Fluid Pressure Cylinder Cushion Mechanism Orifice Plug
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Solution Overview
Problem
Existing hydraulic cylinders require removal and reassembly of the first covering member to adjust cushion performance, which is inconvenient and prone to instability due to machining accuracy and coaxiality issues.
Innovation Solution
A fluid pressure cylinder with a piston rod and annular holder, featuring a cushion mechanism with an orifice plug that can be replaced through a dedicated port, allowing for adjustable cushion performance without disassembling the cylinder head, using a cushion ring and passages to control fluid flow and decelerate the piston rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the first covering member is removed to adjust the reducing hole diameter, then cushion performance can be adjusted, but the operation becomes complex and stability decreases due to machining accuracy and coaxiality issues
Solution Approach 1:
The reducing hole is segmented into a fixed portion (reducing hole formation part) and a replaceable portion (orifice plug). This allows the cushion performance to be adjusted by simply replacing the orifice plug through the replacement port, without removing the first covering member or performing complex machining operations, thereby improving ease of operation while maintaining adaptability
Solution Approach 2:
The orifice plug is extracted as a separate, replaceable component from the reducing hole structure. It can be removed through the replacement port and replaced with different规格的 plugs to adjust cushion performance, eliminating the need to disassemble the first covering member and avoiding machining accuracy and coaxiality problems
2Adaptability or versatility
If the first covering member is removed to adjust the reducing hole, then cushion performance can be changed, but device complexity increases and reliability decreases
Solution Approach 1:
By segmenting the reducing hole into a fixed formation part and a replaceable orifice plug, the system maintains stable machining accuracy in the fixed part while allowing performance adjustment through the replaceable part. This segmentation prevents the reliability issues that arise from repeated machining and reassembly of the first covering member
Solution Approach 2:
The orifice plug is pre-manufactured with precise dimensions and can be replaced without requiring precision machining operations during field adjustments. This preliminary preparation of the adjustment component eliminates the reliability problems associated with on-site machining accuracy and coaxiality alignment
3Ease of operation
If the orifice plug is made replaceable through a replacement port, then ease of operation improves, but device complexity increases
Solution Approach 1:
The orifice plug is extracted as a standalone replaceable component accessible through the replacement port. While this adds a component, it simplifies the overall adjustment operation significantly and allows for standardization of the replacement mechanism, which can reduce long-term maintenance complexity
Solution Approach 2:
The replacement port and holder structure serve multiple functions: they provide access for orifice plug replacement, maintain sealing of the working chamber, and support the cushion mechanism structure. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
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 easy adjustment of cushion performance by replacing the orifice plug, stabilizing the cushion action and reducing variations, as it is less affected by fluid viscosity and machining accuracy, allowing for consistent operation without disassembling the cylinder head.
Implementation Method 1
an orifice plug fastened to the cushion passage and applying resistance to a flow of the working fluid
Implementation Method 2
the working fluid of the working chamber 9 is discharged toward the port 11 via the reducing hole 18 from the opening portion 17 while its flow rate is limited, and a cushion action is applied at the movement end of the piston rod 6
Data Source
AI summary
A cushion mechanism for decelerating a piston rod includes a holder fastened to an end surface of a cylinder portion fitted with an inner peripheral surface of a cylinder tube, an annular entry portion provided on the piston rod and advancing into the holder and the cylinder portion in the vicinity of the stroke end, a cushion passage leading a working fluid of the working chamber to a supply/discharge port, and an orifice plug fastened to the cushion passage, and the cushion passage includes an internal passage extending in a radial direction of the holder and to which the orifice plug is fastened, and the orifice plug is replaceable through a replacement port formed by penetrating the cylinder tube and communicating with the internal passage.