JP4573791B2 - Roller bearing and main shaft support structure of wind power generator - Google Patents

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. 12 is a perspective view showing a cage segment which is a split type cage disclosed in Patent Document 1. FIG. Referring to FIG. 12, the cage segment 101a includes a plurality of pillar portions 103a, 103b, 103c, 103d, and 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. 13 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. 12 and 13. The roller bearing 111 holds the outer ring 112, the inner ring 113, the plurality of rollers 114, and the 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 in the roller bearing 111 to form one annular cage included in the roller bearing 111.
European Patent Publication EP1408248A2

  According to Patent Document 1, the cage segment 101a maintains a distance from the outer ring 112 and the inner ring 113 by the protruding portion 106a provided on the outer diameter surface of the pillar portions 103a to 103e and the protruding portion 106b provided on the inner diameter surface. ing. That is, the cage segment 101a is a raceway guide guided by the outer ring 112 or the inner ring 113.

  As described above, the cage segments 101a, 101b, 101c and the like are independent and are not connected in the circumferential direction. Therefore, when the cage segment 101a or the like is a raceway guide, the outer ring 112 and the inner ring It moves easily between 113 and its position becomes unstable in the radial direction.

  Specifically, for example, when the roller bearing 111 having the above-described configuration is used while being disposed sideways, when the cage segment 101a is in the top position, the cage segment 101a moves downward, The outer ring surface 115 of the inner ring 113 located at the lower part and the protruding part 106b provided on the inner diameter surface of the pillars 103a to 103e come into contact with each other, thereby providing an inner ring guide guided by the inner ring 113. On the other hand, when the cage segment 101a is at the ground position, the cage segment 101a moves downward, and the protrusion provided on the inner diameter surface 116 of the outer ring 112 and the outer diameter surfaces of the pillar portions 103a to 103e located at the lower portion. The outer ring guide guided by the outer ring 112 comes into contact with the portion 106a.

  Thus, if the cage segment 101a easily moves in the radial direction and becomes an inner ring guide or an outer ring guide depending on the position in the roller bearing 111, the radial position of the cage segment 101a is unstable. Therefore, there is a risk that abnormal noise may be generated when the outer ring 112 or the inner ring 113 is contacted, or the cage segment 101a may be damaged.

  Here, when the cage segment 101a is a roller guide, it is possible to reduce the generation of noise due to contact with the outer ring 112 and the inner ring 113 and the breakage of the cage segment 101a.

  However, even when the cage segment 101a is a roller guide, if the corner portion of the guide surface of the cage segment 101a comes into contact, the corner portion of the guide surface is damaged, or friction or wear with the corner portion is caused. This may cause torque to increase or generate heat.

  This will be described with reference to FIG. FIG. 14 is a cross-sectional view of a cage segment that is a roller guide, in which a pocket peripheral portion that holds a roller is cut along a plane perpendicular to the axial direction. Referring to FIG. 14, guide surfaces 124 for guiding rollers 122 are provided on both side wall surfaces of pocket 123 of cage 121. The guide surface 124 has a circular arc cross section, and the center of curvature thereof is the same as the center of curvature Q1 of the roller 122. That is, the arc of the roller 122 and the arc of the guide surface 124 are formed concentrically. The curvature radius T2 of the guide surface 124 is configured to be slightly larger than the curvature radius T1 of the rollers 122.

  With such a configuration, for example, when the roller 122 starts to roll from the above-described top position or ground position, the roller 122 has a boundary portion between the guide surface 124 and the inner diameter surface 126a or the outer diameter surface 126b. The cage 121 is guided by contact at the corners 125a and 125b. If it does so, there exists a possibility that the corner | angular parts 125a and 125b may be damaged, or the corner | angular parts 125a and 125b may cause the increase in torque and heat_generation | fever by friction with 122.

