Expandable-Lining Friction Damper for Washing Machine Oscillations
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Solution Overview
Problem
Friction dampers in washing machines face challenges in effectively absorbing oscillations caused by unbalances, particularly due to limitations in material properties and design, which can lead to inefficiencies in heat management and increased mechanical stress.
Innovation Solution
A friction damper design featuring a plastic housing with reinforced ribs and lamellae, a moveable tappet with a guided friction lining, and an expandable body to influence frictional behavior, along with thermally conductive materials and baffle elements to manage heat and friction, optimizing the coefficient of friction and reducing part count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the friction damper uses traditional materials and design, then it can absorb oscillations, but it generates excessive heat and increases mechanical stress
Solution Approach 1:
The patent changes the material parameters by introducing thermally conductive materials (such as metal inserts or thermally conductive polymers) into the friction damper structure. This modifies the thermal conductivity parameter of the damper, enabling more efficient heat dissipation during friction-based oscillation absorption, thereby reducing temperature buildup and associated mechanical stress
Solution Approach 2:
The patent employs composite material structures combining different materials with complementary properties - such as friction linings paired with thermally conductive supports or housing materials with optimized thermal properties. This composite approach allows the damper to simultaneously provide effective friction damping while managing heat generation through the thermally conductive components
2Adaptability or versatility
If the friction damper uses fixed friction characteristics, then it has simple design, but it cannot adapt to different operating conditions and oscillation types
Solution Approach 1:
The patent introduces dynamic adjustability to the friction damper by incorporating mechanisms that allow the friction characteristics to change during operation or be adjusted for different operating conditions. This may include adjustable friction surfaces, variable geometry components, or selectable friction elements that enable the damper to adapt its friction behavior to match different oscillation types and intensities
Solution Approach 2:
The patent designs the friction damper with multi-functional capabilities, where a single device structure can provide different friction characteristics through adjustable parameters or interchangeable components. This universal design allows the same basic damper structure to effectively handle various oscillation scenarios by modifying its friction properties without requiring entirely different damper designs for each application
3Ease of manufacture
If the friction damper uses multiple separate components, then it allows for optimized individual parts, but it increases part count and manufacturing complexity
Solution Approach 1:
The patent applies merging principles by integrating multiple functional components into unified structures. For example, the housing may incorporate thermal management features directly into its design, guide elements may be integrated with friction surfaces, and support structures may combine mechanical guidance with thermal conduction pathways. This reduction in part count simplifies manufacturing and assembly while maintaining the optimized functional characteristics of each component
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 enhances the friction damper's ability to absorb oscillations, manage heat, and reduce mechanical stress, while allowing for customizable friction characteristics and reduced material costs through a more efficient design and production method.
Implementation Method 1
a moveable tappet which is arranged in the housing parallel to the housing longitudinal axis and is led out of the housing with an end located in the housing with a moveably guided friction lining
Implementation Method 2
having a housing with thermally conducting material fractions
Data Source
AI summary
The invention relates to a friction damper (1) and method related to the preparation of a friction damper, particularly for drum washing machines having a spin gear, with a housing and with a moveable tappet (4) which is arranged in the housing (2), parallel to the housing longitudinal axis (2a), and is led out of the housing (2) and which is provided at its end located in the housing with a moveably guided friction lining (8). The invention is distinguished in that the friction lining (8) or a body carrying the friction lining (8) is provided with a receptacle (22) for receiving an expandable body (23).