Sealed Roller Shaft With Thrust And Radial Load Distribution

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Solution Overview

Problem

The existing roller systems face reduced durability due to biased vertical loads and lateral thrusting, which lead to eccentricity and poor drivability, primarily because the thrust and radial members are not effectively sealed, allowing foreign materials and moisture to degrade the lubricant film and concentrate loads, causing friction and tilting issues.

Innovation Solution

The roller system is redesigned with a sealed structure where the thrust member is installed at the upper part of the rotational shaft, and the radial member is positioned on the inner surfaces to absorb and disperse loads, using various bearing types and a shield panel to prevent foreign materials from entering, ensuring uniform load distribution and minimizing lateral thrusting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the thrust bearing and inclined surface rolling wheel are coupled with exposed outer diameters of races, then the structure allows easy assembly and access, but the bearing cannot be completely sealed allowing foreign materials and moisture to degrade the lubricant film

Engineering Contradiction:

Improveease of assemblyVSAvoiddurability of bearing

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A seal ring is introduced to create a sealed structure around the thrust bearing, preventing foreign materials and moisture from entering the bearing space. The seal ring forms a protective barrier that maintains the lubricant film integrity while allowing the bearing to function properly.

Inventive Principle:

Principle #30Flexible shells and thin films

2Ease of operation

If the upper and lower races maintain a minute gap with oil film, then the thrust bearing operates smoothly, but the oil film breaks due to oxidation and foreign material intrusion causing direct contact between balls/rollers and races

Engineering Contradiction:

Improvesmooth operation of bearingVSAvoidintegrity of lubricant film

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The seal ring creates a protected environment around the thrust bearing, isolating the lubricant film from external contaminants and moisture that cause oxidation. This sealed environment preserves the lubricant properties and maintains the oil film integrity during operation.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The seal ring is installed beforehand to prevent foreign materials and moisture from entering the bearing space, providing proactive protection against oil film breakdown before it can occur during operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Stability of the object's composition

If the rotational shaft is tilted due to lateral thrusting, then the lower race droops and maintains gap, but the drivability and rollability are compromised due to concentrated load on balls/rollers

Engineering Contradiction:

Improvemaintenance of gap between racesVSAvoiddrivability and rollability

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The radial bearing is positioned to act in advance against lateral thrusting forces, preventing the rotational shaft from tilting before the tilt can occur. This proactive support maintains the proper orientation of the thrust bearing and ensures even load distribution.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration enhances the durability and drivability of the roller by minimizing lateral thrusting and eccentricity, maintaining a stable lubricant film, and uniformly distributing loads, thus preventing the degradation of the thrust and radial members.

Implementation Method 1

a radial member 140 is installed on inner surfaces of the rotational shaft 112 and a coupling groove 122 positioned at the lower part of the thrust member 150 to support a radial load

Methodology Applied

Scientific EffectRolling contact: Ball Bearing

Implementation Method 2

a thrust member 150 is installed at the upper part of the rotational shaft 112 to allow a thrust load to concentrate on the top of the rotational shaft 112 or the thrust member 150

Methodology Applied

Scientific EffectRolling contact bearing: Ball Bearing

Implementation Method 3

using various bearing types and a shield panel to prevent foreign materials from entering, ensuring uniform load distribution

Methodology Applied

Scientific EffectPhysical barrier: Filter (physical)

Data Source

PatentUS10072449B2Roller

Publication Date: 2018.09.11 JANG HYUK SOO

AI summary

Provided is a roller, and more particularly, to a rotary shaft of the upper part of a rolling wheel, having an inclined surface formed along the circumference of an outer diametral surface thereof, is inserted into at least one coupling groove formed on a transfer bracket, a thrust member is provided at the upper part of the rotary shaft so as to allow a thrust load to be concentrated on the upper end of the rotary shaft or the thrust member, and a radial member is provided at the inner surface of the coupling groove and the rotary shaft positioned at the lower part of the thrust member, thereby supporting a radial load.