Tire Strip Deposition Locking for Axial Positioning
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Solution Overview
Problem
Existing methods for building tire components on forming drums often result in axial displacement of strip-like elements due to asymmetric tractive forces and insufficient adhesion, leading to incorrect placement and increased complexity and cost, especially with cylindrical supports.
Innovation Solution
A process and apparatus that lock a central portion of the strip-like element on the forming drum using a counter-element during deposition, ensuring accurate axial positioning and high-speed application by synchronizing support and retaining unit movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If strip-like elements are laid on a cylindrical forming drum using conventional methods, then the deposition process can be performed, but axial displacement occurs due to asymmetric tractive forces and insufficient adhesion
Solution Approach 1:
The patent applies preliminary action by introducing a retaining unit that locks the strip-like element to the forming drum before the deposition process begins. This preliminary locking prevents axial displacement caused by asymmetric tractive forces during subsequent deposition operations, ensuring accurate axial positioning from the start.
Solution Approach 2:
The retaining unit acts as an intermediary between the strip-like element and the forming drum. It provides a mechanical connection that overcomes insufficient adhesion forces, mediating the interaction to prevent axial displacement while allowing the deposition process to proceed normally.
2Productivity
If the deposition speed is increased to improve productivity, then more tires can be produced per unit time, but axial displacement increases due to higher asymmetric tractive forces
Solution Approach 1:
The retaining unit applies preliminary anti-action by counteracting the asymmetric tractive forces before they can cause axial displacement. By locking the strip-like element to the forming drum in advance, the system can tolerate higher deposition speeds without sacrificing positioning accuracy, as the retaining force prevents the harmful displacement effect.
3Manufacturing precision
If a retaining unit is added to lock the strip-like element, then axial positioning accuracy improves, but device complexity increases
Solution Approach 1:
The patent extracts the retention function as a separate, dedicated unit rather than integrating it into the existing deposition mechanism. This modular approach allows the retaining unit to be added independently, providing the necessary locking function without requiring fundamental redesign of the entire deposition system, thus limiting the increase in overall device complexity.
Data Source
AI summary
A process and an apparatus for building tyres for vehicle wheels includes assembling at least one tyre component through laying of strip-like elements disposed circumferentially close to each other on a deposition surface radially external to the forming drum, wherein laying of each strip-like element includes: radially moving the strip-like element close to the deposition surface; locking a central portion of the strip-like element against the deposition surface; and pulling the strip-like element in opposite directions starting from the central portion toward the opposite ends thereof, while the central portion is maintained in a locked condition against the deposition surface, so as to progressively lay down the strip-like element against the deposition surface.