JP2008163999A - Conical roller bearing, conical roller bearing incorporating method and main spindle supporting structure of wind power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conical roller bearing having an excellent incorporatedness. <P>SOLUTION: A double-row conical roller bearing 41 includes: conical rollers 44a, 44b; an outer ring 42 containing small collars 49a, 49b at ends on small-diameter sides of the conical rollers 44a, 44b; inner rings 43a, 43b containing no small collar at ends on small diameter sides of the conical rollers 44a, 44b; at least one pocket for holding the conical rollers 44a, 44b; and a plurality of retainer segments 45a, 45b divided circumferentially. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tapered roller bearing, a method for incorporating a tapered roller bearing, and a main shaft support structure for a wind power generator, and more particularly, to a large tapered roller bearing, a method for incorporating the same, and a main shaft support structure for a large wind power generator.

  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. 20 is a perspective view showing a cage segment which is a split type cage disclosed in Patent Document 1. FIG. Referring to FIG. 20, the 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.

FIG. 21 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. 20 and 21. 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

  In general, when a large tapered roller bearing is incorporated into a rotary shaft extending in the vertical direction, first, the end surface on the large diameter side of the inner ring is disposed downward, and the tapered roller and the cage are disposed on the raceway surface of the inner ring. . And the inner ring | wheel with which the tapered roller and the holder | retainer are arrange | positioned is lifted with a crane etc., and it incorporates in a rotating shaft.

  Here, when the small-diameter side end face of the inner ring is suspended downward, the tapered rollers and the cage are dropped from the inner ring. In such a case, about the cage | basket comprised from one cyclic | annular component, falling off of a tapered roller etc. can be prevented by connecting and fixing an inner ring and a cage | basket. However, the cage segments described above are divided in the circumferential direction, and each is an independent member. Then, in order to prevent the tapered rollers and the like from falling off, the inner ring and each cage segment must be connected and fixed, resulting in great labor. As a result, it becomes difficult to incorporate the inner ring in which the tapered rollers and the cage are arranged into the rotating shaft, and the productivity of the tapered roller bearing is deteriorated.

  An object of the present invention is to provide a tapered roller bearing with good assemblability.

  Another object of the present invention is to provide a method for assembling a tapered roller bearing with good assemblability.

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

  The tapered roller bearing according to the present invention includes a tapered roller, an outer ring having a small flange at a small diameter side end portion of the tapered roller, an inner ring having no small flange at a small diameter side end portion of the tapered roller, and a pocket for holding the tapered roller. And a plurality of cage segments divided in the circumferential direction.

  With this configuration, when the tapered roller bearing is installed, when the tapered roller and the cage segment are disposed on the outer ring, the tapered roller is arranged so that the small end surface of the tapered roller is in contact with the small ring of the outer ring. Can be arranged. Then, the tapered roller and the cage segment can be arranged on the outer ring without breaking the arrangement of the tapered roller. Further, when the inner ring is assembled from above the tapered roller disposed on the outer ring, the inner ring does not have a small flange at the small diameter side end portion of the tapered roller, so that the inner ring and the tapered roller do not interfere with each other. Therefore, such a tapered roller bearing has good assemblability.

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

  Preferably, the inner ring has a large flange at the end portion on the large diameter side of the tapered roller. Here, the distance in the roller length direction between the guide surface of the small collar of the outer ring and the guide surface of the large collar is longer than the roller length of the tapered roller. By doing so, the rolling surfaces of the tapered rollers come into contact with the raceways of the inner ring and the outer ring, so that a load can be appropriately received.

  More preferably, the outer diameter size of the outer diameter surface of the end portion on the small diameter side of the inner ring decreases toward the tip. By doing so, when the inner ring is assembled, the interference between the inner ring and the tapered roller can be prevented more reliably, and the inner ring can be smoothly assembled.

  More preferably, a chamfer is provided at a corner of the outer diameter surface of the inner diameter of the inner ring. By doing so, the incorporation property can be further improved.

  In another aspect of the present invention, a tapered roller bearing is assembled by a tapered roller, an outer ring having a small flange at a small diameter side end of the tapered roller, and an inner ring having no small flange at a small diameter side end of the tapered roller. And a method of assembling a tapered roller bearing comprising at least one pocket for holding the tapered roller and a plurality of cage segments divided in the circumferential direction. Here, the tapered roller bearing is assembled in such a way that the raceway surface of the outer ring and the rolling surface of the tapered roller are in contact with each other, and the tapered ring and the cage segment are attached to the outer ring so that the small ring of the outer ring and the small end surface of the tapered roller are in contact with each other. Deploy. Then, the inner ring is incorporated into the rotating shaft from above so that the raceway surface of the inner ring and the rolling surface of the tapered roller come into contact with each other.

