Axial Piston Pump Control Valve Filtration Against Slide Contamination
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Solution Overview
Problem
Existing control valves for axial piston pumps suffer from contamination by dirt particles, leading to increased wear and poor control precision due to stick-slip effects on the valve slide and control magnet, affecting the displacement volume and regulation of the pump.
Innovation Solution
A cap filter is arranged perpendicularly to the housing's main outer surface in a blind bore, with the control pressure channel opening at an angle, and an intermediate ring supports the cap filter to prevent dirt particles from reaching the valve slide, ensuring precise adjustment and protection against contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the control pressure channel is opened directly to the housing outer surface, then the structure is simple and easy to manufacture, but dirt particles can enter the control pressure channel and reach the valve slide causing contamination and wear
Solution Approach 1:
A cap filter is introduced as an intermediary component between the control pressure channel opening and the valve slide. The cap filter has a filtering surface that intercepts dirt particles while allowing control pressure to pass through, thus protecting the valve slide from contamination without complicating the basic channel structure
Solution Approach 2:
The cap filter is arranged perpendicular to the main outer surface of the housing, extending in a direction transverse to the main flow path. This dimensional arrangement allows the filter to intercept particles from multiple angles while maintaining a compact structure that does not significantly increase the overall channel complexity
2Object-affected harmful factors
If the cap filter is arranged perpendicular to the main outer surface in a blind bore, then dirt particles are effectively filtered, but the housing structure becomes more complex requiring blind bores and angled control pressure channels
Solution Approach 1:
The cap filter serves multiple functions simultaneously: it filters dirt particles from the control pressure, structurally supports itself within the blind bore without requiring additional mounting hardware, and the housing groove provides both structural support and sealing functionality. This multi-functionality reduces the need for separate components and simplifies the overall structure despite the perpendicular arrangement
Solution Approach 2:
The cap filter is designed to be self-supporting within the blind bore, using its own structural integrity to maintain its perpendicular position. The housing groove automatically provides both mechanical support and sealing, eliminating the need for additional mounting features or sealing components
3Object-affected harmful factors
If the control pressure channel opens at an angle to penetrate the blind bore, then the cap filter can be positioned effectively to prevent contamination, but the manufacturing precision requirements increase due to the angled opening
Solution Approach 1:
The cap filter acts as a mediator that decouples the precise positioning requirement from the control pressure channel. Instead of requiring the channel itself to be precisely positioned at an angle, the cap filter's filtering surface provides the precise interception point, while the channel can open at a more manufacturable angle into the blind bore
4Productivity
If dirt particles are present in the control pressure channel, then wear increases on the valve slide and control magnet, but continuing operation without filtration reduces system reliability and control precision
Solution Approach 1:
The cap filter performs preliminary action by filtering dirt particles from the control pressure before they can enter the control pressure channel and reach the valve slide. This preventive filtration maintains system reliability and control precision over extended operation periods, allowing continuous productivity without the need for frequent maintenance or system shutdowns
Data Source
AI summary
A stroke-volume adjustable axial piston pump control valve includes a valve slide arranged in an axially displaceable manner in a housing of the control valve to optionally connect a feed pressure channel, which can be connected to a tank and is arranged and/or formed in the housing, to a control pressure channel, which can be connected to a control pressure chamber of the pump and is arranged and/or formed in the housing. The control valve and/or adjoining components are protected from contamination by a cap filter arranged substantially perpendicularly to a main outer surface of the housing formed substantially in one plane in a blind bore of the housing, and the control pressure channel opens into the main outer surface of the housing at an angle such that the control pressure channel penetrates the blind bore in a mouth region of the control pressure channel adjoining the main outer surface.