JP5026301B2 - Rolling bearing unit and manufacturing method thereof - Google Patents

Description

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

  As a bearing device used for a rotating device, a bearing device including two or more bearings including an inner ring fitted with a shaft, an outer ring fitted in a housing, and a rolling element disposed between the inner ring and the outer ring. It has been known. Normally, the inner ring and shaft of each bearing and the outer ring and housing of each bearing of such a bearing device are fixed by press-fitting, press-fitting with an adhesive, or clearance fit with an adhesive, respectively. (For example, refer to Patent Document 1). The clearance fit is a fit in which the maximum allowable dimension of the shaft is smaller than the minimum allowable dimension of the hole, and there is always a gap between the hole and the shaft.

In the bearing device of Patent Document 1, the shaft and the inner ring of the bearing are attached by a clearance fit, the outer ring of the bearing and the housing are attached by a clearance fit, and the respective tolerances are set within a predetermined range. The generation of precession during rotation is suppressed.
JP 2002-130265 A

  However, when the fitting portion of the shaft and the inner ring of the bearing and the fitting portion of the outer ring of the bearing and the housing are respectively fixed by clearance fit, as in the bearing device of Patent Document 1, the clearance of the fitting portion is large. Has a disadvantage that it causes misalignment and causes disturbance in torque. If these fitting parts are fixed by press-fitting, the adhesive applied to the fitting part is scraped off at the time of fitting, or the bearing is loaded and the inner ring is deformed. There is an inconvenience that noise may be adversely affected.

  The present invention has been made in view of the above-described circumstances, and provides a rolling bearing unit capable of reducing the load applied to the rolling bearing during fitting and minimizing misalignment, and a method for manufacturing the same. For the purpose.

In order to achieve the above object, the present invention provides the following means.
In the present invention, a plurality of rolling elements are incorporated in an annular space between an inner ring and an outer ring that are coaxially arranged with a circumferential interval therebetween, and are arranged with a predetermined interval in the axial direction. Two rolling bearings, a first member to be bonded in a state of being fitted to the inner ring of the two rolling bearings, and a fitting hole to be bonded in a state of being fitted to the outer ring of the two rolling bearings And at least one of the fitting portion between the inner ring and the first member of the two rolling bearings or the fitting portion between the outer ring and the fitting hole is an intermediate fit. A rolling bearing unit assembled by the above is provided.

  According to the present invention, the rolling bearing unit is configured by fitting the outer rings of the two rolling bearings assembled to the first member into the fitting holes of the second member. In this case, at least one of the fitting portion between the inner ring and the first member of the two rolling bearings or the fitting portion between the outer ring and the fitting hole of the two rolling bearings is caused by an intermediate fit. Since the size of the gap (that is, play) is limited, the coaxiality can be secured and misalignment can be suppressed as compared with the case where there is always play by making all the fitting portions fit. In addition, compared to the case where these fitting parts are assembled by press fitting, the load applied to the rolling bearing during fitting can be reduced, and the inner ring can be prevented from being deformed and the rolling elements from being damaged. it can.

  In the above invention, the first member includes a flange portion protruding radially outward at one end in the axial direction over the entire circumference and abutting the end surface of the inner ring of one of the rolling bearings, on the side far from the flange portion It is good also as the fitting part of the said outer ring | wheel and the said fitting hole of the other said rolling bearing arrange | positioned in being assembled | attached by the intermediate fit.

  According to such a configuration, the inner ring of the other rolling bearing arranged on the opposite side of the axial direction with respect to the one rolling bearing in which the end surface of the inner ring is abutted against the flange portion of the first member is axially moved. Pre-loading can be applied to the two rolling bearings simply by pressing. Also, at least one of the fitting portions can be an intermediate fit without hindering the flange of the first member.

  In the present invention, the outer ring is bonded to the inner ring of the first rolling bearing having a plurality of rolling elements in the annular space between the inner ring and the outer ring arranged on the same axis and spaced apart in the circumferential direction. A plurality of rolling elements are built in the annular space between the inner ring and the outer ring arranged on the same axis and spaced in the circumferential direction. The outer ring of the second rolling bearing is fitted and bonded to the fitting hole of the second member coated with an adhesive at the position of the inner peripheral surface corresponding to the second rolling bearing. And an adhesive agent at a position corresponding to the second rolling bearing on the outer peripheral surface in the fitting hole of the second member coated with an adhesive at a position corresponding to the first rolling bearing on the inner peripheral surface. Insert the coated first member, the outer ring of the first rolling bearing and the inner peripheral surface of the fitting hole, And, to provide a method of manufacturing a rolling bearing unit and a step of bonding the outer peripheral surface of said the inner ring of the second rolling bearing first member respectively fitted by clearance fit.

