JP2012219822A - Tapered roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tapered roller bearing which can be easily assembled without enlarging the bottom of a retainer or caulking the retainer, and surely prevents fall of tapered rollers.SOLUTION: The inner periphery of an outer ring 1 has a tapered raceway 2. On the outer periphery of an inner ring 11, a tapered raceway 12 is formed. A plurality of tapered rollers 21 assembled between both the raceways 2 and 12 are held by the retainer 31. A large-diameter end side of the tapered raceway 12 formed in the inner ring 11 is provided with a large flange 13. A small-diameter end side thereof has a cylindrical surface 14. After fitting the tapered rollers 21 held by the retainer 31 to the outer periphery of the inner ring 11, a small flange ring 41 is fitted to the cylindrical surface 14 to prevent fall of the tapered rollers 21 by the small flange ring 41 without enlarging the bottom of the retainer or caulking the retainer.

Description

  The present invention relates to a tapered roller bearing in which a tapered roller is incorporated between an outer ring and an inner ring, and the tapered roller is held by a cage.

  In a tapered roller bearing in which a plurality of tapered rollers are assembled between a tapered raceway surface formed on the inner periphery of the outer ring and a tapered raceway surface formed on the outer periphery of the inner ring, and the plurality of tapered rollers are held by a cage. A large brim is formed on the large-diameter end side of the conical raceway surface of the inner ring, and a small brim is provided on the small-diameter end side so that a thrust load is received by the large brim and the tapered roller is prevented from falling off by the small brim. ing.

  Here, in the conventionally known tapered roller bearing, a small brim is integrally provided with respect to the inner ring. Therefore, the tapered roller bearing is assembled by attaching the tapered roller held by the cage to the outside of the inner ring. At times, the tapered roller interferes with the small brim and cannot be assembled as it is.

  Therefore, conventionally, the so-called bottom expansion is performed to expand the small diameter end side of the cage, and then the tapered roller held by the cage is assembled to the outside of the inner ring, and the tapered roller has a small collar. After assembling the passing tapered roller, a jig is used to perform caulking to reduce the diameter of the expanded portion of the retainer so that the original state is restored.

  However, in the assembly of tapered roller bearings as described above, the cage shape collapses and the dimensional accuracy and strength decrease when the diameter of the cage is reduced by expanding the bottom of the cage or by caulking. Sometimes the tapered rollers are skewed and a large load is applied to the cage, which may break the cage.

  In addition, there is a possibility that the tapered roller may fall off due to insufficient caulking of the cage or forgetting caulking.

  In order to solve such a problem, in Patent Document 1, an axial groove for roller assembly is formed in the small collar formed in the inner ring, and the tapered roller is assembled without expanding the diameter of the cage. Has proposed tapered roller bearings that can be used.

JP 2004-132404 A

  By the way, in the tapered roller bearing described in Patent Document 1, it is necessary to form the axial groove at the same pitch as the pitch of the tapered roller, so that it takes time for processing, and the tapered roller and the axial groove When the phases of these two coincide, the tapered roller may fall out, and there is still a point to be improved in preventing the tapered roller from falling off.

  Therefore, in Patent Document 1, the depth of at least one axial groove is made shallower than other axial grooves, or the pitch of at least one axial groove is made different from the pitch of other axial grooves. Tapered roller bearings are proposed at the same time.

  However, in a tapered roller bearing that reduces the depth of one axial groove to prevent the tapered roller from falling off, when the tapered roller is assembled, the cage is deformed into an elliptical shape so that the tapered roller and the axial groove are Therefore, it takes time to assemble the tapered roller bearing, and there are still points to be improved in order to facilitate the assembly.

  On the other hand, in a tapered roller bearing in which the pitch of at least one axial groove is different from the others, it is necessary to keep at least one of the pockets formed in the cage different from the pitch of the other pockets. It takes time to manufacture the container, and it is necessary to assemble the tapered rollers by matching the pockets with different pitches to the axial grooves with different pitches. The point which should be improved in order to make the assemblability easy is left.

  The subject of this invention is the assembly which can be assembled without performing the bottom expansion and crimping of a holder | retainer similarly to patent document 1, and also it can prevent the falling-off of a tapered roller reliably. It is to provide an easy tapered roller bearing.

