JP6603157B2 - Tapered roller bearing - Google Patents

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. 11 and 12, such a tapered roller bearing includes an outer ring 2 having a raceway surface 1 on an inner periphery, an inner ring 4 having a raceway surface 3 on an 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. 11 and 12, 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. 11 and 12, 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. 9, 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. 10, the small end surface 5a and the large end surface 5b are difficult to distinguish, and as shown in FIG. 10, 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, wherein in the through hole of the tapered roller, the hole diameter on the small end surface side is different from the hole diameter on the large end surface side, and the outer shape of the pin member inserted through the through hole is A shape corresponding to the shape of the through hole, small end face side or large end It is obtained by permitting insertion into the through hole of the pin member of one of the side in only one direction.

  According to the tapered roller bearing of the present invention, the tapered roller is disposed in a direction opposite to the normal direction because it allows insertion of the pin member in only one direction of the small end surface side or the large end surface side into the through hole. In such a case, the pin member can be set so as not to be inserted even if the pin member is to be inserted from the normal direction.

  The tapered roller has a through-hole having a large-diameter hole portion and a small-diameter hole portion, and the pin member has a pin member main body having a large-diameter shaft portion and a small-diameter shaft portion. A pair of annular members may be connected to each other in a state where the small diameter shaft portion side of the pin member main body of the member is inserted. In this case, if the small diameter shaft portion side of the pin member body of the pin member is inserted through the large diameter hole portion of the through hole, first, the small diameter shaft portion of the pin member body passes through the large diameter hole portion of the through hole, Thereafter, the large-diameter shaft portion of the pin member main body is inserted into the large-diameter hole portion of the through hole, and the pin member can be penetrated into the through-hole. In contrast, if the small diameter shaft portion side of the pin member is inserted through the small diameter hole portion of the through hole, the small diameter shaft portion of the pin member is first inserted into the small diameter hole portion of the through hole, and then the large diameter shaft Although it is necessary for the portion to pass through the small diameter hole portion, the large diameter shaft portion cannot be inserted into the small diameter hole portion.

  In the case where the through hole of the tapered roller has a large diameter hole portion and a small diameter hole portion, it can be set so that the large diameter hole portion of the through hole of the tapered roller is disposed on the inner ring small diameter side. By setting in this way, the pin member is inserted from the inner ring small diameter side.

  The through hole of the tapered roller is a tapered hole whose hole diameter changes along the axial direction, and the pin member has a tapered pin member main body whose outer diameter changes along the axial direction. The pair of annular members may be connected to each other in a state where the small diameter side of the pin member main body of the pin member is inserted from the large diameter side opening of the through hole.

  In this configuration, when the small-diameter side of the pin member body of the pin member is inserted from the large-diameter side opening of the through-hole, from the through-hole insertion side to the through-hole outlet, the diameter gradually increases from the large diameter. Therefore, the pin member having the tapered pin member main body can be inserted through the through hole. On the other hand, when the direction of the tapered roller is opposite to the normal direction, if the pin member is inserted in the direction with respect to the normal direction roller, it is inserted from the opening on the small diameter side of the through hole. Will do. With such insertion, pin members whose diameter gradually increases from the distal end side toward the proximal end side are inserted into the through holes whose diameter increases sequentially from the insertion side toward the outlet side. For this reason, the pin member is caught in the through hole during insertion and cannot be inserted.

  It can be set so that the large diameter side of the tapered hole of the through hole of the tapered roller is arranged on the small diameter side of the inner ring. By setting in this way, the pin member is inserted from the inner ring small diameter side.

