Run Flat Tire Side Reinforcing Rubber Composition
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Solution Overview
Problem
Run flat tires with side reinforcing rubber parts face reduced durability due to decreased rigidity at high temperatures, leading to increased stress on the bead part and potential separation between the bead filler and carcass ply, which compromises their ability to maintain performance during reduced air pressure conditions.
Innovation Solution
A run flat tire design featuring a side reinforcing rubber part with a specific rubber composition that maintains or increases tensile stress at high temperatures, combined with optimized vulcanization times for the bead filler and carcass ply to prevent separation, ensuring improved durability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high rigidity rubber is used in the side reinforcing rubber part to suppress deformation during run flat running, then the tire can maintain structural integrity, but the temperature of the side reinforcing rubber part increases during run flat running, causing rigidity to decrease and run flat durability to deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling the vulcanization conditions (temperature, time, and degree) of the side reinforcing rubber part to optimize its physical properties. By adjusting the vulcanization degree to a specific range, the rubber achieves optimal balance between rigidity at operating temperature and structural integrity, preventing both excessive deformation and overheating during run flat operation
Solution Approach 2:
The patent applies local quality by creating regional differences in vulcanization degree within the tire structure. The side reinforcing rubber part is given a specific vulcanization degree that differs from other parts of the tire, allowing it to maintain appropriate rigidity and thermal stability specifically where needed during run flat conditions
2Reliability
If rigidity of the side reinforcing rubber part is maintained at high temperature, then run flat durability is improved, but stress applied to the bead part increases during run flat running, causing separation between bead filler and carcass ply
Solution Approach 1:
The patent applies parameter changes by optimizing the vulcanization degree of the bead filler within a specific range (50-90%). This controlled parameter adjustment ensures the bead filler has sufficient flexibility to accommodate stress during run flat operation while maintaining adequate bond strength with the carcass ply, preventing separation despite increased stress
Solution Approach 2:
The patent applies dynamics by creating a gradient or variation in vulcanization degree within the bead filler material. This dynamic property distribution allows the bead filler to exhibit different mechanical characteristics at different locations, providing both stress absorption capability and bonding strength during run flat conditions
3Reliability
If the vulcanization rate difference between side reinforcing rubber part and inner liner layer is increased, then peeling between these layers is suppressed, but the overall vulcanization quality and run flat durability are compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the vulcanization degree of both the side reinforcing rubber part and inner liner layer within specific ranges. By adjusting vulcanization temperature and time parameters, the patent achieves optimal bonding between layers while maintaining overall vulcanization quality and run flat durability
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 suppresses deformation and separation issues, enhancing run flat durability while maintaining normal running performance by using a rubber composition with a specific M50H/M50N ratio and vulcanization time ratio, thereby improving the tire's ability to handle reduced air pressure conditions.
Implementation Method 1
a ratio (tb10/tp10) of 10% vulcanization time (tb10) at a vulcanization temperature of 160° C. of a rubber composition for the bead filler to 10% vulcanization time (tp10) at a vulcanization temperature of 160° C. of a rubber composition for the covering rubber of the carcass ply is from 0.5 to 1.0
Implementation Method 2
a ratio (tb10/tp10) of 10% vulcanization time (tb10) at a vulcanization temperature of 160° C. of a rubber composition for the bead filler to 10% vulcanization time (tp10) at a vulcanization temperature of 160° C. of a rubber composition for the covering rubber of the carcass ply is from 0.5 to 1.0
Data Source
AI summary
A run flat tire having a side reinforcing rubber part is disclosed. The side reinforcing rubber part is formed by a rubber composition having a ratio (M50H/M50N) of tensile stress (M50H) in 50% elongation at a measurement temperature of 100° C. to tensile stress (M50N) in 50% elongation at a measurement temperature of 23° C. of from 1.0 to 1.3. Ratio (tb10/tp10) of 10% vulcanization time (tb10) at a vulcanization temperature of 160° C. of a rubber composition for a bead filler to 10% vulcanization time (tp10) at a vulcanization temperature of 160° C. of a rubber composition for a covering rubber of a carcass ply is from 0.5 to 1.0.