Hydraulic Pilot Valve Damping Structure for Uniform Response
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Solution Overview
Problem
Conventional hydraulic pilot valves experience vibration and impact issues during sudden operations, leading to non-uniform responses and precise control challenges, and require extensive time and resources for manufacturing and assembly, with defects and misaligned flow passages being common.
Innovation Solution
A hydraulic pilot valve design incorporating a damping unit with a central pipeline, auxiliary chamber, and pin orifices that manage hydraulic oil flow to reduce vibration and noise, facilitating integral processing and minimizing chip accumulation, while maintaining a damping effect through continuous oil storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hydraulic pilot valve is used, then the valve can operate the actuator, but vibration is generated and response becomes non-uniform during sudden operations
Solution Approach 1:
The patent applies beforehand cushioning by providing a damping chamber and damping hole that create a cushioning effect before sudden operations occur. The damping chamber is pre-filled with hydraulic oil that acts as a cushion to absorb sudden pressure changes and vibrations, ensuring uniform response during lever operations.
Solution Approach 2:
The patent uses an intermediary approach by introducing a damping chamber and damping hole as intermediate structures between the main hydraulic flow paths. These intermediary elements mediate the hydraulic oil flow to reduce vibrations and noise without interfering with the primary actuation function.
2Reliability
If a pipe is formed inside the spool to implement damping function, then damping effect is achieved, but manufacturing time and expenses increase
Solution Approach 1:
The patent extracts the damping function from the spool by providing a separate damping chamber and damping hole in the valve body. This separation allows the damping function to be implemented without modifying the spool structure, thereby reducing manufacturing complexity and time.
Solution Approach 2:
The patent merges the damping function with the valve body structure by forming the damping chamber and damping hole directly in the valve body. This integration eliminates the need for separate damping components and reduces assembly steps, thereby reducing manufacturing time and expenses.
3Ease of manufacture
If two-piece or three-piece valve body is used, then assembly is possible, but flow passages are not parallel and manufacturing defects occur
Solution Approach 1:
The patent merges the valve body into a single integral structure with all flow passages formed directly in the valve body. This ensures precise parallel alignment of flow passages while maintaining ease of manufacture through integral forming processes, eliminating the need for multi-piece assembly.
4Productivity
If integral valve body is manufactured, then manufacturing time and expenses are reduced, but damping function implementation is challenging
Solution Approach 1:
The patent merges the damping function with the integral valve body by forming the damping chamber and damping hole directly in the valve body during the integral manufacturing process. This integration maintains manufacturing efficiency while successfully incorporating the damping function into the single-piece structure.
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 solution effectively minimizes vibration and noise during sudden operations, enabling precise control, reducing manufacturing time and costs, and preventing foreign substance malfunctions by ensuring parallel flow passages and continuous damping.
Implementation Method 1
a damping unit formed on one side of the valve chamber to communicate an area of the valve chamber and the central pipeline with each other
Implementation Method 2
at least some of the hydraulic oil supplied to the supply chamber flows to the valve chamber or the central pipeline through the damping unit according to the elevation of the spool
Data Source
AI summary
Disclosed is a hydraulic pilot valve which is provided with an orifice so as to reduce vibration of a valve and minimize impact applied to a valve even when a valve is suddenly operated. At least some of hydraulic oil supplied to a supply chamber flows to a valve chamber or a central pipeline through a damping unit according to elevation of a spool.