Shock Absorber Damping Valve with Pilot-Controlled Stable Flow
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Solution Overview
Problem
Existing damping valve devices for motor vehicle shock absorbers suffer from unstable behavior during dynamic operation, create acoustic issues, and occupy excessive installation space, while being costly to produce.
Innovation Solution
A damping valve device with a main valve and pilot valve configuration, featuring a coil and axially movable armature, separate flow passages for the compression and traction phases, and a pilot-controlled pressure control valve, ensuring stable damping behavior and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damping valve device with main valve and pilot valve is used, then stable damping behavior is achieved, but device complexity increases
Solution Approach 1:
The damping valve device is divided into a main valve and a pilot valve, where the main valve handles the primary damping function and the pilot valve controls the main valve's opening/closing. This segmentation allows each valve to be simpler in structure while achieving stable overall performance through their coordinated operation.
2Volume of moving object
If a compact damping valve device is designed, then installation space is reduced, but manufacturing cost increases
Solution Approach 1:
The main valve and pilot valve are combined into a single integrated damping valve device with shared components and housing. This merging achieves compact dimensions for reduced installation space while using standardized manufacturing processes that control production costs.
3Adaptability or versatility
If the main valve is opened and closed during dynamic operation, then damping adjustment is achieved, but acoustic issues are created
Solution Approach 1:
The pilot valve acts as an intermediary that controls the opening and closing of the main valve in a controlled manner. By using the pilot valve to gradually build pressure and open the main valve, rather than direct actuation, the system reduces acoustic noise while maintaining damping adjustment capability.
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 a compact, cost-effective damping valve device with stable performance in both compression and traction phases, minimizing acoustic issues and optimizing space utilization.
Implementation Method 1
The damping valve device has a coil and an axially movable armature which is at least partially disposed within the coil
Implementation Method 2
a pilot valve which is designed and disposed in such a manner that it is able to be passed through by a flow of hydraulic fluid
Data Source
AI summary
A vibration damper of a motor vehicle comprises an outer tube and an inner tube which is disposed so as to be coaxial with the latter, and a working piston which is disposed so as to be axially movable within the inner tube and divides the interior of the inner tube into a piston rod-proximal working chamber and a piston rod-distal working chamber, a damping valve device which is disposed in the working piston, wherein the damping valve device has a coil, an axially movable armature which is at least partially disposed within the coil, a main valve having a main piston which separates a compression main control chamber, a traction main control chamber and a pilot control chamber from one another, a pilot valve which is designed in such a manner that it is able to be passed through by a flow of hydraulic fluid in the traction phase and in the compression phase and has a pilot working chamber and a sliding tappet that is disposed in the pilot working chamber and is axially movable by means of the armature, and a connecting duct which is disposed between the pilot control chamber and the pilot working chamber and fluidically connects those to one another, wherein the compression main control chamber by way of a first flow passage, and the traction main control chamber by way of a second flow passage, are fluidically connected to the pilot control chamber.