Pneumatic Tire Surface Fastener Intermittent Arrangement
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Solution Overview
Problem
Pneumatic tires with surface fasteners on the inner circumferential surface face disengagement issues due to weakened engagement force as the tire rolls, particularly in high aspect ratio tires, leading to functional objects falling off.
Innovation Solution
The tire features an intermittent arrangement of surface fastener members with a uniform cross-sectional dimension, band-like shape, and specific length and angle configurations to prevent disengagement, combined with a manufacturing method that integrates these fasteners into the tire's adhesive rubber layer during vulcanization molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface fastener members are arranged continuously or intermittently on the tire inner circumferential surface, then functional objects can be attached inside the tire, but the engagement force weakens as the tire rolls and disengagement may occur
Solution Approach 1:
The surface fastener members are divided into multiple discrete members arranged intermittently around the tire inner circumferential surface, rather than forming a continuous band. This segmentation allows each member to independently maintain engagement force while distributing the mechanical stress of tire deformation across multiple discrete points, preventing cumulative shear force buildup that leads to disengagement.
Solution Approach 2:
The surface fastener members are strategically positioned at specific locations on the tire inner circumferential surface where they can effectively engage with functional objects. The intermittent arrangement optimizes the distribution of engagement points to match the stress distribution patterns during tire rolling, enhancing local engagement reliability while reducing overall shear force exposure.
2Ease of operation
If the tire has a high aspect ratio causing great deflection at the tread portion, then the tire can provide comfortable riding, but the shear force from repeated deformation causes engaged loop members and hook members to disengage
Solution Approach 1:
By segmenting the surface fastener system into multiple discrete members, the patent isolates the engagement points from cumulative shear force effects. Each segmented fastener member experiences independent deformation cycles, preventing the progressive weakening that occurs in continuous fastener systems under high-deflection conditions.
Solution Approach 2:
The surface fastener members are pre-installed on the tire inner circumferential surface during the tire manufacturing process, before the tire enters service. This preliminary installation ensures proper positioning and initial engagement configuration that accounts for the tire's deformation characteristics, allowing the fasteners to maintain engagement despite subsequent rolling-induced deflections.
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 configuration ensures that engaged loop and hook members do not disengage, maintaining the attachment of functional objects even in tires with significant tread deflection, enhancing engagement force and durability.
Implementation Method 1
installing in advance surface fastener members on an adhesive rubber layer with intervals therebetween; and attaching the adhesive rubber layer to an inner surface of an innerliner layer
Data Source
AI summary
A pneumatic tire mounted with surface fastener members for attaching an object to a tire inner surface, comprises: at least eight surface fastener members having an intermittent arrangement on a tread inner circumferential surface, the surface fastener members having a uniform cross-sectional dimension, an overall band-like shape, and a length in a tire axial direction from 50% to 120% of a maximum belt width of the pneumatic tire; wherein an angle θ between a longitudinal direction of the surface fastener members and the tire axial direction is from 0 degrees to 45 degrees; and an installation period in a tire circumferential direction is from 80% to 150% of the length in the tire axial direction of the surface fastener members.