Roll Block System for Three-Wheeled Vehicle Stability
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Solution Overview
Problem
Existing roll block systems for three-wheeled motor vehicles with an articulated quadrilateral steering structure are complex, costly, and can inhibit pitching and steering movements, leading to safety issues and instability during braking and impacts.
Innovation Solution
A roll block system that selectively blocks rolling movements by interconnecting the front wheels through the steering bar, allowing pitching and steering movements to remain unaffected, using a simple and cost-effective design that exploits existing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a roll block system with multiple separate blocking devices is used to prevent rolling movements, then the vehicle stability is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent combines multiple blocking functions into a single integrated blocking device that acts on the steering column. This single device can prevent both rolling movements and asymmetric suspension movements simultaneously, eliminating the need for separate blocking devices for each function and thereby reducing overall system complexity while maintaining stability
Solution Approach 2:
The blocking device is designed with multi-functionality to handle multiple types of unwanted movements (rolling and asymmetric suspension) through a single mechanism. The device can selectively block different movement types based on activation conditions, providing universal anti-roll protection without requiring multiple specialized components
2Reliability
If blocking devices are dimensioned to overcome impact forces, then the vehicle stability during impacts is improved, but the production cost increases
Solution Approach 1:
The blocking device incorporates dynamic characteristics that allow it to respond differently to various types of forces. The device can selectively engage to block rolling movements while allowing pitching movements to pass through, even when subjected to impact forces. This dynamic response capability is achieved through the specific mechanical design of the blocking mechanism that distinguishes between rolling and pitching force vectors
Solution Approach 2:
The blocking device applies blocking force selectively only in the direction needed to prevent rolling movements, rather than providing uniform blocking in all directions. This localized blocking approach allows the device to be dimensioned more efficiently, requiring less material and structural reinforcement than a fully rigid blocking system would need, thereby reducing production costs while maintaining stability during impacts
3Reliability
If the roll block system blocks pitching movements, then the vehicle stability is improved, but the safety deteriorates due to inability to absorb impacts
Solution Approach 1:
The blocking function is segmented to differentiate between rolling movements and pitching movements. The device selectively blocks only rolling movements while leaving pitching movements unblocked. This segmentation is achieved through the specific geometric configuration of the blocking mechanism that responds to the directional characteristics of different movement types, allowing the vehicle to maintain stability against rolling while remaining compliant to absorbing impacts through pitching
4Reliability
If a complex roll block system with multiple calipers is used, then the rolling prevention is improved, but the ease of manufacture deteriorates
Solution Approach 1:
Multiple blocking functions are merged into a single integrated blocking device that acts on the steering column. This consolidation eliminates the need for assembling multiple separate calipers and blocking mechanisms, significantly simplifying the manufacturing and assembly process while maintaining effective rolling prevention through the unified blocking action
Data Source
AI summary
Disclosed is a forecarriage of a rolling motor vehicle with three or four wheels, comprising: —a forecarriage frame; —at least a pair of front wheels kinematically connected one to each other and to the forecarriage frame by means of a first kinematic mechanism which enables the front wheels to roll in a synchronous and specular manner, each wheel being connected to said rolling kinematic mechanism by means of a respective axle journal, the latter being mechanically connected to a rotation pin of the wheel in order to support it rotatably around an axis of rotation; —means of suspension which provide each axle journal at least one spring suspension movement with respect to said rolling kinematic mechanism; —a steering device which kinematically connects the axle journals to each other so as to command the rotation of the axle journals around respective steering axes of each front wheel.