Vibration Damper Valve Preloading for Stable Electromagnetic Switching
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Solution Overview
Problem
Existing vibration dampers in motor vehicles face challenges in maintaining consistent electromagnetic switching functions due to manufacturing tolerances and positional inaccuracies of valve components, which affect the damping characteristics and overall driving comfort and safety.
Innovation Solution
A valve device with a preloading element and spring element that interact with the armature to counteract or complement the magnetic force, allowing for adjustment to compensate for manufacturing tolerances and positional inaccuracies, thereby optimizing the electromagnetic switching function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adjustable electromagnet is used to compensate for manufacturing tolerances, then the switching function can be adjusted for some influencing variables, but not all possible influencing variables can be compensated
Solution Approach 1:
The patent applies parameter changes by adjusting the magnetic circuit geometry through the adjustable armature position. By changing the air gap distance between the electromagnet and armature, the magnetic force can be precisely controlled to compensate for various influencing variables including manufacturing tolerances, ensuring complete compensation capability for all switching function parameters
2Reliability
If the armature position is adjusted to compensate for manufacturing tolerances, then the electromagnetic switching function is improved, but additional adjustment mechanisms and complexity are introduced
Solution Approach 1:
The valve component serves multiple functions: it acts as both the magnetic armature and the adjustment mechanism. By making the valve component displaceable along the longitudinal axis, it simultaneously controls fluid flow and adjusts the electromagnetic gap, eliminating the need for separate adjustment mechanisms and reducing overall device complexity
Solution Approach 2:
The system achieves self-adjustment through the interaction between the electromagnetic force and spring force. The valve component automatically positions itself to balance these forces, compensating for manufacturing tolerances without requiring external adjustment mechanisms, thereby reducing device complexity while maintaining reliability
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 ensures a consistent and optimized electromagnetic switching function, improving damping force settings and enhancing driving comfort and safety by compensating for manufacturing variations and positional inaccuracies.
Implementation Method 1
at least one valve drive (11) which comprises at least one coil (12), at least one ferromagnetic armature (13) that can be actuated by the coil (12)
Implementation Method 2
at least one spring element (17) that is supported on the preloading element (16) and that interacts with the armature (13) in such a way that, upon actuation of the armature (13), the spring element (17) applies a spring force counter to a displacement movement, in particular an extension direction, of the armature (13)
Data Source
AI summary
A valve device for a vibration damper comprises at least one valve drive which includes at least one coil, at least one ferromagnetic armature which can be actuated by the coil, and at least one housing part, in particular a pole tube, wherein the armature and the housing part have a common longitudinal axis, and the armature is arranged axially displaceably in the housing part, wherein the armature is adapted to interact with a valve slide of the valve device for throughflow control and/or for pressure control of the damper fluid. The valve device comprises at least one preloading element which is fastened in and/or to the housing part, and at least one spring element which is supported on the preloading element and interacts with the armature in such a way that, upon actuation of the armature, the spring element applies a spring force counter to a displacement direction of the armature or in a displacement direction of the armature.