  Here, as shown in FIG. 15, the radius of curvature T4 of the arc constituting the guide surface 134 provided on the side wall surface of the pocket 133 of the cage 131 is made larger than the radius of curvature T3 of the roller 132, and its curvature center Q3. In the above-described state, when the cage 131 is guided, the corners 135a, 135b and 132 are brought into contact with each other by setting a position different from the curvature center Q2 of the roller 132 on the PCD 136. Therefore, the corners 135a and 135b may be damaged, or the torque may increase due to friction with the corners 135a and 135b and 132, or heat may be generated.

  An object of the present invention is to provide a roller bearing capable of smoothly rolling a roller and reducing the risk of breakage of a cage segment.

  Another object of the present invention is to provide a cage segment that can smoothly roll a roller and is less likely to be damaged.

  Still another object of the present invention is to provide a main shaft support structure for a wind power generator that achieves a long service life.

  The 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, and a plurality extending in a direction along the axis so as to form first and second pockets for holding the rollers. And a plurality of retainer segments that are connected to each other in order in the circumferential direction between the outer ring and the inner ring. Of the side wall surfaces on both sides of the first pocket, an inner diameter side guide surface for guiding the rollers held in the first pocket is provided on the inner diameter side of the roller pitch circle diameter. Of the side wall surfaces on both sides of the second pocket, an outer diameter side guide surface for guiding the rollers held in the second pocket is provided on the outer diameter side of the roller pitch circle diameter. Here, the inner diameter side guide surface and the outer diameter side guide surface are in contact with each other through two lines.

  With this configuration, the cage segment serves as a roller guide, and even if the cage segment tries to move to the outer diameter side, the roller held in the first pocket and the inner diameter side guide surface are in contact with each other by two lines. To do. Even if the cage segment is about to move toward the inner diameter side, the roller held in the second pocket and the outer diameter side guide surface come into contact with each other through two lines. In this way, the inner diameter side guide surface and the outer diameter side guide surface are in contact with each other by two lines, and the movement of the cage segment is restricted. If it does so, the corner | angular part of an inner diameter side and an outer diameter side guide surface and the roller hold | maintained at the 1st and 2nd pocket will not contact. That is, in the above-described state, even when the cage segment is at the top position or the ground position, the corners of the inner diameter side and outer diameter side guide surfaces do not come into contact when the roller starts rolling. . Therefore, it is possible to prevent the corner portions of the inner diameter side and outer diameter side guide surfaces from being damaged, and friction, heat generation, torque increase, and the like due to contact with the corner portions. As a result, the rollers can be smoothly rolled and the risk of breakage of the cage segment can be reduced.

  Here, the two lines are the two lines or the second line forming the inner diameter side guide surface among the side wall surfaces on both sides of the first pocket when the cage segment is cut along a plane orthogonal to the axial direction. Of the side wall surfaces on both sides of the pocket, it refers to the two lines forming the outer diameter side guide surface, and does not include the corners (edges) where the guide surface intersects the outer diameter surface and the inner diameter surface of the cage segment. Is. The cage segment is a unit body obtained by dividing one annular cage by a dividing line extending in a direction along the axis so as to have first and second pockets for accommodating at least the rollers. A plurality of cage segments are connected to the roller bearing in a circumferential direction to form one annular cage. The first pocket is a pocket in which the guide surface is provided on the inner diameter side of the roller pitch circle diameter among the side wall surfaces on both sides of the pocket, and the second pocket is the side wall surface on both sides of the pocket, A pocket in which a guide surface is provided on the outer diameter side of the roller pitch circle diameter.

  Preferably, the inner diameter side and outer diameter side guide surfaces are arc-shaped in cross section, the radius of curvature of the arc is larger than the radius of curvature of the roller, and the center of curvature of the arc is the inner diameter side of the roller pitch circle diameter and It is on the outer diameter side. With this configuration, even if the guide surface is a curved surface having an arcuate cross section, the inner diameter side or outer diameter side guide surface and the rollers held in the first and second pockets are contacted by two lines. Can be made. Therefore, the rollers can be smoothly rolled, and the risk of breakage of the cage segment can be reduced.

  More preferably, a spacer is provided between the first retainer segment and the last retainer segment connected in the circumferential direction.

