Universal Wheel Welding Shaft Assembly for Uniform Stress and Turning
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Solution Overview
Problem
Existing wheelchairs and universal wheels face issues such as non-uniform stress distribution, inaccurate turning, lack of abrasion prompts, inadequate damping structures, difficult assembly, and non-detachable designs leading to high maintenance costs and reduced service life.
Innovation Solution
A welding shaft design comprising a big wheel and small wheel welding shafts, each with specific components assembled into a whole, ensuring uniform stress distribution, accurate turning, and including abrasion prompts, along with a detachable structure for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single welding shaft is used for both big wheels and small wheels, then manufacturing is simplified, but stress distribution becomes non-uniform and turning accuracy deteriorates
Solution Approach 1:
The patent divides the welding shaft into separate big wheel welding shafts and small wheel welding shafts. Each shaft type is designed specifically for its wheel size, allowing optimized stress distribution and turning accuracy for each wheel type while maintaining independent manufacturing processes.
2Ease of manufacture
If a smooth cylindrical welding shaft is used, then manufacturing is easy, but positioning accuracy deteriorates causing non-uniform stress
Solution Approach 1:
The patent adds local positioning structures (such as positioning holes or asymmetric features) at specific locations on the welding shaft. The shaft body remains cylindrical for easy manufacturing, but these localized features provide precise positioning for fixing plates, ensuring uniform stress distribution without complicating the overall shaft structure.
3Strength
If universal wheels are made non-detachable through welding, then structural strength is improved, but maintenance capability and adaptability deteriorate
Solution Approach 1:
The patent employs detachable connection mechanisms (such as removable fixing plates, snap-fit connections, or tool-free release systems) that allow the universal wheel to transition between a securely connected state during operation and an easily separable state for maintenance. This dynamic connectivity maintains structural strength during use while enabling quick disassembly for part replacement or repairs.
4Device complexity
If no damping structure is provided, then device complexity is reduced, but comfort and service life deteriorate due to impact forces
Solution Approach 1:
The patent incorporates damping structures (such as rubber buffers, elastic elements, or shock-absorbing materials) positioned at critical connection points within the universal wheel assembly. These structures are pre-installed to absorb impact forces and reduce vibrations before they can damage structural components, thereby extending service life and improving comfort without significantly increasing overall device complexity.
Data Source
AI summary
The welding shaft for a universal wheel includes a big wheel welding shaft and a small wheel welding shaft, wherein the big wheel welding shaft includes a big wheel welding shaft body, a big wheel welding shaft retainer ring and a big wheel welding shaft fixing head which are sequentially assembled into a whole. The small wheel welding shaft includes a small wheel welding shaft body, a small wheel welding shaft retainer ring and a small wheel welding shaft fixing head which are sequentially assembled into a whole. The wheel assembly for a universal wheel includes a wheel shaft fixing plate, the welding shaft, a big wheel, and a small wheel. The universal wheel includes an outer protection plate, an outer fixing plate, a wheel shaft drive connector, multiple wheel assemblies, an inner fixing plate, an inner protection plate, and multiple shock absorption assemblies.