JPH0988940A - Two-piece bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thicken a thickness of a housing of this part, and increase load capacity without thinning a shaft diameter by arranging a flat part on a circular arc-shaped outer peripheral surface of an outer ring arranged in a part of a housing half body on the side to receive a load. SOLUTION: A flat part 21 on the inner periphery of a load side housing half body 14a opposed to an outer ring outer peripheral flat part 20 is formed in parallel to the outer ring outer peripheral flat part 20, and a space part 22 is formed between the outer ring outer peripheral flat part 20 and a housing inner peripheral flat part 21. Reaction of a load can be prevented from being directly applied to a part of a housing 14 whose thickness is thinnest by this space part 22. Since reaction of this load is applied to the housing 14 through a peripheral contact part 23 between the outer ring outer peripheral flat part 20 and the housing inner peripheral flat part 21, it can be similarly prevented from being applied to a part of the housing 14 whose thickness is thinnest.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-divided bearing device, and more particularly to a two-divided bearing device used for a shaft to which a load is applied in a direction perpendicular to the axial direction in equipment such as continuous casting equipment and rolling roller equipment.

[0002]

2. Description of the Related Art A shaft that is loaded in a direction perpendicular to the axial direction used in equipment such as continuous casting equipment and rolling roller equipment is
Deflection is likely to occur in the central portion, and in order to prevent the deflection, bearings are provided not only at both ends of the shaft but also in the central portion of the shaft. The bearing provided in the central portion of the shaft is divided into two parts such as an inner ring, an outer ring, and a housing for the purpose of mounting in a plane passing through the shaft center. Further, the shaft is used for transportation, rolling, etc. of the cast product of the equipment, and at the portion where the shaft contacts the cast product, rolled plate, etc., a load is applied from the contact portion toward the axial center. In order to smoothly carry and roll, it is not possible to provide a projecting portion in the portion that receives the load of the shaft where the work such as carrying and rolling is performed. For this reason, the outer peripheral surface of the housing of the bearing, which is disposed in the portion that receives the load, is formed closer to the axial center than the outer peripheral surface of the shaft.

As shown in FIGS. 5 and 6, in this two-divided bearing, a cylindrical inner ring 1 in which two inner ring halves, which are divided into two parts on the plane passing through the shaft center, are fastened, has a small diameter portion 6a of a shaft 6. And an outer ring 3 with a cylindrical roller 2 interposed in the center of the outer peripheral surface of the inner ring 1.
Is provided. A housing 4 is provided around the outer ring 3 by fastening housing halves 4a and 4b, which are divided into two parts by a plane passing through the axis.

The housing 4 has a predetermined load side housing half 4a arranged on the side receiving the load so that the outer peripheral surface thereof is closer to the axial center than the outer peripheral surface of the large diameter portion 6b of the shaft 6. Has a thickness of. The other housing half 4b can fix the bearing to a wall or the like.

In FIG. 5, the outer ring 3 is divided into two parts along a plane passing through the axis, and the load side outer ring half 3a is arranged on the side receiving the load and the outer ring half 3 is arranged on the fixed side of the bearing.
b, and the outer ring 3
Is formed.

Further, the load is a line parallel to the axial direction on the outer peripheral surface of the shaft 6, which is provided for rolling, conveying, etc. of the rolled plate 7 and cast products, that is, the axial load line 8. receive. This load is applied from the shaft load line 8 in the axial direction, and the inner ring, the cylindrical roller, and the outer ring located on the opposite side of the shaft load line 8 through the small-diameter portion 6a of the shaft 6 are also applied to the two-divided bearing. , Housing etc. The housing 4 is generally made of cast metal and has a low load capacity, and therefore is protected by the outer ring 3 made of a high-strength material such as steel. In order to efficiently receive the load, the fixed outer ring half body 3b arranged at this position has an outward arcuate shape from one end face to the other end face thereof. The outer ring half 3a has the same structure.

In the two-divided bearing of FIG. 5, the outer peripheral surface of the housing half 4a on the side receiving the load is arranged closer to the axial center than the outer peripheral surface of the large diameter portion 6b of the shaft 6. That is, the line where the surface formed by the axial load line 8 and the axial center intersects with the outer peripheral surface of the load-side housing half body 4 a, that is, the housing load line 9 is arranged closer to the axial center than the axial load line 8.
Therefore, the thickness of the load-side housing half 4a is limited. In particular, in the surface formed by the housing load line 9 and the shaft center, the thickness between the housing load line 9 and the apex of the arc portion of the load side outer ring half body 3a becomes the smallest, so that when a large load is applied, the above-mentioned portion is indented. May occur or cracks may occur. In order to solve such a problem, as shown in FIG. 6, there is also known a two-divided bearing in which the outer ring half body is not provided on the load receiving side and only the outer ring half body 3b on the fixed side of the bearing is provided. .

