Force Sensor Contact Surface Roughness for Accurate Mz Detection
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Solution Overview
Problem
Traditional force sensor devices experience reduced accuracy in detecting moments around the Z-axis due to sliding on contact faces with low surface roughness, leading to underestimated readings.
Innovation Solution
The force sensor device incorporates contact faces with an arithmetic average surface roughness of 3.0 or higher to prevent sliding, ensuring accurate detection of moments around the Z-axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the surface roughness of the contact face is low, then the contact face provides smooth surface, but sliding occurs on the contact face by the application of force, causing reduced detection precision
Solution Approach 1:
The patent changes the surface roughness parameter of the contact face from low (smooth) to high (rough, Sa ≥ 3.0 μm). This parameter change transforms the friction characteristics of the contact face, preventing sliding under applied forces and ensuring accurate moment detection around the Z-axis.
2Reliability
If the surface roughness of the contact face is high, then sliding is prevented on the contact face, but the contact face may not provide optimal contact characteristics
Solution Approach 1:
The patent optimizes the surface roughness parameter to a specific range (Sa ≥ 3.0 μm) that balances two requirements: providing sufficient friction to prevent sliding under applied forces, while maintaining acceptable contact characteristics for force transmission. This optimized parameter resolves the contradiction between reliability and ease of operation.
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
Enhances the stability and precision of moment Mz detection by maintaining linearity within 1.0% FS, preventing underestimation of readings.
Implementation Method 1
The sensor element of the force sensor device detects elastic deformation of the strain generator occurring by the application of an external force
Implementation Method 2
When the surface roughness of the contact face is low, sliding may occur on the contact face by the application of a force in a direction along a moment Mz around a Z axis
Data Source
AI summary
A force sensor device 1, which is to be coupled to a first coupling counterpart 61 in a direction of a predetermined axis, includes: a sensor chip 110 that detects a moment around the predetermined axis; and a first coupling portion 40 including a first contact face 44, where the first contact face 44 is to face the first coupling counterpart 61 in the direction of the predetermined axis and is to contact the first coupling counterpart 61. An arithmetic average surface roughness Sa of the first contact face 44 is 3.0 or higher.