WO2022244872A1

WO2022244872A1 - Tapered roller bearing

Info

Publication number: WO2022244872A1
Application number: PCT/JP2022/020981
Authority: WO
Inventors: 雄太西田; 智仁伊藤; 靖之井上; 径生堀; 翔吾福留
Original assignee: Ntn株式会社
Priority date: 2021-05-20
Filing date: 2022-05-20
Publication date: 2022-11-24
Also published as: JP2022179448A

Abstract

Provided is a tapered roller bearing having a structure such that when incorporating an inner ring assembly into an outer ring, even if the inner ring assembly is reversed, segments in a segment holder will not scatter, and tapered rollers will not fall out of pockets in the segments. The pockets 16 positioned at the ends in the circumferential direction among the pockets 16 respectively accommodating the tapered rollers 15 , are provided with guide claws 24 on the outer diameter side of opposing column sections such that the respective tapered rollers 15 can be inserted from the inner diameter side. The pockets 16 positioned at the ends in the circumferential direction are provided with guide claws 24 on the inner diameter side of the opposing column sections 23 such that the respective tapered rollers 15 can be inserted from the outer diameter side. Fall prevention members 32, which prevent the tapered rollers 15 respectively accommodated in the pockets 16 at both ends from falling to the outer diameter side, are provided so as to be able to be inserted and removed from the large-end-surface side of an inner ring 11. A connection member 25 to be wound around the large diameter side of each of the segments 20 arranged in a ring shape is passed through engagement parts 27 on the large-diameter-side side surface of a large-diameter-side arcuate section 22 of each of the segments 20, and is fixed thereto.

Description

tapered roller bearing

The present invention relates to tapered roller bearings used in general industrial machinery, and more particularly to tapered roller bearings that rotatably support large rotating shafts such as the main shafts of wind power generators with an outer diameter exceeding 1 m.

As shown in the cross-sectional view of FIG. 24, the tapered roller bearing 100 includes an inner ring 101, an outer ring 102 arranged concentrically around the outer circumference, and tapered rollers arranged between the inner ring 101 and the outer ring 102. 103 and a retainer 104 that retains the tapered rollers 103 at regular intervals in the circumferential direction.

The retainer 104 of the tapered roller bearing 100 is generally made of steel plate. In the case of a large tapered roller bearing 100 such as that used in a wind power generator, the steel plate retainer 104 deforms due to its own weight and the weight of the tapered rollers 103 held because the tapered rollers 103 are also large and used in large numbers. Sometimes. Further, the retainer 104 made of steel plate is usually manufactured by press working, but if the outer diameter exceeds 1 m, it becomes difficult to process due to equipment problems. Further, even if the strength of the retainer 104 made of steel plate can be ensured by increasing the plate thickness, it is generally difficult to press large parts due to problems with the manufacturing equipment, and processing is limited. There is a limit to the plate thickness that can be pressed from. On the other hand, if the retainer 104 is manufactured by cutting, the cost will increase significantly compared to the press product, and the material will be wasted.

In order to solve these problems, there is a segmented retainer in which the retainer 104 is divided into a plurality of segments 104A as shown in FIG. Resin-made cages have become mainstream as the segment cages.

By the way, when the single-row tapered roller bearing 100 is incorporated into a wind turbine, for example, as shown in FIG. are incorporated into the outer ring 102 in an inverted state with the small diameter side facing downward.

However, in the case of a segment retainer in which a plurality of segments 104A are combined as shown in FIG. 25, each segment 104A is separated when the inner ring assembly is reversed. In order to prevent the segments 104A from coming apart, it has been proposed to tie the outer periphery of the annularly arranged segments 104A with a wire or the like to integrate the annularly arranged segments 104A (Patent Documents 2 to 4). ).

Japanese Patent No. 5010353 JP 2014-20393 A Japanese Patent No. 5702534 JP 2018-80747 A

A conventional segment retainer combining segments 104A shown in FIG. The tapered rollers 103 are inserted into the pockets of the segment 104A from the inner diameter side and the outer diameter side. .

Therefore, even if the annularly arranged segments 104A are tied together by a wire or the like, when the inner ring assembly is reversed, the tapered rollers 103 inserted from the inner diameter side are prevented from falling off by the guide claws 105 on the outer diameter side. However, since the tapered roller 103 inserted from the outer diameter side has the guide claw 106 on the inner diameter side, it falls off. Therefore, there is a problem that it takes time and effort to assemble.

Also, even after the inner ring assembly is incorporated into the outer ring 102, if the connecting members such as wires that integrate the segments are left as they are, the connecting members may come off during operation of the tapered roller bearing 100, leading to failure. have a nature.

SUMMARY OF THE INVENTION Accordingly, the present invention prevents segments of a segment retainer from coming apart and tapered rollers from falling out of pockets of the segments even when the inner ring assembly is reversed when the inner ring assembly is incorporated into the outer ring. To provide a tapered roller bearing in which a connecting member that integrates segments can be removed after an assembly is built into an outer ring.

