Switching Piston Fluid Damper for Precise Speed-Dependent Braking
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Solution Overview
Problem
Existing fluid dampers for one-sided flap drives have complex designs with many components, leading to imprecise switching points, high inertia, and unstable behavior due to accumulating error tolerances and frictional forces, making them unsuitable for reliable speed control.
Innovation Solution
A simplified fluid damper design featuring a cylinder with a piston base body and a disk-shaped valve disk that moves between open and closed positions, reducing frictional interference and allowing precise control of damping force through flow resistance, with a central region of the valve disk extending radially to minimize positional dependence on friction and a guide element to prevent contact with the cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional fluid damper with a switching piston and base body is used, then speed-dependent damping is achieved, but the device complexity increases with many components
Solution Approach 1:
The patent merges the valve body and piston base into a single integrated component. The valve body is formed as an integral part of the piston base, eliminating the need for separate base bodies and reducing the number of components. This integration maintains the speed-dependent damping function while simplifying the overall structure and reducing assembly complexity.
Solution Approach 2:
The piston base is designed to serve multiple functions: it acts as both the piston base structure and the valve body that controls fluid flow. This multi-functional design eliminates the need for separate valve bodies and reduces the total component count while maintaining all necessary damping and switching functions.
2Reliability
If multiple components are assembled to achieve speed-dependent damping, then the damping function is realized, but manufacturing precision decreases due to accumulating error tolerances
Solution Approach 1:
By integrating the valve body into the piston base as a single component, the patent eliminates multiple assembly interfaces and associated tolerance accumulations. The switching point precision is improved because there are no separate valve body and base body components that would introduce cumulative manufacturing errors through assembly.
3Speed
If a traditional switching piston with multiple components is used, then speed control is achieved, but the inertia increases due to more components
Solution Approach 1:
The integration of the valve body into the piston base reduces the total mass of moving components. The single integrated component has less mass than multiple separate components, thereby reducing the piston's moment of inertia and improving switching response time while maintaining speed control capability.
4Reliability
If multiple components with frictional contacts are assembled, then the damping function is achieved, but the stability decreases due to high friction
Solution Approach 1:
By forming the valve body as an integral part of the piston base, the patent eliminates frictional contacts between separate valve body and base body components. This reduction in frictional interfaces improves the stability and reliability of the switching behavior while maintaining the speed-dependent damping function.
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
The design achieves precise and reliable switching behavior with reduced components, enabling effective braking of piston insertion speed above a defined threshold, thus protecting the system from excessive loads and ensuring safe operation.
Implementation Method 1
A flow resistance of the damping fluid in the channel determines the damping power that the fluid damper opposes the shift of the piston base
Implementation Method 2
The valve disk is moved along the lifting axis between an opening position that is at least released by the at least one channel and a closing position closed to the at least one channel
Data Source
Figure 1
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Figure 5
AI summary
The invention relates to a fluid damper (100) comprising a cylinder (110) filled with a damping fluid, a piston body (120) slidably guided in the cylinder (110) along a stroke axis (H), and a valve disc (130) spaced apart from a shell wall (113) of the cylinder (110). The piston body (120) divides an interior space of the cylinder (110) along the stroke axis (H) into a front compartment (111) and a rear compartment (112). At least one channel (121) is provided in the piston body (120) to connect the front compartment (111) with the rear compartment (112) in a fluid-conducting manner. The valve disc (130) is slidably guided along the stroke axis (H) between an open position that releases the at least one channel (121) and a closed position that closes the at least one channel (121).The valve disc (130) has a central area (131) extending radially outwards from the stroke axis (H), wherein the central area (131) is free of openings.