Tool-Free Piston Rod Assembly With Engaging Joint and Damper
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Solution Overview
Problem
The assembly of piston assemblies in fluid pressure devices is complex and requires specific tools, making it difficult to assemble efficiently.
Innovation Solution
A piston assembly design featuring a piston body with a piston-side engaging portion and a piston rod with a rod-side engaging portion that can be easily connected by inserting one into the other, allowing for relative axial displacement regulation, and incorporating a damper mechanism to alleviate impact at stroke ends, enabling assembly without specialized tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional caulking method is used to assemble piston rod and piston body, then connection strength is improved, but assembly complexity increases and requires specific tools
Solution Approach 1:
The engaging portion is divided into an engaging protrusion on the piston rod and an engaging groove on the piston body, allowing separate fabrication of these components. This segmentation enables simpler assembly processes while maintaining connection strength, as each component can be optimized independently for its specific function.
Solution Approach 2:
The engaging protrusion and groove act as intermediary elements between the piston rod and piston body, providing a simplified connection interface. This intermediary structure replaces the complex caulking process with a straightforward insertion and engagement mechanism, reducing assembly complexity while ensuring reliable connection.
2Strength
If traditional caulking method is used to assemble piston rod and piston body, then connection strength is improved, but ease of manufacture deteriorates
Solution Approach 1:
By segmenting the connection interface into a protrusion and groove, each component can be manufactured using simpler processes. The piston rod receives the protrusion and the piston body receives the groove, both of which can be formed through standard machining or molding operations, significantly improving ease of manufacture compared to traditional caulking.
Solution Approach 2:
The engagement geometry parameters (protrusion shape, groove dimensions, engagement depth) can be optimized independently to achieve the required connection strength. This parametric design approach allows for easier manufacturing by selecting parameters that are compatible with standard manufacturing processes while maintaining the necessary mechanical strength.
3Ease of manufacture
If engaging protrusion and groove structure is used, then assembly process is simplified, but manufacturing precision requirements increase
Solution Approach 1:
The engaging protrusion and groove are designed with asymmetric geometries that provide inherent alignment features. The protrusion fits into the groove in a specific orientation, which guides the assembly process and reduces the precision requirements for perpendicularity and parallelism, thereby simplifying assembly while maintaining controlled manufacturing tolerances.
Solution Approach 2:
The engaging protrusion is designed to nest within the engaging groove, creating a self-aligning connection. This nesting arrangement provides natural positioning and tolerance compensation, reducing the overall precision requirements for the engagement interface while ensuring reliable connection and simplified assembly procedures.
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 of piston assemblies, allowing for easy connection of the piston body and piston rod by hand and reduces impact at stroke ends, enhancing assembly efficiency and durability.
Implementation Method 1
a damper mechanism configured to relieve impact occurring when the piston body reaches at least one of stroke ends
Data Source
AI summary
A rod assembly for a fluid pressure cylinder includes a rod member and a packing that is mounted on an outer circumferential part of the rod member and slides along a slide hole. Assembly is simple because a conventional hard piston is not used. The assembly can be carried out simply by hand without the use of a dedicated tool. Thus, the rod assembly simplifies assembly work.