Koyo Seiko Company, Ltd.

Masao Nunotani

Masaaki Matsumoto

A tapered roller bearing having an inner ring and an outer ring, each respectively having a tapered race, a plurality of tapered rollers, a cage which retains the tapered rollers at an even interval in the circumferential direction and first and second seals. The first seal has a lip and main element, the main element having mounted on the small diameter end portion of the inner ring, and the lip being forced in the axial outward direction of the bearing against the outer ring, and separated from the outer ring when forced in the inward axial direction. The second seak has a lip and main element, the main element mounted on the large diameter end portion of the inner ring, and the lip forced in the axial inward direction of the bearing against the outer ring, and separated from the outer ring when forced in the axial outward direction. The lips of the first seal and second seal are moved and separated from the outer ring, thus creating a clearance, by a force acting in the same direction. Lubrication is accomplished by supplying lubricating oil to this bearing in the one direction, so that only the lubricating oil passes through the bearing and penetration of foreign matter contained in the lubricating oil to the bearing is prevented by the seals.

Bearing structure with improved lubricating seals for supporting shaft

A tapered roller bearing having an inner ring and an outer ring, each respectively having of a tapered race, a plurality of tapered rollers, a cage which retains the tapered rollers at an even interval in the circumferential direction, and first and second seals. The first seal has a lip and main element, the main element being mounted on the small diameter end portion of the inner ring, and the lip being forced in the axial outward direction of the bearing against the outer ring, and separated from said outer ring when forced in the inward axial direction. The second seal has a lip and main element, the main element mounted on the large diameter end portion of the inner ring, and the lip forced in the axial inward direction of the bearing against the outer ring, and separated from said outer ring when forced in the axial outward direction. The lips of the first seal and second seal are moved and separated from the outer ring, thus creating a clearance, by a force acting in the same direction. Lubrication is accomplished by supplying lubricating oil to this bearing in the one direction, so that only the lubricating oil passes through the bearing and penetration of foreign matter contained in the lubricating oil to the bearing is prevented by the seals.

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Osaka, Japan

Masao Nunotani