Motor Shell Matching Surface for Bearing Slip Reduction
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Solution Overview
Problem
Existing motor rotor support systems, particularly the bearing support, are inadequate, leading to poor performance and reduced lifespan due to slippage and wear.
Innovation Solution
The motor shell design incorporates a connecting part with a matching surface that enhances the contact area with the bearing's inner ring, improving support and reducing slippage and wear by increasing flatness and eliminating the need for additional abutting members, while the shaft core is directly riveted or spot-welded for enhanced bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bearing is surrounded the shaft core to provide rotatable support, then the shaft core can rotate, but the support effect is poor leading to slippage and wear
Solution Approach 1:
The patent transitions from point or line contact to surface contact by creating a matching surface on the connecting part that abuts against the bearing's inner ring. This dimensional change from lower-dimensional contact to higher-dimensional contact significantly improves the bearing support effect and reduces slippage and wear, thereby extending service life.
Solution Approach 2:
The connecting part with the matching surface acts as an intermediary between the motor shell and the bearing. This intermediary structure provides a dedicated abutting surface that enhances the support effect, preventing direct harmful interactions between the bearing and other components, thus reducing slippage and wear.
2Reliability
If additional abutting members are added to improve bearing support, then support effect improves, but device complexity increases
Solution Approach 1:
The patent merges the abutting function into the connecting part itself by providing a matching surface on its end surface. This integration eliminates the need for separate abutting members, reducing device complexity while maintaining or improving the bearing support effect. The connecting part simultaneously performs connection and abutting functions.
Solution Approach 2:
The connecting part is designed to serve multiple functions: it connects the motor shell to the bearing and simultaneously provides the abutting surface for the bearing's inner ring. This multi-functionality reduces the number of components needed while improving the overall bearing support effect.
3Reliability
If the contact area between the matching surface and bearing inner ring is increased, then slippage and wear are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the contact interface by providing a dedicated matching surface on the connecting part that is distinct from other surfaces. This segmentation allows for focused manufacturing attention on this specific surface, making it easier to achieve the required flatness and contact area without excessively increasing overall manufacturing precision requirements for the entire component.
Data Source
AI summary
This application provides a motor shell, manufacturing method of motor shell, and electric fan. The motor shell includes an outer shell and a connecting part. The outer shell defines a holding cavity with an opening at one end of it. The connecting part extends along an axial direction of the outer shell on the holding cavity. The connecting part defines a matching surface which is at one end of the connecting part away from the bottom wall of the holding cavity. The matching surface is configured to abut against an inner ring of a bearing. A beneficial effect of this application is that a flatness of the matching surface is easier to improve, which is conducive to increasing a contact area between the matching surface and the inner ring, improving supporting effects of the bearing, reducing skids of the bearing and wears caused by the skids.