Inline Skate Wheel Hub Layout for Durability and Acceleration
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Solution Overview
Problem
Traditional inline skate wheels are either too hard, which makes them durable but sacrifices acceleration, or too soft, which provides better grip but wears out quickly, necessitating a balance between durability and performance.
Innovation Solution
A wheel assembly apparatus with a coaxially positioned wheel hub, laterally opposed bearings, and outer and inner spacers that allow for a smaller bearing gap and external spacer placement, enabling easier assembly and improved flexibility, allowing the wheel to rotate and wear better.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If harder wheel material is used, then durability is improved, but acceleration performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the bearing gap dimension (0.003-0.010 inches) and using specific Shore hardness ranges (78A-93A) to optimize the balance between durability and acceleration performance. This quantitative parameter optimization allows softer wheels to maintain durability while improving acceleration.
2Speed
If softer wheel material is used, then acceleration performance is improved, but durability deteriorates
Solution Approach 1:
The patent changes the material parameter by specifying polyurethane with Shore hardness of 78A-93A, which is softer than traditional wheels but compensates through optimized bearing gap (0.003-0.010 inches) and outer spacer configuration, achieving both acceleration and durability.
Solution Approach 2:
The patent applies local quality by positioning outer spacers at specific locations (contacting outwardly facing lateral surfaces of bearings) to provide localized support and load distribution, allowing softer material to maintain durability in high-stress areas while retaining flexibility elsewhere.
3Ease of manufacture
If traditional bearing configuration is used, then assembly is simplified, but wheel flexibility and performance deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the wheel assembly into distinct modular components: wheel hub, bearings, outer spacers, and axle. This modular segmentation enables independent optimization of each component while maintaining ease of assembly through standardized interfaces.
Solution Approach 2:
The patent introduces outer spacers as intermediary elements between the bearings and the wheel hub exterior. These spacers mediate the load transfer and provide precise positioning, enabling improved flexibility and performance without complicating the assembly process.
Data Source
AI summary
A wheel assembly apparatus is disclosed. In at least one embodiment, a wheel hub is coaxially positionable within a wheel. A first bearing and a laterally opposed second bearing are each positionable coaxially within the wheel hub, with an inner race of the first bearing being laterally spaced apart from an opposing inner race of the second bearing so as to form a bearing gap therebetween. A first outer spacer is positionable in contact with an outer race of the first bearing, and a second outer spacer is positionable in contact with an outer race of the second bearing. Accordingly, an axle is capable of extending coaxially through each of the first outer spacer, first bearing, second bearing, second outer spacer, wheel hub and wheel, thereby enabling the wheel to rotate about the axle.