Outer-Ring Flanged Tapered Roller Bearing for Axial Load Capacity
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Solution Overview
Problem
Tapered roller bearings with a flange portion at the large-diameter end of the outer ring track surface have a significantly reduced pure axial load capacity compared to those with a flange portion at the large-diameter end of the inner ring track surface.
Innovation Solution
A tapered roller bearing design featuring a flange portion that radially inwardly protrudes only at the large-diameter end of the outer ring track surface, combined with a contact angle of 40 to 50° and a roller angle not greater than 3.5°, to maintain high moment stiffness and long life without compromising axial load capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flange portion is formed at the large-diameter end of the outer ring track surface, then the bearing structure is simplified and manufacturing is easier, but the pure axial load capacity is extremely decreased
Solution Approach 1:
The patent applies parameter changes by precisely controlling the contact angle (40-50 degrees) and roller angle (not greater than 3.5 degrees) to compensate for the loss of axial load capacity caused by moving the flange to the outer ring. This parameter optimization allows the bearing to maintain adequate axial load capacity while achieving the manufacturing advantages of the outer-ring-flange configuration.
2Reliability
If a flange portion is formed at the large-diameter end of the outer ring track surface, then the bearing can provide high moment stiffness and long life, but the pure axial load capacity is extremely decreased
Solution Approach 1:
The patent resolves this contradiction by optimizing the contact angle to 40-50 degrees and roller angle to not greater than 3.5 degrees. These parameter changes enable the bearing to achieve high moment stiffness and long life while maintaining adequate pure axial load capacity, despite the flange being positioned on the outer ring rather than the inner ring.
Data Source
AI summary
An object of the present invention to provide a tapered roller bearing in which a flange portion is formed at a large-diameter end of an outer ring track surface of an outer ring, capable of providing high moment stiffness and long life without extremely decreasing its pure axial load capacity. The tapered roller bearing comprising: an outer ring 12 having an outer ring track surface 12a on its inner circumferential surface; an inner ring 13 having an inner ring track surface 13a on its outer circumferential surface; a plurality of tapered rollers 14 rotatably disposed between the outer ring track surface 12a and the inner ring track surface 13a; and a retainer 15 having a plurality of pockets for retaining the plurality of tapered rollers 14 at a predetermined interval; the outer ring track surface 12a of the outer ring 12 having a small-diameter end and a large-diameter end, the inner ring track surface 13a of the inner ring 13 having a small-diameter end and a large-diameter end, and, of these four ends, a flange portion 12b that protrudes radially inwardly is formed at the large-diameter end of the outer ring track surface 12a of the outer ring 12; wherein the tapered roller bearing has a contact angle greater than 35° and a roller angle not greater than 3.5°.