Hydraulic Valve for Cam Phaser with Angled Divider Wall
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Solution Overview
Problem
Hydraulic valves for cam phasers have a slow reaction time due to inefficient fluid distribution and pressure management, which affects the speed of cam phaser operation in internal combustion engines.
Innovation Solution
A hydraulic valve design featuring a hollow cylindrical piston with a divider wall at an angle less than 90°, including overflow openings and check valves to facilitate fluid flow between supply and drain channels, allowing hydraulic fluid to be redirected from a pressure-reducing to a pressure-increasing consumer, thereby reducing reaction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If hydraulic fluid is directed exclusively to the tank drain, then pressure management is simplified, but the filling speed of pressure chambers decreases and reaction time increases
Solution Approach 1:
The fluid distribution system is segmented into multiple pathways: a primary drain channel for pressure reduction and an overflow channel for direct filling. This segmentation allows simultaneous pressure management and rapid filling, resolving the contradiction between simplified pressure management and fast reaction time.
Solution Approach 2:
The overflow channel acts as an intermediary pathway that enables direct fluid connection between the supply channel and pressure chambers, bypassing the tank drain. This intermediary route accelerates filling without compromising the pressure management function of the drain channel.
2Productivity
If an overflow opening is added to provide direct fluid connection, then filling speed increases and reaction time decreases, but device complexity increases
Solution Approach 1:
The overflow opening is merged into the divider wall structure of the piston, combining the functions of fluid separation and overflow routing in a single structural element. This integration increases filling speed while minimizing the increase in device complexity.
Solution Approach 2:
The divider wall is designed with multi-functionality: it separates the supply channel from the drain channel while simultaneously incorporating the overflow opening. This universal structure performs multiple functions without requiring separate components, thus increasing productivity with minimal complexity increase.
3Reliability
If the divider wall is positioned at a steep angle, then fluid separation between supply and drain channels is improved, but overflow capability and filling speed are reduced
Solution Approach 1:
The angle of the divider wall is optimized to balance fluid separation reliability and overflow capability. By adjusting this geometric parameter, the system achieves both effective channel separation and sufficient overflow cross-section for rapid filling, resolving the contradiction between reliability and speed.
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 design significantly reduces the reaction time of the cam phaser by enabling quicker filling of pressure chambers and preventing uncontrolled fluid overflow, enhancing the operational efficiency of the cam phaser.
Implementation Method 1
the divider wall includes an overflow opening configured to provide a flow connection of the supply channel and the drain channel
Implementation Method 2
the overflow opening is openable or closable by a check valve
Data Source
AI summary
A hydraulic valve for a cam phaser, the hydraulic valve including a housing; a hollow cylindrical piston that is axially movable in a central opening of the housing that extends along a longitudinal axis of the housing and that includes shoulders; a supply connection configured to feed a hydraulic fluid; a first operating connection; a second operating connection; a tank connection, wherein one of the first operating connection and the second operating connection is connectable with the supply connection and another of the first operating connection and the second operating connection is connectable with the tank connection as a function of an axial position of the hollow cylindrical piston, wherein the hollow cylindrical piston includes a feed channel configured to connect with the supply connection and a drain channel configured to connect with the tank connection, wherein a divider wall is configured between the supply connection and the tank connection.