JP2008185167A - Roller bearing, retainer segment, and main shaft supporting structure for wind power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing improved in workability during its assembly. <P>SOLUTION: A tapered roller bearing comprises an outer ring, an inner ring, a plurality of tapered rollers arranged between the outer ring and inner ring, a plurality of pillar sections 14a to 14e extending axially so as to form pockets 13a to 13d retaining the tapered rollers, a plurality of retainer segments 11a having a pair of connecting sections 15a and 15b extending circumferentially so as to connect the plurality of the pillar sections 14a to 14e and being successively continuously arranged circumferentially between the outer ring and inner ring. An outer diameter side roller stopping section and bore side roller stopping section for preventing pulling-out of the tapered rollers are arranged on side wall surfaces 23 of the pockets 13a to 13d. One connecting section 15b and the plurality of pillar sections 14a to 14e among the retainer segments 11a can be separable. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a roller bearing, a cage segment, and a main shaft support structure for a wind power generator, and in particular, a large roller bearing, a cage segment included in the large roller bearing, and a wind power generator including such a large roller bearing. The present invention relates to a main shaft support structure.

  The roller bearing is generally composed of an outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, and a cage that holds the plurality of rollers. There are various types of cages for holding rollers, such as resin cages, press cages, shaving cages, and welded cages, depending on the material and manufacturing method. ing. In addition, the cage is usually composed of a single piece, that is, an annular part.

  A roller bearing that supports a main shaft of a wind power generator to which a blade for receiving wind is attached needs to receive a large load, so that the roller bearing itself is also large. If it does so, each structural member which comprises a roller bearing, such as a roller and a holder | retainer, will also become large sized, and production and assembly of a member will become difficult. In such a case, if each member can be divided, production and assembly are facilitated.

  Here, a technique relating to a split type retainer in which a retainer included in a roller bearing is divided by a dividing line extending in a direction along the axis is disclosed in European Patent Publication No. 1408248A2 (Patent Document 1). FIG. 11 is a perspective view showing a cage segment which is a split type cage disclosed in Patent Document 1. FIG. Referring to FIG. 11, cage segment 101a includes a plurality of pillar portions 103a, 103b, 103c, 103d, 103e extending in a direction along the axis so as to form a plurality of pockets 104 for accommodating rollers, and a plurality of pillars. It has the connection parts 102a and 102b extended in the circumferential direction so that the parts 103a-103e may be connected.

12 is a cross-sectional view showing a part of the roller bearing including the cage segment 101a shown in FIG. The configuration of the roller bearing 111 including the cage segment 101a will be described with reference to FIGS. 11 and 12. The roller bearing 111 holds an outer ring 112, an inner ring 113, a plurality of rollers 114, and a plurality of rollers 114. A plurality of cage segments 101a, 101b, 101c and the like. The plurality of rollers 114 are held by a plurality of cage segments 101a and the like in the vicinity of a PCD (Pitch Circle Diameter) 105 where the roller behavior is most stable. The cage segment 101a that holds the plurality of rollers 114 is continuously arranged so that the cage segments 101b and 101c having the same shape adjacent in the circumferential direction abut on the outermost pillar portions 103a and 103e in the circumferential direction. ing. A plurality of cage segments 101 a, 101 b, 101 c, etc. are connected to each other and incorporated into the roller bearing 111 to form one annular cage included in the roller bearing 111.
European Patent Publication 1408248A2

  The cage segment shown in Patent Document 1 is provided with a roller stopper for preventing the roller from falling off on the inner diameter side of the column portion. To assemble a roller bearing including such a cage segment, first place the cage segment on the raceway surface of the inner ring, and then hold the rollers sequentially from the outer diameter side in each pocket of the cage segment. Let the outer ring fit.

