Pneumatic Tyre Reinforcement Layer Protection
Solution Overview
Problem
The existing pneumatic vehicle tires with additional reinforcement layers suffer from reduced durability due to severe stress and damage between the rubber layers of the carcass ply and the additional reinforcement ply, leading to direct contact and chafing between the reinforcement members.
Innovation Solution
A rubber layer made from the same material as the carcass ply is placed between the carcass layer and the additional reinforcement layer to prevent direct contact and enhance bonding during vulcanization, improving durability by absorbing mechanical stress and reducing shear loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an additional reinforcing layer is arranged axially outside the carcass ply to stiffen the tire sidewall and enable run-flat capability, then the tire's structural strength and run-flat capability are improved, but the rubber layers between carcass ply and additional reinforcing layer are subjected to significant stress and damage, leading to direct contact and abrasion between reinforcing elements that reduces tire service life
Solution Approach 1:
A protective rubber layer is introduced as an intermediary between the carcass ply and the additional reinforcing layer. This intermediate layer prevents direct contact and abrasion between the reinforcing elements of both layers, thereby eliminating the harmful friction while maintaining the structural strength provided by the additional reinforcing layer. The protective layer acts as a mediator that preserves the service life of the tire without compromising its load-bearing capacity.
2Adaptability or versatility
If additional reinforcing layers are placed directly on the carcass layer to provide reinforcement, then the tire gains run-flat capability and sidewall stiffness, but the adjacent rubber layers experience severe stress and damage under load, causing the reinforcing layers to come into direct contact and abrade
Solution Approach 1:
The protective rubber layer serves as a mediator between the carcass ply and the additional reinforcing layer, preventing direct contact and abrasion between the reinforcing elements. This intermediary layer allows the tire to maintain run-flat capability and sidewall stiffness while eliminating the harmful abrasion that would otherwise occur between the reinforcing layers under load.
3Device complexity
If multiple reinforcing layers are positioned close together to reduce tire weight and complexity, then the tire structure becomes more compact and economical, but the thin rubber layers between them are prone to damage and allow direct contact between reinforcing elements, reducing durability
Solution Approach 1:
The protective rubber layer is introduced as an intermediary that prevents direct contact between the reinforcing elements of adjacent layers. This allows the tire to maintain a compact structure with reinforcing layers positioned close together for reduced weight and complexity, while the intermediate protective layer ensures durability by preventing abrasion between the reinforcing elements.
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 direct contact between reinforcement layers, enhancing the tire's durability and maintaining structural integrity under load, while maintaining economical construction and minimizing rolling resistance.
Implementation Method 1
By using the same rubber material during the vulcanization of the tire blank, the different layers can be bonded together more effectively
Implementation Method 2
This prevents the two layers containing reinforcing elements from lying directly on top of each other, thus preventing the reinforcing elements of both layers from coming into direct contact. The durability of the pneumatic tire is improved.
Data Source
Figure 1
AI summary
The invention relates to a vehicle pneumatic tyre comprising belt plies (2a, 2b), two bead regions (5) comprising a bead core (7) and an apex (8), comprising at least one radially oriented carcass ply (3) having reinforcements. The carcass ply (3) runs through the tyre from bead region (5) to bead region (5), and the carcass ply (3) surrounds the bead regions (5) in each case from axially inside to axially outside and in each case ends in a carcass turnup (3a). Said tyre also comprises an additional reinforcement ply (9), which is disposed axially outside on the carcass ply (3), the radially inner end (10) thereof being disposed at the level of the bead region (5) and the radially outer end (11) being disposed below a belt ply (2a, 2b). The reinforcements of the belt plies (2a, 2b) and of the reinforcement plies (9) are disposed such that the reinforcements intersect the reinforcement plies of the carcass ply (3), and a rubber ply (15) is disposed between the carcass ply (3) and the additional reinforcing ply (9).