JP2017166625A - Conical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conical roller bearing capable of stably assembling a roller having small difference in diameters between a small end face and a large end face in a normal direction.SOLUTION: A conical roller is a hollow roller having diameter difference as difference between a diameter of a small end face and a diameter of a large end face, of 2 mm or less, and provided with a through hole extended along a shaft center direction at its shaft center. A cage has a pair of annular members disposed at a small end face side and a large end face side of the conical roller, and a pin member inserted to the through hole of the conical roller to connect the pair of annular members to each other. In a state that the conical roller is disposed in a normal direction to an inner ring, a projecting and recessed fitting structure fitted only in assembling in the normal direction of the cage is disposed between the conical roller and the cage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tapered roller bearing, and more particularly, to a tapered roller bearing using a hollow roller having a through hole formed along a shaft center as a rolling element.

  In facilities and the like on which large loads and impact loads act, hollow rollers in which no column portion is disposed between rollers adjacent in the circumferential direction may be used in order to increase the load capacity (Patent Documents 1 to 3). .

  As shown in FIGS. 15 and 16, such a tapered roller bearing includes an outer ring 2 having a raceway surface 1 on the inner periphery, an inner ring 4 having a raceway surface 3 on the outer periphery, and a raceway surface 1 and an inner ring 4 of the outer ring 2. A plurality of tapered rollers 5 disposed between the raceway surface 3 and a cage 6 that holds the tapered rollers 5. The inner ring 4 has a small brim 7 on the small diameter side of the raceway surface 3 and a large brim 8 on the large diameter side. That is, a thrust load is received by the large brim 8, and the tapered roller 5 is prevented from falling off by the small brim 7. The tapered roller 5 is a hollow roller in which a through hole 9 extending in the axial direction is formed in the axial center.

  The cage 6 is inserted into the pair of annular members 10 and 11 disposed on the small end surface 5 a side and the large end surface 5 b side of the tapered roller 5 and the through hole 9 of the tapered roller 5 and is paired with the pair of annular members 10 and 11. And a pin member 12 for connecting the two to each other.

  The pin member 12 is composed of a shaft member having a male screw portion 13a at the tip, and a screw hole 11a is provided in the annular member 11 on the large end surface 5b side. Then, the pin member 12 is inserted into the through hole 9 of the tapered roller 5 from the small end surface 5 a side through the through hole 10 a of the annular member 10, and the male screw portion 13 a of the pin member 12 is inserted into the screw hole 11 a of the annular member 11. Screw on.

  Further, the pin member 12 is inserted through the through hole 10a of the annular member 10 on the small end surface 5a side. In this case, the head portion 13b of the pin member 12 is integrated with the annular member 10 by welding. In FIGS. 15 and 16, reference numeral 15 denotes a welded portion.

JP 2012-184802 A Special table 2009-11534 JP 2014-20392 A

  By the way, in the tapered roller 5 of the tapered roller bearing shown in FIGS. 15 and 16, the difference (diameter difference) between the diameter dimension (diameter dimension) of the small end face 5a and the diameter dimension (diameter dimension) of the large end face 5b is relatively large. It is getting bigger. For this reason, when the tapered roller 5 is assembled, the tapered roller 5 is not assembled in a posture (direction) opposite to the normal posture (direction), that is, the regular direction of the tapered roller 5 is as shown in FIG. The small end surface 5 a side is the direction in which the small ring surface of the inner ring 4 is arranged.

  However, as shown in FIG. 13, when the difference (diameter difference) between the diameter dimension (diameter dimension) of the small end face 5a and the diameter dimension (diameter dimension) of the large end face 5b is relatively small, the tapered roller 5 is assembled. In FIG. 14, the small end surface 5a and the large end surface 5b are difficult to distinguish, and as shown in FIG. 14, there is a possibility that the small end surface 5a and the large end surface 5b are incorporated in a posture (reverse direction) opposite to the normal posture (direction).

  That is, in this case, the difference in diameter between the small end surface 5a and the large end surface 5b is small, and the small end surface 5a and the large end surface 5b are ground and difficult to distinguish from the appearance. Moreover, since the difference in diameter between the small end surface 5a and the large end surface 5b is small, it can be assembled as shown in FIG. In particular, in the tapered roller bearing using the tapered roller 5 which is a hollow roller, a cage having a pocket is not used, so that the tapered roller 5 is not fitted into the pocket when assembled, and the tapered roller is in the reverse direction. However, it can be assembled without knowing that it is in the opposite direction.

