Friction Damper Directional Damping Mechanism
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Solution Overview
Problem
Friction dampers lack directional control over damping effect, leading to inadequate opening movement assistance and excessive slamming during flap closure, causing noise and potential damage.
Innovation Solution
A friction damper design with a displacement mechanism for the friction lining carrier between extended and pushed-in positions, generating different frictional forces based on direction, utilizing a tappet and housing configuration that allows for passive operation without additional activation, ensuring robust and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a friction damper uses constant friction force in both directions, then the structure is simple, but the damping effect cannot prevent slamming during closure while impeding opening movement
Solution Approach 1:
The friction lining carrier is made displaceable between extended and inserted positions, allowing the friction force to dynamically change based on actuation direction. During opening, the carrier is in extended position with lower friction; during closing, it shifts to inserted position with higher friction to prevent slamming.
Solution Approach 2:
The friction damping function is segmented into two distinct states: extended position for opening movement with reduced friction, and inserted position for closing movement with increased friction. This segmentation allows optimized performance for each direction of actuation.
2Adaptability or versatility
If the friction lining carrier is made displaceable between extended and inserted positions, then direction-dependent damping is achieved, but the device complexity increases
Solution Approach 1:
The friction lining carrier automatically displaces itself based on the actuation direction without requiring external actuators or complex control mechanisms. The displacement is driven by the operational forces during opening and closing, making the system self-regulating and reducing overall device complexity.
Solution Approach 2:
The displacement mechanism of the friction lining carrier is integrated with the existing damper structure and actuation sequence. The carrier's movement is coupled with the plunger's motion, merging the directional control function into the existing mechanical framework without adding separate control systems.
3Manufacturing precision
If additional actuators are used to actively displace the friction lining carrier, then precise control of friction force is achieved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The friction lining carrier is passively displaced by the operational forces during damper actuation, eliminating the need for separate actuators, motors, or control systems. This passive self-displacement approach significantly reduces manufacturing costs while maintaining adequate friction force control for directional damping.
Solution Approach 2:
The complex active control system with additional actuators is extracted and removed from the design. Instead, a simplified passive displacement mechanism is used that leverages the existing operational forces, reducing manufacturing complexity and cost while retaining the essential directional 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 direction-dependent damping, ensuring smooth opening and preventing accidental slamming by automatically adjusting frictional forces based on actuation direction, maintaining robust and constant friction conditions.
Implementation Method 1
A frictional force is generated between the plunger and the friction unit by the frictional contact of the friction lining against the plunger
Data Source
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AI summary
A friction damper (1) comprises a housing (2) having a longitudinal axis (3), a plunger (4) displaceable along the longitudinal axis (3), a friction unit (24) for generating a frictional force on the plunger (4), wherein the friction unit (24) comprises at least one friction lining (25) for frictional contact with the plunger (4), a friction lining carrier (26) on which the at least one friction lining (25) is held, wherein the friction lining carrier (26) is displaceably arranged relative to the plunger (4) in the housing (2) between an extension position and an insertion position, and wherein in the extension position an extension friction acts which is different from the insertion friction acting in the insertion position.