JP2009191894A - Roller bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing device capable of stabilizing the behavior of a cage to suppress the skew of a roller while dispensing with caulking of the cage in assembly and preventing separation of the cage and roller from an inner ring when detaching an outer ring. <P>SOLUTION: A ball bearing 6 is disposed between a cylindrical inner peripheral surface 27 of a large diameter annular part 22 of the cage 3 located on the large diameter side of an outer peripheral conical surface which is a rolling surface of a tapered roller 4, and a cylindrical outer peripheral surface 15 of a collar part 14 located on the large diameter side of an outer peripheral conical raceway surface 12 of the inner ring 2. The outer ring 31 of the ball bearing 6 is tightly fitted to the cylindrical inner peripheral surface 27, and the inner ring 32 of the ball bearing 6 is tightly fitted to the cylindrical outer peripheral surface 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a roller bearing device including an outer ring, an inner ring, and a roller.

  Conventionally, as a roller bearing device, there is a tapered roller bearing described in Japanese Patent Laid-Open No. 2001-50281 (Patent Document 1).

  The tapered roller bearing includes an outer ring, an inner ring, a plurality of tapered rollers, and a cage. The inner ring has a large flange on the large diameter side of the conical raceway surface of the inner ring, and the small diameter side of the conical raceway surface of the inner ring. Has a gavel.

  The cage includes a small-diameter annular portion, a large-diameter large-diameter portion larger than the small-diameter annular portion, and a plurality of column portions connecting the small-diameter annular portion and the large-diameter annular portion. The small-diameter annular portion is bent inward in the radial direction, and an end portion of the small-diameter annular portion extends in a substantially radial direction. The inner surface of each of the column parts is a part of a substantially inner circumferential conical surface. The plurality of pillars are arranged at intervals in the circumferential direction of the small-diameter annular part. Between the circumferential direction of the two column parts adjacent to the said circumferential direction, it is a pocket which accommodates a tapered roller.

  The plurality of tapered rollers are arranged at intervals in the circumferential direction between the conical raceway surface of the outer ring and the conical raceway surface of the inner ring while being held by a cage.

  Conventionally, the tapered roller bearing is assembled as follows.

  First, the tapered roller is accommodated in the pocket. At this time, the end surface on the large-diameter side in the axial direction of the outer peripheral conical surface of the tapered roller is located on the large-diameter annular portion side of the pocket.

  Next, by caulking, the inner surface of the column portion is positioned outward in the radial direction by a predetermined distance from the position when the cage is used, to the extent that the tapered roller and the small collar of the inner ring do not contact when the inner ring is assembled. In this state, the inner ring is inserted inward in the radial direction of the cage, from the large-diameter annular portion side of the cage and from the small flange side in the axial direction of the inner ring, in the axial direction of the cage.

  Thereafter, the cage is crimped with a jig so that the inner surface of the pillar portion of the cage is positioned at a predetermined position when the cage is used, and the cage assembly is composed of an inner ring, a plurality of tapered rollers and a cage. Form.

  Finally, the outer ring is assembled to the cage assembly to complete the assembly of the tapered roller bearing.

  In the conventional tapered roller bearing, since the cage must be crimped twice to assemble the tapered roller bearing, the number of steps required to assemble the tapered roller bearing increases.

  Further, in the conventional tapered roller bearing, when the outer ring is removed from the cage assembly during periodic inspection of the tapered roller bearing, the cage may fall off from the inner ring and the tapered roller may come apart.

Moreover, in the conventional tapered roller bearing, there is a demand to stabilize the behavior of the cage and suppress the skew of the rolling elements.
Japanese Patent Laid-Open No. 2001-50281 (FIG. 1)

  Therefore, it is an object of the present invention to eliminate the need for caulking the cage during assembly, and when the outer ring is removed, the cage and the roller are not detached from the inner ring, and the behavior of the cage It is an object of the present invention to provide a roller bearing device that can stabilize the roller and suppress the roller skew.

In order to solve the above problems, the roller bearing device of the present invention is
An inner ring having a flange on only one side in the axial direction of the raceway surface and the raceway surface;
An outer ring having a raceway surface;
A plurality of rollers disposed between the raceway surface of the inner ring and the raceway surface of the outer ring;
A cage that holds the plurality of rollers and has an annular portion on one side of the raceway surface of the inner ring in the axial direction;
A rolling bearing disposed between the inner peripheral surface of the annular portion of the cage and the outer peripheral surface portion of the inner ring is provided.