  According to such a method for assembling the tapered roller bearing, the tapered roller and the cage segment can be arranged without breaking the arrangement of the tapered roller by the small ring of the outer ring. In addition, since the inner ring is not provided with a gavel, the inner ring and the tapered roller do not interfere when the inner ring is assembled from above. Therefore, the installability is improved.

  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 end that is fixed to the blade, and that rotates together with the blade, and is incorporated in the housing so that the main shaft can rotate freely. A main shaft support structure of a wind power generator having a tapered roller bearing to be supported. Here, the tapered roller bearing includes a tapered roller, an outer ring having a small flange at the small diameter side end portion of the tapered roller, an inner ring having no small flange at the small diameter side end portion of the tapered roller, and a pocket for holding the tapered roller. And a plurality of cage segments that are divided in the circumferential direction.

  Since the main shaft support structure of such a wind power generator includes a tapered roller bearing with good assemblability, productivity is good.

  According to the present invention, when the tapered roller bearing is installed, when the tapered roller and the cage segment are disposed on the outer ring, the tapered roller is disposed so that the small end surface of the tapered roller is brought into contact with the small collar of the outer ring. can do. Then, the tapered roller and the cage segment can be arranged on the outer ring without breaking the arrangement of the tapered roller. Further, when the inner ring is assembled from above the tapered roller disposed on the outer ring, the inner ring does not have a small flange at the small diameter side end portion of the tapered roller, so that the inner ring and the tapered roller do not interfere with each other. Therefore, such a tapered roller bearing has good assemblability.

  Further, according to such a method for incorporating a tapered roller bearing, the tapered roller and the cage segment can be arranged without breaking the arrangement of the tapered roller by the small ring of the outer ring. In addition, since the inner ring is not provided with a gavel, the inner ring and the tapered roller do not interfere when the inner ring is assembled from above. Therefore, the installability is improved.

  Moreover, since the main shaft support structure of such a wind power generator includes a tapered roller bearing with good assemblability, productivity is good.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view showing a cage segment 11a included in a double row tapered roller bearing according to an embodiment of the present invention. 3 is a cross-sectional view of the cage segment 11a shown in FIG. 2 taken along a plane that includes the line III-III in FIG. 2 and is perpendicular to the axis. FIG. 4 is a cross-sectional view of the cage segment 11a shown in FIG. 2 cut along a plane that passes through the center of the column 14a and is orthogonal to the circumferential direction. From the viewpoint of easy understanding, in FIGS. 3 and 4, the plurality of tapered rollers 12a, 12b, 12c 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, FIG. 3 and FIG. 4, first, the structure of the cage segment 11a included in the tapered roller bearing will be described. 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 includes four column portions 14a, 14b, 14c, and 14d extending in the direction along the axis so as to form pockets 13a, 13b, and 13c that hold the tapered rollers 12a, 12b, and 12c. A pair of connecting portions 15a and 15b extending in the circumferential direction so as to connect the four column portions 14a to 14d, and a pair of protruding portions 16a and 16b positioned in both ends in the axial direction and protruding in the circumferential direction. Including. In addition, an axis here refers to rotating shafts, such as a tapered roller 12a.

  The pair of connecting portions 15a and 15b and the pair of protrusions 16a and 16b are connected in the circumferential direction to form one annular cage when the plurality of cage segments 11a are incorporated in the tapered roller bearing. , Has a predetermined radius of curvature in the circumferential direction. Of the pair of connecting portions 15a and 15b and the pair of protruding portions 16a and 16b, the connecting portion 15a located on the small diameter side of the tapered rollers 12a to 12c and the curvature radius of the protruding portion 16a are larger on the large diameter side of the tapered rollers 12a to 12c. It is comprised smaller than the curvature radius of the connection part 15b and protrusion 16b which are located in.

  The pair of protrusions 16a and 16b accommodate the tapered rollers between the cage segment 11a and the other cage segment when the other cage segments and the end faces 21a and 21b are arranged in contact with each other. Form a pocket.

