Piston Cylinder Assembly Integrated Measuring Device
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Solution Overview
Problem
Conventional piston-cylinder assemblies face challenges in position detection of the piston and piston rod due to limited installation space, especially in compact systems where external measuring devices cannot be effectively used, leading to inaccurate and disturbance-prone position monitoring.
Innovation Solution
Integrating a measuring device, such as a PLCD sensor, within the cylinder housing close to the piston and piston rod, allowing for reduced installation space and improved accuracy by minimizing external interference, with the sensor arranged parallel to the piston's longitudinal axis and potentially within recesses or on the cylinder cover, and using a ring magnet for rotational compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external measuring devices are used for position detection, then position detection capability is provided, but installation space requirements increase
Solution Approach 1:
The measuring device is integrated into the cylinder housing, merging the measurement function with the existing structural component. This eliminates the need for separate external measuring devices and reduces the overall installation space while maintaining position detection capability.
Solution Approach 2:
The measuring device is nested within the cylinder housing structure, utilizing the existing space efficiently. The sensor is positioned inside the housing rather than externally, allowing position detection without increasing the external dimensions of the assembly.
2Measurement precision
If measuring devices are arranged externally on the piston-cylinder assembly, then position detection is possible, but measurement accuracy decreases due to disturbances
Solution Approach 1:
The measuring device is extracted from the external environment and placed inside the protected cylinder housing. This removes the sensor from exposure to external disturbances such as electromagnetic interference, mechanical vibrations, and environmental contaminants, thereby improving measurement accuracy.
Solution Approach 2:
The cylinder housing serves as a protective barrier that preemptively shields the measuring device from potential disturbances before they can affect the measurement. By positioning the sensor inside the housing, the design prevents external harmful factors from reaching the sensitive measurement components.
3Ease of operation
If the measuring device is positioned far from the piston, then installation flexibility is improved, but measurement accuracy and susceptibility to disturbances increase
Solution Approach 1:
Instead of positioning the measuring device along the stroke direction (one dimension), the sensor is arranged parallel to the longitudinal axis within the housing (utilizing a different spatial dimension). This allows the sensor to be close to the piston for accurate measurement while maintaining installation flexibility through the available internal housing space.
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 enables precise and disturbance-resistant position detection with minimal installation space, allowing for accurate monitoring of piston and piston rod movement even in compact systems and those with trailer pistons, while maintaining compact dimensions.
Implementation Method 1
the measuring apparatus has a PLCD sensor... The movable object, the position of which is to be determined, has a permanent magnet that generates a local magnetic saturation when it approaches the sensor
Implementation Method 2
The application of an alternating current to the coil that surrounds the core leads to an induction of different voltages in secondary coils
Data Source
AI summary
A piston-cylinder assembly, in particular for pneumatic, hydraulic or mechatronic systems, includes a cylinder housing and a piston. The piston is coupled to a piston rod and disposed in the cylinder housing such that it can move along a longitudinal axis. A measuring device for detecting piston or piston rod position is provided inside the cylinder housing.