Vibration Isolator for Physical Quantity Sensor
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Solution Overview
Problem
Existing physical quantity sensors face challenges in reducing relative vibration between the sensor portion and the casing, leading to increased noise in output due to vibration transmission, and existing vibration isolation structures struggle to achieve a high strength with adjustable spring constants.
Innovation Solution
A physical quantity sensor design incorporating a vibration isolator between the sensor portion and the casing, where the isolator is strategically placed to absorb vibrations, and its spring constant is adjustable by varying its thickness and width, ensuring effective vibration reduction without compromising structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin spring is used as a vibration isolation structure, then the sensor portion is supported to reduce relative vibration, but it is difficult to accurately adjust the spring constant to a desired value and ensure structural strength
Solution Approach 1:
The patent applies parameter changes by modifying the thickness and width of the vibration isolator to adjust the spring constant to desired values. The vibration isolator's spring constant can be easily adjusted by varying its thickness and width, resolving the contradiction between achieving effective vibration isolation and enabling easy adjustment of mechanical properties.
Solution Approach 2:
The patent uses a vibration isolator made of a material that combines vibration damping properties with structural strength. This composite approach allows the isolator to effectively reduce vibrations while maintaining the necessary structural integrity, overcoming the limitations of simple resin springs.
2Volume of moving object
If the sensor portion is made small, then the device size is reduced, but the vibration isolator becomes more difficult to design with appropriate spring constant
Solution Approach 1:
The patent resolves the design complexity issue by using parameter changes in the vibration isolator's dimensions (thickness and width) to achieve the desired spring constant for small sensor portions. This simplifies the design process compared to traditional resin springs, allowing easy adjustment of mechanical properties even in compact configurations.
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 effectively reduces relative vibration between the sensor and casing, minimizing noise in output while allowing for easy adjustment of the spring constant to desired values, thereby enhancing the sensor's accuracy and reliability.
Implementation Method 1
The vibration isolator reduces a relative vibration between the sensor portion and the casing
Implementation Method 2
a vibration isolator located between the end surface and the supporting surface to join the sensor portion to the casing. The vibration isolator reduces a relative vibration between the sensor portion and the casing
Data Source
AI summary
A physical quantity sensor includes a sensor portion, a casing, and a vibration isolator. The casing includes a supporting portion with a supporting surface that is located to face an end surface of the sensor portion. The vibration isolator is located between the end surface of the sensor portion and the supporting surface of the casing to join the sensor portion to the casing. The vibration isolator reduces a relative vibration between the sensor portion and the casing.