Hydraulic Valve Backflow Piston Pressure Control
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Solution Overview
Problem
Existing hydraulic valve arrangements in cartridge construction lack the ability to control and regulate hydraulic consumer operations in mobile machines, requiring external electronic control units to manage valve functions, and do not inherently adjust backflow based on consumer inflow pressure.
Innovation Solution
A hydraulic valve arrangement with a summation interconnection of valves and a consumer interconnection that includes a backflow valve, which opens or closes to throttle return volume flow based on consumer inflow pressure, utilizing a main piston and additional pistons to manage pressure and flow directions, and can be controlled by external signals for additional functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing cartridge valves are used in mobile machines, then the valves can be integrated into hydraulic systems, but they require external electronic control units to perform control functions, increasing system complexity
Solution Approach 1:
The patent combines multiple valve functions (backflow valve, summation valve, inflow valve) into a single integrated cartridge valve assembly. The backflow valve with its main piston and additional pistons is merged with summation and inflow valve functions in one compact unit, eliminating the need for separate external control units and reducing overall system complexity while maintaining adaptability to mobile machine hydraulic systems
2Reliability
If backflow valve is adjusted directly by consumer inflow pressure, then the valve can autonomously maintain consumer inflow pressure, but the valve structure becomes more complex with multiple pistons
Solution Approach 1:
The backflow valve is designed to be self-adjusting through direct action of consumer inflow pressure on the main piston and additional pistons. The valve autonomously maintains consumer inflow pressure without external control signals by using the hydraulic pressure itself to actuate the piston mechanism, achieving reliable autonomous pressure maintenance while keeping the structure relatively simple through direct hydraulic actuation
Solution Approach 2:
The valve structure employs a nested arrangement where additional pistons are positioned within or around the main piston assembly. The first additional piston and second additional piston are integrated into the backflow valve structure with the main piston, creating a compact nested configuration that achieves complex pressure control functions without proportionally increasing overall valve complexity
3Measurement precision
If multiple pistons are used in backflow valve, then pressure control precision is improved, but manufacturing complexity increases
Solution Approach 1:
The backflow valve is segmented into distinct functional components: a main piston for primary pressure control and additional pistons (first additional piston, second additional piston) for refined pressure regulation. This segmentation allows each piston to perform specific pressure control functions, achieving high pressure control precision while enabling modular manufacturing and assembly of the valve components
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 operations within mobile machines, maintaining consumer inflow pressure and limiting pressure to prevent overload, thus enhancing the reliability and efficiency of hydraulic systems in mobile equipment.
Implementation Method 1
for throttling a consumer return volume flow the at least one backflow valve opens or closes in dependence on a consumer inflow pressure
Implementation Method 2
comprises at least one main piston arranged in a bushing as well as at least two further pistons arranged in a lid
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.