  Guide surfaces 17a, 17b, 17c, 17d, 18a, 18b, 18c, and 18d for guiding the rollers are provided on the inner and outer diameter sides of the column portions 14a to 14d located on both sides in the circumferential direction of the pockets 13a to 13c. ing. With this configuration, the cage segment serves as a roller guide, and movement of the cage segment 11a in the radial direction is restricted. On the outer diameter side and the inner diameter side of the column portions 14a to 14d, oil grooves 19 and 20 penetrating in the circumferential direction are provided in a shape recessed inward or outward in the radial direction at a central portion in the axial direction. The oil grooves 19 and 20 improve the circulation of the lubricant.

  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 perspective view of 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. In addition, oil grooves 30a and 30b penetrating in the circumferential direction are provided on the inner diameter surface side and the outer diameter surface side of the central portion 28.

  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 seen 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 shape 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 tapered roller 34, a plurality of cage segments 11 a to 11 d, and a spacer 26. The configuration of the outer ring 32 and the inner ring 33 will be described later. 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, between the two adjacent cage segments 11a, 11b, etc., the tapered roller 34 is disposed in the pocket 35a to be formed, except between the first cage segment 11a and the last cage segment 11d. Is done.

  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. 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. The last gap is the first cage segment 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. 11a and the maximum clearance between the first retainer segment 11a and the spacer 26 disposed between the last retainer segment 11d.

  The first cage segment refers to the cage segment that is placed first when the cage segments are sequentially arranged in the circumferential direction, and the last cage segment refers to the adjacent cage segment. The cage segments are arranged last when they are brought into contact with each other and sequentially arranged in the circumferential direction. When arranged in this manner, the gap generated between the first cage segment and the last cage segment is adjusted by the spacer so as to have an appropriate gap size. The spacer does not have a pocket for accommodating the roller, and is different from a cage segment having at least one pocket for accommodating the roller.

  Next, in the case where the above-described tapered roller bearing 31 is a double-row tapered roller bearing, a method for incorporating the double-row tapered roller bearing when the double-row tapered roller bearing is incorporated into the rotating shaft will be described.

  FIG. 1 is a cross-sectional view showing a double row tapered roller bearing according to an embodiment of the present invention. FIG. 9 is an enlarged cross-sectional view of a portion indicated by IX in FIG. Referring to FIGS. 1 and 9, double row tapered roller bearing 41 includes an outer ring 42, two inner rings 43a and 43b arranged such that small-diameter side end portions 48a and 48b face each other, outer ring 42, and A plurality of tapered rollers 44a, 44b disposed between the inner rings 43a, 43b, and the above-described plurality of cage segments 45a, 45b and spacers (not shown) holding the respective tapered rollers 44a, 44b, An inner ring spacer 46 is provided between the inner ring 43a and the inner ring 43b.

  The outer ring 42 is provided with two raceway surfaces 51a and 51b. The inner rings 43a and 43b have raceway surfaces 51c and 51d, respectively. The tapered roller 44a is disposed between the outer ring 42 and the inner ring 43a so that the rolling surface 52a abuts on the raceway surfaces 51a and 51c. Similarly, the tapered roller 44b is disposed between the outer ring 42 and the inner ring 43b so that the rolling surface 52b contacts the raceway surfaces 51b and 51d.

  Here, the outer ring 42 has small flanges 49a and 49b at the small diameter side ends of the tapered rollers 44a and 44b. When the double row tapered roller bearing 41 is assembled, the guide surfaces 50a and 50b of the small flanges 49a and 49b can contact the small end surfaces 53a and 53b of the tapered rollers 44a and 44b, respectively. In addition, it is preferable that the guide surface 50a is substantially perpendicular to the raceway surface 51a, or is substantially parallel to the small end surface 53a in a state where the tapered rollers 44a are disposed. Similarly, the guide surface 50b is preferably substantially perpendicular to the raceway surface 51b or substantially parallel to the small end surface 53b in a state where the tapered rollers 44b are disposed.

The inner ring 43a has a large flange 55a at the large-diameter side end of the tapered roller 44a, but does not have a small flange at the small-diameter side end 48a. That is, the large ring 55a is provided at the large diameter end of the inner ring 43a, but the small ring is not provided at the small diameter end 48a of the inner ring 43a. Maximum outer diameter _{L 1} of the small diameter side end portion 48a of the inner ring 43a is less time inscribed circle diameter _{L 2} of the tapered roller 44a (see FIG. 9). Similarly to the inner ring 43a, the inner ring 43b has a large flange 55b at the large-diameter end of the tapered roller 44b, but does not have a small flange at the small-diameter end 48b.

