Tapered roller bearing

Abstract

Provided is a tapered roller bearing in which an inner ring assembly is integrated by means of a connecting member such as a steel wire, and in which the connecting member can be detached after the bearing has been mounted, and in which roller guidance can be achieved. A tapered roller bearing (1) is provided with a detachable retaining member (32) for preventing a tapered roller (15) housed in a pocket (16) having a first guide claw extending toward the inner diameter side of a cage segment (20) from falling toward the outer diameter side. The retaining member (32) engages with the outer diameter surface and the large-diameter side surface of the large-diameter-side arc section (22) of the retainer segment (20). The retainer segment (20) and the anti-drop member (32) are connected by a connecting member (25).

Description

[0001] Related Applications

[0002] This application claims the priority of Japanese Patent Application No. 2022-185128 filed on November 18, 2022 and Japanese Patent Application No. 2023-180301 filed on October 19, 2023, and the entire disclosures of these applications are incorporated herein by reference in their entirety. Technical Field

[0003] The present invention relates to a tapered roller bearing for a main bearing of a wind power generation device or a tapered roller bearing for an industrial machine, particularly a large tapered roller bearing having an outer diameter exceeding 1 m. Background Art

[0004] Tapered roller bearings typically use a steel plate cage. The steel plate cage is manufactured by stamping, for example. However, for large cages with an outer diameter exceeding 1 m, stamping becomes difficult due to equipment limitations. On the other hand, cages manufactured by machining have a significantly higher cost compared to stamped products and also result in more waste in terms of material loss. To control costs, there are segmented cages in which multiple cage segments are molded by resin injection molding and then assembled (for example, Patent Document 1). In addition, it is difficult to mold a large integral ring exceeding 1 m in resin injection molding.

[0005] In the case of such a segmented cage, for example, when a single-row tapered roller bearing is installed in a wind turbine, there is a process of handling the inner ring assembly with the small end face facing down. At this time, to prevent the rollers from falling off the cage, a method has been devised in which the segmented cage is connected by a connecting member such as a wire to form a single unit (for example, Patent Documents 2 to 4).

[0006] [Prior Art Documents]

[0007] [Patent Documents]

[0008] Patent Document 1: Japanese Patent No. 4342512

[0009] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2011-137530

[0010] Patent Document 3: WO2013 / 092217

[0011] Patent Document 4: Japanese Unexamined Patent Application Publication No. 2018-080747 Summary of the Invention

[0012] [Problems to be Solved by the Invention]

[0013] With respect to such a segmented cage that is integrated by a wire, one problem is that when the wire is installed on the bearing, the wind turbine will operate. Even if the wire is removed after the wind turbine is assembled, the cage is guided by the rolling surfaces of the rollers and the raceway surfaces of the inner and outer rings, rather than by the rollers. Additionally, even if an existing "roller-guided segmented cage" that does not use a wire is connected by a wire to make it temporarily integrated, there is still a risk of the rollers falling off when the inner ring component is flipped. When the wind turbine is operated with the wire installed, there are concerns about wear caused by the wire, generation of abnormal noises, etc. Moreover, when the cage is guided by the raceway surface, there are also concerns about wear at the contact portion between the cage and the raceway surface and the raceway surface.

[0014] An object of the present invention is to provide a tapered roller bearing that can integrate an inner ring assembly by a connecting member such as a wire, and can also disassemble the connecting member after the bearing is installed, and can achieve roller guidance.

[0015] [Solution to the problem]

[0016] The tapered roller bearing of the present invention is the following tapered roller bearing, which includes a plurality of tapered rollers interposed between an inner ring and an outer ring, and a cage for holding the tapered rollers. The cage has a plurality of cage segments segmented in the circumferential direction, and these cage segments are connected by a detachable connecting member. Each cage segment has three or more pockets arranged in the circumferential direction for receiving the tapered rollers. Each cage segment has a large-diameter side arcuate portion and a small-diameter side arcuate portion extending in the circumferential direction, and a plurality of column portions connecting these large-diameter side and small-diameter side arcuate portions, and the pockets are formed by the large-diameter side arcuate portion, the small-diameter side arcuate portion, and the column portions. Each cage segment has a pocket having a first guide claw extending from the column portion toward the inner diameter side, and a pocket having a second guide claw extending from the column portion toward the outer diameter side. The tapered roller bearing further includes a detachable anti-drop-off member for preventing the tapered roller received in the pocket having the first guide claw from dropping off toward the outer diameter side. The anti-drop-off member engages with the outer diameter surface and the large-diameter side side surface of the large-diameter side arcuate portion of the cage segment. The cage segment and each anti-drop-off member are connected by the connecting member. The connecting member is, for example, a wire. The cage is, for example, a cage for a large tapered roller bearing with an outer diameter of 1 m or more.

[0017] According to this structure, since the connecting member and the anti-detachment member are detachable, even if the inner ring assembly is integrated by the connecting member and the anti-detachment member, the connecting member can be detached after the bearing is installed. In addition, the cage is guided only by the tapered rollers during operation through the first and second guiding claws, so that roller guidance can be achieved.

[0018] In the present invention, the anti-detachment member can also be inserted from the large end face side of the inner ring and arranged along the column portion or the second guiding claw. According to this structure, the anti-detachment member can suppress the radial movement of the tapered rollers.

[0019] In the present invention, at the circumferential end of the large-diameter side arc-shaped portion of the cage segment, an anti-detachment member guiding portion for restricting the circumferential movement of the anti-detachment member can also be provided. According to this structure, it is easier to install the anti-detachment member onto the cage segment and detach it from the cage segment.

[0020] In the present invention, the anti-detachment member can also have a guiding portion that engages with the connecting member. In this case, the guiding portion can be an insertion through-hole for the connecting member to be inserted or an engaging groove for the connecting member to engage. According to this structure, it is easier to integrate the cage segment and each anti-detachment member through the connecting member.

[0021] In the present invention, the anti-detachment member can also have an inner ring engaging portion that engages with the large end face of the inner ring. According to this structure, through the inner ring engaging portion, it is possible to prevent the cage segment from expanding on the small-diameter side due to the tightening of the connecting member.

[0022] In the present invention, on both ends of the large-diameter side side face of the large-diameter side arc-shaped portion of the cage segment, large-diameter side protruding portions having engaging portions that engage with the connecting member can also be provided. According to this structure, it is easier to integrate the cage segment and each anti-detachment member through the connecting member.

[0023] In the present invention, both ends of the connecting member can also be connected by a fastening portion or a fastening member. According to this structure, the handling of the connecting member will be easier.

[0024] In the present invention, the connecting member can also be divided into multiple parts, and the ends of each connecting member can be connected by a fastening portion or a fastening member. In this case, the multiple fastening portions or fastening members can be arranged at equal intervals in the circumferential direction. According to this structure, a fastening force can be evenly applied to the entire connecting member through the fastening portion or the fastening member.