  As described above, when assembled in a posture (direction) opposite to the normal posture (direction), the tapered roller 5 may be peeled off or damaged, or the shaft member or the like cannot be rotated smoothly as a bearing. . Further, in a tapered roller bearing used for facilities or the like where a heavy load or impact load acts, the number of rollers used for one bearing is large, for example, 50 / bearing, and human error is likely to occur.

  By the way, in above-mentioned patent document 1, one rolling element (roller) is inserted in each pin of a cage, and it pushes into an inner ring using the elastic force of each pin.

  Further, in Patent Document 2, a desired surface is provided on the inner peripheral surface of the through hole of one annular member (first ring) through which the pin is inserted and the outer peripheral surface of the through hole arrangement portion of the pin arranged in the through hole. By applying a pressure, a pin type cage excellent in strength is provided.

  Furthermore, in patent document 3, a holder | retainer is a pillar part arrange | positioned between the rollers which adjoin along the circumferential direction. That is, in Patent Document 3, the cage has a plurality of divided segments arranged along the circumferential direction, and a pocket into which the roller is inserted is formed in each divided segment. For this reason, a pillar part is arrange | positioned between the pockets adjacent along the circumferential direction.

  For this reason, in each of the Patent Documents 1 to 3, a cone that prevents a roller having a small diameter difference between the small end surface and the large end surface from being incorporated in a posture (reverse direction) opposite to the normal posture (direction). There is no problem of providing roller bearings.

  Accordingly, the present invention provides a tapered roller bearing capable of stably incorporating a roller having a small diameter difference between a small end surface and a large end surface in a normal direction.

  The tapered roller bearing of the present invention includes an outer ring having a raceway surface on the inner periphery, an inner ring having a raceway surface on the outer periphery, a plurality of tapered rollers disposed between the outer ring raceway ring and the inner ring raceway ring, The tapered roller has a diameter difference of 2 mm or less, which is a difference between the diameter of the small end face and the diameter of the large end face, and has a through hole extending along the axial direction in the axis. A hollow roller formed, and the cage includes a pair of annular members disposed on the small end face side and the large end face side of the tapered roller, and a pair of annular members inserted into the through holes of the tapered roller. A tapered roller bearing having a pin member to be connected, and in a state where the tapered roller is disposed in a normal direction with respect to an inner ring, a concave-convex fitting structure that is fitted only in a normal assembly process of the cage, It is provided between the tapered roller and the cage.

  According to the tapered roller bearing of the present invention, the tapered roller is disposed in a normal direction with respect to the inner ring, that is, the large end surface of the tapered roller faces the large collar of the inner ring, and the small end surface of the tapered roller is the inner ring. If the normal assembly process of the cage is performed in a state facing the small brim, the concave-convex fitting structure is brought into a fitted state. The cage is configured to connect a pair of annular members to each other by inserting a pin member through a through hole of a tapered roller. For this reason, as a regular assembly process, an annular member is arranged on the small end face side of the tapered roller, an annular member is arranged on the large end face side of the tapered roller, or a pin member is inserted into the through hole of the tapered roller. It becomes a process to do.

  Therefore, the tapered rollers are not arranged in the normal direction with respect to the inner ring, that is, the small end surface of the tapered roller faces the large collar of the inner ring, and the large end surface of the tapered roller faces the small collar of the inner ring. In a state where the cage is properly assembled, an annular member that should not be supported corresponds to the small end face side of the tapered roller, and an annular member that should not be supported corresponds to the large end face side of the tapered roller. It will be. For this reason, the concave-convex fitting structure cannot be brought into the fitted state, and it can be grasped that the concave-convex fitting structure is arranged in the direction opposite to the normal direction.

  A roller side fitting part consisting of a concave part or a convex part is provided on either the small end face or the large end face of the tapered roller, and the convex part or concave part fitting on the roller side fitting part is provided on the cage side. It is preferable that a cage-side fitting portion is provided, and the roller-side fitting portion and the cage-side fitting portion constitute the uneven fitting structure. By configuring in this way, if the tapered roller is arranged in the normal direction with respect to the inner ring, the roller side fitting portion and the cage side fitting portion are fitted, and the roller in the direction opposite to the normal direction is obtained. When arranged, the roller side fitting part and the cage side fitting part do not fit.

  In this case, a roller side fitting portion made of a concave portion is provided on one side of the small end surface and the large end surface of the tapered roller, and the roller corresponding surface of the annular member facing the roller side fitting portion is provided with a roller. A cage side fitting portion comprising a convex portion to be fitted to the side fitting portion can be provided.

