JP2673421B2 - Rolling bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing having a boss portion projecting laterally from an inner ring.

[0002]

2. Description of the Related Art In a rolling bearing, for example, a ball bearing used in a roller conveyor, the outer peripheral portion of the ball bearing is press-fitted into the inner periphery of the roller, and the shaft is press-fitted into the inner peripheral portion of the ball bearing.
The shaft portion protruding from both ends of the roller is supported by the frame of the roller conveyor. Further, in order to provide a predetermined space between the frame and the end surface of the roller, a boss portion is provided to project laterally from the inner ring of the ball bearing.
Hardened steel is generally used for the inner ring and the outer ring of the rolling bearing in order to increase the load capacity.

[0003]

Since the boss portion described above is formed of the same hardened steel as the inner ring, it is exposed when it is used for a long time in a humid environment without being subjected to rust prevention treatment. There is a problem that rust occurs on the boss. Also, if rust-proof treatment, such as plating finish, is applied to the entire inner ring, rusting of the boss can be prevented, but while the rolling bearing is rotating, the plated metal applied to the rolling surface of the inner ring peels off, These debris mix with the grease to wear the steel balls, impair the lubricity of the grease, and shorten the service life of the bearing. This problem tends to occur remarkably in a seal type or shield type rolling bearing.

The present invention has been made in view of the above circumstances, and its purpose is to prevent rusting of the boss portion and
To provide reliable rolling bearings.

[0005]

According to a first aspect of the present invention, there is provided a rolling bearing in which a boss portion is integrally formed with the inner ring so as to project laterally from the inner ring, and the outer peripheral portion of the boss portion is made of a material which does not rust. The feature is that the rust cover is attached. Claim 2
The invention is characterized in that the rust-preventive cover has a dust-proof portion which faces the bearing and prevents dust from entering. The invention of claim 3 is characterized in that the rolling bearing is a seal type or a shield type.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is applied to a rolling bearing, that is, a ball bearing or a cylindrical roller bearing. Hereinafter, a first embodiment of the present invention according to claims 1 and 2 will be described with reference to FIG. The bearing case 1 is formed by bending a steel plate into a U-shaped cross section to form an outer peripheral portion 2 and an inner peripheral portion 3, and has a ring shape having an opening 4 from the end of the inner peripheral portion 3 toward the center. The side plate 5 is formed. The bearing case is not limited to a bent steel plate, but may be a machined one.

Next, a ball bearing 10 as a rolling bearing
Will be described. The inner ring 11 and the outer ring 12 are both made of hardened steel, and the inner peripheral end of the inner ring 11 is chamfered. A plurality of steel balls 13 are interposed between the inner ring 11 and the outer ring 12 by a retainer 14 at predetermined relational positions, and the steel balls 13 are filled with lubricating grease. The boss portion 15 has a cylindrical shape and has an inner ring 11
Is formed integrally with the inner ring 11 through the opening 4.
It projects laterally from.

The anticorrosion cover 16 is made of a material that does not rust, for example, a plated steel plate, and is attached by an adhesive so as to cover the outer peripheral portion and the end surface of the boss portion 15. still,
The anticorrosion cover 16 is not limited to a plated steel plate, and may be a stainless steel plate, a steel plate that has been subjected to antirust treatment such as painting or plating, or a plastic product. Further, the mounting means is not limited to adhesion, but may be mounted by press fitting or caulking, and in short, the boss portion 15 may be covered so as not to be exposed.

The dustproof portion 17 is provided so as to project from the end portion of the rustproof cover 16 toward the side surfaces of the outer ring 12 and the inner ring 11.
The outer peripheral end of the dustproof portion 17 faces the bearing case 1 with a slight gap therebetween, and prevents dust from entering the ball bearing 10. This ball bearing 10 has an outer ring 12
Is press-fitted into the bearing case 1 and integrated,
At the same time, it is attached to the inner peripheral portion of the roller 21 for the roller conveyor. A support shaft 22 of the roller 21 is press-fitted into the inner ring 11, and the support shaft 22 is supported by a frame of a roller conveyor (not shown).

According to the above-mentioned first embodiment, the following effects can be obtained. That is, the rolling surface of the inner ring 11 with which the steel balls 13 of the ball bearing 10 come into contact is precisely finished to ensure the lubrication performance. In addition, since the surface treatment is not performed, peeling pieces of plated metal are not mixed as in the conventional case, and dust is not infiltrated, so that the life of the ball bearing 10 is secured and high reliability is obtained. You can Further, since the boss portion 15 is covered with the rust preventive cover 16 and does not come into direct contact with the outside air, rust can be prevented from occurring.

FIG. 2 shows a second embodiment of the present invention. The difference from the first embodiment is that the ball bearing 31 is equipped with a synthetic rubber seal or a metal shield 32 on one side. It is a one-sided seal type or shield type. Here, the other surface side is sealed by the dustproof portion 17. According to the second embodiment, in addition to the effects of the first embodiment, the lubricating grease does not flow out and dust does not enter, so that the life of the bearing can be further extended. .

FIG. 3 shows a third embodiment of the present invention. The difference from the first embodiment is that the ball bearing 33 has a double-sided seal type or shield type in which seals or shields 32 are mounted on both sides. There is a point. The third embodiment also has the same effect as that of the second embodiment.

[0013]

According to the first aspect of the present invention, there is provided a rolling bearing in which a boss portion is integrally formed with the inner ring so as to project laterally from the inner ring. Therefore, it is possible to secure the life and enhance the reliability, and moreover, it is possible to prevent the boss portion from rusting. The inventions of claims 2 and 3 are effective in further extending the life of the bearing and preventing rusting of the boss portion.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of an upper half portion according to a second embodiment of the present invention.

FIG. 3 is a vertical sectional side view of an upper half portion in a third embodiment of the present invention.

[Explanation of symbols]

 10 Ball Bearings (Rolling Bearings) 11 Inner Ring 12 Outer Ring 13 Steel Balls 15 Boss Part 16 Anticorrosion Cover 17 Dustproof Part 31 Ball Bearings (Rolling Bearings) 33 Ball Bearings (Rolling Bearings)

Claims (3)

(57) [Claims] 1. A rolling bearing having a boss projecting laterally from the inner ring integrally with the inner ring, wherein a rust preventive cover made of a rust-proof material is attached to an outer peripheral part of the boss. bearing. 2. The rolling bearing according to claim 1, wherein the anticorrosion cover includes a dustproof portion facing the bearing to prevent dust from entering. 3. The rolling bearing according to claim 1, wherein the rolling bearing is a seal type or a shield type.