Dustproof Bearing Assembly with Rotating Segmented Seal
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Solution Overview
Problem
Conventional dustproof measures in motors fail to effectively prevent dust from entering bearings, leading to non-smooth rotation and rotational noise, which shortens the service life of the bearing and motor.
Innovation Solution
A dustproof bearing assembly with a dustproof member that covers the opening of the shaft tube without gaps, having an outer diameter larger than the shaft tube, ensuring complete coverage and integration with the shaft seat to prevent dust entry and accumulation, while allowing for rotation without disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional bearing structure is used with through-holes for heat dissipation, then heat dissipation is improved, but dust enters the bearing causing non-smooth rotation and noise
Solution Approach 1:
The dustproof member is divided into multiple segments that can rotate independently, creating dynamic sealing zones between segments that adapt to the rotating shaft while maintaining dust barrier function. This segmentation allows the structure to simultaneously provide heat dissipation pathways and dust protection.
Solution Approach 2:
The dustproof member transitions from a static structure to a dynamic rotating structure that follows the shaft's rotation. The rotating segments create variable sealing gaps that prevent dust accumulation while allowing heat to dissipate, resolving the contradiction between heat dissipation and dust prevention.
2Object-affected harmful factors
If a fixed dustproof member is used to cover the bearing opening, then dust entry is reduced, but the structure cannot accommodate rotation and dust accumulates in gaps
Solution Approach 1:
The dustproof member is designed to rotate with the shaft, transforming from a static barrier to a dynamic protective structure. The rotating segments maintain sealing effectiveness while accommodating the rotational motion, eliminating dead zones where dust could accumulate.
Solution Approach 2:
The dustproof member segments are nested around the rotating shaft, with each segment capable of independent rotation. This nested configuration allows the dustproof structure to conform to the shaft's rotation while maintaining continuous dust barrier coverage.
3Object-affected harmful factors
If the dustproof member outer diameter is increased to ensure complete coverage, then dustproof effectiveness is improved, but the structure may interfere with the shaft tube
Solution Approach 1:
The dustproof member is segmented into multiple sections that can rotate independently. This segmentation allows the overall structure to have a larger effective coverage diameter for dust protection while the individual segments maintain smaller clearance with the shaft tube, avoiding interference.
Solution Approach 2:
The solution moves from a single large-diameter static barrier to multiple smaller-diameter rotating segments. The dustproof effectiveness is achieved through the collective coverage of segments arranged in a circular pattern, utilizing the rotational dimension to provide comprehensive protection without requiring excessive radial clearance.
Data Source
AI summary
A dustproof bearing assembly includes a base having a shaft tube. The shaft tube has an open end with an opening. At least one bearing is coupled to an inner periphery of the shaft tube. A rotating member includes a shaft seat. A shaft includes a first end coupled to the shaft seat and a second end extending through a shaft-receiving hole of the at least one bearing. A dustproof member includes a lower face and an upper face. The lower face is spaced from the open end of the shaft tube. The dustproof member covers the opening. The upper face of the dustproof member abuts a bottom of the shaft seat. The dustproof member has an outer diameter larger than an inner diameter of the shaft tube. The dustproof bearing assembly can be used in a motor.