  Here, since the roller cannot be held in the pocket of the cage segment in advance, the cage segment cannot be integrated. That is, in the technique disclosed in Patent Document 1, even if the rollers are held in the pockets of the cage segments in advance, the rollers fall off from the outer diameter side, and the rollers and the cage segments are separated. Therefore, during assembly work, a space for separately arranging the cage segments before assembly is required, and workability is deteriorated. In particular, in the case of the large roller bearing described above, workability is greatly deteriorated.

  An object of the present invention is to provide a roller bearing with improved workability during assembly.

  Another object of the present invention is to provide a cage segment that is well assembled.

  Still another object of the present invention is to provide a main shaft support structure for a wind power generator with good productivity.

  A roller bearing according to the present invention includes an outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, a plurality of column portions extending in a direction along the axis so as to form a pocket for holding the roller, and It has a pair of connecting portions extending in the circumferential direction so as to connect the plurality of pillar portions, and includes a plurality of cage segments sequentially arranged in the circumferential direction between the outer ring and the inner ring. Here, roller stoppers that prevent the rollers held in the pocket from falling off are provided on the upper side and the lower side of the side wall surface of the pocket. Moreover, at least one connection part and several pillar parts are separable among cage | basket segments.

  With this configuration, even if the rollers are held in the cage segment pockets in advance, the roller stoppers provided on the upper side and the lower side of the side wall surfaces of the pockets prevent the rollers from coming off from the cage segments. Can be prevented. Further, when the rollers are held in the pockets, the rollers can be inserted and held from the connecting portion side with one connecting portion separated. Then, the roller can be easily held in the pocket. Therefore, the cage segment can be easily and reliably integrated, and the workability at the time of assembling the roller bearing can be improved.

  Here, the cage segment is a unit body obtained by dividing one annular cage by a dividing line extending in the direction along the axis so as to have at least one pocket for accommodating the rollers. A plurality of cage segments are connected to the roller bearing in a circumferential direction to form one annular cage.

  Preferably, both the connecting portions and the plurality of pillar portions are separable. By carrying out like this, the shape of each of a pair of connecting part and a plurality of pillar parts can be simplified. If it does so, productivity of each member which comprises a cage segment can be improved.

  More preferably, a fixing means for fixing the connecting portion and the column portion is provided. By doing so, the connecting portion and the column portion can be fixed after the rollers are held in the pockets. As a result, the handleability of the integrated cage segment and the roller is improved, and the workability at the time of assembling the roller bearing can be improved.

  Further, the fixing means may be a concavo-convex portion that is provided at a portion where the connecting portion and the column portion abut and engage with each other. By carrying out like this, a connection part and a pillar part can be fixed by fitting and engaging an uneven part. Therefore, the connecting portion and the column portion can be easily fixed.

  In another aspect of the present invention, the cage segment is a cage segment obtained by dividing one annular cage by a dividing line extending in a direction along the axis so as to have at least one pocket for accommodating the rollers. is there. The cage segment has a plurality of column portions extending in a direction along the axis so as to form a pocket for holding the rollers, and a pair of connection portions extending in the circumferential direction so as to connect the plurality of column portions. . Here, roller stoppers that prevent the rollers held in the pocket from falling off are provided on the upper side and the lower side of the side wall surface of the pocket. Moreover, at least one connection part and several pillar parts are separable among cage | basket segments.

  Such a cage segment prevents the roller from coming off from the cage segment by the roller stoppers provided on the upper side and the lower side of the side wall surface of the pocket even if the roller is held in the pocket of the cage segment in advance. Can be prevented. Further, when the rollers are held in the pockets, the rollers can be inserted and held from the connecting portion side with one connecting portion separated. Then, the roller can be easily held in the pocket.

  In still another aspect of the present invention, the main shaft support structure of the wind power generator includes a blade that receives wind power, a main shaft that is fixed to the blade, one end of which is fixed to the blade, and the main shaft that rotates together with the blade. And a roller bearing to be supported. The roller bearing includes an outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, a plurality of column portions extending in a direction along the axis so as to form a pocket for holding the roller, and the plurality of columns. And a plurality of retainer segments that are sequentially connected in the circumferential direction between the outer ring and the inner ring. Here, roller stoppers that prevent the rollers held in the pocket from falling off are provided on the upper side and the lower side of the side wall surface of the pocket. Moreover, at least one connection part and several pillar parts are separable among cage | basket segments.

