Washing Machine Rotary Knob Guide Structure for Stable, Low-Noise Control
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Solution Overview
Problem
Conventional washing machine control panel assemblies experience issues with rotary knob shaking and interference with surrounding parts, leading to an unpleasant user experience and noise 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 using a boss that passes through the knob guide, which includes hooks for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the through hole size is reduced to prevent rotary knob shaking, then the shaking is minimized, but the rotary knob interferes with the decoration window and cannot rotate smoothly
Solution Approach 1:
The support structure is segmented into multiple components: a support plate with through hole, a decoration window with recessed portion, and a rotary knob. The through hole is positioned to allow the rotary knob to extend through while the recessed portion in the decoration window provides clearance, preventing interference while maintaining stability.
Solution Approach 2:
The solution moves from a two-dimensional plane (flat support plate) to three-dimensional space by creating a recessed portion in the decoration window and extending the rotary knob through the support plate. This dimensional change allows the rotary knob to rotate smoothly without interfering with the decoration window surface while maintaining positional stability through the through hole configuration.
2Ease of operation
If the rotary knob is allowed to rotate freely, then operation is smooth, but the rotary knob shakes and provides unpleasant feeling to user
Solution Approach 1:
The support plate is pre-configured with a through hole at the appropriate position and size before assembly. The decoration window is pre-formed with a recessed portion to accommodate the rotary knob extension. This preliminary preparation ensures that when the rotary knob is installed, it is automatically positioned correctly to rotate smoothly without shaking, eliminating the need for post-adjustment.
3Stability of the object's composition
If the rotary knob is constrained to prevent shaking, then stability is improved, but friction increases causing noise
Solution Approach 1:
The support plate acts as an intermediary element between the rotary knob and the decoration window. The through hole in the support plate provides a guided path for the rotary knob, allowing it to rotate smoothly with minimal friction. The decoration window's recessed portion further mediates the interaction by providing clearance, ensuring the rotary knob does not contact the decoration window surface during rotation, thus eliminating friction noise while maintaining stability.
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.