Vibration Damper With Normally Open and Closed Valves
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Solution Overview
Problem
Existing vibration dampers for motor vehicles face high energy consumption due to 'normally closed' valves, which are not suitable for emergency running properties, while 'normally open' valves lack the necessary damping characteristics.
Innovation Solution
Configuring one damping valve as a 'normally closed' (NC) valve and the other as a 'normally open' (NO) valve, with the NC valve in the rebound stage to provide a hard characteristic for emergency running, allowing the NO valve to be used in the compression stage for energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 'normally closed' valves are used in vibration damper, then emergency running properties are improved, but energy consumption increases
Solution Approach 1:
The vibration damper is divided into two independent damping circuits: a first damping circuit with a normally closed valve for the rebound stroke and a second damping circuit with a normally open valve for the compression stroke. This segmentation allows each circuit to have optimized valve characteristics for its specific function, resolving the contradiction between emergency running properties and energy consumption.
Solution Approach 2:
Different valve types are assigned to different functional areas (damping circuits) based on local requirements. The rebound stroke circuit uses normally closed valves where emergency running properties are critical, while the compression stroke circuit uses normally open valves where energy efficiency is prioritized. This local differentiation resolves the contradiction by applying the appropriate valve type to each specific application area.
2Use of energy by moving object
If 'normally open' valves are used in vibration damper, then energy consumption is reduced, but emergency running properties deteriorate
Solution Approach 1:
The damping system is segmented into two independent circuits with different valve characteristics. The compression stroke circuit uses normally open valves to minimize energy consumption during regular operation, while the rebound stroke circuit uses normally closed valves to maintain emergency running properties. This segmentation resolves the contradiction by allowing each circuit to optimize for its primary requirement.
Solution Approach 2:
The valve type is selected based on local functional requirements of each damping circuit. Normally open valves are applied locally in the compression stroke circuit where energy efficiency is the priority, while normally closed valves are applied locally in the rebound stroke circuit where safety and emergency performance are critical. This local quality approach resolves the contradiction by matching valve characteristics to specific functional needs.
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
This configuration reduces energy consumption by using the more energy-efficient NO valve in the compression stage while ensuring sufficient damping through the hard characteristic in the rebound stage, enhancing emergency running properties.
Implementation Method 1
a first of the restoring means is arranged in such a way that said restoring means loads a first of the valve bodies into its open position, and a second of the restoring means is arranged in such a way that said restoring means loads a second of the valve bodies into its closed position
Implementation Method 2
The first damping valve is passed through by the damping liquid in the case of a retraction movement, and the second damping valve is passed through by the damping liquid in the case of an extension movement of the piston rod
Data Source
AI summary
A vibration damper for a motor vehicle may include a damper tube, a piston rod that moves in the damper tube, a working piston attached to the piston rod that divides the damper tube into two working spaces, and first and second damping valves each with an adjustable damping force. Damping liquid may pass through the first damping valve as the piston rod retracts and through the second damping valve as the piston rod extends. Each damping valve may include a valve body that can be moved by a separate, controllable drive device between a closed position and an open position to set a throughflow cross section of each respective damping valve. The valve bodies may be loaded by restoring means counter to an actuating force of the drive device. A first of the restoring means may load a first of the valve bodies into its open position, and a second of the restoring means may load a second of the valve bodies into its closed position.