Frequency-Selective Vibration Damper With Low-Speed Bypass Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vibration dampers face issues with insufficient volume flow at low damper speeds, lack of closed-loop control for bypass flow, and a non-compact design, particularly in low-frequency excitations with small amplitudes.
Innovation Solution
A frequency-selective vibration damper with a bypass control valve system, featuring a damper tube filled with damping fluid, a movable piston rod, and a damping module that includes a control piston and disk valve assembly. The control piston allows for independent control of the bypass flow, enabling parallel fluid flow through the comfort and bypass paths, and includes a pressure chamber with an inlet and outlet for efficient fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a disk valve assembly is arranged in the main flow, then the damping force can be controlled, but at low damper speeds the volume flow is insufficient to open the valve
Solution Approach 1:
The damping module is segmented into multiple independent valve assemblies (comfort valve assembly and bypass valve assembly), each capable of operating independently. This allows the bypass valve to be activated at lower speeds while the comfort valve handles higher speed conditions, resolving the contradiction between low-speed responsiveness and high-speed damping control.
Solution Approach 2:
A bypass channel with an adjustable bypass valve serves as an intermediary flow path that activates at lower volume flows. This bypass channel mediates between the insufficient main flow at low speeds and the need for damping control, allowing the system to respond effectively across a broader speed range.
2Device complexity
If a bypass path is fixedly defined, then the structure is simple, but no closed-loop control of bypass flow is possible
Solution Approach 1:
The bypass valve is designed with dynamic control capabilities, allowing it to adjust the bypass flow rate based on operating conditions. The valve can transition between fully closed, partially open, and fully open states, enabling closed-loop control of bypass flow while maintaining a relatively simple structural implementation.
3Reliability
If the outlet is arranged downstream of the valve arrangement, then the pressure chamber can be sealed, but the design occupies more space
Solution Approach 1:
The outlet is positioned within the valve assembly structure itself, with the valve body and outlet arrangement nested together. This allows the pressure chamber to remain sealed while minimizing the overall volume required, as the outlet integrates with the existing valve components rather than requiring separate external arrangements.
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 design achieves short response times without comfort losses, even in low-frequency excitations, and allows for a compact, space-efficient vibration damper with improved control over bypass flow, enhancing overall driving characteristics.
Implementation Method 1
a control piston (8), which is received, such that it can perform stroke movements, in the damping module and which, remote from the piston rod, delimits a pressure chamber (9) arranged in the damping module
Implementation Method 2
via which damping fluid can be caused to flow hydraulically in parallel with respect to the flow through the working piston (4)
Implementation Method 3
The control arrangement comprises a control piston, wherein the stroke of the control piston imparts a preload via a spring element to a spring washer valve in the main flow
Implementation Method 4
a vibration damper with a frequency-dependent damping force characteristic curve
Data Source
AI summary
The present invention relates to a vibration damper (1) comprisinga damper tube (2) which is at least partially filled with damping fluid and in which a piston rod (3) is movable back and forth, wherein a working piston (4) is movable jointly with the piston rod (3), by means of which working piston the interior space of the damper tube is divided into a piston-rod-side working space (5) and a piston-rod-remote working space (6),a damping module (7) for the frequency-dependent control of a comfort bypass which is formed between the piston-rod-side working space (5) and the piston-rod-remote working space (6) and which comprises a comfort path via which damping fluid can be caused to flow hydraulically in parallel with respect to the flow through the working piston (4),a control piston (8) which is received, such that it can perform stroke movements, in the damping module (7) and which, remote from the piston rod, delimits a pressure chamber (9) arranged in the damping module (7), wherein the pressure chamber (9) comprises at least one inlet (10),wherein the damping module (7) comprises a damping module housing, with a housing cover (11) arranged at the piston rod side and with a housing pot (12) arranged remote from the piston rod, comprises the control piston (8) and comprises at least one first disk valve assembly (13), wherein the at least one first disk valve assembly (13), in the comfort path with the housing cover (11), forms a comfort valve, and the at least one first disk valve assembly (13) comprises at least one bypass control valve with at least one bypass inlet opening (16), wherein, via the at least one bypass control valve, bypassing the comfort valve, damping fluid can be caused to flow via a bypass control path hydraulically in parallel with respect to the flow through the working piston (4), wherein the bypass control valve is controlled by means of the stroke of the control piston (8) and wherein the disk valve assembly (13) comprises at least one bypass disk (17) with at least one bypass disk opening (18), comprises at least one spacer disk (19) and comprises a comfort disk (20).