JP2010054004A - Rolling bearing unit manufacturing method, and rolling bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize quality without causing a hardening failure of adhesive. <P>SOLUTION: This manufacturing method for a rolling bearing unit 10 comprises: a fitting step of fitting rolling bearings 1A, 1B to a shaft 13 or a sleeve 23; an applying step of applying adhesive to an inside recessed portion 34a, an inside recessed portion 34b, an outside recessed portion 36a, and an outside recessed portion 36b which are annularly formed at positions where chamfered portions 4a, 6a, 6b of the rolling bearings 1A, 1B are opposed to chamfered portions 4a, 6a, 6b of the shaft 13 or the sleeve 23, by peripheral grooves 14a, 14b or cutout portions 26a, 26b provided in the whole periphery, with the rolling bearings 1A, 1B fitted on the shaft 13 or the sleeve 23 by the fitting step; and a hardening step of hardening the adhesive. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rolling bearing unit and a manufacturing method thereof.

  In general, a rolling bearing device is known in which an inner ring of a shaft and a bearing and an outer ring of a sleeve and a bearing are fixed by press-fitting using an adhesive or an adhesive embedded in a gap (see, for example, Patent Document 1).

According to the bearing device of Patent Document 1, an adhesive is applied to the inner diameter surface of the inner ring of the bearing and the outer diameter surface of the outer ring when the device is assembled, and the bearing is bonded and fixed to the shaft and the swing member. ing.
As the adhesive, for example, an anaerobic adhesive or an ultraviolet curable anaerobic adhesive is used.

JP 2001-214942 A

  However, in a bearing device assembled using an adhesive, if the adhesive is forgotten to be assembled, or if it is an anaerobic adhesive, the adhesive is applied before each component is combined and pre-pressed. There is a problem that hardens. In addition, there is a problem in that omission occurs or quality varies depending on the amount and cleanliness of the adhesive applied. Furthermore, when the adhesive is applied in a range that interferes with the rolling surface, there is a disadvantage in that the deformation of the bearing is caused by the shrinkage of the adhesive, and the fluctuation of the torque becomes large.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a rolling bearing unit having a stable quality without causing hardening failure of an adhesive and a method for manufacturing the same.

In order to achieve the above object, the present invention provides the following means.
The present invention provides a fitting step for fitting a bearing to a shaft or a sleeve, and a chamfered portion of the bearing and the shaft or the sleeve in a state in which the bearing is fitted to the shaft or the sleeve by the fitting step. Of a rolling bearing unit comprising: an application step of applying an adhesive to an annular recess formed by a notch provided over the entire circumference at a position opposite to the chamfered portion; and a curing step of curing the adhesive A manufacturing method is provided.

  According to the present invention, the bearing and the shaft or the bearing and the sleeve are fixed by adhering the chamfered portion of the bearing and the notch portion of the shaft or the sleeve with the adhesive applied to the concave portion. Since the concave portion is exposed to the axial end of the bearing in the state of being fitted in the fitting step, the adhesive is easily applied in the application step, and the adhesive is squeezed out during assembly. There is no such inconvenience. Therefore, variation in the coating amount can be prevented, and occurrence of poor curing in the curing step can be suppressed. Thereby, it is possible to assemble a rolling bearing unit having a stable quality.

  Further, it is possible to prevent the adhesive from interfering with the rolling surface of the rolling element as in the case where the adhesive is applied to the inner peripheral surface of the inner ring of the bearing and the outer peripheral surface of the outer ring. Thereby, it is possible to prevent the rolling surface from being distorted due to the shrinkage of the adhesive and to prevent torque fluctuation.

In the above invention, the adhesive may be an anaerobic adhesive, and the curing step may leave the anaerobic adhesive applied to the recess in the air for a predetermined time.
According to such a configuration, the shaft or sleeve and the bearing can be fixed by a simple method.

  Moreover, in the said invention, the said adhesive material is an ultraviolet curable adhesive, and the said hardening step is good also as irradiating an ultraviolet-ray over the predetermined time to the said ultraviolet curable adhesive apply | coated to the said recessed part.

  According to such a configuration, the ultraviolet curable adhesive can be rapidly cured from the outside while combining the rolling bearing units, and the assembly time can be shortened. Further, unlike the thermosetting adhesive, heating is not required at the time of curing, and the occurrence of distortion of the rolling bearing unit due to thermosetting can be prevented. As a means for irradiating ultraviolet rays, for example, a UV irradiator can be used.

