Tapered roller bearings and assembly jigs

Abstract

To provide tapered roller bearings and assembly jigs that can improve assembly efficiency. [Solution] The tapered roller bearing 1 comprises inner and outer rings 11 and 12, a plurality of tapered rollers 15, and a cage 17 that holds the tapered rollers 15. The cage 17 has a plurality of cage segments 20 divided in the circumferential direction. The cage segments 20 have a large-diameter side arc-shaped portion and a small-diameter side arc-shaped portion extending in the circumferential direction, and a plurality of column portions connecting these large-diameter side arc-shaped portions. A ring-shaped assembly jig AJ that restricts the movement of the plurality of cage segments 20 toward the outer diameter is detachably provided on the inner ring 11. The assembly jig AJ has a ring-shaped assembly jig body 32 including an engaging portion that detachably engages with an engaging portion provided on the large-diameter side arc-shaped portion, and a fall prevention member that extends axially from the assembly jig body 32 and prevents the tapered rollers 15 that are allowed to be pulled out toward the outer diameter from falling toward the outer diameter in the cage segments 20.

Description

Technical Field

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[0001] The present invention relates to a tapered roller bearing for a main shaft of a wind power generation device, a tapered roller bearing for industrial machinery, particularly a large-sized tapered roller bearing having an outer diameter exceeding 1 m, and an assembly jig.

Background Art

[0002] A cage made of a steel plate is usually used for a tapered roller bearing. The cage made of a steel plate is manufactured, for example, by press working. However, in the case of a large-sized one having an outer diameter exceeding 1 m, press working becomes difficult due to equipment problems. On the other hand, for a cage manufactured by machining, compared with a press-worked product, the cost increases significantly, and there is a lot of waste from the viewpoint of material loss. Therefore, in order to reduce the cost, a segmented cage in which a plurality of cage segments are formed by injection molding of resin and these are assembled has been proposed (for example, Patent Documents 1 and 2). Note that in injection molding of resin, it is not possible to mold a large integral ring having an outer diameter exceeding 1 m.

[0003] When assembling a single-row tapered roller bearing into a windmill at a customer site, there is a procedure for handling an inner ring assembly in which an inner ring, tapered rollers, and a cage are assembled with the small end face of the inner ring facing downward. At this time, in order to prevent the cage and the tapered rollers from coming apart, a jig is attached to the inner ring, and a method for suppressing the separation of the segmented cage with this jig has been devised.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0006] The object of the present invention is to provide a tapered roller bearing and an assembly jig that can improve ease of assembly. [Means for solving the problem]

[0007] The tapered roller bearing of the present invention comprises an inner ring, an outer ring, a plurality of tapered rollers interposed between the inner and outer rings, and a cage that holds the tapered rollers, wherein the cage is constructed by arranging a plurality of cage segments in the circumferential direction, and the cage segments have a plurality of circumferentially arranged pockets for housing the tapered rollers. The cage segment has a large-diameter side arc-shaped portion and a small-diameter side arc-shaped portion extending in the circumferential direction, and a plurality of columnar portions connecting these large-diameter and small-diameter side arc-shaped portions, and the pocket is formed by the large-diameter side arc-shaped portion, the small-diameter side arc-shaped portion and the columnar portions, in a tapered roller bearing, A ring-shaped assembly jig that restricts the movement of the plurality of retainer segments toward the outer diameter is detachably provided on the inner ring, The aforementioned assembly jig is A ring-shaped assembly jig body including an engaging portion that detachably engages with the engaged portion provided on the large-diameter side arc-shaped portion, A member is provided that extends axially from the main body of this assembly jig and prevents the tapered roller from falling out toward the outer diameter side of the retainer segment, which is permitted to be pulled out toward the outer diameter side. It holds.

[0008] In this configuration, when assembling the tapered roller bearing, the inner ring is placed with its large-diameter side facing downwards. In this state, the tapered rollers and cage segments are arranged around the inner ring's raceway to assemble the inner ring assembly. Next, the inner ring assembly is inverted so that the large-diameter side of the inner ring faces upwards. Then, the engaging portion of the assembly jig body is engaged with the engaging portion provided on the large-diameter arc-shaped portion of the cage segment, and the assembly jig is fixed to the inner ring. At this time, tapered rollers that are allowed to be pulled out toward the outer diameter are prevented from falling out toward the outer diameter by a fall-prevention member.

[0009] In this inner ring assembly, where the assembly jig is fixed to the inner ring, the separation of the tapered rollers and cage is suppressed by the assembly jig. Therefore, even when the inner ring is suspended, the inner ring assembly will not undesirably separate. After the tapered roller bearing is installed in the machine, the fixing between the assembly jig and the inner ring is released, and the ring-shaped assembly jig is removed from the tapered roller bearing in one go. After the tapered roller bearing is assembled, the tapered roller bearing will not separate even when the assembly jig is removed. In this way, the inner ring assembly does not separate during the assembly of the tapered roller bearing, making it easier to handle than conventional structures. Also, after the assembly of the tapered roller bearing, the ring-shaped assembly jig can be removed in one go. Therefore, the working time can be shortened compared to conventional structures where the jig is removed from the inner ring one by one. Thus, the ease of assembling the tapered roller bearing can be improved compared to conventional structures.

[0010] The engaged portion may be a plate-shaped protruding plate portion that projects axially from the large-diameter side surface of the large-diameter side arc-shaped portion and extends along the circumferential direction. In this case, the engaging portion of the assembly jig can be engaged with the engaged portion of the segment by moving the assembly jig in the axial direction.

