laser welding a peripheral edge portion and the first member.

  According to the present invention, a rolling bearing device capable of relatively rotatably supporting the first member and the swing arm is manufactured by directly attaching a swing arm used for a magnetic recording device (HDD) or the like to the outer ring. .

  In this case, even if a gap is generated in the fitting portion between each inner ring and the first member due to a difference in dimensions or chamfering, one end of the inner ring in the axial direction is brought close to the first member by the thermal deformation process. The gap between the fitting portions can be reduced by the peripheral portion, and the fitting portions can be laser-welded without increasing the welding range by the welding process. Thereby, the shrinkage | contraction at the time of the welding location fuse | melted by laser irradiation hardens | cures can be reduced, the position shift of to-be-welded materials can be suppressed, and a fitting part can be joined reliably and accurately.

  Further, by joining the fitting portions by laser welding, it is possible to prevent outgassing as in the case of joining with an anaerobic adhesive, and it is possible to shorten the joining time and improve productivity. Further, according to laser welding, it is possible to avoid a change in preload due to a change in the rigidity of the adhesive due to a temperature change as in the case of joining with an adhesive, and to stabilize the resonance frequency and torque. Therefore, it is possible to manufacture a rolling bearing device that secures sufficient joint strength and reduces outgas generation and prevents resonance frequency fluctuation and torque fluctuation.

In the said invention, the said heat deformation process is good also as heat-deforming at least 3 or more places at intervals in the circumferential direction of the said inner ring | wheel.
By comprising in this way, the clearance gap of the three or more places of the circumferential direction in a fitting part can be made small by a thermal deformation process, and a fitting part can be joined in the circumferential direction balance by a welding process. In addition, it is preferable to heat-deform at equal intervals in the circumferential direction of the inner ring in the thermal deformation step.

In the above invention, the thermal deformation step includes a preload application step of applying a preload to the two rolling bearings by pressing the inner rings of the two rolling bearings in a direction relatively close to the axial direction. However, it is good also as carrying out the heat deformation of the said peripheral part of the said inner ring | wheel of the state pressed by the said preload provision process.
With this configuration, it is possible to easily manufacture a rolling bearing device in which the inner ring is pressed and joined to the first member by the thermal deformation process and the welding process and the preloaded state is maintained in a short time. it can.

  The present invention provides the shaft of the outer ring at least at one of the fitting portions between the outer rings of the two rolling bearings arranged coaxially with an interval in the axial direction and the second member for fitting the outer rings. A thermal deformation step in which a peripheral edge portion at one end in the direction is locally thermally deformed by laser irradiation so as to be close to the second member, and the peripheral edge of the outer ring brought close to the second member by the thermal deformation step Provided is a method of manufacturing a rolling bearing device including a welding step of laser welding a portion and the second member.

According to the present invention, a rolling bearing device capable of relatively rotatably supporting the second member and the swing arm is manufactured by directly attaching the swing arm to the inner ring.
In this case, even if a gap is generated in the fitting portion between each outer ring and the second member, the fitting portion is formed by the peripheral edge portion of one end in the axial direction of the outer ring that is brought close to the second member by the thermal deformation process. The fitting portion can be laser-welded without reducing the gap and without increasing the welding range by the welding process. Therefore, it is possible to manufacture a rolling bearing device in which misalignment between materials to be welded is suppressed and the fitting portions are joined reliably and accurately.

In the said invention, the said heat deformation process is good also as carrying out the heat deformation of at least 3 or more places at intervals in the circumferential direction of the said outer ring | wheel.
By comprising in this way, a fitting part can be balanced and joined to the circumferential direction. In addition, it is preferable to thermally deform at equal intervals in the circumferential direction of the outer ring in the thermal deformation step.

In the above invention, the thermal deformation step includes a preload applying step of applying a preload to the two rolling bearings by pressing the outer rings of the two rolling bearings in a direction relatively close to the axial direction. However, it is good also as thermally deforming the said peripheral part of the said outer ring | wheel in the state pressed by the said preload provision process.
By configuring in this way, it is possible to easily manufacture a rolling bearing device in which the outer ring is pressed and joined to the second member by the thermal deformation process and the welding process and the preloaded state is maintained in a short time. it can.

  The present invention provides a fitting portion between each inner ring of two rolling bearings arranged coaxially with an interval in the axial direction and a first member fitted to these inner rings, and the two rolling bearings. At least one of the inner ring of the fitting part of the outer ring and the second member for fitting these outer rings or the peripheral edge of one end of the outer ring in the axial direction is locally thermally deformed by laser irradiation to be changed. A thermal deformation step of bringing the first member or the second member close to each other, and the peripheral portion of the inner ring or the outer ring brought close to the first member or the second member by the thermal deformation step and the first A method for manufacturing a rolling bearing device including a welding step of laser welding the member or the second member is provided.

