JP3942286B2 - Thrust tapered roller bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thrust tapered roller bearing that is used at a center of fine swing of a crossing roll in a pair cross roll rolling mill that rolls steel sheets and the like, and is used at a location where the lubrication environment is not sufficient.
[0002]
[Prior art]
For example, in a multi-stage rolling mill for steel plates, by crossing the upper and lower work rolls and backup rolls in pairs, the width direction contact (surface pressure distribution) between the material to be rolled and the rolls is changed, and the cross section of the steel plate There is a pair cross mill that can control the shape.
[0003]
In a pair cross mill, a thrust tapered roller bearing with an increased number of rollers is used at the turning center of the upper and lower work rolls and the backup roll without using a cage suitable for low speed, swinging and high load.
[0004]
As shown in FIG. 5, in the thrust tapered roller bearing as described above, the raceway plate 1 having the groove 2 is provided on the lower side of the bearing as the fixed side, and the disc-like raceway plate 3 is provided on the upper side of the bearing as the movable side. Is provided. A tapered roller 4 is disposed between the raceway plate 1 and the disc-like raceway plate 3 so as to be loosely fitted in the groove 2. Further, the lower raceway plate 1 is formed with an attachment hole 5 for attaching to the fixed member and a suspension hole 6 for suspending the raceway plate 1. An attachment hole 7 for attachment to a rotating wheel (not shown) and a suspension hole 8 for suspending the raceway plate 3 are formed. As a result, the upper disk-shaped raceway plate 3 is attached to a rotating wheel (not shown) and rotated or oscillated, while the lower raceway plate 1 is stationary.
[0005]
Furthermore, the above-mentioned thrust tapered roller bearing may be heavy, and at the time of installation, the upper and lower race plates 1 and 3 are each configured to be set and combined separately in a housing of several tons, For the convenience of disposing the rollers, the raceway plate 1 having the groove 2 needs to be disposed below the bearing.
[0006]
[Problems to be solved by the invention]
However, in the above-described thrust tapered roller bearing, since the raceway plate 1 having the groove 2 is disposed on the lower side of the bearing, the bearing performs only slight oscillation without performing continuous rotation in one direction. When used in an oil bath without forced lubrication, in the conventional thrust tapered roller bearing described above, water droplets settle in the groove 2 of the lower raceway plate 1 and are caused by the water droplets. As a result, the raceway plate 1 and the tapered roller 4 may rust.
[0007]
Further, in order to remove such rust, it is conceivable that the raceway plate 1 having the groove 2 is subjected to rust removal processing (re-polishing). However, it may be difficult in practice, and the tapered roller 4 In some cases, the cone center is displaced and a problem such as slippage occurs between the raceway plate 1 and the tapered roller 4. Furthermore, in order to avoid slipping between the raceway plate 1 and the tapered roller 4, it may be possible to manufacture a new tapered roller 4, but this may increase the manufacturing cost.
[0008]
Furthermore, when installing the thrust tapered roller bearing, the upper and lower race plates 1 and 3 are not separately set in the housing, but can be set in the housing after the upper and lower race plates 1 and 3 are coupled by bolts, Accordingly, there is a desire to suppress the generation of rust by arranging the raceway plate 1 having the grooves 2 on the upper side of the bearing.
[0009]
The present invention was made in view of the circumstances as described above, and by disposing a raceway plate having a groove for loosely fitting a tapered roller on the upper side of the bearing, the generation of rust is suppressed, An object of the present invention is to provide a thrust tapered roller bearing capable of easily performing rust removal processing (re-polishing) even when rust is generated.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problem, a thrust tapered roller bearing according to the first aspect of the present invention includes:
In a pair cross roll rolling machine that crosses a pair of upper and lower work rolls and a backup roll and rolls a steel sheet, it is used at the swing center of the roll to be crossed, and has an upper track plate that has a groove and is disposed on the upper side , It consists of a disk-like lower raceway plate arranged on the lower side facing this, and the tapered roller is arranged between the upper raceway plate and the lower raceway plate so as to be loosely fitted in the groove. Thrust tapered roller bearing
The upper raceway plate and the lower raceway plate are each formed with a bolt hole and a screw hole that are vertically extended to face each other, and the bolt hole of the upper raceway plate is provided with an enlarged diameter portion that opens upward in the circumferential direction. The bolt has a bolt head accommodated in the enlarged diameter portion, and the bolt hole is inserted into the screw hole so as to be able to swing the upper race plate to the lower race plate. It is characterized by being connected to .