  In order to form a single annular cage by connecting a plurality of cage segments in the circumferential direction, an appropriate gap in the circumferential direction in consideration of thermal expansion or the like is required. However, since each cage segment is manufactured independently, each cage segment has a dimensional error in the circumferential direction. When such cage segments are arranged continuously in the circumferential direction, dimensional errors are also accumulated. Each cage segment must be manufactured with high accuracy to keep the gap dimensions within a predetermined range.

  Here, when adjusting the clearance in the circumferential direction, it is not necessary to manufacture each cage segment with high accuracy by placing a gap adjusting spacer between adjacent cage segments. Product segment productivity is improved. As a result, the productivity of the roller bearing is also improved.

  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.

  In another aspect of the present invention, the cage segment holds one annular cage divided by a dividing line extending in a direction along the axis so as to have at least first and second pockets for accommodating the rollers. A plurality of column portions extending in a direction along the axis so as to form first and second pockets for holding rollers, and a connection portion extending in the circumferential direction so as to connect the plurality of column portions. Have. Of the side wall surfaces on both sides of the first pocket, an inner diameter side guide surface for guiding the rollers held in the first pocket is provided on the inner diameter side of the roller pitch circle diameter. Of the side wall surfaces on both sides of the second pocket, an outer diameter side guide surface for guiding the rollers held in the second pocket is provided on the outer diameter side of the roller pitch circle diameter. Here, the inner diameter side guide surface and the outer diameter side guide surface are in contact with each other through two lines.

  In such a cage segment, the inner diameter side and the outer diameter side guide surface are in contact with each other by two lines, so that the corner portions of the guide surface of the cage segment are not in contact with each other. If it does so, a roller can be rolled smoothly and damage to a cage segment can be prevented.

  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, and a plurality of column portions extending in a direction along the axis so as to form first and second pockets for holding the rollers, And a plurality of retainer segments that have a connecting portion extending in the circumferential direction so as to connect the plurality of pillar portions and are sequentially arranged in the circumferential direction between the outer ring and the inner ring. Of the side wall surfaces on both sides of the first pocket, an inner diameter side guide surface for guiding the rollers held in the first pocket is provided on the inner diameter side of the roller pitch circle diameter. Of the side wall surfaces on both sides of the second pocket, an outer diameter side guide surface for guiding the rollers held in the second pocket is provided on the outer diameter side of the roller pitch circle diameter. Here, the inner diameter side guide surface and the outer diameter side guide surface are in contact with each other through two lines.

  Since the main shaft support structure of such a wind power generator includes a roller bearing that can smoothly roll the rollers and has a reduced risk of breakage of the cage segment, a long life can be realized. .

  According to the present invention, the cage segment serves as a roller guide, and even if the cage segment tries to move to the outer diameter side, the roller held in the first pocket and the inner diameter side guide surface come into contact with each other through two lines. Even if the cage segment is about to move toward the inner diameter side, the roller held in the second pocket and the outer diameter side guide surface come into contact with each other through two lines. In this way, the inner diameter side guide surface and the outer diameter side guide surface are in contact with each other by two lines, and the movement of the cage segment is restricted. If it does so, the corner | angular part of an inner diameter side and an outer diameter side guide surface and the roller hold | maintained at the 1st and 2nd pocket will not contact. Therefore, it is possible to prevent the corner portions of the inner diameter side and outer diameter side guide surfaces from being damaged, and friction, heat generation, torque increase, and the like due to contact with the corner portions. As a result, the rollers can be smoothly rolled and the risk of breakage of the cage segment can be reduced.

  Further, in such a cage segment, the inner diameter side and the outer diameter side guide surface are in contact with each other by two lines, so that the corner portion of the guide surface of the cage segment is not in contact. If it does so, a roller can be rolled smoothly and damage to a cage segment can be prevented.

  In addition, such a wind turbine main shaft support structure includes a roller bearing that can smoothly roll the rollers and that can reduce the risk of breakage of the cage segment, thereby realizing a long service life. Can do.