  According to the present invention, each outer ring of two rolling bearings in which the first member is fitted to each inner ring is fitted to the second member, and at least each of the inner ring and each outer ring is subjected to a thermal deformation process and a welding process. One is laser welded to the first member or the second member, whereby a rolling bearing device is manufactured in which the first member and the second member are relatively rotatably supported by two rolling bearings. The

  In this case, even if there is a gap in the fitting portion between each inner ring and the first member or the fitting portion between each outer ring and the second member, the axial direction of the inner ring or outer ring is caused by the thermal deformation process. The gap of the fitting portion can be reduced by the peripheral edge portion of the one end, and the fitting portion can be laser welded without increasing the welding range by the welding process.

In the said invention, the said heat deformation process is good also as heat-deforming at least 3 or more places at intervals in the circumferential direction of the same said inner ring | wheel or the said outer ring | wheel.
By comprising in this way, a fitting part can be balanced and joined to the circumferential direction.

Further, the invention includes a preload applying step of applying a preload to the two rolling bearings by pressing the inner rings or the outer rings of the two rolling bearings in a direction relatively close to the axial direction, The thermal deformation step may thermally deform the peripheral portion of the inner ring or the outer ring pressed by the preload applying step.
By comprising in this way, the rolling bearing apparatus by which the state which applied the preload was maintained can be manufactured easily in a short time.

  In the present invention, at least one of the first fitting portions of the inner ring of two rolling bearings arranged coaxially with an interval in the axial direction and the first member fitted to these inner rings. A thermal deformation step in which a peripheral portion of one end of the member in the axial direction is locally thermally deformed by laser irradiation so as to be close to the inner ring; and the first member that is brought close to the inner ring by the thermal deformation step. Provided is a method of manufacturing a rolling bearing device including a welding step of laser welding a peripheral edge portion and the inner ring.

  According to the present invention, even when there is a gap in the fitting portion, the gap in the fitting portion is reduced by the peripheral edge portion of the first member in the axial direction by the thermal deformation step, and the welding range is obtained by the welding step. The fitting portion can be laser welded without increasing the size.

In the said invention, the said heat deformation process is good also as heat-deforming at least 3 or more places at intervals in the circumferential direction of the same said 1st member.
In the thermal deformation step, it is preferable to perform thermal deformation at equal intervals in the circumferential direction of the first member.

  In the above invention, the welding step includes a preload applying step of applying a preload to the two rolling bearings by pressing the inner rings of the two rolling bearings in a direction relatively close to the axial direction. The peripheral portion of the first member and the inner ring pressed by the preload application step may be laser-welded.

  The present invention provides at least one second member of a fitting portion between each outer ring of two rolling bearings arranged coaxially with an interval in the axial direction and a second member for fitting these outer rings. A thermal deformation step in which a peripheral portion of one end of the axial direction is locally thermally deformed by laser irradiation and is brought close to the outer ring, and the peripheral edge of the second member brought close to the outer ring by the thermal deformation step Provided is a method for manufacturing a rolling bearing device including a welding step of laser welding the portion and the outer ring.

  According to the present invention, even if there is a gap in the fitting portion, the gap in the fitting portion is reduced by the peripheral edge portion of the second member in the axial direction by the thermal deformation step, and the welding range is obtained by the welding step. The fitting portion can be laser welded without increasing the size.

In the said invention, the said heat deformation process is good also as heat-deforming at least 3 or more places at intervals in the circumferential direction of the same said 2nd member.
In the thermal deformation step, it is preferable to perform thermal deformation at equal intervals in the circumferential direction of the second member.

  In the above invention, the welding step includes a preload application step of applying a preload to the two rolling bearings by pressing the outer rings of the two rolling bearings in a direction relatively close to the axial direction. In addition, the peripheral portion of the second member and the outer ring pressed in the preload applying step may be laser-welded.

  The present invention provides a fitting portion between each inner ring of two rolling bearings arranged coaxially with an interval in the axial direction and a first member fitted to these inner rings, and the two rolling bearings. At least one of the first member in the fitting portion between the outer ring and the second member for fitting these outer rings, or a peripheral portion of one end in the axial direction of the second member is locally irradiated by laser irradiation. A thermal deformation step in which the inner ring or the outer ring is brought close to the inner ring or the outer ring, and the peripheral portion of the first member or the second member brought into the proximity of the inner ring or the outer ring by the thermal deformation step; Provided is a method for manufacturing a rolling bearing device including a welding step of laser welding an inner ring or the outer ring.

  According to the present invention, even if there is a gap in the fitting portion, the gap in the fitting portion is reduced by the peripheral edge portion of one end of the first member or the second member in the axial direction by the thermal deformation process, The fitting portion can be laser-welded without increasing the welding range by the welding process.

