JP2013053696A - Tapered roller bearing for roll neck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tapered roller bearing for a roll neck capable of prolonging the service life of the tapered roller bearing.SOLUTION: The tapered roller bearing has a plurality of retainers 16 holding a plurality of tapered rollers 15 in a circumferential direction in a substantially the same interval. The retainers 16 have large diameter side annulus ring parts 16a, small diameter side annulus ring parts 16b arranged coaxially with the large diameter side annulus ring parts 16a, a plurality of column parts 16c coupling the large diameter side annulus ring parts 16a and the small diameter side annulus ring parts 16b in an axial direction and arranged in the circumferential direction in a substantially the same interval, and pockets 16d formed between the column parts 16c adjacent in a circumferential direction and turnably holding the tapered rollers 15. Ribs 16e extending from the large diameter side annulus ring part 16a side to the small diameter side annulus ring part 16b sides of the retainers 16 and obliquely extending to a rotational direction of the retainers 16 are arranged in the outer peripheral face of the column parts 16c.

Description

  The present invention relates to a tapered roller bearing for a roll neck, and more particularly to a tapered roller bearing for a roll neck that is suitably used for a rolling mill of a steel facility.

  Tapered roller bearings used in roll necks of steel rolling mills are used in harsh environments where the temperature changes drastically and water or other fluids may be applied. In many cases, the bearing life tends to be shortened due to damage to the outer ring. For this reason, in a tapered roller bearing for a roll neck, improvement of the lubrication state is an important issue.

  As a conventional tapered roller bearing, a convex rib is provided on the inner peripheral surface on the small diameter side of the cage pillar, thereby enhancing the draining effect of lubricant such as grease and reducing the amount of lubricant remaining in the bearing. One that reduces the stirring torque is known (for example, see Patent Document 1).

  Further, as a conventional tapered roller bearing for a roll neck, a protruding wall extending toward the inner diameter side is provided on the inner periphery of the outer ring spacer, and the lubricant flows from the small collar part side to the large collar part side of the inner ring by the pump effect. Is replenished by hitting the protruding wall and returning to the side of the large collar (see, for example, Patent Document 2).

JP 2010-14193 A JP 2003-65344 A

  However, in the tapered roller bearing described in Patent Document 1 described above, the amount of retained lubricant is reduced and the stirring torque is reduced, but the lubricant is actively discharged to the large collar portion side of the inner ring, The lubricant is not supplied from the small collar part side to the large collar part side of the inner ring due to the pump effect. That is, in the tapered roller bearing described in Patent Document 1, the lubricant is supplied to the side of the large collar that does not serve as a lubricant supply source, and there is room for improvement in extending the life of the tapered roller bearing. It was.

  Further, in the tapered roller bearing for roll neck described in Patent Document 2, the lubricant that has flowed out from the small collar side of the inner ring to the large collar part by the pump effect can be reused. There was no consideration of returning the lubricant that had flowed out to the side of the collar.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a tapered roller bearing for a roll neck that can extend the life of the tapered roller bearing.

The above object of the present invention can be achieved by the following constitution.
(1) A plurality of outer rings provided with a raceway surface on the inner peripheral surface, a plurality of inner rings provided with a raceway surface on the outer peripheral surface, and a plurality of tapered rollers disposed between the raceway surface of the outer ring and the raceway surface of the inner ring And a plurality of cages that hold the plurality of tapered rollers at substantially equal intervals in the circumferential direction, and the plurality of cages are arranged coaxially with the large-diameter side annular portion and the large-diameter side annular portion. The small-diameter-side annular portion, the large-diameter-side annular portion and the small-diameter-side annular portion are connected in the axial direction, and a plurality of column portions provided at substantially equal intervals in the circumferential direction, Tapered roller bearings for roll necks that are formed between adjacent column portions and each hold a tapered roller in a rollable manner, and are arranged on the outer diameter side of the retainer column portion on the large diameter side of the retainer. A rib that extends from the annular part side toward the small-diameter side annular part side and that extends obliquely with respect to the rotation direction of the cage is provided. Tapered roller bearings for roll neck which is characterized.
(2) The tapered roller bearing for a roll neck according to (1), wherein the rib is provided in each column portion of the cage.
(3) The ribs are provided in a pair on the pillar portion of the cage, and the circumferential interval between the pair of ribs gradually decreases from the large-diameter side annular portion side toward the small-diameter side annular portion side. The tapered roller bearing for a roll neck according to (1) or (2).
(4) The tapered roller bearing for a roll neck according to any one of (1) to (3), wherein the rib is provided over the entire axial range of the outer peripheral surface of the column portion.
(5) The tapered roller bearing for a roll neck according to any one of claims (1) to (3), wherein the rib is provided in a portion of the pillar portion on the large-diameter side annular portion side.
(6) The roll according to any one of (1) to (5), wherein the height of the rib gradually decreases from the large-diameter side annular portion side toward the small-diameter side annular portion side. Tapered roller bearing for neck.
(7) The tapered roller bearing for a roll neck according to any one of (1) to (6), wherein the tapered roller bearing is a four-row tapered roller bearing.
(8) The tapered roller bearing for a roll neck according to any one of (1) to (7), which is mounted on a roll neck of a steel rolling mill.

