JP2002155957A - Plural row bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent infiltration of water, foreign matter or the like into the inside of a bearing without incurring cost, in a double row bearing of a raceway split type double row bearing. SOLUTION: In a raceway split type double row cylindrical roller bearing B2, cylindrical rollers 13 in a plural rows are shut in between an outer ring 11 and an inner ring 12, and the inner ring 12 is split for each row of the cylindrical rollers 13. Abutting end surfaces of the split inner rings 12A, 12B is provided with a groove 16, and an O ring 18 for sealing a clearance between the end surfaces of the split inner rings 12A, 12B is attached in the groove 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raceway ring type double row bearing.

[0002]

2. Description of the Related Art FIG. 5 is a cross-sectional view showing an example of a raceway ring split type double row cylindrical roller bearing. This double row cylindrical roller bearing B1
Is such that a cylindrical roller 3 as a rolling element is sandwiched between an outer ring 1 and an inner ring 2 in a double row.
It is divided into two inner rings 2A, 2B. A flange 4 for regulating the position of the cylindrical roller 3 is provided at the center in the width direction of the inner peripheral surface of the outer ring 1.
Are provided at both ends of the outer peripheral surface of each of the divided inner races 2A and 2B, and a flange 5 for regulating the position of the cylindrical roller 3 is provided. A retaining ring 6 and a seal 7 are provided at both ends of the inner peripheral surface of the outer ring 1. In the illustrated example, the bearing B1 divides the inner race 2 into two for each row of the cylindrical rollers 3, but there are some bearings that divide the outer race 1 into two.

[0003] This type of bearing of a raceway split type is a bearing used by abutting the end faces of a split inner ring or outer ring, and one of its main applications is a bearing for a crane sheave. Bearings used in such applications are
Since it is rarely used in a clean environment and is often used in a rough environment, water and foreign matter enter the bearing from the gap between the butted end faces of the divided races, which causes the bearing to Often the life was shortened.

Therefore, as a preventive measure, as shown in FIG. 5, divided races (in the illustrated example, inner races 2A and 2B).
Are connected by a fastening tube 8 so that no gap is formed between the butted end faces.

[0005]

However, this fastening tube 8
However, since it is necessary to newly make the bearing according to the difference in the mounting diameter of the bearing, there is a problem that the cost increases, and in practice, this preventive measure has not been used so much.

The present invention has been made in view of the above circumstances, and has as its object to provide a raceway-split split-row double-row bearing that can prevent water, foreign matter, and the like from entering the inside of the bearing without incurring much cost. And

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a raceway ring division in which rolling elements are sandwiched in two rows between two raceways of an outer ring and an inner ring, and one raceway is divided for each row of rolling elements. In the double row bearing of the type described above, a groove is provided in the end face of the divided bearing ring, and an O-ring is attached to the groove to seal a gap between the end faces of the divided bearing ring.

[0008] Here, the divided races may be inner races or outer races. In addition, although the rolling elements mainly consider cylindrical rollers, they need not necessarily be cylindrical rollers. Further, the groove for attaching the O-ring may be provided on both the butted end faces, but it is preferable to form the groove only on one end face in consideration of processing cost.

In this bearing, since an O-ring is interposed between the butted end faces of the divided races, even if a gap is formed between the end faces, there is no danger that water or foreign matter will enter therefrom. As a result, it is possible to contribute to extending the life of the bearing.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a double-row cylindrical roller bearing B2 of the embodiment. The double row cylindrical roller bearing B2 has a cylindrical roller 13 as a rolling element interposed between an outer ring 11 and an inner ring 12 in a double row. The inner ring 12 has two inner rings 12A, 12B for each row of the cylindrical rollers 13. Is divided into Outer ring 1
A flange 14 for regulating the position of the cylindrical roller 13 is provided at the center in the width direction of the inner peripheral surface of the inner ring 1.
At both ends of the outer peripheral surface of 12B, a flange 15 for regulating the position of the cylindrical roller 13 is provided, and the inner ring 12 is divided for necessity in assembly. Further, seals 17 are provided at both ends of the inner peripheral surface of the outer ring 11 to seal a gap between the outer ring 11 and the inner ring 12.

The bearing B2 has a divided inner ring 12A,
12B is used by abutting the end faces thereof, and a groove 16 is formed on one of the abutting end faces.
A commercially available O-ring 18 that can seal the gap between the butted end faces is attached.

In this case, the divided inner rings 12A, 12B
After managing the maximum gap Δmax formed between the butting end surfaces of the O-rings 18, the natural width Wo of the O-ring 18 shown in FIG.
And the depth Wb of the groove 16 from the butt end face shown in FIG. 9 are determined so as to satisfy the relationship of Δmax + Wb <Wo.

By doing so, even when the gap between the inner rings 12A and 12B is the widest (Δmax), the O-ring 18 keeps the shape crushed from the side and can reliably fill the gap between the inner rings 12A and 12B. it can. FIG. 1 shows inner rings 12A, 1
FIG. 4 is a cross-sectional view when the gap between the inner rings 12A and 12B is zero when the gap between the inner rings 2B is the maximum (Δmax).

Accordingly, it is possible to prevent water and foreign substances from entering through the gap between the inner rings 12A and 12B, and it is possible to extend the life of the bearing. Further, since the groove 16 is formed on the end face and the commercially available O-ring 18 is merely attached to the groove 16, the cost does not increase.

The shape of the groove 16 is not limited.
May be formed on both butted end faces.

The same effect can be obtained if the bearing is of an end-butt type in which the maximum gap between the end faces can be managed. For example, in the illustrated bearing B2, the inner race 12 is divided into two for each row of the cylindrical rollers 13, but the present invention can also be applied to a bearing in which the outer race 11 is divided into two. In that case, a groove may be formed in the butted end surface of the divided outer ring, and an O-ring may be attached to the groove.

In addition, the materials, shapes, dimensions, forms, numbers, arrangement locations, and the like of the outer ring, the inner ring, the rolling members, the cage, the base, the pocket, the eccentric mass, and the like exemplified in the above-described embodiment are the present invention. Is arbitrary as long as it can achieve
Not limited.

[0018]

As described above, according to the present invention,
Even if a gap is formed between the divided races, this can be reliably sealed by the O-ring. Therefore, even when used under bad conditions, it is possible to prevent water, foreign matter, and the like from entering through the gap between the races, thereby extending the life of the bearing. Moreover, since the O-ring is merely attached, there is no possibility that the cost is increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a bearing according to an embodiment of the present invention, showing a state in which a gap between butt end surfaces of divided races is maximized.

FIG. 2 is a sectional view of an O-ring used in the bearing in a natural state.

FIG. 3 is a sectional view of a main part of the bearing.

FIG. 4 is a cross-sectional view of the bearing according to the embodiment of the present invention, showing a state in which a gap between the butted end faces of the divided races is zero.

[Explanation of symbols]

 B2 Double row cylindrical roller bearing 11 Outer ring 12 Inner ring 12A, 12B Split inner ring 13 Cylindrical roller (rolling element) 16 Groove 18 O-ring

Claims (1)

[Claims] 1. A raceway ring split type double row bearing in which rolling elements are sandwiched in two rows between two raceways of an outer ring and an inner race, and one raceway is divided for each rolling element row. A double row bearing, wherein a groove is provided in a butt end surface of a divided race and an O-ring is attached to the groove to seal a gap between end surfaces of the divided races.