In order to solve the above-mentioned problem, the thrust tapered roller bearing according to the second aspect of the present invention is:
In a pair cross roll rolling machine that crosses a pair of upper and lower work rolls and a backup roll and rolls a steel sheet, it is used at the swing center of the roll to be crossed, and has an upper track plate that has a groove and is disposed on the upper side, It consists of a disk-shaped lower raceway plate arranged on the lower side facing this, and a tapered roller is placed between the upper raceway plate and the lower raceway plate so as to be loosely fitted in the groove. Thrust tapered roller bearing
The upper raceway plate and the lower raceway plate are respectively formed with a bolt hole and a screw hole extending vertically and facing each other. The bolt projects a bolt head from the upper raceway plate to form a bolt hole. The upper race plate is connected to the lower race plate by being removably screwed into the screw hole, and the thrust tapered roller bearing is used after the bolt is removed after being installed at a predetermined location of the rolling mill. It is characterized by that.
[0011]
Thus, according to the present invention, since the raceway plate having the groove is arranged on the upper side of the bearing, and the disk-like raceway plate is arranged on the lower side of the bearing, water droplets are not stored in the groove, Rust is hardly generated on the tapered roller and the raceway plate.
[0012]
Further, even if rust is generated, rust is hardly generated in the grooves and the tapered rollers, so that rust removal processing (re-polishing) can be easily performed.
[0013]
Furthermore, during installation of the thrust tapered roller bearings, the upper and lower track plates rather than set separately housing each, it is possible to set the housing after joining the upper and lower track plates by bolts or the like, a thrust upon assembly to the housing The tapered roller bearing can be easily moved, and the raceway plate having the groove can be disposed on the upper side of the bearing, so that the occurrence of rust can be suppressed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a thrust tapered roller bearing according to an embodiment of the present invention will be described with reference to the drawings.
[0015]
Fig.1 (a) is a top view of the thrust tapered roller bearing which concerns on embodiment of this invention, FIG.1 (b) is sectional drawing of the same thrust tapered roller bearing. FIG. 2 is an enlarged sectional view of the thrust tapered roller bearing shown in FIG. 3A and 3B are views showing the relationship between the long holes provided in the raceway plate and the bolts, respectively.
[0016]
In the thrust tapered roller bearing according to the present embodiment, as shown in FIG. 1, a raceway plate 11 having grooves 12 is provided on the upper side of the bearing as a movable side, and a disc-like raceway plate 13 is provided on the lower side of the bearing as a fixed side. On the side. The tapered roller 14 is disposed between the raceway plate 1 and the disc-like raceway plate 3 so as to be loosely fitted in the groove 12.
[0017]
Further, the upper race plate 11 is formed with an attachment hole 15 for attaching to a rotating wheel (not shown) and a suspension hole 16 for suspending the race plate 11. An attachment hole 17 for attaching to a fixed member (not shown) and a suspension hole 18 for suspending the raceway plate 13 are formed.
[0018]
Further, as shown in FIG. 3 in an enlarged manner, the upper race plate 11 is formed with a long bolt hole 21, and the diameter of the bolt hole 21 is increased as shown in FIG. An enlarged diameter portion 21a is formed. A screw hole 22 is also formed in the lower raceway plate 13 so as to correspond to the bolt hole 21.
[0019]
As shown in FIG. 2, a bolt 23 is inserted into a long bolt hole 21 of the track plate 11 and screwed into a screw hole 22 of the track plate 13. At this time, the bolt 23 is configured to have a sufficient gap in the long bolt hole 21, and the head of the bolt 23 is accommodated in the enlarged diameter portion 21 a, from the upper surface of the raceway plate 11. It is configured not to protrude.
[0020]
In assembling such a thrust tapered roller bearing, the upper race plate 11 and the lower race plate 13 are assembled while the tapered rollers 14 are loosely fitted in the grooves 12 of the upper race plate 11. The bolt 23 is inserted into the long bolt hole 21 of the track plate 11 and screwed into the screw hole 22 of the track plate 13. Thereby, the thrust tapered roller bearing as a unit is completed.
[0021]
In this embodiment, when the thrust tapered roller bearing is assembled in a housing of several tons, the upper and lower race plates 11 and 13 are assembled as a unit by the bolt 23 in advance, so that the race plate 11 having the groove 12 is arranged on the upper side of the bearing. Can be arranged.
[0022]
Further, when such a thrust tapered roller bearing is slightly swung, the bolt 23 is inserted into the long bolt hole 21 even if the upper and lower race plates 11 and 13 are connected by the bolt 23. Therefore, as shown in FIGS. 3A and 3B, when the upper track plate 11 swings, the bolt 23 can move in the long hole of the bolt hole 21, and the track plate 11 swings. Will not cause any problems. Therefore, it is not necessary to remove the bolt 23 during use.
[0023]
As described above, in this embodiment, the upper and lower race plates 11 and 13 are assembled in advance as a unit by the bolt 23 and the race plate 11 having the groove 12 is disposed on the upper side of the bearing. Is not stored, and rust is hardly generated on the tapered roller 14 and the raceway plates 11 and 13. Further, even if rust is generated, rust generated in the grooves 12 and the tapered rollers 14 is small, so that rust removal processing (re-polishing) can be easily performed. Furthermore, since the upper and lower race plates 11 and 13 are assembled in advance as a unit by the bolt 23, the thrust tapered roller bearing can be easily moved.
