Pulley-Torsional Damper Assembly With Adhesive Ring Fixation
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Solution Overview
Problem
Pulley-torsional damper integrated groups in motor vehicles experience reduced damping effect and potential breakage due to axial movement of elastomeric rings, which are not securely fixed and prone to micro cracks from continuous stress.
Innovation Solution
A pulley-damper integrated group with a hub and pulley connected by an elastomeric ring, where an adhesive covers 90% or less of the axial extension on the ring's surfaces to prevent axial movement and secure the ring in place, reducing the risk of cracking and breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the elastomeric ring is simply inserted between hub and pulley and remains in its seat by simple friction, then the assembly process is simple and ease of manufacture is improved, but the ring is not fixed securely and can move axially causing micro cracks and reduced reliability
Solution Approach 1:
The adhesive is applied to the elastomeric ring before assembly, creating a preliminary bonding action that prevents axial movement during operation. This preliminary fixation eliminates the need for complex mechanical retention structures while ensuring reliable positioning of the ring between hub and pulley.
Solution Approach 2:
The adhesive acts as an intermediary substance between the elastomeric ring and the metal surfaces (hub and pulley), creating a chemical bond that secures the ring in place. This intermediary material resolves the contradiction by providing secure fixation without compromising the simplicity of the assembly process.
2Reliability
If adhesive is applied to cover the entire axial extension of the elastomeric ring, then the ring fixation is maximized and reliability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The adhesive is applied selectively to specific zones of the elastomeric ring rather than uniformly across the entire surface. This localized application focuses the bonding action where it is most needed to prevent axial movement, while reducing material consumption and manufacturing complexity compared to full-surface coating.
Solution Approach 2:
Instead of applying adhesive to the entire axial extension of the ring, the solution uses partial action by limiting the adhesive coverage to critical areas. This partial application is sufficient to achieve the desired fixation effect while avoiding the unnecessary complexity and cost of complete surface coverage.
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 fixes the elastomeric ring, preventing micro cracks and axial movement, thereby enhancing the durability and damping performance of the pulley-damper integrated group while simplifying the assembly process.
Implementation Method 1
An adhesive is present on the outer surface and/or the inner surface of the elastomeric ring
Implementation Method 2
a ring of elastomeric material functioning essentially as a filter for the torsional oscillations
Data Source
AI summary
Pulley-torsional damper integrated group comprising a hub adapted to be rigidly connected to a drive member and a pulley connected to the hub. The hub comprises an inner tubular wall and an outer tubular wall. The pulley is angularly coupled to said hub by means of the ring made of elastomeric material. The elastomeric ring has an outer surface towards the pulley and an inner surface towards the hub, and an adhesive is arranged on at least one of the outer or inner surfaces.