Moreover, in the said invention, the said adhesive material is a metal nano paste, and the said hardening step is good also as heating and hardening the said metal nano paste apply | coated to the said recessed part.
According to such a configuration, since the metals are bonded together, generation of outgas can be suppressed. In addition, it is possible to improve the conductivity of the rolling bearing unit and to avoid inconvenience due to electrostatic charging.

Moreover, in the said invention, it is good also as providing the preloading step which preloads the said bearing after the said application | coating step, and the said hardening step being implemented in the state which applied preload by the said preloading step.
According to such a configuration, since the preload is maintained by adhesion, it is possible to prevent the preload from being lost and prevent the rotation accuracy of the rolling bearing unit from being deteriorated.

The present invention provides a rolling bearing unit in which an adhesive for fixing a shaft or a sleeve and a bearing is applied to a recess exposed to the outside in a state where the bearing is fitted to the shaft or the sleeve.
According to the present invention, it is possible to provide a rolling bearing unit with a stable quality without forgetting to apply an adhesive or curing failure.

  According to the present invention, it is possible to stabilize the quality without causing poor curing of the adhesive.

Hereinafter, a rolling bearing unit 10 and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the drawings.
The rolling bearing unit 10 according to the present embodiment is a rolling bearing unit for a swing arm, for example.

  As shown in FIGS. 1 to 3, the rolling bearing unit 10 includes a first rolling bearing (bearing) 1 </ b> A and a second rolling bearing (bearing) 1 </ b> B (hereinafter referred to as axially spaced apart). The first rolling bearing 1A and the second rolling bearing 1B are collectively referred to as “rolling bearings 1A and 1B”), the shaft 13 fitted to these rolling bearings 1A and 1B, and the rolling bearings 1A and 1B. And a cylindrical sleeve 23 having a fitting hole 25 for fitting the two.

  The rolling bearings 1A and 1B are for rotating the shaft 13 and the sleeve 23 relatively. The first rolling bearing 1A includes a plurality of rolling elements that are arranged coaxially and arranged in an annular space between the inner ring 3a and the outer ring 5a, and between the inner ring 3a and the outer ring 5a in the circumferential direction. 7.

  The inner ring 3a includes an inner ring chamfered portion 4a in which inner peripheral edges of both end portions are chamfered over the entire circumference. The inner ring chamfered portion 4a is an inclined surface inclined at an angle of about 45 °. Further, the outer ring 5a includes an outer ring chamfered portion 6a in which outer peripheral edges of both end portions are chamfered over the entire circumference. The outer ring chamfered portion 6a is an inclined surface inclined at an angle of about 45 °. Hereinafter, the inner ring chamfered portion 4a and the outer ring chamfered portion 6a are collectively referred to as “chamfered portions 4a, 6a”.

Further, a deep groove type or angular type inner ring raceway is provided on the outer peripheral surface of the inner ring 3a, and a deep groove type or angular type outer ring raceway is provided on the inner peripheral surface of the outer ring 5a.
Note that the second rolling bearing 1B has the same configuration as the first rolling bearing 1A, and a description thereof will be omitted.

  The shaft 13 is a substantially cylindrical member, and includes a screw hole 15 extending in the axial direction at one end and a protrusion 17 for forming an external screw protruding in the axial direction at the other end. The other end of the shaft 13 is provided with a flange-like flange portion 19 that protrudes outward in the radial direction over the entire circumference. A first rolling bearing 1 </ b> A and a second rolling bearing 1 </ b> B are fitted into the shaft 13 in order from the flange portion 19 side.

  On the cylindrical surface of the shaft 13, circumferential grooves (notches) 14 a and 14 b that are recessed over the entire circumference are formed at two locations with an interval in the axial direction. The circumferential grooves 14a and 14b have inclined surfaces that are inclined at an angle of about 45 ° from the cylindrical surface. The circumferential groove 14a is provided at a position facing the inner ring chamfered portion 4a far from the flange portion 19 of the first rolling bearing 1A, and the circumferential groove 14b is located far from the flange portion 19 of the second rolling bearing 1B. It is provided at a position facing the inner ring chamfered portion 4b.

  In a state where the rolling bearings 1A and 1B are fitted to the shaft 13, an annular inner recess 34a is formed by the inner ring chamfered portion 4a and the inclined surface of the circumferential groove 14a, and the inner ring chamfered portion 4b and the inclined groove 14b are inclined. An annular inner recess 34b is formed by the surface. These inner recesses 34a and 34b are circumferential grooves each having a substantially V-shaped cross section.

