JP2006266304A - Double row conical roller bearing with aligning ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double row conical roller bearing with an aligning ring arranging conical rollers in each row in an all roller arranging condition and capable of preventing the conical roller from dropping when assembling the bearing to facilitate assembly work of the bearing. <P>SOLUTION: The conical rollers 2 in each row arranged in the all roller arranging condition are constituted in such a way that tips of two adjacent arm parts 6b having annular parts 6a being annularly continuous on small diameter end face 2a sides of the conical rollers 2 and a plurality of arm parts 6b overhanging in all the clearances on a cup 3 side between the conical rollers 2 in the all roller arranging condition from the annular parts 6a and overhanging in two sections on the opposite sides for each other in the circumferential direction of the annular part 6a are pressed and held onto a cone 4 side by cages 6 connected in a bridge part 6c to lock a large diameter end face 2b of the conical roller 2 and the conical rollers 2 in each row are assembled on conical raceway surfaces 4a of cones 4 stably so as to prevent the conical rollers 2 in each row from dropping by the cages 6 to assemble a pair of cones 4 on which the conical rollers 2 are assembled into cups 3 easily and facilitate assembly work of the bearing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a double-row tapered roller bearing with a centering ring, and more particularly to a double-row tapered roller bearing with a centering ring in which tapered rollers of each row are arranged in a full roller state.

  The pinch rolls and guide rolls that sandwich the slab continuously cast by the continuous casting equipment are thermally expanded by heat transfer from a high-temperature slab, so one end is supported by a bearing that fixes axial movement and the other end The side is supported by a bearing that is free to move axially. In addition, a pair of divided rolls divided in the width direction of the slab may be used for the guide roll. Even when this divided roll is used, one end side is supported by a bearing that fixes axial movement, and the other end side. Are supported by bearings that are free to move axially.

  Bearings that support the fixed side that fixes the axial movement of such pinch rolls and guide rolls are subjected to large radial and axial loads, and long rolls are deflected. Works. As bearings for preventing the occurrence of edge load, tapered rollers arranged in two rows with small-diameter end surfaces facing each other, and a conical raceway surface on which these two rows of tapered rollers roll are formed on the inner circumferential surface. An outer ring having a spherical convex surface on its surface, a pair of inner rings having a conical raceway surface on which each row of tapered rollers rolls on its outer peripheral surface, and a spherical shape that supports the outer peripheral surface of the outer ring having a spherical convex surface in a swingable manner. A double-row tapered roller bearing with a centering ring provided with a centering ring having a concave surface formed on the inner peripheral surface is proposed (see, for example, Patent Document 1), and the load of this double-row tapered roller bearing with a centering ring is also proposed. As means for increasing the capacity, it has been proposed to arrange the tapered rollers of each row in a full roller state (see, for example, Patent Document 2). Note that cylindrical roller bearings and self-aligning cylindrical roller bearings are used as bearings that support the free side that allows the pinch roll and guide roll to move in the axial direction.

JP-A-10-220467 (FIGS. 1 and 2) JP 2004-156751 A (Fig. 1-3)

  As described in Patent Document 2, double row tapered roller bearings with aligning rings in which tapered rollers of each row are arranged in a full roller state can increase the load capacity of the bearing and prevent the occurrence of edge load. When the tapered roller is assembled into the bearing in the full roller state, the tapered roller is likely to drop off, and there is a problem that it takes a lot of time to assemble the bearing.

  That is, in a normal double row tapered roller bearing in which the small-diameter end surfaces of two rows of tapered rollers are opposed, each row of tapered rollers is assembled to a conical raceway surface between a pair of large and small collars with a cage, The pair of inner rings assembled with the tapered rollers are assembled from both sides where the conical raceway surface of the outer ring expands. However, since the one described in Patent Document 2 does not have a cage, each row of tapered rollers is paired with a pair of tapered rollers. It is necessary to arrange in an unstable full-roller state on the conical raceway surface of the inner ring and incorporate it from both sides of the outer ring, and the tapered rollers simply arranged on the conical raceway surface of the inner ring are very likely to fall off.

  Although what was described in patent document 2 has also proposed mounting | wearing with the retaining ring on the outer side of the conical track surface of an outer ring | wheel, this retaining ring has the effect which prevents the fall of a tapered roller after a bearing assembly. There is almost no effect to prevent the tapered roller from falling off during the assembly of the bearing, and the assembly work of the bearing is also very troublesome. Further, if a retaining ring is mounted on the outer side of the conical raceway surface of the outer ring, the roller is shortened by that amount, and the load capacity is reduced.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent the tapered rollers from falling off when the bearings are assembled in a double row tapered roller bearing with a centering ring in which the tapered rollers of each row are arranged in a full roller state, thereby facilitating the assembly work of the bearings. It is to be.

