JP2012241802A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing using a segment type retainer in which segments and rolling elements do not fall off from an outer ring even if an inner ring is detached.SOLUTION: The rolling bearing includes an outer ring 11, an inner ring, a plurality of rolling elements 13 put between the outer ring 11 and the inner ring, and a retainer 14 rotatably holding the rolling elements 13 at intervals in the circumferential direction in which the retainer 14 is composed of a combination of a plurality of circumferentially divided segments 17. In the rolling bearing, the shortest linear length L1 or L2 of one segment 17a out of the segments 17 is set larger than the shortest distance A between segments at both ends when a gap between mutual other segments 17 is set to 0.

Description

  The present invention relates to a large-sized rolling bearing provided with a segment type cage, and is used for a large-sized device such as a wind power generator.

  Large-sized rolling bearings used in wind power generators and the like, like general rolling bearings, hold inner rings and outer rings, and a large number of rolling elements and rolling elements interposed between these race rings so as to be capable of rolling. Consists of containers. An annular integral type resin cage is used as the above cage, but it is difficult to manufacture an annular integral type resin cage in a large-sized rolling bearing. A divided cage, that is, a segment-type cage is used (for example, Patent Document 1).

  The rolling bearing disclosed in Patent Document 1 is a bearing for supporting a main shaft of a wind turbine generator, and a tapered roller bearing is used. Cylindrical roller bearings are used in the speed increaser of the wind power generator. Although this cylindrical roller bearing is smaller than the main shaft bearing, it is conceivable that a segment type cage is also used as a cage in the cylindrical roller bearing of the speed increaser as the apparatus becomes larger.

Japanese Patent No. 4105750

  However, since the segment type cage is separated and independent from each other, there is a problem that the segment and the rolling elements held by the segment fall off when either the inner ring or the outer ring is removed.

  Therefore, an object of the present invention is to provide a rolling bearing using a segment type cage, in which the segment and the rolling element do not fall off from the outer ring even if the inner ring is removed.

  In order to solve the above-described problems, the present invention provides an outer ring, an inner ring, a plurality of rolling elements interposed between the outer ring and the inner ring, and a holding that holds the rolling elements in a circumferentially spaced manner. In a rolling bearing comprising a combination of segments in which the cage is divided into a plurality of parts in the circumferential direction, the minimum linear length L of one of the segments has zero clearance between the other segments. In this case, the distance is set larger than the minimum distance A between the segments at both ends.

  According to the above configuration, when the inner ring is removed, the circumferential ends of the segments arranged annularly along the inner diameter surface of the outer ring come into contact with each other, and are squeezed with each other, so that they can fall to the inner diameter side. Is prevented.

  When the outer shape of the axial cross-sectional shape of the segment is a sector, the minimum straight line length L is the distance L1 between the outer diameter side end points a and b of both ends of the sector, or one end of the sector Is either the distance L2 between the outer diameter side end point a and the other end portion of the inner diameter side end point c. That is, the minimum straight line length L of the segment is either the distance L1 or L2 depending on the radius of curvature, the number of divisions, the radial height of the segment, and the like.

  Moreover, the pocket for rolling-element accommodation provided in the said segment can take the structure by which the circumferential direction opposing distance by the inner ring side was set smaller than the maximum diameter of the said rolling-element.

  According to the present invention, in a rolling bearing provided with a segment type cage, it is possible to obtain a configuration in which the segment does not fall off from the outer ring even if the inner ring is removed, and the handleability of the rolling bearing can be improved. Further, by adopting a configuration in which the circumferential facing distance on the inner ring side of the pocket of the segment is set to be smaller than the maximum diameter of the rolling element, it is possible to prevent the rolling element from falling off and to further improve the handleability. Can do.

1 is a partially cutaway perspective sectional view of Embodiment 1. FIG. FIG. 2 is a front view of the same. FIG. 3 is a partially enlarged front view of FIG. FIG. 4 is an enlarged cross-sectional view of the segment / rolling element set in the second embodiment. FIG. 5 is an enlarged cross-sectional view of another segment / rolling element set in the second embodiment. FIG. 6 is a front view in the middle of assembly of the rolling bearing in the third embodiment. FIG. 7 is a perspective view of the rolling bearing according to the fourth embodiment during assembly. FIG. 8 is a front view of the rolling bearing of the fifth embodiment. FIG. 9 is a partially enlarged front view of FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
[Embodiment 1]

  As shown in FIGS. 1 to 3, the rolling bearing according to the first embodiment includes an outer ring 11, an inner ring 12, a large number of rolling elements 13 interposed between the outer ring 11 and the inner ring 12, and the rolling elements 13. A retainer 14 is provided which is separated in the direction and can be freely rolled.