[0011] The retainer segment has a pocket having a first guide claw extending inward from the column portion, and a pocket having a second guide claw extending outward from the column portion, and the inner circumferential surfaces of the first and second guide claws have an R shape that conforms to the outer circumferential surface of the tapered roller. The anti-detachment member may be configured to prevent the tapered roller housed in the pocket having the first guide claw from falling out toward the outer diameter side. The tapered roller housed in the pocket having the first guide claw corresponds to a tapered roller that is permitted to be pulled out toward the outer diameter.

[0012] In this case, since the inner surfaces of the first and second guide claws have an R shape that follows the outer surface of the tapered roller, wear on the raceway is suppressed more effectively than with a retainer guided by the raceway surface of the inner and outer rings. The anti-drop member prevents the tapered roller housed in the pocket with the first guide claw from falling out. The tapered roller housed in the pocket with the second guide claw is prevented from falling out toward the inner diameter side by the raceway surface of the inner ring when it is in the inner ring assembly state.

[0013] The assembly jig may include multiple parts that can be divided in the circumferential direction. In this case, the manufacturing of the assembly jig becomes easier.

[0014] The assembly jig body includes a plurality of assembly members that can be divided in the circumferential direction, The aforementioned assembly jig is The plurality of assembly members, including the engagement portion that engages with the outer diameter side engagement surface and the inner diameter side engagement surface of the protruding plate portion, Multiple fixing members connect these assembly members to the inner ring and are detachably fixed to the inner ring, It may have multiple of the aforementioned anti-detachment members.

[0015] In this case, the engaging portion of the assembly member is engaged with the outer diameter engaging surface and the inner diameter engaging surface of the protruding plate portion of the retainer segment. Simultaneously, multiple assembly members are fixed to the inner ring via multiple fixing members. This reliably restricts the movement of the retainer segment toward the outer diameter.

[0016] The assembly jig may have fastening members that fasten adjacent assembly members in the circumferential direction. In this case, by fastening adjacent assembly members in the circumferential direction to each other with fastening members, the assembly jig body can be easily assembled into a ring shape.

[0017] The anti-drop member may be fixed to the assembly member, extend to the small-diameter side in the axial direction of the tapered roller bearing, and contact the corner portion on the large-diameter side of the tapered roller that allows extraction to the outer diameter side. In this way, by bringing the anti-drop member into contact with the corner portion on the large-diameter side of the tapered roller, it is possible to simply and reliably prevent the tapered roller from dropping to the outer diameter side.

[0018] The fixing member may be detachably fixed to the large-diameter side surface of the inner ring. In this case, when supported so that the large-diameter side surface of the inner ring in the inner ring assembly is upward, the fixing member can be easily fixed to the large-diameter side surface of the inner ring.

[0019] The assembly jig may be inserted into the tapered roller bearing from the large-diameter side of the bearing and fixed to the tapered roller bearing by fixing the fixing member and the inner ring. In this case, in a state where the large-diameter side surface of the inner ring in the inner ring assembly is supported upward, the ring-shaped assembly jig can be easily inserted into the tapered roller bearing from the large-diameter side of the bearing. Further, by fixing the fixing member and the inner ring, the assembly jig can be easily fixed to the tapered roller bearing. Conversely, by releasing the fixing between the fixing member and the inner ring and separating the ring-shaped assembly jig from the large-diameter side of the bearing, the assembly jig can be easily removed from the tapered roller bearing.

[0020] When the diameter of the small flange portion of the inner ring is M, the angle of the small flange portion with respect to a straight line perpendicular to the central axis of the inner ring is L, the chamfer width of the tip of the small flange portion is K, and the distance from the contact point C where the side surface of the small flange portion and the small-diameter side end surface of the tapered roller contact when the tapered roller is rotated about the tip of the large flange portion of the inner ring to the central axis is y3, the following condition may be satisfied. (M / 2)-K·cosL>y3 9]According to this configuration, since the end surface on the small-diameter side of the tapered roller contacts the contact point C on the side surface of the small flange portion, rotation with the large flange portion of the tapered roller as the rotation center is suppressed.

[0021] The retainer segment may be polyetheretherketone blended with carbon fiber or polyetheretherketone blended with glass fiber. Since the carbon fiber or glass fiber is fibrous, the coefficient of thermal expansion can be efficiently reduced. Therefore, it is possible to prevent the circumferential gap between the segments from becoming zero when the retainer segment expands. The assembly member and the fixing member may be made of steel, and the anti-drop member may be made of resin. When the assembly member and the fixing member are made of steel, when the assembly jig is assembled in a ring shape, the rigidity of the assembly jig can be increased, and the workability when attaching and detaching this assembly jig to and from the inner ring can be further improved. When the anti-drop member is made of resin, it is possible to prevent the rolling surface of the tapered roller from being undesirably damaged when the anti-drop member is brought into contact with the tapered roller.

[0022] The tapered roller bearing may be a large-sized bearing with an outer diameter of 1 m or more used in a wind power generation device. In this case, a tapered roller bearing with excellent assembly properties can be applied to the large-sized bearing used in the wind power generation device, and the working hours, maintenance costs, etc. of the tapered roller bearing can be suppressed.