  In the present invention, when the tapered roller is arranged in the direction opposite to the normal direction, the pin member can be set not to be inserted even if it is attempted to be inserted from the normal direction. For this reason, it can be grasped that the tapered rollers that cannot be inserted are arranged in the direction opposite to the normal direction, and the reverse mounting of the tapered rollers 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 tapered roller bearing of this invention. 1 shows a method for assembling the tapered roller bearing shown in FIG. 1, (a) is a cross-sectional view of a main part before the pin member is inserted, and (b) is a main part in a state where the tapered roller is sandwiched between a pair of annular members. It is sectional drawing, (c) is sectional drawing of the state which mounted | wore the pin member. The relationship between the tapered roller and the pin member shown in FIG. 1 is shown, (a) is a cross-sectional view of a state in which the pin member is arranged in the normal direction with respect to the normal direction roller, and (b) is a normal direction roller. FIG. 6C is a cross-sectional view of a state in which the pin member is being inserted in the normal direction with respect to FIG. 1 shows the relationship between the tapered roller and the pin member shown in FIG. 1, (a) is a cross-sectional view of a state in which the pin member is arranged in the normal direction with respect to the roller opposite to the normal direction, and (b) is the normal direction It is sectional drawing of the state in the middle of inserting the pin member in the normal direction with respect to the roller of the reverse direction. It is principal part sectional drawing of the tapered roller bearing which shows other embodiment of this invention. 5 shows a method for assembling the tapered roller bearing shown in FIG. 5, (a) is a sectional view of the principal part before the pin member is inserted, and (b) is a principal part in a state where the tapered roller is sandwiched between a pair of annular members. It is sectional drawing, (c) is sectional drawing of the state which mounted | wore the pin member. 5 shows the relationship between the tapered roller and the pin member shown in FIG. 5, (a) is a cross-sectional view of a state in which the pin member is arranged in the normal direction with respect to the normal direction roller, and (b) is a normal direction roller. FIG. 6C is a cross-sectional view of a state in which the pin member is being inserted in the normal direction with respect to FIG. 5 shows the relationship between the tapered roller and the pin member shown in FIG. 5, (a) is a cross-sectional view in a state where the pin member is arranged in the normal direction with respect to the roller opposite to the normal direction, and (b) is the normal direction. It is sectional drawing of the state in the middle of inserting the pin member in the normal direction with respect to the roller of the reverse direction. It is principal part sectional drawing of the tapered roller bearing of the state by which the roller was arrange | positioned in the direction of regular orientation. It is principal part sectional drawing of the tapered roller 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. 3A, 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. The through hole 29 includes a large diameter hole portion 29a on the small end surface 25a side and a small diameter hole portion 29b on the large end surface 25b side. In the through hole 29, a stepped portion 29 c between the large diameter hole portion 29 a and the small diameter hole portion 29 b is located at a substantially intermediate portion in the axial direction of the tapered roller 25. That is, the axial length of the large diameter hole 29a and the axial length of the small diameter hole 29b are set to be substantially the same.

  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 includes a pin member main body 33 composed of a large-diameter shaft portion 33a on the base side and a small-diameter shaft portion 33b on the tip portion side, and a male connected to the tip of the small-diameter shaft portion 33b of the pin member main body 33. And a threaded portion 34. The outer diameter of the male screw portion 34 and the outer diameter of the small-diameter shaft portion 33b are set to be the same. Further, a head portion 35 is connected to the outer end surface of the large diameter shaft portion 33 a of the pin member main body 33.

  As shown in FIG. 3A, the outer diameter dimension Da1 of the large diameter shaft portion 33a is set slightly smaller than the inner diameter dimension Da2 of the large diameter hole portion 29a of the through hole 29 of the roller 25, and the small diameter shaft portion 33b. The outer diameter Db1 is set slightly smaller than the inner diameter Db2 of the small diameter hole 29b of the through hole 29 of the roller 25. That is, Da1 <Da2 and Db1 <Db2. Further, the inner diameter Db2 of the small diameter hole portion 25b of the through hole 29 needs to be set smaller than the outer diameter dimension Da1 of the large diameter shaft portion 33a, and Db2 <Da1.

  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 roller. A bush 58 is fitted into the through hole 36, and a spot facing portion 36 a is provided at the opening of the through hole 36 on the outer end surface 30 b side.

  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 roller.

  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 23 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 23. Are arranged so as to face each other on the large end surface 25b of the tapered roller 25 fitted in the shape. At this time, the annular member 31 is received by a receiving member (jig) (not shown). For this reason, in the tapered roller 25, the large diameter hole portion 29a of the through hole 29 is positioned on the upper side, and the small diameter hole portion 29b of the through hole 29 is disposed on the lower side.

  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, as shown in FIG. 3A, the pin member 32 is inserted into the through hole 29 along the axis of the tapered roller 25 as indicated by an arrow. At this time, as shown in FIG. 3B, the male screw portion 34 to the small diameter shaft portion 33 b of the pin member 32 enter the small diameter hole portion 29 b of the through hole 29 through the large diameter hole portion 29 a of the through hole 29. If it is further inserted in the direction of the arrow, the small diameter shaft portion 33b of the pin member 32 corresponds to the small diameter hole portion 29b of the through hole 29 as shown in FIG. The large-diameter hole portion 29a of the pin member 32 can correspond to the radial hole portion 29a. This is because Da1 <Da2 and Db1 <Db2 are set as shown in FIG.

