Inertial Sensor Offset Torsional Springs
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Solution Overview
Problem
Conventional inertial sensors experience significant mechanical stresses in torsion springs during vertical deflection, limiting the elongation of springs and increasing the risk of spring breakage due to their collinear disposition.
Innovation Solution
The inertial sensor design features springs with an offset from their longitudinal axes, allowing for increased length without mutual interference, thereby reducing mechanical stress and enhancing the sensor's ability to withstand vertical acceleration forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the springs are disposed collinearly with respect to their longitudinal axes, then the device complexity is reduced and manufacturing is simplified, but the spring length is limited and mechanical stress increases during vertical deflection
Solution Approach 1:
The patent transitions from a one-dimensional collinear arrangement to a two-dimensional offset arrangement of the springs. By positioning the longitudinal axes of the two springs parallel but offset from each other rather than collinear, the springs can extend further in the vertical direction without interfering with each other, thereby increasing spring length and reducing mechanical stress during vertical deflection.
Solution Approach 2:
The patent introduces asymmetry in the spatial arrangement of the springs by offsetting their longitudinal axes. Instead of symmetric collinear positioning, the springs are arranged with a lateral offset, creating an asymmetric configuration that allows greater vertical extension while maintaining structural balance through the parallel orientation of the longitudinal axes.
2Reliability
If the spring length is increased to reduce mechanical stress, then the spring can withstand greater vertical acceleration forces, but the collinear disposition causes the springs to act as mutually delimiting elements
Solution Approach 1:
By moving from a collinear one-dimensional arrangement to a parallel offset two-dimensional arrangement, the springs gain additional spatial freedom. This dimensional change eliminates the mutual delimiting effect that occurs in collinear configurations, allowing each spring to achieve its full potential length without being constrained by the other spring's position.
3Stress or pressure
If the springs are disposed with an offset from one another with reference to their longitudinal axis, then the spring length can be increased and mechanical stress reduced, but the device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by introducing a simple parallel offset arrangement that adds only one dimensional parameter (lateral offset distance) while maintaining the fundamental two-spring suspension structure. This dimensional change provides the mechanical benefits of reduced stress without requiring complex multi-component assemblies or intricate geometries.
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 design effectively minimizes mechanical stress in the springs during vertical overload, preventing spring breakage and enabling the inertial sensor to withstand greater mechanical acceleration forces.
Implementation Method 1
The two springs are disposed with an offset from one another with reference to their longitudinal axis... they no longer act as mutually delimiting elements and can thus be elongated at least in one direction without butting against one another or touching each other
Data Source
AI summary
An inertial sensor, comprising a substrate and a rocker that is connected to the substrate via a spring apparatus, the spring apparatus having at least two springs for suspending the rocker on the substrate, the two springs being disposed with an offset from one another with reference to their longitudinal axis.