Hydraulic System Local Compensation Volume Elements
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Solution Overview
Problem
Conventional hydraulic systems require large central reservoirs to compensate for differential volumes and temperature-related fluctuations, leading to increased weight and size, especially in systems with redundant circuits, such as those in aircraft construction.
Innovation Solution
Incorporating local compensation volume elements for each operating cylinder, which adapt to and compensate for differential volumes, allowing the central reservoir to be minimized, and using shared compensation volume elements for pressure accumulators to reduce overall system size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large central reservoir is used to compensate for differential volumes in hydraulic systems, then the system can accommodate volume fluctuations and leakage, but the physical size and weight of the system increase significantly
Solution Approach 1:
The invention divides the compensation function into two parts: a small central reservoir for leakage and temperature compensation, and local compensation volume elements integrated with each operating cylinder for differential volume compensation. This segmentation allows each reservoir to be minimized for its specific purpose, eliminating the need for one large oversized reservoir.
Solution Approach 2:
The invention introduces local compensation volume elements directly associated with each operating cylinder, providing compensation exactly where the differential volume is generated. This local approach eliminates the need for a large centralized reservoir, as each cylinder's differential volume is compensated locally rather than requiring a central reservoir large enough to handle the sum of all differential volumes.
2Adaptability or versatility
If the central reservoir is dimensioned to accommodate the sum of all differential volumes from multiple operating cylinders, then all cylinders can be actuated independently, but the reservoir volume becomes excessively large
Solution Approach 1:
The invention segments the compensation function by providing local compensation volume elements for each operating cylinder, allowing each cylinder to be actuated independently with its own dedicated compensation volume, rather than requiring a single large central reservoir to accommodate the sum of all differential volumes.
Solution Approach 2:
The invention transitions from a centralized compensation approach (single large reservoir) to a distributed compensation approach (multiple small local reservoirs), effectively changing the spatial organization from one-dimensional centralization to multi-dimensional distribution across the hydraulic system.
3Reliability
If redundant hydraulic circuits are implemented for safety, then system reliability improves, but the total reservoir volume and fluid amount increase substantially
Solution Approach 1:
The invention applies segmentation to redundant circuits by providing local compensation volume elements for each operating cylinder in each redundant circuit, rather than requiring a single large central reservoir to accommodate all differential volumes from all redundant circuits. This allows each redundant circuit to have its own minimized local compensation volumes.
Solution Approach 2:
The invention merges the compensation function into the operating cylinders themselves through integrated local compensation volume elements, eliminating the need for separate large central reservoirs for each redundant circuit. This merging reduces the total volume and weight while maintaining the redundancy required for safety.
4Weight of stationary object
If the central reservoir volume is reduced to minimize weight and size, then the system becomes more compact, but it cannot accommodate the differential volumes from operating cylinders
Solution Approach 1:
The invention provides local compensation volume elements integrated with each operating cylinder to handle differential volume compensation locally, allowing the central reservoir to be minimized for weight and size while maintaining reliable differential volume compensation through the distributed local elements.
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 approach significantly reduces the physical size and weight of hydraulic systems by eliminating the need for large central reservoirs, allowing for more efficient use of space and materials, and enabling local enlargement of operating cylinders without altering existing central reservoirs.
Implementation Method 1
the compensation volume element is adapted in such a way that it compensates for the differential volume between the high-pressure side and the low-pressure side of the operating cylinder
Implementation Method 2
one or several operating cylinders have a pressure accumulator whose useful piston displacement
Data Source
AI summary
A hydraulic system includes a reservoir for a hydraulic fluid, a pump, a high-pressure line network, a low-pressure line network and operating cylinders each of which can be connected to the high-pressure line network or to the low-pressure line network via control units, each operating cylinder is associated with a local compensation volume element.