Deep Groove Ball Bearing Structure for High-Speed Motor Rigidity
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Solution Overview
Problem
Deep groove ball bearings designed for maximum rolling element size compromise rigidity, stability, and performance in high-speed motor applications, leading to issues like creep, wear, and premature failure due to insufficient axial and radial rigidity.
Innovation Solution
A deep groove ball bearing design using smaller-sized rolling elements with a diameter not exceeding 50% of the bearing's radial thickness, combined with a thicker outer ring and a more robust cage structure, to enhance axial and radial rigidity, reduce creep and wear, and improve rotational accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the rolling element diameter is maximized to reduce contact stress and extend fatigue life, then the fatigue life is improved, but the bearing rigidity deteriorates due to reduced radial thickness and fewer rolling elements
Solution Approach 1:
The patent changes the key parameter of rolling element diameter from maximum size to a controlled size range (0.08D to 0.12D), where D is the bearing outer diameter. This parameter optimization balances contact stress reduction with rigidity maintenance, allowing sufficient rolling elements to be accommodated while ensuring adequate radial thickness for structural strength.
Solution Approach 2:
Instead of using the maximum possible rolling element size, the patent deliberately uses smaller rolling elements than traditionally designed. This partial action approach allows more rolling elements to be fitted into the bearing, creating a redundant support system that enhances rigidity while still providing adequate load distribution to maintain fatigue life.
2Stress or pressure
If larger rolling elements are used to minimize contact stress, then the contact stress is reduced, but the number of rolling elements that can be fitted decreases, reducing intensive support capability
Solution Approach 1:
The patent uses smaller rolling elements than the maximum possible size, creating an excessive number of rolling elements relative to traditional designs. This ensures adequate load distribution across more contact points while maintaining individual contact stress within acceptable limits, achieving both stress control and intensive support.
Solution Approach 2:
The bearing load support function is segmented into multiple smaller rolling elements rather than fewer larger ones. This segmentation distributes the support function across more discrete elements, increasing the intensive support capability and reducing the circumferential spacing between rolling elements for more uniform load distribution.
3Strength
If more rolling elements are accommodated by reducing their size, then the bearing rigidity is enhanced, but the load capacity redundancy increases
Solution Approach 1:
The patent optimizes the rolling element diameter parameter to a specific range (0.08D to 0.12D) that achieves the right balance between rigidity enhancement and load capacity efficiency. This parameter change ensures that while more rolling elements provide rigidity, their size remains sufficient to maintain effective load carrying capacity without excessive redundancy.
Data Source
AI summary
A deep groove ball bearing having an inner ring, an outer ring and a plurality of rolling elements set between the inner and outer rings. The rolling elements have a diameter DW≤0.5H1, up to DW≤0.35H1. H1 is the radial dimension of the bearing in the sense of thickness and is numerically equal to half of the difference between the outer diameter and inner diameter of the bearing.