[0023] The assembly jig of the present invention includes a retainer in which a plurality of retainer segments are arranged in the circumferential direction, and the retainer segment has a large-diameter side arc portion and a small-diameter side arc portion extending in the circumferential direction, and a plurality of pillar portions connecting these large-diameter side and small-diameter side arc portions, and is an assembly jig for a tapered roller bearing. A ring-shaped assembly jig body including an engaging portion that detachably engages with an engaged portion provided on the large-diameter side arc portion. An anti-drop member provided so as to extend axially from the assembly jig body, for preventing the outer diameter side of the tapered roller, which is allowed to be withdrawn to the outer diameter side in the retainer segment, from dropping off. A fixing member that connects the assembly jig body and the inner ring of the tapered roller bearing and is detachably fixed to the inner ring.

Effects of the Invention

[0024] The tapered roller bearing of the present invention comprises an inner ring, an outer ring, a plurality of tapered rollers interposed between the inner and outer rings, and a cage that holds the tapered rollers, wherein the cage is constructed by arranging a plurality of cage segments in the circumferential direction, the cage segments have a plurality of pockets arranged in the circumferential direction for housing the tapered rollers, the cage segments have a large-diameter side arc-shaped portion and a small-diameter side arc-shaped portion extending in the circumferential direction, and a plurality of columnar portions connecting the large-diameter side arc-shaped portion and the small-diameter side arc-shaped portion, and A tapered roller bearing in which the pocket is formed by the column portion, wherein a ring-shaped assembly jig that restricts the movement of the plurality of cage segments toward the outer diameter is detachably provided on the inner ring, and the assembly jig has a ring-shaped assembly jig body including an engaging portion that detachably engages with an engaging portion provided on the large-diameter side arc-shaped portion, and a fall prevention member provided so as to extend axially from the assembly jig body and prevents the tapered roller, which is allowed to be pulled out toward the outer diameter, from falling toward the outer diameter side in the cage segment.Therefore, the ease of assembly of the tapered roller bearing can be improved. [Brief explanation of the drawing]

[0025] [Figure 1] This is a longitudinal cross-sectional view of a tapered roller bearing according to the first embodiment of the present invention. [Figure 2] This is a front view of the inner ring assembly of a cylindrical roller bearing, seen from the axial direction. [Figure 3] This is a perspective view showing a part of the inner wheel assembly. [Figure 4] This is a cross-sectional view showing the cage segment of a tapered roller bearing. [Figure 5] This is a perspective view of the retainer segment. [Figure 6] This is a front view of the assembly jig for a cylindrical roller bearing, viewed from the axial direction. [Figure 7] This is a longitudinal cross-sectional view of the inner ring assembly and assembly jig. [Figure 8] This is a disassembled perspective view of the assembly jig. [Figure 9] This is a perspective view of the assembly jig. [Figure 10]This is a schematic diagram showing the relationship between the cone rollers and the large flange of the inner ring when the cone rollers are placed in the inner ring with the large end face of the inner ring facing downwards. [Figure 11] This is a schematic diagram showing the rotational state of the cone rollers arranged on the inner ring's raceway surface. [Figure 12] This is a schematic diagram showing the relationship between the height of the small flange portion of the inner ring and the height of the cone rollers when the cone rollers arranged on the inner ring's raceway are rotated. [Figure 13] This is an exploded perspective view of the main part of an assembly jig for a tapered roller bearing according to a second embodiment of the present invention. [Figure 14] This is a cutaway perspective view of a wind power generation device using tapered roller bearings according to one embodiment of the present invention. [Figure 15A] This is a cross-sectional view of a conventional retainer segment. [Figure 15B] This is a perspective view of the retainer segment. [Modes for carrying out the invention]

[0026] [First Embodiment] A tapered roller bearing according to an embodiment of the present invention will be described with reference to Figures 1 to 12. This tapered roller bearing is applicable, for example, to the main shaft of a wind power generation device or to large tapered roller bearings with an outer diameter exceeding 1 m for industrial machinery. However, the applications of the tapered roller bearing are not limited to these.

[0027] <Schematic configuration of tapered roller bearing> As shown in Figure 1, the tapered roller bearing 1 of this embodiment comprises an inner ring 11, an outer ring 12, a plurality of tapered rollers 15 interposed between the inner and outer rings 11 and 12, and a cage 17 that holds the tapered rollers 15 at regular intervals. The cage 17 has radially opening pockets 16, and the tapered rollers 15 are held in these pockets 16.

[0028] In this specification, tapered roller bearings are sometimes simply referred to as "bearings." In the following description, the direction of the bearing center axis AX is referred to as the "axial direction," the direction perpendicular to the bearing center axis AX is referred to as the "radial direction," and the direction around the bearing center axis AX is referred to as the "circumferential direction." Furthermore, the side facing the bearing center axis AX is referred to as the "inner diameter side," and the side moving away from the bearing center axis AX is referred to as the "outer diameter side." In addition, the direction in which the diameter of the raceway surface 14 of the outer ring 12 decreases in the axial direction is referred to as the "small diameter side," and the direction in which the diameter of the raceway surface 14 increases is referred to as the "large diameter side."

[0029] The outer ring 12 has a raceway surface 14 on its inner circumference on which the tapered rollers 15 roll. The inner ring 11 has a raceway surface 13 on its outer circumference on which the tapered rollers 15 roll, and a large flange portion 19 and a small flange portion 18 on both sides in the axial direction, flanking the raceway surface 13, on which the end faces of the tapered rollers 15 come into contact.