  Such a main shaft support structure of a wind power generator can be easily and reliably integrated with the cage segment. Therefore, productivity is good.

  According to the present invention, even if the rollers are held in the pockets of the cage segments in advance, the roller stoppers provided on the upper side and the lower side of the side wall surface of the pockets prevent the rollers from coming off from the cage segments. be able to. Further, when the rollers are held in the pockets, the rollers can be inserted and held from the connecting portion side with one connecting portion separated. Then, the roller can be easily held in the pocket. Therefore, the cage segment can be easily and reliably integrated, and the workability at the time of assembling the roller bearing can be improved.

  In addition, even if such a cage segment holds the roller in the pocket of the cage segment in advance, the roller stopper portions provided on the upper side and the lower side of the side wall surface of the pocket can prevent the cage segment from Omission can be prevented. Further, when the rollers are held in the pockets, the rollers can be inserted and held from the connecting portion side with one connecting portion separated. Then, the roller can be easily held in the pocket.

  In addition, such a main shaft support structure of a wind power generator can be easily and reliably integrated with the cage segment. Therefore, productivity is good.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a view showing a cage segment 11a included in the tapered roller bearing according to the embodiment of the present invention. 3 is a cross-sectional view of the cage segment 11a shown in FIG. 2 as viewed from the direction of arrows III-III in FIG. From the viewpoint of easy understanding, in FIG. 3, the plurality of tapered rollers 12a, 12b, 12c, and 12d held by the cage segment 11a are indicated by dotted lines. Moreover, PCD22 is shown with a dashed-dotted line.

  With reference to FIG. 2 and FIG. 3, the structure of the cage segment 11a included in the tapered roller bearing will be described first. The cage segment 11a has a shape in which one annular cage is divided by a dividing line extending in the direction along the axis so as to have at least one pocket for accommodating the rollers. The cage segment 11a has five pillars 14a, 14b, 14c, 14d extending in the direction along the axis so as to form pockets 13a, 13b, 13c, 13d for holding the tapered rollers 12a, 12b, 12c, 12d. 14e and a pair of connecting portions 15a and 15b which are located at both ends in the axial direction and extend in the circumferential direction so as to connect the five pillar portions 14a to 14e. The end surfaces 16a and 16b on the side where the pockets 13a and 13d of the column portions 14a and 14e arranged on the outermost side are not flat are flat.

  The pair of connecting portions 15a and 15b have a predetermined radius of curvature in the circumferential direction so that when the plurality of cage segments 11a are incorporated into the tapered roller bearing, they form a single annular cage in the circumferential direction. have. Of the pair of connecting portions 15a and 15b, the radius of curvature of the connecting portion 15a located on the small diameter side of the tapered rollers 12a to 12d is smaller than the radius of curvature of the connecting portion 15b located on the large diameter side of the tapered rollers 12a to 12d. It is configured.

  The side wall surfaces 23 on both sides in the circumferential direction of the pocket 13a have a shape along the rolling surface of the tapered roller 12a held in the pocket 13a. That is, the side wall surface 23 is configured by a curved surface, and the interval between the side wall surfaces 23 becomes narrower from the PCD 22 toward the outer diameter side and the inner diameter side. Thus, on the upper side of the side wall surface 23, the outer diameter side roller stopper 25 for preventing the tapered roller 12a held in the pocket 13a from falling off to the outer diameter side is provided. Further, an inner diameter side roller stopper 24 for preventing the tapered roller 12a held in the pocket 13a from falling out toward the inner diameter side is provided on the lower side of the side wall surface 23. The upper side refers to the outer diameter side portion of the side wall surface 23 of the pocket 13a, and the lower side refers to the inner diameter side portion. Similarly, outer diameter side and inner diameter side roller stoppers 25 and 24 are also provided on the upper side and lower side of the side wall surface 23 on both sides in the circumferential direction of the pockets 13b, 13c, and 13d.