  In order to solve the above problems, the present invention forms tapered rollers arranged in two rows with the small-diameter end faces facing each other, and a conical raceway surface on which these two rows of tapered rollers roll on the inner peripheral surface, An outer ring having a spherical convex surface on the outer peripheral surface, a pair of inner rings having a conical raceway surface on which the tapered rollers of each row roll on the outer peripheral surface, and an outer peripheral surface of the outer ring having the spherical convex surface are swingable. In a double row tapered roller bearing with a centering ring in which the tapered rollers of the respective rows are arranged in a full roller state, each of the rows arranged in the full roller state is provided. The structure provided with the holder | retainer which hold | suppresses and holds the tapered roller of a row | line | column to the said inner ring | wheel side was employ | adopted.

  That is, by providing a cage that holds the tapered rollers of each row arranged in a full roller state against the inner ring side, the tapered rollers of each row are stably held on the conical raceway surfaces of the pair of inner rings by the cage. Assemble the pair of inner rings with these tapered rollers easily from both sides where the conical raceway surface of the outer ring expands. It was to so.

  A retainer that holds and holds the tapered rollers of each row toward the inner ring side, an annular portion that is annularly continuous on the small diameter end surface side of each row of tapered rollers, and the tapered roller between the annular portions and the tapered rollers in the full-roller state. A plurality of arm portions projecting in all or every other gap on the outer ring side, and a locking portion for locking the large-diameter end surface of the tapered roller at at least one tip of these arm portions By providing this, the retainer and the tapered rollers arranged in the full roller state can be locked to each other by this locking portion, and a pair of inner rings to which the tapered rollers are assembled can be more easily assembled into the outer ring.

  The locking portion that locks the large-diameter end surface of the tapered roller can be a bridge portion that connects the tips of the adjacent arm portions so as to lock the large-diameter end surface of the tapered roller.

  The locking portion that locks the large-diameter end surface of the tapered roller may be a claw portion in which the tip of the arm portion is bent so as to lock the large-diameter end surface of the tapered roller.

  By providing a locking portion that locks the large-diameter end surface of the tapered roller at the tip of the arm portion that protrudes from the annular portion at two locations opposite to each other in the circumferential direction, The arranged tapered rollers can be locked more stably.

  By subjecting the surface of the tapered roller to the manganese phosphate salt film treatment, it is possible to prevent surface damage such as seizure when the tapered rollers are in contact with each other in the full roller state. In particular, when the bearing is used at a high load and at a low speed, it is difficult to form a lubricating oil film between the tapered rollers that are in contact with each other. Suitable for bearings.

  The above-mentioned double row tapered roller bearings with aligning rings are used to support a pinch roll or a guide roll roll that sandwiches a continuously cast slab of a continuous casting facility from both sides on a fixed side with fixed axial movement. Is preferred.

  The double row tapered roller bearing with the aligning ring of the present invention is provided with the cage that holds the tapered rollers of each row arranged in the full roller state toward the inner ring side, so the tapered rollers of each row are held by the cage. Assemble the pair of inner rings stably on the conical raceway surfaces of the pair of inner rings, and easily install the pair of inner rings assembled with these tapered rollers from both sides where the conical raceway surface of the outer ring expands. Therefore, the assembly work of the bearing can be easily performed.

  A retainer that holds and holds the tapered rollers of each row toward the inner ring side includes an annular portion that is annularly continuous on the small diameter end surface side of each row of tapered rollers, and an outer ring side between the annular portions and the tapered rollers in a full-roller state. By providing a plurality of arm portions projecting in all or every other gap, and by providing a locking portion for locking the large-diameter end surface of the tapered roller at the tip of at least one of these arm portions The retainer and the tapered rollers arranged in the full roller state are locked to each other by this locking portion, and a pair of inner rings with the tapered rollers assembled can be more easily assembled into the outer ring.

  By providing a locking portion for locking the large-diameter end surface of the tapered roller at the tip of an arm portion that protrudes from the annular portion at two locations opposite to each other in the circumferential direction, the cage and the full roller state are arranged. The tapered roller can be locked more stably.