By not providing the outer ring half body on the side receiving the load, the thickness of the housing half body 4a on the load side can be increased by the amount of the outer ring half body, and the above-mentioned indentations and cracks can be prevented.
In this case, since the outer ring does not exist on the side that receives the load, the strength itself of this portion is reduced, but the load applied to this two-divided bearing is on the fixed side on the opposite side of the housing load line 9 with respect to the axial center. Since it is applied to the inner ring, the outer ring, etc., the strength itself of the two-sided bearing on the load side does not decrease.

[0009]

However, when the load is removed, a reaction force in the direction opposite to the direction in which the load is applied is generated due to the law of inertia. That is, the reaction force from the axis toward the housing load line 9 is generated.
In the two-divided bearing of FIG. 6, since there is no outer ring on the load receiving side, the load half housing half 4 made of casting or the like is used.
All reaction force is applied to a. For this reason, even if the thickness is increased, indentation, cracking, etc. occur because the strength is weaker than that of the outer ring made of high-strength material such as steel.

In order to overcome this, an outer ring is provided on the side receiving the load as shown in FIG. 5, and in order to increase the thickness of the housing half 4a on the side receiving the load, the small diameter portion 6a of the shaft 6 is provided. It is possible to make it thinner. However, if the shaft small-diameter portion 6a is made thin, the load capacity of the shaft 6 itself decreases, and the load cannot be withstood in some cases.

Therefore, an object of the present invention is to sufficiently withstand a large load applied to the two-divided bearing without reducing the shaft diameter.

[0012]

In order to solve the above-mentioned problems, the present invention is divided into two parts, a small-diameter portion of which the diameter is partly small and the above-mentioned small-diameter portion of a shaft having another large-diameter portion. The inner ring halves are annularly combined to form an inner ring, the outer ring is arranged around the inner ring via cylindrical rollers, the housing is arranged around the outer ring, and the outer peripheral surface of the outer ring is
It has an arcuate shape outward from one end face to the other end face, and a part of the outer surface of the housing is located closer to the shaft center of the shaft than the outer peripheral surface of the large diameter part of the shaft. In the cylindrical roller bearing device, the outer peripheral surface of the housing has a flat portion on the arc-shaped outer peripheral surface of the outer ring arranged in the housing portion located closer to the shaft center of the shaft than the outer peripheral surface of the large diameter portion of the shaft. It was provided.

The outer periphery of the outer ring of the outer ring disposed on the portion of the housing located closer to the axial center than the outer periphery of the large diameter portion of the shaft, that is, the portion of the housing half on the side receiving the load, has an arc-shaped outer periphery. Since the flat portion is provided on the surface, the thickness of the housing in this portion can be increased, and the load capacity can be increased without reducing the shaft diameter.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

The two-part bearing device of the present invention is shown in FIGS.
As shown in FIG. 2, the inner ring 11 is formed by fastening the inner ring halves 11a and 11b, which are divided in two by a plane passing through the axis, to the shaft thin portion 16a in which the diameter of a part of the shaft 16 is reduced, and annularly combining them. The outer ring 13 is formed by annularly fastening the outer ring halves 13a and 13b, which are divided into two parts, on the outer peripheral surface of the inner ring 11 through the cylindrical roller 12 at the plane passing through the axis. This outer ring 1
By fastening the housing halves 14a and 14b, which are divided into two parts, around the surface of the housing 3 along the plane passing through the axis,
Is arranged.

Since the shaft 16 provided with the above-mentioned two-divided bearing device is used for rolling, transporting, etc. of the rolled plate 17 and cast products,
The load is applied to the outer peripheral surface of the shaft 16 in a line parallel to the axial center,
That is, it is received by the axial load line 18. Since it is used for the rolling, the transportation, etc., the outer peripheral surface of the honing 14 on the side receiving the load is arranged closer to the axial center than the outer peripheral surface of the large diameter portion 16b of the shaft 16. That is, the housing half body 1 on the surface formed by the shaft load line 18 and the shaft center and on the side receiving the load.
A line intersecting with the outer peripheral surface of 4a, that is, the housing load line 19 is arranged closer to the axial center than the axial load line 18.

The housing 14 comprises a load side housing half body 14a on the side receiving the load and a housing half body 14b for fixing the two-divided bearing device itself. The outer ring 13 is composed of a load side outer ring half body 13a arranged on the side for receiving the load and an outer ring half body 13b arranged on the opposite side to the fixed side housing half body 14b. There is.

