Linear damper with axially offset friction pad
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Solution Overview
Problem
Existing washing machine dampers with closed cylindrical designs experience heat generation and wear issues during extended heavy-duty use, reducing their effectiveness and longevity, and there is a need for a reliable, long-life damper compatible with existing washing machine designs that can be molded with a minimum number of components.
Innovation Solution
A two-piece housing and piston assembly with axially offset guide channels and plungers, incorporating a coil spring and friction pads for effective damping, while allowing for heat dissipation and reduced manufacturing costs, and optionally including a motion sensor for controlling washing machine speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed cylindrical damper design is used, then the damper provides effective damping, but heat generation and wear occur during extended heavy-duty use
Solution Approach 1:
The closed cylindrical housing is segmented into an end cap and at least one guide channel with axially offset walls, creating an open architecture that allows heat dissipation while maintaining damping functionality
Solution Approach 2:
The friction pad, which generates heat through friction, is now positioned to engage with axially offset guide channel walls in an open architecture, converting the harmful heat generation into a beneficial arrangement where heat can dissipate freely while the friction damping function is preserved
2Reliability
If a closed cylindrical damper design is used, then the damper provides effective damping, but wear occurs during extended heavy-duty use
Solution Approach 1:
The housing is divided into separate components (end cap and guide channels) that can be molded independently, allowing for better wear distribution and easier replacement of worn parts
Solution Approach 2:
The friction pad acts as an intermediary between the plunger and guide channel walls, providing a replaceable wear element that protects the main housing structure from direct wear
3Reliability
If a complex multi-component damper is used, then durability is enhanced, but manufacturing cost increases
Solution Approach 1:
The end cap and guide channels are combined into a two-piece housing that can be molded as integrated polymeric members, reducing the total number of components and assembly steps while maintaining durability
Solution Approach 2:
The axially offset guide channel walls serve multiple functions: providing structural support, guiding plunger movement, and enabling heat dissipation, thereby reducing the need for additional specialized components
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 open architecture damper design reduces heat dissipation and manufacturing costs, enhances durability, and allows for precise control of washing machine operations by providing reliable damping and speed control through frictional engagement and sensor feedback.
Implementation Method 1
The plunger includes one or more friction pads which engage the wall of the guide channel of the housing to provide the desired frictional inter-engagement for the damper
Implementation Method 2
A coil spring surrounds the housing and extends between the end cap and the piston
Data Source
AI summary
A damper includes a housing with at least one axially offset longitudinally extending guide channel for receiving a plunger of a piston assembly. The plunger is axially offset from a control rod extending through the housing and the piston assembly. A coil spring surrounds the housing and extends between a hemispherical cap of the housing and the piston. The plunger includes a friction pad which engages the guide channel of the housing to provide frictional inter-engagement for the damper. In one embodiment, the housing includes a pair of axially offset guide channels and the piston assembly includes a pair of axially offset plungers which extend within a pair of guides of the housing. One of the plungers includes a linear sensor which provides signal information for use by a washer control circuit.