Variable Trail Mechanism Torsion Reduction for Vehicle Stability
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Solution Overview
Problem
The existing vehicle designs with variable trail length mechanisms suffer from reduced stiffness of the front wheel surrounding structure during ordinary traveling states, where the trail length is positive, leading to instability and difficulty in maintaining vehicle control.
Innovation Solution
Incorporating a torsion reduction portion with a fitted and fitting portion configuration within the steering and oscillation units, which reduces torsion and enhances stiffness by fitting together under specific trail length conditions, ensuring the oscillation unit is not deformed during ordinary traveling states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable trail length mechanism is implemented to enable the front wheel to be disposed at a rearmost position, then adaptability is improved, but stiffness of the front wheel surrounding structure deteriorates
Solution Approach 1:
The oscillation unit is designed to be oscillatable in the fore-aft direction, allowing the front wheel surrounding structure to dynamically adjust its configuration between different trail length positions (frontmost and rearmost) while maintaining structural integrity through controlled oscillation rather than rigid fixed positions
Solution Approach 2:
The torsion reduction portion is specifically designed to reduce torsion only in the vehicle width direction through the oscillation unit, while maintaining torsion resistance in other directions. This localized torsion reduction allows the structure to be flexible where needed (fore-aft oscillation) while remaining stiff where required (lateral stability during ordinary traveling)
2Adaptability or versatility
If the oscillation unit is made movable to enable trail length variation, then adaptability is improved, but structural stability deteriorates
Solution Approach 1:
The trail length parameter is changed by oscillating the front wheel surrounding structure in the fore-aft direction, allowing the vehicle to adapt to different traveling conditions (low speed vs. ordinary speed) while maintaining structural stability through controlled parameter variation rather than permanent structural changes
Data Source
AI summary
A vehicle body includes a vehicle body frame and a steering rotation unit that is supported on the vehicle body frame and that rotates about a steering axis. The vehicle includes a variable trail length mechanism. The variable trail length mechanism varies a trail length of a front wheel and includes an oscillation unit and a torsion reduction portion. The oscillation unit is connected with the steering rotation unit so as to be oscillatable in a fore-aft direction and supports the front wheel. The torsion reduction portion reduces torsion of the oscillation unit in a vehicle width direction through the oscillation unit combined with the steering rotation unit under a condition in which the trail length is changed such that the front wheel is disposed at a rearmost position.