  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 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 taken along a plane that includes the line III-III in FIG. 2 and is perpendicular to the axis. FIG. 1 is an enlarged cross-sectional view showing the periphery of the pocket 13a in the cross section shown in FIG. 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, the tapered roller 12a held in the pocket 13a is shown by a solid line in FIG. 1, and the plurality of tapered rollers 12a, 12b held by the cage segment 11a in FIGS. 12c is indicated by a dotted line. Moreover, PCD22 is shown with a dashed-dotted line.

  With reference to FIG.1, FIG.2, FIG.3 and FIG. 4, the structure of the holder | retainer segment 11a contained in a tapered roller bearing is demonstrated 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 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.

  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.

  When the cage segment 11a is disposed with the other cage segments and the end faces 21a and 21b in contact with each other, the pair of protrusions 16a and 16b causes the cage segment 11a to be interposed between the cage segment 11a and the other cage segment. Forming a pocket for receiving the tapered roller;

  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.

  Here, among the side wall surfaces on both sides of the pocket 13a serving as the first pocket for holding the tapered roller 12a, the roller pitch circle diameter, that is, the inner diameter side guide surface whose cross section is an arc shape on the inner diameter side from the PCD22. 17a and 17b are provided. With this configuration, the cage segment 11a serves as a roller guide, and movement toward the outer diameter side is restricted by the tapered roller 12a held in the pocket 13a. The radius of curvature R1 of the arc that forms the inner diameter side guide surfaces 17a and 17b is configured to be larger than the radius of curvature R2 of the tapered roller 12a in the cross section. The center of curvature P is located on the outer diameter side of the PCD 22. Of the side wall surfaces on both sides of the pocket 13c serving as the first pocket for holding the tapered roller 12c, inner diameter side guide surfaces 17c and 17d having a circular arc cross section are also provided on the inner diameter side of the PCD 22. . Since the configuration of the inner diameter side guide surfaces 17c and 17d is the same as that of the inner diameter side guide surfaces 17a and 17b, description thereof is omitted.

  On the other hand, of the side wall surfaces on both sides of the pocket 13b serving as the second pocket for holding the tapered roller 12b, the outer diameter side guide surfaces 18b and 18c having a circular arc cross section are provided on the outer diameter side of the PCD 22. ing. The radius of curvature of the arc constituting the outer diameter side guide surfaces 18b and 18c is also configured to be larger than the radius of curvature of the tapered roller 12a in the cross section, similar to the inner diameter side guide surfaces 17a to 17d. The center of curvature is located on the inner diameter side of the PCD 22.

  With this configuration, the cage segment 11a serves as a roller guide, the movement toward the outer diameter side is restricted by the tapered rollers 12a and 12c held in the pockets 13a and 13c, and the tapered roller held in the pocket 13b. The movement toward the inner diameter side is restricted by 12b.

  In addition, outer diameter side guide surfaces 18a and 18d having the same configuration as the outer diameter side guide surfaces 18b and 18c are also provided on end surfaces on the outer side in the circumferential direction of the column portions 14a and 14d positioned on the outer side in the circumferential direction. Moreover, the above-mentioned pockets 13a to 13c are provided with guide gaps that allow slight movement of the cage segment 11a in the radial direction and the circumferential direction. Here, from the viewpoint of easy understanding, the inner radius side guide surfaces 17a to 17d and the outer radius side guide surfaces 18a to 18d have the same radius of curvature.

  Here, in the pocket 13a, the inner diameter side guide surfaces 17a and 17b and the tapered roller 12a are in contact with each other through two lines. That is, when the cage segment 11a moves to the outer diameter side, the two lines indicating the inner diameter side guide surfaces 17a and 17b come into contact with the tapered roller 12a. Then, when the cage segment 11a moves to the outer diameter side, the corner portion 23a, which is a portion where the inner diameter side guide surfaces 17a, 17b and the inner diameter surface 24a of the cage segment 11a intersect, and the tapered roller 12a come into contact with each other. There is nothing. Similarly, in the pocket 13c, the inner diameter side guide surfaces 17c, 17d and the tapered roller 12c are configured to contact each other through two lines, and the corner portion 23c and the tapered roller 12c do not contact each other.

