Switchable Hydrostatic Adjusting Device for Load-Rigid Flexible Modes
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Solution Overview
Problem
Existing hydrostatic adjusting devices for hydraulic machines face challenges in seamlessly switching between load-rigid and load-flexible operations, often requiring complex electronics and sensor systems, which are costly and less reliable, and struggle to maintain load independence under varying external loads.
Innovation Solution
The solution involves a hydrostatic adjusting device that can dynamically open and close control lines to adjust servo pressure feedback, allowing for seamless switching between load-rigid and load-flexible modes using a minimal component setup, including a load response valve that can be actuated by a proportional magnet, enabling infinitely variable load sensitivity without the need for extensive sensor systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic sensors and control systems are used to switch between load-rigid and load-flexible modes, then switching precision and responsiveness are improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces electronic sensors and control systems with a purely mechanical solution. A spring-loaded piston with a controllable opening connects the servo pressure chamber to the control cylinder, allowing mechanical sensing and response to load changes. This mechanical substitution eliminates complex electronics while maintaining switching precision through the physical interaction of spring force, piston displacement, and pressure equilibrium.
Solution Approach 2:
The system uses self-service through automatic load-sensing mechanisms. The spring-loaded piston automatically detects servo pressure changes caused by external loads and triggers mode switching without external control signals. The mechanical system serves itself by using the process variables (pressure, force) directly to control the switching action, eliminating the need for separate sensing and control systems.
2Ease of operation
If complex sensor systems are implemented for mode switching, then operational control is improved, but reliability decreases due to more failure points
Solution Approach 1:
The patent replaces electronic sensors and control systems with a purely mechanical solution. A spring-loaded piston with a controllable opening connects the servo pressure chamber to the control cylinder, allowing mechanical sensing and response to load changes. This mechanical substitution eliminates complex electronics while maintaining switching precision through the physical interaction of spring force, piston displacement, and pressure equilibrium.
Solution Approach 2:
The system uses self-service through automatic load-sensing mechanisms. The spring-loaded piston automatically detects servo pressure changes caused by external loads and triggers mode switching without external control signals. The mechanical system serves itself by using the process variables (pressure, force) directly to control the switching action, eliminating the need for separate sensing and control systems.
3Adaptability or versatility
If servo pressure is continuously fed back to the control piston, then load-flexibility is improved, but load-independence deteriorates
Solution Approach 1:
The patent implements dynamic control of pressure feedback through a spring-loaded piston with a controllable opening. The system can switch between two states: closed (load-rigid) where no servo pressure feedback reaches the control piston, and open (load-flexible) where servo pressure is fed back through the opening. This dynamic switching capability allows the system to adapt its feedback characteristics based on operational requirements, achieving both load-rigidity and load-flexibility as needed.
Solution Approach 2:
The system changes the parameter of pressure feedback by using a spring-loaded piston to control the opening state. When the spring is compressed (load-rigid mode), the opening is closed and pressure feedback is blocked. When the spring expands (load-flexible mode), the opening opens and pressure feedback is enabled. This parameter change (open/closed state) allows the system to transition between load-independent and load-adaptive behavior.
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 configuration allows for precise and rapid switching between load-rigid and load-flexible operations, maintaining load independence and reducing costs by minimizing the use of sensors and electronics, while accommodating various hydraulic machine configurations and operational demands.
Implementation Method 1
The load response valve can be actuated by a proportional magnet
Implementation Method 2
a control line which returns the pressure in the servo cylinder to an end side of the control piston
Data Source
AI summary
Hydrostatic adjusting device of a hydraulic machine, the swept volume of which can be adjusted by way of a servo adjusting unit, having a control unit which has a control cylinder which has at least one inlet for pressurized hydraulic fluid, at least one servo connector for a connecting line to the servo adjusting unit, and at least one outlet to a hydraulic fluid collecting region. A control piston is arranged in the control cylinder, which control piston can be displaced by means of at least one control piston actuator and has control edges. In interaction with control edges which are configured in the control cylinder, the inlet or the outlet can be alternately connected hydraulically to the connecting line, whereby the pressure which prevails in the connecting line can be returned hydraulically via a control line to at least one end side of the control piston.