  In order to solve the above-described problems, in the present invention, an outer ring having a conical raceway surface on the inner periphery, a conical raceway surface on the outer periphery, a large brim is formed on the large diameter end side, and a small diameter is formed. An inner ring having a cylindrical surface with a smaller diameter than the small-diameter end on the end side, a plurality of tapered rollers incorporated between the raceway surface of the outer ring and the raceway surface of the inner ring, and the plurality of tapered rollers spaced in the circumferential direction And a small collar ring fitted and fixed to the cylindrical surface of the inner ring after the tapered roller held by the retainer is assembled to the outer periphery of the inner ring. .

  In the tapered roller bearing having the above-described configuration, when assembling, a subassembly including an inner ring, a cage and a tapered roller is assembled, and the subassembly is assembled in the outer ring. Here, when the subassembly is assembled, the tapered roller held by the cage is assembled from the end side where the cylindrical surface of the inner ring is formed to the outside of the inner ring, and the cylindrical surface is assembled after the tapered roller is assembled. The small collar ring is fitted and fixed to prevent the tapered roller from falling off.

  As described above, the assembly of the sub-assembly consisting of the inner ring, the cage and the tapered roller is performed by assembling the tapered roller held by the cage outside the inner ring and fitting and fixing the small collar ring to the cylindrical surface. Therefore, it is possible to eliminate the need for expanding the bottom of the cage and crimping, and it is possible to easily assemble the subassembly.

  Moreover, since the small brim ring faces each small end surface of the plurality of tapered rollers by fitting the small collar ring to the cylindrical surface of the inner ring, it is possible to reliably prevent the tapered rollers from falling off.

  Here, the fixing of the small collar ring may be by press-fitting, or alternatively, a ring groove that is radially opposed to each of the cylindrical surface of the inner ring and the inner diameter surface of the small collar ring is formed, and a part of the circumferential direction is formed. The small collar ring may be retained in a fitted state by incorporating an elastic ring that is separated and elastically deformable in the radial direction across the ring groove on the inner ring side and the ring groove on the small collar ring side.

  When attaching a small collar ring using an elastic ring, a corrugated ring, a polygonal ring, a countersunk ring, or a coil spring can be used as the elastic ring.

  Here, the corrugated ring means that peaks and valleys are alternately arranged in the circumferential direction by bending the wire, and the circumscribed circle diameter in the natural state is larger than the outer diameter of the cylindrical surface. A ring whose diameter is smaller than the outer diameter of the cylindrical surface and whose circumscribed circle diameter can be reduced below the outer diameter of the cylindrical surface.

  In addition, the polygonal ring is a wire rod bent into a polygon, the circumscribed circle diameter in the natural state is larger than the outer diameter of the cylindrical surface, the inscribed circle diameter is smaller than the outer diameter of the cylindrical surface, A ring that can be reduced in diameter so that the circumscribed circle diameter is equal to or smaller than the outer diameter of the cylindrical surface.

  In addition, the disc retaining ring has a natural outer diameter that is larger than the outer diameter of the cylindrical surface, and an inner diameter that is smaller than the outer diameter of the cylindrical surface and can be reduced below the outer diameter of the cylindrical surface. This is a plate-shaped retaining ring.

  In addition, a coil spring is formed by bending a wire rod having a rectangular cross section into a coil shape, the outer diameter in the natural state is larger than the outer diameter of the cylindrical surface, and the inner diameter is smaller than the outer diameter of the cylindrical surface. A coiled spring that can be reduced to an outer diameter of.

  Here, if a tapered surface for ring expansion guide is formed at the intersection of the cylindrical surface and the side surface of the inner ring, an elastic ring is locked in the ring groove of the small collar ring, and the small collar is connected to the inner ring cylinder. When fitted to the surface, the diameter of the elastic ring expands by contact with the tapered surface, and when the small collar is fitted to a position where the elastic ring faces the ring groove of the inner ring, the elastic ring is restored by its own restoring elasticity. Since the diameter is reduced and engaged with the ring groove on the inner ring side, the small collar ring can be easily assembled.

  Also, if a tapered surface for ring diameter reduction guidance is formed at the intersection of the leading side surface and the inner diameter surface when the small collar ring is assembled, the elastic ring is locked in the ring groove of the inner ring, and the inner ring When the small collar ring is fitted to the cylindrical surface of the ring, the elastic ring contracts due to contact with the tapered surface provided on the small collar ring, and the ring groove of the small collar ring is small until the ring groove faces the elastic ring. When the collar ring is fitted, the elastic ring expands by its own restoring elasticity and engages with the ring groove on the small collar ring side. Even in this case, the small collar ring can be easily assembled. .

