Measuring Rim Strain Gauges Tire Mounting Force Field
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Solution Overview
Problem
Conventional methods for measuring the force field during tire mounting are inadequate, as they can only measure specific force components indirectly and require destructive testing, which is costly and prone to further damage, and are not feasible for real-time monitoring.
Innovation Solution
A measuring rim equipped with strain gauges and an optically detectable surface structure that measures strain components during tire mounting, allowing for wireless data transmission to an evaluation unit, enabling the determination of the entire force field acting on the tire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional indirect measurement methods are used to measure force components during tire mounting, then the measurement system is simple, but only specific force components can be measured and the entire force field cannot be determined
Solution Approach 1:
The patent uses the rim as an intermediary object to measure forces. Instead of directly measuring forces on the mounting device, strain gauges are attached to the rim to detect strains caused by forces during tire mounting. This intermediary approach allows comprehensive force field measurement while keeping the system relatively simple.
Solution Approach 2:
The patent replaces direct mechanical force measurement with strain measurement. By attaching strain gauges to the rim, the system converts force measurement into electrical signal measurement, enabling comprehensive force field determination without complex mechanical sensor arrangements.
2Measurement precision
If destructive testing methods are used to determine the force field after tire assembly, then the entire force field can be determined, but the tire is destroyed and cannot be reused
Solution Approach 1:
The patent performs measurements during the tire mounting process itself, before the tire is fully assembled and before any destructive testing would occur. Strain gauges on the rim record forces in real-time during mounting, eliminating the need for subsequent destructive testing.
Solution Approach 2:
The rim serves a dual function: it is both the component that holds the tire during mounting and the measurement platform. The rim's own structural response (strains) during normal mounting operations provides the measurement data, eliminating the need for separate destructive testing procedures.
3Measurement precision
If multiple force sensors are distributed in the tire to record the force field along the entire tire, then comprehensive force measurement is achieved, but the cost increases significantly and sensor arrangement becomes very difficult
Solution Approach 1:
The patent extracts the measurement function from the tire itself and places it on the rim. Instead of embedding multiple sensors within the tire structure (which is difficult and expensive), strain gauges are attached to the external rim surface, greatly simplifying the measurement system while still capturing comprehensive force field information.
Solution Approach 2:
The rim serves multiple functions: it holds the tire during mounting, withstands the mounting forces, and acts as the measurement platform. This multi-functionality eliminates the need for separate sensor distribution within the tire, reducing both cost and complexity.
4Measurement precision
If tire removal from rim is performed to examine the tire for force assessment, then the tire can be examined, but dismounting can lead to further damage and clear assessment of loading conditions is not possible
Solution Approach 1:
The patent continues the measurement process throughout the entire mounting operation without interruption. Forces are measured continuously during tire mounting on the rim, eliminating the need to remove the tire for examination and avoiding any additional damage from dismounting operations.
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
Enables objective evaluation of tire mounting devices by quantitatively recording mechanical stress on the tire and rim, ensuring safe and damage-free assembly, and providing real-time data for assessing the suitability of tire assembly machines.
Implementation Method 1
strain gauges for detecting the strain component that occurs when the tire is fitted
Data Source
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AI summary
A measuring rim for detecting at least one strain component caused by a mounting device during tire mounting is disclosed. The measuring rim comprises a rim bed (110) bounded by a rim flange (111, 112) and designed to hold a tire (50); and strain measuring means (121; 122) for detecting the strain component that occurs during tire mounting.