Wheel Beadlock Clamping for Low-PSI Tire Retention
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Solution Overview
Problem
Existing tire securing mechanisms face stress issues due to angularity errors and lack of leverage, leading to potential bolt failure and tire slippage, especially in racing and off-road applications where high stress and low psi tires are common.
Innovation Solution
A bolt with a ball seat that allows the bead ring to pivot around it, leveraging a fulcrum on the wheel to secure the tire bead, combined with a safety bead and surface finish to prevent rotational slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional bolt is used to clamp the tire bead bundle between the bead ring and wheel, then the tire can be secured to the wheel, but the bolt is subjected to high stress due to joint face angularity that can cause bolt failure
Solution Approach 1:
The bead ring is designed to pivot dynamically during the tightening process. The elongated pilot hole allows the bead ring to rotate and self-align as the bolt is tightened, transforming the static rigid connection into a dynamic adaptive connection that accommodates angularity errors without transmitting stress to the bolt
Solution Approach 2:
The invention changes the geometric parameter of the pilot hole from circular to elongated. This parameter change enables the bead ring to pivot and self-align during tightening, accommodating joint face angularity errors and preventing stress concentration on the bolt that would lead to bolt failure
2Reliability
If the bead ring is tightened against the wheel to secure the tire, then the tire bead is clamped securely, but the bolt head may only partially contact the bead ring causing asymmetric stress and potential bolt breaking
Solution Approach 1:
The bead ring pivots dynamically during tightening to self-align with the wheel face, ensuring full contact between the bead ring and wheel surface. This dynamic adjustment eliminates the need for precise manual alignment and prevents partial contact scenarios that cause asymmetric stress on the bolt
Solution Approach 2:
The bead ring performs self-alignment through pivoting motion enabled by the elongated pilot hole. This self-service mechanism automatically compensates for angularity errors and ensures proper contact geometry without requiring external adjustment or precise installation procedures
3Ease of operation
If low psi tires are used in racing applications, then the tire can be mounted more easily, but the tire may move inward from the inner rim or slip rotationally around the wheel
Solution Approach 1:
The safety bead and surface roughness treatment are pre-applied to the wheel before tire installation. These preliminary features create friction and mechanical interference that prevent tire slippage and inward movement, allowing low psi tires to be used safely without compromising position stability during acceleration and deceleration
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 solution reduces bolt stress, enhances tire security, and prevents tire slippage and failure by distributing force evenly and maximizing friction, thereby ensuring a stable tire-wheel interface under various conditions.
Implementation Method 1
The area between the safety bead and the outer lip of the wheel (tire bead seat area) receives a measured (RA) surface roughness finish process to achieve the maximum co-efficient of rubber to aluminum that prevents the wheel from slipping rotationally inside the tire
Data Source
AI summary
An improved clamping mechanism to secure a tire between a bead ring and a wheel utilizing a bolt is provided. The bolt has a ball seat that pivots within an enlarged pilot hole in the bead ring as the bolt threads engage in threaded section of the wheel, pulling the bead ring toward the wheel. As the bead ring is tightened upon the wheel, eventually the bead ring contacts a fulcrum on the wheel, at which point the outer edge of the bead ring is leveraged against the tire bead bundle and pressing down the tire bead to lock it in place against the wheel. As the bead ring can pivot within the enlarged pilot hole around the bolt, the bolt is not stressed. Further, the wheel comprising a safety bead and non-skid coating on the inner wall of the wheel to prevent the wheel sliding around the wheel.