JPH0137203B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating shaft bearing device including a radial bearing and a thrust bearing, and particularly to a rotating shaft bearing device suitable for use as a roll bearing device in a rolling mill.

Generally, a roll in a rolling mill is subject to a relatively large thrust load, so a bearing device for the roll is equipped with a thrust bearing as well as a radial bearing.

As a roll bearing device in a conventional rolling mill, there is one shown in FIG. In FIG. 1, a roll 1 is mounted on a shaft between a pair of roll housings 2, and both ends of the roll 1 are supported by bearing devices 3.
It is rotatably supported on the roll housing 2 via. This bearing device 3 includes a radial bearing 4, a thrust bearing 5, and a metal chock 6 housing these bearings 4 and 5. Both the radial bearing 4 and the thrust bearing 5 are
The outer periphery of the neck part 1A of the roll 1 and the metal choke 6
It is inserted between the inner circumference of the

However, in this conventional roll bearing device, since the thrust bearing 5 is inserted between the outer periphery of the neck portion 1A and the metal chock 6, the vertical dimension of the metal chock 6 is larger than that of the rolls adjacent to each other above and below. As a result, the outer diameter of the thrust bearing 5 is limited to within the outer diameter of the roll 1, and cannot sufficiently support the relatively large thrust load that may occur on the roll. There are some drawbacks such as not having one. Further, rolling mill rolls are often replaced, but in the case of conventional roll bearing devices, after the radial bearing 4 and thrust bearing 5 are assembled into the metal chock 6 and inserted into the roll 1, the bearing presser 7 is inserted into the roll 1. Since the roll 1 is assembled to the roll housing 2 by attaching the nut 8 to the roll 1, there is a drawback that it takes time to replace the roll 1.

Incidentally, as a special example of a bearing device for a rolling mill roll, there is a bearing device for a work roll of a Sendzima mill, as shown in FIGS. 2 and 3.

In this bearing device, a pair of work rolls 9
The thrust load can be received by the thrust bearing 10 inserted between the shaft end surface of the work roll 9 and the roll housing 2. Therefore, this thrust bearing 10 is limited to the outer diameter dimension of the work roll 9. Therefore, it is possible to design it so that it can receive a relatively large thrust load.

However, since this bearing device does not include a radial bearing, a roll bender cannot be provided. Furthermore, since the thrust bearing is fixed to the roll housing, it has the disadvantage that it cannot move up and down together with the roll.

An object of the present invention is to provide a bearing for a rotating shaft that can receive a relatively large thrust load, that allows the rotating shaft such as a roll to easily replace the bearing, and that can be equipped with a roll bender or the like as required. We are here to provide you with the equipment.

The present invention provides a bearing device for a rotating shaft such as a rolling mill roll, in which a radial bearing and a thrust bearing are provided in a metal chock so that the radial bearing can also move relative to the rotating shaft in the axial direction.
A thrust bearing is supported at a position outside the end surface of the rotating shaft so as to be rotatable around an axis perpendicular to the rotating shaft, and the outer periphery of the thrust bearing is brought into contact with the end surface of the rotating shaft to receive a thrust load.

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

4 and 5 show an embodiment in which the present invention is applied as a roll bearing device in a rolling mill, in which a pair of rolls 1 are respectively installed between a pair of roll housings 2. Both ends of both rolls 1 are rotatably supported by a roll housing 2 via a bearing device 13 according to the present invention.

This bearing device 13 includes a radial bearing 14, a thrust bearing 15, and a metal chock 16 that accommodates these. has been done. The metal chock 16 on one side is prevented from coming off by a keeper plate 17, and the metal chock 16 on the other side is prevented from coming off by a protrusion 18 of the roll housing 2, so that the fitted state is maintained.

The radial bearing 14 has an inner race 14A.
, an outer race 14B, and a plurality of rollers 14C rotatably interposed between both races, and the inner race 14A is connected to the neck portion 1 of the roll 1.
A and is prevented from coming off by a bearing retainer 19 fitted externally to the shaft end of the neck portion 1A. Outer lace 14B is metal choke 2
and is prevented from coming off by a bearing retainer 20 attached to the chock 2 together with the roller 14C. Inner race 14A and roller 14
The contact relationship with C is such that it can move relatively in the axial direction of the roll 1.

The thrust bearing 15 has an inner race 15A.
and an outer race 15B, and a plurality of rollers 15C rotatably interposed between both races,
It is supported via a pin 21 in a storage chamber 16A formed in a metal chop 16 on the outside of the end surface of the neck portion 1A of the roll 1. The pin 21 is mounted on the chock 16 so as to be perpendicular to the axial direction on the extension of the axis of the roll 1. The inner race 15A is fixed to this pin 21, and the outer periphery of the outer race 15B rotatably mounted on the inner race 15A via rollers 15C is in contact with the shaft end surface of the neck portion 1A of the roll 1. The contact between the outer race 15B and the end face of the neck portion 1A is made at a position spaced apart from the axis of the roll 1 at a protrusion 15D formed on the outer periphery of the outer race 15B. Therefore, as the outer race 15B rotates around the outer periphery of the end surface of the roll 1, it rotates around the pin 21, which is an axis perpendicular to the axial direction of the roll 1, at a peripheral speed equal to the peripheral speed of the end face of the roll 1. Therefore, since no sliding occurs at the contact surface between the end surface of the roll 1 and the protrusion 15D of the outer race 15B, almost no wear occurs.

