Protective Flange Pulley Structure for Bearing Contamination Control
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Solution Overview
Problem
Pulley devices for tensioner and winding rollers face issues with pollution accumulation, leading to accelerated deterioration of internal components and reduced service life due to worn sealing means allowing contaminants to enter the bearing chamber.
Innovation Solution
A pulley device design featuring a protective flange with a circumferential trough that collects contaminants away from the bearing seals, reducing the risk of pollution entering the chamber, and a compact axial and radial space configuration for ease of mounting and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sealing means are added to close the bearing chamber, then pollution entry is reduced, but pollution accumulates near the sealing means and accelerates deterioration
Solution Approach 1:
The patent extracts the harmful accumulated pollution from the bearing vicinity by creating a dedicated collection zone (the depression in the protective flange) that isolates contaminants away from the bearing seals and components, thereby maintaining reliability while still providing sealing
Solution Approach 2:
The protective flange with its depression acts as an intermediary structure between the external environment and the bearing chamber, capturing pollutants in the depression before they can reach the bearing seals, thus protecting the bearing components without compromising sealing effectiveness
2Object-affected harmful factors
If protective flange is added to protect from contaminants, then protection is improved, but device complexity increases
Solution Approach 1:
The protective flange is designed to serve multiple functions: it protects the bearing from contaminants, provides a thrust washer for the screw head, and incorporates a depression to collect and isolate accumulated pollution. By combining these functions into a single component, the patent improves protection without significantly increasing device complexity
Data Source
AI summary
A pulley device for a tensioner roller or winding roller of a transmission element, having a pulley, a bearing, and an annular protective flange. The flange provides a first radial portion of small diameter, the first radial portion bearing against a fixed inner ring of the bearing, a second radial portion of large diameter, and a substantially axial intermediate portion connecting the first and second radial portions. The intermediate portion forms a circumferential trough, the bottom of which is offset radially towards the inside of the pulley device compared with the outer edge of the fixed inner ring.