In the said invention, the said heat deformation process is good also as carrying out the heat deformation of at least 3 or more places at intervals in the circumferential direction of the said 1st member or the said 2nd member.
In the thermal deformation step, it is preferable that the first member or the second member be thermally deformed at equal intervals in the circumferential direction.

  Further, the invention includes a preload applying step of applying a preload to the two rolling bearings by pressing the inner rings or the outer rings of the two rolling bearings in a direction relatively close to the axial direction, The welding step may be laser welding the peripheral portion of the first member or the second member and the inner ring or the outer ring pressed in the preload applying step.

  In the said invention, it is good also as including the post-welding process of carrying out laser welding by the spot diameter larger than the spot diameter of the laser beam by this welding process in the circumferential direction different from the welding location by the said welding process.

  By comprising in this way, the joint strength of a fitting part can be improved by a post-welding process. In this case, in the welding process, the material to be welded is relatively changed when the welded portion of the inner ring and the first member or the outer ring and the second member melted by the large spot diameter of the laser beam is cured and contracted. Even when a force acts, the fitting portion can be joined with a high joining strength while suppressing the displacement of the material to be welded by the fixing force of the welded parts joined by the thermal deformation process and the welding process.

  According to the present invention, there is an effect that it is possible to manufacture a rolling bearing device that has sufficient bonding strength, reduces outgas generation, and prevents occurrence of resonance frequency fluctuation and torque fluctuation.

It is a longitudinal cross-sectional view of the rolling bearing apparatus manufactured by the manufacturing method of the rolling bearing apparatus which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which expands and shows the fitting part of the inner ring | wheel and shaft of the rolling bearing of FIG. It is a longitudinal cross-sectional view which shows the state which thermally deformed the peripheral part of the inner ring | wheel of FIG. FIG. 4 is a plan view of an inner ring and a shaft of FIG. 3 viewed in the axial direction. It is a longitudinal cross-sectional view which shows a mode that a laser beam is irradiated to the heat deformation part of the inner ring | wheel by which heat deformation was carried out of FIG. It is a longitudinal cross-sectional view which shows a mode that the heat deformation part and shaft of the inner ring | wheel of FIG. 5 are laser-welded. It is the top view which looked at the inner ring and shaft of FIG. 6 in the axial direction. It is a flowchart of the manufacturing method of the rolling bearing apparatus which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which expands and shows the fitting part of the outer ring | wheel and sleeve of a rolling bearing which concerns on the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which thermally deformed the peripheral part of the outer ring | wheel of FIG. It is the top view which looked at the outer ring | wheel and sleeve of FIG. 10 in the axial direction. It is a longitudinal cross-sectional view which shows a mode that a laser beam is irradiated to the heat deformation part of the outer ring | wheel by which heat deformation was carried out of FIG. It is a longitudinal cross-sectional view which shows a mode that the heat deformation part and sleeve of the outer ring | wheel of FIG. 12 are laser-welded. It is the top view which looked at the outer ring | wheel and sleeve of FIG. 13 in the axial direction. FIG. 6 is a plan view of an outer ring and a thermally deformed sleeve as viewed in the axial direction in a method of manufacturing a rolling bearing device according to a modification of each embodiment of the present invention. FIG. 16 is a plan view showing a state in which the outer ring and the thermally deformed sleeve of FIG. 15 are laser-welded. It is a longitudinal cross-sectional view of the rolling bearing apparatus manufactured by the manufacturing method of the rolling bearing apparatus which concerns on the modification of the 1st Embodiment of this invention.

[First Embodiment]
Hereinafter, a method for manufacturing a rolling bearing device according to a first embodiment of the present invention will be described with reference to the drawings.
The method for manufacturing a rolling bearing device according to the present embodiment manufactures a rolling bearing device for swinging a swing arm or the like used in a magnetic recording device (HDD), an optical recording device, or the like.

  As the rolling bearing device 10, for example, as shown in FIG. 1, a shaft (first member) 13 is formed by a first rolling bearing 1 </ b> A and a second rolling bearing 1 </ b> B that are arranged coaxially with an interval in the axial direction. And the sleeve (second member) 23 are supported so as to be relatively rotatable. The two rolling bearings 1A, 1B hold a plurality of rolling elements 7 in a ring-shaped space between the inner rings 3a, 3b and the outer rings 5a, 5b so that they can roll at predetermined intervals in the circumferential direction.

  In this manufacturing method, the inner ring 3a, 3b of each rolling bearing 1A, 1B fitted with the shaft 13 is locally thermally deformed by laser irradiation, and the inner ring 3a is thermally deformed by the heat deformation process. , 3b and a welding step of laser welding the fitting portion of the shaft 13.