  For this reason, in a state where the male screw portion 34 of the pin member 32 protrudes 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 screw. The head 35 of the pin member 32 is used for this screwing. As shown in FIG. 2C, in the state where the male thread portion 34 of the pin member 32 is screwed into the screw hole 37 of the annular member 31, the base portion (anti-small diameter shaft) of the large diameter shaft portion 33a of the pin member 32 is obtained. The portion side) is in a state of loosely fitting into the through hole 36 of the annular member 30. Therefore, the bush 38 is fitted into the through hole 36 and the head 35 or its vicinity is welded to fix the annular member 30. The annular member 30 may be set in a state where the bush 38 is fitted (attached) to the through hole 36, and then the pin member 32 may be inserted into the through hole 29. Further, such a bush 38 may be omitted.

  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. 2, when the tapered roller 25 is arrange | positioned in a regular direction, the pin member 32 can be penetrated to the through-hole 29 of the tapered roller 25 from a regular direction. 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. Further, the insertion of the pin member 32 into the through hole 29 of the tapered roller 25 from the normal direction means that the pin member 32 is inserted from the small diameter side of the inner ring 23 along the axial direction of the through hole 29 of the tapered roller 25. Is to insert into.

  Thus, if the tapered roller 25 is arranged in the normal direction, the pin member 32 can be inserted into the through hole 29 of the tapered roller 25 from the normal direction. However, if the tapered roller 25 is arranged in a direction opposite to the normal direction, the pin member 32 cannot be inserted into the through hole 29 of the tapered roller from the normal direction.

  That is, the tapered roller 25 is disposed in the direction opposite to the normal direction. 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. In this state, when the pin member 32 is inserted into the through hole 29 of the tapered roller from the normal direction, the pin member 32 is inserted into the through hole 29 from the state shown in FIG.

  In this case, the large end surface 25b faces the pin member 32 side, and the small diameter hole portion 29b of the through hole 29 is disposed on the pin member 32 side. For this reason, if the pin member 32 is inserted in the arrow direction from the state shown in FIG. 4A, the small-diameter shaft portion 33b of the pin member 32 becomes the small-diameter hole of the through-hole 29 as shown in FIG. Up to the portion 29b can be inserted. However, when the outer diameter dimension of the large-diameter shaft portion 33a of the pin member 32 is Da1 and the inner diameter dimension of the small-diameter hole portion 29b of the through-hole 29 is Db2, Da1> Db2 is set. ), A stepped portion (stepped portion) 33c between the large-diameter shaft portion 33a and the small-diameter shaft portion 33b of the pin member 32 is formed on the large end face side opening edge of the small-diameter hole portion 29b of the through hole 29. It can not be inserted in the direction of the arrow any more. For this reason, if the tapered roller 25 is arrange | positioned in the reverse direction, the holder | retainer 26 cannot be assembled.

  As described above, when the tapered roller 25 shown in FIG. 1 is arranged in the direction opposite to the normal direction, the pin member 32 cannot be inserted from the normal direction. Therefore, it can be grasped that the tapered roller 25 that cannot be inserted is arranged in the direction opposite to the normal direction, and the reverse mounting of the tapered roller 25 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.

  Next, FIG. 5 shows another embodiment, and the through hole 29 of the tapered roller 25 in this case is a tapered hole 41 whose hole diameter size changes along the axial direction. Specifically, the diameter gradually decreases along the axial direction from the small end face 25a side to the large end face 25b, and the opening on the small end face 25a side has a larger diameter than the opening on the large end face 25b. .

  The pin member 32 also has a tapered pin member body 40 whose outer diameter changes along the axial direction. Specifically, the pin member main body 40 of the pin member 32 is a taper shaft whose outer diameter is gradually reduced from the head 35 to the male screw portion 34, and the head 35 side is larger than the male screw portion 34. It is the diameter.

  In this case, as shown in FIG. 7A, the maximum outer diameter of the pin member body 40 is Da3, the maximum inner diameter of the taper hole 41 is Db3, and the minimum outer diameter of the pin member body 40 (the outer diameter of the male screw). Is Da4 and the minimum inner diameter of the tapered hole 41 is Db4, Da3 <Db3, Da4 <Db4, and Db4 <Da3. Further, as shown in FIG. 7B, when the outer diameter of the axial intermediate portion of the pin member body 40 is Da5 and the inner diameter of the axial intermediate portion of the tapered hole 41 is Db5, Da5 <Db5, Db5 <Da3. In this case, the taper angle of the taper hole 41 and the taper angle of the pin member main body 40 are substantially the same.