[0025] In the present invention, on the small-diameter side surface of the small-diameter side arc-shaped portion of the retainer segment, a small-diameter side protrusion may further be provided, and the small-diameter side protrusion can be fitted with an annular clamp. According to this structure, the annular clamp can prevent the retainer segments arranged in a ring from expanding on the small-diameter side.

[0026] In the present invention, the retainer segment may be made of polyetheretherketone added with carbon fiber or polyetheretherketone added with glass fiber. Additionally, the anti-detachment member may be made of resin or metal.

[0027] In the present invention, in a state where the large end face of the inner ring is facing downwards and tapered rollers are placed on the raceway surface of the inner ring, when the angle formed by the large flange portion of the inner ring and a straight line perpendicular to the central axis of the inner ring is set as I, the chamfer width at the front end of the large flange portion is set as H, the distance from the central axis of the inner ring to the center of gravity of the tapered roller is set as y1, and the diameter of the large flange portion is set as J, the following condition may also be satisfied:

[0028] (J / 2) - H·cosI > y1

[0029] According to this structure, when installing the tapered rollers on the inner ring, the tapered rollers can be prevented from falling off due to their own weight.

[0030] In the present invention, in a state where the retainer segments are connected by the connecting member, when the diameter of the small flange portion of the inner ring is set as M, the angle formed by the small flange portion and a straight line perpendicular to the central axis of the inner ring is set as L, the chamfer width at the front end of the small flange portion is set as K, and when the tapered roller rotates with the front end of the large flange portion of the inner ring as the center, the distance from the contact point C where the side surface of the small flange portion contacts the small-diameter side end face of the tapered roller to the central axis is set as y3, the following condition may also be satisfied:

[0031] (M / 2) - K·cosL > y3

[0032] According to this structure, since the end face on the small-diameter side of the tapered roller contacts the contact point C on the side surface of the small flange portion, the rotation of the tapered roller can be suppressed.

[0033] In the present invention, on the small-diameter side surface of the small-diameter side arc-shaped portion of the retainer segment, a small-diameter side engaging portion may further be provided, and the small-diameter side engaging portion engages with a detachable small-diameter side connecting member. According to this structure, the small-diameter side connecting member can prevent the retainer segments arranged in a ring from expanding on the small-diameter side.

[0034] Any combination of at least two structures disclosed in the claims and / or the specification and / or the drawings is included in the present invention. In particular, any combination of more than two of the claims in the claims is also included in the present invention. Description of the Drawings

[0035] The present invention will be more clearly understood by reference to the following preferred embodiments with reference to the accompanying drawings. However, the embodiments and the drawings are only for illustration and explanation and should not be used to limit the scope of the present invention. The scope of the present invention is determined by the appended claims. In the drawings, the same reference numerals in multiple figures denote the same or corresponding parts.

[0036] Figure 1 is a cross-sectional view of a tapered roller bearing showing a first embodiment of the present invention.

[0037] Figure 2 is a front view of the inner ring assembly of the tapered roller bearing viewed axially.

[0038] Figure 3 is a perspective view of the inner ring assembly.

[0039] Figure 4 is a cross-sectional view of a cage segment of the cage of the tapered roller bearing.

[0040] Figure 5 is a top view of the cage segment viewed from the radially outer side.

[0041] Figure 6 is a perspective view of the cage segment.

[0042] Figure 7 is a perspective view of a modified example of an anti-drop-off member of the inner ring assembly.

[0043] Figure 8 is a perspective view of another modified example of an anti-drop-off member of the inner ring assembly.

[0044] Figure 9 is a perspective view of yet another modified example of an anti-drop-off member of the inner ring assembly.

[0045] Figure 10 is a cross-sectional view of the inner ring assembly using the anti-drop-off member.

[0046] Figure 11 is a cross-sectional view of the inner ring assembly using the anti-drop-off member.

[0047] Figure 12 is a cross-sectional view of the tapered roller bearing. ​​​​​​​​​​​​

[0048] Figure 13 is a schematic diagram showing the relationship between the tapered roller and the large flange portion of the inner ring when the tapered roller is arranged in the inner ring with the large end face of the inner ring facing downward.

[0049] Figure 14 is a perspective view showing the state of inserting the tapered roller into the cage segment.

[0050] Figure 15 is a perspective view showing the state of inserting the cage segment into the inner ring.

[0051] Figure 16 is a sectional view showing the state of inserting the cage segment into the inner ring.

[0052] Figure 17 is a perspective view showing the state of inserting the anti-drop-off component into the cage segment.

[0053] Figure 18 is a perspective view showing the state of arranging the cage segments in a ring shape.

[0054] Figure 19 is a perspective view showing the state of installing the ring-shaped fixture and the connecting component on the inner ring assembly.

[0055] Figure 20 is a schematic diagram showing the rotation state of the tapered roller disposed on the raceway surface of the inner ring.

[0056] Figure 21 is a schematic diagram showing the relationship between the height of the small flange portion of the inner ring and the tapered roller when the tapered roller disposed on the raceway surface of the inner ring rotates.

[0057] Figure 22 is a sectional view showing the state of installing the inner ring assembly onto the outer ring.

[0058] Figure 23 is a sectional view showing the state of installing the inner ring assembly onto the outer ring.

[0059] Figure 24 is a sectional view showing the tapered roller bearing according to the second embodiment of the present invention.

[0060] Figure 25 is showing Figure 24 the top view of the segment of the segmental cage used in the tapered roller bearing.

[0061] Figure 26 is showing Figure 24 the perspective view of the segment of the segmental cage used in the tapered roller bearing.

[0062] Figure 27 ​​​​​​​​​​​​​​​is Figure 24 A cross-sectional view of a segment of a segmented cage used in a tapered roller bearing.

[0063] Figure 28 represents Figure 24 Another example of a cross-sectional view of a segment of a segmented cage used in a tapered roller bearing.

[0064] Figure 29 represents the state after removing Figure 24 The outer ring of a tapered roller bearing, shown as a perspective view.

[0065] Figure 30 represents the front view of the state after removing Figure 24 The outer ring of a tapered roller bearing.

[0066] Figure 31 represents a cross-sectional view of the state after bundling the connecting components of a tapered roller bearing of Figure 24 the present invention.

[0067] Figure 32 represents a cross-sectional view showing the third embodiment of the tapered roller bearing of the present invention.

[0068] Figure 33 represents a perspective view showing the fourth embodiment of the tapered roller bearing of the present invention.

[0069] Figure 34 represents the front view of the inner ring assembly of the tapered roller bearing of the fifth embodiment of the present invention, observed axially.

[0070] Figure 35 represents a perspective view of this inner ring assembly.

[0071] Figure 36 represents a cross-sectional view of a cage segment of the tapered roller bearing cage.