  As shown in FIG. 2, the thermal deformation process is performed by irradiating laser light obliquely from the outside in the radial direction near the center in the radial direction on the axial end faces of the inner rings 3a and 3b. The peripheral edge portions (peripheral edge portions) 4 a and 4 b are locally thermally deformed to be radially inward, that is, close to the outer peripheral surface of the shaft 13. A symbol D indicates a thermally deformed portion thermally deformed by laser irradiation.

  Further, in the thermal deformation process, as shown in FIG. 4, among the inner peripheral edge portions 4a and 4b of the inner rings 3a and 3b, three portions are thermally deformed at substantially equal intervals in the circumferential direction. In the thermal deformation process, the heat-deformed portions D of the inner rings 3a and 3b that have been heat-deformed may have a minute gap close to the state in contact with the outer peripheral surface of the shaft 13, or The outer peripheral surface of the shaft 13 may be contacted and slightly joined.

  As shown in FIG. 5, the welding process irradiates laser light obliquely from the outside in the radial direction around each heat-deformed portion D of the inner rings 3 a and 3 b brought close to the outer peripheral surface of the shaft 13 by the heat-deformation process. As shown in FIG. 6, the portions where the end faces of the inner rings 3a and 3b intersect with the outer peripheral surface of the shaft 13 are joined by fillet welding. A symbol W indicates a welded portion that is laser-welded.

  In the welding process, as shown in FIG. 7, the positions shifted in the radial direction with respect to the three heat-deformed portions D of the inner rings 3 a and 3 b thermally deformed by the heat-deformation step, for example, the heat-deformed portions D and A weld W is formed near the boundary with the outer peripheral surface of the shaft 13.

Hereinafter, a method for manufacturing the rolling bearing device 10 will be described with reference to the flowchart of FIG.
First, the shaft 13 is fitted to the inner ring 3a of the first rolling bearing 1A, and the inner ring 3a is fitted to the flange-shaped flange portion 15 projecting radially outward over the entire circumference provided at one end of the shaft 13 in the axial direction. The end face is abutted (step S1). Hereinafter, this fitting portion is referred to as a “fitting portion 29A”.

  Next, as shown in FIG. 2, a laser beam is irradiated to the end surface of the fitting portion 29A opposite to the end surface of the inner ring 3a abutted against the flange portion 15. In this case, the inner peripheral edges 4a and 4b of the inner rings 3a and 3b may have a chamfered shape as shown in the figure, or may have a shape that is not chamfered.

  As shown in FIG. 3, the end surface of the inner ring 3a irradiated with the laser beam has a crater shape in which the outer periphery rises due to convection and hardening of the molten metal and the inner periphery 4a is brought close to the shaft 13 side. It becomes. As a result, the thermally deformed portion D of the inner ring 3a that has been thermally deformed is substantially in contact with or slightly joined to the outer peripheral surface of the shaft 13 (step S2, heat deformation step of the inner ring 3a). Similarly, the other two places in the circumferential direction of the inner peripheral edge 4a of the inner ring 3a are thermally deformed.

  Subsequently, as shown in FIG. 5, the laser beam is irradiated around each of the thermally deformable portions D of the inner ring 3 a that is brought close to the shaft 13. Thereby, the vicinity of the boundary between each heat-deformed portion D of the inner ring 3a and the shaft 13 is laser-welded, and the fitting portion 29A is joined as shown in FIG. 6 (step S3, welding process of the inner ring 3a).

  In this case, laser welding is performed to reduce the laser power and reduce the width of the welding range (spot diameter) by performing laser welding on the portion where the gap of the fitting portion 29A due to chamfering is eliminated by the thermal deformation portion D of the inner ring 3a. ) Can be reduced. Thereby, shrinkage | contraction at the time of the fusion | melting location melt | dissolved by laser irradiation hardening | curing can be reduced and the position shift of the inner ring | wheel 3a and the shaft 13 can be suppressed, ensuring the joining strength of 29 A of fitting parts. Moreover, the fitting part 29A can be balanced and joined to the circumferential direction by laser welding the three heat-deformed parts D in the circumferential direction of the inner peripheral edge 4a.

  Next, the outer ring 5b of the second rolling bearing 1B is fitted into a sleeve 23 having a convex portion (hereinafter referred to as a “spacer portion”) 27 protruding inward in the radial direction substantially at the center of the fitting hole 25 in the axial direction. Then, the end face of the outer ring 5b is abutted against the spacer portion 27 (step S4). Hereinafter, this fitting portion is referred to as “fitting portion 29D”. For example, an adhesive is applied to the fitting portion 29 </ b> D in advance on the outer peripheral surface of the outer ring 5 b or the fitting hole 25 of the sleeve 23.

