JP2007198432A - Cage for thrust bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To preclude a roller of a rolling element from being separated (coming off) easily out of a cage to enhance assemblability and disassemblability. <P>SOLUTION: The roller 4 of the rolling element is prevented from coming off easily out of the cage 5. The cage 5 and the roller 4 of the rolling element are precluded from being separated to enhance the assemblability and the disassemblability. A shape of a pocket 7 is formed into an R-shape (circular arc shape), and a punching margin part (boundary part 10a between a roller insertion part 10 and a roller guide part 8) is provided in the pocket 7 to insert the roller 4 of the rolling element from the punching margin part 10a. That is, the pocket 7 of the cage 5 has the roller guide face 8 opposed to the roller 4, and the roller guide face 8 holds the roller 4 inserted into the pocket 7, and is formed into a shape to prevent the roller 4 from coming off carelessly out of the pocket 7, by the punching margin part 10a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thrust bearing retainer used in, for example, a steel rolling mill.

  For example, a thrust bearing retainer (flat bearing retainer) used in a steel rolling mill has a structure having a large number of pockets on a flat plate, as shown in FIG.

  That is, as shown in FIG. 5 (a), the flat bearing is composed of a pair of washer plates (not shown) stacked on each other, and a roller 4 (see FIG. 5) that is a large number of rolling elements interposed between the washer plates. 6) and a plate-like cage 5 provided with a large number of pockets 7 for accommodating the respective rollers 4.

  In this flat bearing, each washer is relatively rotated about a rotation axis parallel to the stacking direction of each washer.

  The cage 5 has a substantially circular plane in which a rotation direction outer end surface is a convex arc surface 5a along a concentric circle with respect to the rotation axis, and a rotation direction inner end surface is a concave arc surface 5b along a concentric circle with respect to the rotation axis. It has a fan shape.

  In such a flat bearing, the convex arcuate surface 5a and the concave arcuate surface 5b of the cage 5 are slidably brought into sliding contact with the outer flange (not shown) and the turning guide pin (not shown), respectively. Each washer is relatively thrust-rotated. In addition, the use of this flat bearing is mainly one that repeatedly rotates at a small angle.

  In the pocket 7 of the cage 5, as shown in FIG. 5B or FIG. 6, the shape of the roller guide surface 8 is straight (flat). The width dimension is (α) as shown in FIG.

  The rolling element roller 4 is assembled by first placing the cage 5 on the lower washer and placing the rolling element roller 4 in the pocket 7 from above. The roller 4 of the rolling element is simply arranged equally.

  FIG. 5A is a plan view of an integral type thrust bearing cage (flat bearing cage) according to a conventional example, and FIG. 5B is an enlarged view of the pocket.

FIG. 6 is a partial cross-sectional view of an integral type thrust bearing cage (flat bearing cage) according to the conventional example shown in FIGS. 5 (a) and 5 (b).
Japanese Patent Application No. 2004-346751

  However, in the integrated type thrust bearing retainer according to the conventional example shown in FIGS. 5 and 6, the roller 4 of the rolling element easily comes out of the pocket 7 of the retainer 5 when assembled, and thus the work is not performed. It was very complicated.

  The present invention has been made in view of the circumstances as described above, and it is possible to improve the assemblability so that the cage and the roller of the rolling element are not easily separated (not detached). An object of the present invention is to provide a cage for a thrust bearing.

In order to achieve the above object, a thrust bearing retainer according to the present invention is mounted on a thrust bearing in which a roller of a rolling element is interposed between a pair of raceways arranged in a stacked manner. In a thrust bearing cage in which the rollers of the rolling elements are evenly distributed,
A snapping margin is provided in the pocket of the cage.

Preferably, the cage pocket has a roller guide surface facing the roller,
The roller guide surface is formed in a shape that holds the rollers inserted into the pockets and prevents the rollers from accidentally coming out of the pockets.

Preferably, the roller guide surface is
The end on one side is a protruding edge that prevents the roller from dropping out of the pocket,
The other end has a roller insertion portion formed at a distance slightly smaller than the diameter of the outer diameter of the roller.

  Further preferably, the roller guide surface is formed in a substantially arc shape between the protruding edge portion and the roller insertion portion.

  According to the present invention, the retainer and the roller of the rolling element are not easily separated (cannot be detached), so that the assembling property can be improved. Scattering can be prevented.

  Hereinafter, a thrust bearing retainer according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1A is a plan view of an integral type thrust bearing retainer (flat bearing retainer) according to the first embodiment of the present invention, and FIG. 1B is an enlarged view of its pocket. .

  FIG. 2A is a plan view of a split-type thrust bearing retainer (flat bearing retainer) according to a modification of the first embodiment of the present invention, and FIG. FIG.

