Tyre Mounting Shoe Geometry for Tight Tubeless Rim Beads
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tools for installing and removing bicycle tyres from wheel rims require significant force, often leading to damage or difficulty, especially with modern tubeless tyres and 'hookless' rims, and are inconvenient for roadside repairs.
Innovation Solution
A tool with a shoe and handle design that applies a radially outward force to the tyre bead, combined with a removal hook for prising the bead over the rim edge, providing mechanical advantage and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional tyre levers are used to install or remove tubeless tyres, then the tool can engage with the rim, but the tight fit between bead and rim requires excessive force that can damage the tube, break the tool, or cause the tool to disengage and fly off
Solution Approach 1:
The tool incorporates a flexible blade that can bend and deform under load, allowing it to adapt to the tight fit between tyre bead and rim while distributing force more evenly. The blade's ability to flex prevents sudden breakage or disengagement, maintaining reliability under high-force conditions.
Solution Approach 2:
The tool introduces an intermediary mechanism (the specially designed blade with toe and shoulder portions) between the user's manual force and the tyre bead-rim interface. This intermediary distributes and controls the force application, preventing both tool failure and tube damage while maintaining secure engagement.
2Ease of manufacture
If standard tyre tools are used on modern tubeless tyres with tight bead-to-rim fit, then the tool can engage the rim, but the excessive force required can damage the tube or break the tool
Solution Approach 1:
The blade features localized functional zones: a toe portion for initial engagement and force application, a shoulder portion for supporting the tyre bead, and a flexible mid-section. Each zone is optimized for its specific function, allowing force distribution that prevents tube and tool damage while facilitating easy installation.
Solution Approach 2:
The tool's blade is designed with varying thickness and flexibility parameters along its length, creating a gradient of mechanical properties. The thinner, more flexible toe section allows controlled deformation under load, while the thicker shoulder section provides structural support, preventing both tool breakage and tube damage.
3Ease of operation
If a tool is designed to address the issues of tight tyre fits and tool disengagement, then reliability and ease of operation improve, but the tool size increases making it less portable for roadside repairs
Solution Approach 1:
The tool integrates multiple functional elements (toe portion, shoulder portion, flexible blade, handle) into a compact, nested structure. The blade can be stored within or alongside the handle when not in use, and the various functional zones are arranged along the blade's length to maximize functionality within minimal overall dimensions, maintaining portability for roadside repairs.
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
Facilitates easy installation and removal of tyres without damage, even on tight fits, and allows for compact, portable use.
Implementation Method 1
advancing the shoe in the circumferential direction toward the cross-over point applies a radially outward force to the bead
Implementation Method 2
the shoulder portion urges the bead in the direction from outside the wheel rim to inside the wheel rim
Implementation Method 3
a body, connected to the removal hook, providing a handle portion, for urging the removal hook to prise a portion of the bead of the tyre over the radially outer edge of the wheel rim
Data Source
Figure 1~4
Figure 5~7
Figure 8~10
AI summary
A tool for installing a tyre onto a wheel rim, the tool comprises: a shoe, and a body, connected to the shoe, providing a handle portion. The shoe comprises: a first surface for contacting an inner portion of the side wall of the wheel rim; a second surface for contacting the radially outer edge of the wheel rim; a toe portion projecting beyond the leading edge of the second surface in the circumferential direction of the wheel rim and continuing the first surface in the circumferential direction of the wheel rim; and a shoulder portion. When installing a tyre on a wheel rim, at the cross-over point where the bead of a partially installed tyre crosses from outside the wheel rim to inside the wheel rim, the first surface and second surface are contactable with the inner portion of the side wall and radially outer edge of the wheel rim, respectively, with the toe portion projecting underneath the bead of the tyre at the cross-over point along the inner side wall of the rim. In this state, advancing the shoe in the circumferential direction toward the cross-over point applies a radially outward force to the bead, and the shoulder portion urges the bead in the direction from outside the wheel rim to inside the wheel rim.