  Similarly, in the pocket 13b which is the second pocket, even if the cage segment 11a tries to move toward the inner diameter side, the two lines indicating the outer diameter side guide surfaces 18b and 18c and the tapered roller 12b come into contact with each other. Then, when the cage segment 11a moves to the inner diameter side, the corner portion 23b, which is a portion where the outer diameter side guide surfaces 18b and 18c intersect the outer diameter surface 24b of the cage segment 11a, and the tapered roller 12b come into contact with each other. Never do.

  Therefore, when the cage segment 11a moves to the inner diameter side or the outer diameter side, the tapered rollers 12a to 12c and the corner portions 23a to 23c held in the first and second pockets do not come into contact with each other. No load is applied to the corners 23a to 23c from the rollers 12a to 12c.

  As a result, breakage of the corners 23a to 23c of the cage segment 11a can be prevented. Further, friction, heat generation, increase in torque, and the like due to contact between the corner portions 23a to 23c and the tapered rollers 12a to 12c can be prevented.

  In this case, the relationship between R1 and R2 is preferably 1.02R2 <R1 <1.15R2. By configuring in this way, the cage segment 11a can be appropriately used as a roller guide.

  Further, when the cage segment 11a moves to the outer diameter side, a contact point where the tapered roller 12a contacts the inner diameter side guide surface 17a is defined as S, and a plane 36a including S and the central axis of the tapered roller 12a, and the PCD 22 If the angle formed with the flat surface 36b including the central axis of the tapered roller 12a is θ °, the relationship is 40 ° <θ ° <70 °. The same applies to the angle formed between the plane including the contact point where the tapered roller 12a contacts the inner diameter guide surface 17b and the central axis of the tapered roller 12a and the plane 36b that contacts the PCD 22 and includes the central axis of the tapered roller 12a. Constitute.

  By doing so, the cage segment 11a can be appropriately guided. Specifically, by making θ ° larger than 40 °, it is possible to reduce the radial movement amount of the cage segment 11a in the guide gap. Further, by making θ ° smaller than 70 °, the amount of movement of the cage segment 11a in the circumferential direction can be reduced in the guide gap.

  Similarly, in the pocket 13b which is the second pocket, when the cage segment 11a moves to the inner diameter side, the contact point where the tapered roller 12b contacts the outer diameter side guide surfaces 18b and 18c, and the central axis of the tapered roller 12b, It is preferable that the angle between the plane including the plane and the plane in contact with the PCD 22 and including the central axis of the tapered roller 12b be the same. The outer diameter side guide surfaces 18a and 18d are preferably configured similarly.

  Here, an oil sump 25 is provided on the side wall surface on the outer diameter side from the inner diameter side guide surfaces 17a and 17b. The oil reservoir 25 is provided in a groove shape so as to be recessed in the circumferential direction. By configuring in this manner, the oil reservoir 25 can hold the lubricant. Then, the lubricant can be supplied from the oil reservoir 25 to the tapered roller 12a, and the tapered roller 12a can be smoothly rolled. Such a portion does not come into contact with the tapered roller 12a and does not require strength. Therefore, as shown in FIG. 1, a groove-like oil sump 25 that is recessed in the circumferential direction is provided, and more The lubricant can be retained. Further, the oil sump 25 may be provided so as to be connected to the inner diameter side guide surfaces 17a and 17b with a smooth R shape. Similarly, an oil reservoir may be provided on the side wall surface on the inner diameter side of the inner diameter side guide surfaces 17c and 17d and on the side wall surface on the inner diameter side of the outer diameter side guide surfaces 18a to 18d.

  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 distance between the ends 27a and 27b in the axial direction is the same as the distance between the pair of protrusions 16a and 16b 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 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 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 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, between the adjacent two cage segments 11a, 11b, etc., the tapered roller 34 is disposed in the pocket 35 to be formed, except between the first cage segment 11a and the last cage segment 11d. Is done. Here, the pocket 35 becomes a second pocket.

