Vibration Damper Rebound Valve Control Across Displacement Speeds
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Solution Overview
Problem
Existing vibration dampers for vehicles, such as motorcycles, face challenges in maintaining optimal damping performance across varying road surfaces and displacement speeds, leading to reduced driving comfort and loss of propulsive force during high displacement speeds, as they struggle to adjust damping characteristics independently for compression and rebound movements.
Innovation Solution
A vibration damper design featuring a cylinder with an axially movable piston, a piston rod with axial passages, and adjustable valve devices that allow independent adjustment of flow openings for compression and rebound damping, utilizing an adjusting needle that shifts with fluid pressure to optimize damping fluid flow based on displacement speed, ensuring improved response behavior and reduced time phases without propulsive force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high damping work is performed by the compression stage at high displacement speed, then damping performance is improved, but shock load on the rear wheel increases and the wheel cannot follow road surface irregularities
Solution Approach 1:
The compression damping is segmented into two independently adjustable stages: a first compression stage for low displacement speeds and a second compression stage for high displacement speeds. This allows separate optimization of damping characteristics for different operating conditions, preventing excessive shock loads during high-speed compression while maintaining adequate damping performance.
Solution Approach 2:
The vibration damper incorporates dynamic adjustment capabilities through adjustable valve devices that can adapt damping characteristics to varying displacement speeds. The system transitions between different damping modes based on operating conditions, enabling the rear wheel to follow road surface irregularities more effectively while maintaining control.
2Speed
If damping characteristics are adjusted for high displacement speeds, then control during high-speed movement is improved, but damping performance at low displacement speeds may be compromised
Solution Approach 1:
The rebound damping is segmented into two independently adjustable stages: a first rebound stage for low displacement speeds and a second rebound stage for high displacement speeds. This segmentation enables independent optimization of damping characteristics for each speed range, ensuring reliable damping performance across the entire operating spectrum without compromising either low-speed comfort or high-speed control.
3Device complexity
If a single adjusting device is used for both compression and rebound damping, then device complexity is reduced, but independent adjustment of compression and rebound damping is not possible
Solution Approach 1:
The adjusting mechanism is segmented into separate adjusting devices for compression damping and rebound damping, with each device independently controlling its respective damping stage. This segmentation enables precise independent adjustment of compression and rebound characteristics, providing superior adaptability to different driving conditions and rider preferences.
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 enhances driving comfort by adjusting damping characteristics dynamically, reducing time phases without propulsive force transmission and maintaining control during high displacement speeds, thereby improving vehicle handling and stability across different road surfaces.
Implementation Method 1
the adjusting needle has a differential area acted upon by the pressure of the damping fluid in the second working chamber such that the pressure acts upon the adjusting needle for axial displacement of the adjusting needle in the opening direction of the second flow opening
Implementation Method 2
a fluid communication passage for the flow of the working fluid in the form of the damping fluid, which is established during the rebound movement of the vibration damper
Data Source
Figure 1
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AI summary
A vibration damper (1) is provided with a cylinder (2) designed to receive damping fluid and a working piston (3) axially movable therein, which is guided on a piston rod (4) designed with an axial passage (19) and divides the cylinder interior into a first (15) and a second (16) working chamber, and the vibration damper (1) has a fluid communication passage (20) that at least partially axially penetrates the piston rod (4) for a fluid flow at least from the second working chamber (16) to the first working chamber, and has a first adjusting device (25) for adjusting the compression stage damping and a second adjusting device (35) for adjusting the rebound stage damping, and the first adjusting device (25) has two valve devices (26, 27) adjustable for changing flow openings for the compression stage.and the second adjusting device (35) has an adjusting rod (38) slidably arranged in the axial passage (19) of the piston rod (4) for changing a first flow opening (43) of a third valve device (36) for the rebound stage, wherein the second adjusting device (35) has a fourth valve device (44) adjustable separately from the third valve device (36) with an adjusting needle (48) which is provided for changing a second flow opening (49) for the rebound stage.