Hydraulic Piston Damping Chamber for Sudden Counter-Pressure Loss
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Solution Overview
Problem
Hydraulically operated pistons in cylinders experience excessive wear and reaction forces due to sudden acceleration during brittle fracture of materials like steel wires, leading to significant G-forces and reduced service life in cutting or punching operations.
Innovation Solution
A hydraulic chamber is designed with a throttling effect, where hydraulic fluid is displaced from the chamber via a limiting device, creating a closed system that dampens piston movement when counter-pressure is lost, reducing excessive acceleration and wear by maintaining hydraulic pressure and cushioning sudden movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston operates in a conventional hydraulic system without a damping chamber, then the cutting or punching force can be applied effectively, but the piston experiences excessive acceleration and reaction forces when counter-pressure is suddenly lost, leading to severe wear and reduced service life
Solution Approach 1:
The patent applies beforehand cushioning by providing a damping chamber (20) filled with hydraulic fluid that acts as a pre-prepared cushioning system. When the piston (10) experiences sudden acceleration due to loss of counter-pressure, the hydraulic fluid in the damping chamber provides immediate resistance through the throttling opening (23), cushioning the piston's movement before excessive forces can develop. This prevents the harmful effects of sudden pressure loss without requiring active control systems.
2Productivity
If the piston moves quickly to maintain productivity, then cutting or punching operations can be performed efficiently, but the sudden loss of counter-pressure causes uncontrolled acceleration and excessive G-forces
Solution Approach 1:
The patent introduces an intermediary element - the damping chamber (20) with throttling opening (23) - that mediates between the piston's rapid movement and the hydraulic system. The throttling opening acts as a flow restrictor that allows controlled movement while resisting sudden acceleration. When the piston moves at normal speed during cutting operations, the system maintains productivity. When sudden pressure loss occurs, the throttling opening limits the rate of fluid flow, thereby limiting piston acceleration and preventing excessive G-forces.
3Reliability
If a throttling device is added to dampen piston movement, then wear and reaction forces are reduced, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating the damping chamber (20) into the existing hydraulic cylinder structure. The damping chamber is formed as part of the cylinder wall, and the throttling opening (23) is incorporated into the piston or cylinder bore. This merging approach allows the damping function to be added without requiring a completely separate damping system, thereby reducing the increase in device complexity while still achieving the goal of reducing wear and reaction forces.
4Force
If the hydraulic chamber volume is reduced to create damping effect, then piston acceleration is controlled, but the working volume available for hydraulic fluid is reduced
Solution Approach 1:
The patent applies local quality by creating a localized damping chamber (20) with specific volume and throttling characteristics in a particular region of the hydraulic system, while the rest of the hydraulic system maintains its normal operating volume. The damping chamber is positioned to provide cushioning during reverse piston movement, and its volume is optimized to provide adequate damping force without significantly reducing the overall working volume of the hydraulic system. The throttling opening (23) is sized to provide the desired damping effect while allowing sufficient fluid flow during normal operation.
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
The hydraulic damping significantly reduces high pressure values and extends the service life of hydraulic working tools by minimizing wear and tear, ensuring the piston is braked and cushioned during sudden counterforce losses, thereby preventing excessive wear and maintaining tool functionality.
Implementation Method 1
there is hydraulic damping of the piston in the loading direction
Implementation Method 2
the limiting device also being designed with such a throttling effect
Implementation Method 3
hydraulic fluid, in particular a hydraulic oil, is practically incompressible at normal pressures of up to about 100 or 200 bar, compression occurs at higher pressures, which leads to a corresponding force being stored in the hydraulic medium
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
The invention relates to a hydraulically actuated piston (9) guided in a cylinder (8), and to a hydraulic working tool (1) having a working head (2), wherein the piston (9) has an impact surface (15) which borders an impact space (16) on the piston side provided between the piston (9) and the cylinder (8), and wherein hydraulic fluid (17) can act on the impact surface (15) by increasing the impact space (16) in order to move the piston (9) in an impact direction (r), and the piston (9) forms a limiting device (25) for a through-flow of the hydraulic fluid (17). According to the invention, in order to design a hydraulic piston guided in a cylinder or a hydraulic working tool in such a way that no undue signs of wear occur even during working processes with the sudden disappearance of the counter pressure, a hydraulic chamber (19) filled with the hydraulic fluid (17) is formed in the impact direction (r) after the limiting device (25), wherein a volume of the hydraulic chamber (19) is reduced according to the increase in the impact space (16), by means of the displacement of hydraulic fluid (17) out of the hydraulic chamber (19) and into the impact space (16) via the limiting device (25).