  In the tapered roller bearing according to the present invention, the ring grooves of the inner ring and the small collar ring are used as a lubricating oil reservoir, and the small collar ring penetrates the ring groove from the inner side surface, and the lubricating oil stored in the ring groove is used as a bearing. If an oil passage hole leading to the space is provided, the lubricating oil in the ring groove flows into the bearing from the oil passage hole by centrifugal force due to the rotation of the inner ring, so that the inside of the bearing can be effectively oil lubricated.

  In addition, the ring groove of the inner ring and the small collar ring is used as a lubricating oil reservoir, and is formed at the intersection of the side surface on the small diameter end side of the inner ring raceway surface and the cylindrical surface on the side surface on the leading side when the small collar ring is assembled. A plurality of radial grooves that communicate with the relief are provided at intervals in the circumferential direction, and a plurality of axial grooves that communicate the relief and the ring groove are provided around at least one of the fitting surfaces of the small collar ring and the inner ring cylindrical surface. In this case, since the lubricating oil in the ring groove flows into the relief from the axial groove by the rotation of the inner ring and flows into the radial groove from the relief to the inside of the bearing. Also, the inside of the bearing can be effectively oil-lubricated.

  When the small collar ring is formed of a sintered oil-impregnated resin, the lubricity can be improved by the seepage of the lubricating oil from the small collar ring.

  In the present invention, as described above, the cylindrical surface is formed on the small diameter end side of the conical raceway surface formed on the outer periphery of the inner ring, and the small collar ring is fitted and fixed to the cylindrical surface. A sub-assembly composed of an inner ring, a cage and a tapered roller can be assembled without expanding or crimping the bottom of the vessel. And since it can be set as a tapered roller bearing by assembling the subassembly in the outer ring, the tapered roller bearing can be easily assembled without lowering the accuracy and strength of the cage. Further, the small collar ring can surely prevent the tapered roller from falling off.

A longitudinal sectional view showing an embodiment of a tapered roller bearing according to the present invention Sectional view along the line II-II in FIG. Sectional drawing which shows the other example of an elastic ring (4A) is a front view showing still another example of the elastic ring, and (4B) is a side view of (4A). (5A) is a front view showing still another example of the elastic ring, and (5B) is a side view of (5A). Sectional drawing which expands and shows the installation part of the small collar ring of FIG. Sectional view showing the state before the small collar ring is assembled Sectional view of the state before assembly showing another example of a small collar ring Longitudinal sectional view showing another embodiment of tapered roller bearing according to the present invention A longitudinal sectional view showing still another embodiment of the tapered roller bearing according to the present invention. Sectional view along line XI-XI in FIG. A longitudinal sectional view showing still another embodiment of the tapered roller bearing according to the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a tapered roller bearing A according to the present invention includes an outer ring 1, an inner ring 11, a plurality of tapered rollers 21 incorporated between both the wheels 1, 11, and a cage 31 that holds the tapered rollers 21. Have.

  A conical raceway surface 2 is formed on the inner periphery of the outer ring 1. On the other hand, a conical raceway surface 12 is formed on the outer periphery of the inner ring 11, and a large brim 13 is provided on the large diameter end side of the raceway surface 12.

  A cylindrical surface 14 is formed on the inner ring 11 on the small diameter end side of the raceway surface 12. As shown in FIG. 6, the outer diameter of the cylindrical surface 14 is smaller than the smaller diameter end of the raceway surface 12. For this reason, a side surface 15 is formed radially inward from the small diameter end of the raceway surface 12, and a relief 16 is provided at the intersection of the side surface 15 and the cylindrical surface 14.

  As shown in FIG. 1, the cage 31 is incorporated between the raceway surface 2 of the outer ring 1 and the raceway surface 12 of the inner ring 11. The retainer 31 has a conical shape. A plurality of pockets 32 are formed in the conical retainer 31 at equal intervals in the circumferential direction, and the tapered rollers 21 are accommodated in the respective pockets 32.

  As shown in FIG. 6, a small collar ring 41 is fitted and held on the cylindrical surface 14 formed on the inner ring 11. A method of press-fitting the small collar ring 41 into the cylindrical surface 14 can be employed for retaining the retaining member. Here, the fitting of the small collar ring 41 to the cylindrical surface 14 is a loose fitting, and the cylindrical surface 14 is provided with a ring groove 42 radially opposed to the ring groove 17 on the inner periphery of the small collar ring 41 so as to straddle the ring grooves 17 and 42 opposed in the radial direction. An elastic ring 51 is incorporated.