  An adhesive (adhesive) is applied to the inner recesses 34a and 34b so as to fill the recesses, and the inner ring chamfered portion 4a and the inclined surface of the circumferential groove 14a, and the inner ring chamfered portion 4b and the inclined surface of the circumferential groove 14b are formed. Each is bonded by an adhesive. Thereby, the shaft 13 and the inner rings 3a and 3b are fixed, respectively. As the adhesive, for example, an ultraviolet curable adhesive is used. It is desirable that the inner recesses 34a and 34b have a depth that does not interfere with the rolling surfaces of the rolling elements 7 of the rolling bearings 1A and 1B on the side of the inner rings 3a and 3b.

  The rolling bearing unit 10 according to the present embodiment is fixed in a state in which the inner rings 3a and 3b are pressed in directions close to each other. As a result, the rolling bearings 1A and 1B are preloaded, and the inner rings 3a and 3b and the outer rings 5a and 5b are in contact with the rolling elements 7 without any gaps.

  On the inner surface of the fitting hole 25 of the sleeve 23, a convex portion 27 that protrudes inward is provided at the approximate center in the axial direction. In the fitting hole 25, the first rolling bearing 1A is fitted on one side in the axial direction with the convex part 27 interposed therebetween, and the second rolling bearing 1B is fitted on the other side, and the end faces of the outer rings 5a and 5b facing each other. Is abutted against the convex portion 27. Hereinafter, the portion of the fitting hole 25 in which the first rolling bearing 1A is fitted is referred to as “first fitting portion 29a”, and the portion in which the second rolling bearing 1B is fitted is referred to as “second fitting”. This is referred to as “joint part 29b”.

  Further, the sleeve 23 includes notches 26a and 26b in which inner peripheral edges of both end portions are chamfered over the entire circumference. The notches 26a and 26b are inclined surfaces inclined at an angle of about 45 °. The notch 26a is provided at a position facing the outer ring chamfer 6a of the first rolling bearing 1A, and the notch 26b is provided at a position facing the outer ring chamfer 6b of the second rolling bearing 1B.

  In a state where the rolling bearings 1A and 1B are fitted in the sleeve 23, an annular outer recess 36a is formed by the notch 26a and the outer ring chamfer 6a, and an annular outer recess is formed by the notch 26b and the outer ring chamfer 6b. 36b is formed. These outer recesses 36a and 36b are circumferential grooves having a substantially V-shaped cross section.

  An adhesive is applied to the outer recesses 36a and 36b so as to fill the recess, and the notch 26a and the outer ring chamfer 6a, and the notch 26b and the outer ring chamfer 6b are bonded to each other by an adhesive. Thereby, the sleeve 23 and the outer rings 5a and 5b are fixed, respectively. The outer recesses 36a and 36b are desirably of a depth that does not interfere with the rolling surfaces of the rolling elements 7 of the rolling bearings 1A and 1B on the outer rings 5a and 5b side.

Hereinafter, the manufacturing method of the rolling bearing unit 10 of this embodiment comprised in this way is demonstrated.
First, the shaft 13 is fitted to the inner ring 3a of the first rolling bearing 1A, and the end face of the inner ring 3a is abutted against the flange portion 19 (fitting step). In this state, an ultraviolet curable adhesive is applied to the inner concave portion 34a formed by the inner ring chamfered portion 4a and the inclined surface of the circumferential groove 14a so as to fill the concave portion (application step). Then, the adhesive is irradiated with ultraviolet rays by a UV irradiator (not shown) or the like, and the adhesive is rapidly cured to fix the shaft 13 and the inner ring 3a (curing step).

  Subsequently, the outer ring 5 b of the second rolling bearing 1 B is fitted to the second fitting part 29 b of the sleeve 23, and the end surface of the outer ring 5 b is abutted against the convex part 27 of the fitting hole 25. Then, the sleeve 23 is fitted together in a state where the shaft 13 fitted in the first rolling bearing 1A is fixed so that the screw hole 15 faces vertically upward (fitting step).

  Specifically, the shaft 13 is fitted to the inner ring 3b of the second rolling bearing 1B fitted in the second fitting portion 29b, and the outer ring of the first rolling bearing 1A is fitted to the first fitting portion 29a. 5a is fitted, and the end surface of the outer ring 5a is abutted against the convex portion 27. In this state, an ultraviolet curable adhesive is applied to the inner concave portion 34b formed by the inner ring chamfered portion 4b and the inclined surface of the circumferential groove 14b so as to fill the concave portion (application step).

