Integral Valve Assembly for VCT Systems
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Solution Overview
Problem
Existing valve technologies in variable camshaft timing (VCT) systems for internal combustion engines face inefficiencies in manufacturing and installation due to lack of integral construction between metal sleeves and check valves, leading to potential separation and rotational movement issues.
Innovation Solution
The implementation of a valve assembly with a metal sleeve and check valve featuring an integral construction, including overmolded and male-female mating designs, which prevents axial, radial, and rotational movement between components, enhancing manufacturing efficiency and ensuring proper alignment and fluid communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate metal sleeve and check valve components are used, then ease of manufacture is improved, but reliability deteriorates due to potential separation and rotational movement
Solution Approach 1:
The check valve base is integrally formed with the metal sleeve through overmolding, creating a unified component where the plastic base is molded directly onto the metal sleeve. This merging eliminates the interface between separate parts, preventing separation and rotational movement while maintaining manufacturing efficiency through a single-step overmolding process.
2Device complexity
If separate metal sleeve and check valve components are used, then device complexity is reduced, but manufacturing precision deteriorates due to alignment issues
Solution Approach 1:
The metal sleeve is prepared in advance with a precisely positioned recess that guides the overmolding process. This preliminary preparation ensures that the check valve base is molded at the exact correct location and orientation, eliminating alignment issues that would occur with separate components while maintaining relatively simple device structure.
3Reliability
If integral construction is implemented, then reliability is improved by preventing separation, but manufacturing complexity increases
Solution Approach 1:
The check valve base is nested within the metal sleeve through overmolding, where the plastic material is molded directly onto the metal sleeve surface. This nesting creates an integral construction that prevents separation and rotational movement, while the process remains manufacturable through a single integrated overmolding operation rather than multiple assembly steps.
4Manufacturing precision
If integral construction is implemented, then manufacturing precision is improved by ensuring alignment, but ease of manufacture deteriorates
Solution Approach 1:
The invention changes the material parameter by using plastic material for the check valve base that can be overmolded onto the metal sleeve. This material selection enables precise alignment through the molding process while maintaining ease of manufacture through a single-step overmolding operation that combines both components in one manufacturing process.
Data Source
AI summary
A valve assembly that can be employed in a variable camshaft timing (VCT) phaser assembly. The valve assembly includes a metal sleeve and a check valve. The check valve, in an implementation, has an integral construction with the metal sleeve. The integral construction has multiple designs, one of which includes an overmolded construction of the check valve with the metal sleeve. The valve assembly can also include a valve housing which, in the implementation of the VCT phaser assembly, is a center bolt.