  In addition, a roller side fitting portion formed of a concave portion is provided on either one of the small end surface and the large end surface of the tapered roller, and the retainer side fitting portion is a washer that is externally fitted to the pin member. Can be configured. That is, if the tapered roller is arranged in a normal direction with respect to the inner ring, the washer fitted on the pin member is fitted into the recess that is the roller side fitting portion, and the cage can be assembled. . On the other hand, when the roller in the direction opposite to the normal direction is arranged, the washer is not fitted into the recess, and the cage cannot be assembled.

  A roller side fitting part consisting of a convex part is provided on one side of either the small end face or the large end face of the tapered roller, and the roller side fitting is performed on the roller corresponding surface of the annular member facing the roller side fitting part. The cage side fitting part which consists of a recessed part fitted to a part may be provided.

  Chamfered portions are provided at both openings of the through hole of the tapered roller, and the chamfered portion on the small end surface side and the chamfered portion on the large end surface side are made different from each other. In addition, the cage-side fitting portion may be constituted by a bush fitted on the pin member. In such a case, if the tapered roller is arranged in a normal direction with respect to the inner ring, a bush that is externally fitted to the pin member is fitted to the large chamfered portion that is the roller side fitting portion, and the cage Assembly becomes possible. On the other hand, when rollers in the direction opposite to the normal direction are arranged, the cage cannot be assembled corresponding to the chamfered portion where the bush is small.

  Chamfered portions are provided at both openings of the through hole of the tapered roller, and the chamfered portion on the small end surface side and the chamfered portion on the large end surface side are made different from each other. And you may comprise a cage | basket side fitting part by the projection part provided in the roller corresponding | compatible surface of the annular member by the side of a large chamfering part. With this configuration, if the tapered roller is arranged in a normal direction with respect to the inner ring, the large chamfered portion that is the roller side fitting portion is provided on the roller corresponding surface of the annular member on the large chamfered portion side. As a result, the retainer can be assembled. On the other hand, when the roller of the direction opposite to a normal direction is arrange | positioned, this protrusion cannot respond to a small chamfering part, and a holder cannot be assembled.

  In the present invention, when the tapered roller is arranged in the direction opposite to the normal direction, the cage side fitting portion cannot be fitted to the roller side fitting portion. For this reason, it can be grasped that the tapered rollers that cannot be fitted are arranged in the direction opposite to the normal direction, and the incorporation of the tapered rollers in the reverse direction can be avoided. In particular, even if the diameter difference between the diameter of the small end face and the diameter of the large end face is as small as 2 mm or less, and the small end face and the large end face are difficult to distinguish from the appearance, the tapered roller is not assembled in the reverse direction. Tapered roller bearings can be assembled with high quality, and the bearing function can be demonstrated stably over a long period of time.

It is principal part sectional drawing of the 1st tapered roller bearing of this invention. 1 shows a method for assembling the first tapered roller bearing shown in FIG. 1, (a) is a cross-sectional view of the main part before the pin member is inserted, and (b) is a state in which the tapered roller is sandwiched between a pair of annular members. It is principal part sectional drawing of this, (c) is sectional drawing of the state which mounted | wore with the pin member. It is principal part sectional drawing of the 1st tapered roller bearing of the state in which the tapered roller of the reverse direction and the normal direction was assembled | attached. It is explanatory drawing of the method of assembling the tapered roller of a reverse direction with a normal direction. It is principal part sectional drawing of the 2nd tapered roller bearing of this invention. It is a principal part perspective view of the annular member in which the retainer side fitting part of the tapered roller bearing shown in the said FIG. 5 was provided. It is a principal part expanded sectional view of the tapered roller bearing shown in the said FIG. It is explanatory drawing at the time of attaching the tapered roller of the reverse direction to a normal direction. It is principal part sectional drawing of the 3rd tapered roller bearing of this invention. It is a principal part expanded sectional view of the tapered roller bearing shown in the said FIG. It is explanatory drawing at the time of attaching the tapered roller of the reverse direction to a normal direction. It is principal part sectional drawing of the 4th tapered roller bearing of this invention. It is principal part sectional drawing of the bearing of the state where the roller has been arrange | positioned in the direction of regular orientation. It is principal part sectional drawing of the bearing of the state by which the roller has been arrange | positioned in the reverse direction with a normal direction. It is principal part sectional drawing of the conventional tapered roller bearing using a hollow roller. It is a principal part front view of the tapered roller bearing of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a tapered roller bearing according to the first embodiment. The tapered roller bearing includes an outer ring 22 having a raceway surface 21 on the inner periphery, an inner ring 24 having a raceway surface 23 on the outer periphery, and a raceway surface 21 of the outer ring 22. And a plurality of tapered rollers 25 disposed between the raceway surface 23 of the inner ring 24 and a cage 26 that holds the tapered rollers 25. Further, the inner ring 24 has a small collar 27 formed on the small diameter side of the raceway surface 23 and a large collar 28 formed on the large diameter side. That is, a thrust load is received by the large brim 28 and the tapered roller 25 is prevented from falling off by the small brim 27.