  According to the present invention, the collar portion is present only on one side in the axial direction of the raceway surface of the inner ring, and the collar portion is not present on the other side in the axial direction of the raceway surface of the inner ring. In this case, the inner ring can be inserted into the cage assembly in which the cage and the roller are integrated, in the axial direction from the side where the flange does not exist in the inner ring without caulking the cage. Therefore, it is possible to assemble the roller bearing device much more easily than before without caulking any cage.

  Further, according to the present invention, the outer ring of the rolling bearing is fitted and fixed to the inner peripheral surface of the annular portion by an interference fit, and the inner ring of the rolling bearing is fixed to the outer peripheral surface of the inner ring. Thus, the cage can be made relatively immovable with respect to the inner ring, and the cage can be positioned with respect to the inner ring. Therefore, for example, when assembling the outer ring 1 of the tapered roller bearing device, the rollers and the cage are not detached from the inner ring and are not separated, and the outer ring can be easily assembled. Further, for example, when the outer ring is removed from the roller bearing device during the periodic inspection, the cage and the rollers are not separated from the inner ring, and the periodic inspection can be easily performed.

  Further, according to the present invention, since the cage is configured to be guided by the rolling bearing, the behavior of the cage can be stabilized and the skew of the rolling elements can be suppressed.

  According to the roller bearing device of the present invention, since the flange exists only on one side in the axial direction of the raceway surface of the inner ring and there is no flange on the other side in the axial direction of the raceway surface of the inner ring, the cage Even without caulking, the inner ring can be inserted into the cage assembly in which the cage and the roller are integrated in the axial direction from the side where the flange does not exist in the inner ring. Easy to assemble.

  According to the roller bearing device of the present invention, the outer ring of the rolling bearing is fixed to the inner peripheral surface of the annular portion by an interference fit, and the inner ring of the rolling bearing is fixed to the outer periphery of the inner ring. By externally fitting and fixing to the surface by an interference fit, the cage can be made relatively immovable with respect to the inner ring, and the cage can be positioned with respect to the inner ring. Therefore, the roller and the cage are not detached from the inner ring when the outer ring is assembled or during periodic inspection, and the outer ring can be easily assembled or periodically inspected.

  Further, according to the roller bearing device of the present invention, since the cage is configured to be guided by the rolling bearing, the behavior of the cage can be stabilized and the skew of the rolling elements can be suppressed.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction of a tapered roller bearing device according to an embodiment of the roller bearing device of the present invention.

  This tapered roller bearing device includes an outer ring 1, an inner ring 2, a cage 3, a plurality of tapered rollers 4, and a ball bearing 6 as an example of a rolling bearing.

  The outer ring 1 has an inner circumferential conical raceway surface 11 as a raceway surface.

  On the other hand, the inner ring 2 has an outer circumferential conical raceway surface 12 as a raceway surface. The inner ring 2 has a flange portion 14 only on the large diameter side of the outer circumferential conical raceway surface 12 that is one side in the axial direction. The outer peripheral surface 15 of the collar part 14 has a cylindrical shape.

  The cage 3 includes a small-diameter annular portion 21, a large-diameter annular portion 22, and a plurality of pillar portions (not shown). The maximum inner diameter of the small-diameter annular portion 21 is smaller than the minimum inner diameter of the large-diameter annular portion 22. The small-diameter annular portion 21 bends inward in the substantially radial direction from a direction substantially parallel to the outer circumferential conical raceway surface 12 of the inner ring 2 as it goes outward in the axial direction, so that the small-diameter annular portion 21 extends outward in the axial direction. The one end extends in a substantially radial direction.

  On the other hand, the large-diameter annular portion 22 bends in a substantially axial direction from a direction substantially parallel to the outer peripheral conical raceway surface 12 of the inner ring 2 as it goes outward in the axial direction, and the axial direction of the large-diameter annular portion 22 increases. The outer end extends substantially in the axial direction. As shown in FIG. 1, the end portion of the large-diameter annular portion 22 has a substantially cylindrical shape, and the end portion has a cylindrical outer peripheral surface and a cylindrical inner peripheral surface 27.

  Each of the column portions connects the end surface of the small diameter annular portion 21 on the large diameter annular portion 22 side in the axial direction and the end surface of the large diameter annular portion 22 on the small diameter annular portion 21 side in the axial direction. Each of the column portions extends substantially linearly in the axial cross section. The plurality of column portions are arranged at substantially equal intervals in the circumferential direction of the small-diameter annular portion 21.

  Each of the tapered rollers 4 is accommodated in a pocket 24 that is an area surrounded by the two column portions adjacent to each other in the circumferential direction, the small-diameter annular portion 21, and the large-diameter annular portion 22. The small-diameter annular portion 21 is located on the small-diameter side of the outer peripheral conical surface that is the rolling surface of the tapered roller 4, while the large-diameter annular portion 22 is the large-diameter side of the outer-circular conical surface that is the rolling surface of the tapered roller 4. Is located. The plurality of tapered rollers 4 are spaced apart from each other in the circumferential direction while being held by the cage 3 between the inner circumferential conical raceway surface 11 of the outer ring 1 and the outer circumferential conical raceway surface 12 of the inner ring 2. Has been placed.

