Camshaft Phaser Valve Spool Check Valve Integration
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Solution Overview
Problem
Existing camshaft phasers face challenges in implementing a check valve within the rotor for compactness and simplified oil passages, with issues related to seal integrity and wear between the check valve and insert.
Innovation Solution
A camshaft phaser design featuring a valve spool with a check valve and insert that remains static, utilizing a spring to maintain compression and ensure sealing, thereby simplifying construction and minimizing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the check valve is implemented within the rotor for compactness and simplified oil passages, then the device complexity is reduced, but the seal integrity and wear resistance deteriorate
Solution Approach 1:
The check valve is extracted from the rotor and relocated to the valve spool. This separates the check valve from the rotating component, eliminating the sealing and wear problems associated with implementing a check valve within the rotor while maintaining compactness through integration into the valve spool structure.
Solution Approach 2:
The valve spool serves as an intermediary structure that hosts the check valve. By placing the check valve in the valve spool rather than the rotor, the system maintains compact oil passages while avoiding the sealing and wear issues that would arise from integrating the check valve directly into the rotating rotor assembly.
2Device complexity
If the check valve is implemented within the valve spool with an insert, then the device complexity is reduced, but the wear between check valve and insert increases due to relative movement
Solution Approach 1:
The check valve and insert are merged into a single integrated component rather than separate parts. This eliminates the relative movement between the check valve and insert that would cause wear, thereby extending the service life of the camshaft phaser while maintaining simplified construction.
3Ease of manufacture
If the insert and check valve are not secured properly, then the ease of manufacture is improved, but the operational stability deteriorates due to relative movement
Solution Approach 1:
The check valve and insert are designed as a single integrated component, eliminating the need for separate assembly steps to secure them relative to each other. This maintains ease of manufacture while ensuring operational stability by preventing any relative movement between the check valve and insert during operation.
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 enhances the camshaft phaser's operational stability and longevity by maintaining the check valve and insert in a static position, ensuring effective fluid control and reducing wear, thus improving phase variation between the crankshaft and camshaft.
Implementation Method 1
a spring which urges the insert toward the insert retainer and holds the insert retainer in compression against the insert retainer
Implementation Method 2
a check valve within the valve spool bore, the check valve including a check valve member which moves between a seated position and an unseated position such that the check valve member prevents fluid flow out of the valve spool bore through a passage and such that the check valve member permits flow into the valve spool bore through the passage
Data Source
AI summary
A camshaft phaser includes an input member and an output member. A valve spool is moveable along an axis between an advance position and a retard position and includes a valve spool bore. A check valve within the valve spool bore includes a check valve member which moves between a seated position and an unseated position such that the check valve member prevents fluid flow out of the valve spool bore through a passage and such that the check valve member permits flow into the valve spool bore through the passage. An insert within the valve spool bore supports the check valve closes one end of the valve spool bore and abuts an insert retainer to retain the insert within the valve spool bore. A spring urges the insert toward the insert retainer and holds the insert retainer in compression against the insert retainer.