Eccentric Lift Roller for Aircraft Cargo Propulsion
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Solution Overview
Problem
Conventional cargo management systems face challenges in efficiently propelling cargo across aircraft decks with minimal manual assistance, as existing lift rollers often require precise alignment and assembly to function effectively, leading to potential misalignment and reduced effectiveness during operation.
Innovation Solution
The introduction of an eccentric lift roller with a dual eccentric configuration and a boss feature that ensures proper alignment and installation, allowing the power drive unit to raise and lower the drive roller for effective propulsion, preventing incorrect assembly and maintaining mechanical stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lift rollers are used, then cargo propulsion function is provided, but alignment precision and assembly correctness deteriorate
Solution Approach 1:
The patent employs asymmetric design elements including an offset channel relative to the roller axis and a boss positioned at a specific location on the hub. These asymmetric features create a unique geometric configuration that allows only one correct assembly orientation, thereby ensuring alignment precision while managing assembly complexity through intuitive design
Solution Approach 2:
The eccentric configuration with the offset channel and boss enables the lift roller to self-align during assembly. The geometric constraints inherent in the asymmetric design guide the components into proper alignment automatically, reducing the need for external alignment tools or complex assembly procedures
2Productivity
If lift roller is raised and lowered for cargo propulsion, then cargo movement efficiency improves, but mechanical stress concentration worsens
Solution Approach 1:
The patent introduces an eccentric dimension to the lift roller design, where the channel axis is offset from the roller axis. This dimensional offset creates a controlled mechanical advantage system that distributes lifting and propulsion forces more evenly across the roller structure, reducing stress concentration while maintaining cargo movement efficiency
Solution Approach 2:
The eccentric configuration changes the geometric parameters of the lift roller, creating variable leverage ratios during the raise and lower cycle. This parameter variation allows the system to optimize force distribution dynamically, reducing peak mechanical stresses on the roller and mounting structure
3Reliability
If dual eccentric configuration is implemented, then alignment and stress distribution improve, but device complexity increases
Solution Approach 1:
The dual eccentric configuration uses two asymmetric elements: the offset channel and the positioned boss. These asymmetric features work together to provide unambiguous alignment cues and mechanical constraints that ensure correct assembly, improving reliability while keeping the structural complexity manageable through design simplicity
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
The eccentric lift roller configuration enhances the power drive unit's ability to efficiently raise and lower the drive roller, ensuring effective propulsion of cargo with reduced manual assistance and minimizing assembly errors, thereby improving the overall efficiency of cargo management systems.
Implementation Method 1
The eccentric lift roller configuration enhances the power drive unit's ability to efficiently raise and lower the drive roller
Data Source
Figure 1
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Figure 2B
AI summary
A lift roller may include a hub (142) having a first surface (146), a second surface (147) opposite the first surface, and a radially outward surface (148). The hub may define a channel (155) extending through the hub from the first surface to the second surface. The lift roller may also include a rim portion (144) rotatably disposed about the radially outward surface of the hub and a boss (145) disposed on one of the first surface and the second surface.