Hydraulic Valve Guide Surfaces for Spool Alignment
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Solution Overview
Problem
Hydraulically striking device valves face issues such as spool misalignment and wear due to inadequate guidance, increased manufacturing costs from complex channel arrangements, and potential housing weakness under high pressure, leading to operational malfunctions and increased size requirements.
Innovation Solution
The valve design incorporates concentric guide surfaces within the housing to center the moving member, allowing for reduced radial movement and increased material thickness in critical areas, enabling axial channel integration without size increases and enhancing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the spool is not guided near the ends of the spool, then the valve structure is simpler, but the spool may get stuck or wear more due to radial movement
Solution Approach 1:
The guide surfaces are segmented into two distinct locations: one set near the first end of the spool and another set near the second end. This segmentation allows the spool to be guided at critical positions without requiring continuous guidance along the entire length, thus maintaining operational reliability while avoiding excessive structural complexity
Solution Approach 2:
The guide surfaces are positioned to preemptively center the spool before it reaches positions where radial movement could cause sticking or wear. By providing guidance in advance at the ends of the spool, the design prevents problematic radial movements from occurring in the first place
2Volume of stationary object
If axial channels are arranged outside the valve into the hydraulically striking device housing, then the valve size can be reduced, but the manufacturing cost and circuit complexity increase
Solution Approach 1:
The valve housing and hydraulically striking device housing are merged into a single integrated structure. Axial channels are drilled through both components as one unified piece, allowing the channels to extend from the valve housing into the striking device housing without requiring separate manufacturing steps or additional sealing interfaces. This merging maintains compact valve size while simplifying manufacturing
Solution Approach 2:
The unified housing structure serves multiple functions: it acts as both the valve housing and the hydraulically striking device housing, while also providing the pathway for axial channels. This multi-functionality eliminates the need for separate components and reduces overall manufacturing complexity
3Volume of stationary object
If the material thickness in the housing is reduced to minimize size, then the valve is more compact, but the housing may crack under high pressure due to material fatigue
Solution Approach 1:
The housing exhibits varying material thickness with different local qualities: thicker sections are positioned at critical locations subject to high stress and pressure spikes, while thinner sections are used in non-critical areas. This localized variation in thickness optimizes the balance between compactness and structural strength, preventing cracks at stress concentration points while maintaining overall compact dimensions
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 design improves the reliability and durability of the valve by minimizing spool misalignment and wear, reducing manufacturing costs, and enhancing the structural integrity of the housing, ensuring stable operation under high pressures.
Implementation Method 1
the rest of the inner surface of the housing in the same axial positions of the return space and the pressure space forms guide surfaces that are concentric with the moving member and against the moving member for centering the moving member
Implementation Method 2
The moving member controls the fluid flow that is needed for moving the piston. The valve is operated by means of hydraulic pressure
Data Source
AI summary
A valve of a hydraulically striking device having a housing, the housing comprising a moving member being seated inside the housing to move in a reciprocating manner by means of a hydraulic fluid. The moving member has an inner space, the valve has a return space and a pressure space provided, in the axial direction, at a distance from one another on the inner surface of the housing facing the moving member, wherein the rest of the inner surface of the housing in the same axial positions of the return space and the pressure space forms guide surfaces that are concentric with the moving member and against the moving member for centering the moving member.