Wheel Bearing Preload Inspection Using Multi-Speed Power Difference
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Solution Overview
Problem
Existing preload inspection methods for vehicle wheel bearing devices lack accuracy in calculating preload values, which is critical for determining the acceptable preload state, especially with increasing demands for lower fuel consumption and higher precision.
Innovation Solution
A preload inspection method involving power calculation steps at multiple rotation speeds, followed by preload value calculation using differences in power and reciprocal of power differences, and acceptance determination based on these values within allowable ranges, reduces the influence of assembly process and environmental changes, and incorporates established relationships between power differences and preload values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional preload inspection method is used, then preload value can be calculated, but calculation accuracy is insufficient for low fuel consumption requirements
Solution Approach 1:
The invention changes the measurement parameters by measuring power at multiple rotation speeds (at least two different speeds) instead of a single speed. This parameter change enables more accurate preload calculation through the relationship between power difference and preload, directly resolving the contradiction by providing the necessary measurement precision for low fuel consumption applications.
2Measurement precision
If single rotation speed power measurement is used, then inspection process is simple, but preload value calculation accuracy is insufficient
Solution Approach 1:
The invention introduces parameter changes by measuring at multiple rotation speeds and utilizing the power difference relationship. This approach achieves high measurement precision while maintaining reasonable process complexity through the established mathematical relationship between power difference and preload value.
Solution Approach 2:
The invention replaces complex mechanical measurement systems with a power-based measurement approach. By measuring power at different rotation speeds and calculating preload from the power difference, the system achieves accurate preload inspection without requiring complex mechanical apparatus.
3Reliability
If conventional inspection method is used, then inspection can be performed, but accuracy is affected by assembly process variations and environmental changes
Solution Approach 1:
The invention implements feedback by measuring power at multiple rotation speeds and using the power difference to calculate preload. This feedback mechanism compensates for assembly process variations and environmental changes, as the differential measurement approach cancels out common-mode errors and provides reliable acceptance determination.
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
This method enables more accurate calculation of preload values and improved acceptance determination, reducing the impact of individual differences and environmental factors, thus ensuring higher precision in assessing the preload state of vehicle wheel bearing devices.
Implementation Method 1
resistance is generated against rotation of the wheel
Data Source
AI summary
A preload inspection method with which a preload value can be calculated more accurately. The preload inspection method for a wheel bearing device provided with an outer member having an outside raceway surface, an inner member having an inside raceway surface, and rolling bodies, is provided with: a power calculation step in which the outer member or the inner member is rotated in a relative manner and the power is calculated; a preload value calculation step in which a preload value is calculated on the basis of the power calculated in the power calculation step; and a pass/fail determination step is made on the basis of whether the preload value calculated in the preload value calculation step is within a permissible range.