  The tapered roller 25 has a relatively small difference between the diameter of the small end face 25a and the diameter of the large end face 25b. That is, as shown in FIG. 2A, when the diameter of the small end face 25a is Da and the diameter Db of the large end face 25b is set, (Db−Da) ≦ 2 (mm).

  The tapered roller 25 is a hollow roller in which a through hole 29 extending in the axial direction is formed in the axial center. Chamfered portions 29 a and 29 b are provided in the small end surface side opening and the large end surface side opening of the through hole 29, respectively. In this case, the chamfered portion 29a on the small end surface 25a side is set larger than the chamfered portion 29b on the large end surface 25b side. Specifically, the chamfered portion 29 a on the large side is a tapered hole that expands from the inside of the through hole 29 toward the small end surface 25 a, and the chamfered portion 29 b on the small side is an opening on the large end surface side of the through hole 29. It is comprised from the round part provided in a part.

  The cage 26 is inserted into the pair of annular members 30 and 31 disposed on the small end surface 25 a side and the large end surface 25 b side of the tapered roller 25 and the through hole 29 of the tapered roller 25 and is paired with the pair of annular members 30 and 31. And a pin member 32 for connecting the two to each other. The pin member 32 has a pin member main body 33 whose shaft diameter is slightly smaller than the inner diameter of the through-hole 29, a male screw portion 34 connected to the tip of the pin member main body 33, and a base of the pin member main body 33. The head 35 is provided at the end.

  The annular member 30 is provided with a plurality of through holes 36 at an equal pitch along the circumferential direction. In this case, as shown in FIG. 1, the annular member 30 is arranged so as to face the small end surface 25a, so that the inner end surface 30a and the outer end surface 30b are predetermined with respect to a plane orthogonal to the bearing axis. The inner surface 30c and the outer surface 30d are inclined at an angle, and are cylindrical surfaces centered on the shaft center of the bearing. When the tapered roller bearing is assembled, the through hole 36 is disposed on the axis of the through hole 29 of the tapered roller.

  The inner diameter of the through hole 36 is set larger than the shaft diameter of the pin member main body 33 of the pin member 32. In addition, a short cylindrical bush 40 is mounted in the through hole 36, and a counterbore portion 36a is provided in the opening of the through hole 36 on the outer end surface 30b side. In this case, a part of the bush 40 protrudes toward the tapered roller 25 side from the inner end surface 30 a of the annular member 30. For this reason, as shown in FIG. 1, in a state where the tapered rollers 25 are arranged and assembled in the normal direction, the protruding portion 40 a of the bush 40 toward the tapered rollers 25 side is loosened by the large chamfered portion 29 a of the tapered rollers 25. It will be inserted into a fitting shape. Here, the state in which the tapered roller 25 is arranged in the normal direction means that the large end surface 25 b of the tapered roller 25 faces the large collar 28 of the inner ring 24 and the small end surface 25 a of the tapered roller 25 is in contact with the inner ring 24. It is in a state facing the small brim 27. In this way, the large chamfered portion 29a of the tapered roller 25 becomes the roller side fitting portion 50 made of a concave portion, and the protruding portion 40a of the bush 40 fits on the roller side fitting portion made of this concave portion. It becomes the joint part 51. And the roller side fitting part 50 and the cage | basket side fitting part 51 comprise the uneven | corrugated fitting structure M, and this uneven | corrugated fitting structure M is the state by which the tapered roller was arrange | positioned with respect to the inner ring 24 in the normal direction. In this case, the retainer 25 is engaged only in assembly in the normal direction.

  In addition, the annular member 31 is provided with a plurality of screw holes 37 at an equal pitch along the circumferential direction (same pitch as the pitch of the through holes 36 of the annular member 30). In this case, as shown in FIG. 1, the annular member 31 is disposed so as to face the large end surface 25b, so that the inner end surface 31a and the outer end surface 31b are perpendicular to the bearing axis. The inner surface 31c and the outer surface 31d are inclined at a predetermined angle, and are cylindrical surfaces centered on the axis of the bearing. As shown in FIG. 1, when the tapered roller bearing is assembled, the screw hole 37 is disposed on the axis of the through hole 29 of the tapered roller 25.

