JP2009180262A - Rolling bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a cost and size without impairing rigidity and rotational accuracy. <P>SOLUTION: A rolling bearing unit 1 comprises a rolling bearing 10 for incorporating a plurality of rolling elements 16 at intervals in the peripheral direction into an annular ring-shaped space between an inner ring 12 and an outer ring 14 which are coaxially arranged, a shaft 3 adhered in a state of being fitted to the inner ring 12 of the rolling bearing 10, a sleeve 5 having a fitting hole 7 adhered in the state of fitting the outer ring 14 of the rolling bearing 10, a spacer 9 for abutting on one end in the axial direction of the inner ring 12, a holding part 21 extending inside the radial direction from an inner surface of the fitting hole 7 of the sleeve 5, and a plurality of balls 11 rollingly arranged between the spacer 9 and the holding part 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing unit.

  Generally, a rolling bearing unit rotates a cylindrical inner cylinder which is an inner member, a cylindrical outer cylinder which is an outer member disposed around the inner cylinder, and the inner cylinder and the outer cylinder relatively. And a pair of ball bearings that are freely supported. Each of the pair of ball bearings is composed of an inner ring, an outer ring, and a plurality of balls that are provided between the inner ring and the outer ring so as to be freely rollable, and is arranged at predetermined intervals in the axial direction. (For example, refer to Patent Document 1).

According to the rolling bearing unit of Patent Document 1, by inserting a ring-shaped spacer between the outer rings of the upper and lower ball bearings, the interval between the ball bearings can be maintained and the inner ring can be pressed in the axial direction. It has become. Then, with the preload applied, the pair of ball bearings are bonded with an adhesive applied to the inner surface of the outer cylinder, thereby eliminating the gap between the inner and outer rings of the two rolling bearings and the ball. The rigidity is secured and the rotation accuracy is improved.
JP 2002-257134 A

  However, since the rolling bearing unit of Patent Document 1 uses two ball bearings, there is a disadvantage that the cost is increased by the amount of the ball bearing. In addition, since the two ball bearings are arranged at intervals in the axial direction, there is a disadvantage that space is required and it is difficult to reduce the size.

  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 that can achieve cost reduction and size reduction without impairing rigidity and rotational accuracy.

In order to achieve the above object, the present invention provides the following means.
A rolling bearing containing a plurality of rolling elements with a circumferential interval in an annular space between an inner ring and an outer ring arranged on the same axis, and a state where the rolling ring is fitted to the inner ring of the rolling bearing A second member having a fitting hole that is bonded in a state in which the outer ring of the rolling bearing is fitted, a ring-shaped member that abuts one end in the axial direction of the inner ring, A rolling bearing comprising: a holding portion that extends radially inward from the inner surface of the fitting hole of the second member; and a plurality of balls that are arranged to roll between the ring-shaped member and the holding portion. Provide units.

  According to the present invention, the first member and the second member are supported so as to be relatively rotatable by the rolling bearing disposed between them. Further, the inner ring bonded to the outer surface of the first member is supported in the axial direction by a holding portion provided on the second member via a ring-shaped member and a ball.

Accordingly, when the first member and the second member are relatively rotated, the rolling element is supported between the inner and outer rings of the rolling bearing, thereby being supported in the radial direction, and the ring-shaped member and the holding portion. Is supported in the thrust direction as well. Thereby, a 1st member and a 2nd member can be rotated relatively smoothly.
In addition, since only one rolling bearing is used, the cost can be reduced and the axial bearing space can be reduced to reduce the size of the rolling bearing unit.

In the above invention, three or more balls may be arranged at a predetermined interval in the circumferential direction of the fitting hole.
According to such a configuration, one end of the inner ring of the rolling bearing can be stably supported by the plurality of balls. Therefore, the shake between the first member and the second member can be prevented, and the rotation accuracy can be easily ensured.

In the above invention, the outer ring of the rolling bearing may be bonded to the fitting hole of the second member in a state of being pressed in the axial direction toward the ring member.
According to such a configuration, pre-load is applied to the rolling bearing and the gap between the inner and outer rings and the rolling element is eliminated, so that the rigidity and rotational accuracy of the rolling bearing unit can be improved.

  According to the present invention, there is an effect that the cost can be reduced and the size can be reduced without impairing the rigidity and the rotation accuracy.

Hereinafter, a rolling bearing unit 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 rolling sleeve 10, a shaft (first member) 3 fitted to the rolling bearing 10, and a cylindrical sleeve (first sleeve) having a fitting hole 7 into which the rolling bearing 10 is fitted. 2) 5, a ring-shaped spacer (ring-shaped member) 9 disposed coaxially with the rolling bearing 10, and a ball disposed between the spacer 9 and the axial end surface of the fitting hole 7. 11. For example, four balls 11 are provided at intervals in the circumferential direction.