  As described above, the cage segments 11a to 11d are roller guides, and when guiding the cage segments 11a to 11d, the inner diameter side and outer diameter side guide surfaces 17 provided on the side wall surfaces on both sides of the pockets 13 and 35 are used. 18 and the tapered roller 34 are in contact with each other through two lines. Therefore, since the tapered roller 34 and the cage segments 11a to 11d do not come into contact with each other at the corner 23, the corner 23 can be prevented from being damaged, and wear, heat generation, torque increase, and the like can be prevented. can do.

  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. With reference to FIG. 5, FIG. 6, and FIG. 8, the cage segments 11a and the like are sequentially arranged so as to contact each other, and in the gap 39 generated between the cage segment 11a and the cage segment 11d, The spacer 26 is arranged. 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.

  In the above-described embodiment, the inner diameter side and outer diameter side guide surfaces have arc-shaped cross sections, but the present invention is not limited to this and may be flat. FIG. 9 is an enlarged sectional view showing the vicinity of the first pocket of the cage segment in this case, and corresponds to FIG. Referring to FIG. 9, the inner diameter side guide surfaces 44 a and 44 b provided on the side wall surfaces on both sides of the pocket 43 as the first pocket included in the cage segment 41 are each composed of a flat surface.

  Here, the inner diameter side guide surfaces 44 a and 44 b and the tapered roller 42 held in the pocket 43 come into contact with each other through two lines. By comprising in this way, the corner | angular part 45a of an internal diameter side and the tapered roller 42 do not contact, and damage to the corner | angular part 45a can be prevented. Similarly, the outer diameter side guide surfaces of the second pockets included in the cage segment 41 are each configured as a flat surface, and the outer diameter side guide surfaces and the tapered rollers held in the second pocket are represented by two lines. Configure to touch. By carrying out like this, a contact with the corner | angular part by the side of an outer diameter and a tapered roller can be prevented, and damage to the corner | angular part by the side of an outer diameter can be prevented.

  Also in this case, as described above, the contact point at which the tapered roller 42 contacts the inner diameter side guide surface 44a is defined as S ′, the plane 46a including S ′ and the central axis of the tapered roller 42, and the PCD 47, If the angle between the tapered roller 42 and the flat surface 46b including the central axis is θ ′ °, it is preferable that 40 ° <θ ′ ° <70 °. Similarly, the other inner diameter side guide surface 44b and the like, and the outer diameter side guide surface of the second pocket included in the cage segment 41 are preferably configured similarly. Similarly to the above, an oil sump 48 may be provided on the outer diameter side of the inner diameter side guide surfaces 44a and 44b.

  Further, in the above embodiment, the inner diameter side and outer diameter side guide surfaces provided on the side wall surfaces of the pockets of the cage segments are each configured with one radius of curvature and one center of curvature. However, the present invention is not limited to this, and a plurality of arcs may be used. Moreover, a curved surface and a plane may be included. Furthermore, the inner diameter side and outer diameter side guide surfaces may be provided continuously in the axial direction, or may be provided partially in the axial direction.

  10 and 11 show an example of a main shaft support structure of a wind power generator in which a 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 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 roller bearing according to an embodiment of the present invention, and holds an outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, and the rollers. A plurality of pillars extending in the direction along the axis so as to form first and second pockets, and a connecting part extending in the circumferential direction so as to connect the plurality of pillars, and between the outer ring and the inner ring And a plurality of cage segments arranged sequentially in the circumferential direction. Of the side wall surfaces on both sides of the first pocket, an inner diameter side guide surface for guiding the rollers held in the first pocket is provided on the inner diameter side of the roller pitch circle diameter. Of the side wall surfaces on both sides of the second pocket, an outer diameter side guide surface for guiding the rollers held in the second pocket is provided on the outer diameter side of the roller pitch circle diameter. Here, the inner diameter side guide surface and the outer diameter side guide surface are in contact with each other through two lines.

