Pneumatic Tire Load Support Layer and Turn-Up Reinforcement
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Solution Overview
Problem
Conventional runflat tires face challenges in maintaining durability and riding comfort while supporting load during deflation, with existing super-high turn-up structures prone to damage and peeling, and lacking efficient heat dissipation.
Innovation Solution
A pneumatic tire design featuring a load support layer made of crosslinked rubber with high hardness, positioned between the tread and beads, and a carcass ply turned up around a core with a laminated turn-up portion, along with dimples on the sidewall for enhanced heat dissipation, to support load and maintain stability during deflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a super-high turn-up structure is used in the carcass, then the tire can run for a longer period when deflated, but the turn-up portion is prone to damage and peeling
Solution Approach 1:
The invention uses a composite structure combining the carcass ply with a reinforcing filler layer. The carcass ply provides the basic structural support, while the reinforcing filler layer (made of rigid or semi-rigid material) strengthens the turn-up portion specifically, preventing damage and peeling without compromising the extended runflat capability.
Solution Approach 2:
The reinforcing filler layer is applied locally only to the turn-up portion of the carcass ply, rather than throughout the entire carcass. This localized reinforcement targets the specific area prone to damage while maintaining the overall flexibility and runflat performance of the tire.
2Strength
If the turn-up portion is extended radially outward, then load support capability is improved, but heat generation increases
Solution Approach 1:
The reinforcing filler layer incorporates voids or porous structures that facilitate heat dissipation. This porous configuration allows heat to escape from the turn-up portion, reducing temperature buildup while maintaining the structural load support capability provided by the reinforced carcass structure.
3Reliability
If a reinforcing filler layer is added between the bead apex and carcass ply, then durability is improved, but device complexity increases
Solution Approach 1:
The reinforcing filler layer is incorporated into the tire structure during the manufacturing process, before the tire enters service. This preliminary integration ensures the reinforcement is already in place to prevent damage, while the materials and methods are selected to minimize added complexity in the overall tire construction.
Data Source
AI summary
A pneumatic tire includes a tread, sidewalls extending from edges of the tread, clinches extending from the edges of the sidewall, beads positioned on axially inner side of the clinches, a carcass bridging the beads along inner side of the tread and sidewalls, and load support layers positioned on axially inner side of the carcass such that the layers are positioned between the tread and beads. Each bead includes core and main apex, the core has radially outer side surface facing radially outward, the carcass includes carcass ply turned up around the core from inner side toward outer side in axial direction of the tire such that the main portion and turn-up portion are formed in the ply, the turn-up portion has core laminating portion laminated on the radially outer side surface of the core, and the apex is extending radially outward from radially outer side of the laminating portion.