Tyre Changer Roller Force Variation Measurement
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Solution Overview
Problem
Existing tyre changers fail to effectively detect non-uniformities in wheel/tyre assemblies, which can lead to vehicle vibrations, tumbling motions, and poor running performance.
Innovation Solution
A tyre changer with a mounting device, roller, and sensor system that applies a predefined force to the peripheral surface of the wheel/tyre assembly, measuring force variations using sensors like strain gauges or piezoelectric sensors to assess radial and axial forces, and analyzing these to determine uniformity or non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tyre changer is equipped with a roller to apply force to the tyre peripheral surface, then the ability to detect non-uniformities is improved, but the device complexity increases due to additional sensor devices and control systems
Solution Approach 1:
The roller serves dual functions: it applies controlled force to the tyre peripheral surface during normal tyre changing operations, and simultaneously acts as a measurement point for detecting force variations that indicate non-uniformities. This multi-functionality allows the system to gain measurement capabilities without adding separate dedicated measurement components.
Solution Approach 2:
The roller acts as an intermediary element between the tyre and the measurement system. By measuring the force variations at the roller-tire contact point, the system indirectly detects non-uniformities in the tyre structure, converting complex internal tyre properties into measurable external force variations.
2Measurement precision
If force variations are measured using sensor devices, then the detection accuracy of wheel/tyre non-uniformity is improved, but the manufacturing cost increases
Solution Approach 1:
Existing structural components of the tyre changer (roller, mounting device, pillar) are repurposed to serve as measurement platforms. The roller's mechanical structure becomes part of the measurement system, eliminating the need for completely separate expensive measurement apparatus and reducing overall manufacturing costs.
Solution Approach 2:
The tyre changer system performs self-diagnosis by using its own operational components (roller applying force during normal operation) to detect non-uniformities. The system leverages its own operational forces and structures to generate measurement data, reducing the need for additional dedicated measurement infrastructure.
3Reliability
If the roller applies a predefined force to the peripheral surface, then the measurement reliability is improved, but the control system complexity increases
Solution Approach 1:
The control device receives feedback from sensors about the actual force applied by the roller and adjusts the roller's position or applied force to maintain the predefined force level. This feedback mechanism ensures consistent measurement conditions while allowing the control system to adapt to variations in tyre properties.
Solution Approach 2:
Instead of maintaining a completely rigid fixed force application system, the control device allows dynamic adjustment of measurement parameters (such as roller position, applied force magnitude) to optimize measurement conditions for different tyre types and conditions, improving reliability across varied scenarios.
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 system accurately detects force variations, preventing non-uniformities that cause vehicle instability and improving running performance by ensuring the wheel/tyre assembly meets manufacturer-defined force limits.
Implementation Method 1
measuring force variations acting between a peripheral surface of a wheel/tyre assembly and a roller
Implementation Method 2
measuring force variations acting between a peripheral surface of a wheel/tyre assembly and a roller
Data Source
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AI summary
The invention relates to a tyre changer comprising a mounting device (18) for receiving a wheel/tyre assembly, the mounting device (18) having an axis (S), a roller (26) being able to contact a peripheral surface of the wheel/tyre assembly, the roller (26) applying a force to the peripheral surface, a control device (32) for controlling the predefined force applied by the roller (26) to the peripheral surface during a rotation of the wheel/tyre assembly about the axis (S) and a sensor device (30) measures force variations acting between the peripheral surface and the roller (26), wherein supports (20, 22) of the roller (26) and of the mounting device (18) are designed for a relative movement of the roller (26) and of the mounting device (18) towards each other along a straight line to apply a predetermined force to the peripheral surface. Furthermore, the invention relates to a method of measuring force variations acting between a peripheral surface of a wheel/tyre assembly and a roller (26).