  Since the other configuration of the tapered roller bearing shown in FIG. 5 is the same as the configuration of the tapered roller bearing shown in FIG. 1, the same members are denoted by the same reference numerals in FIG. Omitted.

  FIG. 6 shows an assembling method of the tapered roller bearing shown in FIG. This assembling method is the same as the assembling method shown in FIG. That is, as shown in FIG. 6A, the large-diameter side end surface 24a of the inner ring 23 is directed downward, and the annular member 31 (the annular member 31 having the screw hole 37) is placed on the raceway surface of the inner ring 23. The roller 25 fitted in the shape 21 is disposed so as to face the large end surface. At this time, the annular member 31 is received by a receiving member (jig) (not shown). For this reason, in the tapered roller 25, the large diameter side of the through hole 29 is positioned on the upper side, and the small diameter side of the through hole 29 is disposed on the lower side.

  Next, as shown in FIG. 6B, the 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, as shown in FIG. 7A, the pin member 32 is inserted into the through hole 29 as indicated by the arrow along the axis of the tapered roller 25. At this time, the male thread portion 34 or the tapered pin member main body 40 of the pin member 32 enters the through hole 29 through the large diameter hole portion 29a of the through hole 29 as shown in FIG. If it is further inserted in the direction of the arrow, the tapered pin member main body 40 can be inserted into the through hole 29 as shown in FIG. This is because Da3 <Db3, Da4 <Db4, Db4 <Da3, Da5 <Db5, and Db5 <Da3.

  For this reason, if the male threaded portion 34 of the pin member 32 protrudes from the through hole 29 of the tapered roller 25 and the male threaded portion 34 of the pin member 32 is screwed into the threaded hole 37 of the annular member 31. As shown in FIG. 6C, it can be screwed. The head 35 of the pin member 32 is used for this screwing. Then, as shown in FIG. 6C, in the state where the male thread portion 34 of the pin member 32 is screwed into the screw hole 37 of the annular member 31, the base portion (anti-small diameter shaft portion) of the pin member main body 40 of the pin member 32. The side) is in a state of being loosely fitted into the through hole 36 of the annular member 30. Therefore, the bush 38 is fitted into the through hole 36 and the head 35 or the vicinity thereof is welded to fix the pin member 32 to the annular member 30. Also in this case, the annular member 30 may be set in a state where the bush 38 is fitted (attached) to the through hole 36, and then the pin member 32 may be inserted into the through hole 29. Further, such a bush 38 may be omitted.

  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. The tapered roller bearing shown in FIG. 5 can be assembled by assembling the unit body and the outer ring 22.

  By the way, in the tapered roller 25 shown in FIG. 6, if the tapered roller 25 is arranged in the normal direction, the pin member 32 can be inserted into the through hole 29 of the tapered roller from the normal direction. However, if the tapered roller 25 is disposed in a direction opposite to the normal direction, the pin member 32 cannot be inserted into the through hole 29 of the tapered roller 25 from the normal direction.

  That is, the tapered roller 25 is disposed in the direction opposite to the normal direction. 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. In this state, when the pin member 32 is inserted into the through hole 29 of the tapered roller from the normal direction, the pin member 32 is inserted into the through hole 29 from the state shown in FIG.

  In this case, the large end surface 25b faces the pin member 32 side, and the small diameter side of the through hole 29 is arranged on the pin member 32 side. For this reason, if the pin member 32 is inserted as shown by an arrow from the state shown in FIG. 8A, the male screw portion 34 side of the pin member main body 40 of the pin member 32 is shown in FIG. 8B. Can be inserted up to the opening on the large end face side of the taper hole 41. However, when the maximum outer diameter of the pin member main body 40 is Da3 and the inner diameter of the taper hole 41 is Db5, the pin member main body 40 is in the axial direction of the taper hole 41. At the intermediate part, it becomes engaged and further insertion in the direction of the arrow becomes impossible.

  As described above, even in the tapered roller bearing shown in FIG. 5, when the tapered roller 25 is disposed in the direction opposite to the normal direction, the pin member 32 cannot be inserted from the normal direction. For this reason, it can grasp | ascertain that the tapered roller 25 which cannot be penetrated is arrange | positioned in the reverse direction with respect to a normal direction, and can avoid the reverse mounting of the tapered roller 25. FIG. That is, the same effect as the tapered roller bearing shown in FIG.