  Then, a preload is applied to the rolling bearings 1A and 1B, and the adhesive is cured in a state where the preload is applied. Since the interval between the outer rings 5a and 5b of the rolling bearings 1A and 1B is determined by the length of the convex portion 27, it is possible to apply preload only by pressing the inner rings 3a and 3b in the direction in which they approach each other.

  Further, since the inner ring 3a of the first rolling bearing 1A is abutted against the flange portion 19, the inner ring 3b of the second rolling bearing 1B disposed on the opposite side in the axial direction with respect to the first rolling bearing 1A. Can be applied to the first rolling bearing 1A and the second rolling bearing 1B simply by pressing in the axial direction.

  Therefore, the inner ring 3b of the second rolling bearing 1B is pressed in the axial direction to apply preload to the first rolling bearing 1A and the second rolling bearing 1B (preloading step). Then, with the preload applied, the UV irradiator irradiates the adhesive in the inner recess 34b with ultraviolet rays. Thereby, the adhesive is rapidly cured, and the inner ring 3b and the shaft 13 of the second rolling bearing 1B are fixed with the preload applied (curing step).

  Thereby, the clearances between the inner rings 3a, 3b and outer rings 5a, 5b of the two rolling bearings 1A, 1B and the respective rolling elements 7 can be eliminated, and the rigidity of the rolling bearing unit 10 can be ensured and the rotation accuracy can be improved. Further, since the preload is maintained by bonding, the preload can be prevented from being lost, and the rotation accuracy of the rolling bearing unit 10 can be prevented from deteriorating.

  Subsequently, an ultraviolet curable adhesive is provided so that the outer recessed portion 36b formed by the outer ring chamfered portion 6b and the cutout portion 26b and the outer recessed portion 36a formed by the outer ring chamfered portion 6a and the cutout portion 26a are filled with the recessed portion. (Applying step), UV rays are applied to the adhesive by a UV irradiator to rapidly cure, and the outer ring 5b and the second fitting part 29b, and the outer ring 5a and the first fitting part 29a are fixed respectively. (Curing step).

  As described above, according to the rolling bearing unit 10 and the manufacturing method thereof according to the present embodiment, the inner recesses 34a and 34b and the outer recess 36b are provided at the axial ends of the rolling bearings 1A and 1B in a state of being fitted by the fitting step. Is exposed, it is easy to apply the adhesive in the application step, and there is no inconvenience that the adhesive is squeezed out during assembly. Therefore, variation in the coating amount can be prevented, and occurrence of poor curing in the curing step can be suppressed. Thereby, the rolling bearing unit 10 of stable quality can be assembled.

  Further, the adhesive interferes with the rolling surface of the rolling element 7 as in the case where the adhesive is applied to the inner peripheral surfaces of the inner rings 3a and 3b of the rolling bearings 1A and 1B and the outer peripheral surfaces of the outer rings 5a and 5b. Can be avoided. Thereby, it is possible to prevent the rolling surface from being distorted by the shrinkage of the adhesive, and to prevent torque fluctuation.

  Further, by using the ultraviolet curable adhesive, the adhesive can be rapidly cured from the outside while combining the rolling bearing unit 10, and the assembly time can be shortened. Further, unlike the thermosetting adhesive, heating is not required at the time of curing, and the occurrence of distortion of the rolling bearing unit 10 due to thermosetting can be prevented.

  In the present embodiment, the shaft 13 and the inner ring 3a are fixed when the shaft 13 is fitted to the inner ring 3a of the first rolling bearing 1A. For example, a sleeve 23 is attached to the shaft 13. It is good also as fixing the shaft 13 and the inner ring | wheel 3a after fitting. In this case, a slit for irradiating the inner concave portion 34 a with UV may be provided in the fitting hole 25 of the sleeve 23. By doing in this way, a hardening step can be implemented after combining rolling bearing unit 10 by a fitting step.

  Moreover, although the ultraviolet curable adhesive was illustrated in this embodiment, it replaces with this and, for example, it is good also as employ | adopting an anaerobic adhesive. In this case, the inner recess 34a, the inner recess 34b, the outer recess 36a, and the outer recess 36b may be left in the air for a predetermined time with an anaerobic adhesive applied. By doing in this way, the shaft 13, the sleeve 23, and the rolling bearings 1A and 1B can be fixed by a simple method.

