Dual Wheel Drive Assembly Maneuverability and Surface Protection
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Solution Overview
Problem
Current self-propelled wheel assemblies for small-scale devices face limitations in maneuverability, degrees of freedom, and surface interaction, leading to inadequate mobility and potential damage to surfaces due to scuffing, as they are either insufficiently powered or designed for large-scale applications.
Innovation Solution
A dual-wheel self-propelled wheel assembly with two drive motors and an orientation motor, allowing independent wheel control and pivotability, along with a height adjustment mechanism and compliant load sensing, to enhance mobility and reduce surface contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If small-scale devices use simple two-wheel drive systems with caster wheels, then the device complexity is reduced, but the maneuverability and control precision deteriorate
Solution Approach 1:
The wheel assembly is segmented into multiple independent wheels (at least two wheels instead of one), each capable of independent rotation and steering. This segmentation allows the system to achieve complex maneuvers without requiring a complex overall structure, as each wheel can be controlled independently to produce desired motion patterns.
Solution Approach 2:
The wheel assembly incorporates dynamic control capabilities where the rotation speed and steering angle of each wheel can be independently adjusted in real-time. This dynamic control enables the system to adapt to different maneuvering requirements, transitioning between straight-line motion, turning, and pivoting as needed.
2Length of moving object
If small-scale devices use wheels with small contact area, then the device size is reduced, but the surface damage increases due to scuffing
Solution Approach 1:
The load-bearing function is segmented across multiple wheels instead of concentrating it on a single small wheel. This distribution of load across multiple contact points reduces the pressure on each individual wheel, minimizing surface damage while maintaining compact device dimensions.
Solution Approach 2:
The wheel assembly is designed to operate in multiple degrees of freedom, including vertical adjustment capability. This allows the wheels to maintain optimal contact with the surface while accommodating variations in terrain and load, preventing scuffing through controlled engagement rather than fixed rigid contact.
3Power
If large-scale machines use direct-drive motors in wheel hubs, then the power output is increased, but the device complexity and size increase
Solution Approach 1:
Multiple wheel functions (driving, steering, load-bearing, and height adjustment) are merged into a single integrated wheel assembly unit. This consolidation achieves the functional complexity of large-scale systems while maintaining the compact form factor suitable for small-scale devices.
Solution Approach 2:
The wheel assembly is designed as a multi-functional unit that performs driving, steering, suspension, and height adjustment functions simultaneously. This universality eliminates the need for separate mechanisms for each function, reducing overall system complexity while maintaining the capabilities of more complex systems.
4Device complexity
If small-scale devices use fixed height wheel assemblies, then the device complexity is reduced, but the adaptability to varying loads deteriorates
Solution Approach 1:
The wheel assembly incorporates dynamic height adjustment capability, allowing the vertical position of the wheels to be changed in response to varying loads and terrain conditions. This dynamic adaptability enables the system to maintain optimal performance across different operating conditions without requiring a completely redesigned system.
Solution Approach 2:
The system can change the vertical position parameter of the wheel assembly to adapt to different load conditions. By adjusting this single parameter, the system maintains stability and performance across a range of loads without increasing overall structural complexity.
Data Source
AI summary
A wheel assembly for a small-scale machine includes a pair of opposing, individually-driven wheels, associated motors and possibly one or more gear assemblies. The motors receive separate drive signals from a control electronics subsystem of the wheel assembly. The motors can be connected to the wheels via the gear assemblies. Because the wheels are separately driven, driving the two wheel assemblies at similar or different speeds drives the wheel assembly over straight or curved paths. An orientation assembly allows the orientation of the wheels to the machine to be controllably altered. A height adjusting assembly allows the distance between the wheels and a point on the machine where the wheel assembly is attached to be adjusted. The rotational axis that the wheel assembly rotates about when re-oriented need not pass through either wheel of the wheel assembly. The wheels can be driven by control signals generated by on-board control electronics.