JPH0682437U - Multi-row roller bearing - Google Patents

Abstract

(57) [Summary] [Purpose] A seal for bearings for rolling mills, which is designed so as not to be damaged by roll removal and reassembly during roll repolishing, and is integrated with the bearing components. Is to provide a seal configuration that is [Configuration] A multi-row bearing that supports a work roll or a backup roll of a rolling mill. A seal case fits in the annulus between the inner and outer races. The seal case is shaped so as to fit completely inside the annular portion. The seal case includes an elastomeric portion that cooperates with the inner race to form a barrier at both ends of the bearing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing. More specifically, the present invention is a new multi-row bearing containing tapered rollers.

[0002]

[Prior art]

 Huge amounts of water are often used for cooling during the operation of rolling mills such as those used in the steel industry. Due to the enormous forces involved in rolling mill operation, roller bearings are lubricated with ordinary oil type lubricants. In order to operate at maximum efficiency, it is essential that the roller bearings are free of water and other foreign matter.

Positioning of seals and seals is very important to keep contaminants out of bearings in rolling mills. One seal arrangement that protects the normal roll neck bearing arrangement is far from the bearing and is often not scratched when the roll is removed for regrinding and then put back in place. As often as it relates to work rolls. An example of a conventional roll neck bearing configuration in which the seal is far away from the bearing is U.S. Pat. No. 3,512, issued to AJ Petros on May 19, 1970. No. 853, "Water for Rolling Mills and Lubricating Oil Seal Means".

In other conventional roll neck bearing configurations, the seal that protects the bearing from contaminants is housed in an end ring that is separate from the outer race of the bearing. An example of such a construction is U.S. Pat. No. 4,235,485 issued to Gerhard Reiter on November 25, 1980, "Unitized multi-row tapered roller bearings" and Aoki Akio et al. U.S. Pat. No. 4,422,698 "Bearing Assembly", issued Dec. 27, 1983.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a seal structure for a rolling mill bearing that is not damaged by roll removal and reassembly during roll repolishing. To provide a seal arrangement that is integral with the components of FIG.

[0006]

[Means for Solving the Problems]

 Briefly, the novel multi-row bearing has an inner race means having a pair of intermediate raceways and a pair of end raceways and a pair of intermediate raceways and end raceways of the inner race means surrounding the intermediate raceway of the inner race means. An outer race means having a pair of end tracks surrounding the outer race means, each track on the outer race means surrounding and corresponding to a different track on the inner race means. The rollers are arranged in rows between the corresponding races of the inner race means and the outer race means, and there are different rows of rollers between the corresponding intermediate races and end races of each set. An end seal is fitted within the annulus between the inner and outer race means adjacent each end of the annulus. The end seal is shaped to fit completely within the annulus. Each end seal has an elastomeric portion that operates in cooperation with the inner race means to form a barrier at both ends of the bearing.

The inner race means may comprise a pair of inner races, each inner race being a bearing having one intermediate track and one end track. The inner end surfaces of the inner race may be directly butt-bonded to each other, or alternatively spacers may separate the inner race. Means are provided for sealing the contacting inner end surfaces of the inner race when the inner end surfaces of the inner race contact each other. If the inner race is separated by spacers, means are provided to seal the spacers.

[0008]

【Example】

 Referring to the drawings and more particularly to FIG. 1, there is shown a multi-row tapered roller bearing particularly suitable for positioning and supporting the work rolls or support rolls 12 of a rolling mill. Each roll 12 of the rolling mill has a roll neck 14 at its end, which are reduced diameter end portions, each roll neck 14 being received in a bearing. The bearing is clamped and firmly held in the chinock 16 which is fixed to the frame of the compressor. The chinock 16 contains a conventional holding device and is further provided with a conventional O-ring seal 18 and seal 19. Therefore, the present bearing allows the roll 12 to rotate within the chinock 16.

