Three-Wheel Lean Control Shaft for High-Speed Cornering Stability
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Solution Overview
Problem
Three-wheel vehicles, or trikes, are notoriously unstable and have poor turning capabilities due to the inability to lean into turns, leading to dangerous situations when cornering at high speeds.
Innovation Solution
A three-wheel vehicle design featuring a chassis with a rotational control shaft oriented along a path from the front to the rear, equipped with a front wheel assembly that includes lean control motors and a worm drive gear assembly, allowing the chassis to lean from side to side, and a lean control system that adjusts the vehicle's orientation based on detected forces to improve handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a complex system with sensors and front beam assembly is used to enable leaning, then cornering ability is improved, but device complexity increases significantly
Solution Approach 1:
The patent extracts the leaning function from a complex multi-component system and implements it through a single rotational control shaft that rotates the entire front wheel assembly and chassis together. This simplifies the structure by removing the need for separate A-arms, U-shaped contacting surfaces, and multiple sensors while achieving the same cornering improvement through whole-assembly rotation rather than individual component coordination.
Solution Approach 2:
The patent merges the steering and leaning functions into a single rotational control shaft mechanism. By combining what were previously separate functions (steering via A-arms and leaning via complex beam assembly) into one integrated rotation axis, the system achieves both functions simultaneously with reduced complexity.
2Stability of the object's composition
If the front wheels are leaned using A-arms and U-shaped contacting surface, then ground contact is maintained, but the lean angle is limited to about 20 degrees
Solution Approach 1:
The patent implements dynamic leaning by allowing the entire front wheel assembly and chassis to rotate freely about the longitudinal axis through the rotational control shaft, rather than using fixed geometric constraints like U-shaped contacting surfaces. This dynamic rotation enables continuous adjustment of lean angle based on cornering forces, achieving greater than 20 degrees lean while maintaining ground contact through active control.
Solution Approach 2:
The patent adds a rotational degree of freedom about the longitudinal axis (roll dimension) to the traditional steering mechanism. By introducing this new dimensional movement capability through the rotational control shaft, the system transcends the 20-degree limitation imposed by fixed geometric constraints and enables three-dimensional orientation adjustment for improved cornering performance.
3Device complexity
If a simple trike design is used, then device complexity is low, but stability during high-speed cornering is poor
Solution Approach 1:
The patent implements preliminary action by using sensors to detect cornering forces before the trike becomes unstable, and the control system proactively adjusts the lean angle in advance. The rotational control shaft is positioned and configured to enable rapid rotation that counteracts centrifugal forces before they cause wheel lift or flipping, preventing instability rather than reacting to it after occurrence.
Solution Approach 2:
The patent implements feedback control by using sensors to continuously monitor cornering forces and feed this information to the control system, which adjusts the rotational control shaft position accordingly. This closed-loop feedback mechanism enables the simple trike design to achieve high-speed cornering stability by continuously adapting the lean angle based on real-time force detection, compensating for the inherent instability of three-wheel configurations.
Data Source
AI summary
A three-wheeled vehicle having a front wheel assembly attached to a chassis. The chassis includes a rotational control shaft having a rotational axis that is generally directed in a longitudinal direction of the vehicle. The rotational control shaft is integrated with or secured to the chassis in a non-rotational manner and passes through the front wheel assembly in a rotationally-free manner, such that the rotational control shaft can rotate about its rotational axis. The front wheel assembly includes one or more lean control motors, which are operably configured to rotate the rotational control shaft about its rotational axis thereby causing the chassis to lean from side to side to improve the handling ability of the vehicle. Some embodiments include a lean control system configured to automatically control the degree of rotation of the chassis.