  Here, the elastic ring 51 is partly cut off in the circumferential direction so as to be elastically deformable in the radial direction. In FIG. 2, a corrugated ring in which peaks 51 a and valleys 51 b are alternately arranged in the circumferential direction is adopted as the elastic ring 51, and the circumscribed circle diameter of the peaks 51 a in the natural state of the elastic ring 51 is D, and the inscribed circle is When the circular diameter is d, the outer diameter of the cylindrical surface 14 shown in FIG. 6 is B, and the groove diameter of the ring groove 17 is b, the relationship of D> B> d ≧ b is established, and the circumscribed circular diameter D is cylindrical. The diameter can be reduced to the outer diameter B or less of the surface 14.

  The elastic ring 51 is not limited to the corrugated ring. 3 to 5 show other examples of the elastic ring 51. In FIG. 3, a polygonal ring obtained by bending a wire rod into a polygon is an elastic ring 51. Also in the elastic ring 51 made of the polygonal ring, the circumscribed circle diameter D and the inscribed circle diameter d in the natural state are in a relationship of D> B> d ≧ b, similarly to the elastic ring 51 shown in FIG. Thus, the circumscribed circle diameter D can be reduced to the outer diameter B or less of the cylindrical surface 14.

  In FIG. 4, the outer diameter D in the natural state is larger than the outer diameter B of the cylindrical surface 14, and the inner diameter d is smaller than the outer diameter B of the cylindrical surface 14, and is equal to or smaller than the outer diameter B of the cylindrical surface 14. An elastic ring 51 is a dish-shaped retaining ring that can be reduced in diameter.

  In FIG. 5, a wire having a rectangular cross section is bent into a coil shape so that the outer diameter D in the natural state is larger than the outer diameter B of the cylindrical surface 14, and the inner diameter d is smaller than the outer diameter B of the cylindrical surface 14. A coil spring that can be reduced in diameter to the outer diameter of the cylindrical surface 14 is used as the elastic ring 51.

  As shown in FIG. 6, the outer diameter of the small collar ring 41 is larger than the smaller diameter end of the raceway surface 12 formed on the inner ring 11, and is formed on the outer peripheral portion of the preceding side when fitted to the cylindrical surface 14. A tapered surface 43 is formed, and the tapered surface 43 faces the small end surface 21a of the tapered roller 21 to prevent the tapered roller 21 from falling off in the axial direction.

  The inner ring 11 is formed with a tapered surface 18 for guiding the ring diameter expansion at the intersection of the cylindrical surface 14 and the side surface.

  The tapered roller bearing A shown in the embodiment has the above-described configuration. When the tapered roller bearing A is assembled, the subassembly X including the inner ring 11, the cage 31 and the tapered roller 21 is assembled, and the subassembly X is used as the outer ring. Assemble within 1.

  Here, when the subassembly X is assembled, the tapered roller 21 held by the retainer 31 is assembled to the outer side of the inner ring 11 from the end side where the cylindrical surface 14 of the inner ring 11 is formed, and the tapered roller 21 is assembled. After that, the small collar ring 41 is attached to the cylindrical surface 14. When attaching the small collar ring 41, as shown in FIG. 7, the outer peripheral portion of the elastic ring 51 is locked in the ring groove 42 of the small collar ring 41, and the assembly of the small collar ring 41 and the elastic ring 51 is cylindrical. Mates to surface 14.

  When the small collar ring 41 is fitted to the cylindrical surface 14, the inner peripheral portion of the elastic ring 51 abuts on the tapered surface 18, and the small collar ring 41 is pushed in from the abutting state, thereby contacting the tapered surface 18. The diameter of the elastic ring 51 is expanded, and the small collar ring 41 is fitted to the cylindrical surface 14.

  When the small collar 41 is fitted to the position where the elastic ring 51 faces the ring groove 17 formed in the cylindrical surface 14, the elastic ring 51 is reduced in diameter by its own restoring elasticity, as shown in FIG. The inner peripheral portion engages with the ring groove 17 of the cylindrical surface 14, and the elastic ring 51 is assembled across the ring groove 42 of the small collar ring 41 and the ring groove 17 of the cylindrical surface 14, and the small collar ring 41 is removed. The subassembly X will be formed.

