Modular Filtering Pulley for Heavy-Vehicle Torsional Vibration
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Solution Overview
Problem
Heavy vehicles experience significant torsional vibrations from internal combustion engines, leading to irregularities in the rotation of drive pulleys and increased manufacturing costs due to the need for various pulley configurations and dimensions.
Innovation Solution
A filtering pulley design featuring a hub connected to a shaft, an annular crown, and a filtering assembly with elastic elements and actuator means that selectively transmit torque between the hub and crown, allowing for adjustable filtering and damping of torsional vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different configurations and dimensions of filtering pulleys are used for different heavy vehicle types, then the pulleys can be adapted to specific vehicle requirements, but the manufacturing costs increase
Solution Approach 1:
The filtering pulley is divided into distinct modular components: a hub assembly, a crown assembly, and elastic filtering elements. These modules can be manufactured separately and reconfigured for different vehicle applications, reducing overall manufacturing complexity and cost while maintaining adaptability.
Solution Approach 2:
The patent designs the filtering pulley with universal mounting features and standardized interfaces that allow the same basic design to serve multiple heavy vehicle configurations. The elastic elements and crown can be adjusted or replaced to accommodate different torque requirements without redesigning the entire pulley system.
2Device complexity
If traditional filtering pulley designs are used without modular components, then the structure is simpler, but the ability to adapt to different vehicle types requires complete redesign
Solution Approach 1:
The filtering pulley incorporates elastic elements that provide dynamic adaptation to varying torque loads and rotational speeds across different vehicle applications. The elastic deformation of these elements automatically adjusts the filtering characteristics without requiring mechanical reconfiguration.
Solution Approach 2:
The crown assembly is designed to fit over the hub assembly with nested positioning features, allowing the components to be easily assembled and disassembled. This nested structure enables rapid reconfiguration for different vehicle types while maintaining a compact overall form factor.
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 pulley effectively dampens torsional vibrations, reduces manufacturing costs by allowing for adaptable designs without replacing the filtering assembly, and supports large loads with enhanced durability and flexibility.
Implementation Method 1
one or more elastic elements, through which a torque is transmitted by the hub to the crown
Implementation Method 2
In order to 'filter' the torsional vibrations transmitted by the crankshaft to the belt, a filtering pulley is generally used
Data Source
AI summary
Filtering pulleys have a hub, which is designed to be fixed to a rotary shaft rotating around an axis (A), and a crown, which is coaxial to said hub. The filtering pulley includes a filtering assembly operatively interposed between the hub and the crown and a housing integral to the crown and carried so that the housing can freely rotate relative to the hub by means of support means. The filtering assembly defines a space and has elastic means housed inside the space in a movable manner, and has actuator means configured to cooperate in contact with the elastic means. The actuator means is a single piece together with a tubular portion of the hub and the housing cooperating in contact with the radial inner surface of the crown.