  Next, a method for assembling the tapered roller bearing configured as shown in FIG. 1 will be described. First, as shown in FIG. 2A, the large-diameter side end surface 24 a of the inner ring 24 is directed downward, and the annular member 31 (the annular member 31 having the screw hole 37) is replaced with the raceway surface 21 of the inner ring 24. The tapered roller 25 fitted in the shape is disposed so as to face the large end surface 25b. At this time, the annular member 31 is received by a receiving member (jig) (not shown).

  Next, as shown in FIG. 2B, one annular member 30 is disposed on the small end surface 25 a of the tapered roller 25. In this state, the male screw portion 34 at the tip of the pin member 32 is inserted into the through hole 29 of the tapered roller 25 through the through hole 36 of the annular member 30. That is, the pin member 32 is inserted into the through hole 29 along the axis of the tapered roller 25.

  For this reason, by causing the male screw portion 34 of the pin member 32 to protrude from the through hole 29 of the tapered roller 25, the male screw portion 34 of the pin member 32 is screwed into the screw hole 37 of the annular member 31. As shown in FIG. 2 (c), it can be screwed. The head 35 of the pin member 32 is used for this screwing. As shown in FIG. 2C, in the state where the male threaded portion 34 of the pin member 32 is screwed into the screw hole 37 of the annular member 31, the base portion of the pin member 32 (the head 35 side of the pin member main body 33). ) Is in a state of being loosely fitted into the through hole 36 of the annular member 30. Therefore, the head member 35 and its vicinity are welded to fix the pin member 32 to the annular member 30.

  By the way, in this tapered roller bearing, the bush 40 that is externally fitted to the pin member 32 is fitted into the through hole 36 of the annular member 30. At this time, the annular member 30 in which the bush 40 is fitted into the through hole 36 of the annular member 30 is arranged as shown in FIG. 2B, and then the pin member 32 is inserted into the through hole 28 of the tapered roller 25. Even if it does so, after arrange | positioning the annular member 30 as shown in FIG.2 (b), the bush 40 is inserted in the through-hole 36 of the annular member 30, and the pin member 32 is made into the through-hole 28 of the tapered roller 25. FIG. Even if it is inserted, after the annular member 30 is arranged as shown in FIG. 2B, the pin member 32 is inserted into the through hole 28 of the tapered roller 25, and then the through hole 36 of the annular member 30. The bush 40 may be inserted into the base.

  In a state where the cage 26 is assembled, a part of the bush 40 protrudes toward the tapered roller 25, and the protruding portion 40a is fitted into the chamfered portion 29a in a loose fit. If this process is performed for all the tapered rollers 25 provided, a unit body in which the tapered rollers 25 held by the cage 26 are mounted on the inner ring 24 is configured. By assembling the unit body and the outer ring 22, the tapered roller bearing shown in FIG. 1 can be assembled.

  By the way, as shown in FIG.1 and FIG.2 (a), when the tapered roller 25 is arrange | positioned in a regular direction, as above-mentioned, the protrusion part 40a to the tapered roller 25 side of the bush 40 is the tapered roller 25. As shown in FIG. Is inserted into the large chamfered portion 29a in a loose fit. However, as shown in FIG. 3, when the tapered roller 25 is assembled in the direction opposite to the normal direction, the protruding portion 40a of the bush 40 bites into the small chamfered portion 29b of the large end surface 25b, and the track of the outer ring 22 The rolling surface (outer diameter surface) of the tapered roller 25 is pressed against the small diameter side of the surface 21 and the small diameter side of the raceway surface 23 of the inner ring 24. The state in which the tapered roller 25 is disposed in the direction opposite to the normal direction is that the small end surface 25 a of the tapered roller 25 faces the large collar 28 of the inner ring 24, and the large end surface 25 b of the tapered roller 25 is small in the inner ring 24. It is in a state of facing the collar 27.

  That is, if a regular assembly process is performed in a state where the tapered roller 25 is disposed in the direction opposite to the normal direction, the protruding portion 40a of the bush 40 is located on the large end surface 25b side of the tapered roller 25 as shown in FIG. As shown in FIG. 2B, the annular member 30 cannot be arranged in contact with the chamfered portion 29b. Here, the regular assembly process is a process shown in FIG. 2, in which the annular member 30 is arranged on the small end face side of the tapered roller 25, or the annular member 31 is arranged on the large end face side of the tapered roller 25. In this process, the pin member 32 is inserted into the through hole 29 of the tapered roller 25.