[0030] <Regarding retainer segments, etc.> Figure 2 is a front view of an inner ring assembly As, which includes an inner ring 11, a retainer 17, and tapered rollers 15, viewed from the axial direction. The retainer 17 is a segment retainer having a plurality of retainer segments 20 divided in the circumferential direction. The retainer segments 20 in this embodiment are made of resin. In detail, the retainer segments 20 are, for example, polyetheretherketone compounded with carbon fibers or polyetheretherketone compounded with glass fibers. However, the material of the retainer segments 20 is not limited to these.

[0031] Figure 3 is a perspective view of the inner ring assembly As, showing only one retainer segment 20. In the following description, the retainer segment 20 may be simply referred to as "segment 20". As shown in Figure 5, segment 20 has a large-diameter side arc-shaped portion 22 and a small-diameter side arc-shaped portion 21 extending in the circumferential direction, and a plurality of column portions 23 connecting these large-diameter and small-diameter side arc-shaped portions 22 and 21. The small-diameter side arc-shaped portion 21 and the large-diameter side arc-shaped portion 22 are opposite each other at a predetermined distance, and a plurality of column portions 23 are installed between the small-diameter side arc-shaped portion 21 and the large-diameter side arc-shaped portion 22.

[0032] A pocket 16 for housing the cone roller 15 (Figure 4) is formed by the space enclosed by two adjacent columnar sections 23, 23, a small-diameter side arc-shaped section 21, and a large-diameter side arc-shaped section 22. In this embodiment, four columnar sections 23 are provided in one segment 20, and three pockets 16 are provided arranged in the circumferential direction. However, the number of pockets 16 is not limited to this, and multiple pockets may be provided in the circumferential direction in one segment 20.

[0033] As shown in Figure 4, of the three pockets 16, the pocket 16 in the circumferential direction center has a first guide claw 24a extending inward from the column portion 23. The pockets 16, 16 at both ends in the circumferential direction have second guide claws 24b extending outward from the column portion 23. The first guide claw 24a prevents the tapered roller 15 from coming out (falling out) inward, and the second guide claw 24b prevents the tapered roller 15 from coming out (falling out) inward.

[0034] The roller guide surfaces 24aa and 24ba, which are the inner circumferential surfaces of the first and second guide claws 24a and 24b, have an R shape that follows the outer circumferential surface of the tapered roller 15. Due to these guide claws 24a and 24b, the cage 17 is guided only by the tapered roller 15 during operation. In other words, the tapered roller bearing of this embodiment can achieve roller guidance.

[0035] The tapered rollers 15 can be inserted into the pockets 16, 16 at both ends in the circumferential direction from the inner diameter side of the segment 20. The second guide claw 24b prevents the tapered rollers 15 from coming out to the outer diameter side. Also, in the state of the inner ring assembly As shown in Figure 3, the raceway surface 13 of the inner ring 11 is located on the inner diameter side, so the tapered rollers 15 cannot come out to the inner diameter side either.

[0036] As shown in Figure 4, the tapered roller 15 can be inserted into the pocket 16 in the circumferential center from the outer diameter side. In other words, the tapered roller 15 housed in the pocket 16 in the circumferential center is allowed to be pulled out toward the outer diameter side of the segment 20. In the state of the inner ring assembly As shown in Figure 3, the raceway surface 13 of the inner ring 11 is located on the inner diameter side, so the tapered roller 15 will not come out toward the inner diameter side, but the tapered roller 15 housed in the pocket 16 in the circumferential center may fall out toward the outer diameter side. In this embodiment, the fall prevention member 33 of the assembly jig AJ, which will be described later, prevents the tapered roller 15, which is allowed to be pulled out toward the outer diameter side, from falling out toward the outer diameter side.

[0037] <Regarding assembly jigs, etc.> As shown in Figure 1, the tapered roller bearing 1 is equipped with a ring-shaped assembly jig AJ that can be detachably attached to the inner ring 11. The assembly jig AJ restricts the movement of the multiple cage segments 20 toward the outer diameter during bearing assembly. As shown in Figures 6 and 7, the assembly jig AJ includes multiple parts that can be divided in the circumferential direction. Specifically, as shown in Figure 8, the assembly jig AJ has a ring-shaped assembly jig body 32, multiple anti-detachment members 33 that extend axially from the assembly jig body 32, multiple fixing members 34, and multiple fastening members 35. This assembly jig AJ is independently traded in the market.

[0038] As shown in Figure 9, the assembly jig body 32 includes an engaging portion Kg that detachably engages with a engaged portion Hk (described later) provided on the large-diameter side arc-shaped portion 22 of the segment 20. Here, the engaged portion Hk is a plate-shaped protruding plate portion that protrudes axially from the large-diameter side surface 22b of the large-diameter side arc-shaped portion 22 and extends along the circumferential direction. The engaging portion Kg of the assembly jig body 32 can engage with the outer diameter side engaging surface Hka and the inner diameter side engaging surface Hkb of this protruding plate portion.

[0039] As shown in Figure 8, the assembly jig body 32 includes a plurality of assembly members 36 that can be divided in the circumferential direction. Each assembly member 36 is made of, for example, steel. As shown in Figure 9, the plurality of assembly members 36 include engaging parts Kg that engage with the outer diameter side engaging surface Hka and the inner diameter side engaging surface Hkb of the protruding plate portion. As shown in Figure 8, each assembly member 36 is an arc-shaped member with a substantially rectangular cross-section and extending a predetermined length in the circumferential direction. Adjacent assembly members 36, 36 in the circumferential direction are fastened together by fastening members 35. A plurality of bolt holes 36a extending in the axial direction are formed at both ends of the assembly member 36 in the circumferential direction.