  FIG. 3 is a partial cross-sectional view of the integral type thrust bearing cage (flat bearing cage) shown in FIGS. 1 (a), 1 (b) and 2 (a), 2 (b).

  As shown in FIGS. 1 (a) and 2 (a), the flat bearing is a pair of washer plates (not shown) stacked on each other and a large number of rolling elements interposed between the washer plates. A roller 4 (FIG. 3) and a plate-like cage 5 provided with a large number of pockets 7 for storing the rollers 4 are provided.

  In this flat bearing, each washer is relatively rotated about a rotation axis parallel to the stacking direction of each washer.

  The cage 5 has a substantially circular plane in which a rotation direction outer end surface is a convex arc surface 5a along a concentric circle with respect to the rotation axis, and a rotation direction inner end surface is a concave arc surface 5b along a concentric circle with respect to the rotation axis. It has a fan shape.

  In such a flat bearing, the convex arcuate surface 5a and the concave arcuate surface 5b of the cage 5 are slidably brought into sliding contact with the outer flange (not shown) and the turning guide pin (not shown), respectively. Each washer is relatively thrust-rotated. In addition, the use of this flat bearing is mainly one that repeatedly rotates at a small angle.

  Now, the present embodiment is characterized in that the rolling element roller 4 is not easily detached from the cage 5. The cage 5 and the roller 4 of the rolling element are not broken, and the assembling property can be improved. As shown in FIG. 3, the shape of the roller guide surface 8 of the pocket 7 is changed to an R shape (arc shape), and the pocket 7 is provided with a snapping portion (a boundary portion 10 a between the roller insertion portion 10 and the roller guide surface 8). The roller 4 of the rolling element is inserted from the pinch margin (the boundary portion 10a between the roller insertion portion 10 and the roller guide surface 8).

  That is, the pocket 7 of the cage 5 has a roller guide surface 8 that faces the roller 4, and the roller guide surface 8 holds the roller 4 inserted into the pocket 7, so that a snap margin (roller insertion portion 10) is held. The roller 4 is formed in a shape that prevents the roller 4 from inadvertently coming out of the pocket 7.

  Specifically, one end of the roller guide surface 8 is a protruding edge 8a that prevents the roller from dropping from the pocket, and the width dimension thereof is shown in FIGS. 1 (b) and 2 (b). Or, as shown in FIG. The other end has a roller insertion portion 10 formed at a distance slightly smaller than the diameter of the outer diameter of the roller. Between the roller insertion portion 10 and the roller guide surface 8, a snap margin (boundary portion 10a) is formed.

  The roller guide surface 8 is formed in a substantially arc shape between the protruding edge portion 8 a and the roller insertion portion 10. That is, in the pocket 7 of the cage 5, as shown in FIG. 1 (b), FIG. 2 (b), or FIG.

  From the above, according to the present embodiment, the retainer 5 and the roller 4 of the rolling element are not easily separated (does not come off), so that the assembling property can be improved. It is possible to prevent the rolling element roller 4 from being scattered in all directions.

(Second Embodiment)
FIG. 4A is a sectional view of a thrust bearing retainer (flat bearing retainer) according to a second embodiment of the present invention, and FIG. 4B is an operational view thereof.

  The flat bearing includes a pair of washer plates 20 and 30 that are stacked on each other, a roller 4 that is a large number of rolling elements interposed between the washer members 20 and 30, and a large number of pockets 7 that accommodate each roller 4. And a plate-like cage 5 provided.

  In the pocket 7, as shown in FIG. 4A, a roller guide surface 8 is formed at a position facing the rolling surface 4 a of the roller 4.

  The roller guide surface 8 is machined into an arc shape having the same contour as the design shape by using a machining tool having a total shape along the rolling surface 4a, and the radius of curvature R thereof is equal to that of the rolling surface 4a. Slightly larger than the radius of curvature.

  One end of the roller guide surface 8 in the axial direction X is a protruding edge 8 a that prevents the roller 4 from falling off the pocket 7.

  Further, the roller guide surface 8 has a roller insertion portion 10 formed at a distance D slightly smaller than the diameter of the outer diameter of the roller 4 at the other end of the roller guide surface 8.

  Here, the roller insertion portion 10 is formed such that when the rolling surface 4a of the roller 4 is brought into contact and press-fitted, the interval D serving as the inner diameter thereof is elastically deformed to pass through the interval D.

  Therefore, when assembling the roller 4 into the pocket 7, the roller 4 can be press-fitted and assembled from the side where the roller insertion portion 10 is provided.

Then, in the cage 5, each adjacent pocket 7, is configured so that the direction of incorporating a roller 4 are opposite (arrow X ₁ and X _2).

