JP2009063099A - Raceway ring for rolling bearing, and self-aligning roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a raceway ring for a rolling bearing capable of making rolls smoothly roll. <P>SOLUTION: An inner ring 12 as a raceway ring for rolling bearing formed by fastening a plurality of divided inner ring members 12a and 12b, which are divided in the circumferential direction by cutting in the axial direction in a plane extending in the axial direction, is arranged in an abutment part 27 of the adjacent divided inner ring members 12a and 12b, and comprises a soft material 17 forming a raceway surface 18 continued to raceway surfaces 15a and 15b of the adjacent divided inner ring members 12a and 12b. With this structure, when forming the inner ring 12 by fastening the plurality of divided inner ring members 12a and 12b to each other, even if a stage difference and a gap is caused between the raceway surfaces 15a and 15b of the adjacent plurality of divided inner ring members 12a and 12b, the raceway surface 15 can be smoothed by the soft material 17 forming the raceway surface 18 continued to the raceway surfaces 15a and 15b of the divided inner ring members 12a and 12b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing ring for a rolling bearing and a self-aligning roller bearing, and in particular, a bearing ring for a rolling bearing formed by fastening a plurality of divided bearing ring members, and an automatic equipped with such a bearing ring for a rolling bearing. The present invention relates to a spherical roller bearing.

  The bearing used for the main shaft of the wind power generator needs to receive a radial load against the weight of the blade for receiving the wind and an axial load against the wind force. Furthermore, the main shaft of the wind power generator has a structure that cantilever-supports the tip side where the blade is provided. Therefore, the main shaft of the wind power generator uses a self-aligning roller bearing that can receive a radial load and an axial load and can cope with the deflection of the main shaft.

  FIG. 6 is a schematic cross-sectional view of a self-aligning roller bearing used for a main shaft of a wind power generator. Referring to FIG. 6, self-aligning roller bearing 101 includes an inner ring 102, an outer ring 105, a plurality of spherical rollers 103a and 103b arranged in a double row between inner ring 102 and outer ring 105, and a plurality of spherical rollers. It is comprised from the holder | retainer 104 holding 103a, 103b. The self-aligning roller bearing 101 is attached to a main shaft 112 provided with a blade 111 for receiving wind on the distal end side, and is incorporated in a housing 113.

  Since the wind power generator is large, the self-aligning roller bearing used for the main shaft of the wind power generator also needs to be large. If it does so, the bearing structural member which comprises a self-aligning roller bearing, such as an inner ring and an outer ring, will also become large. In this case, work such as installation of the bearing and replacement of the bearing constituent member becomes difficult, and therefore it is preferable to divide the bearing constituent member into a plurality of members. Here, a technique for dividing an inner ring and an outer ring, which are bearing components constituting a self-aligning roller bearing, is disclosed in Japanese Patent Laid-Open No. 2002-139032 (Patent Document 1).

  In Patent Document 1, the inner ring is divided into two divided bodies in the circumferential direction by cutting in an axial direction along a plane including the rotation center axis. Further, the two divided bodies are integrally coupled by fitting a fastening ring to a fitting portion protruding in the axial direction and fastening the fastening ring with a fastening bolt.

Here, the direction which divides | segments the inner ring | wheel which is a bearing structural member is demonstrated. FIG. 7 is a perspective view showing the divided inner ring member 123. In addition, the rotation center axis | shaft 120 of a self-aligning roller bearing is shown with the dashed-dotted line. An arrow A indicates the axial direction. The plane 122 is a virtual plane indicating a surface to be cut. Referring to FIG. 7, the divided inner ring member 123 is divided in the circumferential direction by cutting the inner ring in the axial direction along a plane 122 that extends in the axial direction and includes the rotation center shaft 120.
JP 2002-139032 A (paragraph numbers 0010, 0017 to 0021)

  When forming an integral race ring from a plurality of divided bodies, it is necessary to combine the divided bodies. According to Patent Document 1, the two divided bodies are joined by tightening a tightening ring with a tightening bolt. In this case, there is a possibility that a step or a gap is generated on the track surface of the adjacent divided body. Then, it is difficult to roll the rollers smoothly.

