Unvulcanized Bead Core for Tire Assembly
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Solution Overview
Problem
Conventional pneumatic vehicle tire bead cores have high flexural rigidity, leading to damage during assembly and disassembly due to their high circumferential and torsional rigidity, which complicates mounting and removing the tire from the rim.
Innovation Solution
The tire bead core features an unvulcanized and non-crosslinked rubber coating for individual steel cords in the inner area, allowing for circumferential movement, while the outer edge is connected with a cross-linked rubber mixture for secure attachment, reducing flexural rigidity and maintaining sufficient circumferential and torsional rigidity through strategic cross-linking and wire core clamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bead core is made with high circumferential and torsional rigidity to ensure firm seating on the rim, then the tire sits securely on the rim, but the flexural rigidity becomes too high causing damage during assembly and disassembly
Solution Approach 1:
The patent applies local quality by differentiating the rubber coating properties between the inner area and outer edge region of the bead core. The inner area uses unvulcanized, non-crosslinked rubber coating to provide flexibility for assembly/disassembly, while the outer edge region uses cross-linked rubber coating to ensure secure connection to bead components and firm seating on the rim.
Solution Approach 2:
The bead core is segmented into two functional zones: an inner area with movable steel cord wires and unvulcanized rubber coating for flexibility, and an outer edge region with cross-linked rubber coating for secure attachment. This segmentation allows each zone to perform its specific function optimally.
2Strength
If the rubber coating is made cross-linked to ensure secure connection to bead components, then the connection strength is sufficient, but the flexural rigidity increases making assembly difficult
Solution Approach 1:
The patent applies local quality by differentiating the rubber coating properties between the inner area and outer edge region of the bead core. The inner area uses unvulcanized, non-crosslinked rubber coating to provide flexibility for assembly/disassembly, while the outer edge region uses cross-linked rubber coating to ensure secure connection to bead components and firm seating on the rim.
Solution Approach 2:
The bead core is segmented into two functional zones: an inner area with movable steel cord wires and unvulcanized rubber coating for flexibility, and an outer edge region with cross-linked rubber coating for secure attachment. This segmentation allows each zone to perform its specific function optimally.
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
This design significantly reduces the risk of tire bead damage during assembly and disassembly, ensuring easier mounting and removal while maintaining secure attachment to the rim, enhancing the tire's assembly capability and overall durability.
Implementation Method 1
the rubber coating of the individual steel cords in the inner area of the bead core is essentially unvulcanized and essentially non-crosslinked due to a lack of vulcanizing agent, whereby the individual steel cord wires in the inner area of the bead core are circumferentially movable relative to one another
Implementation Method 2
the outer edge region of the bead core being connected to the adjacent tire bead components by a cross-linked rubber mixture
Data Source
Figure 1~2
AI summary
The invention relates to a pneumatic vehicle tire having a bead having a core and a core profile. The invention relates to a pneumatic vehicle tire, wherein the bending strength of the bead in respect of assembly and removal of the vehicle tire is improved in that the rubber coating of the individual steel cord wires (5) in the inner region of the bead core (3) is substantially unvulcanized and substantially uncured due to a lack of vulcanization means, wherein the individual steel cord wires (5) in the inner region of the bead core (3) are designed to be movable against each other in the circumferential direction and the tire bead (1) overall has a reduced bending strength in comparison to conventional pneumatic vehicle tires, wherein the outer edge region (6) of the bead core (3) is connected to the adjacent tire bead components by a cured rubber mixture.