Fluid Pressure Cylinder Sensor Mounting Length Reduction
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Solution Overview
Problem
Conventional fluid pressure cylinders with built-in magnetostrictive displacement sensors suffer from increased mounting length due to the sensor body's external placement, compromising mountability and requiring complex disassembly for sensor inspection and exchange.
Innovation Solution
The sensor body is integrated within the cylinder tube's through hole, fixed by a plug and female screw, allowing for reduced mounting length and easy sensor access, while maintaining structural integrity and preventing fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor body is disposed on the outer side of the base portion of the cylinder tube, then the displacement sensor can be properly installed and function, but the mounting length of the fluid pressure cylinder is increased, deteriorating mountability to the equipment
Solution Approach 1:
The sensor body is nested within the hollow part of the bracket that contains the lower clevis. Specifically, the sensor body is disposed inside the hollow portion of the bracket, utilizing the existing internal space rather than adding external volume. This nesting approach allows the displacement sensor to be properly installed and function while avoiding increase in the mounting length of the fluid pressure cylinder, thereby resolving the contradiction between sensor installation reliability and mountability.
2Reliability
If the sensor body is disposed on the outer side of the base portion, then the displacement sensor can be installed, but complex disassembly is required for sensor inspection and exchange
Solution Approach 1:
The bracket is designed with a removable cover that segments the hollow portion, allowing access to the sensor body. The cover can be detached to enable inspection and exchange of the displacement sensor without requiring complex disassembly of the entire cylinder assembly. This segmentation approach maintains secure installation of the sensor while significantly improving ease of repair and maintenance.
3Length of moving object
If the sensor body is integrated within the cylinder tube's through hole, then mounting length is reduced and mountability is enhanced, but structural integrity and fluid leakage prevention must be maintained
Solution Approach 1:
The sealing function is merged with the mounting structure by providing a sealing ring that is integrated into the plug assembly. The plug is screwed into the through hole to secure the sensor body, while the sealing ring simultaneously prevents fluid leakage through the through hole. This merging of mounting and sealing functions reduces mounting length while maintaining structural integrity and fluid leakage prevention.
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 configuration enhances mountability, simplifies sensor maintenance, and improves the fluid pressure cylinder's tensile strength and rigidity by securely fixing the sensor without increasing central stress, while preventing fluid leakage.
Implementation Method 1
JP2007-71363A discloses a fluid pressure cylinder having a built-in magnetostrictive displacement sensor that detects relative displacement between a piston rod and a cylinder tube
Data Source
AI summary
A fluid pressure cylinder includes a cylinder tube, a piston rod, and a displacement sensor. A bottom portion of the cylinder tube has: a pin hole formed in a direction orthogonal to a center axis; and a through hole penetrating the bottom portion through the pin hole. The displacement sensor has: a sensor body disposed on inner side of the pin hole in the through hole; a sensor rod provided so as to extend from the sensor body; and an annular magnet relatively movable with respect to the sensor rod. The through hole has: a reduced-diameter portion; and a female screw portion that has a female screw formed on an inner circumference of the female screw portion. The sensor body is fixed by being pressed by a plug that is screwed into the female screw portion and by being engaged with the reduced-diameter portion.