In order to solve the above problems, the present invention provides an inner ring, an outer ring arranged concentrically on the outer periphery thereof, a plurality of tapered rollers arranged between the inner ring and the outer ring, and tapered rollers held at regular intervals. The inner ring has a raceway surface on which the tapered rollers roll on the outer circumference, and a large flange portion and a small flange portion with which the end surfaces of the tapered rollers contact on both sides in the axial direction sandwiching the raceway surface. The cage is a segmented cage divided into a plurality of segments in the circumferential direction, and the segments are composed of a pair of small diameter side arcuate portions and large diameter side arcuate portions that are opposed to each other with a predetermined spacing, and the small diameter side and a plurality of columns extending between the arc-shaped portion and the large-diameter side arc-shaped portion. In a tapered roller bearing assembled into an outer ring in the state of an inner ring assembly in which an inner ring, tapered rollers and a cage are integrated, each segment has at least three pockets in the circumferential direction, and each segment has at least three pockets in the circumferential direction. Pockets located at positions other than the ends are provided with guide claws on the outer diameter side of the opposing pillars so that the tapered rollers can be inserted into the pockets from the inner diameter side of the segment. A guide pawl is provided on the inner diameter side of the column to allow the tapered rollers to be inserted into the pocket from the outer diameter side, and a drop-off prevention member is provided to prevent the tapered rollers accommodated in the pockets at both ends from falling off to the outer diameter side. a connecting member and an engaging portion for the connecting member are provided on the large-diameter side surface of the large-diameter arc-shaped portion of the segment; and the connecting member is detachably attached to the engaging portion. It is characterized by connecting each segment arranged annularly by engaging.

The fall-off prevention members are provided along the outer diameter surfaces of the pillars located at both ends of the segment, and are detachably fixed.

In addition, a drop-off prevention member fixing portion that allows the drop-off prevention member to be axially attachable and detachable is provided near the circumferential end portion of the outer diameter surface of at least one of the small-diameter side arc-shaped portion and the large-diameter side arc-shaped portion of the segment.

The fall-off prevention member is inserted into the fall-off prevention member fixing portion from the inner ring large end surface side, and the fall-off prevention member has a structure engaging with the inner ring big end surface. The portion is provided with a guide portion for the connecting member.

The drop-off prevention member fixing portions are formed in a groove shape that opens toward adjacent segments, and one drop-off prevention member fixing portion is common to the opposing groove-shaped drop-off prevention member fixing portions of the adjacent segments. The prevention member may prevent the tapered rollers accommodated in the pockets at both ends of the adjacent segments from coming off toward the outer diameter side.

The ends of the connecting member are connected by a fastening portion or a fastening member. A wing portion protruding toward the small diameter side is provided on the small diameter side surface of the small diameter arcuate portion, and when the large diameter sides of the annularly arranged segments are connected by a connection member, the small diameter side of each annularly arranged segment is provided with a wing portion that protrudes toward the small diameter side. It is preferable to fit an annular jig to the wing portion.

It is preferable to provide protrusions having the engaging portions on both end sides of the large-diameter side surface of the segment's large-diameter arc-shaped portion.

With the tapered rollers arranged on the raceway surface of the inner ring with the large end surface of the inner ring facing downward, the angle of the large flange portion of the inner ring that contacts the large diameter side end surface of the tapered roller with respect to the straight line orthogonal to the central axis of the inner ring is I, the chamfered width of the tip of the large flange is H, the distance from the central axis of the inner ring to the center of gravity of the tapered roller is y1, and the diameter of the large flange is J, the diameter of the large flange is should satisfy the following conditions:

(J/2)-H cos I > y1

The diameter of the small flange portion of the inner ring is M, and the small flange portion of the inner ring that contacts the small diameter side end surface of the tapered roller is the center of the inner ring in a state in which the adjacent segments are connected by the connecting member and abutted against each other and fixed. The angle with respect to a straight line perpendicular to the axis is L, the chamfer width of the tip of the small flange is K, and when the tapered roller is rotated around the tip of the large flange of the inner ring, the side surface of the small flange and The height of the small flange satisfies the following condition, where y3 is the distance from the contact point C where the tapered roller contacts the small-diameter end face to the central axis.

(M/2)-KcosL>y3

The annular jig can be removed before the inner ring assembly, which integrates the inner ring, tapered rollers and retainer, is assembled into the outer ring.

It is preferable to remove the connecting member and the drop-off prevention member after the inner ring assembly is incorporated into the outer ring.

Also, when a plurality of segments are arranged in the circumferential direction without gaps, there is a gap between the first arranged segment and the last arranged segment. Here, at room temperature, the circumferential dimension of the gap is less than 0.12% of the circumference of the circle passing through the center of the cage segment. In addition, the first segment means the segment that is arranged first when a plurality of segments are sequentially arranged in a row in the circumferential direction, and the last segment means that the adjacent segments are brought into contact and sequentially arranged in the circumferential direction. This is the segment that is arranged last when arranged in a row. A plurality of retainer segments are connected in the circumferential direction and incorporated into the tapered roller bearing to form one annular retainer.

