Hydraulic Piston Insert Mounting With Pliable Rings for Low-Cost Efficiency
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Solution Overview
Problem
The inefficiency of hydraulic piston machines due to the compressibility of fluids, which increases energy loss and reduces operational efficiency, and the high costs associated with accurately manufacturing inserts to prevent piston deformation.
Innovation Solution
The use of at least two pliable rings between the insert and the wall of the piston to secure the insert's position, preventing deformation and wear, and allowing for fluid flow to cool the piston, while using lightweight, non-compressible materials like ceramic or fibre-reinforced polymers for the insert.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insert is pressed into the hollow to secure it in the piston, then the insert position is fixed, but the piston may deform and manufacturing costs increase due to high accuracy requirements
Solution Approach 1:
The patent uses pliable rings (flexible elements) arranged between the insert and the hollow wall to secure the insert position. These rings deform during insertion and then elastically retain the insert, avoiding the need for high-precision pressing operations and reducing manufacturing costs while maintaining reliability
Solution Approach 2:
The pliable rings act as intermediary elements between the insert and the hollow wall, providing a compliant mounting interface that absorbs dimensional variations and reduces the need for tight tolerances in both the insert and hollow manufacturing
2Reliability
If the insert is securely fixed in the hollow, then the insert position is maintained under centrifugal forces, but the structure becomes more complex
Solution Approach 1:
The pliable rings provide a simple yet effective solution for securing the insert under centrifugal forces. The elastic nature of the rings allows them to maintain contact and positioning without adding complex rigid fastening mechanisms, thus maintaining structural simplicity while ensuring reliability
3Manufacturing precision
If the insert is pressed into the hollow with high accuracy, then piston deformation is prevented, but manufacturing costs increase
Solution Approach 1:
The pliable rings accommodate dimensional variations in the insert and hollow through elastic deformation, allowing for less precise manufacturing of individual components. This reduces the overall manufacturing cost while preventing piston deformation through the compliant mounting interface
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 solution enhances the operational efficiency and reduces costs by maintaining the insert's position against centrifugal forces, minimizing wear, and enabling the use of lightweight, high-stiffness materials for the insert, while allowing for efficient fluid flow and cooling.
Implementation Method 1
The pliable rings can be deformed during the insertion of the insert into the hollow. After insertion of the insert into the hollow the pliable rings secure the insert in the piston thereby defining a position of the insert in the hollow which can be maintained even against forces which can be produced by centrifugal forces
Implementation Method 2
the gap allows a flow of fluid along the wall of the piston which can be used for cooling the piston
Data Source
AI summary
A piston (1) of a hydraulic piston machine is described, the piston (1) having a hollow (2) surrounded by a wall (3) and an insert (4) arranged in the hollow (2). Such a piston is used to have a piston machine with high efficiency at low costs. To this end at least two pliable rings (12, 13) are arranged between the insert (4) and the wall (3).