  According to the present invention, the outer peripheral surface of the pillar portion of the cage extends from the large-diameter-side annular portion side of the cage toward the small-diameter-side annular portion side, and extends obliquely with respect to the rotation direction of the cage. Since the rib is provided, the lubricant that has flowed out from the small collar part side to the large collar part side by the pump effect can be returned from the large collar part side to the small collar part side, and the lubricant can be circulated inside the bearing. Thereby, since the lubrication state inside a bearing can be kept favorable, the lifetime of a tapered roller bearing can be extended.

It is principal part sectional drawing explaining one Embodiment of the tapered roller bearing for roll necks concerning this invention. It is a schematic diagram explaining the flow of the lubricant at the time of forward rotation of the cage. It is a schematic diagram explaining the flow of the lubricant at the time of reverse rotation of the cage. It is principal part sectional drawing explaining the 1st modification of the tapered roller bearing for roll necks concerning this invention. It is principal part sectional drawing explaining the 2nd modification of the tapered roller bearing for roll necks concerning this invention. It is principal part sectional drawing explaining the 3rd modification of the tapered roller bearing for roll necks concerning this invention.

  Hereinafter, an embodiment of a tapered roller bearing for a roll neck according to the present invention will be described in detail based on the drawings.

  As shown in FIG. 1, a roll neck tapered roller bearing (hereinafter also referred to as “tapered roller bearing”) 10 of the present embodiment is a four-row tapered roller bearing, and includes a pair of outer rings 11 and a double-row outer ring (outer ring). 12, a pair of double-row inner rings (inner rings) 13, 14, and a plurality of cones respectively disposed between the raceways 11 a, 12 a of the outer rings 11, 12 and the raceways 13 a, 14 a of the inner rings 13, 14. The roller 15 and the four retainers 16 that rotatably hold the plurality of tapered rollers 15 at substantially equal intervals in the circumferential direction, and are mounted on a roll neck of a steel rolling mill.

  An outer ring spacer 17 is arranged between the double row outer ring 12 arranged in the center in the axial direction and the outer ring 11 arranged on both sides in the axial direction, and the pair of outer rings 11 and the double row outer ring are arranged. 12 axial positionings are performed.

  A large collar portion 21 is formed at the center of each of the double row inner rings 13 and 14, and small collar portions 13c, 13d, 14c and 14d are formed at both ends of the double row inner rings 13 and 14, respectively. Yes. When the bearing is used, the tapered roller 15 rolls on the raceway surfaces 11a, 12a, 13a and 14a while being guided by the small flange portions 13c, 13d, 14c and 14d and the large flange portions 21 and 21.

  In addition, annular step portions 13e and 14e are formed on the inner peripheral surfaces of the small flange portions 13c and 14c, which are end portions of the double row inner rings 13 and 14 that face each other, so as to face each other. , 14e, an intermediate seal 23 is attached to the recess 22.

  As shown in FIGS. 1 and 2, the cage 16 includes a large-diameter-side annular portion 16a, a small-diameter-side annular portion 16b arranged coaxially with the large-diameter-side annular portion 16a, and a large-diameter-side annular portion. 16a and the small-diameter-side annular portion 16b are connected in the axial direction, and are formed between a plurality of column portions 16c provided at substantially equal intervals in the circumferential direction and column portions 16c adjacent to each other in the circumferential direction. And a pocket 16d for holding 15 in a rollable manner. The four cages 16 are assembled to the inner rings 13 and 14 so that the large-diameter side annular portions 16a face each other in a set of two.

  A pair of ribs 16e extending from the large-diameter-side annular portion 16a side to the small-diameter-side annular portion 16b side of the retainer 16 are formed on the outer peripheral surface of each pillar portion 16c of the retainer 16, respectively. . The pair of ribs 16e are respectively arranged at positions slightly apart from both edges in the circumferential direction of the column part 16c, and are provided over the entire axial range of the column part 16c. The pair of ribs 16e are arranged so as to be inclined with respect to the rotation direction of the retainer 16 and opposite to each other with respect to the axial direction, and at the end on the small-diameter-side annular portion 16b side. They are connected to each other and formed in a substantially V shape when viewed in the radial direction. That is, the circumferential interval between the pair of ribs 16e gradually decreases from the large-diameter side annular portion 16a side toward the small-diameter side annular portion 16b side. Further, the pair of ribs 16e are continuously formed up to the outer peripheral surface of the large-diameter side annular portion 16a. Further, the pair of ribs 16e are formed such that their height (radial height) is constant in the axial direction.