  For this reason, as shown in FIG. 1, in the thing provided with the uneven | corrugated fitting structure M which consists of the roller side fitting part 50 and the cage | basket side fitting part 51, the tapered roller 25 is arrange | positioned in the reverse direction to a normal direction. In this case, the cage-side fitting portion 51 cannot be fitted to the roller-side fitting portion 50 if the cage is properly assembled. For this reason, it can be grasped that the tapered rollers 25 that cannot be fitted are arranged in the direction opposite to the normal direction, and the incorporation of the tapered rollers 25 in the reverse direction can be avoided. In particular, even if the diameter difference (Db−Da) between the diameter of the small end face 25a and the diameter of the large end face 25b is as small as 2 mm or less, and the small end face 25a and the large end face 25b are difficult to distinguish from each other, The tapered roller bearing can be assembled with high quality without being assembled in the opposite direction, and the bearing function can be exhibited stably over a long period of time.

  Further, in the tapered roller bearing shown in FIG. 1, the roller side fitting portion 50 can be formed by the chamfered portion 29 a of the tapered roller 25, and the cage side fitting portion 51 is fitted into the through hole 36 of the annular member 30. The concave / convex fitting structure M can be provided with a simple configuration with a small number of parts.

  Next, in the tapered roller bearing shown in FIG. 5 (the tapered roller bearing according to the second embodiment), the tapered roller 25 is similar to the tapered roller 25 shown in FIG. Chamfered portions 29a and 29b are respectively provided in the end surface side openings.

  And the convex part 41 of flat conical trapezoid shape as shown in FIG. 6 is provided in the inner end surface 30a of the annular member 30. As shown in FIG. That is, as shown in FIG. 5, when the tapered roller 25 is arranged in the normal direction, as shown in FIG. 7, the convex portion 41 is fitted into the chamfered portion 29a in a loose fit. That is, the chamfered portion 29a constitutes the roller-side fitting portion 50, and the convex portion 41 constitutes the cage-side fitting portion 51 that fits into the roller-side fitting portion 50 formed of the chamfered portion 29a.

  When the tapered roller 25 is disposed in the normal direction, the convex portion 41 on the annular member 30 side is fitted into the large chamfered portion 29 a of the tapered roller 25 in a loose manner as described above. However, if the tapered roller 25 is assembled in the direction opposite to the normal direction and assembled, the convex portion 41 comes into contact with the chamfered portion 29b on the large end surface 25b side of the tapered roller 25 as shown in FIG. The annular member 30 cannot be disposed.

  Even in the tapered roller bearing shown in FIG. 5 and the like, since the concave and convex fitting structure M including the roller-side fitting portion 50 and the cage-side fitting portion 51 is provided, the tapered roller has a direction opposite to the normal direction. When arranged, the roller side fitting portion 50 cannot be fitted to the cage side fitting portion 51. In addition, the cage-side fitting portion 51 is provided by the convex portion 41 provided on the annular member 30, and the convex portion 41 and the cage-side fitting portion 51 can be integrated to improve assemblability. .

  Next, in the tapered roller bearing shown in FIGS. 9 and 10 (the tapered roller bearing of the third embodiment), a ring-shaped convex portion 42 is provided at the center of the small end surface 25a of the tapered roller 25, and the annular member 30 is provided. A circular concave portion 43 into which the convex portion 42 is fitted is provided at the central portion of the inner diameter surface of the first concave portion. In addition, the Nusumi part 44 is provided in the base part of the convex part 42. FIG.

  In this case, when the tapered roller 25 is arranged in the normal direction, the convex portion 42 is fitted (fitted) into the concave portion 43 in a loose fit. However, when the tapered roller 25 is arranged in the direction opposite to the normal direction, the concave portion 43 of the annular member 30 corresponds to the large end surface 25b having no concave portion of the tapered roller 25 as shown in FIG. The cage cannot be assembled. For this reason, the convex part 42 of the small end surface 25 a of the roller 25 constitutes the roller side fitting part 50, and the concave part 43 of the annular member 30 constitutes the cage side fitting part 51.