  Subsequently, in a state where the flange portion 15 of the shaft 13 is fixed vertically downward, the sleeve 23 is assembled to the shaft 13 from the opposite side of the fitting portion 29D in the axial direction. The outer ring 5a of the first rolling bearing 1A joined to the shaft 13 is fitted into the fitting hole 25 of the sleeve 23, and the end surface of the outer ring 5a is abutted against the spacer portion 27 (hereinafter, this fitting portion is referred to as “ The fitting portion 29C ”), the shaft 13 is fitted to the inner ring 3b of the second rolling bearing 1B joined to the sleeve 23 (hereinafter, this fitting portion is referred to as“ fitting portion 29B ”). An assembly of the rolling bearing device 10 is formed (step S5). For example, an adhesive is applied to the fitting portion 29C in the same manner as the fitting portion 29D.

Next, the fitting portion 29B is joined by laser welding.
Here, a gap corresponding to the length of the spacer portion 27 is formed between the inner rings 3a and 3b by the spacer portion 27 sandwiched between the outer rings 5a and 5b of the rolling bearings 1A and 1B. Therefore, the inner ring 3a and the inner ring 3b are pressed in a direction in which they are close to each other, and a preload is applied to the rolling bearings 1A and 1B.

  In this case, since the inner ring 3a of the first rolling bearing 1A is abutted against the flange portion 15 of the shaft 13, the inner ring 3b of the second rolling bearing 1B is brought close to the inner ring 3a in the axial direction. Pre-loading can be applied to both rolling bearings 1A and 1B simply by pressing.

  Therefore, the inner ring 3b of the second rolling bearing 1B is pressed in the axial direction (step S6, preload application step), and in this state, the fitting portion 29B is subjected to a heat deformation step and a welding step. Specifically, the end surface of the inner ring 3b is irradiated with laser light (see FIG. 2), and the heat-deformed portion D of the inner peripheral edge 4b is substantially in contact with or slightly joined to the outer peripheral surface of the shaft 13 (step S7, inner ring 3b). (See FIG. 3). Similarly, the other two places in the circumferential direction of the inner peripheral edge 4b of the inner ring 3b are thermally deformed.

  Subsequently, the laser beam is irradiated around each of the thermally deformable portions D of the inner ring 3b close to the shaft 13 (see FIG. 5), and laser welding is performed near the boundary between each of the thermally deformable portions D of the inner ring 3b and the shaft 13. (Step S8, welding process of the inner ring 3b, see FIG. 6). Thereby, the fitting part 29B is joined and the state where the preload was applied to the rolling bearings 1A and 1B is maintained.

  And the rolling bearing apparatus 10 is completed by joining other fitting part 29C, 29D with an adhesive agent (step S9). For example, when an anaerobic adhesive is used as the adhesive, the adhesive is cured by being left for a predetermined time, and the fitting portions 29C and 29D are joined. When a thermosetting adhesive is used as the adhesive, the adhesive is cured by applying predetermined heat, and the fitting portions 29C and 29D are joined.

  As described above, according to the manufacturing method of the rolling bearing device 10 according to the present embodiment, even if there is a gap in each fitting portion 29A, 29B due to a difference in dimensions or chamfering, the fitting is performed by the thermal deformation process. By laser-welding the portion where the gap of the joint portion is eliminated (the portion where the gap is reduced) by a welding process, the positional deviation between the inner rings 3a, 3b and the shaft 13 is suppressed with a small spot diameter while ensuring the joint strength, The rolling bearing device 10 in which the fitting portions 29A and 29B are reliably and accurately joined can be manufactured.

  Moreover, compared with the case where all fitting part 29A, 29B, 29C, 29D is joined by an anaerobic adhesive agent, generation | occurrence | production of outgas is reduced, joining time can be shortened and productivity can be improved. Further, according to laser welding, it is possible to avoid a change in preload due to a change in the rigidity of the adhesive due to a temperature change as in the case of joining with an adhesive, and to stabilize the resonance frequency and torque.

[Second Embodiment]
Next, a method for manufacturing a rolling bearing device according to the second embodiment of the present invention will be described.
In the manufacturing method of the rolling bearing device according to the present embodiment, the outer ring 5a, 5b is locally thermally deformed by laser irradiation instead of the inner rings 3a, 3b in the thermal deformation process, and the welding process is thermally deformed by the thermal deformation process. This is different from the first embodiment in that laser welding is performed on the fitted portion between the outer rings 5a and 5b and the sleeve 23.
In the following, portions that share the same configuration with the manufacturing method of the rolling bearing device according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 9, the thermal deformation process irradiates laser light obliquely from the inside in the radial direction to the vicinity of the approximate center in the radial direction on the axial end faces of the outer rings 5a and 5b. The peripheral edge portions (peripheral edge portions) 6 a and 6 b are locally thermally deformed to bring the heat deformable portion D close to the outer side in the radial direction, that is, the fitting hole 25 of the sleeve 23. Further, in the thermal deformation process, as shown in FIG. 11, the outer peripheral edges 6a, 6b of the outer rings 5a, 5b are thermally deformed at three locations at substantially equal intervals in the circumferential direction.