  The ball bearing 6 is disposed between the cylindrical outer peripheral surface 15 of the flange portion 14 of the inner ring 2 and the cylindrical inner peripheral surface 27 of the end portion of the large-diameter annular portion 22. The ball bearing 6 includes an outer ring 31, an inner ring 32, and a plurality of balls 33. The outer ring 31 is fitted into the cylindrical inner peripheral surface 27 of the large-diameter annular portion 22 by press-fitting and is tightly fitted. The inner ring 32 is fitted on the cylindrical outer peripheral surface 15 of the flange 14 by press-fitting and is tightly fitted. The plurality of balls 33 are arranged at intervals in the circumferential direction while being held by a cage (not shown) between the raceway groove of the outer ring 31 and the raceway groove of the inner ring 32. ing.

  For example, the tapered roller bearing device is assembled as follows.

  First, the tapered rollers 4 are arranged in the pockets 24 of the cage 3. Next, the pre-assembled ball bearing 6 is fitted into the inner peripheral cylindrical surface 27 of the large-diameter annular portion 22 of the retainer 3 by press-fitting and is tightly fitted.

  Next, the inner ring 2 is pressed in the axial direction from the large-diameter annular portion 22 side of the cage 3 and the small-diameter side of the outer peripheral conical raceway surface 12 of the inner ring 2 and assembled to the tapered roller 4, the cage 3 and the ball bearing 6. .

  Finally, the outer ring 1 is inserted in the axial direction from the small-diameter annular portion 21 side of the retainer 3 and the large-diameter side of the inner peripheral conical raceway surface 11 of the outer ring 1, and the outer ring 1 is inserted into the tapered roller 4 and the retainer 3. Assemble and complete the assembly of the tapered roller bearing device.

  Also, for example, the tapered roller bearing device can be assembled as follows.

  First, the tapered rollers 4 are arranged in the pockets 24 of the cage 3. Next, the inner ring 2 is inserted in the axial direction from the large-diameter annular portion 22 side of the cage 3 and the small-diameter side of the outer peripheral conical raceway surface 12 of the inner ring 2 and assembled to the tapered roller and the cage 3.

  Next, the pre-assembled ball bearing 6 is placed between the inner peripheral cylindrical surface 27 of the large-diameter annular portion 22 of the cage 3 and the cylindrical outer peripheral surface 15 of the flange portion 14 of the inner ring 2 in the axial direction. The ball bearing 6 is assembled between the cage 3 and the inner ring 2 by press-fitting from the outside to the inside in the axial direction to a predetermined position.

  Finally, the outer ring 1 is inserted in the axial direction from the small-diameter annular portion 21 side of the retainer 3 and the large-diameter side of the inner peripheral conical raceway surface 11 of the outer ring 1, and the outer ring 1 is inserted into the tapered roller 4 and the retainer 3. Assemble and complete the assembly of the tapered roller bearing device.

  According to the tapered roller bearing device of the above embodiment, the flange portion 14 exists only on the large-diameter side in the axial direction of the outer peripheral conical raceway surface 12 of the inner ring 2, and the other axial direction of the outer peripheral conical raceway surface 12 of the inner ring 2 is present. Since there is no flange on the side, the inner ring 2 can be connected to the cage 3 in the cage assembly in which the cage 3 and the rollers are integrated without the cage 3 being caulked when the tapered roller bearing device is assembled. It can be inserted in the axial direction from the large-diameter annular portion 22 side and from the side where the flange portion does not exist in the inner ring 2, that is, from the small-diameter side of the outer peripheral conical raceway surface 12 of the inner ring 2. Therefore, it is possible to assemble the roller bearing device much more easily than before without caulking any cage.

  Further, according to the tapered roller bearing device of the above embodiment, a ball is interposed between the inner peripheral cylindrical surface 27 of the large-diameter annular portion 22 of the cage 3 and the cylindrical outer peripheral surface 15 of the flange portion 14 of the inner ring 3. Since the bearing 6 is fixed with a tightening margin, the cage 3 hardly moves relative to the inner ring 2. Therefore, for example, at the time of assembling the outer ring 1 of the tapered roller bearing device, the tapered roller 4 and the cage 3 do not fall off from the inner ring 2 and do not come apart, and the outer ring 1 can be easily assembled. it can. In addition, when the outer ring 1 is removed from the tapered roller receiving device during the periodic inspection, the cage 3 and the tapered roller 4 do not fall off from the inner ring 2 and do not come apart, making periodic inspection easier and more efficient. Can be done automatically.

