JP2002213460A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device, capable of enhancing installing performance of the bearing device and capable of restraining damages to parts at installation time. SOLUTION: Since a cutout 121a and an inner peripheral chamfer part 121b, extending beyond the axial directional inside end of the cutout 121a are formed on an end surface of an inner race 121, even when inserting the inner race 121 into the shaft end 11, since interference between the cutout 121a and the shaft end 11 is restrained, the inner race can be inserted more smoothly into the shaft end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device used for, for example, steel facilities and rolling mills.

[0002]

2. Description of the Related Art A bearing device is provided to support a backup roll, a work roll, an intermediate roll and the like of a hot rolling mill or a cold rolling mill. Such a bearing device is formed, for example, by incorporating a roller and an outer ring into an inner ring fitted into a shaft end of a backup roll.

[0005] FIG. 5 is a view showing a mode in which an inner ring of a bearing device is attached to a shaft end of a backup roll as an example. The mounting mode will be described specifically.
As shown in FIG. 5A, in a state where two inner rings 21 are arranged in series, as shown in FIG.
It is pushed from the outside in the axial direction by a pressing device (not shown) toward the 0 axis end 11 and abuts against the roll fillet ring 12. Thereafter, the four rows of rollers 23 are arranged radially outward of the inner ring 21 and the outer ring 22 is further incorporated radially outward, whereby the bearing device 10 is formed at the shaft end 11 of the backup roll 10. ing.

[0004] By using the backup roll 10 for a long time, the inner ring 21 is worn. Therefore, it is necessary to replace the inner ring 21 when the wear exceeds the usage limit. Here, as shown in FIG. 6 which is a perspective view, the inner ring 21 is provided with four notches 21a at both end edges thereof at equal intervals in the circumferential direction. The notch 21a functions as an oil groove for supplying lubricating oil in order to suppress the occurrence of galling on the end surface of the inner ring 21 when the shaft end 11 and the inner ring 21 are loosely fitted. When removing the inner race 21, the notch 21a can be used.

FIG. 7 is a diagram showing a mode in which the inner ring is removed from the shaft end of the backup roll. First, FIG.
As shown in FIG. 7, the claw-shaped jig 30 is inserted into the notch 21a of the innermost ring 21 on the innermost side, and is pulled outward in the axial direction (to the left in FIG. 7A). Thereby, the inner ring 21 moves relatively to the shaft end 11 of the backup roll 10 (FIG. 7).
(B)) and finally separated from the shaft end 11 (FIG. 7 (c)). In addition, it may be pulled out from the inner ring 21 on the near side.

[0006]

Here, the bearing device of the prior art has a problem relating to assembly. This problem is caused by the shaft end 11 of the backup roll 10 and the inner race 21.
Will be described with reference to FIG. First,
When the inner race 21 is inserted with the axis inclined with respect to the axis of the shaft end 11 of the backup roll 10 from the state shown in FIG.
As shown in FIG. 8 (a), it comes into contact with the first chamfered portion 11 a and relatively slides on the boundary (B) between the chamfered portion 11 a and the outer peripheral surface 11 b of the shaft end 11.

However, since the boundary (B) is sharp, the boundary (B) is easily caught on the bottom of the notch 21a, thereby deteriorating the assembling property. Further, when the inner ring 21 is forcibly pushed into the shaft end 11, the inner peripheral surface 21b of the inner ring 21 is damaged due to the interference with the boundary (B), and the notch 21a in which burrs are generated due to the collision of the boundary (B). As a result, the outer peripheral surface of the shaft end 11 may be damaged.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a bearing device capable of improving the assemblability of the bearing device and suppressing damage to parts at the time of assembling. .

[0009]

In order to achieve the above object, a bearing device according to the present invention includes an outer ring, an inner ring, and a rolling element rotatably disposed between the outer ring and the inner ring.
The inner ring has a circular tubular shape, and a notch and an inner peripheral chamfer extending beyond an axially inner end of the notch are formed on an end face thereof.

[0010]

The bearing device of the present invention comprises an outer ring, an inner ring, and a rolling element rotatably disposed between the outer ring and the inner ring.
The inner ring is a tubular shape, and a cutout and an inner peripheral chamfer extending beyond the axially inner end of the cutout are formed on the end face, so that the inner race is Even when the inner ring is inserted, interference between the notch and the shaft end is suppressed, so that the inner ring can be more smoothly inserted into the shaft end.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an end of an inner race that constitutes the bearing device according to the present embodiment. Note that, in the present embodiment, the rollers and the outer ring as rolling elements that constitute the bearing device together with the inner ring are shown in FIG.
Since it is the same as the prior art shown in FIG. In addition, the inner ring according to the present embodiment has the same configuration as that of the conventional art shown in FIG. 6 except for the features described below, and a description of common points will be omitted.

In FIG. 1, arc-shaped notches 121a functioning as oil grooves and notches for taking out the inner ring are formed at both ends (only one is shown) of the inner ring 121 as in the prior art. As a unique feature of the embodiment, an inner peripheral chamfered portion 121c is formed on the inner peripheral surface 121b of the inner ring 121. The inner peripheral chamfered portion 121c has a tapered shape in which the inner peripheral surface 121b is cut off at a constant taper angle. It is desirable that the taper angle is smaller than the angle of the chamfered portion 11a of the shaft end 11.