  As shown in FIG. 12, the welding process irradiates laser light obliquely from the inside in the radial direction around each heat-deformed portion D of the outer rings 5a and 5b brought close to the fitting hole 25 of the sleeve 23 by the heat-deformation process. And as shown in FIG. 13, the part which the end surface of outer ring | wheel 5a, 5b and the fitting hole 25 of the sleeve 23 cross | intersect is joined by fillet welding.

In the welding process, as shown in FIG. 14, the positions shifted in the radial direction with respect to the three heat-deformed portions D of the outer rings 5 a and 5 b thermally deformed by the heat-deformation process, for example, the heat-deformed portions D and A welded portion W is formed in the vicinity of the boundary between the sleeve 23 and the fitting hole 25.
The fitting portions 29A and 29B are joined with an adhesive, for example.

  According to the manufacturing method of the rolling bearing device configured as described above, even when there is a gap in each fitting portion 29C, 29D due to a difference in dimensions or chamfering, the outer ring 5a, 5b is thermally deformed by the heat deformation process. The portion where the gap between the fitting portions 29C and 29D is eliminated by the portion D (the portion where the gap is reduced) is laser-welded by a welding process, thereby ensuring the bonding strength of the fitting portions 29C and 29D and the outer ring with a small spot diameter. It is possible to manufacture a rolling bearing device in which the misalignment between 5a and 5b and the sleeve 23 is suppressed and the fitting portions 29C and 29D are reliably and accurately joined.

  In the present embodiment, as the second member, a sleeve that does not include the spacer portion 27 is employed on the inner surface of the fitting hole 25, and a ring-shaped spacer is provided between the inner rings 3a and 3b of the rolling bearings 1A and 1B. It is good also as a structure to pinch | interpose. In this case, since a gap corresponding to the length of the spacer is formed between the outer rings 5a and 5b, the thermal deformation process and the welding process are performed in a state where the outer rings 5a and 5b are pressed in the direction of approaching each other. Good.

Moreover, each said embodiment can be deform | transformed as follows.
For example, as a first modified example, a method for manufacturing a rolling bearing device uses a laser produced by a welding process at a position different from the welded portion (welded spot) W in the inner ring 3a, 3b or the outer ring 5a, 5b by a welding process in the circumferential direction. It is good also as including the post-welding process further laser-welded by the spot diameter (laser power higher than the laser power at the time of a welding process) larger than the spot diameter of light.

  By doing in this way, the joining strength of fitting part 29A, 29B or fitting part 29C, 29D can be improved by a post-welding process. In this case, when laser welding is performed with high laser power in the post-welding process, a force that relatively changes the inner rings 3a and 3b and the shaft 13 or the outer rings 5a and 5b and the sleeve 23 acts due to shrinkage of the welded portion. However, it is possible to join the fitting portions 29A and 29B or the fitting portions 29C and 29D with high joining strength while suppressing these positional shifts by the fixing force of the welded portion W joined by the thermal deformation process and the welding process. it can.

  In each of the above embodiments and the first modification, the inner ring 3a, 3b or the outer ring 5a, 5b is subjected to a thermal deformation process and a welding process. For example, as the second modification, depending on the shape The shaft (first member) or the sleeve (second member) may be subjected to a thermal deformation process and a welding process.

  In this case, for example, as shown in FIG. 15, in the fitting portions 129 </ b> C and 129 </ b> D between the outer rings 5 a and 5 b and the sleeve 123, the thermal deformation process irradiates one end in the axial direction of the sleeve 123 with laser light. The inner peripheral edge portions (peripheral edge portions) 124a and 124b of 25 may be locally thermally deformed to bring the heat deformable portion D close to the outer rings 5a and 5b. Further, as shown in FIG. 16, the welding process is performed by laser welding the vicinity of the boundary between the thermally deformed portion D of the sleeve 123 and the outer rings 5a and 5b which are brought close to the outer rings 5a and 5b by the thermal deformation process. 129C and 129D may be joined.

  In this case, it is preferable that the axial length of the outer rings 5a and 5b is longer than the axial length of the sleeve 123 in the state where the outer rings 5a and 5b and the sleeve 123 are assembled, or approximately the same length. . When the lengths of the outer rings 5a and 5b and the sleeve 12 are approximately the same, laser welding may be performed so that their end faces are substantially flush.

Moreover, in this modification, it is also possible to perform laser welding at a position different from the welded portion W in the sleeve 123 in the welding process in the circumferential direction by a post-welding process with a spot diameter larger than the spot diameter of the laser beam in the welding process. Good.
The same applies to the fitting portion between the inner rings 3a, 3b and the shaft.