  An object of the present invention is to provide a bearing ring for a rolling bearing capable of smoothly rolling a roller.

  Another object of the present invention is to provide a self-aligning roller bearing capable of smoothly rolling a roller.

  Still another object of the present invention is to provide a main shaft support structure for a wind power generator capable of extending the life.

  The rolling bearing race ring according to the present invention is for a rolling bearing formed by fastening a plurality of divided race ring members having a shape divided in the circumferential direction by being cut in the axial direction by a plane extending in the axial direction. It is a bearing ring, It is arrange | positioned at the butt | matching part of an adjacent division | segmentation bearing ring member, and is provided with the soft substance which forms the raceway surface which continues with the raceway surface of an adjacent division | segmentation race ring member.

  By doing so, even when a plurality of divided divided race ring members are fastened to form a rolling bearing race ring, even when a step or a gap occurs on the raceway surface of the adjacent divided race ring member. The track surface can be smoothed by the soft material that is disposed in the abutting portion and forms a track surface that is continuous with the track surface of the divided race ring member. If it does so, a roller can be rolled smoothly. Here, the soft substance means a substance composed of a material softer than the material of the divided raceway member.

  Preferably, the soft substance is a resin or a soft metal.

  More preferably, the adjacent divided race ring members have receding portions that recede from the raceway surface across the respective divided race ring members, and the soft material is disposed in the receding portions. By doing so, the soft substance can be arranged using the receding portion. Therefore, it is possible to increase the holding force of the soft substance and to more smoothly connect the raceway surfaces of the adjacent divided raceway members.

  More preferably, the divided race ring member includes a contact surface that contacts the soft material, and the surface roughness of the contact surface is rougher than the surface roughness of the track surface. By doing so, it is possible to increase the adhesion between the soft material and the split race ring member, reduce the risk of the soft material peeling off from the split race ring member, and increase the holding force.

  In another aspect of the present invention, a self-aligning roller bearing includes any of the above-described rolling bearing races.

  Since the self-aligning roller bearing provided with such a bearing ring for rolling bearing can smoothly roll the roller, the life of the bearing can be extended.

  In still another aspect of the present invention, the main shaft support structure of the wind power generator includes the above-described self-aligning roller bearing.

  Since the main shaft support structure of a wind power generator provided with such a self-aligning roller bearing includes a self-aligning roller bearing capable of smoothly rolling the rollers, it is possible to extend the life.

  According to this invention, even when a plurality of divided divided race ring members are fastened to form a rolling bearing race ring, even when a step or a gap occurs on the raceway surfaces of adjacent divided race ring members. The track surface can be smoothed by the soft material that is disposed in the abutting portion and forms a track surface that is continuous with the track surface of the divided race ring member. If it does so, a roller can be rolled smoothly.

  In addition, since the self-aligning roller bearing according to the present invention includes the above-described rolling bearing raceway, the roller can be smoothly rolled. Therefore, the life of the bearing can be extended.

  Moreover, since the spindle support structure of the wind power generator according to the present invention includes the self-aligning roller bearing capable of smoothly rolling the above-described roller, the life can be extended.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a self-aligning roller bearing 11 including a rolling bearing raceway according to an embodiment of the present invention. In addition, the rotation center shaft 9 of the self-aligning roller bearing 11 is indicated by a one-dot chain line.

  Referring to FIG. 1, a self-aligning roller bearing 11 includes an inner ring 12 as a bearing ring for a rolling bearing according to an embodiment of the present invention and an outer ring as a bearing ring for a rolling bearing according to an embodiment of the present invention. 13, spherical rollers 14 and 43 as a plurality of rolling elements arranged in a double row between the inner ring 12 and the outer ring 13, and cages 10 and 45 that hold the plurality of spherical rollers 14 and 43.