[0072] Figure 37 represents the top view of this cage segment, observed from the radially outer side.

[0073] Figure 38 represents a perspective view of this cage segment. Detailed Description of the Invention

[0074] ​​​​​​​​​​​Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the direction of the bearing central axis AX is referred to as the "axial direction", the direction perpendicular to the bearing central axis AX is referred to as the "radial direction", and the circumferential direction around the bearing central axis AX is referred to as the "circumferential direction". In addition, the side facing the bearing central axis AX is referred to as the "inner diameter side", and the side away from the bearing central axis AX is referred to as the "outer diameter side". Further, in the axial direction, the direction in which the diameter of the raceway surface 14 of the outer ring 12 becomes smaller is referred to as the "small diameter side", and the direction in which the diameter of the raceway surface 14 becomes larger is referred to as the "large diameter side".

[0075] <First Embodiment>

[0076] As Figure 1 shown, the tapered roller bearing 1 of the present embodiment includes 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 retainer 17 that holds the tapered rollers 15 at a constant interval. The retainer 17 has a pocket 16 that opens in the radial direction, and the tapered rollers 15 are held in the pocket 16.

[0077] The outer ring 12 has a raceway surface 14 on the inner circumference thereof for the tapered rollers 15 to roll. The inner ring 11 has a raceway surface 13 on the outer circumference thereof for the tapered rollers 15 to roll, and large flange portions 19 and small flange portions 18 that contact the end faces of the tapered rollers 15 are provided on both sides in the axial direction sandwiching the raceway surface 13.

[0078] The tapered roller bearing 1 of the present embodiment is, for example, a large tapered roller bearing used to support the main shaft of a wind power generator or the like. For such a tapered roller bearing 1, 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. However, the use of the tapered roller bearing 1 is not limited to this.

[0079] Figure 2 is a front view of the inner ring assembly As composed of the inner ring 11, the retainer 17, and the tapered rollers 15 as viewed from the axial direction. As shown in this figure, the retainer 17 is a segmented retainer having a plurality of retainer segments 20 segmented in the circumferential direction. Specifically, the plurality of retainer segments 20 are connected by a connecting member 25 described later to form the retainer 17. The retainer segment 20 of the present embodiment is made of resin. Specifically, the retainer segment 20 is made of, for example, polyetheretherketone added with carbon fiber or polyetheretherketone added with glass fiber. However, the material of the retainer segment 20 is not limited to this.

[0080] Figure 3 is a perspective view of the inner ring assembly As, Figure 4 is a cross-sectional view of the retainer segment 20, Figure 5 is a top view of the retainer segment 20 as viewed from the radially outer side, Figure 6is a perspective view of the retainer segment 20. It should be noted that Figure 3 only one retainer segment 20 is shown. In the following description, the retainer segment 20 will sometimes be simply referred to as "segment 20".

[0081] As Figure 5 shown, the 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 side and small-diameter side arc-shaped portions 22, 21. That is, the small-diameter side arc-shaped portion 21 and the large-diameter side arc-shaped portion 22 are oppositely arranged with a predetermined interval therebetween, and a plurality of column portions 23 are provided between the small-diameter side arc-shaped portion 21 and the large-diameter side arc-shaped portion 22.

[0082] The space formed by two mutually opposite column portions 23, 23, the small-diameter side arc-shaped portion 21 and the large-diameter side arc-shaped portion 22 constitutes a pocket 16 for accommodating the tapered roller 15. In the present embodiment, six column portions 23 are provided on one segment 20, and five pockets 16 are arranged side by side in the circumferential direction. However, the number of pockets 16 is not limited to this, as long as three or more are provided in the circumferential direction on one segment 20.

[0083] As Figure 4 shown, among these five pockets 16, the pockets 16, 16 at both circumferential ends have first guide claws 24a extending from the column portion 23 toward the inner diameter side, while the three pockets 16 at the central position other than the two ends have second guide claws 24b extending from the column portion 23 toward the outer diameter side OS. The first guide claw 24a can prevent the tapered roller 15 from falling off toward the inner diameter side IS, and the second guide claw 24b can prevent the tapered roller 15 from falling off toward the outer diameter side OS.

[0084] The roller guide surfaces 24aa, 24ba on the inner circumferential surfaces of the first and second guide claws 24a, 24b are concave and curved along the shape of the tapered roller 15. Through these guide claws 24a, 24b, the retainer 17 is guided only by the tapered roller 15 during operation. That is, the tapered roller bearing 1 of the present embodiment can achieve roller guidance.

[0085] The tapered roller 15 can be inserted into the three central pockets 16 from the inner diameter side IS of the segment 20. Due to the second guide claw 24b, the tapered roller 15 will not fall off toward the outer diameter side OS. In addition, in Figure 3 the state of the inner ring assembly As shown, since the raceway surface 13 of the inner ring is located on the inner diameter side, the tapered roller 15 will not fall off toward the inner diameter side either.

[0086] As Figure 4 shown, the tapered roller 15 can be inserted into the pockets 16 at the circumferential ends from the outer diameter side OS. In Figure 3In the state of the inner ring component As shown, since the raceway surface 13 of the inner ring is located on the inner diameter side, the tapered roller 15 will not fall off toward the inner diameter side. However, the tapered roller 15 accommodated in the Figure 4 pockets 16 at both ends shown has a possibility of falling off toward the outer diameter side OS. In the present embodiment, as shown in Figure 3 , an anti-drop component 32 is provided along the outer diameter surface 23a of the columnar portions 23 at both ends of the segment 20. By this anti-drop component 32, the tapered roller 15 can be prevented from falling off toward the outer diameter side.

[0087] The anti-drop component 32 is made of, for example, resin or metal. However, the material of the anti-drop component 32 is not limited thereto. As shown in Figure 6 , the anti-drop component 32 has a columnar portion 32a extending along the outer diameter surface of the segment 20, a base portion 32b extending along the large-diameter side side surface of the segment 20, and a segment engaging portion 32c engaging with the inner diameter surface of the segment 20.

[0088] In the present embodiment, the columnar portion 32a extends along the outer diameter surface 22a of the large-diameter side arcuate portion 22, the outer diameter surface 23a of the columnar portion 23, and the outer diameter surface 21a of the small-diameter side arcuate portion 21. However, the columnar portion 32a only needs to extend along the outer diameter surface 22a of the large-diameter side arcuate portion 22 at least. The columnar portion 32a abuts against the outer diameter surface 22a of the large-diameter side arcuate portion 22 and the tapered roller 15 ( Figure 3 ), thereby preventing the tapered roller 15 ( Figure 3 ) from falling off. In the present embodiment, the contact surface 32aa of the columnar portion 32a with the tapered roller 15 ( Figure 3 ) is a concave shape curved along the outer shape of the tapered roller 15 ( Figure 3 ).