  By subjecting the surface of the tapered roller to the manganese phosphate salt film treatment, it is possible to prevent surface damage such as seizure when the tapered rollers are in contact with each other in the full roller state. In particular, when the bearing is used at a high load and at a low speed, it is difficult to form a lubricating oil film between the tapered rollers that are in contact with each other. Suitable for bearings.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment. As shown in FIGS. 1 (a) and 1 (b), this double-row tapered roller bearing 1 with a centering ring has tapered rollers 2 arranged in a full-roller state in two rows with the small-diameter end faces 2a facing each other. A conical raceway surface 3a on which two rows of tapered rollers 2 roll is formed on the inner peripheral surface, an outer ring 3 having a spherical convex surface 3b formed on the outer peripheral surface, and a conical raceway surface 4a on which the tapered rollers 2 in each row roll. A pair of inner rings 4 formed on the outer peripheral surface and a centering ring 5 formed on the inner peripheral surface with a spherical concave surface 5a for swingably supporting the outer peripheral surface of the outer ring 3 formed with the spherical convex surface 3b. The tapered rollers 2 in each row arranged in the above are held by the cage 6 so as to be pressed toward the conical raceway surface 4a between the small collar 4b and the large collar 4c of the inner ring 4. Note that the surface of each tapered roller 2 is subjected to a manganese phosphate salt film treatment in order to prevent surface damage such as seizure due to contact in the full roller state.

  As shown in FIG. 2, the cage 6 includes an annular portion 6 a that is annularly continuous on the small diameter end surface 2 a side of each row of tapered rollers 2, and an outer ring 3 side between the annular portions 6 a and the tapered rollers 2 in a full roller state. Two adjacent arm portions projecting in all gaps and having a plurality of arm portions 6b for pressing the tapered roller 2 toward the inner ring 4 and projecting at two locations on the opposite sides in the circumferential direction of the annular portion 6a 6b is provided with a bridge portion 6c, which connects these tips, as a locking portion for locking the large-diameter end surface 2b of the tapered roller 2. Accordingly, the cage 6 and the tapered rollers 2 arranged in the full roller state are stably locked by the bridge portion 6c, and each of the tapered rollers 2 in the full roller state is stably held by the cage 6 so as not to fall off. Each inner ring 4 assembled with the conical raceway surface 4a of the inner ring 4 and the tapered rollers 2 can be easily assembled from both sides where the diameter of the conical raceway surface 3a of the outer ring 3 is increased.

  FIG. 3 shows a continuous casting facility using the above-mentioned double-row tapered roller bearing 1 with a centering ring and its pinch roll 14. This continuous casting equipment is for casting a slab for a steel plate. As shown in FIG. 3A, molten steel in a ladle 11 is cast into a mold 13 through a tundish 12, and the mold 13 The solidified high-temperature slab A in the surface layer portion is drawn downward at a low speed by the pinch roll 14 sandwiching the slab A. The slab A pulled out by the pinch roll 14 is sandwiched by a large number of guide rolls 15 and guided in a curved shape, cooled by spray cooling or the like, and then a predetermined length by a torch 16 disposed at the exit of the curved portion. Disconnected.

  As shown in FIG. 3 (b), the pinch roll 14 is supported by a fixed-side bearing housing 17a that fixes axial movement at one end and the free side that allows axial movement at the other end. The double-row tapered roller bearing 1 with the aligning ring is incorporated in the bearing housing 17a on the fixed side. A self-aligning cylindrical roller bearing 18 is incorporated in the free-side bearing box 17b. The double-row tapered roller bearing 1 with a centering ring can also be incorporated in a bearing box on the fixed side of the guide roll 15.

  4 and 5 show a modification of the first embodiment. This modification is different in that the arm portion 6b of the cage 6 protrudes every other gap on the outer ring 3 side between the tapered rollers 2 in the full-roller state, and is opposite to each other in the circumferential direction of the annular portion 6a. The ends of two adjacent arm portions 6b that protrude at two locations on the side are connected by a bridge portion 6c, as in the first embodiment.

  In the first embodiment and the modification described above, the ends of two adjacent arm portions 6b projecting at two locations opposite to each other in the circumferential direction of the annular portion 6a of the cage 6 are connected by the bridge portion 6c. However, you may connect the front-end | tip of two adjacent arm parts 6b which protrude in one place or three places or more of the circumferential direction of the annular part 6a with the bridge part 6c.

  6 (a), 6 (b) and 7 show a second embodiment. This double-row tapered roller bearing 1 with a centering ring has the same basic configuration as that of the first embodiment, and is held over all gaps on the outer ring 3 side between the tapered rollers 2 in the full-roller state. As a locking portion for locking the large diameter end surface 2b of the tapered roller 2, a claw portion 6d bent toward the inner diameter side to lock the large diameter end surface 2b is provided at the tip of each arm portion 6b of the container 6. Only the point is different.