  By doing so, even if the tapered roller 12a held in the pocket 13a is about to fall off to the outer diameter side, the outer diameter side roller stopper 25 and the tapered roller 12a are caught. Then, the tapered roller 12a does not fall off from the outer diameter side of the cage segment 11a. Moreover, even if it falls out to the inner diameter side, the inner diameter side roller stopper 24 and the tapered roller 12a are caught. Then, the tapered roller 12a does not fall off from the inner diameter side of the cage segment 11a. Therefore, the tapered roller 12a held in the pocket 13a does not fall out of the cage segment 11a and can be reliably held in the pocket 13a.

  Here, one connection part 15b and several pillar part 14a-14e are separable. FIG. 1 is a view showing the cage segment 11a in a state where the connecting portion 15b is separated from the plurality of pillar portions 14a to 14e. With reference to FIG. 1, one connection part 15a and several pillar part 14a-14e are integrated in the holder | retainer segment 11a. On the other hand, the other connection part 15b can be removed from the edge part 19a of one side of each pillar part 14a-14e. That is, the connection part 15b is separable from the connection part 15a and the some pillar parts 14a-14e.

  In this case, the surface 20a on the pockets 13a to 13d side of the connecting portion 15b and the end portion 19a on the connecting portion 15b side of the plurality of column portions 14a to 14e abut. Here, the protruding portion 17a protruding in the longitudinal direction is provided at the end portion 19a of each of the column portions 14a to 14e. The surface 20a of the connecting portion 15 has a plurality of recesses 18a that are recessed so as to engage with the protrusions 17a at positions corresponding to the protrusions 17a provided on the end portions 19a of the pillars 14a to 14e. Is provided. Here, although the recessed part 18a is a hole shape which penetrates the connection part 15b, it does not need to penetrate. The connecting portion 15b and the column portions 14a to 14e can be fixed by fitting and engaging the convex portion 17a and the concave portion 18a as fixing means. In this way, the cage segment 11a is configured.

  Next, a method for holding the tapered rollers 12a to 12d in the pockets 13a to 13d of the cage segment 11a will be described. 1 to 3, first, tapered rollers 12a to 12d are held in the pockets 13a to 13d in a state where the connecting portion 15b is separated from the plurality of column portions 14a to 14e. In this case, the tapered rollers 12a to 12d are pushed forward from the connecting portion 15b side in the direction indicated by the arrow I in FIG. 1, and the tapered rollers 12a to 12d are inserted and held in the pockets 13a to 13d. And after holding the tapered rollers 12a-12d in each pocket 13a-13d, the connection part 15b is pushed in the direction of arrow I, and the connection part 15b and several pillar part 14a-14e are fixed. In this case, the concave portion 18a provided in the connecting portion 15b and the convex portions 17a provided in the plurality of column portions 14a to 14e are fitted, engaged, and fixed. In this manner, the tapered rollers 12a to 12d are held in the pockets 13a to 13d, and the cage segment 11a and the tapered rollers 12a to 12d are integrated.

  By configuring in this way, even if the tapered rollers 12a to 12d are held in the pockets 13a to 13d of the cage segment 11a in advance, the outer diameters provided on the upper side and the lower side of the side wall surface 23 of the pockets 13a to 13d. The side and inner diameter side roller stoppers 25 and 24 can prevent the tapered rollers 12a to 12d from falling out of the cage segment 11a. Then, the tapered rollers 12a to 12d can be reliably held in the pockets 13a to 13d. Further, when the tapered rollers 12a to 12d are held in the pockets 13a to 13d, the tapered rollers 12a to 12d are inserted from the connecting portion 15b side in a state where the connecting portion 15b is separated from the plurality of column portions 14a to 14e. Can be retained. Then, the tapered rollers 12a to 12d can be easily held in the pockets 13a to 13d. Therefore, the cage segment 11a and the tapered rollers 12a to 12d can be integrated easily and reliably, and workability at the time of assembling the tapered roller bearing described later can be improved.