  As mentioned above, although each embodiment and each modification of this invention were explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment or a modification, The range which does not deviate from the summary of this invention Design changes, etc. are also included. For example, the present invention is not limited to those applied to the above-described embodiments and modifications, and may be applied to embodiments in which these embodiments and modifications are appropriately combined, and is particularly limited. is not.

  Further, for example, in the above-described embodiments and modifications, the fitting portions 29A, 29B or the fitting portions 29C, 29D are joined by the thermal deformation process and the welding process, but the fitting portions 29A, 29B, 29C are joined. 29D may be joined by a thermal deformation process and a welding process. Further, for example, in each of the above-described embodiments and modifications, the three portions in the circumferential direction in the fitting portion are thermally deformed and laser-welded. For example, two or less in the circumferential direction or the circumferential direction It is good also as carrying out laser welding by carrying out the heat deformation of four or more places. Moreover, in the same fitting part 29A, 29B, 29C, 29D, it is good also as joining using the laser welding by the heat deformation process and the welding process, and adhesion | attachment by an adhesive agent together.

  Moreover, in each said embodiment and each modification, although the case where the rolling bearing apparatus 10 provided with the shaft 13 and the sleeve 23 by a heat deformation process and a welding process was illustrated and demonstrated, it replaced with this, for example, A rolling bearing device including only one of the shaft 13 and the sleeve 23 may be manufactured by a thermal deformation process and a welding process.

  For example, in a rolling bearing device 110 that does not include the sleeve 23 as shown in FIG. 17, a ring-shaped spacer 127 is sandwiched between the outer rings 5a and 5b of the rolling bearings 1A and 1B, and the inner rings 3a and 3b are brought close to each other. The preload may be applied by pressing the Moreover, what is necessary is just to give a heat deformation process and a welding process to at least one place of fitting part 29A, 29B of inner ring | wheel 3a, 3b and the shaft 13. FIG. In this way, it is possible to manufacture the rolling bearing device 110 that can directly attach the swing arm to the outer rings 5a and 5b and can relatively rotatably support the shaft 13 and the swing arm with a stable resonance frequency and torque. it can.

  On the other hand, for a rolling bearing device that does not include the shaft 13, a ring-shaped spacer portion is sandwiched between the inner rings 3a and 3b of the rolling bearings 1A and 1B, and the outer rings 5a and 5b are pressed in a direction to approach each other to apply preload. And it is sufficient. In addition, a heat deformation process and a welding process may be performed on at least one of the fitting portions 29C and 29D between the outer rings 5a and 5b and the sleeve 23. Also in this modification, it is good also as performing a post-welding process.

DESCRIPTION OF SYMBOLS 1A 1st rolling bearing 1B 2nd rolling bearing 3a, 3b Inner ring | wheel 4a, 4b, 124a, 124b Inner periphery part (periphery part)
5a, 5b Outer ring 6a, 6b Outer peripheral edge (peripheral edge)
7 Rolling elements 10, 110 Rolling bearing device 13 Shaft (first member)
23,123 Sleeve (second member)
29A, 29B, 29C, 29D, 129C, 129D Fitting portion S2, S7 Thermal deformation process S3, S8 Welding process S6 Preload application process

Claims (19)