  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, in order to improve productivity and the like, a cage segment having a shape in which one annular cage is divided and configured as described above can prevent breakage of the cage segment. Then, the main shaft support structure of the wind power generator can achieve a long life.

  In the above-described embodiment, as the first pocket, two inner diameter side guide surfaces are provided on the side wall surfaces on both sides of one pocket, and as the second pocket, two outer surfaces are provided on the side wall surfaces on both sides of the other pocket. Although the radial guide surface is provided, the present invention is not limited thereto, and two inner diameter guide surfaces and two outer diameter guide surfaces may be provided in one pocket so as to have the above-described relationship. Good. That is, one pocket may be used as both the first and second pockets. In this case, it is possible to hold the roller in the pocket by inserting the roller from the axial direction.

  In the above embodiment, the cage segment has a protrusion protruding in the circumferential direction. However, the present invention is not limited to this, and a type having no protrusion, that is, a column part on the outer side in the circumferential direction. The present invention is also applied to a cage segment having a configuration in which is arranged.

  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. Furthermore, it is not necessary to arrange a roller between adjacent cage segments, or a roller may be arranged between the spacer and the cage segment.

  In the above embodiment, the cage segment has three pockets for accommodating the rollers. However, the present invention is not limited to this, and the cage segment may have four or more pockets. Since the cage segment having such a configuration has many pockets provided with guide surfaces, the cage segment is more stably arranged in the radial direction.

  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.

  Since the roller bearing according to the present invention can smoothly roll the roller and can prevent the cage segment from being damaged, the roller bearing is effectively used for a roller bearing that requires a long life.

  The cage segment according to the present invention can be used effectively when it is provided in a roller bearing that requires a long life because the roller can smoothly roll and there is little risk of breakage.

  Further, the main shaft support structure of the wind power generator according to the present invention can also be effectively used for the main shaft support structure of the wind power generator that requires a long life.

It is an expanded sectional view showing the 1st pocket circumference of a cage segment contained in a tapered roller bearing concerning one embodiment of this invention. It is a perspective view of a cage segment included in a 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 showing the 1st pocket circumference of a cage segment concerning other embodiments of this 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. It is an illustration side view of the main shaft support structure of the wind power generator shown in FIG. 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. 12 in the plane containing a pillar part and orthogonal to an axis | shaft. It is an expanded sectional view which shows the pocket periphery of the conventional holder | retainer, and the circular arc of a guide surface is a thing concentric with the circular arc of a roller. It is an expanded sectional view which shows the pocket periphery of the conventional holder | retainer, and the center of curvature of the circular arc which comprises a guide surface exists on PCD.

Explanation of symbols

  11a, 11b, 11c, 11d, 41 Cage segment, 12a, 12b, 12c, 34, 42 Tapered roller, 13, 13a, 13b, 13c, 35, 43 Pocket, 14a, 14b, 14c, 14d Pillar part, 15a, 15b Connecting portion, 16a, 16b Protruding portion, 17, 17a, 17b, 17c, 17d, 44a, 44b Inner diameter side guide surface, 18, 18a, 18b, 18c, 18d Outer diameter side guide surface, 19, 20, 30a, 30b Oil groove, 21a, 21b end face, 22, 47 PCD, 23, 23a, 23b, 23c, 45a Corner, 24a Inner face, 24b Outer face, 25, 48 Oil reservoir, 26 Spacer, 27a, 27b End, 28 central part, 31 tapered roller bearing, 32 outer ring, 33 inner ring, 36a, 36b, 46a, 46b plane, 39 clearance, 40 Rear clearance, 70 Support base, 71 Swivel seat bearing, 72 Nacelle, 73 Casing, 74 Bearing housing, 75 Spindle support bearing, 76 Spindle, 77 Blade, 78 Speed increaser, 79 Generator, 80 Swivel motor, 81 Reduction gear .