  Moreover, since the connection part 15b and pillar part 14a-14e are being fixed by the fixing means, possibility that the connection part 15b will remove | deviate from pillar part 14a-14e reduces. If it does so, the handleability of the integrated holder | retainer segment 11a and the tapered rollers 12a-12d will become favorable.

  In this case, since the connecting portion 15b and the plurality of column portions 14a to 14e are fixed by fitting and engaging the concave portion 18a and the convex portion 17a, the connecting portion 15b and the plurality of column portions 14a to 14e No other members are required for fixing the slab. Therefore, it can be easily fixed.

  In addition, it is good also as a structure which can isolate | separate both a connection part and several pillar parts among cage | basket segments. FIG. 4 is a view showing a cage segment in this case. Referring to FIG. 4, the cage segment 11e includes a pair of connecting portions 15c and 15d and a plurality of pillar portions 14f, 14g, 14h, 14i, and 14j. Since the basic configuration is the same as that of the cage segment 11a shown in FIGS. 1 to 3, the description thereof will be omitted and the differences will be described. Each connection part 15c, 15d is separable from several pillar part 14f-14j. Convex portions 17b, 17c provided on both end portions 19b, 19c of the pillar portions 14f-14j and concave portions 18b provided on the surfaces 20b, 20c on the pockets 13e, 13f, 13g, 13h side of the respective connecting portions 15c, 15d, 18c is fitted and engaged, and each connection part 15c, 15d and several pillar part 14f-14j are fixed.

  Next, a method for holding the tapered rollers in the pockets 13e to 13h of the cage segment 11e will be described. First, the concave portion 18b and the convex portion 17b are fitted together to fix the one connecting portion 15c and the plurality of column portions 14f to 14j. Next, the tapered rollers are held in the pockets 13e to 13h. Thereafter, the concave portion 18c and the convex portion 17c are fitted and engaged, and the other connecting portion 15d and the plurality of column portions 14f to 14j are fixed. In this way, the cage segment 11e and the tapered roller are integrated. In addition, the tapered roller is previously disposed between the pillar portions 14f to 14j, and thereafter, the concave portion 18b and the convex portion 17b and the concave portion 18c and the convex portion 17c are fitted and engaged with each other, and both the connecting portions 15c, You may fix 15d and several pillar part 14f-14j.

  By adopting such a configuration, in addition to the effects described above, each of the connecting portions 15c and 15d and the column portions 14f to 14j has a relatively simple shape. Therefore, the productivity of each constituent member constituting the cage segment 11e can be improved.

  Next, a spacer that is included in the tapered roller bearing according to the embodiment of the present invention and that adjusts the circumferential clearance such as the cage segment 11a that is continuous in the circumferential direction will be described. FIG. 5 is a view showing a spacer 26 included in the tapered roller bearing. The structure of the spacer 26 will be described with reference to FIG. 5. The spacer 26 includes end portions 27 a and 27 b located at both ends in the axial direction and a central portion 28 located between the end portions 27 a and 27 b. . The axial distance between the end portions 27a and 27b is the same as the axial distance between the pair of connecting portions 15a and 15b included in the cage segment 11a. Further, the end surfaces 29a and 29b in the circumferential direction of the end portions 27a and 27b are flat like the end surfaces 16a and 16b of the column portions 14a and 14e of the retainer segment 11a. The spacer 26 does not have the pockets 13a to 13d for accommodating the tapered rollers 12a to 12d, and is different from the cage segment 11a having at least one pocket for accommodating the tapered rollers.

