Wheel Hub Bearing Removal by Rotational Heating Expansion

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for removing and replacing wheel bearings are inefficient and often damage the wheel hub, requiring brute force or destructive techniques to separate the inner race from the hub, posing risks of damage to the hub assembly.

Innovation Solution

A tool comprising a base and a rotatable top with a tapered cone, where the wheel hub is secured and heated to expand the inner race, allowing easy separation without damaging the hub, using a press-fit bearing connection for assembly and rotation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If brute force methods (hammer, mallet, chisel) are used to separate the inner race from the wheel hub, then the separation force is sufficient to remove the bearing, but the wheel hub may be damaged or scored

Engineering Contradiction:

Improveseparation forceVSAvoidhub damage

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The patent applies thermal energy to change the temperature parameter of the inner race, causing thermal expansion that increases the inner race diameter. This parameter change allows the inner race to be expanded beyond its interference fit dimensions, enabling removal without applying damaging mechanical forces to the hub

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent directly utilizes thermal expansion by heating the inner race with a heat source (torch, heater, or induction heating device). The thermal expansion increases the inner race diameter, breaking the interference fit with the hub and allowing removal without damage

Inventive Principle:

Principle #37Thermal expansion

2Ease of operation

If metal fingers are used to grip and hammer the race off, then the bearing can be removed, but the hub assembly surface may be damaged or scored

Engineering Contradiction:

Improvebearing removalVSAvoidhub surface damage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical hammering system with a thermal energy system. Instead of using metal fingers to grip and hammer the race, the invention uses heat sources (torch, heater, or induction heating) to thermally expand the inner race, eliminating the need for impact forces that could damage the hub surface

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Force

If a blunt chisel bit is used to force the piece off, then the bearing can be separated, but the hub assembly surface may be damaged

Engineering Contradiction:

Improveseparation forceVSAvoidhub surface scoring

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The patent substitutes the mechanical chisel-based separation system with a thermal expansion system. By heating the inner race to expand it beyond its interference fit dimensions, the invention eliminates the need for chisels that could score or damage the hub assembly surface

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Productivity

If the inner race is cut off to remove it, then the bearing can be separated, but the hub assembly is damaged and the process is destructive

Engineering Contradiction:

Improvebearing replacement speedVSAvoidhub damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful interference fit (which prevents removal) into a beneficial condition by using thermal expansion. The heat causes the inner race to expand beyond its fitted dimensions, transforming the tight fit that causes removal difficulty into an expanded state that enables easy, non-destructive removal

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Enables quick and safe separation of wheel hub components without damaging the hub, reducing noise and time, allowing for efficient replacement of wheel bearings.

Implementation Method 1

a heat source may be applied to a portion of the wheel hub to separate a first wheel hub piece from a second wheel hub piece

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

The bearing may allow the top to be rotated relative to the bottom

Methodology Applied

Scientific EffectRolling contact: Roller

Data Source

PatentUS11364607B2Bearing removal tool

Publication Date: 2022.06.21 YERGESMFG LLC

AI summary

The present invention relates to a tool for expediting the separation of different components of a wheel hub. The tool includes a base and a top that is rotatably connected to the base. The tool may also include a bearing that is connected to the base and to the top, where the bearing enables the rotation of the top relative to the base. A portion of a wheel hub may be located relative to the top, after which the wheel hub and top can be rotated. While this occurs, a heat source can be applied to a portion of the wheel hub to enable even heating. As a result of this heating and related expansion, a first wheel hub piece may be separated from a second wheel hub piece.