  The inner ring 12 is incorporated on the outer peripheral side of a rotating shaft (not shown). The inner ring 12 includes two rows of raceway surfaces 15 and 44 on the outer diameter side. The spherical rollers 14 and 43 roll on the raceway surfaces 15 and 44. The inner ring 12 includes small collars 40 and 42 at both ends in the width direction. The inner ring 12 includes a middle collar 41 between the two rows of raceway surfaces 15 and 44. The intermediate collar 41 allows the spherical rollers 14 and 43 to roll on the raceway surfaces 15 and 44 appropriately.

  The outer ring 13 includes a raceway surface 16 on the inner diameter side. Since the raceway surface 16 of the outer ring 13 has a spherical shape centered on the center of the bearing, the spherical rollers 14 and 43 are appropriately placed on the raceway surface 16, that is, on the raceway surface 16 even when the outer ring 13 is inclined. The spherical rollers 14 and 43 can roll without hitting each other.

  2 is a cross-sectional view of the self-aligning roller bearing 11 shown in FIG. 1 taken along a plane including the line II-II in FIG. 1 and intersecting the rotation axis. Further, in the following drawings, from the viewpoint of facilitating understanding, gaps, steps, and the like generated when the divided inner ring member and the divided outer ring member are coupled and fastened are exaggerated.

  1 and 2, the inner ring 12 is formed of two divided inner ring members 12a and 12b. Specifically, the inner ring 12 extends in the axial direction at the abutting portion 27, and is divided into two in the circumferential direction by being cut in the axial direction along a plane including the rotation center shaft 9. It is formed by joining and fastening 12a and 12b. Each of the divided inner ring members 12 a and 12 b has a shape obtained by cutting the annular inner ring 12 along a plane including the rotation center axis 9. The divided inner ring members 12a and 12b have arcuate track surfaces 15a and 15b on the outer diameter side. The raceway surface 15 of the inner ring 12 is formed so as to connect the raceway surfaces 15a and 15b of the divided inner ring members 12a and 12b.

  Further, the divided inner ring members 12a and 12b have retracted portions 26a and 26b in which the raceway surfaces 15a and 15b are retracted to the inner diameter side. Specifically, the retreating portions 26a and 26b have shapes in which portions corresponding to the raceway surfaces 15a and 15b are cut to the inner diameter side. The retreating portions 26a and 26b are provided in the abutting portion 27 so as to straddle the divided inner ring members 12a and 12b.

  Here, the case where the inner ring 12 is formed by joining the divided inner ring members 12a and 12b and fastening them together will be described. First, the divided inner ring members 12a and 12b are arranged on the outer peripheral side of the rotating shaft and coupled so that the raceway surfaces 15a and 15b are connected. Specifically, the divided inner ring members 12a and 12b are arranged and coupled so that the surface 22a of the divided inner ring member 12a located at the abutting portion 27 and the surface 22b of the divided inner ring member 12b face each other. Next, the joined divided inner ring members 12a and 12b are fastened and fixed. In this case, for example, the inner ring members 12a and 12b are fastened by arranging and tightening a tightening ring (not shown) on the outer diameter side of the small brim 40.

  In this case, when the divided inner ring members 12a and 12b are fastened, there is a possibility that a step or a gap is generated between the raceway surfaces 15a and 15b as shown by the dotted lines in FIG. Here, the soft material 17 is disposed on the raceway surfaces 15a and 15b side of the abutting portion 27 and the retreating portions 26a and 26b. In the retreating portions 26a and 26b, the soft substance 17 and the retreating portions 26a and 26b are arranged so as to abut on the abutting surfaces 23a and 23b. The soft material 17 forms a raceway surface 18 that is continuous with the raceway surfaces 15a and 15b of the divided inner ring members 12a and 12b in the circumferential direction. In this way, the inner ring 12 is formed. That is, the inner ring 12 includes a soft material 17 that is disposed at the abutting portion 27 of the adjacent divided inner ring members 12a and 12b and forms a raceway surface 18 that is continuous with the raceway surfaces 15a and 15b of the adjacent split inner ring members 12a and 12b. It is a configuration. The soft substance 17 includes, for example, a resin or a soft metal. Furthermore, the soft substance 17 may be a combination of a resin and a soft metal. Here, examples of the resin include polyamide, polyester, polyphenylene sulfide, and the like. Examples of the soft metal include carbon steel, general structural rolled steel, and copper.