The bearing comprises inner race means having a pair of inner races 20 and 22. The holes in the inner races 20 and 22 have the same diameter, and the diameter of the holes is about the same as the roll neck 14, so the roll neck 14 fits through the holes in the inner races 20 and 22. Preferably, the holes in the inner race are slightly larger in diameter than the diameter of the roll neck 14 for a loose fit to facilitate bearing removal. The inner races 20 and 22 have laterally extending end faces 24 and 26, respectively, cut off at right angles and between the two end faces 24 and 26 four inclined tracks 28, 30, 32 and 34. Is provided. Inner races 20 and 22 provide the bearings with intermediate raceways 30 and 32 and end raceways 28 and 34, respectively. The two intermediate tracks 30 and 32 are separated by an annular spacer 36.

The end raceway 28 and the intermediate raceway 30 of the inner race 20 are separated by an intervening cylindrical surface 38 that follows the larger diameter ends of the raceways 28 and 30. The intermediate raceway 32 and the end raceway 34 on the inner race 22 are separated by an intervening cylindrical surface 40 which follows the larger diameter ends of the raceways 32 and 34. The tracks 28 and 30 taper radially inward from the cylindrical intervening surface 38. The tracks 32 and 34 taper radially inward from the cylindrical intervening surface 40. Inner races 20 and 22 are surrounded by outer race means including divided outer races 42, 44 and 46. The outer race 42 is axially separated from the outer race 44 by an annular spacer 48. The outer race 44 is axially separated from the outer race 46 by an annular spacer 50.

The outer race 44 has raceways 52 and 54 which provide the bearing with intermediate raceways opposite the corresponding intermediate raceways 30 and 32 on the inner races 20 and 22, respectively. The two intermediate raceways 52 and 54 in the outer race 44 are separated by a cylindrical intervening surface 56 which follows the smaller diameter ends of the raceways 52 and 54. Tracks 52 and 54 taper radially outwardly from an intervening cylindrical surface 56.

The end race 58 on the outer race 42 tapers radially outward from the outer end of the outer race 42 and surrounds and is mounted face-to-face with the corresponding end race 28 on the inner race 20. There is. The end race 60 of the outer race 46 tapers radially outward from the outer end of the outer race 46 and is mounted face-to-face with a corresponding end track 36 of the inner race 22.

There is one row of tapered rollers 62 between the corresponding end tracks 28 and 58, and similarly there is another row of tapered rollers 64 between the intermediate tracks 30 and 52, and the intermediate track 32. Between 54 and 54 there is yet another row of tapered rollers 66, and between the end tracks 34 and 60 there is another row of tapered rollers 68.

A suitable circumferential spacing between each individual roller in each of the four rows is maintained by a cage. The individual retainers 70 for any row of rollers are separated from each other and can be made of plastic or any other suitable material.

The two cages are intermediate cages corresponding to the intermediate races in the main bearing, and the other two cages are end cages corresponding to the end races in the main bearing.

With reference to FIGS. 1 and 2, it can be seen that the end seals are fitted in the annulus 72 between the inner race means and the outer race means adjacent the ends of the annulus. Each end seal includes a seal case 74 and an annular elastomeric portion 76. A separate garter spring 78 ensures that the elastomeric portion 76 contacts the outer diameter extension 80 of the inner race.

The axial outer surface 24 of the inner race 20 and the axial outer surface 82 of the outer race 42 extend along the same cross section through the axis of the bearing. The end seal is shaped to fit completely within the annulus 72. The seal case 74 is generally C-shaped with the vertical portion of the C generally along the same transverse plane as the outer surfaces 24 and 82 of the inner race 20 and outer race 42, respectively. The horizontal portion of the C-shaped seal case is a radially outer portion 83 extending generally in the axial direction and a radially inner portion 84 extending generally in the axial direction. The elastomeric portion 76 is attached to the axially extending portion 84.

