Magnetic Piston Structure for Shorter Fluid Pressure Cylinders
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Solution Overview
Problem
Fluid pressure cylinders with magnets attached to pistons typically have larger axial dimensions, leading to increased overall length, which is undesirable.
Innovation Solution
The design incorporates a wear ring attached to the outer circumferential part of a ring-shaped magnet, allowing the magnet and wear ring to share the same axial position, reducing the axial dimension of the piston body by integrating the wear ring with the magnet and optimizing its placement to minimize the required magnetic force and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a magnet is attached to the piston to enable position detection, then the piston can be equipped with magnetic sensing capability, but the axial dimension of the piston increases
Solution Approach 1:
The wear ring and magnet are merged into a single integrated component, where the magnet is attached to the outer circumferential part of the wear ring. This combination allows both the wear protection function and magnetic sensing function to be achieved within the same axial space, eliminating the need for separate axial positioning of these components.
Solution Approach 2:
The magnet is positioned radially outward on the wear ring rather than extending axially from the piston body. By utilizing the radial dimension for magnet placement, the axial dimension is preserved while still enabling magnetic field detection for position sensing.
2Ease of manufacture
If the wear ring and magnet are disposed at different axial positions, then each component can be independently positioned, but the axial dimension of the piston body increases
Solution Approach 1:
The wear ring and magnet are merged into a single integrated component, where the magnet is attached to the outer circumferential part of the wear ring. This combination allows both the wear protection function and magnetic sensing function to be achieved within the same axial space, eliminating the need for separate axial positioning of these components.
3Difficulty of detecting and measuring
If the magnet is made larger and thicker to provide sufficient magnetic force, then the magnetic sensing capability is improved, but the axial dimension of the piston body increases
Solution Approach 1:
The magnet is positioned radially outward on the wear ring rather than extending axially from the piston body. By utilizing the radial dimension for magnet placement, the axial dimension is preserved while still enabling magnetic field detection for position sensing.
Solution Approach 2:
The wear ring serves as an intermediary structure that positions the magnet radially outward toward the magnetic sensor. This intermediary placement optimizes the magnetic field interaction without requiring increased axial dimension, as the wear ring mediates between the piston body and the external sensor.
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 reduces the axial dimension of the piston body and the overall fluid pressure cylinder length, while maintaining mechanical strength and allowing for efficient magnetic sensing.
Implementation Method 1
a ring-shaped magnet attached to the outer circumferential part of the piston body
Data Source
AI summary
A fluid pressure cylinder is provided with a cylinder tube having a sliding hole internally; a piston unit disposed along the sliding hole so as to be capable of moving back and forth, and a piston rod projected in the axial direction from the piston unit. The piston unit can shorten the axial dimension of a piston body by mounting a wear ring to an outer circumferential section of a ring-shaped magnet attached to an outer circumferential section of the piston body.