  8 and 9 show a modification of the second embodiment. This modification is different in that the arm portion 6b of the cage 6 protrudes into every other gap on the outer ring 3 side between the tapered rollers 2 in the full-roller state. Similar to the second embodiment, a claw portion 6d that is bent toward the inner diameter side is provided.

  In the second embodiment and the modification described above, the claw portions 6d are provided at the tips of all the arm portions 6b of the cage 6. However, these claw portions 6d are not necessarily provided at the tips of all the arm portions 6b. Alternatively, it may be provided at the tip of only one arm portion 6b.

  The double-row tapered roller bearing with the aligning ring according to the present invention is not limited to the one supporting the fixed side of the pinch roll or guide roll of the continuous casting equipment, and is loaded with a radial load and an axial load. It can be used for supporting a general deflection shaft.

a is a partially omitted longitudinal sectional view showing a double-row tapered roller bearing with a centering ring of the first embodiment, and b is a side view of a. FIG. 1 is an external perspective view showing the cage of FIG. a is an external perspective view showing a continuous casting facility using the double-row tapered roller bearing with a centering ring of FIG. 1, and b is a partially omitted vertical sectional view showing a pinch roll of a. Side view showing a variation of FIG. FIG. 4 is a partially omitted perspective view showing the cage of FIG. a is a partially omitted longitudinal sectional view showing a double row tapered roller bearing with a centering ring of the second embodiment, and b is a side view of a. FIG. 6 is a partially omitted perspective view showing the cage of FIG. Side view showing a modification of FIG. FIG. 8 is a partially omitted perspective view showing the cage of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Double row tapered roller bearing with a centering ring 2 Tapered roller 2a Small-diameter end surface 2b Large-diameter end surface 3 Outer ring 3a Raceway surface 3b Spherical convex surface 4 Inner ring 4a Raceway surface 4b Small cage 4c Large bowl 5 Spherical concave surface 6 Cage 6a Annular part 6b Arm part 6c Bridge part 6d Claw part 11 Ladle 12 Tundish 13 Mold 14 Pinch roll 15 Guide roll 16 Torch 17a, 17b Bearing box 18 Self-aligning cylindrical roller bearing

Claims (7)

  Tapered rollers arranged in two rows with the small-diameter end surfaces facing each other, an outer ring formed with a conical raceway surface on which these two rows of tapered rollers roll, and a spherical convex surface on the outer circumferential surface; A pair of inner rings formed on the outer peripheral surface with conical raceway surfaces on which the tapered rollers of the row roll, and a spherical concave surface supporting the outer peripheral surface of the outer ring formed with the spherical convex surface on the inner peripheral surface so as to be swingable. In a double row tapered roller bearing with a centering ring in which the tapered rollers of each row are arranged in a full roller state, the tapered rollers in each row arranged in the full roller state are pressed and held toward the inner ring side. A double-row tapered roller bearing with an aligning ring, characterized in that a cage is provided.   A retainer that holds and holds the tapered rollers of each row toward the inner ring side, an annular portion that is annularly continuous on the small diameter end surface side of each row of tapered rollers, and the tapered roller between the annular portions and the tapered rollers in the full-roller state. A plurality of arm portions projecting in all or every other gap on the outer ring side, and a locking portion for locking the large-diameter end surface of the tapered roller at at least one tip of these arm portions A double-row tapered roller bearing with a centering ring according to claim 1, wherein   The locking portion that locks the large-diameter end surface of the tapered roller is a bridge portion that connects the tip of the adjacent arm portion so as to lock the large-diameter end surface of the tapered roller. Double row tapered roller bearing with aligning ring.   3. The adjustment according to claim 2, wherein the locking portion that locks the large-diameter end surface of the tapered roller is a claw portion in which a tip of the arm portion is bent so as to lock the large-diameter end surface of the tapered roller. Double row tapered roller bearing with a center ring.   The locking portion for locking the large-diameter end surface of the tapered roller is provided at the tip of the arm portion that protrudes from the annular portion at two locations opposite to each other in the circumferential direction. Double-row tapered roller bearing with aligning ring as described.   The double-row tapered roller bearing with a centering ring according to any one of claims 1 to 5, wherein a surface of the tapered roller is subjected to a manganese phosphate salt coating treatment.   The double-row tapered roller bearing with a centering ring supports a pinch roll or a guide roll for sandwiching a continuously cast slab of a continuous casting facility from both sides on a fixed side where its axial movement is fixed. A double-row tapered roller bearing with a centering ring according to any one of 1 to 6.

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