Frictional Drive Traction Wheel with Articulated Roller Loop
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Solution Overview
Problem
Conventional omni-directional vehicle traction wheels are costly to manufacture and require complex construction, with stiffness issues affecting traction and engagement efficiency, limiting lateral movement and increasing frictional resistance.
Innovation Solution
A friction drive device with a traction wheel featuring articulation members connected in a loop, supporting free rollers without a stiff annular member, allowing adjustable articulation angles to optimize engagement and reduce friction, and using fewer components to lower manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stiff annular member is used to support free rollers, then structural stability is improved, but lateral traction is limited because only the lowermost free roller engages the road surface
Solution Approach 1:
The annular member is designed with elastic properties rather than being completely stiff, allowing it to dynamically deform under load. This enables multiple free rollers to simultaneously engage with the road surface, increasing lateral traction while maintaining sufficient structural stability through controlled elasticity.
Solution Approach 2:
The stiffness parameter of the annular member is optimized to a specific range that balances structural stability and lateral traction. By adjusting the elastic modulus and geometric parameters of the annular member, the design achieves optimal performance where the structure remains stable yet flexible enough to allow multiple rollers to contact the ground.
2Force
If the annular member is made elastic to allow multiple free rollers to engage the road surface, then lateral traction is improved, but adjoining free rollers may become axially aligned and prevent favorable engagement with drive rollers
Solution Approach 1:
The elastic modulus and geometric dimensions of the annular member are precisely controlled to achieve optimal deformation characteristics. This ensures that when the annular member deforms to allow multiple roller engagement, the free rollers maintain proper angular orientation relative to the drive rollers, preventing axial alignment and ensuring favorable engagement.
Solution Approach 2:
Different sections of the annular member may have different elastic properties or geometric characteristics to locally control the deformation behavior. This allows specific regions to deform in a way that maintains proper roller alignment while still enabling multiple engagement points, thus preserving engagement efficiency while improving lateral traction.
3Force
If the stiffness of the annular member is reduced to allow multiple roller engagement, then lateral traction is improved, but free rollers may interfere with each other and performance deteriorates
Solution Approach 1:
The stiffness parameters of the annular member are optimized to a specific range that prevents excessive deformation. This controlled stiffness ensures that while enough flexibility exists to allow multiple rollers to engage the road surface, the deformation remains within limits that prevent free rollers from interfering with each other, thus maintaining reliable engagement.
Solution Approach 2:
The annular member's elastic properties act as a cushioning mechanism that pre-controls the deformation behavior under various loading conditions. This beforehand-designed elastic response prevents roller interference by limiting maximum deformation, ensuring reliable operation across different terrain and load conditions while still enabling improved lateral traction.
4Stability of the object's composition
If conventional omni-wheel construction with stiff annular member and sleeve members is used, then structural stability is maintained, but manufacturing cost and complexity increase
Solution Approach 1:
The invention merges the functions of the annular member and sleeve members into a single integrated elastic annular member structure. This eliminates the need for separate sleeve components and complex assembly operations, significantly reducing manufacturing cost and complexity while maintaining structural stability through the elastic design.
Solution Approach 2:
The invention extracts and eliminates the stiff annular member and separate sleeve members from the conventional design, replacing them with a single elastic annular member that performs both structural support and roller positioning functions. This simplification reduces component count, manufacturing steps, and overall cost while achieving the required structural stability.
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 solution enhances lateral traction, minimizes frictional resistance, and reduces manufacturing costs by simplifying the component structure and allowing adjustable articulation for optimal engagement, thereby improving the overall performance of the traction wheel.
Implementation Method 1
The traction wheel includes a plurality of articulation members pivotally connected in tandem into a loop, and a free roller rotatably supported by each articulation member... allowing adjustable articulation angles to optimize engagement and reduce friction
Implementation Method 2
a plurality of drive rollers pivotally supported along a peripheral part of each drive disk at a substantially regular angular interval and engaging the free rollers at an oblique angle... the driven rollers are frictionally driven by the drive rollers
Data Source
AI summary
A friction drive device comprises a pair of drive disks rotatably supported by a frame opposite to each other in a coaxial relationship, a power source for individually rotatively actuating the drive disks, a traction wheel interposed between the drive disks and including a plurality of articulation members pivotally connected in tandem into a loop and a free roller rotatably support by each articulation member so as to be rotatable around an axial line extending along the loop, and drive rollers pivotally supported along a peripheral part of each drive disk at a regular angular interval and engaging the free rollers at an oblique angle. The articulation members allow the free rollers to be held in a loop without requiring a stiff annular member.