Load Sensing Valve Groove Spool Dynamics
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Solution Overview
Problem
Existing load sensing valve devices face challenges in maintaining responsiveness during initial load variation in actuators while reducing processing costs, as forming an orifice within the second pressure introduction port is difficult and costly.
Innovation Solution
A load sensing valve device with a compensator spool that includes a pressure chamber, a compensator throttle portion, and a pressure introduction port with a groove that moves to reduce the opening area, allowing for accurate control of pressure introduction and reducing processing costs by eliminating the need for precise orifice formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an orifice is formed inside the second pressure introduction port to control pressure introduction, then responsiveness in tilt angle control during initial load variation is improved, but manufacturing precision and processing costs worsen due to the difficulty of accurately maintaining the orifice opening diameter
Solution Approach 1:
The patent transforms the static orifice structure into a dynamic one by making the opening area of the second pressure introduction port variable through the movement of the compensator spool. The compensator spool's position, controlled by pressure differential between the pressure chamber and maximum load pressure introduction chamber, dynamically adjusts the opening area to achieve both initial responsiveness and stable control.
Solution Approach 2:
The patent segments the pressure introduction function into two separate ports: the first pressure introduction port with a fixed large opening area for stable control, and the second pressure introduction port with a variable opening area for initial responsiveness. This segmentation allows each port to specialize in one aspect of the control requirements without compromise.
2Speed
If an orifice is formed inside the second pressure introduction port to control pressure introduction, then responsiveness in tilt angle control during initial load variation is improved, but processing costs worsen due to the difficulty and cost of precise orifice formation
Solution Approach 1:
The patent replaces the static precision orifice with a dynamic variable opening mechanism controlled by the compensator spool. This eliminates the need for expensive precision orifice formation processes while achieving the desired control characteristics through pressure-driven spool movement that naturally regulates flow.
Solution Approach 2:
The system uses the pressure differential between the pressure chamber and maximum load pressure introduction chamber to automatically control the compensator spool position and thus the opening area of the second pressure introduction port. This self-regulating mechanism eliminates the need for external control systems or precision-machined orifices, reducing manufacturing complexity and cost.
3Stability of the object's composition
If a fixed large opening area is used in the pressure introduction port, then stable control is improved, but responsiveness during initial load variation worsens
Solution Approach 1:
The patent divides the pressure introduction function into two separate ports with different characteristics: the first pressure introduction port provides stable control through its fixed large opening area, while the second pressure introduction port provides initial responsiveness through its variable opening area controlled by the compensator spool.
Solution Approach 2:
The patent introduces dynamic control through the compensator spool that adjusts the opening area of the second pressure introduction port based on pressure differential. This allows the system to transition from a static fixed-opening design to a dynamic variable-opening design that adapts to different operating conditions.
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
The device enhances responsiveness in tilt angle control during initial load variation and stabilizes control by maintaining constant flow dividing ratios across varying load pressures, while simplifying processing and reducing costs through groove formation on the compensator spool.
Implementation Method 1
The compensator spool is kept at a position in which pressure guided from the relay port 24 to the pressure chamber 21 is balanced with a maximum load pressure guided towards the maximum load pressure introduction chamber 22
Implementation Method 2
A groove is formed around the pressure introduction port 32, and the groove moves relatively between a passage communicating with the actuator to reduce an opening area of the pressure introduction port 32 when the compensator spool moves
Data Source
AI summary
A compensator spool of a load sensing valve device includes a pressure chamber, a compensator throttle portion, a pressure introduction chamber, a pressure introduction port, a maximum load pressure introduction chamber, and a selector valve. A groove is formed around the pressure introduction port, and a groove moves relatively between a passage communicating with an actuator to reduce an opening area of the pressure introduction port when the compensator spool moves.