  FIG. 10 is a flowchart showing an outline of a procedure for incorporating the double row tapered roller bearing 41 shown in FIGS. 1 and 9 into the rotating shaft 47. Moreover, FIGS. 11-15 is sectional drawing which shows arrangement | positioning of each member in each process. With reference to FIGS. 1 and 9 to 15, a method for incorporating the double row tapered roller bearing 41 having the above-described configuration into the rotating shaft 47 will be described.

  First, the large-diameter side end surface 56b of one inner ring 43b faces downward and is incorporated into the rotating shaft 47 (FIGS. 10A and 11). After that, the raceway surface 51d of the inner ring 43b and the rolling surface 52b of one of the tapered rollers 44b abut, and the guide surface 50d of the large collar 55b of the inner ring 43b abuts on the large end surface 54b of the tapered roller 44b. 44b and the cage segment 45b are arranged (FIG. 10B, FIG. 12). Regarding the arrangement of the tapered rollers 44b and the cage segments 45b, as described above, the plurality of cage segments 45b are arranged on the raceway surface 51d of the inner ring 43b so as to be connected in the circumferential direction. Further, a spacer is arranged between the first cage segment 45b and the last cage segment 45b. In this case, since the large end surface 54b of the tapered roller 44b is disposed so as to contact the guide surface 50d of the large collar 55b of the inner ring 43b, the large end surface 54b is caught by the large collar 55b. The arrangement of the cage segments 45b does not collapse.

  Next, the inner ring spacer 46 is assembled to the rotary shaft 47 from above so as to come into contact with the small diameter side end 48b of the inner ring 43b (FIGS. 10C and 13).

  Thereafter, the outer ring 42 is arranged from above so that the rolling surface 52b of the tapered roller 44b contacts the raceway surface 51b of the outer ring 42, and the guide surface 50b of the small collar 49b contacts the small end surface 53b of the tapered roller 44b. (FIG. 10D, FIG. 14). In this case, since the small flange 49b is caught on the small end surface 53b of the tapered roller 44b, the arrangement of the outer ring 42 does not collapse.

  Next, the tapered roller 44a so that the raceway surface 51a of the outer ring 42 and the rolling surface 52a of the other tapered roller 44a contact each other, and the guide surface 50a of the small collar 49a and the small end surface 53a of the tapered roller 44a contact each other. And the cage segment 45a is disposed (FIGS. 10E and 15). Also in this case, similarly to the above, the cage segments 45a and the like are arranged so as to be connected in the circumferential direction. Also in this case, the small end surface 53a of the tapered roller 44a is caught by the small collar 49a, and the arrangement of the tapered roller 44a and the cage segment 45a is not broken.

Thereafter, the inner ring 43a is incorporated into the rotary shaft 47 from above so that the large-diameter side end face 56a of the other inner ring 43a faces upward and the rolling surface 52a of the tapered roller 44a and the raceway surface 51c of the inner ring 43a contact each other ( FIG. 10 (F), FIG. 1 and FIG. 9). In this case, since the small diameter side end portion 48a of the inner ring 43a is not provided with a small flange, the tapered roller 44a and the inner ring 43a do not interfere with each other. The maximum outer diameter _{L 1} of the small diameter side end portion 48a of the inner ring 43a is because it is less time inscribed circle diameter _{L 2} of the tapered rollers 44a, smaller diameter end 48a of the inner ring 43a is tapered rollers 44a interference The inner ring 43a can be incorporated into the rotating shaft 47 without doing so.

  In the assembled state, the small end surfaces 53a and 53b of the tapered rollers 44a and 44b are in contact with the guide surfaces 50a and 50b of the small flanges 49a and 49b, but a load is applied to the double row tapered roller bearing 41. Then, an induced thrust load is generated, and the large end surfaces 54a and 54b of the tapered rollers 44a and 44b come into contact with the guide surfaces 50c and 50d of the large flanges 55a and 55b.

  By comprising in this way, the incorporating property of the double row tapered roller bearing 41 can be made favorable. That is, according to such a method for assembling the double row tapered roller bearing 41, the tapered roller 44a and the cage segment 45a can be arranged without breaking the arrangement by the small collar 49a provided on the outer ring 42. . Further, since the small diameter side end portion 48a of the inner ring 43a is not provided with a small flange, the inner ring 43a and the tapered roller 44a do not interfere when the inner ring 43a is assembled. Therefore, the installability is improved.

