Hydraulic Valve Arrangement with Self-Regulating Backflow
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Solution Overview
Problem
Existing hydraulic valve arrangements in cartridge construction lack the ability to control and regulate hydraulic consumers in mobile machines, as they rely on external electronic control units for algorithms and do not integrate functions necessary for mobile applications, such as direct adjustment by consumer inflow pressure.
Innovation Solution
A hydraulic valve arrangement with a summation interconnection of at least two hydraulic valves and a consumer interconnection, including a backflow valve that opens or closes based on consumer inflow pressure, utilizing a main piston and control piston interacting via a compression spring, and optionally includes summation and inflow valves for volume flow control and pressure limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing cartridge valves are used in mobile machines with external electronic control units, then control functions can be realized, but the device complexity increases and direct adjustment by consumer inflow pressure is lost
Solution Approach 1:
The backflow valve is directly adjusted by the consumer inflow pressure acting on the control piston, enabling the valve to regulate itself without external electronic control. The compression spring provides the counteracting force, creating a self-contained pressure-regulating mechanism that eliminates the need for complex electronic控制系统.
Solution Approach 2:
The invention extracts and eliminates the external electronic control unit from the system, replacing it with a purely hydraulic control mechanism. The consumer inflow pressure directly acts on the control piston to open or close the backflow valve, removing the intermediary electronic control layer and simplifying the overall device.
2Adaptability or versatility
If multiple hydraulic valves are integrated in a valve arrangement, then functions for mobile machines are achieved, but the device complexity increases
Solution Approach 1:
The invention merges multiple hydraulic functions (summation valve, inflow valve, backflow valve with pressure limitation) into a single integrated valve arrangement. The summation interconnection and consumer interconnection are combined in one compact structure, providing multiple functions while reducing the number of separate components and connections needed.
Solution Approach 2:
The valve arrangement is designed as a universal solution for mobile machine hydraulic systems, where a single integrated unit performs multiple functions: volume flow summation, directional control, backflow regulation, and pressure limitation. This multi-functional design eliminates the need for separate specialized valves for each function.
3Ease of operation
If backflow valve is directly adjusted by consumer inflow pressure, then ease of operation is improved, but the precision of pressure control may be affected
Solution Approach 1:
The consumer inflow pressure is fed back to the control piston, which directly influences the backflow valve opening. This creates a closed-loop feedback mechanism where the actual pressure conditions automatically regulate the valve position, ensuring accurate pressure control without external intervention.
Solution Approach 2:
The compression spring constant and the control piston surface area are designed to provide the appropriate sensitivity and range for pressure regulation. By carefully selecting these parameters, the system achieves both ease of automatic operation and precise pressure control within the required operating range.
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
Enables independent control of hydraulic consumer return volume flow and pressure, allowing for demand-based release of volume flows and protection against overload, ensuring proper operation in mobile machines by integrating functions like pressure limitation and check valve operations within the hydraulic control system.
Implementation Method 1
the main piston and a control piston interact with each other via a compression spring
Data Source
AI summary
The present invention relates to a hydraulic valve arrangement for controlling/regulating at least one hydraulic consumer of a mobile machine, with a summation interconnection of at least two hydraulic valves and at least one consumer interconnection of hydraulic valves, wherein the outputs of the summation interconnection are hydraulically connected with the inputs of the consumer interconnection, wherein at least one backflow valve is provided in the consumer interconnection. According to the invention, the at least one backflow valve for throttling a consumer return volume flow opens or closes in dependence on a consumer inflow pressure and comprises at least one main piston arranged in a bushing and at least two further pistons arranged in a lid separate from the bushing, wherein the main piston and the control piston interact with each other via a compression spring.