  By doing so, when the inner ring 12 is formed by fastening the plurality of divided inner ring members 12a and 12b, a step or a gap is generated on the raceway surfaces 15a and 15b of the adjacent divided inner ring members 12a and 12b. Even so, the raceway surface 15 can be smoothed by the soft material 17 that is disposed in the abutting portion 27 and forms the raceway surface 18 that is continuous with the raceway surfaces 15a and 15b of the divided inner ring members 12a and 12b. If it does so, the spherical roller 14 can be rolled smoothly.

  Moreover, the soft substance 17 can be arrange | positioned using the retreat part 26a, 26b by providing the retreat part 26a, 26b in the division | segmentation inner ring member 12a, 12b. Therefore, the holding force of the soft substance 17 can be increased, and the raceway surfaces 15a and 15b can be connected more smoothly.

  Further, the soft material 17 and the receding portions 26a and 26b come into contact with each other at the contact surfaces 23a and 23b. The surface roughness of the contact surfaces 23a and 23b is provided to be rougher than the surface roughness of the raceway surfaces 15a and 15b. ing. By doing so, the adhesiveness between the soft substance 17 and the divided inner ring members 12a and 12b can be improved, and the holding force can be increased by reducing the possibility that the soft substance 17 is peeled off from the divided inner ring members 12a and 12b.

  Similarly, the outer ring 13 is formed of two divided outer ring members 13a and 13b. Specifically, the outer ring 13 extends in the axial direction at the abutting portion 28, and is divided in the circumferential direction by being cut in the axial direction along a plane including the rotation center shaft 9. It is formed by joining 13a and 13b and fastening. The divided outer ring members 13 a and 13 b each have a shape obtained by cutting the annular outer ring 13 along a plane including the rotation center axis 9. The divided outer ring members 13a and 13b have arcuate raceway surfaces 16a and 16b on the inner diameter side. The raceway surface 16 of the outer ring 13 is formed so as to connect the raceway surfaces 16a and 16b of the divided outer ring members 13a and 13b.

  Similarly, the divided outer ring members 13a and 13b also have retreat portions 21a and 21b. The retreating portions 21a and 21b of the divided outer ring members 13a and 13b retreat the raceway surfaces 16a and 16b to the outer diameter side. Specifically, the retreating portions 21a and 21b have a shape in which portions corresponding to the raceway surfaces 16a and 16b are cut to the outer diameter side. The retreating portions 21a and 21b are provided across the respective split outer ring members 13a and 13b at the abutting portion 28.

  Further, the case where the outer ring 13 is formed by joining the divided outer ring members 13a and 13b and fastening them together will be described. First, the divided outer ring members 13a and 13b are joined so that the raceway surfaces 16a and 16b are connected to the inner ring 12, the retainers 10 and 45, and the spherical rollers 14 and 43 that are incorporated in advance on the outer peripheral side of the rotating shaft. Specifically, the divided outer ring members 13a and 13b are arranged and coupled so that the surface 24a of the divided outer ring member 13a located at the abutting portion 28 and the surface 24b of the divided outer ring member 13b face each other. Next, the joined split outer ring members 13a and 13b are fastened and fixed.

