Adjustable Bearing Spacer With Hardened Ends to Prevent Bearing Crawl

Solution Overview

Problem

Bearing crawl in shaft-mounted bearings leads to excessive and premature wear, and existing adjustable spacers may exacerbate this issue, especially when dealing with bearings of different diameters on variable diameter shafts.

Innovation Solution

An adjustable spacer with a ring configuration, featuring hardened end portions and a deformable intermediate portion made of non-hardened material, is designed to be mounted between roller bearings on a shaft. The hardened ends resist wear and maintain axial force, while the deformable intermediate portion compresses to prevent bearing crawl.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a hardened adjustable spacer is used to resist wear at bearing contact areas, then wear resistance is improved, but the spacer becomes less deformable and cannot adequately prevent bearing crawl

Engineering Contradiction:

Improvewear resistanceVSAvoiddeformability

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The spacer is constructed with different material properties at different locations: the end portions contacting the bearings are made of hardened material for wear resistance, while the intermediate portion is made of softer, more deformable material to prevent bearing crawl. This local differentiation of material properties resolves the contradiction between wear resistance and deformability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The spacer uses a composite construction combining hardened material and softer material in a single component. The hardened end portions provide wear resistance at contact surfaces, while the softer intermediate portion provides the necessary deformability to maintain bearing position and prevent crawl, achieving both requirements simultaneously.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If the entire spacer is made of deformable material to prevent bearing crawl, then adaptability is improved, but wear resistance at contact areas deteriorates

Engineering Contradiction:

ImprovedeformabilityVSAvoidwear resistance

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The spacer is constructed with different material properties at different locations: the end portions contacting the bearings are made of hardened material for wear resistance, while the intermediate portion is made of softer, more deformable material to prevent bearing crawl. This local differentiation of material properties resolves the contradiction between wear resistance and deformability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The spacer uses a composite construction combining hardened material and softer material in a single component. The hardened end portions provide wear resistance at contact surfaces, while the softer intermediate portion provides the necessary deformability to maintain bearing position and prevent crawl, achieving both requirements simultaneously.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If a single-material spacer is used to simplify manufacturing, then ease of manufacture is improved, but the ability to simultaneously provide wear resistance and deformability deteriorates

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoiddual functionality

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The spacer uses a composite construction combining hardened material and softer material in a single component. The hardened end portions provide wear resistance at contact surfaces, while the softer intermediate portion provides the necessary deformability to maintain bearing position and prevent crawl, achieving both requirements simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The spacer is divided into distinct functional segments: hardened end portions for wear resistance and a softer intermediate portion for deformability. This segmentation allows each region to be optimized for its specific function while maintaining ease of manufacture through techniques like selective hardening or assembling pre-fabricated sections.

Inventive Principle:

Principle #1Segmentation

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

The adjustable spacer effectively minimizes bearing crawl and wear by maintaining axial force and resisting rotational torque, while its deformable intermediate portion allows for adjustment to maintain desired endplay and preload on the bearings.

Implementation Method 1

The first end portion and second end portion include a hardened material

Methodology Applied

Scientific EffectHardening: Heat Treatment

Implementation Method 2

The intermediate portion comprises a non-hardened material and is more deformable than that first end portion and second end portion

Methodology Applied

Scientific EffectDeformation: Deformation

Data Source

PatentUS12292083B2Adjustable spacer with hardened ends

Publication Date: 2025.05.06 TEMPER CORP

AI summary

An adjustable spacer with a non-hardened intermediate portion therebetween is mountable between a pair of roller bearings also mounted on a shaft such an axle or spindle or the like. The intermediate portion allows the spacer to collapse in the axial direction to maintain desired axial loads on the bearings.