Tire Bead Pre-stretching for Safer Rim Mounting
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Solution Overview
Problem
Existing methods for mounting motor vehicle tires on rims require high forces or torques, leading to potential injuries and twisting of tire beads, and there is a need for a more efficient and safer process.
Innovation Solution
A method and device for pre-stretching tire beads before mounting, using motorized clamping means distributed over the tire's circumference to introduce expansion forces uniformly, allowing the tire beads to be stretched before being pulled over the rim, thereby reducing the risk of injury and twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high forces or torques are applied to pull the tire beads over the rim flanges during mounting, then the tire can be mounted on the rim, but the tire beads may suffer injuries or twisting
Solution Approach 1:
The patent applies preliminary action by pre-stretching the tire beads before the actual mounting process. The bead stretching device expands the beads to a larger diameter beforehand, making them more compliant and easier to fit over the rim flanges during subsequent mounting operations, thereby reducing the forces needed and preventing bead injuries
Solution Approach 2:
The patent changes the physical parameter of the tire bead by altering its diameter through mechanical expansion. The bead stretching device increases the bead diameter from its original size to a larger expanded size, changing the bead's physical state to make it more suitable for the mounting process and reducing stress during installation
2Reliability
If a separate pre-stretching device is added to the tire assembly process, then bead injuries and twisting are reduced, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the bead stretching device to perform multiple functions: it stretches both tire beads, can operate in conjunction with various mounting devices, and can be integrated into different assembly system configurations (fully automatic or semi-automatic), thereby reducing bead injuries without proportionally increasing overall system complexity
Solution Approach 2:
The patent applies segmentation by separating the bead stretching function from the mounting function into distinct operational stages. The bead stretching device operates as an independent preliminary step before mounting, allowing each function to be optimized separately while maintaining overall system efficiency and manageable complexity
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
The pre-stretching process facilitates easier tire mounting, reduces bead injuries and twisting, and can be integrated into both manual and fully automated tire assembly systems, ensuring safer and more efficient tire fitting.
Implementation Method 1
clamping means (12) which can be moved radially further outwards... in order to pre-stretch a tire bead (16) resting on the clamping means (12) by introducing expansion forces into the tire bead (16) in a targeted manner
Data Source
Figure 1
AI summary
A method, device, and installation for mounting a motor vehicle tire on a rim of a wheel, characterized in that at least one tire bead of the motor vehicle tire is prestretched in a targeted manner before the tire is pulled onto the rim, in particular before the tire beads are pulled over the rim flanges of the rim.