The segments are made of resin. The linear expansion coefficient of the resin is 1.7×10 ⁻⁵ /° C. or less.

As the resin forming the segments, polyether ether ketone containing carbon fiber, glass fiber, or carbon black as a filler can be used. The filling ratio of the filler in the resin is 20% by weight or more and 40% by weight or less, and the gap in the circumferential direction between the segments is within the range described above. , deformation or the like due to tension between the segments in the circumferential direction can be prevented.

The connecting member may be divided into a plurality of parts, and the ends of each divided connecting member may be connected by the fastening portion or the fastening member. It is preferable that the plurality of fastening portions or fastening members are equally spaced in a circumferential manner.

A small-diameter side connecting member and a small-diameter side engaging portion for the small-diameter side connecting member are provided on the small-diameter side surface of the small-diameter arc-shaped portion, and the small-diameter side connecting member is detachably engaged with the small-diameter side engaging portion. You may make it connect each segment arrange|positioned cyclically|annularly by doing.

In the tapered roller bearing according to the present invention, when the inner ring assembly in which the inner ring, the tapered rollers, and the retainer are integrated is incorporated into the outer ring, even if the inner ring assembly is reversed, the large diameter sides of the annularly arranged segments are connected. Since each segment is connected by a member, it does not come apart.

In addition, among the pockets for storing tapered rollers, the pockets located at positions other than the ends in the circumferential direction of each segment are provided with guide claws on the outer diameter side of the column portion, and the tapered rollers are inserted into the pocket from the inner diameter side of the segment. Therefore, even if the inner ring assembly is reversed, the tapered rollers will not fall out of the pocket.

Among the pockets for accommodating the tapered rollers, the pockets positioned at the ends in the circumferential direction of each segment are provided with guide claws on the inner diameter side of the opposing pillars so that the tapered rollers can be inserted into the pocket from the outer diameter side. However, fall-off prevention members for preventing the tapered rollers housed in the pockets at both ends from falling out toward the outer diameter side are provided on the outer diameter surfaces of at least one of the small-diameter side arc-shaped portion and the large-diameter side arc-shaped portion at both circumferential ends. Since it is provided along the outer diameter surface of the column portion located at both ends of the segment so that it can be inserted into and pulled out from the inner ring large end surface side of the provided drop-off prevention member fixing portion, it is accommodated in the pocket located at both ends of the segment. The tapered rollers are prevented from falling off by the falling-off prevention member even if the inner ring assembly is reversed. In addition, since the pocket positioned at the end portion is provided with guide claws on the inner diameter side of the opposing column portion, the segment retainer serves as a rolling element guide.

To suppress the opening of the small diameter side of each segment by fitting an annular jig to the wing portion on the small diameter side of each annularly arranged segment when tightening the large diameter side of each annularly arranged segment with a connecting member. can be done.

The connecting member on the large diameter side of each segment arranged in an annular shape is connected by a fastening portion or a fastening member. It can be removed, and it is possible to prevent the connecting member from coming off during operation and causing a failure.

Fall-off prevention members for preventing the tapered rollers accommodated in the pockets at both ends from falling off toward the outer diameter side are also provided on the outer diameter surfaces of at least one of the small-diameter side arc-shaped portion and the large-diameter side arc-shaped portion on both circumferential ends. Since it is provided so that it can be inserted into and pulled out from the large end face of the inner ring with respect to the fixing portion of the preventing member, the inner ring assembly can be pulled out after being incorporated into the outer ring.

