Camshaft Adjuster Filter Frame with Variable Cross-Section Legs
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Solution Overview
Problem
Existing filter arrangements for camshaft adjusters in internal combustion engines are not reliably installed, leading to deformation and instability during installation, which affects the uniform contact with the control valve and can result in torsion and bending issues.
Innovation Solution
A filter arrangement with a ring-shaped frame having legs with a cross-sectional profile that changes constantly in the peripheral direction to adapt to bending tension, ensuring uniform resistance to bending moments and minimizing deformation during installation, thus providing a stable and uniform contact with the control valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter arrangement is installed on a control valve for a camshaft adjuster, then the flow of hydraulic medium can be filtered, but the frame legs may deform and become unstable during installation
Solution Approach 1:
The cross-section of the frame legs is designed with varying properties along their length. Specifically, the cross-sectional area and shape change continuously from the base to the tip, creating local variations in stiffness and strength that adapt to the bending moment distribution during installation, preventing deformation while maintaining installation stability
Solution Approach 2:
The geometric parameters of the frame leg cross-section are continuously changed along the length of the leg. The cross-sectional dimensions, shape, or orientation are modified to create a gradient structure that optimizes the leg's resistance to bending moments, ensuring uniform contact with the control valve and preventing torsion during installation
2Ease of manufacture
If the frame legs have constant cross-section, then manufacturing is simpler, but the legs experience non-uniform bending stress and deform during installation
Solution Approach 1:
Instead of a constant cross-section, the frame legs are designed with locally varied cross-sectional properties that change along their length. This creates regions of different stiffness and strength that match the local bending moment requirements, ensuring uniform contact with the control valve surface while maintaining manufacturability through controlled geometric progression
3Reliability
If the filter arrangement is rigidly fixed, then contact with the control valve is stable, but torsion and bending issues occur during installation
Solution Approach 1:
The frame leg cross-section is designed to dynamically adapt its stiffness characteristics along its length. The varying cross-sectional properties create a gradient structure that provides appropriate flexibility during installation to prevent torsion, while maintaining stable contact with the control valve once installed
Data Source
AI summary
A filter arrangement (2) of a control valve (1) for a camshaft adjuster is provided in which the filter arrangement (2) has a filter (3) and a frame (4) with two articulated legs (5, 6) that are each provided with a change in cross section in a peripheral direction (10), so that the resistance to bending moments of each of the legs (5, 6) is constant along the entire leg (5, 6).