  Further, according to the tapered roller bearing device of the above embodiment, since the cage 3 is guided by the ball bearing 6, the behavior of the cage 3 can be stabilized, and the skew of the tapered roller 4 can be reduced. Can be suppressed.

  In the tapered roller bearing device of the above embodiment, the cage is provided between the inner circumferential cylindrical surface 27 of the large-diameter annular portion 22 of the cage 3 and the cylindrical outer circumferential surface 15 of the flange portion 14 of the inner ring 2. The ball bearing 6 which has is arrange | positioned. Here, examples of the cage that can be used in the ball bearing 6 include a cage in which two annular members are connected by a plurality of column portions, and a so-called crown type cage.

  In the tapered roller bearing device of the above embodiment, the cage is provided between the inner circumferential cylindrical surface 27 of the large-diameter annular portion 22 of the cage 3 and the cylindrical outer circumferential surface 15 of the flange portion 14 of the inner ring 2. Although the ball bearing 6 is disposed, in the present invention, the entire ball bearing having no cage is provided between the inner circumferential cylindrical surface of the large-diameter annular portion of the cage and the cylindrical outer circumferential surface of the flange portion of the inner ring. May be arranged. Further, in this invention, even if a ball bearing having a deep groove type raceway groove is disposed between the inner peripheral cylindrical surface of the large-diameter annular portion of the cage and the cylindrical outer peripheral surface of the flange portion of the inner ring, A ball bearing having an angular type raceway groove may be arranged.

  Further, in the tapered roller bearing device of the above embodiment, the ball bearing 6 is disposed between the cage 3 and the inner ring 2. However, in the present invention, a roller bearing and a needle bearing are disposed between the cage and the inner ring. Any rolling bearing other than a ball bearing may be arranged. If a non-separable type rolling bearing such as a ball bearing or a self-aligning roller bearing is arranged between the cage and the inner ring, there is no need to worry about separation of the rolling bearing arranged between the cage and the inner ring. Good and preferable.

  In the tapered roller bearing device of the above embodiment, in the cage 3, the outer periphery of the large-diameter annular portion 22 of the cage 3 positioned on the large-diameter side of the conical raceway surface 11 of the outer ring 1 and the flange portion 14 of the inner ring 2. A rolling bearing was arranged between the surface 15. However, in the present invention, a cylindrical outer peripheral surface is formed on the side where the flange portion does not exist, that is, on the small diameter side of the conical raceway surface of the inner ring, and the cage is positioned on the small diameter side of the conical raceway surface of the inner ring in the axial direction. A rolling bearing may be arranged between the radially inner end surface of the small-diameter annular portion of the cage and the cylindrical outer peripheral surface of the inner ring located on the small-diameter side of the conical raceway surface of the inner ring.

  Moreover, in the tapered roller bearing of the said embodiment, the end surface of the axial direction both sides of the inner ring | wheel 32 of the ball bearing 6 was not contact | abutting with the other member. However, in the present invention, the outer diameter of the outer peripheral surface portion (hereinafter referred to as the first portion) of the inner ring on which the rolling bearing is arranged is set to the outer peripheral surface portion (on the roller side in the axial direction of the outer peripheral surface portion ( Hereinafter, the inner diameter of the rolling bearing may be brought into contact with the end face in the axial direction connecting the first part and the second part. This is preferable because the rolling bearing can be positioned in the axial direction.

  Moreover, in the said embodiment, although the rolling element was the tapered roller 4, in this invention, rollers other than tapered rollers, such as a cylindrical roller and a spherical roller (convex roller), may be sufficient.

It is a schematic cross section of the axial direction of the tapered roller bearing apparatus of one Embodiment of the roller bearing apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Cage 4 Tapered roller 6 Ball bearing 11 Inner circumferential conical raceway surface 12 Outer circumference conical raceway surface 14 Ridge portion 15 Cylindrical outer circumference surface 22 Large diameter annular portion 27 Large diameter annular portion cylindrical inner circumference surface

Claims (1)

An inner ring having a flange on only one side of the raceway surface and the axial direction of the raceway surface;
An outer ring having a raceway surface;
A plurality of rollers disposed between the raceway surface of the inner ring and the raceway surface of the outer ring;
A cage that holds the plurality of rollers and has an annular portion on one side of the raceway surface of the inner ring in the axial direction;
A roller bearing device comprising: a rolling bearing disposed between an inner peripheral surface of the annular portion of the cage and a portion of an outer peripheral surface of the inner ring.

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