JPS6344574Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a sealing device for a roll bearing, and more specifically, to a back-up roll for a wet-type leveler used in the straightening process of metal sheets such as steel plates. The present invention relates to a roll bearing sealing device suitable for reducing driving torque and improving sealing performance.

BACKGROUND TECHNOLOGY In a leveler used in the straightening process of a metal sheet, for example, a steel plate, in order to improve the cleanliness of the surface of the steel plate in the process of straightening and to increase the dimensional accuracy of the final product, the surface of the steel plate is constantly or intermittently heated. may be sprayed with cleaning solution. The back-up roll of a wet type leveler installed in a straightening process that involves the spraying of cleaning liquid must be able to simultaneously satisfy the conflicting demands of reducing drive torque and improving sealing performance against cleaning liquid. From this point of view, various types of sealing devices for roll bearings have been proposed. FIGS. 2 and 3 are partial vertical cross-sectional views illustrating a known sealing device for a roll bearing used in the above-mentioned backup roll for a wet type leveler. First, the back-up roll R shown in Fig. 2 is an oil seal 2 in which spring steel 1 is embedded with the intention of improving sealing performance.
However, when such a seal structure is adopted, the radial tightening torque due to the elastic deformability of the spring steel 1 is applied to the shaft body 3 and the roll body 4 of the back-up roll. In order to act,
The torque required to drive the backup roll increases. For this reason, the back-up roll does not rotate and slips, damaging the surface of a work roll (not shown) and, in the worst case, causing scratches on the surface of the steel plate being straightened. In addition, the Backup Prowl R shown in Figure 3 uses a springless oil seal 2' with a relatively small radial tightening torque in order to reduce the driving torque. In such cases, it is not easy to prevent the cleaning fluid from entering the bearing, and after a short period of use, the cleaning fluid may enter the bearing, causing problems such as deterioration of the grease, leakage, or rotation failure due to rusting. I was pushing him.

Problems to be Solved by the Invention The present invention aims to reduce the driving torque, which could not be achieved with a sealing device for a roll bearing, for example, a sealing device for a roll bearing for a known wet type leveler backup roll. The main object of the present invention is to provide a sealing device for a roll bearing having a multi-seal structure that can improve sealing performance at the same time.

Means for Solving the Problems The present invention provides a roll R rotatably supported on a shaft body 12 via first rolling bearings 11 attached to both ends of a roll body 10 having a hollow cylindrical shape.
, a second rolling bearing for thrust load loading is provided between the inner circumferential surface of the roll body and the shaft body 12 from the mounting portion of the first rolling bearing 11 toward the outer end surface of the roll body 10. 13 and the second
a seal collar 14 that is in close contact with the outer end surface of the outer ring 13' of the rolling bearing; an end face seal member 15 made of an elastic material that is fitted so as to form a sealing portion with respect to the outer end surface of the seal collar; body 1
2 and a cover member 16 fitted to form a labyrinth seal between the roll body 10 and the inner circumferential surface of the outer end portion of the roll body 10.

Embodiment FIG. 1 is a longitudinal sectional view of a sealing device for a roll bearing for a wet type leveler backup roll, illustrating the device of the present invention. As shown in the figure, a roll main body 10 having a hollow cylindrical shape is rotatably supported on a shaft body 12 via double row cylindrical roller bearings 11 attached to both ends thereof. In addition to the double-row cylindrical roller bearing, the first rolling bearing 11 may include a double-row spherical roller bearing, etc., in order to withstand the large radial load applied to the back-up roll R during straightening of a metal sheet such as a steel plate. may be used.

A stop ring 17 and an O-ring are provided between the inner circumferential surface of the roll body 10 and the shaft body 12 from the mounting portion of the first rolling bearing 11 toward the outer end surface of the roll body 10. A second rolling bearing for thrust load loading, for example, a deep groove ball bearing 13 with a built-in non-contact seal, is loosely fitted to the shaft body 12 via a shaft 18, and an outer end surface of an outer ring 13' of the deep groove ball bearing. a ring-shaped seal collar 14 that is in close contact with the seal collar; a rubber end face sealing member 15 with a spring steel 22 embedded therein fitted through a spacer 19 so as to form a sealing portion on the outer end face of the seal collar; The shaft body 12 and the roll body 1
A cover member 16 is sequentially disposed so as to form a labyrinth seal between the cover member 16 and the inner circumferential surface of the outer end of the cover member 1.