In a state that incorporates a double row tapered roller bearing 41, the distance _{L 3} of the roller length direction of the guide surface 50a of the guide surface 50c and the small rib 49a of the large flange 55a of the inner ring 43a is roller length of the tapered roller 44a It is preferable to make it longer than the length L ₄ (see FIG. 9). By doing so, the rolling contact surface 52a of the tapered roller 44a and the raceway surfaces 51a and 51c of the outer ring 42 and the inner ring 43a come into proper contact with each other, so that a load can be appropriately received by the tapered roller 44a. It is preferable that the relationship between the distance in the roller length direction between the guide surface 50d of the large collar 55b and the guide surface 50b of the small collar 49b and the roller length of the tapered roller 44b are the same.

  Moreover, it is preferable that the outer diameter size of the outer diameter surface of the inner ring at the small diameter side end portion decreases toward the tip. For example, in the cross section passing through the rotation center axis, it is preferable that the angle formed by the line indicating the outer diameter surface constituting the small diameter side end portion and the rotation center axis is greater than 0 °. FIG. 16 is an enlarged cross-sectional view showing the vicinity of the small-diameter side end portion of the inner ring included in the double-row tapered roller bearing. The section shown in FIG. 16 passes through the rotation center axis. In FIG. 16, it is preferable that an angle θ formed by a line 57a indicating an outer diameter surface constituting the small-diameter side end portion 48c and a line 57b parallel to the rotation center axis of the rotation shaft 47 is larger than 0 °. In this way, the outer diameter of the outer diameter surface of the small diameter side end 48c of the inner ring 43c can be reduced toward the tip. Therefore, when the inner ring 43c is incorporated into the rotating shaft 47, the inner ring 43c can be smoothly incorporated. The outer diameter surface may be composed of a plurality of flat surfaces and curved surfaces, and the outer diameter of the outer diameter surface may be reduced toward the tip.

  Further, a chamfer may be provided at a corner portion of the outer diameter surface of the end portion on the small diameter side of the inner ring. FIG. 17 is an enlarged sectional view showing a part of the inner ring in this case, and corresponds to FIG. Referring to FIG. 17, a corner 58 of the outer diameter surface of the small diameter side end portion 48d of the inner ring 43d is provided with a chamfer having an R-shaped cross section. By doing so, when the inner ring 43d is incorporated into the rotating shaft 47, the handleability is improved and the assemblability is improved. The chamfering may be C chamfering.

  18 and 19 show an example of a main shaft support structure of a wind power generator to which a tapered roller bearing according to an embodiment of the present invention is applied as a main shaft support bearing 75. 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.

  A main shaft support bearing 75 incorporated in the bearing housing 74 is a tapered roller bearing according to an embodiment of the present invention, and includes a tapered roller, an outer ring having a small flange at a small diameter side end of the tapered roller, and a tapered roller. An inner ring that does not have a small flange at the small diameter side end portion, and a plurality of cage segments that have at least one pocket that holds the tapered rollers and are divided in the circumferential direction.

  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, and the bearing itself needs to be large. Here, when the cage is a split type and configured as described above, the tapered roller bearing can be easily incorporated into the main shaft 76. Therefore, the productivity of the main shaft support structure of the wind power generator can be improved.

  In addition, in said embodiment, although the case where it used as a double row tapered roller bearing was demonstrated, it is applied not only to this but the case where it uses as a single row tapered roller bearing. Further, the tapered roller bearing includes a spacer, but 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. In addition, the cage segment included in the tapered roller bearing has a shape divided by a dividing line extending in the direction along the axis. However, the cage segment is not limited to this, and is applied to various shapes of cage segments divided in the circumferential direction. The

  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.

  Further, the tapered roller bearing according to the present invention is effectively used when good assemblability is required.

  Moreover, the method for assembling the tapered roller bearing according to the present invention is effectively used when good assemblability is required.

  The main shaft support structure for a wind power generator according to the present invention is effectively used for the main shaft support structure for a large-scale wind power generator.

