Tire Bead Guide Rotation for Rim Mounting
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Solution Overview
Problem
Existing tire mounting devices often damage tire beads due to steps on the wheel's outer-circumferential surface, as the bead guide or guide plate can catch the bead, especially when the bead is not smoothly sliding over the surface.
Innovation Solution
A tire mounting device with a bead guide that includes a columnar portion and a plate-like guide plate, which can be rotated to switch between positions, allowing the guide plate to protrude radially outward and enter below the tire bead, ensuring it is not caught by steps on the wheel's surface, and a roller to press the bead onto the rim.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bead guide or guide plate contacts the tire bead during mounting, then the bead can be guided onto the rim, but the bead may be caught by steps on the wheel surface causing damage
Solution Approach 1:
A smooth guide surface is introduced as an intermediary between the tire bead and the wheel flange. This guide surface, which can be a guide plate or the smoothed outer-circumferential surface, mediates the contact interaction, allowing the bead to slide smoothly without direct contact with problematic steps on the wheel, thereby preventing bead damage while still enabling proper positioning
Solution Approach 2:
The wheel flange outer-circumferential surface is preliminarily processed to create a smooth guide surface before the tire mounting operation. By pre-smoothing or pre-finishing the surface where the bead will slide, the harmful steps are eliminated in advance, preventing potential bead damage before the mounting process begins
2Ease of operation
If a guide plate is used to guide the tire bead, then the bead can be directed to the outer circumferential position, but the guide plate may catch the bead if it cannot enter the gap between the wheel surface and bead
Solution Approach 1:
The guide plate is designed to operate in a different dimensional space by positioning itself between the wheel flange and the tire bead. Rather than trying to push the bead from the outside, the guide plate enters the gap dimension between the wheel surface and bead, providing guidance from within this intermediate space, which eliminates the catching problem
3Device complexity
If the outer-circumferential surface of the wheel is used as the guide surface, then the structure is simple, but steps on this surface can catch the bead causing damage
Solution Approach 1:
Instead of requiring the entire wheel flange surface to be perfectly smooth, only the specific local region where the bead contacts during mounting is smoothed or finished to a high quality. This localized surface treatment creates a smooth guide path exactly where needed, preventing bead damage from steps in the critical contact zone while maintaining simplicity elsewhere in the wheel structure
Data Source
Figure 1
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Figure 5
AI summary
A bead guide (50) includes a columnar portion (51) having a cylindrical side surface, and a guide plate (52) extending from a distal end of the columnar portion (51). Through rotation of the bead guide (50), an expansion bar rotation driving section (41) selectively switches the bead guide (50) between a first position at which the guide plate (52) is retreated radially inwardly from an outer circumferential end of a wheel (H), and a second position at which at least a part of the guide plate (52) protrudes radially outwardly from the outer circumferential end of the wheel (H). The bead guide (50) is switched from the first position to the second position so that the guide plate (52) is caused to enter below an upper bead (TBU).