Vehicle Bush Force Detection via Elastic Projections
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Solution Overview
Problem
Existing methods for detecting component forces in vehicle suspension systems, particularly at movable connecting portions like shafts, are inaccurate due to reliance on predicted calculations and difficulty in measuring force distribution on bushings with varying elastic properties.
Innovation Solution
A bush component force detection device featuring a cylindrical sensing unit with elastically deformable outer and inner projections and strain gauges, allowing direct and accurate measurement of component forces acting on bushings by maintaining a space between the sensing unit and the bushing hole, thereby minimizing deformation and preventing strain gauge contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is mounted on a damper or arm member to measure suspension behavior, then measurement can be performed, but the behavior of the shaft cannot be measured accurately because calculation based on sensor results only gives predicted values
Solution Approach 1:
A sensing unit is introduced as an intermediary component between the bushing and the mounting member. This sensing unit directly detects the component force acting on the bushing through elastic deformable projections, providing accurate measurement without relying on calculation from other locations. The sensing unit serves as a mediator that transfers the force information directly to the strain gauges.
Solution Approach 2:
The sensing unit is divided into separate functional components: outer-side projections for contact with the mounting member, inner-side projections for contact with the bushing, and strain gauges for detection. This segmentation allows each component to perform its specific function optimally, with the projections handling force transmission and the strain gauges handling measurement.
2Volume of moving object
If the sensing unit is placed too close to or in contact with the bushing hole, then the structure becomes compact, but deformation occurs and strain gauges may contact the hole causing measurement errors
Solution Approach 1:
The elastic deformable projections act as intermediaries between the sensing unit and the bushing/mounting member interfaces. These projections transmit the component force to the sensing unit body without requiring direct contact between the sensing unit and the bushing hole, preventing deformation and strain gauge contact while maintaining force transmission accuracy.
Solution Approach 2:
The sensing unit utilizes elastic deformation of the projections as a functional parameter. The projections are designed to deform elastically under load, converting the component force into a measurable displacement that the strain gauges can detect, while the main body of the sensing unit remains sufficiently rigid to avoid unwanted deformation.
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 precise detection of component force distribution on vehicle suspension bushings, improving the accuracy of suspension behavior analysis and enhancing riding comfort and driving stability.
Implementation Method 1
a cylinder 151 which is inserted into the hole 61a with predetermined space therefrom and has strain gauges 151a to 151d
Implementation Method 2
elastically deformable outer-side projections 140 that extend in an axial direction of the cylinder 151 and project radially outward from an outer surface of the cylinder 151; and elastically deformable inner-side projection 130 that extend in an axial direction of the cylinder 151 and project radially inward from an inner surface of the cylinder 151
Data Source
AI summary
A bush component force detection device detects a component force acting on a bush which is press-fitted into a hole provided in a frame of a vehicle. The bush component force detection device includes: a cylinder which is inserted into the hole with predetermined space therefrom and has strain gauges; elastically deformable outer-side projections that extend in an axial direction of the cylinder and project radially outward from an outer surface of the cylinder; and elastically deformable inner-side projections that extend in an axial direction of the cylinder and project radially inward from an inner surface of the cylinder.