Self-Aligning Tapered Roller Bearing in a One-Piece Housing

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Solution Overview

Problem

Conventional self-aligning tapered roller bearing assemblies with split housings are costly to manufacture and lack structural integrity compared to one-piece housings, while ball bearings with specific shape factors require complex assembly orientations.

Innovation Solution

A self-aligning tapered roller bearing assembly with an integral, non-split housing featuring a concave spherical support surface and convex spherical cogs on the outer ring, allowing for misalignment tolerance and simplified assembly by aligning cogs with cutouts in the housing receptacle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a two-piece housing is used to assemble the bearing cartridge, then the bearing can be installed with misalignment tolerance, but the manufacturing cost increases and structural integrity decreases

Engineering Contradiction:

Improvemisalignment toleranceVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The spherical support surface is segmented into multiple discrete spherical seats arranged circumferentially around the bearing receptacle. These seats are spaced apart to allow the bearing outer ring to be inserted axially without requiring the housing to be split. The segmentation provides misalignment accommodation while maintaining an integral housing structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The spherical seats are nested within the integral housing structure, with each seat providing a localized spherical support point. The bearing outer ring's spherical outer surface nests within these seats, allowing the bearing to self-align while the housing remains a single integrated piece.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If a two-piece housing is used to assemble the bearing cartridge, then the bearing can be installed with misalignment tolerance, but the structural integrity and strength of the housing decreases

Engineering Contradiction:

Improvemisalignment toleranceVSAvoidhousing strength

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The spherical support function is segmented into multiple discrete seats rather than requiring a split housing. This segmentation allows the housing to remain integral and strong while still providing the necessary misalignment tolerance through the distributed spherical support points.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The spherical support surface is merged into the integral housing structure as fixed spherical seats. This combining eliminates the need for separate housing pieces while maintaining the self-aligning capability, thereby preserving housing strength and structural integrity.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If conventional ball bearings with specific shape factors are used, then the bearing can be inserted into a one-piece housing, but the assembly requires complex orientation with loading slots and reorientation steps

Engineering Contradiction:

Improveone-piece housingVSAvoidassembly complexity

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The bearing outer ring is provided with a spherical outer surface and the housing contains spherical seats, creating a spherical interface that eliminates the need for complex orientation. The spherical geometry allows the bearing to be inserted in any rotational orientation and will self-align to the correct position, eliminating loading slots and reorientation steps.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The spherical interface between the bearing outer ring and housing seats provides self-aligning capability, allowing the bearing to automatically orient itself during assembly. This self-service mechanism eliminates the need for operator intervention to achieve proper alignment, simplifying the assembly process while using a one-piece housing.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250297641A1Self-aligning tapered roller bearing assembly with non-split housing

Publication Date: 2025.09.25 THE TIMKEN CO(US)

AI summary

A self-aligning tapered roller bearing assembly includes an outer ring, an inner ring, a plurality of rolling elements, and a housing. The plurality of rolling elements are situated to provide a rolling interface between the outer ring and the inner ring about a central bearing axis. The plurality of rolling elements are situated in multiple rows along the central bearing axis. The housing has an interior bearing receptacle defining a central housing axis and including a concave spherical support surface configured to tolerate misalignment between the central bearing axis and the central housing axis about a central point. An outside surface of the outer ring includes, at a central axial position thereof, a plurality of circumferentially-spaced convex spherical cogs. The housing is not split, such that the interior bearing receptacle is integral and not separable.