Wheel Bearing Displacement Sensing for Lateral Force Detection
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Solution Overview
Problem
Conventional bearing units for vehicles have limitations in accurately detecting axial displacements caused by lateral forces, leading to potential inaccuracies in calculating the forces acting on wheels, which can affect vehicle stability and control.
Innovation Solution
A detection device with a disk-shaped rotating section and a displacement detection section positioned radially outward from the bearing, allowing for increased axial displacement detection accuracy by positioning the detection section away from the bearing, enhancing the calculation of lateral forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the displacement detection section is positioned close to the bearing, then the device complexity is reduced, but the measurement precision of axial displacement deteriorates
Solution Approach 1:
The patent extends the detection system into the radial dimension by positioning the detection section radially outward from the bearing. This dimensional extension allows the detection section to be located at a position where it can effectively measure axial displacement without being constrained by the compact space near the bearing, thereby resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent introduces a rotating section as an intermediary component that connects the bearing to the displacement detection section. This intermediary structure transmits the axial displacement from the bearing to the detection section, enabling accurate measurement while allowing the detection section to be positioned at an optimal location for measurement precision
2Measurement precision
If the detection section is positioned radially outward from the bearing, then the measurement precision of axial displacement is improved, but the device complexity increases
Solution Approach 1:
The rotating section serves multiple functions: it rotates with the bearing to track axial displacement, transmits mechanical motion to the detection section, and provides a mounting structure for the detection components. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity while achieving improved measurement precision
3Measurement precision
If the rotating section extends radially outward, then the amplitude of output signals in response to axial displacements is increased, but the volume of the detection device is increased
Solution Approach 1:
The detection section is positioned at a specific radial location where it can effectively detect axial displacement with sufficient signal amplitude. By concentrating the detection function at this optimal local position rather than extending the entire device radially, the patent achieves high signal amplitude while limiting the overall volume increase of the detection device
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 solution improves the accuracy of displacement detection and subsequent calculation of lateral forces, thereby enhancing vehicle stability and control by increasing the amplitude of output signals in response to axial displacements.
Implementation Method 1
a displacement detection section that is disposed in a non-contact state with the rotating section for detection
Data Source
AI summary
A detection device for vehicles includes a base section fixed to a body of a vehicle, and a bearing having an outer ring member, an inner ring member, and rolling elements, which rotatably supports a wheel of the vehicle against the base section. A first bearing member of the outer ring member and the inner ring member is fixed to the wheel, and a second bearing member of the outer ring member and the inner ring member is fixed to the base section. The detection device includes a disk-shaped rotating section for detection that extends radially outward of the bearing with respect to the first bearing member, and a displacement detection section that outputs a signal in response to an axial displacement of the rotating section for detection.