JPH0658337A - Bearing with seal - Google Patents

Abstract

PURPOSE: To provide a bearing with a seal capable of securing normal load capacity without increasing width of the bearing. CONSTITUTION: This is a bearing having an inner ring 1, an outer ring, a single row or a plural rows of rolling elements 3 arranged between the inner and outer rings 1, 2 and a built-in seal member 4, the mounting groove 5 for the seal member 4 is formed at least on one side part of the outer ring 2, the mounting groove 5 is positioned inward rather than a side surface of the outer ring 2, and it is at a tapered angle a against the side surface. Additionally, an opening part of the mounting groove 5 formed on the outer ring 2 is positioned outside in the axial direction rather than a raceway surface of the outer ring 2, and a bottom part of the mounting groove 5 is positioned inside in the axial direction rather than an end part of the raceway surface of the outer ring 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed bearing.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
A bearing having an inner ring, an outer ring, a single-row or double-row rolling element arranged between the inner and outer rings, and a built-in seal member, wherein the outer ring has the seal member on at least one side. There is known a sealed bearing in which a mounting groove is formed, the mounting groove is located inward of a side surface of the outer ring, and has a taper angle with respect to the side surface.

The life of the bearing is shortened by dust, impurities and the like that enter the bearing. The assembly of the bearing may be performed in a dusty environment, and the bearing may be operated while being exposed to dust, metal powder or the like. Bearings for continuous casting, rolling mills, papermaking machines, etc. are operated in an environment containing various impurities. This requires sufficient maintenance.

Therefore, in order to sufficiently secure the life of the bearing, it is important to provide a good seal for the bearing, and this makes maintenance unnecessary.

The known sealed bearings are basically classified into two principles. That is, the seal is either attached to the bearing or integrated into the bearing. First, regarding the former, Swedish patent application No. 4
No. 54909 (corresponding Japanese patent application: Japanese Patent Application No. 62-283)
219), and Swedish Patent Application No. 45108.
There is one disclosed in Japanese Patent No. 1 (corresponding Japanese patent: Japanese Patent No. 1611204). The seals disclosed in these documents have two cooperating metal seat rings,
At least one metal seat ring is fitted in the outer ring, and the other is attached to the inner ring. However, this seal has a problem that it protrudes from the side surface of the bearing. In this case, the bearing housing must be deformed and the built-in tool or the like must be redesigned.

In the latter case, the seal is integrally built in the bearing. In this case, the seal does not protrude from the side surface of the bearing. The seal assembly, which is located more inward than one of the two sides of the bearing, requires a large amount of space, which is why
Conventional solutions result in larger bearing widths or smaller roller lengths. That is,
Known sealed bearings have a large width dimension in order to maintain the same load capacity as the corresponding unsealed bearing. In this case, the seal is attached to the radial groove of the outer ring, and is fixed by the lock ring in the radial groove.
The opposite edge of the seal engages the tapered surface of the inner ring (it is also well known to attach a seal having a rubber lip to the outer ring).

Mounting the seal in the radial groove for the lock ring requires a large space in the axial direction. This means that the width of the outer ring is increased in order to secure the load capacity, which is a drawback when the bearing is miniaturized in the application field and the standards such as ISO are maintained.

Another drawback is that mounting with a rubber lip does not ensure a certain high holding force.

Further, in the spherical roller bearing, there is a drawback that the roller comes into contact with the seal and the seal is loosely held thereby.

An object of the present invention is to have an integrally incorporated seal and to minimize the space therefor so that the width of the outer ring is not so large as compared with a corresponding bearing without a seal, and the load capacity, the allowable capacity and the allowance can be reduced. It is to provide a bearing with a seal that can secure a sufficient speed and the like.

[0011]

According to the present invention, the above object is to provide an inner ring and an outer ring, a single-row or double-row rolling element arranged between the inner and outer rings, and a built-in seal member. And a mounting groove for the seal member is formed on at least one side of the outer ring, and the mounting groove 5 is located inward of a side surface of the outer ring and has a taper angle with respect to the side surface. The opening of the mounting groove formed in the outer ring is located axially outside the raceway surface of the outer ring, and the bottom of the mounting groove is axially inner than the end of the raceway surface of the outer ring. It is achieved by being located in.

In a preferred form, the seal member is
It is fixed by a lock ring in the mounting groove.

In order to mount the seal member more securely and safely, the seal groove is fixed by a lock ring having a taper angle (β) slightly smaller than the taper angle (α) of the mount groove. It is better to create a preload between them. It has been proved that the mounting groove has a taper angle (α) of 15 to 20 degrees.

A bearing having such a seal member is suitable for a spherical roller bearing.

[0015]

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

FIG. 1 is a sectional view of an example of a seal member attached to a spherical roller bearing. FIG. 2 is a sectional view of such a spherical roller bearing. 3 is an enlarged partial sectional view of the lock ring.