  The double row outer ring 12 may use two single row outer rings. The outer ring spacer 17 may not be provided by increasing the width of the outer rings 11 and 12. Further, the material of the tapered roller bearing 10 is not limited as long as it can be quenched, such as bearing steel and carburized steel. The double-row inner rings 13 and 14, the outer ring 11 and the double-row outer ring 12, and the tapered rollers 15 are cut into dimensions that include margins in the finished dimensions by turning the materials, and then the materials are hardened by heat treatment. It is advisable to provide the required strength for the bearing and then finish to the final dimensions by grinding. Further, the cage 16 has a plurality of pockets 16d formed in the circumferential direction after deep drawing of the hot-rolled steel sheet. Further, the tapered roller bearing 10 is lubricated with a lubricant such as grease filled in a predetermined amount in the bearing inner space.

  In the roll neck tapered roller bearing 10 configured as described above, as shown in FIG. 2, when the cage 16 rotates in the forward direction (see arrow A), the pump effect is achieved in each of the double-row inner rings 13 and 14. The rib 16e (upper side in FIG. 2) of the pair of ribs 16e comes into contact with the lubricant that has flowed out from the small flange portions 13c, 13d, 14c, and 14d to the large flange portion 21 side. Lubricant is returned from the large collar part 21 side to the small collar parts 13c, 13d, 14c, and 14d side by the rib 16e (see arrow B).

  Further, as shown in FIG. 3, when the cage 16 rotates in the reverse direction (see arrow C), the double row inner rings 13 and 14 are respectively viewed from the side of the small flange portions 13c, 13d, 14c and 14d by the pump effect. Of the pair of ribs 16e, the rotation direction side rib 16e (the lower side in FIG. 3) comes into contact with the lubricant that has flowed out to the side of the large collar portion 21, and the lubricant is moved to the large collar portion 21 side by the rib 16e. Is returned to the side of the gavel 13c, 13d, 14c, 14d (see arrow D).

  As described above, according to the tapered roller bearing 10 for the roll neck of the present embodiment, the small-diameter-side annular ring is formed on the outer peripheral surface of the column portion 16c of the retainer 16 from the large-diameter-side annular portion side 16a of the retainer 16. Since ribs 16e extending toward the portion side 16b and extending obliquely with respect to the rotation direction of the cage 16 are provided, the pump effect causes the small flange portions 13c, 13d, 14c, and 14d to flow out to the large flange portion 21 side. The lubricant can be returned from the large collar portion 21 side to the small collar portions 13c, 13d, 14c, and 14d side, and the lubricant can be circulated inside the bearing. Thereby, since the lubrication state inside a bearing can be kept favorable, the lifetime improvement of the tapered roller bearing 10 can be achieved.

  Moreover, according to the tapered roller bearing 10 for roll neck of this embodiment, since the tapered roller bearing 10 is a four-row tapered roller bearing, it can be used suitably for the roll neck of a steel rolling mill, and the rolling operation is efficient. Can be done automatically.

  As a first modification of the present embodiment, as shown in FIG. 4, a pair of ribs 26 e may be formed on the outer peripheral surface of the column portion 16 c of the cage 16 instead of the pair of ribs 16 e. . The pair of ribs 26e are formed such that the height gradually decreases from the large diameter side annular portion 16a side toward the small diameter side annular portion 16b side. The pair of ribs 26e are not formed on the outer peripheral surface of the large-diameter side annular portion 16a.

  According to this modification, the height of the rib 26e gradually decreases from the large-diameter-side annular portion 16a side toward the small-diameter-side annular portion 16b, so that the raceway surfaces 11a, 12a of the outer rings 11, 12 and the cage The space between the 16 outer peripheral surfaces can be increased, and the retention of the lubricant inside the bearing can be enhanced.

  As a second modification of the present embodiment, as shown in FIG. 5, a pair of ribs 36 e may be formed on the outer peripheral surface of the column part 16 c of the retainer 16 instead of the pair of ribs 16 e. . The pair of ribs 36e is formed on the large-diameter-side annular portion 16a side of the column portion 16c, and more specifically, is formed on the axially half portion on the large-diameter-side annular portion 16a side of the column portion 16c. . The pair of ribs 36e are formed so that the height thereof is constant in the axial direction. Further, the pair of ribs 36e is not formed on the outer peripheral surface of the large-diameter side annular portion 16a.