[0024]
Next, FIG. 4 shows a thrust tapered roller bearing according to another embodiment of the present invention.
[0025]
In this other embodiment, the bolt hole 21 of the upper race plate 11 is formed into a round hole, and the bolt 23 is inserted into the bolt hole 21 of this round hole, and screwed into the screw hole 22 of the race plate 13. Has been. Therefore, the head of the bolt 23 protrudes from the upper raceway plate 11.
[0026]
In this case, at the time of assembling the thrust tapered roller bearing, the bolt 23 is inserted into the round bolt hole 21 of the race plate 11 and screwed into the screw hole 22 of the race plate 13 so that the thrust tapered roller bearing as a unit is obtained. Finalize. Next, when a thrust tapered roller bearing is used in, for example, a steel plate multi-stage rolling mill, the bolt 23 is removed after the thrust tapered roller bearing is incorporated into the housing. Therefore, at the time of use, the head of the bolt 23 does not become an obstacle when the raceway plate 11 swings.
[0027]
In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.
[0028]
【The invention's effect】
As described above, according to the present invention, since the raceway plate having the groove is disposed on the upper side of the bearing and the disk-shaped raceway plate is disposed on the lower side of the bearing, water droplets can be stored in the groove. Therefore, it is possible to almost eliminate the occurrence of rust on the tapered roller and the raceway plate.
[0029]
Further, even if rust is generated, rust is hardly generated in the grooves and the tapered rollers, so that rust removal processing (re-polishing) can be easily performed.
[0030]
Furthermore, during installation of the thrust tapered roller bearings, the upper and lower track plates rather than set separately housing each, it is possible to set the housing after joining the upper and lower track plates by bolts or the like, a thrust upon assembly to the housing The tapered roller bearing can be easily moved, and the raceway plate having the groove can be disposed on the upper side of the bearing, so that the occurrence of rust can be suppressed.
[Brief description of the drawings]
FIG. 1 (a) is a plan view of a thrust tapered roller bearing according to an embodiment of the present invention, and FIG. 1 (b) is a cross-sectional view of the thrust tapered roller bearing.
FIG. 2 is an enlarged sectional view of the thrust tapered roller bearing shown in FIG. 1 (b).
FIGS. 3A and 3B are views showing a relationship between a long hole provided in a raceway plate and a bolt, respectively.
FIG. 4 is an enlarged sectional view of a thrust tapered roller bearing according to another embodiment of the present invention.
FIG. 5 is a sectional view of a conventional thrust tapered roller bearing.
[Explanation of symbols]
11 Track plate 12 Groove 13 Track plate 14 Tapered roller 15 Mounting hole 16 Lifting hole 17 Mounting hole 18 Lifting hole 21 Bolt hole 21a Expanded portion 22 Screw hole 23 Bolt

Claims (2)

In a pair cross roll rolling machine that crosses a pair of upper and lower work rolls and a backup roll and rolls a steel sheet, it is used at the swing center of the roll to be crossed, and has an upper track plate that has a groove and is disposed on the upper side , It consists of a disk-like lower raceway plate arranged on the lower side facing this, and the tapered roller is arranged between the upper raceway plate and the lower raceway plate so as to be loosely fitted in the groove. Thrust tapered roller bearing
The upper raceway plate and the lower raceway plate are each formed with a bolt hole and a screw hole that are vertically extended to face each other, and the bolt hole of the upper raceway plate is provided with an enlarged diameter portion that opens upward in the circumferential direction. The bolt has a bolt head accommodated in the enlarged diameter portion, and the bolt hole is inserted into the screw hole so as to be able to swing the upper race plate to the lower race plate. Thrust tapered roller bearings characterized by being coupled to . In a pair cross roll rolling machine that crosses a pair of upper and lower work rolls and a backup roll and rolls a steel sheet, it is used at the swing center of the roll to be crossed, and has an upper track plate that has a groove and is disposed on the upper side, It consists of a disk-shaped lower raceway plate arranged on the lower side facing this, and a tapered roller is placed between the upper raceway plate and the lower raceway plate so as to be loosely fitted in the groove. Thrust tapered roller bearing
The upper raceway plate and the lower raceway plate are respectively formed with a bolt hole and a screw hole that extend vertically to face each other, and the bolt projects a bolt head from the upper raceway plate to form a bolt hole. The upper race plate is connected to the lower race plate by being removably screwed into the screw hole, and the thrust tapered roller bearing is used after the bolt is removed after being installed at a predetermined location of the rolling mill. Thrust tapered roller bearing characterized by that.

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