JPH0549102U - Bearing device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a bearing device, surely achieve rust prevention of the retaining ring, prevention of disengagement, and prevention of accidents when the retaining ring is worn. [Structure] A cover portion 21a of a backup plate 21 interposed between a retaining ring 18 of a shaft 10 and a chock 19
Then, the outer circumference of the retaining ring 18 is covered. Cooling water or the like is not applied to the retaining ring 18, and the retaining ring 18 can be prevented from coming off. When the retaining ring 18 is worn, the axial load from the seal ring 15 is applied to the chock 19 via the backup plate 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to, for example, an improvement of a bearing device for a back up roll that suppresses a bending of a work roll of a rolling mill during rolling.

[0002]

[Prior Art]

 Conventionally, in the above-described backup roll bearing device, as shown in FIG. 3, a cylindrical roller 3 and a tapered roller bearing 4 are fitted between a roll shaft 1 and an outer cylinder 2. A seal cover 5 is fitted on the inner circumference of the end of the outer cylinder 2 and fixed axially by a first retaining ring 6, and a seal ring 7 is fitted on the outer circumference of the end of the roll shaft 1. It is fixed in the axial direction by a second retaining ring 8. A stringer 9 is fixed to the outer circumference of the seal ring 7, and the stringer 9 covers the space between the seal ring 7 and the seal cover 5.

[0003]

[Problems to be solved by the device]

 However, the snap ring 8 has a short life due to rust, corrosion and wear, and an accident due to the snap ring 8 may occur. For example, when the retaining ring 8 is worn, the outer cylinder 2 moves in the axial direction, and at the same time, water and scale enter the bearing portion and the entire roll unit is damaged.

Therefore, an object of the present invention is to provide a bearing device that can surely achieve rust prevention and disengagement prevention of a retaining ring, and prevention of accidental occurrence when the retaining ring is worn.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a bearing member fitted to a shaft, a ring fitted to the shaft and axially supporting the bearing member, and locked to the shaft. A cover for abutting the retaining ring, a chock facing the shaft end surface of the shaft, and the ring so as to be able to contact the ring and the chock in the axial direction and covering the outer circumference of the retaining ring. And a backup plate having a section.

[0006]

[Action]

 According to the bearing device of the present invention, by covering the outer periphery of the retaining ring with the cover portion of the backup plate interposed between the retaining ring of the shaft and the chock, the retaining ring is protected from cooling water. It can prevent rust and prevent the retaining ring from coming off. When the retaining ring is worn, the chock is loaded with the axial load from the ring via the backup plate. That is, by making the above-mentioned backup plate act as a backup ring for the axial load, axial movement of the bearing member can be prevented.

[0007]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to an embodiment of a bearing device for a backup roll of a rolling mill shown in the drawings. As shown in FIG. 1, cylindrical roller bearings 13 and 13 are fitted between the roll shaft 10 and the outer cylinder 11 on both sides of the inner flange portion 11a of the outer cylinder 11 and the inner ring spacer 12 of the roll shaft 10. Has been done. Each of the bearings 13 is composed of an inner ring 13a, an outer ring 13b, a core 13c, and a cage 13d.

On the outer end side of each bearing 13, an inner ring collar ring 14 and a seal ring 15 are fitted on the roll shaft 10 and an outer cylinder 11 A seal cover 16 is fitted to the seal cover 16, and the seal material 17 of the seal ring 15 is brought into contact with the seal cover 16 to seal the seal.

The seal ring 15 is fixed in the axial direction by bringing the outer end surface of the seal ring 15 into contact with the retaining ring 18 locked in the annular groove 10 a of the roll shaft 10.

Between the outer end surface of the seal ring 15 and the end surface of the chock 19 supporting the roll shaft 10, a metal (SUS) fitted to the end portion of the roll shaft 10 with a seal material 20 interposed therebetween is used. Etc.) backup plate 21 is interposed. The backup plate 21 is provided with a cover portion 21a that covers the outer circumference of the retaining ring 18. The thickness of the plate 21 is such that when the inner end surface of the cover portion 21a is in contact with the outer end surface of the seal ring 15 fixed by the retaining ring 18, the outer end surface of the backup plate 21 and the chocks 19 are not in contact with each other. Set so that there is a slight gap between them. Therefore, the backup plate 21 comes into contact with the seal ring 15 and the chock 19 in the axial direction by a slight movement of the seal ring 15 in the axial direction.

According to the above configuration, since the outer periphery of the retaining ring 18 is covered by the cover portion 21a of the backup plate 21, the retaining ring 18 is not exposed to cooling water or the like, so that rust prevention is possible. Further, the cover portion 21a of the backup plate 21 can prevent the retaining ring 18 from coming off in the radial direction.

By the way, when an axial load Fa acts on the outer cylinder 11, the load Fa is usually such that the outer cylinder 11 → the outer ring 13b → the rollers 13c → the inner ring collar ring 14 → the seal ring 15 → the retaining ring 18 → the roll shaft 10 → It is transmitted in the order of chock 19.

On the other hand, when the retaining ring 18 is worn, the load Fa is the same from the outer cylinder 11 → the outer ring 13b → the rollers 13c → the inner ring collar ring 14 → the seal ring 15, but after that, The backup plate 21 and the chock 19 are loaded in this order, and the retaining ring 18 and the roll shaft 10 are not loaded. In other words, the backup plate 21 serves as a backup ring when the retaining ring 18 is worn, so that the axial movement of the outer cylinder 11 is prevented. This prevents water and scale from entering the bearing and damaging the entire roll unit.

[0014]

[Effect of the device]

 As is clear from the above description, the bearing device of the present invention covers the outer periphery of the retaining ring with the cover portion of the backup plate interposed between the retaining ring of the shaft and the chock. . Therefore, since the retaining ring is not splashed with cooling water or the like, it is possible to prevent rust and prevent the retaining ring from coming off. Further, when the retaining ring is worn, the axial load from the ring fitted on the shaft is applied to the chock via the backup plate, so that the axial movement of the bearing member can be prevented and water, etc. can be prevented. It is also possible to prevent the accident of damage to the entire bearing device due to the intrusion of air.

[Brief description of drawings]

FIG. 1 is a sectional side view of a main part of a bearing device for a backup roll according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view of a main part of a conventional bearing device for backup rolls.

[Explanation of symbols]

10 ... Roll shaft, 11 ... Outer cylinder, 13 ... Cylindrical roller bearing, 1
4 ... Inner ring collar ring, 15 ... Seal ring, 18 ... Retaining ring, 1
9 ... Chock, 21 ... Backup plate, 21a ...
Cover part.

Claims (1)

[Scope of utility model registration request] 1. A bearing member fitted to a shaft, a ring fitted to the shaft and axially supporting the bearing member, a retaining ring locked to the shaft and abutting the ring, A backup plate is provided between the ring and the chock facing the shaft end face of the shaft, the ring and the chock being interposed so as to be able to come into axial contact with the chock, and having a cover portion that covers the outer periphery of the retaining ring. Bearing device characterized in that