Washing Machine Knob Guide Structure for Stable Rotary Control
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Solution Overview
Problem
Conventional washing machine control panel assemblies experience shaking of the rotary knob, leading to an unpleasant user experience and interference with surrounding parts, resulting in noise and malfunction due to friction.
Innovation Solution
A control panel assembly with a knob guide and rotary knob design that includes a boss insertion part with an inclined extension to restrict the rotary knob's movement, minimizing shaking and friction by engaging hooks and varying the boss insertion hole diameter, thereby stabilizing the rotary knob and reducing contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotary knob is assembled with the rotary switch on a thin substrate, then the control panel assembly is simple in structure, but the rotary knob shakes easily providing an unpleasant feeling to the user
Solution Approach 1:
The control panel assembly is divided into separate functional components: the substrate with rotary switch, the decoration window, and the newly added knob guide. This segmentation allows each component to perform its specific function while the knob guide provides additional support to prevent shaking, resolving the contradiction between structural simplicity and stability.
Solution Approach 2:
The knob guide acts as an intermediary component between the rotary knob and the substrate. It provides additional support and stability to the rotary knob assembly without requiring a thicker substrate, thus maintaining structural simplicity while improving stability.
2Stability of the object's composition
If the through hole size is reduced to prevent shaking of the rotary knob, then the rotary knob stability improves, but the rotary knob interferes with the decoration window causing noise and malfunction
Solution Approach 1:
The knob guide serves as an intermediary structure that supports the rotary knob without requiring reduction of the through hole size. It provides the necessary stability while allowing the rotary knob to rotate freely within the through hole, preventing interference with the decoration window and eliminating friction noise.
3Ease of operation
If the rotary knob is allowed to rotate freely through a larger through hole, then the ease of operation improves, but the rotary knob shakes and interferes with surrounding parts
Solution Approach 1:
The knob guide acts as a mediator that provides lateral support to the rotary knob during rotation. This allows the rotary knob to rotate freely through a adequately sized through hole for ease of operation, while the knob guide prevents excessive movement and shaking, maintaining stability.
Solution Approach 2:
The control panel assembly uses a composite structure combining the substrate, decoration window, and knob guide made from different materials (PC, ABS, PBT) with appropriate properties. This composite approach allows each component to contribute its strengths: the substrate provides electrical functionality, the decoration window provides aesthetics, and the knob guide provides mechanical support for stable rotation.
Data Source
AI summary
Disclosed is a washing machine, a control panel assembly of which has an improved structure to minimize problems caused by a shaking of a rotary knob and the interference of the rotary knob with other surrounding parts. The control panel assembly of the washing machine includes a control panel, a knob guide installed on the control panel, and a rotary knob rotatably mounted on the knob guide and including a boss passing through the knob guide. The knob guide includes a boss insertion part restricting the boss to prevent the rotary knob from shaking. The boss insertion part includes an extension extended from the bottom surface of the knob guide and forming a boss insertion hole, into which the boss is inserted, therein.