[0040] The fastening member 35 has a rectangular plate-shaped fastening member body 35a fixed along the outer surface portions of adjacent assembly members 36, 36 in the circumferential direction, and a plurality of fasteners, which are bolts 35b. The fastening member body 35a is made of steel, for example. The fastening member body 35a has through holes through which the plurality of bolts 35b are inserted. As shown in Figure 9, the fastening member body 35a is positioned on the outer surface portions of adjacent assembly members 36, 36 with their end faces in contact with each other in the circumferential direction. Furthermore, by inserting the plurality of bolts 35b through the through holes of the fastening member body 35a and screwing these bolts 35b into the bolt holes 36a of the assembly member 36, the assembly jig body 32 can be assembled into a ring shape.

[0041] Of the assembly member 36, a groove (engagement portion Kg) with a rectangular cross-section extending along the circumferential direction is formed on the inner surface of the segment 20 facing the large-diameter side arc-shaped portion 22. As shown in Figure 7, the upper groove surface of the groove portion, which is the engagement portion Kg, abuts against the outer diameter side engagement surface Hka of the protruding plate portion. At the same time, the lower groove surface of the groove portion abuts against the inner diameter side engagement surface Hkb of the protruding plate portion, so that the engagement portion Kg of the assembly jig body 32 engages with the engaged portion Hk of the segment 20.

[0042] As shown in Figure 9, the assembly member 36 has a plurality (two in this example) of fixing holes 36b for fixing the anti-drop member 33. These fixing holes 36b are formed at predetermined intervals. The anti-drop member 33 prevents the tapered roller 15 (Figure 3), which is housed in the pocket 16 having the first guide claw 24a, from falling out toward the outer diameter side. The anti-drop member 33 consists of a shaft-shaped member with a head 33a at one end in the axial direction and is fixed to the assembly jig body 32. The anti-drop member 33 is made of resin, for example.

[0043] The anti-detachment member 33 is inserted through each fixing hole 36b of the assembly member 36 from the outer surface of the assembly jig body 32, and the anti-detachment member 33 is fitted and fixed to the assembly jig AJ with the seating surface of the head 33a in contact with the outer surface of the assembly jig body 32. As shown in Figure 3, the anti-detachment member 33 extends axially towards the smaller diameter side of the tapered roller bearing, and the outer circumferential surface of each shaft-shaped member contacts the larger diameter corner 15a of the tapered roller 15, which is allowed to be pulled out toward the outer diameter side. This prevents the tapered roller 15 from falling out toward the outer diameter side.

[0044] Multiple (three in this example) fixing members 34 connect multiple assembly members 36 to the inner ring 11 and are detachably fixed to the inner ring 11. The multiple fixing members 34 are fixed to the inner ring 11 at equal circumferential intervals. The fixing members 34 are detachably fixed to the large end face 11a, which is the large diameter side surface of the inner ring 11, by bolts 37. Each fixing member 34 has a fixing member body 38, a spacer 39 provided at the outer diameter side end of the inner surface of the fixing member body 38, and multiple (two in this example) bolts 37, 37. The fixing member body 38 and the spacer 39 are made of, for example, steel.

[0045] The fixing member body 38 is a rectangular plate shape extending a predetermined length in the radial direction. Through holes for inserting bolts 37, 37 are formed at both longitudinal ends of the fixing member body 38. A bolt 37 is inserted through a through hole provided at one longitudinal end of the fixing member body 38, i.e., the inner diameter end. This bolt 37 can be screwed into a bolt hole 11aa formed in the large end face 11a of the inner ring 11. A bolt 37 is also inserted through a through hole provided at the outer diameter end of the fixing member body 38. This bolt 37 can be screwed into a bolt hole 36c formed in the assembly member 36 via a spacer 39. Therefore, the assembly jig AJ can be fixed to the tapered roller bearing by inserting it into the tapered roller bearing from the large diameter side of the bearing and fixing the fixing member 34 and the inner ring 11. After assembling the tapered roller bearing, when using the bearing, the assembly jig AJ is removed in the reverse order of the above procedure.

[0046] <Assembly method, effects and benefits> First, as shown in Figure 2, an inner ring assembly As is assembled, which integrates the inner ring 11, the tapered rollers 15, and the cage 17. To assemble the inner ring assembly As, first, with the large end face of the inner ring 11 facing downwards, the tapered rollers 15 that fit into the pockets 16 of the segment 20, excluding the circumferential center as shown in Figure 3, are arranged on the raceway surface 13 of the inner ring 11.

[0047] As shown in Figure 10, if the tapered roller 15 is placed on the raceway surface 13 of the inner ring 11 with the large end face 11a facing downwards, the tapered roller 15 may fall off due to its own weight. To prevent this falling off, the distance from the central axis AX1 of the inner ring 11 to the tip of the large flange portion 19 is made greater than the distance from the central axis AX1 of the inner ring 11 to the center of gravity C1 of the tapered roller 15.