  As described above, the assembly of the sub-assembly X including the inner ring 11, the cage 31 and the tapered roller 21 is performed by assembling the tapered roller 21 held by the cage 31 outside the inner ring 11 to form the small collar ring 41. Since it fits to the cylindrical surface 14, it is possible to eliminate the need for expanding the bottom of the cage 31 and caulking, and the subassembly X can be easily assembled.

  Since the tapered roller bearing A can be assembled by assembling the subassembly X in the outer ring 1, the tapered roller bearing A can be easily assembled without reducing the accuracy and strength of the cage 31. In addition, since the small collar ring 41 faces the small end surface 21a of the tapered roller 21 in the assembled state, the tapered roller 21 can be reliably prevented from falling off.

  In FIG. 7, the elastic ring 51 is locked in the ring groove 17 of the small collar ring 41 so that the small collar ring 41 is fitted to the cylindrical surface 14. However, as shown in FIG. The elastic ring 51 may be engaged with the ring groove 17 formed on the cylindrical surface 14, and the small collar ring 41 may be fitted to the cylindrical surface 14.

  In this case, a tapered surface 44 is provided at the intersection of the preceding side surface and the inner diameter surface by fitting the small collar ring 41, and the diameter of the elastic ring 51 is reduced by contact with the tapered surface 44. Then, the small brim ring 41 is fitted to a position where the ring groove 42 of the small brim ring 41 faces the elastic ring 51, the elastic ring 51 is expanded by its own restoring elasticity, and the outer peripheral part is a ring of the small brim ring 41. The elastic ring 51 is assembled so as to straddle the ring groove 17 of the inner ring 11 and the ring groove 42 of the small collar ring 41 by engaging with the groove 42.

  9 to 12 show another embodiment of the tapered roller bearing according to the present invention. In the tapered roller bearing shown in FIG. 9, the ring grooves 17 and 42 of the inner ring 11 and the small collar ring 41 are used as a lubricating oil reservoir, and the small collar ring 41 is formed with an oil passage hole 45 penetrating from the inner surface to the ring groove 42. is doing. In the tapered roller bearing shown in this embodiment, the small collar ring 41 is tightly fitted to the cylindrical surface 14, and the lubricating oil in the ring grooves 17, 42 leaks to the outside from the fitting surface. I try to prevent it. Since other configurations are the same as those of the tapered roller bearing shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof is omitted.

  In the tapered roller bearing having the above-described configuration, the lubricating oil in the ring grooves 17 and 42 flows into the bearing through the oil passage hole 45 by centrifugal force due to the rotation of the inner ring 11, so that the outer ring 1 and the inner ring 11 and the tapered roller 21 The rolling contact portion can be effectively oil-lubricated.

  10 and 11, in the tapered roller bearing, the ring grooves 17 and 42 of the inner ring 11 and the small collar ring 41 are used as a lubricating oil reservoir, and the inner ring raceway surface 12 is provided on the front side surface when the small collar ring 41 is assembled. A plurality of radial grooves 46 communicated with the relief 16 formed at the intersection of the side surface 15 on the small diameter end side and the cylindrical surface 14 are provided at equal intervals in the circumferential direction. A plurality of axial groove portions 47 communicating with the relief 16 are formed at equal intervals in the circumferential direction between the radial groove portions 46, and the ring groove 42 and the axial direction are formed on one side surface of the ring groove 42 of the small collar ring 41. A communication groove 48 communicating with the groove portion 47 is provided.

  In the tapered roller bearing having the above-described configuration, the lubricating oil in the ring grooves 17 and 42 flows from the communication groove 48 to the axial groove portion 47 and flows into the relief 16 due to the rotation of the inner ring 11, and from the relief 16 to the radial direction. In this case, the rolling contact portion between the outer ring 1 and the inner ring 11 and the tapered roller 21 can be effectively oil-lubricated.

  10 and 11, the communication groove 48 is formed on one side surface of the ring groove 42 of the small collar ring 41, but the communication groove 48 may be omitted. Further, although the axial groove portion 47 is formed on the inner diameter surface of the small collar ring 41, the axial groove portion 47 that communicates the ring grooves 17, 42 and the relief 16 may be formed on the cylindrical surface 14 of the inner ring 11. .

  The tapered roller bearing shown in FIG. 12 is different from the tapered roller bearing shown in FIG. 10 in that the small collar ring 41 is formed of sintered oil-impregnated resin. As described above, when the small collar ring 41 is formed of a sintered oil-impregnated resin, the lubricity can be improved by the seepage of the lubricating oil from the small collar ring 41. In this case, the radial groove 46, the axial groove 47, and the communication groove 48 may be omitted.