  According to the present invention, a rolling bearing unit is configured by fitting the first member assembled with the first rolling bearing into the fitting hole of the second member assembled with the second rolling bearing. . In this case, since the second rolling bearing is assembled to the second member by an intermediate fit, play of the fitting portion between the outer ring and the fitting hole of the second rolling bearing can be effectively limited.

  Specifically, the coaxiality can be easily ensured as compared with the case where there is always play by making all fitting portions into a clearance fit. Moreover, compared with the case where a fitting part is assembled | attached by press injection, the space which apply | coats an adhesive agent at the time of a fitting can be ensured, or the load concerning a rolling bearing can be reduced. Accordingly, it is possible to assemble the rolling bearing unit while suppressing misalignment and without scraping off the adhesive or deforming the rolling bearing during fitting.

  In the above invention, the first member includes a flange portion that protrudes radially outward at one end in the axial direction over the entire circumference and abuts the end surface of the inner ring of the first rolling bearing, and the inner ring is provided in the flange portion. The inner rings of the second rolling bearings, which are arranged on the opposite side of the axial direction with respect to the first rolling bearings against which the end surfaces of the two rolling bearings are pressed, are axially pressed to bring the inner rings of the two rolling bearings close to each other. It is good also as providing the step which adhere | attaches these inner rings and said 1st member in the state which applied the preload to the direction to make.

  According to such a configuration, it is possible to apply preload to the two rolling bearings simply by pressing the inner ring of the second rolling bearing in the axial direction. Further, at least one of the fitting portions can be an intermediate fit without hindering the collar portion of the first member.

  According to the present invention, it is possible to reduce the load applied to the rolling bearing during fitting and to minimize the misalignment.

Hereinafter, a rolling bearing unit and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rolling bearing unit 1 according to the present embodiment is a rolling bearing unit for a swing arm, for example. This rolling bearing unit 1 includes a first rolling bearing 10A and a second rolling bearing 10B (hereinafter referred to as a first rolling bearing 10A and a second rolling bearing 10B) that are arranged at predetermined intervals in the axial direction. (Referred to as “rolling bearings 10A and 10B”), a shaft (first member) 3 fitted to these rolling bearings 10A and 10B, and a fitting hole 7 for fitting the rolling bearings 10A and 10B. And a cylindrical sleeve (second member) 5.

  The rolling bearings 10A and 10B are for rotating the shaft 3 and the sleeve 5 relatively. The first rolling bearing 10A includes an inner ring 12a and an outer ring 14a that are coaxially arranged, and a plurality of rolling elements that are built in an annular space between the inner ring 12a and the outer ring 14a with a circumferential interval therebetween. 16.

A deep groove type or angular type inner ring raceway is provided on the outer peripheral surface of the inner ring 12a of the first rolling bearing 10A, and a deep groove type or angular type outer ring raceway is provided on the inner peripheral surface of the outer ring 14a. Yes.
Note that the second rolling bearing 10B has the same configuration as the first rolling bearing 10A, and a description thereof will be omitted.

  The shaft 3 is a substantially cylindrical member, and includes a screw hole 9 extending in the axial direction at one end and a projection 11 for forming an external thread protruding in the axial direction at the other end. The other end of the shaft 3 is provided with a flange-like flange portion (ridge portion) 13 that protrudes radially outward over the entire circumference.

  A first rolling bearing 10A and a second rolling bearing 10B are fitted into the shaft 3 in order from the flange portion 13 side. Further, the outer peripheral surface of the shaft 3 and the inner rings 12a and 12b of the rolling bearings 10A and 10B are bonded with an adhesive. The shaft 3 has a dimensional difference between the outer diameter of the shaft 3 and the inner diameter of the inner rings 12a and 12b of the rolling bearings 10A and 10B in the range of +0.002 mm to +0.025 mm. 12b is assembled by clearance fit.

  On the inner surface of the fitting hole 7 of the sleeve 5, a convex portion 15 that protrudes inward is provided at the approximate center in the axial direction. The fitting hole 7 is fitted with a first rolling bearing 10A on one side in the axial direction and a second rolling bearing 10B on the other side with the convex portion 15 in between, and end faces of the outer rings 14a and 14b facing each other. Is abutted against the convex portion 15. Hereinafter, the portion of the fitting hole 7 in which the first rolling bearing 10A is fitted is referred to as “first fitting portion 17”, and the portion in which the second rolling bearing is fitted is referred to as “second fitting”. Part 19 ".

