Switchable Frictional Damper for Direction-Dependent Force Control
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Solution Overview
Problem
Existing frictional dampers lack the ability to variably set direction-dependent frictional forces, which limits their functionality and efficiency in applications such as washing machines, where different frictional forces are needed for pulling out and pushing in directions.
Innovation Solution
A frictional damper with a switching unit that allows for the variable setting of frictional force, using a frictional unit with at least one friction lining that generates direction-dependent friction by interacting with a tappet, and a locking mechanism to control the friction lining carrier's position, enabling stepwise adjustment of frictional force in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frictional damper uses a fixed friction lining carrier, then the structure is simple, but the frictional force cannot be adjusted for different directions
Solution Approach 1:
The friction lining carrier is designed to be movable rather than fixed, allowing it to change position based on the direction of tappet movement. This dynamic positioning enables different frictional forces for pulling-out and pushing-in directions, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The damper is divided into functional components: a movable friction lining carrier, a tappet, and a housing. The friction lining carrier can be independently positioned to achieve different frictional characteristics, allowing adjustable frictional force without requiring complete redesign of the entire structure.
2Adaptability or versatility
If the friction lining carrier is made movable to adjust frictional force, then direction-dependent friction control is achieved, but the device complexity increases
Solution Approach 1:
The movable friction lining carrier is designed to automatically position itself based on the direction of force applied to the tappet. The system self-adjusts without requiring external control mechanisms, achieving variable frictional force setting while minimizing the increase in device complexity.
Solution Approach 2:
The friction lining carrier is positioned asymmetrically within the housing, allowing different frictional forces in opposite directions. This asymmetric design enables the carrier to engage with different surfaces of the housing depending on the direction of movement, achieving direction-dependent friction control with minimal additional complexity.
3Adaptability or versatility
If a switching unit is added to variably set frictional force, then functionality is extended, but the device complexity increases
Solution Approach 1:
A switching unit is introduced as an intermediary component between the tappet and the friction lining carrier. This switching unit selectively engages or disengages the friction lining carrier based on the direction of movement, enabling variable frictional force levels without requiring complex active control systems.
Solution Approach 2:
The switching unit replaces potential electronic or hydraulic control systems with a purely mechanical solution. The switching mechanism uses mechanical interactions between the tappet, friction lining carrier, and housing to achieve variable frictional force, simplifying the control mechanism while extending functionality.
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 solution enables enhanced functionality by allowing adjustable frictional forces in both pulling-out and pushing-in directions, improving the efficiency and reliability of the damper, particularly in applications like washing machines, by ensuring consistent and controlled frictional engagement.
Implementation Method 1
a frictional unit for generating a direction-dependent frictional force on the tappet, wherein the frictional unit comprises at least one friction lining lying rubbingly against the tappet
Data Source
AI summary
A frictional damper includes a housing having a longitudinal axis, a tappet which is movable along the longitudinal axis, a frictional unit for generating a direction-dependent frictional force on the tappet, wherein the frictional unit includes at least one friction lining lying rubbingly against the tappet, and a switching unit for variably setting the frictional force.