  The rolling bearing 10 is for rotating the shaft 3 and the sleeve 5 relatively. The rolling bearing 10 includes an inner ring 12 and an outer ring 14 that are coaxially arranged, and a plurality of rolling elements 16 that are built in an annular space between the inner ring 12 and the outer ring 14 at intervals in the circumferential direction. I have. A deep groove type or angular type inner ring raceway is provided on the outer peripheral surface of the inner ring 12, and a deep groove type or angular type outer ring raceway is provided on the inner peripheral surface of the outer ring 14.

  The shaft 3 is a substantially cylindrical member, and includes a screw hole 13 extending in the axial direction at one end and a male screw forming protrusion 15 protruding in the axial direction at the other end. The other end of the shaft 3 is provided with a flange-like flange portion 17 projecting radially outward over the entire circumference.

  The shaft 3 is fitted with a rolling bearing 10 and a spacer 9 in order from the flange portion 17 side. One end face of the inner ring 12 of the rolling bearing 10 is abutted against the flange portion 17, and the spacer 9 is abutted against the other end face of the inner ring 12. Further, the outer peripheral surface of the shaft 3 and the inner ring 12 of the rolling bearing 10 are bonded with an adhesive.

  The inner surface of the fitting hole 7 of the sleeve 5 has a stepped shape in which the inner diameter dimension gradually decreases in one direction along the axial direction, and the fitting has the same inner diameter dimension as the outer diameter dimension of the rolling bearing 10. A portion 19 and an inner flange-shaped holding portion 21 that protrudes inward in the radial direction at the end face in the axial direction are provided.

  The axial length of the fitting portion 19 is formed longer than the axial length of the rolling bearing 10. As shown in FIG. 2, the holding portion 21 is provided with four concave portions 23 that partially accommodate the balls 11. These four recesses 23 are provided at equal intervals in the circumferential direction with a predetermined interval, and each accommodates the ball 11 in a rollable manner.

  The fitting hole 7 is arranged along the axial direction in a state in which the ball 11 partially accommodated in each recess 23 from the holding portion 21 side, the spacer 9 and the inner ring 12 of the rolling bearing 10 are sequentially abutted. By the holding portion 21, the ball 11, and the spacer 9, the end surface in the axial direction of the inner ring 12 of the rolling bearing 10 is rotatably supported.

  Further, the inner peripheral surface of the fitting hole 7 and the outer ring 14 of the rolling bearing 10 are bonded with an adhesive in a state where the outer ring 14 is pressed in the axial direction toward the spacer 9. As a result, a preload is applied to the rolling bearing 10, and the inner ring 12, the outer ring 14 and the rolling element 16 are brought into contact with no gap.

Hereinafter, the manufacturing method of the rolling bearing unit 1 of this embodiment comprised in this way is demonstrated.
First, as shown in FIG. 3, an assembly 31 is assembled in which the ball 11, the spacer 9, and the rolling bearing 10 are assembled to the sleeve 5 in this order. Specifically, as shown in FIG. 4, the balls 11 are arranged to be able to roll in the respective recesses 23 of the holding portion 21 of the sleeve 5. Subsequently, as shown in FIG. 5, the spacer 9 is fitted from above, and the spacer 9 is abutted against the ball 11.

  And an adhesive agent is apply | coated to the position corresponding to the outer ring | wheel 14 of the rolling bearing 10 of the internal peripheral surface of the fitting hole 7, and the rolling bearing 10 is inserted in the fitting hole 7 as shown in FIG. The fitting part 19 is fitted.

  Next, before the outer ring 14 of the rolling bearing 10 and the inner peripheral surface of the fitting hole 7 are completely bonded, as shown in FIG. 7, a cylindrical portion having substantially the same outer diameter as that of the rolling bearing 10 is attached in the axial direction. A preload is applied to the rolling bearing 10 using a preload jig 33 at the tip. Specifically, the tip of the cylindrical portion of the preload jig 33 is brought into contact with the axial end surface of the outer ring 14 of the rolling bearing 10 and the outer ring 14 is pressed toward the spacer 9 in the axial direction.

  In this case, the inner ring 12 of the rolling bearing 10 is supported in the axial direction by the holding portion 21 provided on the sleeve 5 via the spacer 9 and the ball 11, and the length of the fitting portion 19 in the axial direction is supported. Therefore, the outer ring 14 can be shifted in the axial direction while fixing the position of the inner ring 12 in the axial direction.

  Therefore, only by pressing the outer ring 14 of the rolling bearing 10 in the axial direction, the gaps between the inner ring 12 and the outer ring 14 and the respective rolling elements 16 can be eliminated, and a preload can be applied to the rolling bearing 10. As a result, it becomes possible to apply a preload to the rolling bearing 10 by a simple method to ensure the rigidity of the rolling bearing unit 1 and to improve the rotation accuracy.

  Then, the outer ring 14 of the rolling bearing 10 and the inner peripheral surface of the fitting portion 19 are completely bonded in a state where the outer ring 14 is pressed in the axial direction by the preload jig 33. Since the preload is maintained by adhesion, it is possible to prevent the preload from being lost and to prevent the rotation accuracy of the rolling bearing unit 1 from being deteriorated. In this state, the assembly 31 is completed.

