Control Valve Filter Integration in Camshaft Phaser
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Solution Overview
Problem
Existing control valves for camshaft phasers in internal combustion engines face challenges in achieving high actuating speeds with low flow resistance and a compact design, while also requiring effective filtration of pressurized fluid without increasing space or manufacturing complexity.
Innovation Solution
The control valve integrates a filter device within the valve piston cavity, utilizing a large filter cross-section that does not require additional space, and incorporates a blocking element to prevent backflow, with a design that minimizes flow resistance and supports high actuating speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter device is arranged in the valve inlet of the control valve, then the pressurized fluid is cleaned effectively, but the filter cross section is limited and additional installation space is required
Solution Approach 1:
The filter device is nested within the valve piston cavity, utilizing the existing internal space of the control valve. The filter element is positioned inside the cavity formed by the valve piston, allowing the pressurized fluid to be filtered as it flows through the cavity without requiring additional external space or reducing the filter cross section.
2Volume of moving object
If the control valve is designed with compact dimensions, then space is saved in the camshaft phaser, but the filter cross section for cleaning pressurized fluid is reduced
Solution Approach 1:
The filter device utilizes the axial dimension of the valve piston cavity rather than requiring additional radial or axial space outside the control valve. By positioning the filter element within the existing three-dimensional cavity space, the design maintains compact overall dimensions while providing sufficient filter cross section area for effective fluid cleaning.
3Reliability
If a blocking element is integrated into the control valve to prevent backflow, then operational safety is improved, but the device complexity increases
Solution Approach 1:
The blocking element is merged with the valve piston structure, forming an integrated component rather than a separate assembly. The blocking element is positioned within the valve piston cavity and works in conjunction with the valve piston movement to prevent backflow, thereby improving operational safety without significantly increasing overall device complexity.
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 enhances the cleaning efficiency of the pressurized fluid with low flow resistance, supports high actuating speeds, and maintains a compact, cost-effective structure, addressing the limitations of previous solutions.
Implementation Method 1
The control valve (10) has an integrated filter device (30) with a filter cross-section (35) through which the pressurized fluid is filtered
Implementation Method 2
arrange a blocking element, for example a non-return valve, in the pressurized fluid inlet of the phaser and thereby prevent one or more actuating chamber(s) of the phaser from expanding in the event of an in the actuating chamber(s)
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Control valve for controlling a pressure fluid, the control valve comprising: (a) a valve housing (10) with a valve inlet (P) for the pressure fluid, a control port (A, B) for connection to a unit to be operated with the pressure fluid and a valve outlet (TA, TB), (b) a valve piston (20) movable in the valve housing (10) along an axis (R) with a cavity (21) through which the pressure fluid can flow from the valve inlet (P) to the control port (A, B), (c) and a filter device (30) arranged in the control valve with a filter cross-section (35) through which the pressure fluid is filtered, wherein (d) the filter device (30) is located with at least a part of the filter cross-section (35) in the cavity (21) of the valve piston (20).