Three-Row Wheel Vehicle Front Pivot Link Mechanism
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Solution Overview
Problem
Existing three-row wheel vehicles face difficulties in traversing high steps due to limited upward movement of the front wheel group, which affects stability and ability to ride over protrusions, as they rely primarily on upward force and change in center of gravity for clearance.
Innovation Solution
The vehicle incorporates laterally spaced front and rear pivot links, swing arms, force transmission mechanisms, and connecting links that convert rearward forces into upward forces, allowing the front wheel group to be actively raised and maintain stability by utilizing both upward and rearward forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the front wheel is raised by adjusting link lengths and offset angles, then the front wheel can pass over protrusions and climb steps, but the center of gravity position changes and running stability deteriorates
Solution Approach 1:
The front pivot link is designed to pivot in the vertical direction around a pivot axis at its middle portion, allowing dynamic adjustment of the front wheel group position. This dynamic mechanism enables the front wheel to be actively raised when approaching steps while maintaining the ability to return to a stable running position, thus resolving the contradiction between step-climbing capability and running stability.
2Device complexity
If the front wheel is not actively raised, then the vehicle structure remains simple, but the front wheel cannot get over high steps
Solution Approach 1:
The swing arm mechanism connected to the front pivot link provides active raising capability through controlled movement. When the front wheel approaches a step, the swing arm pivots to lift the front wheel group, enabling the vehicle to overcome high steps without requiring complex additional actuation systems, thus maintaining structural simplicity while enhancing step-climbing ability.
3Device complexity
If only upward force is utilized, then the force transmission system remains simple, but the front wheel group cannot efficiently ride on high steps
Solution Approach 1:
The force transmission mechanism is designed to convert rearward force from the swing arm into upward force on the front pivot link through pivotal movement. This dynamic force conversion utilizes both upward and rearward force components, significantly improving the efficiency of front wheel group elevation on high steps without requiring a complex multi-force transmission system.
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 enables the front wheel group to efficiently ride over steps of varying heights without significant deterioration in vehicle stability, even when the step height equals or exceeds the front wheel radius, by effectively utilizing both upward and rearward forces, and maintains center wheel stability.
Implementation Method 1
each force transmission mechanism being configured to convert a rearward force transmitted from the corresponding wheel of the front wheel group to the swing arm into an upward force and transmit the upward force to the front pivot link
Implementation Method 2
Each front pivot link that is connected at a middle portion to a vehicle body so as to pivot in a vertical direction around a first pivot axis; each rear pivot link is connected to the vehicle body so as to pivot in a vertical direction around a third pivot axis
Implementation Method 3
each swing arm is connected to a front end portion of the front pivot link so as to swing in a front-rear direction around a second pivot axis
Data Source
AI summary
A three-row wheel vehicle having front, center and rear wheels has laterally spaced front pivot links each pivotably connected at a middle to a vehicle body, laterally spaced swing arms each swingably connected to a front end of the front pivot link and rotatably supports the front wheel at a lower end, laterally spaced rear pivot links each pivotably connected to the vehicle body at a middle and rotatably supports the rear wheel at a rear end, laterally spaced force transmission mechanisms each configured to convert a rearward force transmitted from the front wheel to the swing arm into an upward force and transmit the upward force to the front pivot link on a front side of the middle, and laterally spaced connecting links each pivotably attached to a rear end of the front pivot link and a front end of the rear pivot link.