[0089] The base portion 32b abuts against the large-diameter side side surface 22b of the large-diameter side arcuate portion 22. The segment engaging portion 32c is a claw-shaped member extending toward the small-diameter side and engages with the inner diameter surface 22c of the large-diameter side arcuate portion 22.

[0090] In this way, the anti-drop component 32 engages with the outer diameter surface 22a, the large-diameter side side surface 22b, and the inner diameter surface 22c of the large-diameter side arcuate portion 22 of the segment 20. Specifically, the columnar portion 32a of the anti-drop component 32 engages with the outer diameter surface 22a of the large-diameter side arcuate portion 22, and the segment engaging portion 32c engages with the inner diameter surface 22c of the large-diameter side arcuate portion 22. Thereby, the movement of the anti-drop component 32 in the radial direction is restricted.

[0091] The anti - detachment member 32 of the present embodiment has a guiding portion 35 for engaging with the connecting member 25. The guiding portion 35 is provided on the base portion 32b of the anti - detachment member 32. Specifically, the guiding portion 35 is provided on the side opposite to the surface of the base portion 32b of the anti - detachment member 32 that abuts against the segment 20.

[0092] In the present embodiment, the guiding portion 35 is an engaging groove for engaging with the connecting member 25 ( Figure 1 ). Specifically, the guiding portion 35 is a groove that opens to the radially outer side. However, the shape of the guiding portion 35 is not limited to this. For example, as Figure 7 The deformation example shows that the guiding portion 35 can also be an insertion through - hole for the connecting member 25 to be inserted through.

[0093] In addition, as Figure 8 The deformation example shows that the width W1 of the entrance of the groove - shaped guiding portion 35 can be set to be smaller than the width W2 of the connecting member 25. The width of the engaging groove (guiding portion) 35 except for the entrance is greater than the width W2 of the connecting member 25 (W1 < W2 < W3). In this case, by elastically deforming the guiding portion 35, the connecting member 25 can be inserted into the engaging groove (guiding portion) 35. Therefore, during assembly, the detachment of the connecting member 25 from the engaging groove (guiding portion) 35 can be suppressed.

[0094] In Figure 9 The deformation example, the anti - detachment member 32 has an inner - ring engaging portion 34 that extends radially inward from the base portion 32b. As Figure 10 Shown, in the state where the anti - detachment member 32 is mounted on the segment 20, the inner - ring engaging portion 34 engages with the large end face 11a of the inner ring 11. Thereby, the expansion of the segment 20 toward the small - diameter side due to the fastening of the connecting member 25 can be prevented.

[0095] As Figure 5 Shown, an anti - detachment member guiding portion 33 is provided at the circumferential end of the large - diameter side arc - shaped portion 32 of the segment 20. The anti - detachment member guiding portion 33 is used to restrict the circumferential movement of the anti - detachment member 32. In the present embodiment, the anti - detachment member guiding portion 33 is a protrusion that protrudes radially outward from the circumferential end on the outer diameter surface 22a of the large - diameter side arc - shaped portion 32, and a protrusion that protrudes radially inward from the circumferential end on the inner diameter surface 22c of the large - diameter side arc - shaped portion 32. However, the shape of the anti - detachment member guiding portion 33 is not limited to this.

[0096] As Figure 5 And Figure 6 Shown, the anti - detachment member 32 can be inserted and removed from the segment 20 along the anti - detachment member guiding portion 33 from the side of the large end face 11a of the inner ring 11 ( Figure 1 ). That is to say, the anti - detachment member 32 can be mounted on the segment 20 and detached from the segment 20.

[0097] On both ends of the large-diameter side surface 22b of the large-diameter side arc-shaped portion 22 of the retainer segment 20, large-diameter side protrusions 26 are provided. The large-diameter side protrusions 26 protrude axially from the large-diameter side surface 22b of the large-diameter side arc-shaped portion 22. The large-diameter side protrusions 26 have engaging portions 27 that engage with the connecting member 25. In the present embodiment, the engaging portion 27 is an engaging groove for the connecting member 25 to be fitted into.

[0098] The large-diameter side protrusions 26 are arranged so as not to interfere with the anti-drop-off member 32 and the anti-drop-off member guiding portion 33. In the present embodiment, in the state of the inner ring assembly As shown in Figure 3 , the anti-drop-off member 32 is installed between the large-diameter side protrusions 26 and the anti-drop-off member guiding portion 33 in the circumferential direction. That is, the large-diameter side protrusions 26 and the anti-drop-off member 32 are arranged side by side in the circumferential direction, and the engaging portion 27 of the large-diameter side protrusion 26 ( Figure 5 ) is connected to the guiding portion 35 of the anti-drop-off member 32 ( Figure 6 ). By engaging and fastening the connecting member 25 ( Figure 1 ) with the engaging portion 27 ( Figure 5 ) and the guiding portion 35 ( Figure 6 ), the respective retainer segments 20 and the respective anti-drop-off members 32 are connected.

[0099] Next, the connecting member 25 in Figure 1 will be described. The connecting member 25 is detachable with respect to the segment 20 and the anti-drop-off member 32 ( Figure 3 ), and prevents the segmented retainer 17 arranged in a ring shape from loosening. The connecting member 25 can be, for example, a wire. However, the connecting member 25 is not limited to a wire, and can also be a belt or the like.

[0100] In the present embodiment, the two end portions of the connecting member 25 are connected by a fastening portion or a fastening member. By arranging the connecting member 25 near the large-diameter side arc-shaped portion 22 as shown in Figure 5 of the retainer 17, after the bearing is assembled, there can be ensured a clearance for detaching the connecting member 25 by hand or with a tool. In addition, the fastening portion or the fastening member is preferably arranged between the large-diameter side protrusions 26, 26 at both ends of the large-diameter side arc-shaped portion 22 of the segment 20.

[0101] The connecting member 25 can be a continuous one, but the connecting member 25 can also be divided into a plurality of parts, and the end portions of the respective connecting members 25 are connected by a fastening portion or a fastening member 42 ( Figure 19 ). In this case, the plurality of fastening portions and the fastening members 42 ( Figure 19 ) are preferably arranged at equal intervals on the circumference. By the fastening portion or the fastening member 42 ( Figure 19 ), a fastening force can be uniformly applied to the entire connecting member 25.

[0102] When a steel wire is used as the connecting member 25, a hook or a turnbuckle ( Figure 19 ) can be used as the fastening member 42. The turnbuckle is detachable, and the fastening force will not become loose. Moreover, the fastening force can be adjusted, so it is preferred. When a steel wire is used as the connecting member 25, a detachable buckle is relatively preferred because the fastening force will not become loose.

[0103] As Figure 19 shown, when a turnbuckle is used as the fastening member 42, the fastening member 42 has a main body with an internal thread portion. By screwing the external thread portion provided at the end of the connecting member 25 into this main body, the ends of the connecting member 25 can be connected to each other. By rotating the main body of the turnbuckle 42, tension can be applied to the connecting member 25, and reverse rotation can release the bundling at both ends of the connecting member 25.