[0048] In detail, with the large end face 11a of the inner ring 11 facing downwards and the tapered roller 15 placed on the raceway surface 13 of the inner ring 11, the angle at which the large flange portion 19 of the inner ring 11 is perpendicular to the central axis AX1 of the inner ring 11 is I, the chamfer width at the tip of the large flange portion 19 is H, the distance from the central axis AX1 of the inner ring 11 to the centroid C1 of the tapered roller 15 is y1, and the diameter of the large flange portion 19 is J, then the following equation (1) is satisfied. (J / 2)-H·cosI>y1 …Formula (1)

[0049] Next, as shown in Figure 3, the tapered roller 15 is inserted into the pocket 16 in the circumferential center of the segment 20. With the segment 20 in this state, the segment 20 is placed over the inner ring 11 on which the tapered rollers 15 are arranged. This inserts the tapered rollers 15 into the pockets 16 at both ends in the circumferential direction from the inner diameter side. The tapered rollers 15 and segment 20 are arranged around the raceway surface 13 of the inner ring 11 to assemble the inner ring assembly As. Next, the inner ring assembly As is inverted so that the large diameter side of the inner ring 11 is facing upwards.

[0050] Next, as shown in Figure 8, the assembly member 36, fastening member 35, fixing member 34, and anti-detachment member 33 are integrated to create a ring-shaped assembly jig AJ as shown in Figure 6. The ring-shaped assembly jig AJ may be manufactured before the assembly of the inner ring assembly As (Figure 2) or in parallel with the assembly of the inner ring assembly As (Figure 2). Then, as shown in Figure 7, the ring-shaped assembly jig AJ is inserted into the tapered roller bearing from the large diameter side of the bearing, the engaging part Kg of the assembly jig body 32 is engaged with the engaged part Hk of the segment 20, and the fixing member 34 of the assembly jig AJ is fixed to the inner ring 11. The assembly jig AJ is fixed to the inner ring 11 in this way. At this time, the tapered roller 15 that is allowed to be pulled out to the outer diameter side is prevented from falling out to the outer diameter side by the anti-detachment member 33 shown in Figure 3.

[0051] As shown in Figure 7, in the inner ring assembly As, where the assembly jig AJ is fixed to the inner ring 11, the separation of the tapered roller 15 and the retainer 17 is suppressed by the assembly jig AJ. Therefore, even when the inner ring 11 is suspended, the inner ring assembly As does not undesirably separate.

[0052] As shown in Figure 3, the tapered rollers 15 inserted into the pockets 16 at both ends in the circumferential direction of each segment 20 are prevented from falling out by the second guide claws 24b provided on the outer diameter side, and the tapered rollers 15 inserted into the pocket 16 in the circumferential center are prevented from falling out by the anti-fall member 33. Even when the inner ring assembly As shown in Figure 7 is inverted with the large end face 11a facing upwards, the tapered roller 15 remains sandwiched between the large flange 19 and the small flange 18, and the tapered roller 15 catches on the small flange 18, preventing each segment 20 from falling off.

[0053] When the conical roller 15 is not in contact with the large flange 19, it rotates in the direction of arrow AR1 around point A on the raceway surface 13, as shown in Figure 11. When the conical roller 15 is in contact with the large flange 19, it rotates in the direction of arrow AR2 around point B on the inner surface of the large flange 19, as shown in Figure 12.

[0054] When the tapered roller 15 shown in Figure 12 rotates around point B, the smaller diameter end face of the tapered roller 15 contacts point C on the side surface of the small flange 18. This suppresses the rotation of the tapered roller 15. Here, point C is the contact point where the smaller diameter end face of the tapered roller 15 contacts the side surface of the small flange 18 when the tapered roller 15 is rotated around the tip of the large flange 18 of the inner ring 11. In other words, contact point C is the intersection of the spline curve that traces the trajectory of the small end face corner of the tapered roller 15 when it rotates and the side surface of the small flange 18.

[0055] In detail, as described above, with the assembly jig fixed to the inner ring 11, the following equation (2) is satisfied when M is the diameter of the small flange portion 18 of the inner ring 11 shown in Figure 12, L is the angle between the small flange portion 18 and the line perpendicular to the central axis AX1 of the inner ring 11, K is the chamfer width at the tip of the small flange portion 18, and y3 is the distance from the contact point C to the central axis AX1. (M / 2)-K cosL>y3 …Formula (2)

[0056] As shown in Figure 1, after the tapered roller bearing 1 is installed in the machine, the fixing between the assembly jig AJ and the inner ring 11 is released, and the ring-shaped assembly jig AJ is removed from the tapered roller bearing 1 in one go. After the tapered roller bearing 1 is assembled, the tapered roller bearing 1 will not fall apart even if the assembly jig AJ is removed. In this way, the inner ring assembly does not fall apart during the assembly of the tapered roller bearing 1, making it easier to handle than the conventional structure. Also, after the assembly of the tapered roller bearing 1, the ring-shaped assembly jig AJ can be removed in one go. Therefore, the working time can be shortened compared to the conventional structure in which the jigs are removed from the inner ring one by one. Thus, the ease of assembling the tapered roller bearing 1 can be improved compared to the conventional structure.

[0057] As shown in Figure 5, the engaged portion Hk is a plate-shaped protruding plate portion that protrudes axially from the large-diameter side surface 22b of the large-diameter side arc-shaped portion 22 and extends along the circumferential direction.

[0058] As shown in Figure 4, the inner circumferential surfaces of the first and second guide claws 24a and 24b have an R shape that follows the outer circumferential surface of the tapered roller 15, making it possible to suppress wear on the raceway rings more effectively than with a retainer guided by the raceway surface of the inner and outer rings. Also, as shown in Figure 3, the anti-detachment member 33 prevents the tapered roller 15 housed in the pocket 16 having the first guide claw 24a from falling out. The tapered roller 15 housed in the pocket 16 having the second guide claw 24b is prevented from falling out toward the inner diameter side by the raceway surface 13 of the inner ring 11 in the state of the inner ring assembly As.