It is sectional drawing which shows the double row tapered roller bearing which concerns on one Embodiment of this invention. It is a perspective view of a cage segment included in a double row tapered roller bearing according to an embodiment of the present invention. It is sectional drawing at the time of cut | disconnecting the holder | retainer segment shown in FIG. 2 by the plane orthogonal to an axis | shaft including line III-III in FIG. It is sectional drawing at the time of cut | disconnecting the holder | retainer segment shown in FIG. 2 with the plane which passes along the center of a pillar part and is orthogonal to the circumferential direction. It is a perspective view 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 an expanded sectional view which shows a part of double row tapered roller bearing shown in FIG. It is a flowchart which shows the outline of the incorporating method of the double row tapered roller bearing shown in FIG. It is sectional drawing which shows the state which incorporated one inner ring | wheel in the rotating shaft. It is sectional drawing which shows the state which has arrange | positioned one tapered roller and a cage | basket segment. It is sectional drawing which shows the state which has arrange | positioned the inner ring spacer. It is sectional drawing which shows the state which has arrange | positioned the outer ring | wheel. It is sectional drawing which shows the state which has arrange | positioned the other tapered roller and the cage | basket segment. It is an expanded sectional view which shows a part of inner ring contained in the double row tapered roller bearing which concerns on other embodiment of this invention. It is an expanded sectional view showing a part of inner ring included in a double row tapered roller bearing according to still another embodiment of the present invention. 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. 19 is a schematic side view of the main shaft support structure of the wind power generator shown in FIG. 18. It is a perspective view of the retainer segment in the past. It is sectional drawing at the time of cut | disconnecting the retainer segment shown in FIG. 20 to radial direction.

Explanation of symbols

  11a, 11b, 11c, 11d, 45a, 45b Cage segment, 12a, 12b, 12c, 34, 44a, 44b Tapered roller, 13a, 13b, 13c, 35a Pocket, 14a, 14b, 14c, 14d Pillar part, 15a, 15b Connecting part, 16a, 16b Protruding part, 17a, 17b, 17c, 17d, 18a, 18b, 18c, 18d, 50a, 50b, 50c, 50d Guide surface, 19, 20, 30a, 30b Oil groove, 21a, 21b End face , 22 PCD, 26 spacer, 27a, 27b end, 28 center, 31 tapered roller bearing, 32, 42 outer ring, 33, 43a, 43b, 43c, 43d inner ring, 39 clearance, 40 last clearance, 41 double row cone Roller bearing, 46 Inner ring spacer, 47 Rotating shaft, 48a, 48b, 48c, 48d Small diameter side end 49a, 49b small rod, 51a, 51b, 51c, 51d raceway surface, 52a, 52b rolling surface, 53a, 53b small end surface, 54a, 54b large end surface, 55a, 55b large rod, 56a, 56b large diameter side end surface, 57a 57b line, 58 corners, 70 support base, 71 swivel bearing, 72 nacelle, 73 casing, 74 bearing housing, 75 spindle support bearing, 76 spindle, 77 blade, 78 speed increaser, 79 generator, 80 for turning Motor, 81 reducer.

Claims (6)

With tapered rollers,
An outer ring having a small flange on the small diameter side end of the tapered roller;
An inner ring that does not have a small flange at the small diameter side end of the tapered roller;
A tapered roller bearing comprising: a plurality of cage segments having at least one pocket for holding the tapered roller and divided in a circumferential direction. The inner ring has a large flange at the large diameter side end of the tapered roller,
2. The tapered roller bearing according to claim 1, wherein a distance in a roller length direction between the guide surface of the small collar of the outer ring and the guide surface of the large collar is longer than the roller length of the tapered roller. The tapered roller bearing according to claim 1 or 2, wherein an outer diameter dimension of an outer diameter surface of a small diameter side end portion of the inner ring decreases toward the tip. The tapered roller bearing according to any one of claims 1 to 3, wherein a chamfer is provided at a corner portion of an outer diameter surface of a small diameter side end portion of the inner ring. At least one tapered roller, an outer ring having a small flange at the small diameter side end of the tapered roller, an inner ring having no small flange at the small diameter side end of the tapered roller, and a pocket for holding the tapered roller A method of assembling a tapered roller bearing comprising a plurality of cage segments divided in the circumferential direction,
The tapered roller and the cage segment are arranged on the outer ring so that the raceway surface of the outer ring and the rolling surface of the tapered roller are in contact with each other, and a small edge surface of the outer ring and a small end surface of the tapered roller are in contact with each other.
A method of assembling a tapered roller bearing, wherein the inner ring is incorporated into a rotating shaft from above so that the raceway surface of the inner ring and the rolling surface of the tapered roller abut. 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, which is incorporated in a housing and has a tapered roller bearing that rotatably supports the main shaft,
The tapered roller bearing includes a tapered roller, an outer ring having a small flange at a small diameter side end portion of the tapered roller, an inner ring having no small flange at a small diameter side end portion of the tapered roller, and a pocket for holding the tapered roller. And a plurality of retainer segments divided in the circumferential direction.

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