Roller Bearing Cage Concave Support Surfaces

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Solution Overview

Problem

Traditional needle roller bearing cages face challenges with varying roller drop due to pocket width, leading to reduced retention and guidance of rollers, necessitating precise manufacturing techniques that increase costs.

Innovation Solution

The design incorporates radially outward facing concave roller support surfaces on the pillars, reducing the variation in roller drop as a function of pocket width, allowing for less precise manufacturing tolerances while maintaining effective retention and guidance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional flat roller support surfaces are used in the cage pockets, then the manufacturing process is simple, but the roller drop varies greatly with pocket width, leading to poor roller retention and guidance

Engineering Contradiction:

Improveroller drop consistencyVSAvoidmanufacturing complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent applies curvature by forming concave spherical surfaces on the roller support surfaces of the cage pockets. This curvature allows the roller to self-center within the pocket, maintaining consistent roller drop and proper alignment regardless of pocket width variations. The spherical geometry naturally guides the roller to the correct position, eliminating the need for high-precision flat surface manufacturing.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Reliability

If precise manufacturing techniques are used to minimize roller drop variation, then roller retention and guidance are maintained, but manufacturing cost increases

Engineering Contradiction:

Improveroller retentionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The concave spherical support surfaces provide inherent roller centering and retention functionality. The curved geometry ensures that rollers remain properly positioned and retained in the pockets even with wider manufacturing tolerances, maintaining reliability without requiring costly precision manufacturing techniques.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Reliability

If precise manufacturing techniques are used to maintain roller guidance, then roller alignment is maintained, but manufacturing cost increases

Engineering Contradiction:

Improveroller guidanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The spherical concave surfaces provide self-aligning geometry that naturally guides rollers to the correct orientation and position. This inherent guidance functionality is achieved through the curved surface geometry rather than through precision-controlled flat surfaces, reducing manufacturing costs while maintaining reliable roller guidance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS9033587B1Cage for a roller bearing and a method of manufacturing the same

Publication Date: 2015.05.19 ROLLER BEARING OF AMERICA INC

AI summary

A cage for a roller bearing includes a first annular portion and a second annular portion opposite the first annular portion and a plurality of pillars interconnecting the first annular portion and the second annular portion. Adjacent pairs of the pillars each define a pocket for holding rollers. Each of the pockets is configured to receive at least one roller. One or more radially outward facing concave roller support surface is formed in one or more of the pillars at a position proximate a radially outer edge of the pillar. The concave roller support surface is configured to radially outwardly support a portion of one of the rollers.