The spherical roller bearing 10 has an inner ring 1, an outer ring 2, rolling elements 3 arranged between the inner and outer rings 1 and 2, and a retainer 11 for the rolling elements. Sealing members 4 are provided on both side surfaces of the bearing, and the sealing members 4 are located inside the side surfaces of the bearing 10 as illustrated. The seal member 4 is mounted in a mounting groove 5 formed in the outer ring 2. The mounting groove 5 is formed in a taper having an angle α with respect to the bearing side surface when the side surface of the bearing is perpendicular to the axis. The tapered surface can be variously selected such that it is formed as a number of conical surfaces whose center lies on the axis and the center lies a distance from the intersection of the bearing flank and the axis. The angle α is preferably 15 to 20 degrees.

The seal member 7 has a plate-shaped ring, and is radially inwardly tapered so that the outer peripheral portion of the ring has a taper angle approximately equal to the taper angle α of the mounting groove 5.
The inner peripheral portion of the ring 7 is bent inward so as to form an axially extending portion. The ring 7 is completely or partially covered by a rubber 8, for example the rubber 8
Are provided on the ring 7 by adhesion or vulcanization. At the outer peripheral portion of the ring 7, the rubber 8 is formed like the extension portion of the ring 7, and at the inner peripheral portion of the ring 7, the rubber 8 is formed.
An extending portion 12 is formed to extend outward with a taper angle so as to be engaged with the tapered surface 9 of. The tapered surface 9 of the inner ring 1 may be a spherical surface.

The outer peripheral portion of the seal member 8 is attached to the outer ring 2 by the attachment groove 5 of the outer ring 2 and fixed by the lock ring 6. The lock ring 6 preferably has a taper angle β. The angle β is preferably slightly smaller than the taper angle α of the mounting groove 5. In the illustrated example, the angle α is 15 degrees and the angle β is 11 degrees.

Since the taper angle β of the lock ring 6 is smaller than the angle α, a preload is generated between the lock ring 6 and the seal member 4. This results in a reliable and stable installation. The seal member 4 is removable, and maintenance and inspection can be easily performed.

A lock ring with an angle β of zero degrees is also possible. That is, the ring has no taper. When such a lock ring is used, the fixing effect between the seal member and the lock ring in the mounting groove becomes extremely large.

The shape of the seal member 4 and the lock ring 6,
The material can be variously deformed by the bearing. The present invention is not limited to the embodiments, but can be implemented with various modifications within the scope of the claims.

[Brief description of drawings]

FIG. 1 is a sectional view of a seal member attached to a spherical roller bearing according to an embodiment of the present invention.

2 is a sectional view of a spherical roller bearing having the seal member of FIG.

FIG. 3 is an enlarged partial sectional view of a lock ring used in the device of FIG.

[Explanation of symbols]

 1 inner ring 2 outer ring 3 rolling element 4 seal member 5 mounting groove 6 lock ring 8, 12 rubber 10 bearing α, β taper angle

Claims (8)

[Claims] 1. An inner ring (1), an outer ring (2), a single row or double row rolling element (3) arranged between the inner and outer rings (1, 2), and a built-in seal member (4). A bearing having a mounting groove (5) for the seal member (4) is formed on at least one side of the outer ring (2), and the mounting groove (5) is a side surface of the outer ring (2). Located more inward than
In the case where a taper angle (α) is formed with respect to the side surface, the opening of the mounting groove (5) formed in the outer ring (2) is located axially outside the raceway surface of the outer ring (2), A bearing with a seal, characterized in that the bottom of the mounting groove (5) is located axially inward of the end of the raceway surface of the outer ring (2). 2. The rolling element is a roller (3), and the bottom portion of the mounting groove (5) is located axially inward of the virtual extension surface of the end surface of the roller (3). Bearing with seal as described. 3. Sealing member (4) engaging with the inner ring (1) and mounted on the outer ring (2) by a lock ring (6) in the mounting groove (5). The bearing with a seal according to Item 2. 4. The lock ring (6) has a taper angle slightly smaller than the taper angle of the mounting groove (5),
The sealed bearing according to claim 3, wherein a preload is applied between the mounting groove (5) and the sealing member (4). 5. The taper angle (α) of the mounting groove (5) is 15
The sealed bearing according to claim 4, wherein the bearing is -20 degrees. 6. The sealed bearing according to claim 3, wherein the lock ring has a flat plate shape without taper. 7. A seal member (4) is covered with a rubber (8, 12) or the like on a reinforcing plate (7), and is attached so as to engage with a tapered or spherical portion of an inner ring. The sealed bearing according to any one of claims 5 to 6. 8. A bearing with a seal, wherein the bearing (10) is a spherical roller bearing.