[0059] As shown in Figure 8, the assembly jig AJ includes multiple parts that can be divided in the circumferential direction, making it easy to manufacture. As shown in Figure 9, the assembly jig body 32 includes a plurality of assembly members 36 that can be divided in the circumferential direction. The assembly jig AJ includes a plurality of assembly members 36, each including an engaging portion Kg that engages with the outer diameter engaging surface Hka and the inner diameter engaging surface Hkb of the protruding plate portion, a plurality of fixing members 34 that connect these assembly members 36 and the inner ring 11 as shown in Figure 7 and are detachably fixed to the inner ring 11, and a plurality of anti-detachment members 33 as shown in Figure 9.

[0060] Therefore, the engagement portion Kg of the assembly member 36 is engaged with the outer diameter engagement surface Hka and the inner diameter engagement surface Hkb of the protruding plate portion of the retainer segment 20. At the same time, multiple assembly members 36 are fixed to the inner ring 11 shown in Figure 7 via multiple fixing members 34. This ensures that the retainer segment 20 does not move toward the outer diameter.

[0061] The assembly jig AJ in Figure 9 has fastening members 35 that fasten adjacent assembly members 36, 36 in the circumferential direction. Therefore, by fastening adjacent assembly members 36, 36 in the circumferential direction to each other with the fastening members 35, the assembly jig body 32 can be easily assembled into a ring shape. As shown in Figure 3, the anti-detachment member 33 is fixed to the assembly member 36 and extends axially toward the smaller diameter side of the tapered roller bearing, contacting the larger diameter corner 15a of the tapered roller 15, which is permitted to be pulled out toward the outer diameter side. In this way, by bringing the anti-detachment member 33 into contact with the larger diameter corner 15a of the tapered roller 15, the tapered roller 15 can be easily and reliably prevented from falling out toward the outer diameter side.

[0062] The fixing member 34 in Figure 7 is detachably fixed to the large end face 11a of the inner ring 11. Therefore, when the inner ring assembly As is supported with the large end face 11a of the inner ring 11 facing upwards, the fixing member 34 can be easily fixed to the large end face 11a of the inner ring 11.

[0063] The retainer segment 20 is made of polyether ether ketone reinforced with carbon fibers or polyether ether ketone reinforced with glass fibers. Because carbon fibers or glass fibers are fibrous, they can efficiently reduce the coefficient of thermal expansion. Therefore, it is possible to prevent the circumferential gap between segments from becoming zero when the retainer segment 20 expands.

[0064] If the assembly member 36 and the fixing member 34 are made of steel, when the assembly jig AJ is assembled into a ring shape, the rigidity of the assembly jig AJ can be increased, and the workability when attaching and detaching the assembly jig AJ to the inner ring 11 can be further improved. If the fall prevention member 33 in Figure 3 is made of resin, it is possible to prevent unwanted scratches on the rolling surface of the tapered roller 15 when the fall prevention member 33 is brought into contact with the tapered roller 15.

[0065] <Regarding other embodiments> In the following description, parts corresponding to matters previously described in each embodiment will be denoted by the same reference numerals, and redundant explanations will be omitted. When only a part of the configuration is described, the other parts of the configuration will be the same as those in the previously described embodiment unless otherwise specified. Identical configurations will produce the same effects. Not only are combinations of the parts specifically described in each embodiment possible, but partial combinations of embodiments are also possible, provided that there are no particular problems with the combination.

[0066] [Second Embodiment] As shown in Figure 13, stepped surfaces 36d may be provided at both longitudinal ends of the assembly member 36, allowing adjacent assembly members 36, 36 in the circumferential direction to overlap and be connected by bolts or the like. With this assembly jig AJ, the aforementioned fastening member body 35a (Figure 8) can be omitted. This configuration makes it possible to reduce the number of parts and simplify the structure compared to the first embodiment.

[0067] <Other> The assembly member 36 and fixing member 34 shown in Figure 9 may be made of a non-ferrous metal such as aluminum or resin. The fall prevention member 33 may be made of a non-ferrous metal or steel. As the engaged portion Hk of segment 20, a groove extending circumferentially may be provided on the large-diameter side surface of the large-diameter side arc-shaped portion 22, and as the engaged portion Kg of the assembly member 36, a rectangular plate-shaped member that engages with the groove of segment 20 may be applied.

[0068] <Examples of application to wind power generation equipment> Figure 14 shows an example of a wind power generation device using a tapered roller bearing 1 according to one of the embodiments. In this wind power generation device, the main shaft 53 of a propeller-type wind turbine 52 is rotatably supported by a tapered roller bearing 1, which is the main shaft bearing, in a nacelle 51 that is installed horizontally rotatably at the upper end of a support column 50. The main shaft bearing is a large bearing with an outer diameter of 1 m or more. The main shaft 53 is connected to a generator 54 via a speed increaser 55. In this wind power generation device, a tapered roller bearing 1 according to one of the embodiments is used as the main shaft bearing.

[0069] In this case, the tapered roller bearing 1, which has excellent assembly properties, can be applied to large bearings used in wind power generation equipment, thereby reducing the labor costs and maintenance costs of the tapered roller bearing 1.

