Rolling Motor Forecarriage Anti-Roll System
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Solution Overview
Problem
Existing anti-roll systems for three-wheeled motor vehicles require large and costly actuators to block rolling movements, leading to increased dimensions and costs, and struggle with symmetrical blocking without significant size and cost increments.
Innovation Solution
A forecarriage with an anti-roll system using a rod lockable at one end, featuring a connecting rod-crank kinematic mechanism that blocks roll movements through a static mechanical constraint, reducing actuator power requirements and allowing smaller, more cost-effective actuators, and enabling symmetrical blocking without substantial size or cost increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anti-roll systems use large actuators to block rolling movements, then roll blocking effectiveness is improved, but actuator size and cost increase
Solution Approach 1:
The anti-roll system is divided into two independent diagonal rod assemblies, each blocking roll movement through a separate mechanical constraint path. This segmentation allows each actuator to work independently with reduced size requirements, as each only needs to provide sufficient blocking force for one diagonal rather than requiring a single large actuator to handle the entire roll blocking function.
Solution Approach 2:
A mechanical constraint mechanism acts as an intermediary between the actuator and the rod, amplifying the blocking effect. The constraint mechanism includes a sliding element that moves along the rod and a blocking element that engages with the rod to prevent rolling movements, allowing smaller actuators to achieve effective roll blocking through mechanical advantage.
2Measurement precision
If symmetrical roll blocking is implemented, then roll control precision is improved, but system dimensions and costs increase significantly
Solution Approach 1:
The system uses asymmetrical diagonal rod arrangements where rods are positioned at different orientations (one diagonal from front-left to rear-right, another from front-right to rear-left). This asymmetrical configuration enables symmetrical roll blocking functionality while maintaining compact dimensions, as the diagonal arrangement naturally distributes the blocking forces efficiently across the vehicle structure.
Solution Approach 2:
Each diagonal rod assembly serves multiple functions: it provides roll blocking, maintains structural rigidity, and works with the mechanical constraint mechanism to enable precise control. This multi-functionality reduces the need for additional components that would increase system dimensions and costs.
3Power
If mechanical constraint mechanisms are added to reduce actuator size, then actuator power requirements are reduced, but device complexity increases
Solution Approach 1:
The mechanical constraint mechanism is designed to automatically engage and disengage based on the actuator's movement. The sliding element moves along the rod and the blocking element engages with the rod through the actuator's own motion, eliminating the need for separate control mechanisms and reducing overall system complexity despite the added mechanical components.
Data Source
AI summary
The present invention relates to a forecarriage of a rolling motor vehicle with three or four wheels, comprising: a forecarriage frame (16); at least one pair of front wheels (10′, 10″) kinematically connected to each other and to the forecarriage frame by a kinematic roll mechanism (20) which enables the same to roll in a synchronous and specular manner; an anti-roll system (100) comprising a rod (110) having a first (111) and a second end (112) opposite each other which connect by means of hinging means (101′, 101″ and 102′, 102″) a first (60) and a second anchoring portion (60) of forecarriage (8) directly to each other. At least one of said first (60) and second anchoring portions (60) is subject to roll movements of said two front wheels (10′, 10″). The hinging means (101′, 101″ and 102′, 102″) are configured to passively follow the movements of two anchoring portions. The hinging means (101′, 101″) at the first end (111) of the rod comprise at least a first roll hinge (101′) which has its hinge axis substantially orthogonal to a rolling plane of the two front wheels and is connected to the first anchoring portion (60). The anti-roll system comprises a first blocking device suitable to reversibly block a rotation angle α of rod (110) with respect to the first roll hinge 101′ at the first end (111). Such an angle of rotation a corresponds to the roll angle of the rod.