Pulley-Torsional Damper Assembly With Adhesive-Stabilized Elastomer Ring
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Solution Overview
Problem
Existing pulley-torsional damper integrated groups face issues with elastomeric ring instability, leading to micro cracks and potential breakage due to axial movements, which reduce the damping effect over time.
Innovation Solution
A pulley-damper integrated group with a hub and pulley design that incorporates an elastomeric ring secured using adhesives on specific portions of its surface, preventing axial movement and enhancing ring stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the elastomeric ring is simply inserted between hub and pulley relying on friction, then the ease of manufacture is improved, but the reliability deteriorates due to axial movements causing micro cracks and potential breakage
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the elastomeric ring and the metal surfaces (hub and pulley). This adhesive mediator creates a strong chemical bond that prevents axial movements while maintaining the simplicity of the assembly process. The adhesive acts as a bridge that transfers stresses uniformly and eliminates relative motion between the ring and mating surfaces.
Solution Approach 2:
The surface properties of the elastomeric ring and/or metal surfaces are modified by applying an adhesive coating. This changes the interface parameters from simple friction-based contact to chemically-bonded contact, fundamentally altering the mechanical interaction and preventing axial displacement that leads to cracking.
2Reliability
If the elastomeric ring is secured with adhesive on specific portions of its surface, then the reliability is improved by preventing axial movements, but the device complexity increases
Solution Approach 1:
Instead of applying adhesive over the entire surface of the elastomeric ring, the adhesive is applied only to specific portions or zones where it is most needed to prevent axial movement. This localized application reduces material usage, simplifies the manufacturing process, and maintains reliability while minimizing added complexity.
3Strength
If adhesive is applied to secure the elastomeric ring, then the strength of the connection is improved, but the manufacturing precision requirements increase
Solution Approach 1:
By concentrating the adhesive application to specific strategic locations on the elastomeric ring rather than the entire surface, the tolerance requirements for adhesive placement are significantly reduced. This localized approach maintains strong connection while being more forgiving of manufacturing variations.
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 solution effectively prevents micro cracks and breakage of the elastomeric ring, maintaining the damping effect and ensuring the longevity of the pulley-damper group by securely fixing the elastomeric ring between the hub and pulley.
Implementation Method 1
at least one adhesive agent is arranged on at least one of the outer surfaces (4a) towards the pulley or inner surface (4b) towards the hub of the ring (4)
Implementation Method 2
a ring (4) of elastomeric material functioning essentially as a filter for the torsional oscillations
Data Source
AI summary
Pulley-torsional damper integrated group comprising a hub (2) adapted to be rigidly connected to a drive member and a pulley (3) connected to the hub (2). The hub (2) comprises an inner tubular wall (6) and an outer tubular wall (7). The pulley is angularly coupled to said hub by means of the ring made of elastomeric material. The elastomeric ring (4) has an outer surface (4a) towards the pulley and an inner surface (4b) towards the hub, and an adhesive (22, 23) is arranged on at least one of the outer or inner surfaces.