Switching Piston Fluid Damper for Precise Low-Friction Damping
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Solution Overview
Problem
Existing gas springs in single-sided flap drives and automatic tailgates have complex designs with many components, leading to imprecise switching points, unstable switching behavior, and high frictional forces, which result in detrimental permanent damping forces during normal operation.
Innovation Solution
A fluid damper with a simplified design featuring a cylinder, a piston base body, and a valve disk spaced apart from the cylinder shell wall, allowing for precise switching behavior without frictional influences. The valve disk shifts between an opening and closing position based on pressure differences, effectively controlling the damping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas spring with speed-dependent damping force is used, then compression damping is provided for excessive speeds, but the design becomes complex with many components leading to imprecise switching points and unstable switching behavior
Solution Approach 1:
The switching piston is divided into functionally independent components: a base body with sealing elements and a separate valve body with throttling holes. This segmentation allows each component to be optimized independently, reducing the accumulation of tolerance errors and improving switching precision while maintaining manageable complexity.
Solution Approach 2:
The valve body is extracted as a separate shiftable component from the base body, allowing it to move independently to control the throttling holes. This extraction enables precise control of the damping force activation while simplifying the overall design by separating the sealing function (base body) from the flow control function (valve body).
2Force
If multiple components are involved in the switching mechanism, then damping force control is achieved, but frictional forces increase leading to detrimental permanent damping forces during normal operation
Solution Approach 1:
The valve body is extracted as a separate shiftable component that moves within the base body's guide sleeve. This design minimizes contact surfaces and friction by allowing the valve body to shift freely on the sealed base body, reducing permanent damping forces during normal operation while maintaining effective damping force control when needed.
Solution Approach 2:
The base body provides localized sealing at specific positions (first and second sealing positions) while the valve body provides localized flow control through throttling holes. This local quality approach ensures that friction is minimized to only where necessary for sealing and flow control, reducing overall energy loss.
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 fluid damper achieves precise control over damping forces, preventing excessive speeds and ensuring reliable operation by maintaining low resistances and minimizing disturbances, thus enhancing safety and reducing the risk of damage.
Implementation Method 1
The valve disk shifts between an opening and closing position based on pressure differences
Implementation Method 2
a fluid damper with a simplified design featuring a cylinder, a piston base body, and a valve disk spaced apart from the cylinder shell wall, allowing for precise switching behavior without frictional influences
Data Source
AI summary
A fluid damper is provided including a cylinder filled with a damping fluid, a piston base body shiftably guided in the cylinder along a stroke axis, and a valve disk spaced apart from a shell wall of the cylinder. The piston base body divides an inner space of the cylinder into a front space and a rear space along the stroke axis. In the piston base body, there is at least one channel connecting the front space to the rear space in a fluid-conducting manner. The valve disk is shiftably guided along the stroke axis between an opening position unblocking the at least one channel and a closing position closing the at least one channel. The valve disk has a central area extending radially outward from the stroke axis, the central area being free of apertures.