  Next, the shaft 3 is fitted to the assembly 31. Specifically, an adhesive is applied to a position corresponding to the inner ring 12 of the rolling bearing 10 on the outer peripheral surface of the shaft 3. The shaft 3 is inserted into the fitting hole 7 of the sleeve 5, and the shaft 3 is fitted to the inner ring 12 and the spacer 9 of the rolling bearing 10 fitted in the sleeve 5. Then, the inner ring 12 and the outer peripheral surface of the shaft 3 are brought into contact with the flange portion 17 of the shaft 3 with one end face of the inner ring 12 of the rolling bearing 10 abutted against the spacer 9 and the other end face of the inner ring 12 abutted against the spacer 9. Glue. Thereby, the rolling bearing unit 1 which concerns on this embodiment is manufactured.

  According to the rolling bearing unit 1 manufactured in this way, when the shaft 3 and the sleeve 5 are relatively rotated, the rolling elements 16 are rolled between the inner and outer rings of the rolling bearing 10 in the radial direction. The ball 11 is supported between the spacer 9 and the holding portion 21 and is also supported in the thrust direction. Thereby, the shaft 3 and the sleeve 5 can be smoothly rotated relatively. Also, the four balls 11 stably support one end of the inner ring 12 of the rolling bearing 10. Therefore, the shake between the shaft 3 and the sleeve 5 can be prevented, and the rotation accuracy can be easily secured.

  Even if only one rolling bearing 10 is used, one end in the axial direction of the inner ring 12 of the rolling bearing 10 can be rotatably supported to preload the rolling bearing 10, thereby ensuring rigidity and rotational accuracy. be able to. Furthermore, since the number of rolling bearings 10 is one, the cost can be reduced and the axial bearing space can be reduced to reduce the size of the rolling bearing unit 1.

In the present embodiment, the four balls 11 have been described as an example. However, it is only necessary that one end of the inner ring 12 of the rolling bearing 10 can be stably supported. For example, the number of the balls 11 is three. It is good also as making it into five or more.
Further, in the present embodiment, the balls 11 are accommodated in the recesses 23 of the holding portion 21. However, the balls 11 are spaced at regular intervals so that the balls 11 do not come into contact with each other or are not dropped from the holding portion 21 when fitted. For example, a retainer may be used to hold the ball 11 as long as the ball 11 can be arranged to be rollable.

  In the present embodiment, the spacer 9 is illustrated as being sandwiched between the inner ring 12 of the rolling bearing 10 and the ball 11, but the axial force of the inner ring 12 that rotates together with the shaft 3 is received. For example, it is good also as providing the convex part which has an abutting surface which protrudes to the shaft 3 radially outward and abuts the end surface of the inner ring 12 of the rolling bearing 10 in the axial direction. In this case, a shaft without the flange portion 17 or a shaft to which the flange portion 17 can be attached is adopted, and the shaft is fitted to the inner ring 12 of the rolling bearing 10.

It is sectional drawing which shows the outline of the whole rolling bearing unit which concerns on one Embodiment of this invention. It is the figure which looked at the sleeve of the rolling bearing unit which concerns on one Embodiment of this invention from the top. It is sectional drawing which shows a mode that a ball | bowl, a spacer, and a rolling bearing are attached to the sleeve of FIG. It is a figure which shows the state which accommodated the ball | bowl partially in the recessed part of the sleeve of FIG. It is a figure which shows the state which inserted the spacer in the sleeve of FIG. It is a figure which shows the state which fitted the rolling bearing to the sleeve of FIG. It is a figure which shows a mode that a preload is applied to the rolling bearing of FIG.

Explanation of symbols

1 Rolling bearing unit 3 Shaft (first member)
5 Sleeve (second member)
7 Fitting hole 9 Spacer (ring-shaped member)
DESCRIPTION OF SYMBOLS 10 Rolling bearing 11 Ball 12 Inner ring 14 Outer ring 16 Rolling element 21 Holding part

Claims (3)

A rolling bearing containing a plurality of rolling elements spaced circumferentially in an annular space between an inner ring and an outer ring arranged on the same axis;
A first member bonded in a state of being fitted to the inner ring of the rolling bearing;
A second member having a fitting hole bonded in a state where the outer ring of the rolling bearing is fitted;
A ring-shaped member that abuts one end of the inner ring in the axial direction;
A holding portion extending radially inward from the inner surface of the fitting hole of the second member;
A rolling bearing unit comprising a plurality of balls arranged to roll between the ring-shaped member and the holding portion.   The rolling bearing unit according to claim 1, wherein three or more balls are arranged at a predetermined interval in the circumferential direction of the fitting hole.   The rolling bearing unit according to claim 1 or 2, wherein the outer ring of the rolling bearing is bonded to the fitting hole of the second member in a state where the outer ring is pressed in the axial direction toward the ring member. .

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