  The tapered roller bearing shown in FIGS. 9 and 10 also has an uneven fitting structure M composed of a roller-side fitting portion 50 and a cage-side fitting portion 51, and the tapered rollers are arranged in a direction opposite to the normal direction. In this case, the roller-side fitting portion 50 cannot be fitted with the cage-side fitting portion 51, and it is possible to avoid assembling the tapered roller in a reverse orientation. Moreover, in the tapered roller bearing shown in FIGS. 9 and 10, since the convex portion 42 is provided on the small end surface 5a, the posture of the tapered roller 25 can be grasped also by the appearance. Moreover, since the washer 46 of the cage side fitting portion 51 is used, the configuration of the cage side fitting portion 51 can be simplified and the cost can be reduced.

  Next, in the tapered roller bearing shown in FIG. 12 (the tapered roller bearing of the fourth embodiment), a recess 45 is provided in the large end surface 25 b of the tapered roller 25, and a ring that is externally fitted to the pin member 32 in the recess 45. A body (washer) 46 is fitted. In this case, the concave portion 45 of the large end surface 25 b of the tapered roller 25 constitutes the roller side fitting portion 50, and the retainer side fitting portion 51 is constituted by the washer 46. That is, the concave and convex fitting structure M is configured by the concave portion 45 and the washer 46.

  When the tapered roller 25 is arranged in the normal direction, the washer 46 can be fitted into the recess 45 as shown in FIG. However, when the tapered roller 25 is disposed in the direction opposite to the normal direction, the concave portion 45 of the large end surface 25 b of the tapered roller 25 is disposed on the annular member 30 side having the through hole 36. For this reason, the washer 46 disposed on the male screw portion 34 side of the pin member 32 cannot be fitted into the concave portion 45 of the large end surface 25 b of the tapered roller 25.

  Therefore, in the tapered roller bearing shown in FIG. 12, when the concave and convex fitting structure M including the roller side fitting portion 50 and the cage side fitting portion 51 is provided, the tapered roller 25 is provided in the direction opposite to the normal direction. When arranged, the roller side fitting portion 50 cannot be fitted to the cage side fitting portion 51. That is, even if it is what is shown in this FIG. 12, the uneven | corrugated fitting structure M which consists of the roller side fitting part 50 and the holder | retainer side fitting part 51 will be provided. In addition, when using this washer 46, when assembling, in the state shown to Fig.2 (a), it will mount on this annular member 31. FIG.

  Further, in the tapered roller bearing shown in FIG. 12, the concave portion 45 of the large end surface 25 b of the tapered roller 25 constitutes the roller side fitting portion 50 and the washer 46 constitutes the cage side fitting portion 51. For this reason, the posture of the tapered roller 25 can be grasped by the concave portion 45 of the large end surface 25 b of the tapered roller 25.

  Thus, the tapered roller bearing of the second embodiment shown in FIG. 6, the tapered roller bearing of the third embodiment shown in FIG. 9, and the tapered roller bearing of the fourth embodiment shown in FIG. However, the same effect as the tapered roller bearing shown in FIG. That is, as the roller side fitting part 50, it can be comprised by the recessed part or convex part provided in either one side of the small end surface 25a and the large end surface 25b of the tapered roller 25, and as the cage side fitting part 51, It can be comprised by the convex part or recessed part which fits the said roller side fitting part 51 in a holder | retainer side. For this reason, the freedom degree of design of this tapered roller bearing becomes high.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications are possible. As shown in FIG. In the case where the large chamfered portion 29a and the small chamfered portion 29b are provided, as the size and shape of each chamfered portion, when a tapered roller is disposed in the normal direction, the roller side fitting portion 50 is provided with the cage side fitting portion 51. When the tapered roller is arranged in the direction opposite to the normal direction, the cage side fitting portion 51 cannot be fitted to the roller side fitting portion 50. I just need it.

  Further, as shown in FIG. 9, when the concave-convex fitting structure M is composed of a convex portion formed on the small end surface 25 a of the roller 25 and a concave portion formed on the inner end surface 30 a of the annular member 30, Even if the concave portion of the inner end face 30a is a circular hole in the member 30, and a plurality of small protrusions are arranged at a predetermined pitch along the circumferential direction without forming a ring shape as a convex portion to be fitted to the concave portion. Good. Further, the outer shape of the convex portion and the inner shape of the concave portion are not limited to a circular shape, and can be variously changed within a range that does not impair the rotational motion when incorporated. Furthermore, the annular member 30 may have recesses in the inner end surface 30 a that open to the inner and outer diameter surfaces of the annular member 30.

  The uneven fitting structure M may be an uneven fitting structure opposite to the uneven fitting structure M shown in FIG. That is, a convex portion having a shape as shown in FIG. 9 may be formed on the inner end surface 30a of the annular member 30, and a concave portion having a shape as shown in FIG. 9 may be formed on the small end surface of the tapered roller.