Here, if the depth (length in the axial direction) of the notch 121a is C and the depth (length in the axial direction) of the inner peripheral chamfered portion 121c is A, the relationship of C <A is established. Has become. That is, the inner peripheral chamfered portion 121b is formed to extend beyond the axially inner end of the notch 121a.

Next, the manner of assembling the inner race 121 according to the present embodiment will be described. FIG. 2 is a diagram illustrating a mode in which the inner race 121 is fitted into the shaft end 11 of the backup roll 10. First, as shown in FIG. 2A, if the inner ring 121 is inserted into the backup roll 10 in a state where the axis is inclined, unlike the related art, the inner peripheral chamfered portion 121 c becomes the chamfered portion 11 a of the shaft end 11. Without coming into contact with the outer surface 11b of the shaft end 11 without coming into contact with the chamfered portion 11a. Further, the inner ring 121 is directly
, The inner ring 21 advances in the direction along the shaft end 11 while being guided by the inner peripheral chamfered portion 121c (FIG. 2B). Thereafter, as shown in FIG. 2C, the inner peripheral surface 121b of the inner ring 121 is fitted to the outer peripheral surface 11b of the shaft end 11, and the roll fillet ring 12 (FIG. 5)
The assembly is completed by relative movement until it comes into contact with.

As described above, according to the present embodiment, even if notch 121a is formed in the end face of inner ring 121, inner ring chamfered portion 121 as described above is formed in inner ring 121.
By providing c, interference between the notch 121a and the boundary (B) on the shaft end 11 is suppressed, and assembling can be performed more easily. The notch 121a may have burrs (or burrs) when a tool or the like hits it. If the inner diameter is within the range of the inner chamfered portion 121c having a larger inner diameter than the surface 121b, the interference between the burrs and the chamfered portion 11a or the outer peripheral surface 11b is suppressed, and it is preferable that the burrs or the like hardly cause the catching or flaw.

FIG. 3 is a view similar to FIG. 1 according to a modification of the present embodiment. In FIG. 3, the inner peripheral chamfered portion of the inner ring 221 has two steps, that is, a first inner peripheral chamfered portion 221c having a taper angle α1 and a second inner peripheral chamfered portion 221d having a taper angle α2 larger than the taper angle α1. And

FIG. 4 is a view similar to FIG. 1 according to another modification of the present embodiment. In FIG. 4, the inner ring 321
The inner peripheral chamfer has three steps, that is, the taper angle α1
, A second inner circumferential chamfered portion 321d having a taper angle α2 larger than the taper angle α1, and a third inner circumferential chamfered portion 32 having a taper angle α3 larger than the taper angle α2.
1e. Also in the above modified example, the same operation and effect as those of the embodiment shown in FIG. 1 are obtained.

As described above, the present invention has been described with reference to the embodiments. However, the present invention should not be construed as being limited to the above embodiments, and it is needless to say that modifications and improvements can be made as appropriate. is there. For example, the rollers that are rolling elements may be tapered rollers or cylindrical rollers, and may be balls in some cases. Further, the present invention can be applied to a case where the inner ring is not limited to a backup roll but is attached to a work roll, an intermediate roll, or another shaft end.

[0019]

The bearing device of the present invention comprises an outer ring, an inner ring,
A rolling element rotatably arranged between the outer ring and the inner ring, wherein the inner ring is in a tubular shape, and the end face thereof has a notch and an axially inner end of the notch. Since the inner peripheral chamfered portion that extends beyond is formed, even when the inner ring is inserted into a shaft end or the like, interference between the notch and the shaft end is suppressed, so that the inner ring is more smoothly Can be inserted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an end of an inner race constituting a bearing device according to the present embodiment.

FIG. 2 shows an inner ring 121 and a shaft end 1 of a backup roll 10.
FIG. 2 is a diagram showing a mode of fitting into 1.

FIG. 3 is a view similar to FIG. 1 according to a modification of the present embodiment.

FIG. 4 is a view similar to FIG. 1, according to another modification of the present embodiment.

FIG. 5 is a diagram showing a mode in which an inner ring of a bearing device is attached to a shaft end of a backup roll as an example.

FIG. 6 is a perspective view of an inner race according to the related art.

FIG. 7 is a diagram showing a mode of removing an inner ring from a shaft end of a backup roll.

FIG. 8 shows the shaft end 11 and inner ring 21 of the backup roll 10.
It is a figure which expands and shows a part of.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Backup roll 11 Shaft end 11a Chamfer part 121,221,321 Inner ring 121b, 221b, 221c, 321b, 321c,
321d inner chamfer

Claims (1)

[Claims] 1. An outer race, an inner race, and a rolling element rotatably disposed between the outer race and the inner race, wherein the inner race is a tubular shape, and a notch is formed in an end face thereof. And an inner circumferential chamfer extending beyond the axially inner end of the notch.