Tilting Forecarriage with Articulated Quadrilateral and Guide Wheel
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Solution Overview
Problem
Three-wheeled vehicles face challenges in balancing stability and maneuverability, as increased stability from additional components adds weight and may not guarantee road-holding ability like four-wheeled vehicles, while maintaining the ease of handling and low costs of two-wheeled designs.
Innovation Solution
A motor vehicle forecarriage with a specific geometry and kinematic system, featuring an articulated quadrilateral structure that supports front wheels in steering and tilting, with optimized hinge angles and tilting support structures to enhance stability and handling, including a tilting support structure with a guide wheel and elastic elements to control tilting movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If additional stability elements are added to a two-wheeled motor vehicle to improve stability, then stability is improved, but weight increases
Solution Approach 1:
The vehicle is segmented into two distinct wheel configurations: two rear wheels for stable support and one front wheel for maneuverability. This segmentation allows the vehicle to achieve both stability from the rear wheel base and agility from the front wheel steering, avoiding the need to add weight throughout the entire structure.
Solution Approach 2:
Different parts of the vehicle have different functional qualities: the rear portion is designed for stability with two driven wheels, while the front portion is designed for maneuverability with a single steerable wheel. This local differentiation of quality allows the vehicle to optimize each region for its specific function without compromising overall performance.
2Stability of the object's composition
If a three-wheeled vehicle uses two rear wheels for stability, then stability is improved, but maneuverability and ease of handling deteriorate
Solution Approach 1:
The vehicle divides its wheel configuration into two functional segments: two rear wheels providing a stable base for support and braking, and one front wheel providing steerable maneuverability. This segmentation resolves the contradiction by assigning different operational roles to different wheel groups.
Solution Approach 2:
Instead of placing the steerable wheel at the rear (which would compromise stability), the invention inverts the conventional approach by placing the single steerable wheel at the front, while keeping the two stable wheels at the rear. This inversion allows the steering function to be performed by a single wheel without compromising the stability provided by the rear wheel base.
3Ease of operation
If a three-wheeled vehicle uses two front wheels for maneuverability, then ease of handling is improved, but device complexity increases
Solution Approach 1:
The invention extracts the steering function from a complex paired-wheel system and concentrates it in a single front wheel. This extraction simplifies the kinematic system by eliminating the need for differential steering mechanisms, articulated quadrilaterals, and synchronized rotation systems that would be required for two front wheels, while still achieving effective maneuverability.
Solution Approach 2:
Instead of using two front wheels for steering (which would require complex kinematic systems), the invention inverts the configuration by using one front wheel for steering and two rear wheels for support. This inversion dramatically reduces device complexity while maintaining ease of handling through simple front-wheel steering.
4Weight of moving object
If three-wheeled vehicles use only three wheels, then weight is reduced, but stability and road-holding ability deteriorate
Solution Approach 1:
The vehicle applies different quality requirements to different wheel locations: the rear wheels are designed for stable road contact and support, while the front wheel is designed for steerable contact. This local quality differentiation allows the three-wheel configuration to achieve road-holding ability comparable to four-wheeled vehicles despite the weight advantage.
Solution Approach 2:
The wheel functions are segmented into two categories: two rear wheels dedicated to stable support and road contact, and one front wheel dedicated to steering and directional control. This functional segmentation allows the three-wheel vehicle to achieve both weight reduction and adequate road-holding ability by optimizing each wheel's role.
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 solution provides a vehicle with improved dynamic behavior, reduced vibrations, and a sense of safety, achieving stability and ease of handling comparable to four-wheeled vehicles while maintaining the agility of two-wheeled motorcycles, with a lighter and more compact design.
Implementation Method 1
a tilting support structure (72) for a stub axle (56) of each front wheel (10, 10'), mechanically connected to a rotation pin (68) of a front wheel (10, 10') so as to rotatably support the front wheel (10, 10') around a related rotation axis (R-R), the tilting support structure (72) being hinged to the articulated quadrilateral (20) by means of steering hinges (76) arranged at the upper ends (60) and lower ends (64) of each upright (48, 48'), said steering hinges (76) defining respective steering axes (S'-S', S''-S''')
Data Source
Figure 1
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Figure 3~4
AI summary
Motor vehicle forecarriage (8) comprising a forecarriage frame (16), a pair of front wheels (10', 10") kinematically connected to the forecarriage frame (16) by means of an articulated quadrilateral (20), said articulated quadrilateral (20) comprising a pair of cross members (24', 24"), hinged to the forecarriage frame (16) at middle hinges (28), said cross members (24', 24") being connected to each other at opposite transverse ends (40, 44), by means of uprights (48, 48', 48") pivoted to said transverse ends (40, 44) at side hinges (52), the cross members (24', 24") and the uprights (48), the tilting support structure (72) being hinged to the articulated quadrilateral (20) by means of steering hinges (76) a guide wheel (88) connected to the rotation pin (68) of front wheel (10', 10") at a special wheel attachment (94), a support bracket (92) hinged to the articulated quadrilateral (20) by means of said steering hinges (76), the guide wheel (88) being in turn hinged to the support bracket (92) at opposite upper and lower axial ends (96, 98).