[0104] In the present embodiment, as Figure 5 shown, on the small-diameter side arc-shaped portion 21 of the segment 20, a small-diameter side protrusion 28 is provided. The small-diameter side protrusion 28 protrudes axially from the small-diameter side side surface of the small-diameter side arc-shaped portion 21. In the present embodiment, the small-diameter side protrusions 28 are provided at both ends in the circumferential direction of the small-diameter side arc-shaped portion 21.

[0105] As Figure 11 shown, the annular clamp 31 can be fitted with the small-diameter side protrusion 28. When the large-diameter sides of the respective segments 20 are bundled by the connecting member 25, the annular clamp 31 fitted on the small-diameter side protrusion 28 can suppress the expansion of the segment 20 toward the small-diameter side due to the fastening of the connecting member 25. The annular clamp 31 can be freely detached and attached.

[0106] In Figure 12 a modification, instead of the small-diameter side protrusion 28 ( Figure 11 ), a small-diameter side engaging portion 36 is provided on the small-diameter side side surface of the small-diameter side arc-shaped portion 21 of the retainer segment 20. In Figure 12 an example, the small-diameter side engaging portion 36 is an engaging groove for engaging the small-diameter side connecting member 37. However, as long as the small-diameter side engaging portion 36 can engage with the small-diameter side connecting member 37, it is not limited to the form of an engaging groove.

[0107] The small-diameter side connecting member 37 can be, for example, a steel wire and is detachable with respect to the segment 20. The retainer segment 20 can also be connected by the small-diameter side connecting member 37. When the large-diameter sides of the respective segments 20 are bundled by the connecting member 25, by fastening the small-diameter side connecting member 37 fitted in the small-diameter side engaging portion 36, the outward expansion of the small-diameter side of the segment 20 can be suppressed.

[0108] Next, the assembly steps of the tapered roller bearing according to this embodiment will be described. First, as Figure 3 shown, an inner ring assembly As in which the inner ring 11, the tapered rollers 15, and the cage 17 are integrated is assembled. When assembling the inner ring assembly As, first, with the large end face 11a ( Figure 13 ) of the inner ring 11 facing downward, the tapered rollers 15 to be placed in the pockets 16 ( Figure 1 ) other than both ends of the segment 20 are arranged on the raceway surface of the inner ring 11.

[0109] When the tapered rollers 15 are arranged on the raceway surface 13 of the inner ring 11 with the large end face 11a ( Figure 13 ) of the inner ring 11 facing downward, the tapered rollers 15 may fall off due to their own gravity. To prevent this from happening, as Figure 13 shown, the distance from the central axis AX1 of the inner ring 11 to the front end of the large flange portion 19 is set to be 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.

[0110] Specifically, in a state where the large end face 11a of the inner ring 11 is facing downward and the tapered rollers 15 are placed on the raceway surface 13 of the inner ring 11, when the angle formed by the large flange portion 19 of the inner ring 11 and a straight line perpendicular to the central axis AX1 of the inner ring 11 is set to I, the chamfer width at the front end of the large flange portion 19 is set to H, the distance from the central axis AX1 of the inner ring 11 to the center of gravity C1 of the tapered roller 15 is set to y1, and the diameter of the large flange portion 19 is set to J, the following formula (1) is satisfied:

[0111] (J / 2)-H·cosI>y1···(1)

[0112] Next, as Figure 14 shown, the tapered rollers 15 are inserted into the pockets 16 at both ends of the segment 20. In this state, as Figure 15 and Figure 16 shown, the segment 20 is covered on the inner ring 11 on which the tapered rollers 15 are arranged. Thus, the tapered rollers 15 are inserted into the pockets 16 other than both ends from the inner diameter side.

[0113] Next, as Figure 17 shown, in order to prevent the tapered rollers 15 housed at both ends of the segment 20 from falling off toward the large diameter side, the anti-falling-off member 32 is inserted from the large end face side of the inner ring 11 along the anti-falling-off member guide portions 33 at both ends of the large diameter side arc portion 22.

[0114] Next, the L-shaped annular clamp 31 ( Figure 19 ) is inserted into the small diameter side protruding portion 28 protruding toward the small diameter side of the segment 20 arranged in a ring shape as shown in Figure 18 . Figure 18 Indicates the annular clamp 31 (Figure 19 ) The state before embedding, Figure 19 indicates the state after the annular clamp 31 is embedded.

[0115] In addition, as Figure 19 shown, the connecting member 25 is engaged with the engaging portion 27 of the large-diameter side protrusion 26 on the large-diameter side side surface 22b of the segment 20 ( Figure 5 ) and the guiding portion 35 of the anti-drop-off member 32. The end portion of the connecting member 25 disposed on the outer diameter side of the segment 20 is bundled with the fastening member 42, and then the connecting member 25 is tightened by the fastening member 42. Thus, a plurality of segments 20 arranged in a ring shape are integrated. So far, the assembly of the inner ring assembly As is completed. After the inner ring assembly As is assembled, the annular clamp 31 can be disassembled by moving along the central axis.

[0116] After the inner ring assembly As is assembled, as Figure 22 and Figure 23 shown, the inner ring assembly As is installed in the outer ring 12. The operation of installing the inner ring assembly As into the outer ring 12 can be performed in a flipped state with the small-diameter side of the inner ring assembly As facing downward. Even in the flipped state, since the outer peripheral sides of the segments 20 arranged in a ring shape are connected by the connecting member 25, the segments 20 will not become loose.

[0117] In addition, the tapered roller 15 inserted into the pocket 16 other than both ends of each segment 20 is prevented from falling off by the second guiding claw 24b ([[]]ID=21]] Figure 3 ) provided on the outer diameter side, and the tapered roller 15 inserted into the pockets 16 at both ends ( Figure 14 ) is prevented from falling off by the anti-drop-off member 32 ( Figure 17 ). The operation of installing into the outer ring 12 is performed after removing the annular clamp 31 ( Figure 19 ).

[0118] Even when the inner ring assembly As is in a flipped state with the annular clamp 31 removed ( Figure 19 ), the tapered roller 15 is clamped between the large flange portion 19 and the small flange portion 18, and the tapered roller 15 is engaged with the small flange portion 18, thereby preventing each segment 20 from falling off.

[0119] When the tapered roller 15 does not contact the large flange portion 19, as Figure 20 shown, the tapered roller 15 rotates in the direction of arrow AR1 with the point A on the raceway surface 13 as the center. When the tapered roller 15 contacts the large flange portion 19, as Figure 21 shown, the tapered roller 15 rotates in the direction of arrow AR2 with the point B on the inner surface of the large flange portion 19 as the center.

