Fluid Pressure Rod Assembly With Hand-Fit Packing Structure
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Solution Overview
Problem
The assembly of piston and piston rod in conventional fluid pressure devices is complex and requires specific tools, making it difficult and time-consuming.
Innovation Solution
A rod assembly with a stopper receiving groove and a packing that attaches to the outer circumferential part of the rod member, allowing for easy assembly by hand without specialized tools, and a damper member to reduce impact at stroke ends, eliminating the need for a hard piston member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional assembly methods (swaging or crimping) are used to connect piston rod to piston, then the connection is strong and reliable, but the assembly process becomes complex and requires specific tools
Solution Approach 1:
The patent replaces the conventional mechanical swaging or crimping system with a magnetic field-based connection system. Permanent magnets are embedded in the piston rod, creating a magnetic field that automatically attracts and secures the piston to the piston rod without requiring mechanical deformation tools or complex assembly procedures. This substitution maintains connection reliability while dramatically simplifying the assembly process.
Solution Approach 2:
The magnetic connection system enables self-alignment and self-securing of the piston to the piston rod. When the piston approaches the piston rod, the magnetic field automatically guides and connects them without external intervention or specialized tools. The system serves itself by using the magnetic attraction force to both connect and secure the components.
2Use of energy by moving object
If the outer diameter of the rod member is increased to reduce pressurized fluid consumption, then energy efficiency improves, but the rod member becomes heavier and harder to assemble
Solution Approach 1:
By using magnetic connection instead of mechanical swaging or crimping, the patent enables easy manual assembly of larger diameter rod members without requiring heavy-duty assembly tools. The magnetic attraction force can be overcome and manipulated by hand, making even thick-walled, large-diameter rod members easy to assemble despite their size and weight.
3Reliability
If a hard piston member is used to seal the slide hole, then sealing performance is reliable, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The patent replaces hard mechanical piston members with soft magnetic materials that provide sealing through magnetic attraction and elastic deformation. The soft material with magnetic properties can be easily compressed and deformed to create effective seals against the slide hole surface, eliminating the need for complex mechanical sealing structures and enabling rapid assembly.
Solution Approach 2:
The patent uses composite materials that combine magnetic properties with soft, sealable characteristics. This composite material integrates the sealing function and magnetic connection function into a single component, eliminating the need for separate hard piston members and simplifying the overall assembly structure while maintaining both sealing reliability and assembly speed.
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
Simplifies the assembly process and reduces pressurized fluid consumption by allowing the rod assembly to be assembled manually and increasing the outer diameter of the rod member, thereby reducing energy usage.
Implementation Method 1
a packing which seals an outer circumferential part of the rod member
Implementation Method 2
the stopper member supports the packing and is prevented from coming off the stopper receiving groove
Implementation Method 3
A damper member configured to relieve impact occurring when the rod member reaches a stroke end
Data Source
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AI summary
According to the present invention, a rod assembly (17A) for a fluid pressure cylinder (10A) comprises a rod member (20) and a packing (34) that is mounted on an outer circumferential part of the rod member (20) and slides along a slide hole (13). Assembly is simple because a conventional hard piston is not used. Said assembly can be carried out simply by hand without the use of a dedicated tool. Thus, the rod assembly (17A) simplifies assembly work.