  Next, the configuration of the tapered roller bearing including the cage segment 11a and the spacer 26 will be described. FIG. 6 is a schematic cross-sectional view of a tapered roller bearing 31 in which a plurality of cage segments 11a, 11b, 11c, 11d and the like and a spacer 26 are arranged in the circumferential direction, as viewed from the axial direction. FIG. 7 is an enlarged cross-sectional view of a portion indicated by VII in FIG. Here, since the cage segments 11b, 11c, and 11d have the same configuration as the cage segment 11a, description thereof is omitted. In FIG. 6, the tapered rollers 34 held by the cage segment 11a and the like are omitted. In addition, here, among the plurality of cage segments 11a to 11d, the cage segment arranged first is the cage segment 11a, and the cage segment arranged last is the cage segment 11d.

  6 and 7, the tapered roller bearing 31 includes an outer ring 32, an inner ring 33, a plurality of tapered rollers 34, a plurality of cage segments 11 a to 11 d, and a spacer 26. The cage segments 11a to 11d are sequentially arranged in the circumferential direction. Here, first, the cage segment 11a is arranged first, and then the cage segment 11b is arranged so as to contact the cage segment 11a. Thereafter, the cage segment 11c is arranged so as to contact the cage segment 11b, the cage segments are sequentially arranged, and finally the cage segment 11d is arranged.

  Here, the method for assembling such a tapered roller bearing will be briefly described. First, as described above, the tapered rollers 34 are held in the pockets 35 of the cage segments 11a to 11d in advance, and the cage segments 11a to 11a. 11d and the tapered roller 34 are integrated. Next, what united cage segments 11a-11d and tapered roller 34 was arranged in a row in the circumferential direction. In this case, among the cage segments 11a to 11d, the end faces of the column portions located on the outermost sides are arranged in contact with each other. Then, the spacer 26 is disposed between the first cage segment 11a and the last cage segment 11d, and the tapered roller bearing 31 is assembled.

  With this configuration, the tapered rollers 34 are held in the cage segments 11a to 11d in advance, and the cage segments 11a to 11d and the tapered rollers 34 are integrated. The space for disposing the tapered rollers 34 before assembly can be omitted. In particular, when the tapered roller bearing 31 is large, the tapered roller 34, which is a constituent member, is also large, and it is necessary to secure a wide space for the tapered roller 34 to be disposed. However, if configured in this way, the space to be secured can be largely omitted.

  Next, the arrangement state of the spacer 26 arranged between the first cage segment 11a and the last cage segment 11d will be described. FIG. 8 is an enlarged cross-sectional view of a portion indicated by VIII in FIG. Referring to FIGS. 6 and 8, the cage segments 11a and the like are successively arranged so as to contact each other, and a spacer 26 is formed in the gap 39 formed between the cage segment 11a and the cage segment 11d. Arrange. In this case, in the cage segment 11d, the end surface 16c of the outermost column portion 14k and the end surface 29b of the end portion 27b of the spacer 26 are arranged to contact each other. By doing so, the dimension of the last clearance 40 in the circumferential direction generated between the cage segment 11a and the spacer 26 can be easily set in a range.

  Here, the first cage segment 11a refers to the cage segment that is placed first when the cage segments 11a to 11d are sequentially arranged in the circumferential direction, and the last cage segment 11d is When the adjacent cage segments 11a to 11d are brought into contact with each other and sequentially arranged in the circumferential direction, the cage segment is arranged last. When arranged in this manner, the gap 39 generated between the first cage segment 11a and the last cage segment 11d is adjusted by the spacer 26 so as to have an appropriate gap size. The last gap 40 is the first gap when the cage segments 11a to 11d and the like are arranged without a gap on the circumference, and the last cage segment 11d and the spacer 26 are arranged without a gap. This is the maximum clearance between the cage segment 11a and the spacer 26 disposed between the first cage segment 11a and the last cage segment 11d.

