Filtering Pulley Structure for Higher Torque Vibration Damping

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Solution Overview

Problem

Existing filtering pulleys for electric machines in vehicle engine systems limit torque transmission to 50-75 Nm, restricting their application in configurations requiring a wider operating range.

Innovation Solution

A filtering pulley design featuring a hub, crown, and a filtering unit with a rolling bearing support, elastic means, and damping means, allowing for adjustable torque transmission and reduced dimensions, with interchangeable filtering units and reversible mechanical connections for easy assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a filtering unit with springs or elastic elements is used between the hub and crown, then torsional vibrations are filtered and dynamic overloads are avoided, but the transmissible torque is limited to 50-75 Nm

Engineering Contradiction:

Improveprotection against dynamic overloadsVSAvoidtransmissible torque

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The filtering unit is divided into multiple independent elastic elements (springs) arranged circumferentially, each capable of withstanding high loads. This segmentation allows the distribution of torque across multiple elements, enabling the system to transmit higher torques while maintaining vibration filtering capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs composite construction by combining rigid components (hub, crown, housing) with elastic elements (springs, dampers). This composite approach allows the system to simultaneously achieve high torque transmission through rigid structures and vibration filtering through elastic elements, resolving the contradiction between strength and flexibility.

Inventive Principle:

Principle #40Composite materials

2Force

If the filtering unit is integrated within the pulley structure, then torque transmission is enabled, but the pulley dimensions and assembly complexity increase

Engineering Contradiction:

Improvetorque transmissionVSAvoidpulley structure complexity

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The filtering unit is designed as a separate, modular assembly that can be independently manufactured and then integrated into the pulley. This segmentation reduces the complexity of the main pulley structure and simplifies assembly, while still enabling torque transmission through the standardized interface between the hub and crown.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filtering unit acts as an intermediary component between the hub and crown, providing a standardized interface that simplifies the overall design. This mediator approach allows the complex filtering functionality to be isolated in a separate module, reducing the complexity burden on the main pulley structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If traditional filtering units are used, then vibration filtering is achieved, but assembly and disassembly are difficult and contamination protection is insufficient

Engineering Contradiction:

Improvevibration filteringVSAvoidassembly ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The filtering unit is designed with universal mounting features that allow for easy assembly and disassembly. The standardized interface and modular design enable the same filtering unit to be quickly installed and removed from different pulley configurations, improving manufacturability and maintenance ease while maintaining vibration filtering performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The filtering unit incorporates sealed housings and protective covers that prevent contamination of internal elastic elements. These flexible yet protective enclosures allow for easy assembly while providing robust contamination protection, resolving the contradiction between accessibility and protection.

Inventive Principle:

Principle #30Flexible shells and thin films

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

Enables efficient torque transmission across a wide range while reducing pulley dimensions and assembly costs, with improved durability and contamination protection.

Implementation Method 1

a crown (3), preferably tubular, externally coaxial with the hub (2) and rotationally freely supported on the latter by support means (4)

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

a filtering unit (5) operatively interposed between the hub (2) and the crown (3) for the transmission of the torque

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 3

filtering unit (5) operatively interposed between the hub (2) and the crown (3) for the transmission of the torque

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS20260043464A1Improved filtering pulley

Publication Date: 2026.02.12 MUVIQ SRL

AI summary

A filtering pulley has a hub adapted to be fixed to a shaft rotating around an axis (A), a crown mounted coaxially and rotationally free on the hub and a filtering unit operatively interposed between the hub and the crown. The hub has a first portion and a second portion, with the first portion being radially encompassed around the axis (A) by the crown, and with the second portion being only partially radially encompassed around the axis (A) by the crown. The pulley has a support means for supporting the crown on the hub, which is the only element radially interposed between the first portion and the crown.