[0070] A tapered roller bearing 1 according to any embodiment may be applied to a bearing with an outer diameter of less than 1 m. The tapered roller bearing 1 may also be applied to applications other than wind power generation equipment.

[0071] While embodiments for carrying out the present invention have been described above based on the embodiments, the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0072] 1... Tapered roller bearing 11…Inner circle 12…Outer ring 15... Circle water droplet 15a...corner 17...Cage 20… Retainer segment 21…Small diameter side arcuate part 22...Large diameter side arc-shaped section 23...Column part 24a...First guide claw 24b...Second guide claw 32…Assembly jig body 33... Anti-detachment component 34… Fixing member 35… Fastening member AJ... Assembly jig Hk...Engaged part Kg…Engagement part

Claims

1. The device comprises an inner ring, an outer ring, a plurality of tapered rollers interposed between the inner and outer rings, and a retainer that holds the tapered rollers, wherein the retainer is constructed by arranging a plurality of retainer segments in the circumferential direction, and the retainer segments have a plurality of pockets arranged in the circumferential direction for housing the tapered rollers. The cage segment has a large-diameter side arc-shaped portion and a small-diameter side arc-shaped portion extending in the circumferential direction, and a plurality of columnar portions connecting these large-diameter and small-diameter side arc-shaped portions, and the pocket is formed by the large-diameter side arc-shaped portion, the small-diameter side arc-shaped portion and the columnar portions, in a tapered roller bearing, A ring-shaped assembly jig that restricts the movement of the plurality of retainer segments toward the outer diameter is detachably provided on the inner ring, The aforementioned assembly jig is A ring-shaped assembly jig body including an engaging portion that detachably engages with the engaged portion provided on the large-diameter side arc-shaped portion, A member is provided that extends axially from the main body of this assembly jig and prevents the tapered roller from falling out toward the outer diameter side of the retainer segment, which is permitted to be pulled out toward the outer diameter side. A tapered roller bearing having [a specific feature / feature].

2. A tapered roller bearing according to claim 1, wherein the engaged portion is a plate-shaped protruding plate portion that protrudes axially from the large-diameter side surface of the large-diameter side arc-shaped portion and extends along the circumferential direction.

3. In the tapered roller bearing according to claim 1 or claim 2, the cage segment has a pocket having a first guide claw extending inward from the column portion, and a pocket having a second guide claw extending outward from the column portion, and the inner circumferential surfaces of the first and second guide claws have an R shape that conforms to the outer circumferential surface of the tapered roller. The anti-detachment member is a tapered roller bearing that prevents the tapered roller housed in the pocket having the first guide claw from falling out toward the outer diameter side.

4. A tapered roller bearing according to claim 1 or claim 2, wherein the assembly jig comprises a plurality of parts that are circumferentially separable.

5. In the tapered roller bearing according to claim 2, the assembly jig body includes a plurality of assembly members that can be divided in the circumferential direction, The aforementioned assembly jig is The plurality of assembly members, including the engagement portion that engages with the outer diameter side engagement surface and the inner diameter side engagement surface of the protruding plate portion, Multiple fixing members connect these assembly members to the inner ring and are detachably fixed to the inner ring, A tapered roller bearing having a plurality of the aforementioned anti-detachment members.

6. A tapered roller bearing according to claim 5, wherein the assembly jig has fastening members for fastening adjacent assembly members in the circumferential direction.

7. A tapered roller bearing according to claim 5 or claim 6, wherein the anti-detachment member is fixed to the assembly member, extends toward the smaller diameter side in the axial direction of the tapered roller bearing, and contacts the larger diameter corner of the tapered roller which is permitted to be pulled out toward the outer diameter side.

8. A tapered roller bearing according to claim 5 or claim 6, wherein the fixing member is a tapered roller bearing that is detachably fixed to the large-diameter side surface of the inner ring.

9. A tapered roller bearing according to claim 5 or claim 6, wherein the assembly jig can be inserted into the tapered roller bearing from the larger diameter side of the bearing, and the assembly jig can be fixed to the tapered roller bearing by fixing the fixing member and the inner ring.

10. A tapered roller bearing according to claim 1 or claim 2, wherein the diameter of the small flange of the inner ring is M, the angle of the small flange with respect to a straight line perpendicular to the central axis of the inner ring is L, the chamfer width of the tip of the small flange is K, and the distance from the contact point C where the side surface of the small flange and the small diameter end face of the tapered roller come into contact with each other to the central axis is y3, and the tapered roller bearing satisfies the following conditions. (M / 2)-K cosL>y3

11. A tapered roller bearing according to claim 1 or 2, wherein the tapered roller bearing is a large bearing with an outer diameter of 1 m or more used in a wind power generation device.

12. An assembly jig for a tapered roller bearing comprising a cage having multiple cage segments arranged circumferentially, wherein each cage segment has a large-diameter arc-shaped portion and a small-diameter arc-shaped portion extending in the circumferential direction, and multiple columnar portions connecting these large-diameter and small-diameter arc-shaped portions, A ring-shaped assembly jig body including an engaging portion that detachably engages with the engaged portion provided on the large-diameter side arc-shaped portion, A member is provided that extends axially from the main body of this assembly jig and prevents the tapered rollers in the retainer segment from falling out toward the outer diameter, which are permitted to be pulled out toward the outer diameter. An assembly jig having a fixing member that connects the assembly jig body and the inner ring of a tapered roller bearing, and that is detachably fixed to the inner ring.

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