Bicycle Tire Bead Structure for High-Load Rigidity
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Solution Overview
Problem
Bicycle tires, particularly those used in electric bicycles and off-road bicycles, experience substantial torsional, longitudinal, lateral, and vertical deformations under high loads, affecting performance in acceleration, braking, handling, and safety due to insufficient rigidity.
Innovation Solution
The tire design incorporates an elastomeric material filler positioned radially outer to the bead core and axially between the carcass plies, anchored by a loop that extends around the bead core to prevent sliding and enhance rigidity, with a bead core to bead core ply providing additional support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tyre uses conventional carcass structure without additional filler, then the device complexity is low, but the rigidity (vertical, torsional, lateral, longitudinal) is insufficient under high loads
Solution Approach 1:
The elastomeric material filler is nested within the tyre structure, positioned between the bead core and the carcass plies. This nested configuration allows the filler to be integrated into the existing tyre architecture without adding external components, thereby increasing rigidity while minimizing structural complexity
Solution Approach 2:
The invention introduces an elastomeric material filler with specific properties (different from the surrounding tyre materials) to create a composite structure. This composite approach combines the bead core, filler, and carcass plies to achieve enhanced rigidity characteristics that cannot be obtained with conventional homogeneous tyre structures
2Strength
If the elastomeric material filler is not anchored to the bead core, then the ease of manufacture is high, but the rigidity enhancement is insufficient due to sliding between filler and bead core
Solution Approach 1:
The anchoring mechanism is designed to be pre-integrated into the tyre structure during manufacturing. The elastomeric material filler is positioned and anchored to the bead core before the final tyre assembly is completed, ensuring proper alignment and connection without requiring complex post-assembly operations
Solution Approach 2:
The elastomeric material filler itself acts as a flexible anchoring element that can conform to the bead core geometry and provide secure attachment. The flexible nature of the elastomeric material allows it to be effectively anchored to the bead core while maintaining the ability to accommodate tyre deformation during use
Data Source
Figure 1
Figure 1A
Figure 2~3
AI summary
A bicycles tyre (100) comprises a pair of bead cores (8), a carcass structure (2) turned around the pair of bead cores (8) and a tread band (4) radially outer to the carcass structure (2); at each bead core (8) being provided: an elastomeric material filler (12) which extends in a radial direction for a first length (H1) starting from the bead core (8), a loop (15) interposed between the carcass structure (2) and the elastomeric material filler (12), turned around the bead core (8) so as to define a first flap (15a) axially outer to the elastomeric material filler (12) and a second flap (15b) axially inner to the elastomeric material filler (12), wherein the first flap (15a) extends in a radial direction for a second length (H2) and the second flap (15b) extends in a radial direction for a third length (H3). A bead core to bead core ply (14) is placed radially outside the carcass structure (2) and radially inside the tread band (4).