Tilting Trike Axle Assembly With Virtual Pivot Wheel Lean
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Solution Overview
Problem
Existing two-wheeled vehicles lack efficient mechanisms for dynamic stability and tilting geometry that mimic the feel of a traditional bicycle, particularly when transitioning over uneven terrain.
Innovation Solution
A trike tilting axle assembly with a steering post and upper/lower axle assemblies connected by cross linkages, creating a virtual pivot point, and tilting linkage assemblies that allow wheels to lean in unison with the steering post, mimicking bicycle geometry and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tilting axle assembly is added to a trike to mimic bicycle geometry and improve dynamic stability, then the trike's balance and tracking capability are improved, but the device complexity increases
Solution Approach 1:
The tilting axle assembly is divided into distinct functional segments: an upper axle assembly that tilts with the steering post, a lower axle assembly that remains fixed, cross linkages connecting them, and tilting linkage assemblies at each wheel. This segmentation allows each component to perform its specific function while maintaining overall system manageability and reducing the complexity burden of the complete assembly.
2Stability of the object's composition
If cross linkages are designed with pivot points further apart at the upper axle assembly than at the lower axle assembly, then the load rises during tilting which biases the assembly to neutral center position, but the manufacturing precision requirements increase
Solution Approach 1:
The cross linkages are designed with specific geometric parameters where the pivot points at the upper axle assembly are positioned further apart than those at the lower axle assembly. This parameter change creates a mechanical advantage that causes the load to rise during tilting, generating a restoring force that biases the assembly back to the neutral center position. The specific dimensional relationships are carefully selected to achieve the desired stability characteristics.
3Ease of operation
If control arms connect the upper axle assembly to the tilting linkage assemblies to push or pull the linkages during tilting, then the wheels lean in sync with the steering post, but the device complexity increases
Solution Approach 1:
The control arms are integrated directly into the upper axle assembly structure, merging the steering control function with the axle support structure. This consolidation eliminates the need for separate steering mechanisms and reduces the number of independent components, thereby reducing overall device complexity while maintaining the synchronization of wheel lean with steering post movement.
Data Source
AI summary
A trike tilting axle assembly has a steering post turning an upper axle assembly. A lower axle assembly is coupled beneath the upper axle assembly by cross linkages which create a virtual pivot point for the upper axle assembly and the steering post. Tilting linkage assemblies are pivotally coupled at lower ends thereof from opposite sides of the lower axle assembly and engage respective wheel axles at upper end thereof, each of which holds a respective wheel. Control arms connect the upper axle assembly to respective upper ends of the tilting linkage assemblies. As the assembly tilts and the upper axle assembly moves sideways with respect to the lower axle assembly, the control arms push or pull the respective tilting linkage assemblies such that the wheels lean over in the same direction as the steering post whilst the assembly mimics the geometry and feel of an existing bicycle.