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Race surface 11 Inner ring 12 Race surface 13 Large collar 14 Cylindrical surface 15 Side surface 16 Relief 17 Ring groove 18 Tapered surface 21 Tapered roller 31 Cage 41 Small collar ring 42 Ring groove 44 Tapered surface 45 Oil passage hole 46 Radial groove 46 47 Axial groove 51 Elastic ring 51a Mountain 51b Valley

Claims (11)

  An outer ring having a conical raceway surface on the inner periphery and a conical raceway surface on the outer periphery, a large brim is formed on the large diameter end side, and a cylindrical surface having a smaller diameter than the small diameter end is formed on the small diameter end side. A formed inner ring, a plurality of tapered rollers incorporated between the raceway surface of the outer ring and the raceway surface of the inner ring, a cage for holding the plurality of tapered rollers at intervals in the circumferential direction, and the cage A tapered roller bearing comprising a small collar ring fitted and fixed to a cylindrical surface of the inner ring after the held tapered roller is assembled to the outer periphery of the inner ring.   A ring groove that is radially opposed to each of the cylindrical surface of the inner ring and the inner diameter surface of the small collar ring is formed, and an elastic ring that is elastically deformable in a radial direction by cutting off a part in the circumferential direction is provided as a ring groove on the inner ring side. The tapered roller bearing according to claim 1, wherein the small collar ring is held in a fitted state so as to be integrated over the ring groove on the small collar ring side.   In the elastic ring, crests and troughs are alternately arranged in the circumferential direction, and the circumscribed circle diameter in the natural state is larger than the outer diameter of the cylindrical surface, and the inscribed circle diameter of the trough is larger than the outer diameter of the cylindrical surface. The tapered roller bearing according to claim 2, wherein the tapered roller bearing is formed of a corrugated ring having a small diameter and capable of reducing the diameter of the circumscribed circle to be equal to or smaller than the outer diameter of the cylindrical surface.   In the elastic ring, the circumscribed circle diameter in a natural state is larger than the outer diameter of the cylindrical surface, the inscribed circle diameter is smaller than the outer diameter of the cylindrical surface, and the circumscribed circle diameter is the outer diameter of the cylindrical surface. The tapered roller bearing according to claim 2, comprising a polygonal ring that can be reduced in diameter.   The elastic ring is a dish-shaped stopper whose outer diameter in the natural state is larger than the outer diameter of the cylindrical surface and whose inner diameter is smaller than the outer diameter of the cylindrical surface and can be reduced to the outer diameter of the cylindrical surface or less. The tapered roller bearing according to claim 2, comprising a ring.   The elastic ring is made of a wire having a rectangular cross section, the outer diameter in the natural state is larger than the outer diameter of the cylindrical surface, and the inner diameter is smaller than the outer diameter of the cylindrical surface and is equal to or smaller than the outer diameter of the cylindrical surface. The tapered roller bearing according to claim 2, comprising a coil spring that can be reduced in diameter.   The elastic ring is locked in the ring groove of the small collar ring, and the tapered surface for ring expansion guide is formed at the intersection of the cylindrical surface and the side surface of the inner ring. Tapered roller bearings.   An elastic ring is locked in the ring groove of the inner ring, and a tapered surface for guiding a ring contraction is formed at the intersection of the preceding side surface and the inner diameter surface when the small collar ring is assembled. 6. The tapered roller bearing according to any one of items 6.   The ring groove of the inner ring and the small collar ring is used as a lubricating oil reservoir, and the small collar ring has an oil passage hole that penetrates the ring groove from the inner surface to guide the lubricating oil stored in the ring groove into the bearing space. The tapered roller bearing according to any one of claims 1 to 8, wherein the tapered roller bearing is provided.   The ring groove of the inner ring and the small collar ring is used as a lubricating oil reservoir, and is formed at the intersection of the side surface on the small diameter end side of the inner ring raceway surface and the cylindrical surface on the side surface on the leading side when the small collar ring is assembled. A plurality of radial grooves that communicate with the relief are provided at intervals in the circumferential direction, and a plurality of axial grooves that communicate the relief and the ring groove are provided on at least one of the fitting surfaces of the small collar ring and the inner ring cylindrical surface. The tapered roller bearing according to any one of claims 1 to 8, wherein the tapered roller bearing is formed at intervals in the circumferential direction.   The tapered roller bearing according to any one of claims 1 to 10, wherein the small collar ring is made of a sintered oil-impregnated resin.

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