JPH11218137A - Split rolling bearing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split rolling bearing unit in which bending stress does not directly act upon fastening bolts. SOLUTION: A split rolling bearing unit has an outer ring bisected along an axis; an inner ring 1 bisected along the axis and provided with collar parts at both end parts; rolling elements arranged between the inner ring 1 and outer ring; and fastening bolts 6 arranged at the collar parts of the inner ring 1 so as to fasten the divided inner ring 1 integrally. The fastening bolt 6 is positioned axially outside of a fitting contact face part 9 of the inner ring 1 to a shaft 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split type rolling bearing unit mainly used in a drive roll support of a continuous casting facility.

[0002]

2. Description of the Related Art The neck axis of a drive roll of a continuous casting facility is formed in a punch shape having a small diameter at a central portion for transmitting a rotational force. In this case, the bearing that supports the roll neck shaft at the center part has an outer ring divided into two along the axis in terms of assembly,
An inner ring divided into two along the axis and having rolling element guiding flanges formed at both ends, a rolling element disposed between the inner ring and the outer ring, and a divided inner ring disposed on the inner ring flange and integrated with the inner ring A split-type rolling bearing unit having a fastening bolt for fastening the bearing is used. 2 and 3 show the relationship between the inner ring and the fastening bolt. The inner ring 20 has a raceway surface 21 on the outer peripheral surface of a central portion on which rolling elements roll, and flange portions 22 and 23 formed on outer peripheral surfaces of both ends to guide the rolling elements, and two semicircular rings 20a along the axis. , 20b. Inner ring 20
The inner peripheral surface has a fitting contact surface portion 24 having an axial width A which is fitted to and contacted with the neck shaft 30 at the center portion thereof, and arcuate surfaces 25 and 26 having both end portions which are non-fitting contact surface portions. Is formed. The fitting contact surface portion 24 extends to substantially the center in the axial direction of the flange portions 22 and 23. Further, the inner ring 20
The flanges 22 and 23 located on the fitting contact surface 24 of the
As shown in FIG. 3, a fastening hole 28 for a fastening bolt 27 is formed over the two semicircular rings 20 a and 20 b, and the two semicircular rings 20 a and 20 b are integrally formed by the fastening bolt 27 on the neck shaft 30. Fixed to 29 is the inner ring 20
Are the mating surfaces of the semicircular rings 20a and 20b constituting the circle.

[0003]

In the above-mentioned split type rolling bearing unit, the position of the fastening bolt 27 is arranged within the axial width A of the fitting contact surface portion 24 with the neck shaft 30 of the inner race 20. Therefore, the neck shaft 30 under high load
The bending stress caused by the bending directly acts on the fastening bolt 27, and the fastening bolt 27 may be damaged.

An object of the present invention is to provide a split type rolling bearing unit in which bending stress does not directly act on a fastening bolt.

[0005]

As means for solving the above problems, an outer ring divided into two along the axis and an inner ring divided into two along the axis and provided with flanges at both ends are provided. In a split type rolling bearing unit having a rolling element disposed between an inner ring and an outer ring, and a fastening bolt disposed on a flange portion of the inner ring and integrally fastening the divided inner rings, the position of the fastening bolt is determined. , Characterized in that the inner ring is axially outside the fitting contact surface with respect to the shaft.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a split type rolling bearing unit according to the present invention basically includes an outer ring 2 divided into two along an axis, and a rolling element guide at both ends divided into two along an axis. An inner ring 1 having flanges 3 and 4 formed thereon, and a rolling element 5 disposed between the inner ring 1 and the outer ring 2
And fastening bolts 6 arranged on the flanges 3 and 4 of the inner ring 1 to integrally fasten the divided inner rings 1.

The inner race 1 has a raceway surface 7 on which the rolling elements 5 roll on the outer peripheral surface of the central portion, and flanges 3 and 4 for guiding the rolling elements 5 on the outer peripheral surfaces of both ends, and are formed along the axis. It is divided into two semicircular rings 1a, 1b. The inner peripheral surface of the inner ring 1 has an axial width A at a central portion thereof which is fitted to and comes into contact with the neck shaft 8.
, And an arcuate surface 10 whose both ends are non-fitting contact surfaces. This mating contact surface 9
Extends substantially to the vicinity of the rolling element guide surfaces 3a, 4a of the flange portions 3, 4. The two semicircular rings 1 are located at the positions of the flanges 3 and 4 not located on the fitting contact surface 9 of the inner ring 1.
A fastening hole 11 for the fastening bolt 6 is formed straddling a and 1b, and the two semicircular rings 1a and 1b are integrally fixed to the neck shaft 8 by the fastening bolt 6. This fixing structure is the same as that of the conventional FIG.

[0008]

As described above, in the split type rolling bearing unit of the present invention, the position of the fastening bolt is located outside the axial width of the fitting contact surface portion with respect to the neck shaft of the inner race. In addition, the bending stress due to the bending of the neck shaft under a high load does not directly act on the fastening bolt, thereby preventing the fastening bolt from being damaged.

[Brief description of the drawings]

FIG. 1 is a sectional view of a split-type rolling bearing unit according to an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional split-type rolling bearing unit.

FIG. 3 is a partial cross-sectional view of the inner race taken along line XX of FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 inner ring 2 outer ring 3 flange 4 flange 5 rolling element 6 fastening bolt 8 neck shaft 9 fitting contact surface

Claims (1)

[Claims] 1. An outer ring divided into two along an axis, an inner ring divided into two along an axis and provided with flanges at both ends, and a rolling element disposed between the inner ring and the outer ring. And, in a split type rolling bearing unit having a fastening bolt disposed on a flange portion of the inner ring and integrally fastening the divided inner ring, the position of the fastening bolt is set to be axially outside the fitting contact surface portion with respect to the shaft of the inner ring. A split type rolling bearing unit characterized in that: