Spindle Bearing Cooling Conduits for Compact Abrading Housings

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Abrading apparatuses with rotating abrading members face challenges in effectively cooling spindle bearings, leading to increased temperatures that can cause lubricant degradation and bearing failure, especially in compact designs with multiple suction conduits that hinder air circulation around the spindle bearings.

Innovation Solution

The implementation of air conveyance conduits in the housing surrounding the spindle and spindle bearing assembly facilitates the exchange of cool air into and hot air out of the spindle bearing vicinity, utilizing the shaft balancer to enhance air circulation and cooling without the need for separate fans or oil cooling systems.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If pre-greased sealed bearings are used to simplify construction, then ease of operation and manufacturing are improved, but temperature control deteriorates leading to lubricant degradation

Engineering Contradiction:

Improvebearing assembly simplicityVSAvoidspindle bearing temperature

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The housing is segmented to include a dedicated bearing cooling chamber separated from the main housing cavity, allowing independent temperature control of the bearing assembly through dedicated cooling conduits that pass through the housing wall

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A cooling fluid (air or liquid) acts as an intermediary substance that absorbs heat from the bearing assembly through thermal conduction via the housing walls and carries it away to a heat sink or exhaust, preventing direct heat transfer to the motor and other components

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If compact housing design with multiple suction conduits is implemented, then productivity and debris collection are improved, but air circulation around bearings deteriorates

Engineering Contradiction:

Improvedebris extraction efficiencyVSAvoidspindle bearing temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The housing internal volume is segmented into functionally distinct zones: a bearing cooling chamber for thermal management, suction conduits for debris extraction, and a motor housing section, allowing each zone to perform its function independently without interfering with others

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The housing structure provides locally optimized conditions: thick insulating walls around the bearing chamber for thermal isolation, strategically placed cooling conduits for maximum heat dissipation, and suction openings positioned to capture debris without disrupting bearing cooling airflow patterns

Inventive Principle:

Principle #3Local quality

3Reliability

If bearing cooling is enhanced to prevent lubricant failure, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvebearing service lifeVSAvoidcooling system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bearing cooling function is merged with the existing housing structure and suction system, using the housing walls as heat transfer surfaces and the suction airflow to assist in removing heated air from the bearing chamber, thereby achieving cooling without separate dedicated cooling components

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system utilizes its own operational resources for cooling: the motor's rotational motion drives air circulation that passes through the bearing chamber, and the suction system's airflow helps evacuate heated air from the bearing area, eliminating the need for separate cooling fans or pumps

Inventive Principle:

Principle #25Self-service

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 solution effectively reduces spindle bearing temperatures, prolongs the lifespan of bearings and motor components, and allows for higher loads and rotational rates without additional lubrication systems, providing a simpler, more reliable, and maintenance-free cooling method.

Implementation Method 1

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 2

utilizing the shaft balancer to enhance air circulation and cooling

Methodology Applied

Scientific EffectForced Convection: Forced Convection

Implementation Method 3

the temperature of the spindle bearing(s) may increase due to heat elsewhere from the apparatus being conducted to the bearing such as from the motor via the shaft and other possible components

Methodology Applied

Scientific EffectThermal Conduction: Conduction (thermal)

Implementation Method 4

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS11638977B2Spindle bearing cooling arrangement in an abrading apparatus

Publication Date: 2023.05.02 KWH MIRKA LTD

AI summary

An arrangement for cooling a spindle bearing or bearings of an abrading apparatus with rotating abrading members is disclosed. This is premised on arranging in a housing of the abrading apparatus conduits which extend from a spindle bearing chamber wall of the housing to an inner suction chamber wall of the housing. Via such conduits, hot air may be expelled from a spindle bearing chamber of the housing as an overpressure in front of a protruding balancer element of a rotating shaft balancer is discharged from the spindle bearing chamber via a conduit into a suction chamber. Cool air may be conveyed from a suction chamber into the spindle bearing chamber as an underpressure behind the protruding balancer element draws in air from the suction chamber via the conduit to the spindle bearing chamber.