The crossbars of each roller cage 70 are tilted, but the holes 86 at the edges of the small diameter crossbars are larger than the outer diameter of the adjacent portion of the inner race means. The axially extending portion 84 of the seal case extends into the bore 86 of the retainer 70. In the embodiment of FIG. 2, the seal case is securely retained in the counterbore formed on the inner surface of the outer race 42. The seal case is pressed into the deep counterbore by a press fit by inserting the end seals from the right to the left as seen in Fig. 2 in the deep counterbore.

In the embodiment of FIG. 3, the end seal is maintained in the annular portion 72 between the inner race means and the outer race means by a molded annular rubber bead 92 on the outer diameter of the elastomer 93 which covers the seal case 74. The rubber beads extend into an annular groove 94 on the inner surface of the outer race 42. The annular groove 94 is axially spaced from the end face 82. The end seal is inserted into the annular portion 72 by pressing the end seal into the annular portion 72 from right to left as viewed in FIG.

In the embodiment of FIG. 4, the metal portion of the end seal is covered with rubber to ensure a positive seal. Mechanical retention is provided by bending the outer portion of generally axially extending portion 83 into a groove 98 formed in outer race 42. In the embodiment of FIG. 5, the seal case has a rubber-coated radially outer portion 100 that is angled. A counterbore with a correspondingly sloped surface is formed on the inner surface of the outer race. The end seals are installed by inserting the annulus between the inner race means and the outer race means from left to right as viewed in FIG. The mounting orientation is such that the seal case can bend outwards inward and pass by by its own smaller surface 104 and pop past the shoulder 102 into the final position shown in FIG. To do.

In the embodiment of FIG. 6, the end seal case includes a radially extending portion 105 integral with portion 83 and a portion 106 axially spaced from shoulder 102 and extending parallel to portion 83. A plurality of circumferentially spaced tabs 108 (only one shown in FIG. 6) are pre-formed to form the retaining tabs. The seal case is rubber coated at 110. Pre-bending the ear lobe 108 outwards imparts a positive residual strain energy to the ear lobe so that the ear lobe bounces into the groove 98 as the retaining ear lobe passes through the shoulder 112. . The rubber coating 110 and the case are configured to provide a positive compressive force to push the retaining tabs into the outer race groove 98 while sealing the surfaces.

[0022]

[Effect of device]

 In the bearing of the present invention, the end seal is not attached to a separate ring and the end seal is not far from the bearing itself. Rather, the end seal is placed in the annulus between the inner and outer races. Since a separate ring is not required to house the end seals in the present invention, the bearing assembly of the present application is cheaper to manufacture and is shown in US Pat. Nos. 4,235,485 and 4,422,698. Performs the same with fewer parts than the bearing assembly as described. The bearing of the present invention also requires a separate end ring to support the end seal and bearing disclosed in patents such as US Pat. No. 3,512,853 where the seal is remote from the bearing. Much less longitudinal space is required than the longitudinal space required for the patented patents mentioned above, yet it is constructed to retain the same capabilities as the bearings disclosed in the above patents. The practical economic effect is great.

[Brief description of drawings]

1 is a partial cross-sectional view of a roll of a rolling mill, with the roll neck protruding into a chock on the frame of the rolling mill and supported within the chock by the multi-row bearing of the present invention. There is.

FIG. 2 is a partial sectional view showing an embodiment of one end seal of the present invention.

FIG. 3 is a partial cross-sectional view showing another embodiment of the end seal of the present invention.

FIG. 4 is a partial sectional view showing still another embodiment of the end seal of the present invention.

FIG. 5 is a partial cross-sectional view showing yet another embodiment of the end seal of the present invention.

FIG. 6 is a partial cross-sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 20 Inner Race 24, 82 Outer Surface 42 Outer Race 62 Roller 70 Cage 72 Ring Part 74 Seal Case 76 Elastomer 78 Spring 86 Hole

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[Procedure amendment]

[Submission date] December 28, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

1 is a partial cross-sectional view of a roll of a rolling mill, with the roll neck protruding into a chock on the frame of the rolling mill and supported within the chock by the multi-row bearing of the present invention. There is.

