Cam Phaser Hydraulic Valve with Five-Position Flow Switching
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Solution Overview
Problem
Existing cam phaser systems face challenges in achieving a simple, compact, and efficient hydraulic valve configuration that improves cold operating properties and system performance, particularly in managing alternating and surging torques effectively.
Innovation Solution
A hydraulic valve design featuring a bushing with a movable piston, check valves, and annular bars that facilitate five switching positions, allowing for alternative connections between operating connections, supply connections, and tank drain connections, enabling efficient fluid flow management and throttling without control edges, thereby enhancing adjustment speed and performance in various temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a hydraulic valve with multiple switching positions and check valves is implemented, then adjustment speed and control quality are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated valve body structure. The bushing with piston, check valves, and annular bars are merged into one compact unit that provides five switching positions, throttling connections, and bypass functions simultaneously, reducing the number of separate components needed
Solution Approach 2:
The hydraulic valve is designed as a multi-functional device that can perform multiple operations: it provides five switching positions for different flow paths, includes check valves for bypass functions, offers throttling connections for controlled drainage, and enables direct oil exchange between chambers. This universal design allows one valve to replace what would traditionally require multiple separate components
2Reliability
If throttling connections are provided for draining hydraulic fluid, then cold operating properties are improved, but device complexity increases
Solution Approach 1:
The patent applies different flow control characteristics to different regions of the valve. The throttling connections provide restricted, controlled drainage paths with specific flow resistance, while other paths remain open for rapid flow. This local differentiation of flow characteristics allows optimized performance for cold conditions without requiring complete redesign of the entire valve structure
3Productivity
If five switching positions are implemented for fluid flow management, then system performance is improved, but device complexity increases
Solution Approach 1:
The valve employs a dynamic piston mechanism that can assume five distinct positions along its travel path, with each position enabling different fluid flow configurations. The dynamic movement of the piston and associated annular bars creates the multiple switching positions, allowing the system to adapt fluid paths based on operational requirements without complex mechanical linkages
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 solution provides improved adjustment speed in higher engine speed ranges, better control quality, and efficient operation in lower temperature conditions, while maintaining stable system performance and quick oil exchange, even with viscous cold oil, by enabling a bypass function and precise fluid flow control.
Implementation Method 1
a fluid path from the first operating connection to the second operating connection is openable by the check valve that is associated with the first operating connection under a pressure that exceeds a threshold value
Implementation Method 2
a bushing including a piston that is movable in a bore along a longitudinal direction
Implementation Method 3
a respective check valve is associated with the first operating connection and the second operating connection, and the first operating connection and the second operating connection are connectable through at least one of the check valves alternatively with each other and/or with the supply connection and/or with one of the tank drain connections
Data Source
AI summary
A hydraulic valve for a cam phaser, the hydraulic valve comprising: a bushing including a piston that is movable in a bore along a longitudinal direction; a supply connection for feeding a hydraulic fluid; a first operating connection and a second operation connection; and a first tank drain connection and a second tank drain connection configured to drain the hydraulic fluid, wherein a first check valve is associated with the first operating connection and a second check valve is associated with the second operating connection, and the first operating connection and the second operating connection are connectable through at least one of the first check valve and the second check valve alternatively with each other or with the supply connection or with the first tank drain connection or with the second tank drain connection by moving the piston, wherein the hydraulic valve includes five switching positions,