It is also possible to use a cylindrical roller bearing in place of a deep groove ball bearing as the second rolling bearing 13, and to apply the thrust load acting on the roll body 10 and the shaft body 12 at the end face of the cylindrical roller. In addition to functioning as a pressure receiving member for thrust loads, the built-in non-contact seal can also be used as a secondary sealing member for cleaning liquid.
It is preferable to selectively use deep groove ball bearings. Further, in order to reduce the driving torque of the back-up roll, the end face seal member 15 is attached to the roll main body 10 and the shaft body 12 when the tip thereof comes into close contact with the outer end face of the seal collar 14.
The spring steel 22 embedded in the spring steel 22 is formed in a side-pressing type so that a radial load due to the elastic deformability of the steel 22 does not act thereon. That is, the end seal member 1
The compressive load caused by the elastic deformability of the spring steel 22 embedded in the seal collar 14 presses the outer end surface of the seal collar 14 only from the side, thereby firmly sealing this part without generating a radial load. On the other hand, the cover member 16 has its inner diameter side fixed to the shaft body 12,
Further, on the outer diameter side, a relatively deep groove 20c extending in the radial direction is provided approximately at the center of the edge. The diameter of the outer edge 20a of the cover member 16 is larger than the diameter of the inner edge 20b, and the groove 2
The diameter of the bottom of 0c is designed to be smaller than the diameter of the inner edge 20b. Furthermore, a groove 21c is formed on the inner circumferential surface of the outer end of the roll body 10, facing the groove 20c. Therefore groove 21
The inner diameter 21a of the roll body 10 on the outside of the groove 21c is larger than the inner diameter 21b of the roll body 10 on the inside of the groove 21c, and the diameter of the bottom of the groove 21c is larger than the inner diameter 21a on the outside. It is designed to. These grooves 20c and 21
c is connected to the cover member 1 via the stop ring 23.
6 is fixed to the shaft body 12, it forms a labyrinth mechanism and exhibits a strong sealing function against cleaning liquid that attempts to enter the roll body 10 from the outside.

Effects of the Invention As can be understood from the above explanation, the present invention provides an end face sealing member which is attached to the end of the roll body of a back up roll for a roll bearing, for example, a wet type leveler, and whose tip is brought into close contact with the outer end face of the seal collar. By forming a multiple seal mechanism consisting of a cover member having a labyrinth structure and a cover member having a labyrinth structure,
To provide a sealing device for a roll bearing that has excellent durability and is free from the risk of cleaning water intruding into the inside of the roll.

The present invention effectively reduces drive torque by using the multiple sealing function of the seal member and cover member described above, and the additional sealing function of the non-contact seal of the second rolling bearing for thrust load loading. A strong sealing device is formed at the end of the roll body while reducing the Therefore, the present invention is highly effective in preventing the cleaning liquid from entering the roll bearings and reducing operating power, and can also greatly contribute to extending the life of the rolls.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a roll bearing sealing device for a wet type leveler backup roll, illustrating the device of the present invention. 2 and 3 are longitudinal sectional views of a roll bearing sealing device for a known wet type leveler backup roll. 10... Roll body, 11... First rolling bearing,
DESCRIPTION OF SYMBOLS 12... Shaft body, 13... Second rolling bearing, 14... Seal collar, 15... End seal member, 16... Cover member, R... Roll.

Claims (1)

[Scope of utility model registration request] In a roll that is rotatably supported on a shaft via first rolling bearings mounted on both ends of a hollow cylindrical roll main body, the outer end surface of the roll main body from the mounting part of the first rolling bearing A second rolling bearing for thrust load loading is provided between the inner circumferential surface of the roll body and the outer circumferential surface of the shaft body, and a seal that is in close contact with the outer end surface of the outer ring of the second rolling bearing. A labyrinth seal is provided between the collar, an end face sealing member made of an elastic material fitted to form a sealing portion on the outer end surface of the seal collar, and the shaft body and the inner peripheral surface of the outer end of the roll body. A sealing device for a roll bearing, comprising a cover member fitted to form a roll bearing.