  9 and 10 show an example of a main shaft support structure of a wind power generator to which a tapered roller bearing according to one 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 to 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. 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 roller bearing according to an embodiment of the present invention. The main shaft support bearing includes a blade that receives wind force, one end of which is fixed to the blade, and rotates together with the blade. The main shaft and a roller bearing that is incorporated in the fixed member and rotatably supports the main shaft. The roller bearing includes an outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, a plurality of column portions extending in a direction along the axis so as to form a pocket for holding the roller, and the plurality of columns. A plurality of retainer segments that have a connecting portion extending in the circumferential direction so as to connect the portions, and are arranged sequentially in the circumferential direction between the outer ring and the inner ring. Here, roller stoppers that prevent the rollers held in the pocket from falling off are provided on the upper side and the lower side of the side wall surface of the pocket. Moreover, at least one connection part and several pillar parts are separable among cage | basket segments.

  Since the main shaft support bearing 75 supports the main shaft 76 that fixes the blade 77 that receives large wind force at one end, a large load is applied. Then, it is necessary to make the main shaft support bearing 75 itself large. Here, when the cage is a split-type cage segment, the workability at the time of assembly is improved by adopting the configuration as described above. Therefore, the main shaft support structure of the wind power generator has good productivity. It becomes.

  In the above embodiment, as the fixing means, the convex portion provided in the column portion and the concave portion provided in the connecting portion are fitted and engaged and fixed, but not limited thereto, You may decide to fix by using a screw | thread, a volt | bolt, etc. as a fixing means, and fastening a pillar part and a connection part. Further, a concave portion may be provided on the column portion side, and a convex portion may be provided on the connecting portion side. Moreover, you may decide to fix a some pillar part and a connection part among several pillar parts contained in a holder | retainer segment. Further, the concavo-convex portion may adopt a snap-fitting configuration so as to restrict the movement of the connecting portion in the roller length direction.

  In the above embodiment, the roller stopper having a shape along the rolling surface of the tapered roller is provided. However, the present invention is not limited to this. Various shapes of roller stoppers such as a shape divided in the length direction can be applied. Furthermore, it is good also as a structure by which a roller stopper is provided only in one side among the both side wall surfaces which face. Further, the inner diameter side roller stopper may be provided on one side wall surface, and the outer diameter side roller stopper may be provided on the other side wall surface.

  In the above-described embodiment, the coupling portion of the cage segment may protrude in the circumferential direction from the outermost column portion. Furthermore, you may make it arrange | position a tapered roller between adjacent cage | basket segments.

  In the above embodiment, the tapered roller bearing includes a spacer. However, the present invention is not limited to this, and the present invention can be applied to a tapered roller bearing of a type that does not include such a spacer. Also, the shape of the spacer may be, for example, a substantially rectangular parallelepiped shape or a shape in which the central portion bulges in the circumferential direction.

  In the above embodiment, the cage segment has four pockets for accommodating the rollers. However, the present invention is not limited to this, and the cage segment has less than four pockets or five or more pockets. May be.

  In the above embodiment, the tapered roller is used as the roller provided in the roller bearing. However, the present invention is not limited to this, and a cylindrical roller, a needle roller, a rod roller, 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 roller bearing according to the present invention is effectively used for a roller bearing that requires good assemblability.

  Further, the cage segment according to the present invention is effectively used when it is provided in a roller bearing that requires good assemblability.

  The main shaft support structure for a wind power generator according to the present invention can also be effectively used for a main shaft support structure for a wind power generator that requires good productivity.