  The outer ring 11 is provided with flange edges 16 at both ends of the raceway surface 15. The rolling element 13 in this case is a cylindrical roller. The cage 14 is a segment type constituted by a combination of segments 17 divided into 10 in the circumferential direction, and the rolling elements 13 are accommodated and held in three pockets 18 provided in each segment 17 so as to be freely rollable. The

  Each segment 17 is annularly combined with a circumferential fitting gap. When the fitting clearance is larger than a certain value or when the segment 17 is shorter than a certain value, when the inner ring 12 is removed, the segment 17 and the rolling elements 13 held by the inner ring 12 fall off to the inner diameter side. As shown in FIG. 2, the state in which it is most likely to fall off is the fitting of the other segments 17 in the circumferential direction other than one segment 17 a (in order to distinguish it from the other segments 17, the reference numeral 17 a is attached in particular). This is when the clearance is zero. In this state, the distance in the circumferential direction between both end portions of the segment row formed by the other segments 17 becomes the maximum clearance X.

  The conditions under which the segment 17a existing in the maximum clearance X does not fall off in the inner diameter direction are as follows.

  As shown in FIG. 3, the minimum distance A of the maximum gap X is defined by the inner diameter side end point x1 of one end portion of the segment row formed by the other segments 17 excluding the segment 17a and the other end portion. This is the distance between the inner diameter side end points x2.

  The minimum straight line length L of the segment 17a that determines whether or not the segment 17a passes this minimum distance A is either L1 or L2 shown in FIG.

  That is, since the outer shape of the axial cross-sectional shape of the segment 17a has a sector shape, the distance between the outer diameter side end points a and b at both ends of the sector shape is L1, the outer diameter side end point a at one end portion and the other end When the distance between the inner diameter side end point c of the part is L2, normally L1> L2 and L2 is the minimum straight line length L as shown in the figure. Therefore, by setting the relationship L2> A, both end surfaces of the segment 17a come into contact with the end surfaces of the segments 17 on both sides, and are squeezed with each other, so that falling off in the inner diameter direction can be prevented. .

However, there are cases where L1 <L2 geometrically as the outer shape approaches a rectangle due to the radius of curvature of the segments 17, 17a, the number of divisions, the radial height of the segment 17, and the like. In this case, the segment 17a can be prevented from falling off by selecting the distance L1 as the minimum straight line length L and setting L1> A.
[Embodiment 2]

  In addition to the measures for preventing the segment 17 from falling off in the first embodiment, the second embodiment relates to measures for preventing the rolling elements 13 from dropping from the segment 17.

  As shown in FIG. 4, the circumferential facing surfaces of the pockets 18 provided in the segment 17 are formed in parallel, but the inner surface of the facing end surface is the inner surface of the opening end portion on the inner ring 12 side. A protrusion 19 is provided so as to protrude into the area. Since the opposing distance B in the circumferential direction between the protrusions 19 is set to be smaller than the maximum diameter of the rolling element 13, the rolling element 13 is prevented from falling off due to its own weight. Thereby, not only the segment 17 but also the rolling element 13 can be prevented from falling off, and the handling property of the segment / rolling element set in the bearing assembly process is improved.

In the case of FIG. 5, the facing surface of the pocket 18 is formed in an arc shape along the outer diameter surface of the rolling element 13, but the mounting surface 21 parallel to each other is formed on the facing surface of the opening end on the inner ring 12 side. Is provided. In this case, the distance C between the assembled surfaces 21 and the distance D on the outer ring 11 side are both set smaller than the diameter of the rolling element 13. The rolling element 13 is assembled by press-fitting from the assembling surface 21 or by heating the segment 17 to increase the distances C and D. Also in this case, not only the segment 17 but also the rolling element 13 can be prevented from falling off, and the handleability of the segment / rolling element set in the bearing assembly process is improved.
[Embodiment 3]

  In general, in the segment-type cage 14, when the segment 17 is arranged along the inner diameter surface of the outer ring 11, when the last segment 17 is assembled from the inner diameter side, it is inserted by press-fitting between the arranged segments 17. Do.

  In order to perform this press-fit smoothly, in the cage 14 according to the third embodiment, as shown in FIG. 6, one end surface in the circumferential direction of each segment 17 is formed on the convex partial cylindrical surface 22, The other end face is formed in a complementary concave partial cylindrical surface 23 that receives the convex shape.

  When assembling the segments 17, the convex partial cylindrical surface 22 and the concave partial cylindrical surface 23 of each segment 17 are sequentially fitted along the inner diameter surface of the outer ring 11, and the last two segments 17 are assembled. In this case, the convex partial cylindrical surface 22 of one segment 17 and the concave partial cylindrical surface 23 of the other segment 17 are abutted on the inner diameter side of the array (see the solid line state in FIG. 6), and each other end is used as a fulcrum. Push the butted part to the outer diameter side (see white arrow).

Both segments 17 fit into the inner surface of the outer ring 11 while sliding and rotating at the fulcrum portion and the butting portion, so that they can be smoothly press-fitted (see the two-dot chain line in FIG. 6).
[Embodiment 4]

  As described in the second embodiment (see FIGS. 4 and 5), in order to prevent the rolling element 13 from falling off, the facing distance C of the inner ring side opening of the pocket 18 of the segment 17 is set to It is set smaller than the diameter. By setting the size of the facing distance C in this case to a size that allows the rolling elements 13 to pass by elastically deforming the portion of the pocket 18 of the segment 17, there is the following convenience.

