Three-row wheel vehicle front suspension pivot mechanism
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Solution Overview
Problem
Existing three-row wheel vehicles face challenges in traversing steps and protrusions due to limitations in wheel elevation mechanisms, which affect stability and the ability to ride over high steps, as they rely primarily on upward force and change the vehicle's center of gravity when adjusting link lengths and angles.
Innovation Solution
The vehicle incorporates a mechanism with laterally spaced leading arms, swing arms, and connecting links that utilize both upward and rearward forces to pivot the front wheel group upward, maintaining stability by adjusting pivot axis heights and applying reaction forces to support wheel elevation without altering the vehicle's center of gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the front wheel is passively lifted by adjusting link lengths and offset angles, then the front wheel can be raised to pass over protrusions, but the front wheel cannot actively climb high steps and vehicle stability deteriorates due to center of gravity changes
Solution Approach 1:
The leading arm is configured to pivot in the vertical direction around a lateral pivot axis, enabling dynamic adjustment of the front wheel group's elevation. This dynamic mechanism allows the front wheel to actively climb high steps by pivoting upward when encountering obstacles, rather than relying on passive link length adjustments that compromise stability.
2Adaptability or versatility
If link lengths and offset angles are adjusted to raise the front wheel, then the front wheel can clear obstacles, but the center of gravity position changes and running stability deteriorates
Solution Approach 1:
The wheel elevation mechanism is segmented into independent components: the leading arm pivoting around a lateral pivot axis, swing arms connected to front wheels, and connecting links. This segmentation allows the front wheel group to elevate independently without altering the overall vehicle center of gravity position, maintaining running stability while achieving obstacle clearance capability.
3Adaptability or versatility
If the front wheel group is elevated to climb high steps, then traversability improves, but the mechanism becomes more complex and requires active force utilization
Solution Approach 1:
The elevation mechanism uses dynamic pivoting action of the leading arm around a lateral pivot axis, combined with swing arms that rotate in the front-rear direction. This dynamic configuration enables the front wheel group to actively climb high steps by utilizing both upward and rearward forces from obstacles, achieving high traversability without excessive mechanical complexity.
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
This configuration allows the front wheel to efficiently ride over steps of varying heights, including those equal to or greater than the wheel radius, without compromising vehicle stability, by effectively using both upward and rearward forces and maintaining the center of gravity's position.
Implementation Method 1
Each leading arm is connected at a rear end portion to a vehicle body so as to pivot in a vertical direction around a first lateral pivot axis
Implementation Method 2
each swing arm is connected to a front end portion of the leading arm so as to swing in the front-rear direction around a second lateral pivot axis
Implementation Method 3
each connecting link is arranged to apply a reaction force including an upward component to the swing arm when a rearward force acts from the corresponding wheel of the front wheel group to the one end via the swing arm
Data Source
AI summary
A three-row wheel vehicle having front, center and rear wheels has laterally spaced leading arms each pivotably connected to a vehicle body, laterally spaced swing arms each connected to the front end of the leading arm swingably in the front and rear direction and rotatably supporting the front wheel at the lower end, and laterally spaced connecting links each attached at one end to the swing arm pivotably around an axis and attached at the other end to the vehicle body pivotably around another axis; heights of the axes are different when the vehicle is on a horizontal flat traveling road; and each connecting link is arranged to apply a reaction force including an upward component to the swing arm when a rearward force acts from the front wheel to the one end via the swing arm.