The outer peripheral surface of the outer ring 13 has an arcuate shape outward from one end to the other end in order to efficiently receive the above-mentioned load. Further, the outer ring 13 arranged in the housing 14 portion where the outer peripheral surface of the housing 14 is closer to the axial center than the outer peripheral surface of the large diameter portion 16b of the shaft 16 is flattened by cutting the arc on the outer peripheral surface. Part 20
Is provided. It is particularly preferable that the line formed by the housing load line 19 and the shaft center and the plane perpendicular to the shaft center passing through the apex of the arc of the arc-shaped outer peripheral surface of the outer ring 13 intersect the load side outer ring half. Centering on a predetermined point passing through the body 13a, parallel to the housing load line 19,
In addition, it is to be ground by a surface perpendicular to the surface composed of the housing load line and the shaft center to form the surface as the flat portion 20 on the outer periphery of the outer ring. As shown in FIG. 4, the flat portion 20 has a shape in which the periphery is covered with a curved line.

As shown in FIG. 3, the inner peripheral portion of the load-side housing half 14a facing the outer ring outer peripheral flat portion 20 has a thickness increased to form a flat surface. As a result, it is possible to improve the thinness of the thickness between the housing load line 19 and the apex of the arc portion of the load side outer ring half body 13a on the surface formed by the housing load line 19 and the shaft center, and the load capacity of this portion can be reduced. Can be increased.

A flat portion 21 on the inner periphery of the load side housing half body 14a facing the outer ring outer peripheral flat portion 20 is formed in parallel with the outer ring outer peripheral flat portion 20, and the outer ring outer peripheral flat portion 20 and the housing inner periphery are formed. A space 22 is formed between the flat portions 21. With this space, it is possible to prevent the reaction force of the load from being directly applied to the portion of the housing 14 having the smallest thickness. Further, since the reaction force of the load is applied to the housing 14 via the contact portion 23 around the outer ring outer peripheral flat portion 20 and the housing inner peripheral flat portion 21,
Similarly, it can be prevented that the portion of the housing 14 having the smallest thickness is reached.

[0021]

According to the present invention, the portion of the housing in which the outer surface of the housing is located closer to the axial center of the shaft than the outer peripheral surface of the large diameter portion of the shaft, that is, the portion of the housing half that receives the load. Since the flat portion is provided on the arcuate outer peripheral surface of the outer ring disposed in the above portion, the thickness of the housing in this portion can be increased, and the load capacity can be increased without reducing the shaft diameter.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a two-divided bearing device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partially enlarged sectional view of FIG.

FIG. 4 is a plan view of the outer ring outer peripheral flat portion of FIG.

FIG. 5 is a partial sectional view showing a conventional two-divided bearing device.

FIG. 6 is a partial sectional view showing another conventional two-divided bearing device.

[Explanation of symbols]

 1 Inner ring 2 Cylindrical roller 3 Outer ring 3a Load side outer ring half body 3b Fixed side outer ring half body 4 Housing 4a Load side housing half body 4b Fixed side housing half body 5 Sealing material 6 Shaft 6a Shaft small diameter portion 6b Shaft large diameter portion 7 Rolling Plate 8 Axial load line 9 Housing load line 11 Inner ring 11a, 11b Inner ring half body 12 Cylindrical roller 13 Outer ring 13a Load side outer ring half body 13b Fixed side outer ring half body 14 Housing 14a Load side housing half body 14b Fixed side housing half body 15 Seal Material 16 Shaft 16a Shaft small diameter portion 16b Shaft large diameter portion 17 Rolling plate 18 Shaft load line 19 Housing load line 20 Outer ring outer peripheral flat portion 21 Housing inner peripheral flat portion 22 Space portion 23 Contact portion

Claims (1)

[Claims] 1. An inner ring is formed by annularly combining two halved inner ring halves into the small diameter part of a shaft having a small diameter part of which part has a smaller diameter and another large diameter part.
An outer ring is arranged around the outer ring through cylindrical rollers, a housing is arranged around the outer ring, and an outer peripheral surface of the outer ring has an outward arc shape from one end surface to the other end surface, and In a two-part cylindrical roller bearing device in which a part of the outer surface of the housing is located closer to the shaft center of the shaft than the outer surface of the large diameter part of the shaft, the outer peripheral surface of the housing is the outer circumference of the large diameter part of the shaft. A two-split bearing device characterized in that a flat portion is provided on the arcuate outer peripheral surface of the outer ring arranged in the housing portion located closer to the shaft center of the shaft than the surface.