1 is a cross-sectional view showing an embodiment of a tapered roller bearing according to the present invention; FIG. FIG. 2 is a plan view showing segments of a segment retainer used in the tapered roller bearing of FIG. 1; FIG. 2 is a perspective view showing segments of a segment retainer used in the tapered roller bearing of FIG. 1; FIG. 2 is a cross-sectional view of a segment of a segment cage used in the tapered roller bearing of FIG. 1; FIG. 3 is a cross-sectional view showing another example of segments of a segment retainer used in the tapered roller bearing of FIG. 1; 2 is a perspective view showing a state in which an outer ring of the tapered roller bearing of FIG. 1 is removed; FIG. 2 is a front view of the tapered roller bearing of FIG. 1 with the outer ring removed; FIG. FIG. 3 is a perspective view showing the direction in which tapered rollers are inserted into the segment of FIG. 2; FIG. 2 is a perspective view showing an assembly procedure of the tapered roller bearing of FIG. 1; FIG. 10 is a perspective view of the assembling procedure of FIG. 9 as seen from another angle; FIG. 2 is a perspective view showing an inserting direction of a drop-off preventing member in an assembling procedure of the tapered roller bearing of FIG. 1; FIG. 12 is a perspective view showing a state in which the anti-falling member is inserted from the state shown in FIG. 11; FIG. 5 is a schematic diagram showing the relationship between the tapered rollers and the large flange portion of the inner ring when the tapered rollers are arranged on the inner ring with the large end surface of the inner ring facing downward. FIG. 3 is a partial perspective view showing a state before binding of connecting members in the procedure for assembling the tapered roller bearing of FIG. 1 ; FIG. 3 is a partial perspective view showing a state after binding connecting members in the procedure for assembling the tapered roller bearing of FIG. 1 ; FIG. 16 is a cross-sectional view of FIG. 15; FIG. 17 is a cross-sectional view of the state of FIG. 16 with the annular jig removed; FIG. 5 is a cross-sectional view showing a state in which the inner ring assembly is reversed and incorporated into the outer ring; FIG. 4 is a cross-sectional view showing a state in which the inner ring assembly is incorporated into the outer ring; FIG. 4 is a schematic diagram showing a rotating state of tapered rollers arranged on the raceway surface of the inner ring; FIG. 5 is a schematic diagram showing the relationship between the height of the small flange portion of the inner ring and the tapered rollers when the tapered rollers arranged on the raceway surface of the inner ring are rotated. FIG. 5 is a cross-sectional view showing another embodiment of a tapered roller bearing according to the present invention; FIG. 4 is a perspective view showing another embodiment of a tapered roller bearing according to the present invention; FIG. 2 is a cross-sectional view of a conventional tapered roller bearing; FIG. 10 is a perspective view showing a state in which tapered rollers are inserted into segments that constitute retainer segments used in a conventional tapered roller bearing. It is a sectional view showing an assembly procedure of a conventional tapered roller bearing.

Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

A tapered roller bearing 1 according to this embodiment, as shown in FIG. It has rollers 15 and a retainer 17 having pockets 16 that retain the tapered rollers 15 at regular intervals.

The outer ring 12 has a raceway surface 14 on which the tapered rollers 15 roll on its inner circumference.

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

In the case of the large tapered roller bearing 1 used for supporting the main shaft of wind power generation, etc., the average diameter of the tapered rollers 15 is 40 mm or more, and the outer diameter of the bearing is 1 m or more.

The retainer 17 is a segmented retainer consisting of a plurality of segments 20, as shown in FIG.

As shown in FIGS. 2 to 4, the segment 20 includes a pair of small-diameter arcuate portion 21 and large-diameter arcuate portion 22 facing each other with a predetermined distance therebetween, and the small-diameter arcuate portion 21 and large-diameter arcuate portion 22. A space surrounded by two adjacent pillars 23, a small-diameter arc-shaped portion 21, and a large-diameter arc-shaped portion 22 is defined as a pocket 16 for accommodating the tapered rollers 15. I have to.

Three or more pockets 16 for accommodating tapered rollers 15 are provided in one segment 20 in the circumferential direction. In this embodiment, six pillars 23 are provided in one segment 20, and five pockets 16 for accommodating tapered rollers 15 are provided between adjacent pillars 23. As shown in FIG.

Out of the five pockets 16, pockets 16 positioned other than the ends in the circumferential direction. A guide pawl 24 is provided to prevent the tapered roller 15 from coming out radially, so that the tapered roller 15 can be inserted into the pocket 16 from the radially inner side of the segment 20 as shown in FIG.

The pockets 16 located at the ends in the circumferential direction are provided with guide claws 24 on the inner diameter side of the facing column portions 23 to allow the tapered rollers 15 to be inserted into the pocket from the outer diameter side, and are accommodated in the pockets 16 at both ends. The falling off of the tapered rollers 15 toward the outer diameter side is prevented by the falling-off prevention members 32 provided along the outer diameter surfaces of the column portions 23 positioned at both ends of the segment 20 . The drop-off prevention member 32 can be inserted into and removed from the drop-off prevention member fixing portions 33 provided on the outer diameter surfaces of both circumferential ends of the small-diameter side arc-shaped portion 21 and the large-diameter side arc-shaped portion 22 from the large end surface side of the inner ring 11 . ing.

Of the pockets 16 for accommodating the tapered rollers 15, the pocket 16 positioned at the end in the circumferential direction is provided with a guide claw 24 on the inner diameter side of the column portion 23. The tapered rollers 15 make the cage 17 a rolling element guide.

At the large end surface side end of the inner ring 11 of the drop-off preventing member 32, a drop-off preventing member fixing portion 33 is provided in which the drop-off preventing member 32 is provided on both outer diameter surfaces of the small diameter side arc-shaped portion 21 and the large diameter side arc-shaped portion 22. A structural portion 34 is provided that engages with the large end surface of the inner ring 11 in a state where it is inserted from the large end surface side of the inner ring 11 .

The surface of the drop-off prevention member 32 that contacts the tapered rollers 15 is formed as an R surface.

The drop-off prevention member fixing portions 33 provided on the outer diameter surfaces on both end sides of the small diameter side arc-shaped portion 21 and the large diameter side arc-shaped portion 22 are holes through which the drop-off prevention member fixing portions 33 are inserted, as shown in FIGS. 5, it may be formed in a groove shape opening toward the adjacent segments 20, as shown in FIG. When the drop-off prevention member fixing portions 33 are formed in groove shapes that are open to each other as shown in FIG. The drop-off prevention member 32 is inserted, and this one common drop-off prevention member 32 can prevent the tapered rollers 15 accommodated in the pockets 16 at both ends of the adjacent segments 20 from falling off toward the outer diameter side. This will reduce the number of parts.

The segment 20 is annularly arranged with the end faces of the small-diameter arcuate portion 21 and the large-diameter arcuate portion 22 facing each other.

At both ends of the large-diameter side surface of the large-diameter arc-shaped portion 22 of the segment 20, a projecting portion 26 having an engaging portion 27 of a connecting member 25 arranged on the large-diameter side of each segment 20 arranged in an annular shape is provided as a shaft. It is provided so as to protrude in the direction. The protrusions 26 on both ends of the large-diameter side surfaces of the large-diameter arc-shaped portions 22 of the segments 20 are preferably provided so as to avoid contact between the protrusions 26 between adjacent segments 20 .

A connecting member 25 wound around the large diameter side of each segment 20 arranged in an annular fashion engages with the large diameter side surface of the structural portion 34 that engages the large end surface of the inner ring of the drop-off prevention member 32 as well. A groove-shaped guide portion 35 is provided.

A wing portion 28 projecting toward the small diameter side is provided on the small diameter side surface of the small diameter arc portion 21 of the segment 20, and when the large diameter sides of the segments 20 arranged in an annular shape are bound by the connecting member 25, the wing portion 28 shown in FIG. And as shown in FIG. 16, an annular jig 31 is fitted to the wing portion 28 on the small diameter side of each segment 20 arranged in an annular shape to suppress the widening of the small diameter side of the segment 20 due to tightening of the connecting member 25 .

As shown in FIG. 16, the annular jig 31 includes a ring portion 31a that abuts against the end surface of the inner ring 11 on the small diameter side, and a ring portion 31a that protrudes toward the outer diameter side from the axial end portion of the ring portion 31a. The engaging portion 31b is fitted to the wing portion 28 of the segment 20 while the ring portion 31a is in contact with the end face of the inner ring 11 on the small diameter side.

The end of the connecting member 25 wound around the large diameter side of each segment 20 is bound by a fastening member 30 such as a turnbuckle. When the fastening member 30 is composed of a turnbuckle, it has a body portion having a female threaded portion, and by screwing the male threaded portion provided at the end of the connecting member 25 into the body portion of the turnbuckle, the connecting member 25 is tightened. The ends can be connected to each other. By rotating the body of the turnbuckle, tension can be applied to the connecting member 25, and by rotating the body in the direction opposite to the tightening direction, the binding of both ends of the connecting member 25 can be released.

A wire or belt can be used as the connecting member 25 . When a wire is used as the connecting member 25, a detachable hook or turnbuckle can be used as the fastening member 30. FIG. The turnbuckle is most preferable because it is detachable, the tightening force does not loosen, and the tightening force is adjustable. When a belt is used as the connecting member 25, it is preferable to use a detachable buckle as the fastening member 30 because the tightening force does not loosen.

The segment 20 is made of resin or steel. As the resin forming the segment 20, polyetheretherketone containing carbon fiber or polyetheretherketone containing glass fiber can be used.

　The tapered roller bearing 1 using the segment 20 is assembled as follows.

First, before incorporating into the outer ring 2, as shown in FIGS. 6 and 7, an inner ring assembly integrating the inner ring 11, tapered rollers 15 and cage 17 is assembled.

To assemble this inner ring assembly, first, as shown in FIGS. 9 and 10, with the large end face of the inner ring 11 facing downward, the tapered rollers 15 that fit into the three central pockets 16 of the segment 20 are inserted into the inner ring 11. are arranged on the raceway surface 13 of .

If the tapered rollers 15 are placed on the raceway surface 13 with the large end surface of the inner ring 11 facing downward, the tapered rollers 15 may fall off the inner ring 11 due to their own weight. In order to prevent the tapered rollers 15 from falling off from the inner ring 11 , the distance from the central axis of the inner ring 11 to the tip of the large flange portion 19 is made larger than the distance from the central axis of the inner ring 11 to the center of gravity of the tapered rollers 15 . , and the diameter J of the large collar portion 19 satisfies the following equation.

(J/2)-H cos I > y1

That is, as shown in FIG. 13, in a state in which the tapered rollers 15 are arranged on the raceway surface 13 of the inner ring 11 with the large end surface of the inner ring 11 facing downward, the side surface of the large flange portion 19 of the inner ring 11 that contacts the tapered rollers 15 is The angle with respect to a straight line perpendicular to the central axis of the inner ring 11 is I, the chamfered width of the tip of the large flange portion 19 is H, the distance from the central axis of the inner ring 11 to the center of gravity of the tapered roller 15 is y1, and the diameter of the large flange portion 19 is y1. If the above formula is satisfied, where J is the diameter, the tapered rollers 15 can be prevented from coming off. 13, D is the diameter of the large end surface of the tapered roller 15, G is the diameter of the small end surface of the tapered roller 15, F is the length of the tapered roller 15, and E is the large collar portion 19 extending from the central axis to the raceway surface 13. It shows the distance to the edge of the side.