In this way, each of the pair of rolls 1 transfers the load in the radial direction to the radial bearing 14 within the pair of metal jocks 16 at both ends thereof.
The loads in the thrust direction are individually supported by the thrust bearings 15. In this case, since the thrust bearing 15 is supported on the outer side of the end surface of the roll 1, it is not restricted by the outer diameter dimension of the roll 1.
It can be made sufficiently large if necessary, so that relatively large thrust loads, which can occur on rolling mill rolls, can be adequately coped with. By the way, the reaction force of the thrust load is the outer race 15B, roller 15C, inner race 15A, pin 21, metal choke 1.
6. Required for the roll housing 2 via the keeper plate 17 or the protrusion 18.

When replacing the roll 1 supported in this manner or each bearing, etc., when the keeper plate 18 is removed, one metal chock 16 can be pulled out from the roll housing 2. At this time, the thrust bearing 15 is located outside the end surface of the roll 1, and the radial bearing 14 is allowed to move in the axial direction at the contact surface between the inner race 14A and the rollers 14C. It can also be pulled out. Therefore, the metal chock 16 is pulled out from the roll 1 and the housing 2 in the uniaxial direction of the roll 1. One metal chock 1
6, the other metal chock 16 supporting the other end of the roll 1 also has a thrust bearing 1.
5 are located outside both ends of the roll 1, and the radial bearing 14 is allowed to move in the axial direction at the contact surface between the inner race 14A and the rollers 14C, so the roll 1 can be pulled out from the metal chock 16. become a state. Therefore, the roll 1 is pulled out in the uniaxial direction and a desired replacement operation is performed.

When all desired replacement work and repair inspections are completed, the roll 1 can be bridged to the roll housing 2 and both ends thereof can be rotatably supported by the bearing device 13 in the reverse manner to the above. In this way, the work of replacing the rolls and each bearing can be performed extremely easily and smoothly without being hindered by the thrust bearings.

According to this embodiment, since rolling bearings are used for both the radial bearing and the thrust bearing, wear and rotational resistance are extremely small. In addition, since the contact surface between the outer periphery of the thrust bearing and the end face of the roll is set at the farthest position from the roll axis, the thrust bearing rotates as the roll rotates without slipping, reducing wear. Can be suppressed. Furthermore, since only one metal choke is held by the keeper plate, the holding structure for the other metal choke can be simplified.

Note that both ends of each of the pair of rolls are supported separately by radial bearings and thrust bearings in the metal chokes, so the roll bender can be attached to each metal choke.
Can be easily installed.

Further, in the above embodiments, the present invention is applied to a bearing device for a roll of a rolling mill, but the present invention is not limited to this, but can also be applied to a bearing device for other rotating shafts. It exhibits an excellent effect in bearing devices for rotating shafts where friction may occur.

As explained above, according to the present invention, the area around the rotating shaft bearing can be greatly simplified, the rotating shaft and the bearing can be easily attached and removed, and the size of the thrust bearing is almost limited to the outer diameter of the roll. Because it is not
It can receive a relatively large thrust load, and furthermore, a roll bender can be easily installed as required.

[Brief explanation of drawings]

Figure 1 is a plan sectional view of the conventional example, Figures 2 and 3.
The figure is a front sectional view showing a bearing device for a work roll in a Senzima mill, a partially omitted side view taken along the line in Fig. 2, and Figs. 4 and 5 are partially omitted plan sectional views showing an embodiment of the present invention. and Figure 4-
It is a front sectional view along a line. 1...Roll, 2...Roll housing, 13
... Bearing device, 14 ... Radial bearing, 15 ...
Thrust bearing, 16...metal choke.

Claims (1)

[Scope of Claims] 1 A metal chock is provided with a radial bearing that receives a load in the radial direction of the rotating shaft and a thrust bearing that receives a load in the thrust direction of the rotating shaft, so as to rotatably support the end of the rotating shaft. In the bearing device for a rotating shaft, the contact surface of the radial bearing where rotational movement is performed in the circumferential direction between the metal chock and the rotating shaft is also allowed to move in the axial direction of the rotating shaft, and the thrust bearing is connected to the metal chock. The thrust bearing is provided at a position outside the shaft end of the rotating shaft and is rotatably supported around an axis perpendicular to the axial direction of the rotating shaft, so that the outer circumferential surface of the thrust bearing is in contact with the shaft end surface of the rotating shaft. A bearing device for a rotating shaft. 2. The rotating shaft bearing device according to claim 1, wherein the position where the thrust bearing and the end surface of the rotating shaft come into contact is set at a position separated from the axial center position of the rotating shaft.