Directional Control Valve Damping for Swing Motor Vibration
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Solution Overview
Problem
Hydraulic valve systems in vibration-prone applications, such as mobile machines, face challenges with damping vibrations effectively, leading to torsional vibrations and instability, especially when using load-sensing valves or load feedback solutions, which either result in high pressure losses or inaccurate speed control.
Innovation Solution
A valve design that utilizes the supply pressure from a swivel angle pump to create a bypass connection, allowing the pressure to rise quickly and counteract overshooting, without affecting the pressure compensator, and uses dual orifice devices to manage volume flow for precise speed control and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If lowering brake valves are installed in the return line to dampen vibrations, then vibration damping is improved, but pressure losses increase and system costs increase
Solution Approach 1:
The invention extracts the damping function from separate external valves (lowering brake valves) and integrates it directly into the return orifice structure of the main valve. The return orifice is designed with a specific geometry that provides damping through its inherent flow characteristics without requiring additional valve components, thereby eliminating the associated pressure losses and costs.
Solution Approach 2:
The invention merges the damping function with the return orifice structure. The return orifice serves dual purposes: controlling the return flow and providing vibration damping through its specific geometric design. This combination eliminates the need for separate damping valves and reduces overall system complexity and pressure losses.
2Stability of the object's composition
If load feedback with pressure divider circuit is used to achieve damping, then vibration damping is improved, but volume flow is withdrawn from the load resulting in inaccurate speed control
Solution Approach 1:
The invention extracts the damping function from the load feedback path and implements it directly in the return line through the specially designed return orifice. This extraction ensures that the damping action does not interfere with the load feedback signal or the volume flow available to the load, thereby maintaining accurate speed control while achieving vibration damping.
Solution Approach 2:
The return orifice acts as an intermediary element that provides damping without requiring the complex pressure divider circuit of traditional load feedback systems. By placing the damping function in the return line with a carefully designed orifice geometry, the system achieves damping while preserving the integrity of the load feedback path and speed control accuracy.
3Stability of the object's composition
If additional valves are installed for damping, then vibration damping is improved, but device complexity increases
Solution Approach 1:
The invention merges the damping function with the existing return orifice structure of the main valve. The return orifice is designed with specific geometric characteristics that provide damping without requiring additional valve components. This integration reduces device complexity while maintaining effective vibration damping.
Solution Approach 2:
The return orifice is designed to serve multiple functions: controlling the return flow, providing vibration damping, and maintaining system pressure balance. This multi-functionality eliminates the need for separate damping valves and reduces overall system complexity while achieving the desired damping effect.
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 effectively dampens vibrations without withdrawing volume flow from the load, enabling precise speed control and reducing costs by avoiding additional valves and pressure losses, while maintaining accurate speed adjustment even with position sensors.
Implementation Method 1
the supply pressure present at the pressure supply connection for controlling a consumer connected to the respective useful port is routed via a first orifice device and a control channel to a control side of the control slide
Implementation Method 2
which via a further orifice device is connected to the return port of the valve
Implementation Method 3
allowing the pressure to rise quickly and counteract overshooting
Implementation Method 4
uses dual orifice devices to manage volume flow for precise speed control and damping
Data Source
Figure 1~6
Figure 2
Figure 3~4
AI summary
1. Valve and valve device comprising a valve of that type. 2. The invention relates to a valve comprising a valve housing (33), which has at least one service connection (A, B), a pressure supply connection (P) and a return connection (T) and in which valve housing (33) a control slide (STS) is guided so as to be movable longitudinally in order to control these individual connections. The valve is characterised in that the supply pressure, which is applied to the pressure connection (P) in order to control a consumer (10, 12) connected to the service connection (A; B), is guided across at least one control side (56) of the control slide (STS) via an orifice plate (54) and a control channel (50), the control side (56) being positioned in a control chamber (58) in the valve housing (33) such that it can move and the control chamber (58) being connected to the return connection (T) via an additional orifice plate (59).