It is a figure which shows the holder | retainer segment of the state which isolate | separated one connection part from the several pillar part. It is a figure which shows the holder | retainer segment contained in the tapered roller bearing which concerns on one Embodiment of this invention. FIG. 3 is a cross-sectional view of the cage segment shown in FIG. 2 as seen from the direction indicated by arrow III-III in FIG. 2. It is a figure which shows the holder | retainer segment of the state which both the connection parts isolate | separated from the several pillar part. It is a figure which shows the spacer contained in a tapered roller bearing. It is a schematic sectional drawing of a tapered roller bearing at the time of arranging a plurality of cage segments and spacers in the circumferential direction. It is an expanded sectional view which shows the adjacent retainer segment. It is an expanded sectional view at the time of arrange | positioning a spacer between the 1st retainer segment and the last retainer segment. It is a figure which shows an example of the main shaft support structure of the wind power generator using the tapered roller bearing which concerns on this invention. FIG. 10 is a schematic side view of the main shaft support structure of the wind power generator shown in FIG. 9. It is a perspective view of the retainer segment in the past. It is sectional drawing at the time of cut | disconnecting the holder | retainer segment shown in FIG. 11 in the plane containing a pillar part and orthogonal to an axis | shaft.

Explanation of symbols

  11a, 11b, 11c, 11d, 11e Cage segment, 12a, 12b, 12c, 12d, 34 Tapered roller, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h, 35 pocket, 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h, 14i, 14j, 14k Column part, 15a, 15b, 15c, 15d Connecting part, 16a, 16b, 16c, 29a, 29b End face, 17a, 17b, 17c Convex part, 18a, 18b , 18c Recess, 19a, 19b, 19c, 27a, 27b End, 20a, 20b, 20c surface, 22 PCD, 23 Side wall surface, 24 Inner diameter side roller stopper, 25 Outer diameter roller stopper, 26 Spacer, 28 Central part, 31 tapered roller bearing, 32 outer ring, 33 inner ring, 39 clearance, 40 last clearance, 7 Support base, 71 slewing rim bearing, 72 nacelle 73 casing, 74 a bearing housing, 75 main shaft support bearing, 76 spindle, 77 blade, 78 gearbox, 79 generator, 80 swing motor, 81 speed reducer.

Claims (6)

Outer ring,
Inner ring,
A plurality of rollers disposed between the outer ring and the inner ring;
A plurality of pillars extending in a direction along the axis so as to form pockets for holding the rollers, and a pair of connecting parts extending in the circumferential direction so as to connect the plurality of pillars; the outer ring and the inner ring A plurality of cage segments arranged in series in the circumferential direction between the roller bearings,
The upper side and the lower side of the side wall surface of the pocket are provided with roller stoppers that prevent the rollers held in the pocket from falling off,
Of the cage segments, at least one of the connecting portions and the plurality of pillar portions are separable roller bearings. The roller bearing according to claim 1, wherein both of the connecting portions and the plurality of column portions are separable. The roller bearing according to claim 1, further comprising a fixing unit that fixes the coupling portion and the column portion. The roller bearing according to claim 3, wherein the fixing means is an uneven portion that is provided at a portion where the connecting portion and the column portion abut and engage with each other. A cage segment divided by a dividing line extending in a direction along the axis so as to have one annular cage having at least one pocket for accommodating rollers;
A plurality of pillars extending in a direction along the axis so as to form a pocket for holding the roller;
A pair of connecting portions extending in the circumferential direction so as to connect the plurality of pillar portions;
The upper side and the lower side of the side wall surface of the pocket are provided with roller stoppers that prevent the rollers held in the pocket from falling off,
Of the cage segments, at least one of the connecting portion and the column portion is separable. A blade that receives wind,
One end of which is fixed to the blade and rotates with the blade;
A main shaft support structure of a wind power generator having a roller bearing incorporated in a fixing member and rotatably supporting the main shaft,
The roller bearing includes an outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, a plurality of column portions extending in a direction along the axis so as to form a pocket for holding the roller, and A plurality of retainer segments, which have a connecting portion extending in the circumferential direction so as to connect the plurality of pillar portions, and are arranged sequentially in the circumferential direction between the outer ring and the inner ring;
The upper side and the lower side of the side wall surface of the pocket are provided with roller stoppers that prevent the rollers held in the pocket from falling off,
A main shaft support structure for a wind power generator, wherein at least one of the connecting portion and the pillar portion of the cage segments is separable.

Images