FIG. 2 is a partial sectional view showing an embodiment of one end seal of the present invention.

FIG. 3 is a partial cross-sectional view showing another embodiment of the end seal of the present invention.

FIG. 4 is a partial sectional view showing still another embodiment of the end seal of the present invention.

FIG. 5 is a partial cross-sectional view showing yet another embodiment of the end seal of the present invention.

FIG. 6 is a partial cross-sectional view showing still another embodiment of the present invention.

FIG. 7 is a partial cross-sectional view showing an embodiment of the sealing means when a spacer is used to separate the two inner races.

FIG. 8 is a partial cross-sectional view showing an embodiment of the sealing means when the inner end faces of the two inner races are butted and joined to each other.

FIG. 9 is a partial cross-sectional view showing another embodiment of the sealing means when the inner end faces of the two inner races are butted and joined to each other.

FIG. 10 is a partial cross-sectional view of yet another embodiment of the sealing means when the inner end surfaces of the two inner races are butt joined together.

FIG. 11 is a partial cross-sectional view of another embodiment of the sealing means when the two inner races are separated by a spacer.

FIG. 12 is a partial cross-sectional view of yet another embodiment when the inner end surfaces of the two inner races are butt joined together.

FIG. 13 is a partial cross-sectional view of another embodiment of the sealing means when the inner end surfaces of the two inner races are butted and joined together.

FIG. 14 is a partial cross-sectional view of another embodiment of the sealing means when the two inner races are separated by a spacer.

FIG. 15 is a partial cross-sectional view of another embodiment of the sealing means when the two inner races are separated by a spacer.

Claims (3)

[Scope of utility model registration request] 1. A four-row tapered roller bearing, wherein the rows of roller bearings at both ends have raceways which are tapered outward in the axial direction of the bearing and inward in the radial direction, and a pair of intermediate raceways are formed in the bearing. Taper inward radially inward in the direction of the axis of, the end faces of the inner and outer races at both ends being cut off at right angles and lying in the same plane perpendicular to the bearing axis In multi-axis roller bearings, each row of rollers is retained by a cage, and each end row of roller retainers has an outer end rim with a hole that is larger in diameter than the outer diameter of the adjacent portion of the inner race. The edges of the outer end rims are slightly inward of the plane of the end faces of each end track, and the end seals are in the annulus between the inner race means and the outer race means and adjoin each end of the annulus. And the end seal is fully seated in the annulus. Each of the end seals has a metal seal case of approximately C-shaped in cross section, and the C-shaped vertical portion is cut off at the outer end of the end race of the adjoining outer race means and at the right angle of the inner race means. Extending generally along the same transverse plane as the end face, the horizontal portion of the C-shaped metal seal case is generally axially extending and radially inwardly extending, and the shorter portion is generally axially extending and radially outwardly extending. The radially inner metal portion extends into a corresponding end roller retainer hole, and the radially outer portion is an inner surface of the outer race to rotate with the outer race. And each end seal is also attached to the generally axially extending inner metal portion to fit virtually completely into the corresponding end roller retainer hole and form a barrier at both ends of the bearing. Joint with inner race means Has a portion of the dynamic to the elastomer, the portion of the elastomer has a groove of V-shaped radially outwardly, multi-row roller bearing garter spring to said grooves, characterized in that it is fitted. 2. A multi-row roller bearing according to claim 1, wherein each end seal is press-fitted into an annular portion between the inner race means and the outer race means. 3. The inner surface of the outer race means has a groove axially spaced from each of its opposite ends, and the axial retainer portion of each end seal is annular between the inner race means and the outer race means. 2. The multi-row roller bearing according to claim 1, wherein the multi-row roller bearing is fitted in a groove to hold an end seal on the portion.