[0120] As Figure 21 ​​​​​When the tapered roller 15 shown rotates about point B, the end face on the small-diameter side of the tapered roller 15 comes into contact with point C on the side surface of the small flange portion 18. Accordingly, the rotation of the tapered roller 15 is suppressed. Here, point C is the contact point where the side surface of the small flange portion 18 comes into contact with the end face on the small-diameter side of the tapered roller 15 when the tapered roller 15 rotates about the tip of the large flange portion 18 of the inner ring 11. In other words, the contact point C is the intersection of the spline curve SC that depicts the locus of the small end face corner portion of the tapered roller 15 when the tapered roller 15 rotates and the side surface of the small flange portion 18.

[0121] Specifically, in a state where the retainer segments 20 are connected by the connecting member 25 shown Figure 22 when the diameter of the small flange portion 18 of the inner ring 11 shown Figure 21 is set as M, the angle formed by the small flange portion 18 and a straight line perpendicular to the central axis AX1 of the inner ring 11 is set as L, the chamfer width at the tip of the small flange portion 18 is set as K, and the distance from the contact point C to the central axis AX1 is set as y3, the following formula (2) is satisfied.

[0122] (M / 2) - K·cosL > y3 ··· (2)

[0123] After Figure 23 the tapered roller bearing 1 shown is assembled, by loosening the fastening member 42 ( Figure 19 ), the connecting member 25 and the anti-drop-off member 32 ( Figure 19 ) can be disassembled. After the tapered roller bearing 1 is assembled, even if the connecting member 25 and the anti-drop-off member 32 ( Figure 19 ) are disassembled, the respective segments 20 do not become loose.

[0124] Thus, according to the present embodiment, since Figure 19 the connecting member 25 and the anti-drop-off member 32 shown are detachable, while the inner ring assembly As is integrated by the connecting member 25 and the anti-drop-off member 32, after the bearing is assembled, the connecting member 25 and the anti-drop-off member 32 can also be disassembled. In addition, Figure 4 the retainer 17 shown is guided only by the tapered roller 15 during operation by the first and second guide claws 24a, 24b, and thus roller guidance can be achieved.

[0125] <Second Embodiment>

[0126] Next, a second embodiment of the present invention will be described. In the following description, the same reference numerals are given to the same structures as those in the first embodiment, and detailed descriptions may sometimes be omitted.

[0127] As shown in Figure 24As shown, the tapered roller bearing 1 of the second embodiment includes an inner ring 11, an outer ring 12 concentrically disposed on its outer periphery, a plurality of tapered rollers 15 disposed between the inner ring 11 and the outer ring 12, and a cage 17 having pockets 16 that hold the tapered rollers 15 at a certain interval.

[0128] The outer ring 12 has a raceway surface 14 on its inner periphery for each tapered roller 15 to roll.

[0129] The inner ring 11 has a raceway surface 13 on its outer periphery for each tapered roller 15 to roll, and on both axial sides sandwiching this raceway surface 13, there are provided a large flange portion 19 and a small flange portion 18 that the end faces of the tapered rollers 15 will contact.

[0130] In the case of a large tapered roller bearing 1 for supporting a main shaft of a wind power generation or the like, 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.

[0131] As Figure 25 shown, the cage 17 is a segmented cage composed of a plurality of segments 20.

[0132] As Figure 25 、 Figure 26 and Figure 27 shown, the segment 20 has a pair of small-diameter side arcuate portions 21 and large-diameter side arcuate portions 22 that are disposed opposite each other with a predetermined interval therebetween, and a plurality of column portions 23 bridging between the small-diameter side arcuate portion 21 and the large-diameter side arcuate portion 22. The space surrounded by two adjacent column portions 23, the small-diameter side arcuate portion 21, and the large-diameter side arcuate portion 22 is used as the pocket 16 for accommodating the tapered roller 15.

[0133] On one segment 20, there are provided 3 or more pockets 16 for accommodating the tapered rollers 15 in the circumferential direction. In the present embodiment, 6 column portions 23 are provided on one segment 20, and 5 pockets 16 for accommodating the tapered rollers 15 are provided between adjacent column portions 23.

[0134] Among these 5 pockets 16, for the pockets 16 other than those at the circumferential ends, in the present embodiment, that is, on the outer diameter side of the column portions 23 opposite to the 3 pockets 16 located at the central portion, there are provided guide claws 24 for preventing the tapered rollers 15 from falling off to the outer diameter side. And, as Figure 27 shown, the tapered rollers 15 can be inserted into the pockets 16 from the inner diameter side of the segment 20.

[0135] For the pockets 16 at the circumferential ends, guide claws 24 are provided on the inner diameter side of the opposite column portions 23 so that the tapered rollers 15 can be inserted into the pockets from the outer diameter side. And, as Figure 26 and Figure 27As shown, the anti-drop-off member 32 provided along the outer diameter surface of the column portions 23 at both ends of the segment 20 prevents the tapered rollers 15 accommodated in the end pockets 16 from dropping off toward the outer diameter side. The anti-drop-off member 32 can be inserted and removed from the side of the large end face of the inner ring 11 with respect to the anti-drop-off member fixing portions 33 provided on the outer diameter surfaces at the circumferential both ends of the small-diameter side arcuate portion 21 and the large-diameter side arcuate portion 22.

[0136] In the pocket 16 that accommodates the tapered roller 15, since the pocket 16 located at the circumferential end portion is provided with the guide claws 24 on the inner diameter side of the column portion 23, the cage 17 is guided by the rolling elements according to the tapered rollers 15 accommodated in the pockets 16 at the end portions.

[0137] As Figure 24 and Figure 26 shown, on the end portion on the large end face side of the inner ring 11 of the anti-drop-off member 32, there is an inner ring engagement portion 34, and the inner ring engagement portion 34 engages with the large end face of the inner ring 11 in a state where the anti-drop-off member 32 is inserted from the large end face side of the inner ring 11 into the anti-drop-off member fixing portions 33 provided on the outer diameter surfaces at both ends of the small-diameter side arcuate portion 21 and the large-diameter side arcuate portion 22.

[0138] The surface of the anti-drop-off member 32 that contacts the tapered roller 15 is machined into a chamfered surface (Japanese: R surface).

[0139] The anti-drop-off member fixing portions 33 provided on the outer diameter surfaces at both ends of the above-mentioned small-diameter side arcuate portion 21 and the large-diameter side arcuate portion 22, in addition to the form provided with holes for inserting the anti-drop-off member 32 as Figure 26 and Figure 27 shown, can also be machined into a groove shape that opens toward the adjacent segments 20 as Figure 28 shown. When the anti-drop-off member fixing portions 33 are machined into the groove shape that opens toward each other as Figure 28 shown, a common anti-drop-off member 32 ( Figure 26 ) is inserted into the groove-shaped anti-drop-off member fixing portions 33 opposite to each other of the adjacent segments 20, and through this common anti-drop-off member 32 ( Figure 26 ), the tapered rollers 15 ( Figure 24 ) accommodated in the pockets 16 at both ends of the adjacent segments 20 can be prevented from dropping off toward the outer diameter side, so the number of components can be reduced.

