Roll Block System Axial Rod Transmission for Three-Wheeled Vehicle Balance

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Solution Overview

Problem

Existing roll block systems for three-wheeled motor vehicles require large and costly actuators to maintain balance and prevent rolling, especially when blocking both ends of a connecting rod, which increases overall dimensions and costs, and do not allow for symmetrical blocking without duplicating components.

Innovation Solution

A roll block system that uses a rod connecting the axle journals of the front wheels via ball joints, with a transmission mechanism that allows axial rotation of rod portions, enabling blocking at both ends with reduced actuator power and size, and incorporating a blocking device with a smaller actuator to achieve symmetrical blocking without increasing dimensions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a rod connects the axle journals of the front wheels with ball joints and transmission means to enable blocking at both ends, then the actuator size and power requirements are reduced, but the device complexity increases due to the transmission mechanism

Engineering Contradiction:

Improveactuator powerVSAvoiddevice complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

Transmission means act as an intermediary mechanism between the ball joints and the rod portions, converting rotational movement into axial rotation. This mediator enables the rod to block both ends with reduced actuator power while managing the complexity through functional decomposition.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The transmission means change the motion parameters by converting rotation around an axis perpendicular to the roll plane into rotation around the longitudinal extension axis of the rod. This parameter transformation allows the same actuator power to achieve blocking at both ends of the rod.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If symmetrical blocking of both front wheels is implemented, then the balance and stability are improved, but the overall dimensions and costs increase due to component duplication

Engineering Contradiction:

Improvevehicle stabilityVSAvoidoverall dimensions

Core Design Contradiction:

Stability of the object's compositionVSLength of stationary object

Solution Approach 1:

The rod connects both axle journals into a single integrated structure, merging the blocking function into one component rather than using separate blocking mechanisms for each wheel. This consolidation achieves symmetrical blocking without duplicating components, maintaining stability while reducing dimensions and costs.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single rod with transmission means performs multiple functions: it connects both axle journals, enables blocking at both ends, and provides symmetrical roll prevention. This multi-functional design eliminates the need for separate blocking systems for each wheel.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the rod portions are allowed to rotate axially through transmission means, then the blocking effectiveness is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improveblocking effectivenessVSAvoidmanufacturing ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The transmission means replace a potentially complex mechanical blocking system with a more manufacturable mechanism that uses controlled axial rotation of rod portions. This substitution maintains blocking effectiveness while improving manufacturability through standardized components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11046136B2Forecarriage of a rolling motor vehicle with rolling block

Publication Date: 2021.06.29 PIAGGIO & C SPA

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 (16) by a kinematic roll mechanism (20) which enables the same to roll in a synchronous and specular manner; a roll block system (100) comprising a rod (110) which directly connects to each other at the two ends thereof by means of ball joints or hinging means equivalent to ball joints (101, 102), two parts of the forecarriage both subject to rolling movements of said two front wheels or said forecarriage frame and a forecarriage part subject to said rolling movements. The roll block system comprises a blocking device (111a, 112a; 130) adapted to block the rotation angle of said rod at the two ends thereof with respect to a rolling plane of said forecarriage.