Claims (4)

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 first and second pockets for holding the rollers, and a connecting part extending in the circumferential direction so as to connect the plurality of pillars; And a plurality of cage segments arranged in series in the circumferential direction between the inner rings, and a roller bearing that rotatably supports a main shaft provided in the wind power generator ,
The plurality of cage segments are independent from each other;
The cage segment is a roller guide;
When the plurality of cage segments are sequentially arranged in the circumferential direction, a circumferential gap is provided between the first cage segment and the last cage segment in consideration of thermal expansion.
Of the side wall surfaces on both sides of the first pocket, on the inner diameter side of the roller pitch circle diameter, except for corners that are portions where the side wall surfaces on both sides of the first pocket and the inner diameter surface of the cage segment intersect. An inner diameter side guide surface that is in contact with the roller held in the first pocket and guides the roller held in the first pocket is provided,
Of the side wall surfaces on both sides of the first pocket, portions other than the portion provided with the inner diameter side guide surface are bent with respect to the inner diameter side guide surface,
Of the side wall surfaces on both sides of the second pocket, on the outer diameter side of the roller pitch circle diameter, a corner portion that is a portion where the side wall surfaces on both sides of the second pocket intersect with the outer diameter surface of the cage segment An outer diameter side guide surface that is in contact with the roller held in the second pocket at a portion excluding the guide and guides the roller held in the second pocket is provided;
Of the side wall surfaces on both sides of the second pocket, portions other than the portion provided with the outer diameter side guide surface are bent with respect to the outer diameter side guide surface,
When the cage segment is moved to the outer diameter side and the inner diameter side guide surface and the roller are brought into contact with each other, the corner portion of the inner diameter side guide surface and the roller are not in contact with each other.
When the cage segment is moved to the inner diameter side and the outer diameter side guide surface and the roller are brought into contact with each other, a corner portion of the outer diameter side guide surface and the roller are not in contact with each other. . The inner diameter side and outer diameter side guide surfaces are arc-shaped in cross section,
The radius of curvature of the arc is greater than the radius of curvature of the roller,
The roller bearing according to claim 1, wherein the center of curvature of the arc is on the inner diameter side and the outer diameter side with respect to the roller pitch circle diameter. The roller bearing according to claim 1, further comprising a spacer disposed between a first cage segment and a last cage segment that are continuous in the circumferential direction. 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, and a plurality extending in a direction along the axis so as to form first and second pockets for holding the rollers. And a plurality of retainer segments that are sequentially connected in the circumferential direction between the outer ring and the inner ring. ,
  The plurality of cage segments are independent from each other;
  The cage segment is a roller guide;
  When the plurality of cage segments are sequentially arranged in the circumferential direction, a circumferential gap is provided between the first cage segment and the last cage segment in consideration of thermal expansion.
  Of the side wall surfaces on both sides of the first pocket, on the inner diameter side of the roller pitch circle diameter, except for corners that are portions where the side wall surfaces on both sides of the first pocket and the inner diameter surface of the cage segment intersect. An inner diameter side guide surface that is in contact with the roller held in the first pocket and guides the roller held in the first pocket is provided,
  Of the side wall surfaces on both sides of the first pocket, portions other than the portion provided with the inner diameter side guide surface are bent with respect to the inner diameter side guide surface,
  Of the side wall surfaces on both sides of the second pocket, on the outer diameter side of the roller pitch circle diameter, a corner portion that is a portion where the side wall surfaces on both sides of the second pocket intersect with the outer diameter surface of the cage segment An outer diameter side guide surface that contacts the rollers held in the second pocket at a portion other than the first pocket and guides the rollers held in the second pocket;
  Of the side wall surfaces on both sides of the second pocket, portions other than the portion provided with the outer diameter side guide surface are bent with respect to the outer diameter side guide surface,
  When the cage segment is moved to the outer diameter side and the inner diameter side guide surface and the roller are brought into contact with each other, the corner portion of the inner diameter side guide surface and the roller are not in contact with each other,
  Wind power generation where the cage segment is moved to the inner diameter side and the outer diameter side guide surface and the roller are not in contact with each other when the outer diameter side guide surface and the roller are brought into contact with each other. Main shaft support structure of the machine.

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