[0140] As Figure 26 shown, the segments 20 are arranged in a ring shape in a state where the end faces of the small-diameter side arcuate portion 21 and the large-diameter side arcuate portion 22 are in contact with each other.

[0141] At both ends of the large-diameter side surface of the large-diameter side arc-shaped portion 22 of the segment 20, there are provided protruding portions 26 that protrude axially. The protruding portions 26 have engaging portions 27 for engaging with connecting members 25 ([ Figure 24 ]) arranged in a ring shape on the large-diameter side of each segment 20. The protruding portions 26 located at both ends of the large-diameter side surface of the large-diameter side arc-shaped portion 22 of the segment 20 are preferably arranged in a form that can prevent the protruding portions 26 between adjacent segments 20 from contacting each other. Figure 24 ).

[0142] The structural portion 34 that engages with the large end surface of the inner ring of the anti-detachment member 32 also has a groove-shaped guiding portion 35 on the large-diameter side surface. The groove-shaped guiding portion 35 engages with the connecting member 25 ([ Figure 24 ]) wound around the large-diameter side of each segment 20 arranged in a ring shape. Figure 24 ).

[0143] On the small-diameter side surface of the small-diameter side arc-shaped portion 21 of the segment 20, there is provided a wing portion 28 that protrudes toward the small-diameter side. When the large-diameter sides of each segment 20 arranged in a ring shape are tied up with the connecting member 25 ([ Figure 24 ]), as shown in Figure 31 , the annular fixture 31 is inserted into the small-diameter side protruding portions of each segment 20 arranged in a ring shape to suppress the expansion of the segment 20 on the small-diameter side due to the tightening of the connecting member 25. Figure 24 ), Figure 31 ).

[0144] The annular fixture 31 is composed of an annular portion 31a that abuts against the end surface on the small-diameter side of the inner ring 11, and an engaging portion 31b that protrudes outward from the axial end of the annular portion 31a. In a state where the annular portion 31a abuts against the end surface on the small-diameter side of the inner ring 11, the engaging portion 31b is inserted into the small-diameter side protruding portion 28 of the segment 20.

[0145] The ends of the connecting member 25 wound around the large-diameter side of each segment 20 are tied up by a fastening member 42 ([ Figure 19 ]) such as a turnbuckle. When the fastening member 42 ([ Figure 19 ]) is composed of a turnbuckle, it has a main body with an internal thread portion. By screwing the external thread portion provided at the end of the connecting member 25 into the main body of the turnbuckle, the ends of the connecting member 25 can be connected to each other. By rotating the main body of the turnbuckle, tension can be applied to the connecting member 25, and when the main body is rotated in the direction opposite to the tightening direction, the tying state of both ends of the connecting member 25 can be released. Figure 19 ). Figure 19 ).

[0146] As the connecting member 25, a wire or a belt can be used. When a wire is used as the connecting member 25, as the fastening member 42 ([ Figure 19 ]), Figure 19), a detachable hook or turnbuckle can be used. The turnbuckle is most preferred because it can be detached and installed, the fastening force will not become loose, and the fastening force is adjustable. When using a belt as the connecting member 25, as the fastening member 42( Figure 19 ), if a detachable buckle is used, it is also preferred because the fastening force will not become loose.

[0147] The segment 20 is made of resin or steel. As the resin for forming the segment 20, polyetheretherketone added with carbon fiber or polyetheretherketone added with glass fiber can be used.

[0148] Due to the assembly steps of the tapered roller bearing 1 using the segment 20 of the second embodiment, which are the same as those of the first embodiment described with reference to Figures 13 - 23 , the description thereof is omitted.

[0149] The tapered roller bearing 1 of the second embodiment can also achieve the same effects as the first embodiment.

[0150] <Third Embodiment>

[0151] In the second embodiment, a small-diameter protruding portion 28 protruding toward the small-diameter side is provided on the small-diameter side surface of the small-diameter side arc-shaped portion 21. When the large-diameter sides of the segments 20 arranged in a ring shape are bundled with the connecting member 25, the L-shaped ring-shaped fixture 31 is fitted on the small-diameter protruding portions 28 of the segments 20 arranged in a ring shape. In the Figure 32 shown third embodiment, instead of the ring-shaped fixture 31, a small-diameter engaging portion 36 is provided on the small-diameter side surface of the small-diameter side arc-shaped portion 21, and a small-diameter connecting member 37 wound around the small-diameter side of the segments arranged in a ring shape is engaged with the small-diameter engaging portion 36. The end of the small-diameter connecting member 37 is detachably bundled by a fastening portion or a fastening member (not shown in the figure), thereby suppressing the expansion of the segment 20 on the small-diameter side due to the fastening of the connecting member 25.

[0152] <Fourth Embodiment>

[0153] In the second and third embodiments, a groove-shaped guide portion 35 for engaging the connecting member 25 is provided in the inner ring engaging portion 34 of the anti-detachment member 32 that engages with the large end surface 11a of the inner ring 11, but it can also be as Figure 33 shown in the fourth embodiment, where the shape of the guide portion 35 is a hole shape for the connecting member 25 to pass through.

[0154] <Fifth Embodiment: Figures 34 - 38 >

[0155] As Figures 34 - 36As shown, in each segment 20, within each pocket 16, the guide claws can also extend in a direction opposite to that of the guide claws of the adjacent pocket 16. Specifically, as Figure 36 shown, the pockets 16, 16 at both circumferential ends and the pocket 16 located in the circumferential middle all have second guide claws 24b extending from the column portion 23 toward the outer diameter side OS. The other two pockets 16, 16 except for those at both circumferential ends and in the circumferential middle have first guide claws 24a extending from the column portion 23 toward the inner diameter side IS.

[0156] In the pockets 16, 16 having the first guide claws 24a extending from the column portion 23 toward the inner diameter side IS, the tapered rollers 15 are inserted from the outer diameter side OS of the segment 20. In each pocket 16 having the second guide claws 24b extending from the column portion 23 toward the outer diameter side OS, the tapered rollers 15 are inserted from the inner diameter side IS of the segment 20. In each pocket 16 having the second guide claws 24b, due to the second guide claws 24b, the tapered rollers 15 will not fall off toward the outer diameter side OS.

[0157] As Figure 35 and Figure 37 shown, the anti-drop-off member 32 can prevent the tapered rollers 15 accommodated in the two pockets 16, 16 having the first guide claws 24a from falling off toward the outer diameter side. As Figure 37 and Figure 38 shown, the anti-drop-off member 32 can be inserted and removed from the side of the large end face of the inner ring along the outer diameter surface of the second guide claws on the central side of the pockets 16, 16 at both ends.

