Regulable Vibration Damper Bypass Duct Design
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Solution Overview
Problem
Existing vibration dampers for vehicle chassis require costly configurations to achieve different bypass throughflow cross sections for efficient damping behavior, especially at low piston speeds, and often necessitate specific designs of valve disks and pistons.
Innovation Solution
A regulable vibration damper design featuring a bypass duct formed by outflow passages with one-way valves and bypass throttles, allowing for adjustable bypass cross sections without altering the valve disks or piston configuration, enabling separate damping adjustments for both throughflow directions in a cost-effective manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different bypass throughflow cross sections are implemented for the two throughflow directions, then damping behavior can be optimized for both compression and rebound stages, but the device complexity and manufacturing costs increase due to requiring specific piston designs and multiple valve disks
Solution Approach 1:
The bypass duct is designed to serve multiple functions: it provides bypass flow for both compression and rebound stages, and the single valve disk controls flow in both directions through its interaction with the bypass duct geometry. This eliminates the need for separate valve disks for each direction, reducing device complexity while maintaining the ability to optimize damping behavior for both stages
Solution Approach 2:
The invention merges the functions of multiple valve disks and separate bypass channels into a single integrated valve disk and bypass duct system. The bypass duct is formed as an integral part of the piston structure, combining the bypass function with the piston body, while the single valve disk controls both compression and rebound bypass flow, simplifying the overall device complexity
2Adaptability or versatility
If different bypass throughflow cross sections are implemented for the two throughflow directions, then damping behavior can be optimized for both compression and rebound stages, but manufacturing costs increase
Solution Approach 1:
The bypass duct is designed to serve multiple functions: it provides bypass flow for both compression and rebound stages, and the single valve disk controls flow in both directions through its interaction with the bypass duct geometry. This eliminates the need for separate valve disks for each direction, reducing device complexity while maintaining the ability to optimize damping behavior for both stages
Solution Approach 2:
The invention merges the functions of multiple valve disks and separate bypass channels into a single integrated valve disk and bypass duct system. The bypass duct is formed as an integral part of the piston structure, combining the bypass function with the piston body, while the single valve disk controls both compression and rebound bypass flow, simplifying the overall device complexity
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 solution allows for distinct damping behavior adjustments at low piston speeds without additional costs, using existing components like one-way valves and outflow passages, effectively managing damping forces across both compression and rebound stages.
Implementation Method 1
comprises a first valve arrangement which comprises a first outflow-passage bypass throttle and a one-way valve connected in parallel therewith, wherein the blocking direction of the one-way valve is oriented into the bypass duct
Implementation Method 2
comprises a first valve arrangement which comprises a first outflow-passage bypass throttle and a one-way valve connected in parallel therewith
Implementation Method 3
The pilot pressure forces the disks of the damping valves into their closed position
Implementation Method 4
The valve disks give the vibration damper usually a degressive damping behavior at high piston speeds, at which the valve disks end up being raised off from the valve seat. The opening cross section here increases as speed increases
Data Source
AI summary
A regulable vibration damper may comprise a cylinder barrel that contains hydraulic fluid in a sealed manner, a piston that can be moved axially within the cylinder barrel along a cylinder barrel axis and that subdivides the cylinder barrel into two working chambers, a piston rod that is oriented parallel to the cylinder barrel axis and is connected to the piston, a valve assembly arranged at a fluid feed through to damp piston movement in an actuating direction, and a bypass duct between the two working chambers. The bypass duct may comprise a first throughflow cross section for a first throughflow direction, wherein the first throughflow cross section differs from a second throughflow cross section for a second throughflow direction. Further, the bypass duct may be formed, at least in part, by an outflow passage that is arranged on an exit side of a pilot valve for adjusting pilot pressure.