As shown in FIG. 8, the tapered rollers 15 are previously inserted into the pockets 16 positioned at the ends of the segment 20 from the outer diameter side, and the segment 20 is inserted into the tapered rollers 15 as shown in FIGS. tapered rollers 15 are inserted into the three central pockets 16 from the inner diameter side of the segment 20. As shown in FIG.

After that, as shown in FIGS. 11 and 12, the falling prevention members 32 for preventing the tapered rollers 15 housed in the pockets 16 at both ends of the segment 20 from falling toward the outer diameter side are attached to the small diameter side arcuate portion 21 and the large diameter side arcuate portion 21 . A structural portion 34 that is inserted from the large end face side of the inner ring 11 into the stopper member fixing portion 33 provided on the outer diameter surface on both circumferential ends of the side arc portion 22 and engages the large end face of the inner ring of the stopper member 32 . is engaged with the large end face of the inner ring 11 .

Next, as shown in FIG. 16, an L-shaped annular jig 31 is fitted to the wing portion 28 protruding from the small-diameter side surface of the segments 20 arranged in a ring shape, and the protruding portion 26 protruding from the large-diameter side surface is attached. The connecting member 25 is passed through the guide portion 35 of the structural portion 34 that engages with the engaging portion 27 and the large end surface of the inner ring, and the ends of the connecting member 25 wound around the outer diameter side of the segment 20 are connected to each other as a fastening portion or a fastening member. The segments 20 are bound by 30 and the connecting members 25 are tightened by the fastening portions or fastening members 30 to integrate the plurality of segments 20 arranged in an annular shape.

The fastening portion or fastening member 30 is positioned between the projections 26 projecting to both ends of the large diameter side surface of the large diameter side arc-shaped portion 22 , and the fastening portion or fastening member 30 is located between the projections 26 on both end sides. It has become a containment unit.

The connecting member 25 may be a single piece continuous in the circumferential direction, but it is divided into a plurality of pieces in the circumferential direction, and the ends of each of the divided connecting members 25 are bound together by fastening portions or fastening members 30, respectively. good too. When the connecting member 25 is divided into a plurality of pieces, it is preferable that the fastening portions or the fastening members 30 are equally divided in the circumference.

When the connecting member 25 is wound around the outer circumference of the annularly arranged segments 20 and the connecting member 25 is tightened by the fastening portion or the fastening member 30, the small diameter side of the annularly arranged segments 20 tends to open, so this opening is prevented. In order to suppress this, when the connecting member 25 is tightened, an L-shaped annular jig 31 is fitted to the wing portion 28 on the small diameter side of the annularly arranged segment 20 .

As shown in FIG. 16, the annular jig 31 is axially placed over the wing portions 28 of the small-diameter side arcuate portions 21 of the segments 20 arranged annularly. It can be removed by moving along (Fig. 17).

Next, as shown in FIG. 18, this inner ring assembly can be incorporated into the outer ring 12 by turning the inner ring assembly so that the smaller diameter side faces downward.

When the inner ring assembly is incorporated into the outer ring 12, even if the inner ring assembly is turned upside down with the small diameter side facing downward, the segments 20 arranged in an annular shape are connected by the connecting member 25 on the outer peripheral side. It will not fall apart.

Also, the tapered rollers 15 inserted into the pockets 16 of the segments 20 do not slip out of the pockets 16 at the three central locations due to the guide claws 24 provided on the outer diameter side of the pillars 23 . Moreover, the tapered rollers 16 inserted from the outer diameter side into the pockets 16 at the ends of the segments 20 are prevented from slipping out to the outer diameter side by the drop-off preventing member 32 .

The annular jig 31 used when assembling the inner ring assembly should be removed when incorporating it into the outer ring 12.

With the annular jig 31 removed, the segments 20 connected by the connecting member 25 were inserted and held in the pockets 16 of the segments 20 even when the inner ring assembly was turned upside down with the small diameter side facing downward. The tapered rollers 15 are fitted between the large flange portion 19 and the small flange portion 18 located on both axial sides of the raceway surface 13 of the inner ring 11 , and the tapered rollers 15 are hooked on the small flange portion 18 of the inner ring 11 . Therefore, each segment 20 is prevented from coming off.

The height of the small flange portion 18 of the inner ring 11 that prevents the segments 20 from coming off satisfies the following conditions.