  That is, the pockets 7 adjacent in the direction in which the rollers 4 are arranged are alternately formed for each pocket 7 adjacent in the axial direction X so that the overall shape of the pockets 7 is reversed.

  Further, the axial direction between the rolling surface 4a and the boundary portion 10a between the roller insertion portion 10 and the roller guide surface 8 is A, where A is the distance in the axial direction X between the rolling surface 4a of the roller 4 and the protruding edge portion 8a. When the distance at X is B, the radius of curvature R and the interval D of the roller guide surface 8 are set so that B> A is always satisfied.

  Further, in this cage 5, the roller guide surface 8 is processed using a processing tool having a total shape along the rolling surface 4a.

  Therefore, the roller guide surface 8 can be easily processed so as to have the same contour as the design shape, and an optimum shape as the roller rolling surface can be obtained.

  Further, according to the cage 5, the pocket 7 has a roller insertion portion 10 having an inner diameter smaller than the outer diameter of the roller 4 and elastically deforming the inner diameter so that the roller 4 can be inserted into the pocket 7. Is formed.

  Therefore, when assembling, the roller 4 can be easily incorporated into the pocket 7 simply by being pushed in from the roller insertion portion 10. Therefore, the assembly man-hour can be reduced.

  In addition, the cage 5 is configured so that the direction in which the rollers 4 are incorporated into each adjacent pocket 7 is reversed. For example, as shown in FIG. 4B, when the retainer 5 moves downward in the figure due to gravity and the protruding edge 8a and the rolling surface 4a come into contact with each other, the distance A described above (FIG. 4A). Reference) is zero. That is, the cage 5 is moved downward by a distance A. In the adjacent pocket 7, the distance B is shortened by the moving distance of the cage 5, but as described above, since B> A, B> 0 is always satisfied. That is, the rolling surface 4a and the roller insertion part 10 do not contact. Therefore, the roller insertion portion 10 is not worn, and the interval D is maintained even after a long operation time. Therefore, the roller 4 does not fall out of the pocket 7 and can maintain the guide of the cage 5 in a stable state. In addition, the protruding edge 8a and the rolling surface 4a have a very small contact angle, and therefore wear hardly occurs. Thus, according to this roller bearing, since it is comprised so that the direction which incorporates the roller 4 may be reversed for every adjacent pocket 7, it can be used for a long time in the stable state. Therefore, a stable operation state can be maintained regardless of the direction in which the roller bearing is attached.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

(A) is a top view of the integral-type thrust bearing retainer (flat bearing retainer) according to the first embodiment of the present invention, and (b) is an enlarged view of the pocket. (A) is a top view of the division | segmentation type thrust bearing retainer (flat bearing retainer) which concerns on the modification of 1st Embodiment of this invention, (b) is the enlarged view of the pocket. is there. FIG. 3 is a partial cross-sectional view of the integrated type thrust bearing cage (flat bearing cage) shown in FIGS. 1 (a), 1 (b) and 2 (a), 2 (b). (A) is related to 2nd Embodiment of this invention, and is sectional drawing of the cage for thrust bearings (cage for flat bearings), (b) is the operation | movement figure. (A) is a top view of the integrated type thrust bearing retainer (flat bearing retainer) according to the conventional example, and (b) is an enlarged view of the pocket. FIG. 6 is a partial cross-sectional view of an integral type thrust bearing cage (flat bearing cage) according to the conventional example shown in FIGS.

Explanation of symbols

4 Rolling roller 4a Rolling surface 5 Plate-shaped cage 5a Convex arc surface 5b Concave arc surface 7 Pocket 8 Roller guide surface 8a Projection edge 10 Roll insertion portion 10a Boundary portion

Claims (4)

In a thrust bearing retainer in which a roller of a rolling element is mounted on a thrust bearing that is interposed between a pair of raceways arranged in a stacked manner, and the rollers of the rolling element are evenly distributed.
A thrust bearing retainer, wherein a snapping margin is provided in a pocket of the retainer. The pocket of the cage has a roller guide surface facing the roller;
2. The thrust bearing holding according to claim 1, wherein the roller guide surface is configured to hold a roller inserted into the pocket so that the roller does not come out of the pocket inadvertently. 3. vessel. The roller guide surface is
The end on one side is a protruding edge that prevents the roller from dropping out of the pocket,
The thrust bearing retainer according to claim 2, wherein the other end has a roller insertion portion formed at a distance slightly smaller than the diameter of the outer diameter of the roller. .   The thrust bearing retainer according to claim 3, wherein the roller guide surface is formed in a substantially arc shape between the protruding edge portion and the roller insertion portion.

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