  Further, for example, metal nano paste may be employed instead of the adhesive. In this case, the metal nano paste may be applied to the inner recess 34a, the inner recess 34b, the outer recess 36a, and the outer recess 36b and cured by heating. Since metals are bonded together, generation of outgas can be suppressed. In addition, the conductivity of the rolling bearing unit 10 can be improved, and inconvenience due to electrostatic charging can be avoided.

Further, the present embodiment can be modified as follows.
For example, in the present embodiment, the circumferential grooves 14a and 14b of the shaft 13 and the notches 26a and 26b of the sleeve each have an inclined surface, but the rolling bearing unit 110 according to the first modification is 4 to 6, the circumferential grooves 114a and 114b of the shaft 13 each have a wall surface that is cut at a substantially right angle radially inward with respect to the cylindrical surface, and the notches 126a, 126b may have a wall surface that is cut substantially perpendicularly outward in the radial direction with respect to the inner peripheral surface of the fitting hole 25.

  In the present embodiment, the chamfered portions 4a, 6a, 4b, and 6b of the rolling bearings 1A and 1B have an inclined surface of about 45 °. However, the rolling bearing unit 210 according to the second modification example is As shown in FIGS. 7 to 9, the inclined surfaces of the chamfered portions 204 a, 206 a, 204 b, and 206 b at one end of the rolling bearings 1 </ b> A and 1 </ b> B are increased in the axial direction as long as they do not interfere with the rolling surface of the rolling element 7. Also good.

  In this case, the circumferential groove 214b of the shaft 13 and the notch 226b of the sleeve 23 may be provided so as to form the inner concave portion 234b and the outer concave portion 236b facing the chamfered portions 204b and 206b, respectively. Moreover, it is good also as applying and hardening | curing an adhesive agent also to the inner side recessed part 234a and the outer side recessed part 236a. By deepening the inner recesses 234a and 234b and the outer recesses 236a and 236b in a range that does not interfere with the rolling surface of the rolling element 7, the bonding area of the adhesive is increased, thereby strengthening the bonding while preventing torque fluctuation. be able to.

It is a longitudinal cross-sectional view of the rolling bearing unit which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of the 1st recessed part of the rolling bearing unit of FIG. It is a longitudinal cross-sectional view of the 1st recessed part of the rolling bearing unit of FIG. It is a longitudinal cross-sectional view of the rolling bearing unit which concerns on the 1st modification of one Embodiment of this invention. It is a longitudinal cross-sectional view of the 1st recessed part of the rolling bearing unit of FIG. It is a longitudinal cross-sectional view of the 1st recessed part of the rolling bearing unit of FIG. It is a longitudinal cross-sectional view of the rolling bearing unit which concerns on the 2nd modification of one Embodiment of this invention. It is a longitudinal cross-sectional view of the 1st recessed part of the rolling bearing unit of FIG. It is a longitudinal cross-sectional view of the 1st recessed part of the rolling bearing unit of FIG.

Explanation of symbols

1A First rolling bearing (bearing)
2A Second rolling bearing (bearing)
10 Rolling bearing unit 13 Shaft 23 Sleeve

Claims (6)

A mating step for mating the bearing to the shaft or sleeve;
In a state where the bearing is fitted to the shaft or the sleeve by the fitting step, a chamfered portion of the bearing and a notch provided over the entire circumference at a position facing the chamfered portion of the shaft or the sleeve. An application step of applying an adhesive to the annular recess formed by:
A method for manufacturing a rolling bearing unit, comprising: a curing step for curing the adhesive. The adhesive is an anaerobic adhesive;
The method of manufacturing a rolling bearing unit according to claim 1, wherein the curing step leaves the anaerobic adhesive applied to the concave portion in the air for a predetermined time. The adhesive is an ultraviolet curable adhesive;
The method of manufacturing a rolling bearing unit according to claim 1, wherein the curing step irradiates the ultraviolet curable adhesive applied to the concave portion with ultraviolet rays for a predetermined time. The adhesive is a metal nanopaste;
The method of manufacturing a rolling bearing unit according to claim 1, wherein the curing step heats and cures the metal nanopaste applied to the recess. A preloading step for preloading the bearing after the application step;
The method of manufacturing a rolling bearing unit according to any one of claims 1 to 4, wherein the curing step is performed in a state in which the preload is applied in the preload step.   A rolling bearing unit in which an adhesive for fixing a shaft or a sleeve and a bearing is applied to a recess exposed to the outside in a state where the bearing is fitted to the shaft or the sleeve.

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