[0158] In addition to having the structure of the first embodiment, the anti-drop-off member 32 also has a second segment engaging portion 32d that engages with the end face of the large-diameter side protrusion 26 of the segment 20. As Figure 35 and Figure 38 shown, the circumferential movement of the anti-drop-off member 32 is restricted by the tapered rollers 15, the second guide claws on the central side of the pockets 16, 16 at both ends, and the large-diameter side protrusion 26 that engages with the second segment engaging portion 32d. Thus, the anti-drop-off member guide portion can be omitted, and compared with other embodiments, the weight of the cage segment 20 can be reduced, and the lubricity of the tapered roller bearing can also be improved.

[0159] As described above, the preferred embodiments have been described with reference to the drawings, but various additions, changes, and deletions can be made without departing from the gist of the present invention. Therefore, such cases are also included in the scope of the present invention.

[0160] [Reference Signs]

[0161] 1... Tapered roller bearing

[0162] 11... Inner ring

[0163] 12… Outer ring

[0164] 15… Tapered roller

[0165] 16… Pocket

[0166] 17… Retainer

[0167] 20… Retainer segment (segment)

[0168] 21… Small-diameter side arc-shaped part

[0169] 22… Large-diameter side arc-shaped part

[0170] 23… Column part

[0171] 24a… First guide claw

[0172] 24b… Second guide claw

[0173] 25… Connecting part

[0174] 26… Large-diameter side protruding part

[0175] 27… Engaging part

[0176] 28… Small-diameter side protruding part

[0177] 31… Annular clamp

[0178] 32… Anti-drop-off part

[0179] 33… Anti-drop-off part guide part

[0180] 34… Inner ring engaging part

[0181] 35… Guide part (insertion through-hole, engaging groove)

[0182] 36… Small-diameter side engaging part

[0183] 37… Small-diameter side connecting part

Claims

1. A tapered roller bearing, which includes a plurality of tapered rollers disposed between an inner ring and an outer ring, and a cage for holding the tapered rollers. The cage has a plurality of cage segments circumferentially divided, and these cage segments are connected by detachable connecting members. Among them, each of the cage segments has three or more pockets arranged circumferentially for receiving the tapered rollers, each of the cage segments has a large-diameter side arcuate portion and a small-diameter side arcuate portion extending circumferentially, and a plurality of column portions connecting the large-diameter side and small-diameter side arcuate portions. The pockets are formed by the large-diameter side arcuate portion, the small-diameter side arcuate portion, and the column portions, each of the cage segments has a pocket having a first guiding claw extending from the column portion toward the inner diameter side, and a pocket having a second guiding claw extending from the column portion toward the outer diameter side, and further includes a detachable anti-drop-off member for preventing the tapered roller received in the pocket having the first guiding claw from dropping off toward the outer diameter side, the anti-drop-off member engages with the outer diameter surface and the large-diameter side surface of the large-diameter side arcuate portion of the cage segment, the cage segment and each of the anti-drop-off members are connected by the connecting member.

2. The tapered roller bearing according to claim 1, wherein, The anti-drop-off member is disposed along the column portion or the second guiding claw, the anti-drop-off member is inserted through from the large end face side of the inner ring.

3. The tapered roller bearing according to claim 1 or 2, wherein, At the circumferential end of the large-diameter side arcuate portion of the cage segment, there is further provided an anti-drop-off member guiding portion for restricting the circumferential movement of the anti-drop-off member.

4. The tapered roller bearing according to claim 1 or 2, wherein, The anti-drop-off member has a guiding portion that engages with the connecting member.

5. The tapered roller bearing according to claim 4, wherein, The guiding portion is an insertion through-hole for the connecting member to be inserted through or an engaging groove for the connecting member to engage with.

6. The tapered roller bearing according to claim 1 or 2, wherein, The anti-drop-off member has an inner ring engaging portion that engages with the large end face of the inner ring.

7. The tapered roller bearing according to claim 1 or 2, wherein, At both ends of the large-diameter side surface of the large-diameter side arcuate portion of the cage segment, there are further provided large-diameter side protrusions having engaging portions that engage with the connecting member.

8. The tapered roller bearing according to claim 1 or 2, wherein Both ends of the connecting member are connected by a fastening portion or a fastening member.

9. The tapered roller bearing according to claim 1 or 2, wherein The connecting member is divided into a plurality of parts, and the ends of each connecting member are connected by a fastening portion or a fastening member.

10. The tapered roller bearing according to claim 9, wherein, A plurality of the fastening portions or the fastening members are arranged at equal intervals in the circumferential direction.

11. The tapered roller bearing according to claim 1 or 2, wherein, On the small-diameter side surface of the small-diameter side arcuate portion of the cage segment, there is further provided a small-diameter side protrusion that can be fitted with an annular fixture.

12. The tapered roller bearing according to claim 11, wherein, The annular fixture can be freely detached and attached.

13. The tapered roller bearing according to claim 1 or 2, wherein, The cage segment is made of polyetheretherketone added with carbon fiber or polyetheretherketone added with glass fiber.

14. The tapered roller bearing according to claim 1 or 2, wherein, The anti-drop-off member is made of resin or metal.

15. The tapered roller bearing according to claim 1 or 2, wherein, In a state where the large end face of the inner ring is facing downward and the tapered roller is placed on the raceway surface of the inner ring, when the angle formed by the large flange portion of the inner ring and a straight line perpendicular to the central axis of the inner ring is set as I, the chamfer width at the front end of the large flange portion is set as H, the distance from the central axis of the inner ring to the center of gravity of the tapered roller is set as y1, and the diameter of the large flange portion is set as J, the following condition is satisfied: (J / 2)-H·cosI>y1.

16. The tapered roller bearing according to claim 1 or 2, wherein In a state where the retainer segments are connected by the connecting member, when the diameter of the small flange portion of the inner ring is set to M, the angle formed by the small flange portion and a straight line perpendicular to the central axis of the inner ring is set to L, and the chamfer width at the front end of the small flange portion is set to K, when the tapered roller is rotated about the front end of the large flange portion of the inner ring, when the distance from the contact point C where the side surface of the small flange portion contacts the small-diameter side end surface of the tapered roller to the central axis is set to y3, the following condition is satisfied: (M / 2) - K·cosL > y3.

17. The tapered roller bearing according to claim 1 or 2, wherein, On the small-diameter side side surface of the small-diameter side arc-shaped portion of the retainer segment, a small-diameter side engaging portion is further provided, and the small-diameter side engaging portion engages with a detachably attachable small-diameter side connecting member.

18. The tapered roller bearing according to claim 1 or 2, wherein, The retainer is a retainer for a large tapered roller bearing having an outer diameter of 1 m or more.

Images