When the tapered rollers 15 fitted between the large flange portion 19 and the small flange portion 18 of the inner ring 11 rotate, when the large end face of the tapered roller 15 is not in contact with the large flange portion 19, the schematic diagram of FIG. As shown in , it is considered that the tapered roller 15 rotates around the point A, and rotates around the point B when the large end face of the tapered roller 15 is in contact with the large flange portion 19 .

When the large end surface of the tapered roller 15 is in contact with the large flange portion 19 and rotates around the point B, as shown in the schematic diagram of FIG. Since the end face of the roller 15 on the small diameter side contacts the point C on the side surface of the small flange 18 , the rotation of the tapered roller 15 is suppressed and the tapered roller 15 is caught on the small flange 18 of the inner ring 11 .

As shown in FIG. 21, the point C on the side surface of the small flange portion 18 where the tapered roller 15 is hooked is a spline curve depicting the trajectory of the small end face corner portion of the tapered roller 15 when the tapered roller 15 rotates and the small flange. At this time, the diameter M of the small flange portion 18 of the inner ring 11 satisfies the following conditions.

(M/2)-KcosL>y3

Here, M is the diameter of the small flange portion 18 of the inner ring 11, L is the angle of the side surface of the small flange portion 18 of the inner ring 11 on the point C side with respect to the straight line perpendicular to the central axis of the inner ring 11, and L is the angle of the small flange portion 18. When the chamfer width of the tip is K, and the tapered rollers 15 are rotated about point B at the tip of the large flange portion 19 of the inner ring 11, the side surface of the small flange portion 18 and the end face of the tapered roller 15 on the small diameter side are aligned. The distance from the contact point C to the central axis is y3.

As described above, the tapered roller bearing 1 can be assembled as shown in FIG.

As shown in FIG. 19, when the assembly of the tapered roller bearing 1 is completed, the segments 20 will not come apart even if the connecting member 25 tightening the outer circumference of each segment 20 is removed by loosening the fastening portion or the fastening member 30. Therefore, the connecting member 25 can be removed after the tapered roller bearing 1 is installed in the device.

In addition, after the connecting member 25 is removed, the anti-falling member 32 can also be pulled out from the fixing portion 33 of the anti-falling member.

In the above-described embodiment, the wing portion 28 protruding toward the small diameter side is provided on the small diameter side surface of the small diameter arc portion 21, and when the large diameter sides of the segments 20 arranged in an annular shape are bound by the connecting member 25, they are formed into an annular shape. An L-shaped annular jig 31 is fitted to the wing portion on the small diameter side of each arranged segment 20. However, as in the embodiment shown in FIG. A small-diameter side engaging portion 36 is provided, and a connecting member 37 wound around the small-diameter side of each segment arranged in an annular shape is passed through the small-diameter side engaging portion 36, and the ends of the connecting member 37 are connected to each other as fastening portions or The annular jig 31 may not be used by detachably binding with a fastening member (not shown).

In the above embodiment, the structure 34 that engages the large end surface of the inner ring of the drop-off prevention member 32 has a groove shape in which the connecting member 25 that is wound around the large diameter side of each of the segments 20 that are arranged in an annular shape engages. Although the guide portion 35 is provided, the shape of this guide portion 35 may be a hole shape through which the connecting member 25 passes, as in the embodiment shown in FIG.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope.

1: Tapered Roller Bearing 11: Inner Ring 12: Outer Ring 13: Raceway Surface 14: Raceway Surface 15: Tapered Roller 16: Pocket 17: Cage 18: Small Flange 19: Large Flange 20: Segment 21: Small Diameter Side Arc 22 : Large-diameter side arc-shaped portion 23: Column portion 24: Guide claw 25: Connecting member 26: Protruding portion 27: Engaging portion 28: Wing portion 30: Fastening portion or fastening member 31: Annular jig 32: Drop-off prevention member 33: Fall-off prevention member fixing portion 34: Structural portion 35 that engages with the large end surface of the inner ring: Guide portion 36: Small diameter side engaging portion 37: Connecting member

