Integrated Cut-Off Switch Valve for Hydraulic Leakage Control
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Solution Overview
Problem
Existing switch over valves for hydraulic fluid flow in internal combustion engines suffer from leakage issues, leading to undesirable changes in piston rod length and compression ratio due to clearance between the contact element and the sleeve shaped connecting section.
Innovation Solution
Integration of cut off valves within the switch over valve, which are mechanically actuated by profile surfaces to control hydraulic fluid flow between different conduits and a relief channel, reducing leakage and enhancing sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clearance is provided between the contact element and the sleeve shaped connecting section to prevent binding, then ease of operation is improved, but hydraulic fluid leakage increases
Solution Approach 1:
The switch over valve is divided into functionally independent components: the contact element for switching and the cut-off valves for sealing. This segmentation allows the contact element to move freely with clearance for ease of operation, while the separate cut-off valves provide precise sealing to prevent hydraulic fluid leakage.
Solution Approach 2:
The cut-off valves act as intermediary sealing elements between the hydraulic fluid conduits and the relief channel. These intermediate components provide the necessary sealing function without interfering with the movement of the contact element, thus preventing leakage while maintaining ease of operation.
2Reliability
If hydraulic fluid leakage is reduced through better sealing, then reliability is improved, but device complexity increases due to additional cut off valves
Solution Approach 1:
The cut-off valves are integrated into the sleeve shaped connecting section, merging the sealing function with the existing structural component. This combination approach reduces overall device complexity by eliminating separate sealing components while maintaining improved reliability through the integrated cut-off valves.
Solution Approach 2:
The sleeve shaped connecting section serves multiple functions: it provides structural support, guides the contact element, and houses the cut-off valves for sealing. This multi-functionality reduces the need for additional separate components, thereby improving reliability without proportionally increasing device complexity.
3Adaptability or versatility
If the contact element is made movable for switching positions, then adaptability is improved, but hydraulic fluid leakage increases due to clearance requirements
Solution Approach 1:
The movable contact element is segmented from the sealing function, which is performed by the stationary cut-off valves. This allows the contact element to be adaptable and movable for switching between positions, while the separate cut-off valves maintain precise sealing to prevent hydraulic fluid leakage.
Solution Approach 2:
The cut-off valves serve as intermediary sealing components that are not affected by the movement of the contact element. These intermediate sealing elements prevent hydraulic fluid leakage while allowing the contact element to move freely for adaptability and switching capability.
Data Source
AI summary
A switch over valve, in particular for controlling a hydraulic fluid flow, comprising: a contact element; and a sleeve shaped connecting section including a first bore hole for connecting with a first hydraulic fluid conduit, a second bore hole for connecting with a second hydraulic fluid conduit, and a relief bore hole for connecting with a relief channel, wherein the contact element is arranged in the sleeve shaped connecting section and optionally displaceable into a first switching position or a second switching position, wherein the first hydraulic fluid conduit is connected with the relief channel in the first switching position and the second hydraulic fluid conduit is connected with the relief channel in the second switching position, characterized in that the cut off valves are provided which are integrated into the switch over valve.