  Then, the soft material 19 is disposed on the raceway surfaces 16a and 16b side of the abutting portion 28 and the retreat portions 21a and 21b. In the retreating portions 21a and 21b, the soft substance 19 and the retreating portions 21a and 21b are arranged so as to abut on the abutting surfaces 25a and 25b. The soft material 19 forms a raceway surface 20 that is continuous with the raceway surfaces 16a and 16b of the split outer ring members 13a and 13b in the circumferential direction. In this way, the outer ring 13 is formed. That is, the outer ring 13 includes a soft material 19 that is disposed at the abutting portion 28 of the adjacent divided outer ring members 13a and 13b and forms a raceway surface 20 that is continuous with the raceway surfaces 16a and 16b of the adjacent split outer ring members 13a and 13b. It is a configuration.

  Since the spherical roller bearing 11 including the inner ring 12 and the outer ring 13 can smoothly roll the spherical rollers 14 and 43, the life of the bearing can be extended.

  In the above-described embodiment, the split inner ring members 12a and 12b are provided with the retracted portions 26a and 26b before the split inner ring members 12a and 12b are fastened. However, the split inner ring members 12a and 12b are fastened. Later, the retreating portions 26a and 26b may be provided by cutting the raceway surfaces 15a and 15b located at the abutting portion 27.

  In the above-described embodiment, the example in which the retracting portion is provided in the divided inner ring member has been described. However, a soft material may be disposed so as to fill the gap generated in the abutting portion without providing the retracting portion. FIG. 3 is a diagram illustrating an example in which the soft material 31 is arranged in the gap generated in the abutting portion 32. The soft material 31 is continuous with the raceway surfaces 33a and 33b of the divided inner ring members 30a and 30b to form a raceway surface 34. Such a soft material 31 can also smooth the raceway surface. Similarly, in the split outer ring member, a soft substance may be arranged so as to fill a gap generated in the abutting portion without providing the retracted portion.

  Further, a recessed groove extending so as to be recessed from the contact surface toward the inner diameter side may be provided in the retracted portion of the divided inner ring member. By using the concave groove, the risk of the soft substance peeling off from the divided inner ring member can be reduced, and the raceway surface can be formed. Further, the concave groove may extend to be recessed toward the inner diameter side, and may further have a shape extending in the circumferential direction or the axial direction. In addition, you may decide to provide a ditch | groove similarly in the receding part of a division | segmentation outer ring member.

  In the above-described embodiment, the inner ring is formed from two divided inner ring members. However, the inner ring may be formed from three or more divided inner ring members. Even in this case, the raceway surface can be smoothed by the soft material that is disposed at the abutting portion of the adjacent split inner ring member and forms a raceway surface that is continuous with the raceway surface of the adjacent split inner ring member. Similarly, the outer ring may be formed of three or more divided outer ring members.

  In the above-described embodiment, an example has been described in which the inner ring extends in the axial direction and is cut in the axial direction on a plane including the rotation center axis. However, the inner ring is a plane extending in the axial direction without including the rotation center axis. It may be cut in the axial direction.

  4 and 5 show an example of a main shaft support structure of a wind power generator to which a self-aligning roller bearing according to an embodiment of the present invention is applied as a main shaft support bearing 75. FIG. The casing 73 of the nacelle 72 that supports the main components of the main shaft support structure is installed on the support base 70 via a swivel bearing 71 at a high position so as to be horizontally rotatable. A main shaft 76 that fixes a blade 77 that receives wind power at one end is rotatably supported in a casing 73 of the nacelle 72 via a main shaft support bearing 75 incorporated in a bearing housing 74. The other end of the main shaft 76 is connected to a speed increaser 78, and the output shaft of the speed increaser 78 is coupled to the rotor shaft of the generator 79. The nacelle 72 is turned at an arbitrary angle by the turning motor 80 via the speed reducer 81.

  The main shaft support bearing 75 incorporated in the bearing housing 74 is a self-aligning roller bearing according to an embodiment of the present invention. The bearing ring of the self-aligning roller bearing is formed by fastening a plurality of divided bearing ring members having a shape divided in the circumferential direction by being cut in the axial direction by a plane extending in the axial direction. The bearing ring of the self-aligning roller bearing includes a soft material that is disposed at the abutting portion of the adjacent split race ring member and forms a raceway surface that is continuous with the raceway surface of the adjacent split race ring member.