  As described above, in the tapered roller bearing, even the tapered roller 25 having the through hole 29 including the small diameter hole portion 29b and the large diameter hole portion 29a as shown in FIG. 1 is tapered as shown in FIG. The tapered roller 25 having the through hole 29 formed by the hole 41 may be used. That is, the hole diameter on the small end face 25a side and the hole diameter on the large end face 25b side are made different, and the outer shape of the pin member 32 inserted into the through hole 29 may be a shape corresponding to the hole shape of the through hole 29. The roller 25 is excellent in design and productivity.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications are possible. As shown in FIG. 1, the small-diameter hole portion 29b and the large-diameter hole portion 29a are provided. When the tapered roller 25 having the through hole 29 is used, the difference in diameter between the small diameter hole portion 29b and the large diameter hole portion 29a, the difference in diameter between the small diameter shaft portion 33b and the large diameter shaft portion 33a of the pin member 29, and the small diameter hole The axial lengths of the portion 29b and the large-diameter hole portion 29a and the axial lengths of the small-diameter shaft portion 33b and the large-diameter shaft portion 33a are such that the pin member is oriented in the normal direction with respect to the rollers in the normal posture. The pin member 32 can be variously set in a range in which the pin member 32 cannot be inserted in the normal direction with respect to the roller in the normal direction and the reverse direction.

  When the tapered roller 25 having the tapered hole 41 is used, the diameter difference between the small diameter side and the large diameter side, the diameter difference between the small diameter side and the large diameter side of the pin member 32, the taper angle of the taper hole 41, and the taper of the pin member 32. As for the angle, the pin member 32 can be inserted in the normal direction with respect to the tapered roller 25 in the normal posture, and the pin member 32 cannot be inserted in the normal direction with respect to the tapered roller 25 in the direction opposite to the normal direction. Various settings can be made.

  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.

  Furthermore, in the above-described embodiment, the pin member is inserted in the normal direction, that is, the pin member 32 is inserted into the through hole 29 of the roller from the inner ring small-diameter side. The member 32 may be inserted into the through hole 29 of the roller. In this case, as shown in FIG. 1, if the insertion hole 29 has a small diameter hole portion 29b and a large diameter hole portion 29a, the small diameter hole portion 29b is provided on the large end face 25b side, and the large diameter hole portion 29a is provided. Are provided on the small end surface 25a side, and one annular member 30 is disposed on the large end surface 25b side, and the other annular member 31 is disposed on the small end surface 25a side. As shown in FIG. 5, if the insertion hole 29 is a tapered hole 41, the small diameter side is provided on the large end face 25b side, the large diameter side is provided on the small end face 25a side, and one annular shape is provided. It is necessary to arrange the member 30 on the large end face 25b side and the other annular member 31 on the small end face 25a side.

21, 23 Raceway surface 22 Outer ring 24 Inner ring 25 Tapered roller 25a Small end surface 25b Large end surface 26 Cage 29 Through hole 29a Large diameter hole 29b Small diameter hole 30, 31 Annular member 32 Pin member 33, 40 Pin member main body 33a Large diameter Shaft portion 33b Small diameter shaft portion 34 Male thread portion 37 Screw hole 41 Tapered hole

Claims (5)

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 through hole of the tapered roller, the hole diameter on the small end face side is different from the hole diameter on the large end face side, and the outer shape of the pin member inserted through the through hole is made to correspond to the hole shape of the through hole, and the small end face side Alternatively, the tapered roller bearing is characterized in that the pin member is allowed to be inserted into the through hole only in any one direction on the large end face side.   The tapered roller has a through-hole having a large-diameter hole portion and a small-diameter hole portion, and the pin member has a pin member main body having a large-diameter shaft portion and a small-diameter shaft portion. The tapered roller bearing according to claim 1, wherein the pair of annular members are connected to each other in a state where the small diameter shaft portion side of the pin member main body of the member is inserted.   The tapered roller bearing according to claim 2, wherein a large-diameter hole portion of the through hole of the tapered roller is arranged on the inner ring small-diameter side.   The through hole of the tapered roller is a tapered hole whose hole diameter changes along the axial direction, and the pin member has a tapered pin member main body whose outer diameter changes along the axial direction. 2. A tapered roller according to claim 1, wherein the pair of annular members are connected to each other in a state where the tip small diameter portion of the shaft portion of the pin member is inserted from the large diameter opening portion of the through hole. bearing. The tapered roller bearing according to claim 4, wherein the large diameter side of the tapered hole of the through hole of the tapered roller is disposed on the small inner diameter side of the inner ring.

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