  According to this modification, since the rib 36e is formed in the axially half part of the pillar portion 16c on the large-diameter annular portion 16a side, the raceway surfaces 11a and 12a of the outer rings 11 and 12 and the outer peripheral surface of the cage 16 The space between the two can be increased, and the retention of the lubricant inside the bearing can be enhanced.

  As a third modification of the present embodiment, as shown in FIG. 6, a pair of ribs 46 e may be formed on the outer peripheral surface of the column portion 16 c of the cage 16 instead of the pair of ribs 16 e. . The pair of ribs 46e are formed in the half in the axial direction on the large-diameter side annular portion 16a side of the column portion 16c, as in the second modification. The pair of ribs 46e are formed so that the height thereof gradually decreases from the large-diameter side annular portion 16a side toward the small-diameter side annular portion 16b side. Further, the pair of ribs 46e are not formed on the outer peripheral surface of the large-diameter side annular portion 16a.

  According to this modification, the rib 46e is formed in the axially half portion of the pillar portion 16c on the large diameter side annular portion 16a side, and the height of the rib 46e is smaller than the large diameter side annular portion 16a side. Since it gradually becomes lower toward the annular portion 16b side, the space between the raceway surfaces 11a, 12a of the outer rings 11, 12 and the outer peripheral surface of the cage 16 is further increased, and the retention of the lubricant inside the bearing is increased. Can be further increased.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the above-described embodiment, the tapered roller bearing 10 has been described as a four-row tapered roller bearing. However, the tapered roller bearing 10 is not limited to this. A row tapered roller bearing may be used, and the same effect is obtained.
Moreover, in the said embodiment, although the case where the tapered roller bearing 10 of this invention was applied to a steel mill was illustrated, it is not limited to this, The present invention is applied to various apparatuses used in a severe environment where a large amount of water is applied. The tapered roller bearing may be applied.

10 Tapered roller bearing for roll neck (tapered roller bearing)
11 outer ring 11a raceway surface 12 double row outer ring (outer ring)
12a Raceway 13 Double row inner ring (inner ring)
13a Raceway 14 Double row inner ring (inner ring)
14a Raceway surface 15 Tapered roller 16 Cage 16a Large-diameter side annular part 16b Small-diameter side annular part 16c Column part 16d Pocket 16e Rib 26e Rib 36e Rib 46e Rib

Claims (8)

A plurality of outer rings provided with a raceway surface on the inner peripheral surface, a plurality of inner rings provided with a raceway surface on the outer peripheral surface, and a plurality of cones disposed between the raceway surface of the outer ring and the raceway surface of the inner ring A plurality of rollers, and a plurality of retainers that hold the plurality of tapered rollers at substantially equal intervals in the circumferential direction,
The plurality of cages include a large-diameter side annular portion, a small-diameter-side annular portion disposed coaxially with the large-diameter-side annular portion, the large-diameter-side annular portion, and the small-diameter-side annular portion. And a plurality of column portions provided at substantially equal intervals in the circumferential direction, and a pocket formed between the column portions adjacent to each other in the circumferential direction so as to hold the tapered rollers in a rollable manner. , Each having a tapered roller bearing for a roll neck,
The outer circumferential surface of the pillar portion of the cage extends from the large-diameter-side annular portion side of the cage toward the small-diameter-side annular portion side and extends obliquely with respect to the rotation direction of the cage. A tapered roller bearing for a roll neck, characterized in that a rib is provided.   2. The tapered roller bearing for a roll neck according to claim 1, wherein the rib is provided on each of the pillar portions of the cage. 3. The ribs are provided as a pair on the pillar portion of the cage,
3. The roll neck tapered roller according to claim 1, wherein a circumferential interval between the pair of ribs gradually decreases from the large-diameter side annular portion side toward the small-diameter side annular portion side. bearing.   The tapered roller bearing for a roll neck according to any one of claims 1 to 3, wherein the rib is provided over the entire axial range of the outer peripheral surface of the column portion.   The tapered roller bearing for a roll neck according to any one of claims 1 to 3, wherein the rib is provided in a portion of the column portion on the large-diameter-side annular portion side.   The roll neck according to any one of claims 1 to 5, wherein a height of the rib gradually decreases from the large-diameter-side annular portion side toward the small-diameter-side annular portion side. Tapered roller bearings.   The tapered roller bearing for a roll neck according to any one of claims 1 to 6, wherein the tapered roller bearing is a four-row tapered roller bearing.   The tapered roller bearing for roll neck according to any one of claims 1 to 7, wherein the tapered roller bearing is mounted on a roll neck of a steel rolling mill.

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