JPH0589943U - Leveler backup rolling bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the generation of edge load and high surface pressure at the contact area between the outer ring 1 and the drive roll. [Structure] The outer diameter surface of the outer ring 1 is provided with a flat surface 1a at a central portion along a generatrix X and three stages of crowning 1b, 1c, 1d for connecting the flat surface 1a and both end surfaces of the outer ring 1 continuously. Has been. The curvature radius Rb of the first-stage crowning 1b is larger than the curvature radius Rc of the second-stage crowning, and Rc is larger than the curvature radius Rd of the third-stage crowning.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a rolling bearing that backs up a drive roll in a straightening leveler such as a steel plate.

[0002]

[Prior Art]

 The leveler straightens the coiled plate material into a smooth state, or the Luda line in the drawing process (a plate after cold working is drawn into a plate after being annealed without adding a skin pass. A line appears, which is called the Ryuda line.) It is used when cold working is applied to the plate material in advance in order to prevent it from occurring. As an example, FIG. 4 shows a leveler of a type in which a large amount of cold working is performed by the bending roll A and then straightening is performed by the straightening roll F. The rolls are arranged so as to stagger each other in the upper and lower numbers, and the guide roll C, the drive roll E, and the straightening roll F are arranged in this order from the entrance side. The degree of discrepancy between rolls is greater on the entrance side than on the exit side. When the plate material B is bitten by the driving roll E, the bending roll A is lifted. The plate material B is largely bent by several rolls on the entrance side, and its surface is subjected to large cold working. Then, the driving roll E sends it to the straightening roll F for straightening.

By the way, in general, the roll diameter of the leveler is properly used depending on the plate thickness of the plate material. A large diameter roll is used for a thick plate, and a small diameter roll is used for a thin plate. When using a roll having a small diameter, the rolling roll D for backup is used to reinforce the drive roll E. In the rolling bearing for backup, the outer ring itself has a roll shape (see Fig. 1) and directly contacts the outer peripheral surface of the drive roll to back it up.

As shown in FIG. 5, conventionally, cut surfaces 11b are provided at both end portions of the outer diameter surface of the outer ring 11 so that edge load does not occur at the contact portion between the outer ring 11 and the drive roll E (see FIG. a), the entire outer diameter surface is provided with a curvature (crowning) (FIG. 7B).

[0005]

[Problems to be solved by the device]

 In the structure shown in FIG. 5a, an edge remains at the boundary portion 12 between the flat surface 11a and the cut surface 11b, so that edge load may occur at this portion as well. The edge load increases as the cutting amount increases. On the other hand, in the structure shown in FIG. 5b, edge loading is unlikely to occur, but the contact area with the drive roll E is small, so it is considered that high surface pressure is generated at the contact portion. Edge load and high surface pressure may cause local wear and scratches on the drive roll.

Therefore, an object of the present invention is to prevent the occurrence of edge load and high surface pressure at the contact portion between the bearing outer ring and the drive roll.

[0007]

[Means for Solving the Problems]

 According to the present invention, a flat surface along the generatrix is provided in the central portion of the outer diameter surface of the outer ring, and the flat surface and both end surfaces of the outer ring are made continuous by a plurality of steps of crowning, and the first surface is formed continuously with the flat surface. From the step crowning to the final step crowning that is continuous to the end face, the radius of curvature was gradually reduced.

In addition, a flat surface is provided along the generatrix in the central portion of the outer peripheral surface of the outer ring, and the flat surface and both end surfaces of the outer ring are made continuous by a plurality of cut surfaces, and the flat surface is made continuous. From the first-stage cut surface to the end-stage continuous cut surface, the clearance angle with respect to the bus bar was gradually increased.

Further, in the above structure, the hardness of the outer ring is HRC 64 or less.

[0010]

[Action]

 By providing a plurality of stages of crowning or cutting surfaces, the boundary between the flat surface and the crowning or cutting surface and the boundary between the crowning or cutting surfaces can be made gentle, and both ends of the outer ring can be smoothed. By increasing the drop amount along the surface, a large drop amount can be secured as a whole.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

The embodiment shown in FIG. 1 is an application of the present invention to a backup double-row tapered roller bearing. This bearing includes an outer ring 1, a pair of inner rings 2, a plurality of rollers 3 interposed between the inner and outer rings 1, 2, a cage 4 that holds the rollers 3 at equal intervals around the circumference, and a seal member 5 that seals the inside of the bearing. And an inner ring spacer 6 interposed between the inner rings 2. The outer diameter surface of the outer ring 1 contacts the outer peripheral surface of the drive roll 7 of the leveler to back up the drive roll 7.