  The inner peripheral surface of the fitting hole 7 and the outer rings 14a and 14b of the rolling bearings 10A and 10B are bonded to each other with an adhesive in a state in which the inner rings 12a and 12b are pressed in directions close to each other. As a result, the rolling bearings 10A and 10B are preloaded, and the inner rings 12a and 12b and the outer rings 14a and 14b and the rolling elements 16 are brought into contact with no gap.

  This sleeve 5 has a dimensional difference between the inner diameter of the first fitting portion 17 and the outer diameter of the outer ring 14a of the first rolling bearing 10A in the range of +0.002 mm to +0.020 mm. The outer ring 14a is assembled by a clearance fit. Further, the sleeve 5 is used in which the dimensional difference between the inner diameter of the second fitting portion 19 and the outer diameter of the outer ring 14b of the second rolling bearing 10B is in the range of -0.004 mm to +0.015 mm. The outer ring 14b is assembled by an intermediate fit.

Hereinafter, the manufacturing method of the rolling bearing unit 1 of this embodiment comprised in this way is demonstrated.
First, an adhesive is applied to the inner peripheral surface of the second fitting portion 19 of the sleeve 5, and the outer ring 14b of the second rolling bearing 10B is fitted. Then, as shown in FIG. 2, the outer peripheral surface of the outer ring 14b and the second fitting portion 19 are in contact with the end face of the outer ring 14b of the second rolling bearing 10B against the convex portion 15 of the fitting hole 9. And glue. In this case, since the fitting portion between the second rolling bearing 10B and the second fitting portion 19 is an intermediate fit, play of the fitting portion can be limited.

  Next, an adhesive is applied to a position corresponding to the inner ring 12a of the first rolling bearing 10A on the outer peripheral surface of the shaft 3. Then, the shaft 3 is fitted to the inner ring 12a of the first rolling bearing 10A, and the end surface of the inner ring 12a is abutted against the flange portion 13 as shown in FIG.

  In this case, since the fitting portion between the first rolling bearing 10A and the shaft 3 is a clearance fit, there is always play in the fitting portion. Therefore, the adhesive applied to the shaft 3 can be prevented from being scraped out by the inner ring 12a, and the load applied to the inner ring 12a having a small diameter and easily deformed can be reduced.

  Subsequently, an adhesive is applied to the inner peripheral surface of the first fitting portion 17 of the sleeve 5. Further, an adhesive is applied to a position corresponding to the inner ring 12b of the second rolling bearing 10B on the outer peripheral surface of the shaft 3. Then, as shown in FIG. 4, the sleeve 5 is fitted in a state where the shaft 3 fitted in the first rolling bearing 10 </ b> A is fixed so that the screw hole 9 is vertically upward.

  Specifically, the shaft 3 is fitted to the inner ring 12b of the second rolling bearing 10B fitted in the second fitting portion 19, and the first rolling bearing 10A is fitted to the first fitting portion 17. The outer ring 14 a is fitted, and the end surface of the outer ring 14 a is abutted against the convex portion 15.

  In this case, the fitting portion between the first rolling bearing 10A and the shaft 3, the fitting portion between the second rolling bearing 10B and the shaft 3 assembled by clearance fitting, and the first rolling bearing 10A and the first Since there is always play in the fitting portion with the fitting portion 17, following the fitting portion between the second rolling bearing 10 </ b> B and the second fitting portion 19 where play is limited by the intermediate fit. The axial center position is adjusted while being adjusted in the radial direction.

  Therefore, it is easy to ensure the coaxiality, and misalignment can be suppressed. In addition, the adhesive applied to the fitting portion between the second rolling bearing 10B and the shaft 3 and the fitting portion between the first rolling bearing 10A and the first fitting portion 17 is prevented from being scraped off. Further, it is possible to reduce the load applied to the rolling bearings 10A and 10B, particularly the inner ring 12b having a small diameter and being easily deformed.

  Subsequently, before the fitting portion between the second rolling bearing 10B and the shaft 3 and the fitting portion between the first rolling bearing 10A and the first fitting portion 17 are completely bonded, the rolling bearing. Preload is applied to 10A and 10B. In this case, since the interval between the outer rings 14a and 14b of the rolling bearings 10A and 10B is determined by the length of the convex portion 15, it is possible to apply preload only by pressing the inner rings 12a and 12b in the direction in which they are brought close to each other. it can.

  Further, since the inner ring 12a of the first rolling bearing 10A is abutted against the flange portion 13, the inner ring 12b of the second rolling bearing 10B disposed on the opposite side in the axial direction with respect to the first rolling bearing 10A. It is possible to apply preload to the first rolling bearing 10A and the second rolling bearing 10B simply by pressing in the axial direction.