  That is, as shown in FIG. 7, when the number of segments 17 is N, numbers A to N are assigned to the segments in the order of arrangement, and the segments 17A to 17N are called. When these segments 17A to 17N are arranged in this order on the inner diameter surface of the outer ring 11, the rolling elements 13 are accommodated in the respective pockets 18 while being in contact with each other so as not to cause circumferential clearance. Incorporate from. Finally, when the segment 17N is assembled, the empty segment 17N is assembled from the axial direction without housing the rolling elements 13 (see the white arrow in FIG. 7).

  As described above, since the portion of the pocket 18 can pass through the rolling element 13 by elastic deformation, after the segment 17 is assembled, the rolling element 13 is press-fitted from the inner diameter side while the pocket 18 is elastically deformed.

As a result, the movement of each segment 17 in the axial direction is limited by the flange edge of the outer ring 11 through the rolling elements 13. Further, as described in the first embodiment, when the condition of L1> A or L2> A is satisfied (in the case of FIG. 7, it is assumed that L2> A is satisfied), the movement in the radial direction is the mutual of the segments 17. Limited by clashes. For this reason, the segment 17 and the rolling element 13 can be prevented from falling off from the outer ring.
[Embodiment 5]

  Embodiment 5 shown in FIG.8 and FIG.9 shows the case where the height of the internal diameter direction of the circumferential direction both ends of the segment 17 is formed larger than another part. Specifically, by providing ribs 24 on the inner diameter surfaces of both end portions, the height H2 at both end portions is formed higher than the height H1 in the above-described case (see FIGS. 2 and 3). The rib 24 is formed in a shape having a surface common to both end surfaces of the segment 17 so as to form a part of the contact surface of the segment 17. However, the height H2 of the rib 24 has a limitation that it cannot exceed the size of the gap between the outer ring 11 and the inner ring 12.

If the height of the segment 17 is set to be large over the entire length, smooth flow of the lubricating oil in the axial direction is prevented. There is nothing.
[Other embodiments]

  By setting the lengths of the segments 17 in the circumferential direction to two or more types, the dimensional variation of the minimum distance A can be suppressed. In other words, the minimum distance A may vary greatly due to manufacturing errors in the circumferential length of the segment and the inner diameter of the outer ring 11, but the minimum distance A can be finely adjusted by combining segments 17 having different lengths. .

  Further, by making the total number of rolling elements 13 a multiple of the segment 17, each segment 17 can have the same size, and a plurality of molds are not required when the segment 17 is made of resin and manufactured by injection molding. There are advantages.

  In each of the embodiments described above, the example in which the segments 17 abut each other with the column portions extending in the axial direction at both ends thereof is described. The same applies to the case where both end portions of the partial annular portion abut. As an assembling method, a method of cooling after arranging the segments 17 and the rolling elements 13 on the thermally expanded outer ring 11 can also be adopted.

11 outer ring 12 inner ring 13 rolling element 14 cage 15 raceway surface 16 flange edge 17, 17a segment 18 pocket 19 projection 21 incorporating surface 22 convex partial cylindrical surface 23 concave partial cylindrical surface 24 rib

Claims (10)

  An outer ring, an inner ring, a plurality of rolling elements interposed between the outer ring and the inner ring, and a cage that holds the rolling elements in a circumferentially spaced manner so that the rolling elements can freely roll. In a rolling bearing comprising a combination of segments divided into two, the minimum linear length L of one of the segments is the minimum distance A between the segments at both ends when the gap between the other segments is zero. Rolling bearing characterized by being set larger.   The external shape of the axial cross-sectional shape of the segment is a sector, and the minimum straight length L is the distance L1 between the outer diameter side end points a and b of both ends of the sector or the outside of one end of the sector. The rolling bearing according to claim 1, wherein the rolling bearing is any one of a distance L <b> 2 between the radial end point a and the inner end c of the other end.   The rolling bearing according to claim 1 or 2, characterized in that in the pocket for storing rolling elements provided in the segment, a circumferential facing distance on the inner ring side thereof is set smaller than a maximum diameter of the rolling elements. .   The rolling bearing according to claim 3, wherein in the pocket for storing rolling elements provided in the segment, a circumferential facing distance on the outer ring side is smaller than a maximum diameter of the rolling elements.   The axial cross-sectional shape of one end portion in the circumferential direction of the segment is a convex partial cylindrical shape, and the axial cross-sectional shape of the other end portion is a concave partial cylindrical shape complementary to the above. The rolling bearing according to any one of claims 1 to 4.   6. The distance between the pockets of the segments on the inner ring side in the circumferential direction is set to a dimension that allows the rolling elements to pass by elastically deforming the segments. The rolling bearing described.   The rolling bearing according to any one of claims 1 to 6, wherein a height in an inner diameter direction of both end portions in a circumferential direction of the segment is formed larger than that of other portions.   The rolling bearing according to claim 7, wherein ribs having end faces common to both end faces in the circumferential direction of the segment are provided on inner diameter faces of both ends of the segment.   The rolling bearing according to any one of claims 1 to 8, comprising a combination of two or more types of segments having different circumferential lengths.   The rolling bearing according to claim 1, wherein the total number of the rolling elements is a multiple of the number of the segments.

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