As shown in an exaggerated manner in FIG. 2, on the outer diameter surface of the outer ring 1, a flat surface 1 a in the central portion along the generatrix X and the flat surface 1 a and both end surfaces of the outer ring 1 are continuously connected to each other. Staged crownings 1b, 1c, 1d are provided. The radius of curvature Rb of the first-stage crowning 1b is larger than the radius of curvature Rc of the second-stage crowning, and Rc is larger than the radius of curvature Rd of the third-stage crowning. In this way, by making the flat surface 1a and the both end surfaces continuous by a plurality of stages of crowning, the boundary portion between the flat surface 1a and the crowning portion and the boundary portion between the crowning portions can be made gentle. In addition, a large crowning amount can be secured as a whole by reaching the both end surfaces of the outer ring 1 and reducing the radius of curvature of the crowning. Therefore, edge load is less likely to occur at the contact portion between the outer diameter surface of the outer ring 1 and the outer peripheral surface of the drive roller 7. Further, since the load can be supported by the flat surface 1a, a high surface pressure is less likely to be generated at the contact portion as compared with the one shown in FIG. 5b. Further, by appropriately setting the curvature of the crowning, for example, the normal load is handled by the flat surface 1a, and the large load or the moment load is handled by the first and second stages of the crowning 1b, 1c. It is possible. As a result, the ability to cope with load variations can be improved, and the occurrence of high surface pressure can be prevented more reliably.

In the embodiment shown in FIG. 3, the flat surface 1a and the both end surfaces of the outer ring 1 are continuously formed by three-step cut surfaces 1'b, 1'c, 1'd. The clearance angle θb of the first cut surface 1′b with respect to the generatrix X is smaller than the clearance angle θc of the second cut surface 1′c, and θc is the clearance angle of the third cut surface 1′d. It is smaller than θd. In this way, by making the flat surface 1a and the both end surfaces continuous by a plurality of cut surfaces, the same effect as that shown in FIG. 2 can be obtained.

Further, the same effect can be obtained even if the flat surface 1a and both end surfaces are made continuous by a combination of a plurality of stages of crowning and cut surfaces.

In the embodiment described above, if the hardness of the outer ring 1 is set to HRC 64 or less, preferably about HRC 53 to 58, a further effect can be expected in preventing wear and damage of the drive roll 7. That is, the hardness of the drive roll 7 is generally set to about HRC65 to 75, and when the hardness of the outer ring 1 is set to HRC64 or less, the hardness of the outer ring 1 becomes lower than the hardness of the drive roll 7, so that This is because the surface pressure acting on the contact portion is absorbed by the elastic deformation of the outer ring 1 side and high surface pressure is avoided.

Although a tapered roller bearing is illustrated in FIG. 1, the present invention can be similarly applied to a cylindrical roller bearing and the like.

[0018]

[Effect of the device]

 As described above, according to the present invention, a flat surface along the generatrix is provided on the outer diameter surface of the outer ring, and the flat surface and both end surfaces are made continuous by a plurality of steps of crowning or cutting surfaces. Edge load and high surface pressure are less likely to occur at the contact area between the outer ring and the drive roll. Therefore, the outer peripheral surface of the drive roll is less likely to be worn or damaged, and the life of the drive roll and the product quality can be improved.

Further, by making the hardness of the outer ring lower than the hardness of the drive roll, it becomes possible to more markedly exhibit the above effects.

[Brief description of drawings]

FIG. 1 is a sectional view showing a tapered roller bearing according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an outer diameter surface of an outer ring.

FIG. 3 is a cross-sectional view showing an outer diameter surface of an outer ring according to another embodiment of the present invention.

FIG. 4 is a diagram showing a leveler.

FIG. 5 is a diagram (FIGS. A and b) showing an outer diameter surface of a conventional bearing.

[Explanation of symbols]

 1 Outer ring 1a Flat surface 1b First stage crowning 1c Second stage crowning 1d Third stage crowning Rb Curvature radius Rc Curvature radius Rd Curvature radius 1'b First stage cut surface 1'c Second stage cut surface 1'd Third cut surface θb Relief angle θc Relief angle θd Relief angle X Generatrix of outer surface of outer ring 7 Drive roll

Claims (3)

[Scope of utility model registration request] 1. A drive roll is backed up by bringing an outer ring into contact with the outer peripheral surface of the drive roll of the leveler,
A flat surface along the generatrix is provided in the central portion of the outer diameter surface of the outer ring, and the flat surface and both end surfaces of the outer ring are made continuous by a plurality of steps of crowning, and the first step is continuous with the flat surface. Rolling bearing for backup of the leveler, characterized in that the radius of curvature is successively reduced from the crowning of the above to the final stage of the crowning continuous to the end face. 2. A drive roll is backed up by bringing an outer ring into contact with the outer peripheral surface of the drive roll of the leveler,
A flat surface along the generatrix is provided in the central portion of the outer peripheral surface of the outer ring, and the flat surface and both end surfaces of the outer ring are connected by a plurality of cut surfaces, and the first step is continuous with the flat surface. The leveling backup bearing is characterized in that the clearance angle with respect to the bus bar is gradually increased from the cut surface to the final cut surface continuous with the end surface. 3. The leveling backup rolling bearing according to claim 1, wherein the outer ring has a hardness of HRC 64 or less.