Tilting Four-Bar Linkage for Three-Wheeled Vehicle Stability
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Solution Overview
Problem
Existing three-wheeled tilting scooters have complex and costly structures, requiring numerous components, which makes them cumbersome, heavy, and expensive, limiting their stability and comfort due to the need for small-diameter wheels.
Innovation Solution
A simplified three-wheeled tilting vehicle design featuring a tilting four-bar linkage with a single front crosspiece and a rear crosspiece, where the footboards are supported by rocker arms, allowing for larger wheel diameters and improved stability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex four-bar linkage structure with two front crosspieces and multiple rocker arms is used to enable tilting movement, then the vehicle can achieve tilting capability for improved handling on bends, but the structure becomes complex and costly with increased number of components
Solution Approach 1:
The patent merges the functions of multiple rocker arms into a single integrated rocker arm structure. The first and second rocker arms in the prior art are combined into one rocker arm that directly connects the front crosspiece to the rear crosspiece, reducing the number of components while maintaining the tilting capability. This merging eliminates the need for complex connections between multiple rocker arms and crosspieces.
Solution Approach 2:
The single rocker arm is designed to perform multiple functions: it supports the front crosspiece, enables tilting movement, and provides structural connection to the rear crosspiece. The front crosspiece itself serves dual purposes as both a structural element and a connection point for the steering mechanism, reducing the need for separate dedicated components.
2Stability of the object's composition
If multiple crosspieces and rocker arms are used to support footboards, then the tilting mechanism is established, but the vehicle weight increases and ease of handling deteriorates
Solution Approach 1:
The patent combines multiple support elements into fewer, more efficient structures. The single rocker arm replaces two rocker arms, and the simplified crosspiece configuration reduces the overall material usage. The footboards are directly supported by the streamlined linkage structure, eliminating redundant support components.
Solution Approach 2:
The patent extracts and removes unnecessary components from the four-bar linkage system. By identifying and eliminating redundant crosspieces and rocker arms that do not contribute essential functionality, the overall weight is reduced while the core tilting mechanism remains intact and functional.
3Adaptability or versatility
If a complex structure with multiple components is adopted, then the tilting functionality is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent merges multiple manufactured components into fewer parts that can be produced more efficiently. The single rocker arm and simplified crosspiece structure reduce the number of manufacturing operations, assembly steps, and quality control checkpoints, thereby lowering overall manufacturing costs while maintaining tilting functionality.
Solution Approach 2:
The patent segments the four-bar linkage into essential functional elements only, removing non-essential segments. This segmentation approach identifies the minimum necessary components (single rocker arm, front crosspiece, rear crosspiece) required to achieve tilting, reducing manufacturing complexity and cost.
4Stability of the object's composition
If the four-bar linkage requires small-diameter wheels due to structural constraints, then the linkage fits within the vehicle frame, but the vehicle stability and comfort deteriorate
Solution Approach 1:
The patent merges the linkage components more efficiently in space, creating a compact configuration that accommodates larger wheels. The single rocker arm and simplified crosspiece arrangement reduce the vertical and horizontal space requirements of the linkage, allowing larger-diameter wheels to be installed without interfering with the tilting mechanism.
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
The design results in a lighter, easier-to-handle, and more cost-effective vehicle with enhanced stability and comfort, enabling the use of larger wheels for improved driving experience.
Implementation Method 1
the tilt (roll) movement, which allows the vehicle to tilt around a horizontal axis lying in the median plane of the vehicle and passing through the contact point between ground and rear wheel, is obtained with a deformation of the four-bar linkage
Implementation Method 2
The left end of the front crosspiece is hinged directly to the left rocker arm, in particular with a first left hinge that connects the left end of the front crosspiece and the left rocker arm to each other
Data Source
AI summary
There is described a three-wheeled vehicle (1) with two front steered wheels and two footboards (41.1, 41.2) on which the driver stands to drive the vehicle. The footboards are supported on a tilting four-bar linkage, having a front crosspiece 27 and a rear crosspiece 33, between which two rocker arms 31.1 and 31.2 extend. The front steered wheels are supported by the rocker arms and rotate around steering axes (S.1, S.2).