Two-Stage Pre-Throttle Vibration Damper for Faster Valve Switching
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Solution Overview
Problem
Conventional pilot-controlled pressure-limiting valves face a design dilemma where achieving a soft characteristic curve requires high hydraulic resistance, but good valve stability and rapid switching times necessitate lower hydraulic resistance, making it difficult to balance these conflicting goals.
Innovation Solution
A two-stage pre-throttle valve assembly with adjustable hydraulic resistance is used, allowing for reduced pilot volume flow at low pressures and increased flow at high pressures, with adjustable transition behavior through bias and rigidity of valve components, enabling controlled pilot volume flow and damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a pre-throttle valve with high hydraulic resistance is used, then the soft characteristic curve is improved, but the valve stability and switching time deteriorate
Solution Approach 1:
The pre-throttle valve is divided into two stages: a first pre-throttle valve with higher hydraulic resistance for soft characteristic control, and a second pre-throttle valve with lower hydraulic resistance for stability and switching time improvement. This segmentation allows each stage to optimize for its specific function rather than compromising a single valve design.
Solution Approach 2:
The system dynamically switches between different pre-throttle valve configurations based on operating conditions. The pilot-controlled pressure-limiting valve adjusts the effective hydraulic resistance by activating different pre-throttle stages, enabling the system to adapt between soft characteristic mode and rapid switching mode as needed.
2Stability of the object's composition
If a pre-throttle valve with high hydraulic resistance is used, then the soft characteristic curve is improved, but the pilot volume flow rate deteriorates
Solution Approach 1:
The pre-throttle function is segmented into two stages with different resistance characteristics. The first stage provides high resistance for soft characteristic control, while the second stage provides lower resistance pathways that become active when higher pilot volume flow rates are needed, decoupling these conflicting requirements.
Solution Approach 2:
The system changes the effective hydraulic resistance parameter of the pre-throttle assembly based on operating conditions. By adjusting which pre-throttle stage is active, the system can vary the hydraulic resistance to match the desired pilot volume flow rate and characteristic curve softness requirements for different operating modes.
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 allows for improved stability and reduced switching times while maintaining pressure-limiting valve performance, effectively addressing the conflict between soft characteristic curves and rapid switching requirements.
Implementation Method 1
a two-stage pre-throttle valve assembly placed in front of the pilot valve (40), by means of which the pilot volume flow rate can be reduced for low pilot pressures
Implementation Method 2
a damping valve element which is in the form of a pilot-controlled pressure-limiting valve having a pilot valve (36)
Data Source
AI summary
A controllable vibration damper with damping force control may include a damper tube housing that is filled with damping medium. The controllable vibration damper may also include a damping valve element that is structurally and fluidically connected to the damper tube housing for damping force control. The damping valve element may be configured as a pilot-controlled pressure-limiting valve having a pilot valve. Further, a two-stage pre-throttle valve assembly placed in front of the pilot valve. The damping valve element may be arranged internally with respect to the damper tube housing in some cases. In other cases, the tamping valve element may be arranged externally with respect to the damper tube housing.