  The main shaft support structure of a wind power generator provided with such a self-aligning roller bearing is also provided with a self-aligning roller bearing capable of smoothly rolling the rollers, so that the life can be extended.

  In the above-described embodiment, the example using the double-row self-aligning roller bearing has been described. However, the present invention is not limited to this, and the present invention is also applicable to the case where a single-row self-aligning roller bearing is used.

  In the above embodiment, an example in which a spherical roller is used as the rolling element provided in the rolling bearing has been described. However, the present invention is not limited thereto, and a tapered roller, a cylindrical roller, a ball, or the like may be used.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The rolling bearing race of the present invention is effectively used for a self-aligning roller bearing. The self-aligning roller bearing of the present invention is effectively used for a main shaft support structure of a wind power generator. In addition, the main shaft support structure for a wind power generator according to the present invention is effectively used when a long life is required.

It is sectional drawing which shows an example of the self-aligning roller bearing provided with the bearing ring for rolling bearings concerning one Embodiment of this invention. It is sectional drawing at the time of cut | disconnecting the self-aligning roller bearing shown in FIG. 1 in the plane which includes line II-II in FIG. 1, and cross | intersects a rotating shaft. It is a figure which shows the example which has arrange | positioned the soft substance in the clearance gap which arose in the abutting part. It is a figure which shows an example of the spindle support structure of the wind power generator using the self-aligning roller bearing which concerns on this invention. FIG. 5 is a schematic side view of the main shaft support structure of the wind power generator shown in FIG. 4. It is a schematic sectional drawing of the self-aligning roller bearing used for the main axis | shaft of a wind power generator. It is a perspective view which shows a division | segmentation inner ring member.

Explanation of symbols

  9 Rotating center shaft, 10, 45 Cage, 11 Spherical roller bearing, 12 Inner ring, 12a, 12b, 30a, 30b Split inner ring member, 13 Outer ring, 13a, 13b Split outer ring member, 14, 43 Spherical roller, 15, 15a, 15b, 16, 16a, 16b, 18, 20, 33a, 33b, 34, 44 raceway surface, 17, 19, 31 soft material, 21a, 21b, 26a, 26b receding part, 22a, 22b, 24a, 24b surface , 23a, 23b, 25a, 25b Abutting surface, 27, 28, 32 Abutting portion, 40, 42 Small brim, 41 Middle brim, 70 Support base, 71 Swivel seat bearing, 72 Nacelle, 73 Casing, 74 Bearing housing, 75 Main shaft support bearing, 76 main shaft, 77 blade, 78 step-up gear, 79 generator, 80 turning motor, 81 speed reducer.

Claims (6)

A rolling bearing race ring formed by fastening a plurality of split race ring members having a shape divided in the circumferential direction by being cut in the axial direction by a plane extending in the axial direction,
A rolling bearing race ring comprising a soft material that is disposed at a butt portion of the adjacent divided race ring members and forms a raceway surface that is continuous with the raceway surfaces of the adjacent split race ring members. The bearing ring for a rolling bearing according to claim 1, wherein the soft substance is a resin or a soft metal. The divided raceway members adjacent to each other have a receding portion that recedes from the raceway surface across each of the divided raceway members,
The rolling bearing race according to claim 1, wherein the soft substance is disposed in the retracted portion. The divided race ring member includes a contact surface that contacts the soft material,
The rolling bearing race according to any one of claims 1 to 3, wherein the surface roughness of the contact surface is rougher than the surface roughness of the raceway surface. A self-aligning roller bearing comprising the rolling bearing bearing ring according to any one of claims 1 to 4. A main shaft support structure for a wind power generator, comprising the self-aligning roller bearing according to claim 5.

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