  By the way, in each said embodiment, a tapered roller will be assembled according to the process shown in FIG. 2, and the annular member 30 is arrange | positioned at the small end surface side of the tapered roller 25 as an assembly process (regular assembly process) of a retainer. Or an annular member 31 is disposed on the large end face side of the tapered roller 25, or the pin member 32 is inserted through the through hole 29 of the tapered roller 25. For this reason, as the concavo-convex fitting structure M, the annular member 30 is disposed on the small end face side of the tapered roller 25, the annular member 31 is disposed on the large end face side of the tapered roller 25, or the tapered roller 25 is penetrated. What is necessary is just to be in a fitting state, when inserting the pin member 32 in the hole 29. FIG.

  The male screw portion 34 of the pin member 32 and the screw hole 37 into which the male screw portion 34 is screwed may be a straight screw or a taper screw. Further, the screw hole 37 is provided in the annular member 31, but the annular member 31 itself is not provided with a screw hole, but is provided with a through hole through which the male screw portion 34 of the pin member 32 is inserted. A nut member having a female thread communicating with the through hole may be provided on the outer end surface side of 31. The pin member is inserted in the normal direction, that is, the pin member 32 is inserted into the roller through hole 29 from the inner ring small diameter side, but conversely, the pin member 32 roller through hole from the inner ring large diameter side 29 may be inserted.

21 Raceway surface 22 Outer ring 23 Raceway 24 Inner ring 25a Small end surface 25b Large end surface 26 Cage 29 Through holes 29a, 29b Chamfered portions 30, 31 Annular member 32 Pin member 33 Pin member main body 34 Male screw portion 35 Head 36 Through hole 37 Screw hole 40 Bush 40a Protruding part 41, 42 Convex part 43, 45 Concave part 46 Washer

Claims (7)

An outer ring having a raceway surface on the inner periphery; an inner ring having a raceway surface on the outer periphery; a plurality of tapered rollers disposed between the outer ring raceway ring and the inner ring raceway ring; and a cage for holding the tapered roller; The tapered roller is a hollow roller in which a diameter difference that is a difference between a diameter of a small end surface and a diameter of a large end surface is 2 mm or less, and a through-hole extending along an axial direction is formed in an axis. The cage includes a pair of annular members disposed on the small end face side and the large end face side of the tapered roller, and a pin member that is inserted into a through hole of the tapered roller and connects the pair of annular members to each other. A roller bearing,
In the state where the tapered roller is arranged in a normal direction with respect to the inner ring, a concave / convex fitting structure that is fitted only in assembly in the normal direction of the cage is provided between the tapered roller and the cage. Tapered roller bearing.   A roller side fitting part consisting of a concave part or a convex part is provided on either the small end face or the large end face of the tapered roller, and the convex part or concave part fitting on the roller side fitting part is provided on the cage side. The tapered roller bearing according to claim 1, wherein a cage-side fitting portion is provided, and the concave-convex fitting structure is configured by the roller-side fitting portion and the cage-side fitting portion.   A roller side fitting part consisting of a recess is provided on either the small end face or the large end face of the tapered roller, and the roller side fitting is performed on the roller corresponding surface of the annular member facing the roller side fitting part. The tapered roller bearing according to claim 2, further comprising a cage side fitting portion including a convex portion fitted to the portion.   The roller side fitting part which consists of a recessed part was provided in any one side of the small end surface and large end surface of a tapered roller, and the said retainer side fitting part was comprised with the washer externally fitted to the said pin member. The tapered roller bearing according to claim 2.   A roller side fitting portion comprising a convex portion is provided on either the small end surface or the large end surface of the tapered roller, and the roller side fitting portion is provided on the roller corresponding surface of the annular member facing the roller side fitting portion. The tapered roller bearing according to claim 2, further comprising a cage side fitting portion including a concave portion to be fitted to the roller.   Chamfered portions are provided at both openings of the through hole of the tapered roller, and the chamfered portion on the small end surface side and the chamfered portion on the large end surface side are made different from each other. The tapered roller bearing according to claim 2, wherein the cage side fitting portion is configured by a bush fitted on the pin member.   Chamfered portions are provided at both openings of the through hole of the tapered roller, and the chamfered portion on the small end surface side and the chamfered portion on the large end surface side are made different from each other. The tapered roller bearing according to claim 2, wherein the cage side fitting portion is constituted by a protrusion provided on a roller corresponding surface of the annular member on the large chamfered portion side.

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