One end of the inner ring in the axial direction of at least one of the fitting portions of the inner rings of the two rolling bearings arranged coaxially with an interval in the axial direction and the first member fitted to the inner rings. A thermal deformation step in which the peripheral portion of the region is locally thermally deformed by laser irradiation and is brought close to the first member;
A method of manufacturing a rolling bearing device, comprising: a welding step of laser welding the peripheral edge portion of the inner ring and the first member brought close to the first member by the thermal deformation step.   The method of manufacturing a rolling bearing device according to claim 1, wherein the thermal deformation step thermally deforms at least three locations at intervals in a circumferential direction of the same inner ring. Including a preloading step of applying a preload to the two rolling bearings by pressing the inner rings of the two rolling bearings in a direction relatively close to the axial direction;
The method for manufacturing a rolling bearing device according to claim 1 or 2, wherein the thermal deformation step thermally deforms the peripheral edge portion of the inner ring pressed by the preload application step. One end of the outer ring in the axial direction of at least one of the fitting portions between the outer rings of the two rolling bearings arranged coaxially with an interval in the axial direction and the second member for fitting the outer rings. A thermal deformation step in which a peripheral portion is locally thermally deformed by laser irradiation and is brought close to the second member;
A method of manufacturing a rolling bearing device, comprising: a welding step of laser welding the peripheral edge portion of the outer ring and the second member brought close to the second member by the thermal deformation step.   The method of manufacturing a rolling bearing device according to claim 5, wherein the thermal deformation step thermally deforms at least three locations at intervals in the circumferential direction of the same outer ring. Including a preload application step of applying a preload to the two rolling bearings by pressing the outer rings of the two rolling bearings in a direction relatively close to the axial direction;
The method for manufacturing a rolling bearing device according to claim 4 or 5, wherein the thermal deformation step thermally deforms the peripheral edge portion of the outer ring pressed by the preload applying step. Fitting portions of the inner rings of the two rolling bearings arranged coaxially with an interval in the axial direction and the first member fitted to the inner rings, and the outer rings of the two rolling bearings and these The first member is formed by locally thermally deforming a peripheral portion of one end in the axial direction of the inner ring or the outer ring in at least one portion of the fitting portion with the second member to which the outer ring is fitted. Or a thermal deformation step to bring it close to the second member;
A welding step of laser welding the peripheral portion of the inner ring or the outer ring and the first member or the second member brought close to the first member or the second member by the thermal deformation step; A method for manufacturing a rolling bearing device.   The method of manufacturing a rolling bearing device according to claim 7, wherein the thermal deformation step thermally deforms at least three locations at intervals in a circumferential direction of the same inner ring or outer ring. Including a preload application step of applying a preload to the two rolling bearings by pressing the inner rings or the outer rings of the two rolling bearings in a direction relatively close to the axial direction;
The method for manufacturing a rolling bearing device according to claim 7 or 8, wherein the thermal deformation step thermally deforms the peripheral portion of the inner ring or the outer ring pressed by the preload applying step. The shaft of the first member in at least one of the fitting portions of the inner rings of two rolling bearings arranged coaxially with an interval in the axial direction and the first member fitted to the inner rings. A thermal deformation step in which the peripheral edge of one end in the direction is locally thermally deformed by laser irradiation and is brought close to the inner ring;
A method for manufacturing a rolling bearing device, comprising: a welding step of laser welding the peripheral edge portion of the first member brought close to the inner ring and the inner ring by the thermal deformation step.   The method of manufacturing a rolling bearing device according to claim 10, wherein the thermal deformation step thermally deforms at least three locations at intervals in the circumferential direction of the same first member. Including a preloading step of applying a preload to the two rolling bearings by pressing the inner rings of the two rolling bearings in a direction relatively close to the axial direction;
The method for manufacturing a rolling bearing device according to claim 10 or 11, wherein the welding step laser-welds the peripheral portion of the first member and the inner ring pressed by the preload applying step. The axial direction of the second member in at least one of the fitting portions between the outer rings of the two rolling bearings arranged coaxially with an interval in the axial direction and the second member for fitting the outer rings. A thermal deformation step in which the peripheral edge of one end of the is locally thermally deformed by laser irradiation and is brought close to the outer ring, and
A method of manufacturing a rolling bearing device, comprising: a welding step of laser welding the peripheral edge portion of the second member brought close to the outer ring and the outer ring by the thermal deformation step.   The method of manufacturing a rolling bearing device according to claim 13, wherein the thermal deformation step thermally deforms at least three or more locations at intervals in a circumferential direction of the same second member. Including a preload application step of applying a preload to the two rolling bearings by pressing the outer rings of the two rolling bearings in a direction relatively close to the axial direction;
The method for manufacturing a rolling bearing device according to claim 13 or 14, wherein the welding step laser-welds the peripheral portion of the second member and the outer ring pressed by the preload applying step. Fitting portions of the inner rings of the two rolling bearings arranged coaxially with an interval in the axial direction and the first member fitted to the inner rings, and the outer rings of the two rolling bearings and these The peripheral part of the one end of the axial direction of the 1st member or the 2nd member of at least one part of the fitting part with the 2nd member which fits the outer ring of this is locally thermally deformed by laser irradiation. A thermal deformation step of bringing the inner ring or the outer ring close to the inner ring,
A rolling bearing device comprising: a welding step of laser welding the peripheral portion of the first member or the second member brought close to the inner ring or the outer ring and the inner ring or the outer ring by the thermal deformation step. Production method.   The method of manufacturing a rolling bearing device according to claim 16, wherein the thermal deformation step thermally deforms at least three or more locations at intervals in a circumferential direction of the same first member or the second member. Including a preload application step of applying a preload to the two rolling bearings by pressing the inner rings or the outer rings of the two rolling bearings in a direction relatively close to the axial direction;
The said welding process laser-welds the said outer ring | wheel or the said outer ring | wheel of the state pressed by the said peripheral part of the said 1st member or the said 2nd member, and the said preload provision process. Method of rolling bearing device of the present invention.   19. The post-welding process according to claim 1, further comprising a post-welding process in which laser welding is performed with a spot diameter larger than a spot diameter of the laser beam by the welding process at a position that is different from a welding position by the welding process in the circumferential direction. A method of manufacturing a rolling bearing device.

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