  Therefore, the inner ring 12b of the second rolling bearing 10B and the shaft are pressed in a state where the inner ring 12b of the second rolling bearing 10B is pressed in the axial direction and preload is applied to the first rolling bearing 10A and the second rolling bearing 10B. 3 and the outer ring 14a of the first rolling bearing 10A and the inner peripheral surface of the first fitting portion 17 are completely bonded to each other.

  Thereby, the clearances between the inner rings 12a and 12b and the outer rings 14a and 14b of the two rolling bearings 10A and 10B and the respective rolling elements 16 are eliminated by a simple method, thereby ensuring the rigidity of the rolling bearing unit 1 and improving the rotation accuracy. Can do. Moreover, since it maintains in the state which applied the preload by adhesion | attachment, preload loss can be prevented and the deterioration of the rotation precision of the rolling bearing unit 1 can be prevented.

  As described above, according to the rolling bearing unit 1 and the manufacturing method thereof according to the present embodiment, the fitting portion between the second rolling bearing 10 </ b> B disposed on the side far from the flange portion 13 and the second fitting portion 19 is intermediate. Since it is a fit and other places are clearance fits, at least one of the fitting parts can be an intermediate fit without hindering the flange 13. Thereby, the load concerning rolling bearing 10A, 10B at the time of a fitting can be reduced, and misalignment can be suppressed to the minimum.

  In the present embodiment, the fitting portion between the second rolling bearing 10B and the second fitting portion 19 is illustrated as an intermediate fit. However, instead of this, The fitting portion between the rolling bearing 10B and the shaft 3, the fitting portion between the first rolling bearing 10A and the first fitting portion 17, or the fitting portion between the first rolling bearing 10A and the shaft 3 is intermediate. It may be a fit. Further, two or more of the fitting portions may be intermediate fits.

It is the schematic which shows the rolling bearing unit which concerns on one Embodiment of this invention. It is a figure which shows the cross section of the state in which the 2nd rolling bearing unit was engage | inserted by the sleeve. It is a figure which shows the cross section of the state which fitted the shaft to the 1st rolling bearing. It is a figure which shows a mode that the 1st rolling bearing with which the shaft was fitted is fitted to a sleeve.

Explanation of symbols

1 Rolling bearing unit 3 Shaft (first member)
5 Sleeve (second member)
7 Fitting hole 10A 1st rolling bearing 10B 2nd rolling bearing 12a, 12b Inner ring 14a, 14b Outer ring 16 Rolling element

Claims (3)

A first rolling bearing in which a plurality of rolling elements are built in an annular space between an inner ring and an outer ring arranged on the same axis and spaced apart in the circumferential direction, and arranged at predetermined intervals in the axial direction. And a second rolling bearing,
A first flange that protrudes radially outward at one end in the axial direction and abuts against the end face of the inner ring of the first rolling bearing is bonded to the inner ring of the two rolling bearings. Members,
A second member having a fitting hole to be bonded in a state where the outer ring of the two rolling bearings is fitted.
Between the inner ring and the first member of the first rolling bearing, between the outer ring of the first rolling bearing and the fitting hole of the second member, and the second rolling. A rolling bearing unit in which a clearance fit is provided between the inner ring and the first member of the bearing, and an intermediate fit is provided between the outer ring and the fitting hole of the second rolling bearing. . The inner ring of the first rolling bearing, which includes a plurality of rolling elements spaced circumferentially in an annular space between the inner ring and the outer ring arranged on the same axis, is radially outward at one end in the axial direction. Fitting a first member having a flange portion protruding in the direction and abutting against an end face of the inner ring of the first rolling bearing with an adhesive applied to the outer peripheral surface by a clearance fit;
In a fitting hole located on the side farther from the flange portion of the second member where the adhesive is applied to the position of the inner peripheral surface, in the annular space between the inner ring and the outer ring arranged coaxially in the circumferential direction Fitting and bonding the outer ring of the second rolling bearing containing a plurality of rolling elements at intervals by an intermediate fit;
A first member in which an adhesive is applied at a position corresponding to the second rolling bearing on the outer peripheral surface in a fitting hole of a second member applied with an adhesive at a position on the side closer to the flange portion of the inner peripheral surface; By inserting a member, the outer ring of the first rolling bearing and the inner peripheral surface of the fitting hole, and the inner ring of the second rolling bearing and the outer peripheral surface of the first member are respectively fitted by clearance fit. Mating and adhering; and
A method of manufacturing a rolling bearing unit comprising: The first member axially presses the inner ring of the second rolling bearing disposed on the opposite side to the first rolling bearing with the end face of the inner ring abutting against the flange. The bearing unit manufacturing method according to claim 2, further comprising a step of bonding the inner ring and the first member in a state where a preload is applied in a direction in which the inner rings of the two rolling bearings are close to each other .

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