Adjustable Damping Valve Segmented Pressurized Surface
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Solution Overview
Problem
The existing adjustable damping valves have a limited characteristic spread for damping force characteristics, particularly for one flow direction, which is not adequately addressed by increasing the preloaded valve spring, as it also increases the opening force in the opposite direction, leading to undesirable operating behavior.
Innovation Solution
The introduction of an additional pressurized surface effective in the closing direction, connected via a channel with a throttling point and a check valve, allows for a larger opening pressure and increased damping force without altering the valve spring or actuator force, thereby enhancing the spread of damping force characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the preloaded valve spring is increased to achieve a larger spread of damping force characteristics, then the damping force spread is improved, but the opening force in the opposite direction increases leading to undesirable operating behavior
Solution Approach 1:
The pressurized surface is segmented into two independent areas: a first pressurized area (AöD) that remains unchanged and a second additional pressurized area (AöD2) that is selectively pressurized only in one flow direction. This segmentation allows the damping force characteristics to be adjusted without affecting the opening force in the opposite direction, as the second pressurized area is isolated by a check valve that prevents pressure transmission in the reverse flow direction.
2Force
If the valve spring force is increased to achieve higher damping force, then the damping force is improved, but the energy consumption increases
Solution Approach 1:
The invention uses hydraulic pressure from the damping medium to generate the additional closing force on the second pressurized area. Instead of increasing the mechanical valve spring force, the system utilizes fluid pressure transmitted through a channel connection to the additional pressurized area, thereby achieving higher damping force without proportionally increasing energy consumption in the valve spring.
3Force
If the opening pressure is increased to achieve larger damping force, then the damping force is improved, but the manufacturing precision requirements increase
Solution Approach 1:
A check valve is introduced as an intermediary component that mediates the pressure transmission to the second additional pressurized area. The check valve selectively allows pressure to act on the second pressurized area only in one flow direction while preventing pressure transmission in the opposite direction. This intermediary component isolates the second pressurized area from the first, reducing the sensitivity to manufacturing tolerances of the pressurized areas.
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 a significantly larger bandwidth of damping force characteristics with unchanged valve spring and actuator force, reducing sensitivity to manufacturing tolerances and allowing precise adjustment of lifting forces, while maintaining simplicity and independence of pressurization for different flow directions.
Implementation Method 1
The channel connection has a check valve (45) that closes in the flow direction towards the through-opening (25)
Implementation Method 2
A throttling point (43) is provided within the channel connection (41)
Implementation Method 3
An axially movable valve body (9) is biased in the closing direction on a valve seat surface (7) of the valve seat ring by means of a valve spring (11)
Implementation Method 4
A magnetic force can be adjusted via a coil (21) in conjunction with an armature sleeve (23), which acts in the opposite direction to the spring force of the valve spring (11)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Adjustable damping valve for a vibration damper, comprising a housing with a stepped opening in which a valve body is axially movably guided via a guide sleeve and a radially outwardly directed shoulder, wherein the valve body has a pressurized surface effective in the downward direction of the valve body in the direction of a valve seat surface within a contact surface between the valve body and the valve seat surface, which is supplied with damping medium from an opening within a cross-section bounded by the valve seat surface, and a pressurized surface effective in the closing direction with the diameter of the guide sleeve is formed from a rear side of the valve body, wherein a resultant force comprising a force of at least one valve spring and an actuating force of an actuator acts on the valve body.and when the valve body is subjected to flow through the opening in the closing direction of the valve body, an additional surface of the valve body is pressurized with damping medium, or the valve body has a first pressurized surface AÖD1 effective in the downstroke direction, which is smaller than the pressurized surface ASchließD in the closing direction, and at least a second pressurized surface AÖD2 effective in the downstroke direction is pressurized with a reduced pressure level compared to the first pressurized surface AÖD1.