Claims

An inner ring, an outer ring arranged concentrically on the outer circumference thereof, a plurality of tapered rollers arranged between the inner ring and the outer ring, and a retainer having pockets for holding the tapered rollers at regular intervals. , a raceway surface on which the tapered rollers roll on the outer periphery, and a large flange portion and a small flange portion with which the end surfaces of the tapered rollers contact on both sides in the axial direction sandwiching the raceway surface. It is a segment cage divided into a plurality of segments, and the segments are a pair of small-diameter side arc-shaped portion and large-diameter side arc-shaped portion that are opposed to each other with a predetermined interval, and between the small-diameter side arc-shaped portion and the large-diameter side arc-shaped portion. A space surrounded by two adjacent pillars, a small-diameter side arc-shaped part, and a large-diameter side arc-shaped part is used as a pocket for accommodating the tapered rollers, and the inner ring, the tapered rollers, and the retainer. In a tapered roller bearing incorporated in an outer ring in the state of an inner ring assembly integrated with (1), each segment has at least three pockets in the circumferential direction, and the pockets located other than the ends in the circumferential direction of each segment face each other. A guide claw is provided on the outer diameter side of the column so that the tapered roller can be inserted into the pocket from the inner diameter side of the segment. The tapered rollers can be inserted into the pockets from the outer diameter side, and drop-off prevention members are provided to prevent the tapered rollers accommodated in the pockets at both ends from falling off to the outer diameter side, and the drop-off prevention members are detachable. A connecting member and an engaging portion of the connecting member are provided on the large-diameter side surface of the segment's large-diameter arc-shaped portion, and the segments are annularly arranged by detachably engaging the connecting member with the engaging portion. A tapered roller bearing characterized by connecting
The tapered roller bearing according to claim 1, wherein the anti-falling member is provided along the outer diameter surface of the column portion located at each end of the segment, and is detachably fixed.
2. A drop-off preventing member fixing portion for axially attaching and detaching the drop-off preventing member is provided in the vicinity of the circumferential end portion of the outer diameter surface of at least one of the small-diameter side arc-shaped portion and the large-diameter side arc-shaped portion of the segment. Or the tapered roller bearing according to 2.
The fall-off prevention member is inserted into the fall-off prevention member fixing portion from the inner ring large end surface side, and the fall-off prevention member has a structure engaging with the inner ring big end surface. 4. The tapered roller bearing according to claim 3, wherein the portion is provided with a guide portion for the connecting member.
The drop-off prevention member fixing portions are formed in a groove shape that opens toward adjacent segments, and one drop-off prevention member fixing portion is common to the opposing groove-shaped drop-off prevention member fixing portions of the adjacent segments. 5. The tapered roller bearing according to claim 3, wherein the tapered rollers accommodated in the pockets at both ends of the adjacent segments are prevented from coming off toward the outer diameter side by the prevention member.
The tapered roller bearing according to any one of claims 1 to 5, characterized in that the ends of the connecting member are connected by a fastening portion or a fastening member.
A wing portion protruding toward the small diameter side is provided on the small diameter side surface of the small diameter arcuate portion, and when the large diameter sides of the annularly arranged segments are connected by a connection member, the small diameter side of each annularly arranged segment is provided with a wing portion that protrudes toward the small diameter side. The tapered roller bearing according to any one of claims 1 to 6, wherein an annular jig is fitted to the wing portion.
The tapered roller bearing according to any one of claims 1 to 6, characterized in that projecting portions having the engaging portions are provided on both end sides of the large-diameter side surface of the large-diameter arc-shaped portion of the segment.
With the tapered rollers arranged on the raceway surface of the inner ring with the large end surface of the inner ring facing down, the large flange portion of the inner ring that contacts the large diameter side end surface of the tapered roller is aligned with the straight line orthogonal to the central axis of the inner ring. The following conditions are satisfied where I is the angle, H is the chamfered width of the tip of the large flange portion, y1 is the distance from the central axis of the inner ring to the center of gravity of the tapered roller, and J is the diameter of the large flange portion. The tapered roller bearing according to any one of claims 1 to 8, characterized in that:
(J/2)-H cos I > y1
The diameter of the small flange portion of the inner ring is M, and the small flange portion of the inner ring that contacts the small diameter side end surface of the tapered roller is the center of the inner ring in a state in which the adjacent segments are connected by the connecting member and abutted against each other and fixed. The angle with respect to a straight line perpendicular to the axis is L, the chamfer width of the tip of the small flange is K, and when the tapered roller is rotated around the tip of the large flange of the inner ring, the side surface of the small flange and The tapered roller according to any one of claims 1 to 9, wherein the following condition is satisfied, where y3 is the distance from the contact point C at which the tapered roller comes into contact with the end face on the small diameter side to the central axis. bearing.
(M/2)-K cos L > y3
The tapered roller bearing according to claim 7, characterized in that the annular jig is removed before the inner ring assembly in which the inner ring, tapered rollers and cage are integrated is assembled into the outer ring.
The tapered roller bearing according to any one of claims 1 to 11, characterized in that the connecting member and the drop-off prevention member are removed after the inner ring assembly is incorporated into the outer ring.
The tapered roller bearing according to any one of claims 1 to 12, characterized in that said segments are made of resin.
14. The tapered roller bearing according to claim 13, wherein the resin forming the segments is carbon fiber-blended polyetheretherketone or glass fiber-blended polyetheretherketone.
The tapered roller bearing according to claim 6, wherein the connecting member is divided into a plurality of parts, and the ends of each divided connecting member are connected to each other by the fastening portion or the fastening member.
The tapered roller bearing according to claim 14, characterized in that the plurality of fastening portions or fastening members are equally spaced along the circumference.
A small-diameter side connecting member and a small-diameter side engaging portion for the small-diameter side connecting member are provided on the small-diameter side surface of the small-diameter arc-shaped portion, and the small-diameter side connecting member is detachably engaged with the small-diameter side engaging portion. 17. The tapered roller bearing according to any one of claims 1 to 16, wherein each segment arranged in an annular shape is connected by doing so.