Wheel Fastening System for Direction-Precise Mobile Robot
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Solution Overview
Problem
Wheeled mobile robots experience directional imprecision and reduced productivity due to wheels failing to remain coaxial with the motor shaft during movement, leading to potential damage.
Innovation Solution
A wheel fastening system comprising a chassis, motor, wheel, thrust bearing, washer, stud, screw, and sealant, where the thrust bearing provides axial support and the washer, stud, screw, and sealant prevent radial shifting, ensuring the wheel remains coaxial with the motor shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the wheel is simply mounted on the motor shaft without additional fastening components, then the device complexity is low, but the wheel fails to remain coaxial with the motor shaft during movement, resulting in poor manufacturing precision and directional imprecision
Solution Approach 1:
The fastening system is divided into multiple functional components: thrust bearing for axial support, washer for radial positioning, stud for mechanical connection, screw for securing, and sealant for sealing. Each component addresses a specific aspect of wheel fastening, allowing the system to achieve high alignment precision through coordinated action of segmented elements rather than a single complex fastening mechanism.
Solution Approach 2:
The thrust bearing acts as an intermediary component between the wheel and motor shaft, providing axial support and maintaining proper spacing. The washer serves as an intermediary that prevents radial shifting. These intermediary elements mediate the connection between wheel and motor shaft, ensuring coaxial alignment without requiring direct rigid attachment that would increase complexity.
2Productivity
If a simple mounting method is used, then the ease of manufacture is high, but the wheel shifts radially during movement, causing directional imprecision and reduced productivity
Solution Approach 1:
The thrust bearing and washer are pre-installed on the motor shaft before mounting the wheel. This preliminary action ensures that the axial and radial positioning features are already in place, so when the wheel is attached via stud and screw, it automatically achieves correct alignment. This preliminary preparation prevents directional imprecision during operation while maintaining relatively simple assembly procedures.
Solution Approach 2:
The sealant is applied beforehand to seal gaps between components, preventing contamination and ensuring proper sealing before the wheel is fully assembled. This beforehand cushioning against potential contamination and misalignment issues ensures reliable operation and maintains productivity without requiring complex post-assembly adjustments.
3Reliability
If no axial support is provided, then the device complexity is low, but the wheel cannot maintain stable alignment with the motor shaft, resulting in directional deviation and potential damage
Solution Approach 1:
The axial support function is extracted as a separate component (thrust bearing) rather than being integrated into the motor shaft or wheel structure. This extraction allows the thrust bearing to specialize in providing axial support, ensuring stable alignment, while keeping the overall structure modular and not excessively complex. The thrust bearing takes out the specific function of axial load bearing from the general fastening system.
Solution Approach 2:
The thrust bearing performs multiple functions: it provides axial support to maintain wheel alignment, accommodates axial loads during operation, and maintains proper spacing between the wheel and motor housing. This multi-functionality achieves reliable alignment stability without requiring multiple separate components, thus avoiding excessive complexity in the support structure.
Data Source
AI summary
A wheel fastening system for a wheeled mobile robot includes a chassis, a motor, a wheel, a thrust bearing, a stud, and a screw. The chassis has a base and a cover. The cover covers the base. The motor is disposed in the chassis. The motor has a shaft. The wheel has a hub by which the wheel is centered on the shaft of the motor. The thrust bearing is an interference fit between the wheel and the chassis and provides axial support for the wheel. The stud passes through the hub of the wheel to couple to the shaft of the motor. The screw is coupled to the stud, and is clamped between the base and the cover of the chassis. The stud and the screw prevent the wheel from radially shifting relative to the shaft of the motor.