Hydraulic Cylinder Piston Magnet Assembly for Uniform Circumferential Field
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Solution Overview
Problem
Existing fluid pressure cylinders face challenges in producing a magnetic field around the entire circumference without using a ring-shaped magnet, and the size of magnets needs to be adjusted based on cylinder diameter, while point-wise magnet arrangements fail to generate a comprehensive magnetic field.
Innovation Solution
A piston unit with a holding member and ring-shaped yokes disposed on either side of multiple magnets at intervals in the circumferential direction, eliminating the need for a ring-shaped magnet and allowing for uniform magnetic field production across the circumference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a ring-shaped magnet is used to produce a magnetic field around the entire circumference, then the magnetic field coverage is improved, but the magnet size must be changed depending on the cylinder diameter, increasing device complexity
Solution Approach 1:
The ring-shaped magnet is segmented into multiple discrete magnets arranged circumferentially. Each magnet is a separate component that can be independently positioned, eliminating the need to change the entire magnet assembly when cylinder diameter changes. The segmented magnets work together to produce the required magnetic field around the entire circumference.
Solution Approach 2:
The multiple discrete magnets are designed to be universal components that can be used across different cylinder diameters. By adjusting the number, position, and arrangement of these standardized magnets, the same magnet type can serve multiple cylinder sizes, eliminating the need for size-specific magnet designs.
2Device complexity
If magnets are disposed only at certain points in the circumferential direction, then the device complexity is reduced, but a magnetic field cannot be produced outside the piston around the entire circumference
Solution Approach 1:
Magnets are strategically positioned at specific locations around the piston circumference based on local field requirements. The holding member ensures magnets are placed at optimal positions to create uniform magnetic flux density distribution. This localized positioning approach achieves complete circumferential magnetic field coverage without requiring magnets everywhere, maintaining simplicity while ensuring adequate field coverage.
3Stability of the object's composition
If the number of magnets is increased to improve magnetic field uniformity, then the magnetic flux density uniformity is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
Instead of using a full ring-shaped magnet or excessive number of small magnets, the invention uses a partial arrangement of a moderate number of discrete magnets. The holding member positions these magnets to achieve sufficient magnetic field uniformity for detection purposes, avoiding the complexity of using too many magnets while ensuring adequate field coverage through strategic placement.
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
Enables the production of a magnetic field around the entire circumference without requiring size adjustments for different cylinder diameters, reduces axial thickness, and simplifies the structure by using common magnets, while ensuring uniform magnetic flux density.
Implementation Method 1
a magnetic field can be produced around the entire circumference of the piston unit without using a ring-shaped magnet
Data Source
AI summary
A piston unit is provided with a piston body; a packing mounted on an outer circumferential portion of the piston body; a holding member having a plurality of magnet holding portions that are arranged along a circumferential direction; a plurality of magnets which are held at intervals in the circumferential direction; a first annular yoke disposed on one side in an axial direction of the plurality of magnets; and a second annular yoke disposed on the other side in the axial direction of the plurality of magnets.