Washing machine and manufacturing method thereof
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Solution Overview
Problem
Existing large-capacity washing machines face manufacturing defects such as cracks or creases in the drum back, limiting their capacity and washing performance, as current reinforcement methods are inadequate and often require additional processes that complicate manufacturing.
Innovation Solution
The washing machine incorporates a drum back design with a protruding coupling portion, a recessed first forming portion, and an additional reinforcement portion, formed in a shape that includes an inclined surface and an arc cross-section, to enhance structural integrity and capacity while maintaining effective washing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the drum back is increased in size to achieve larger washing machine capacity, then the capacity is improved, but manufacturing defects such as cracks or creases occur in the drum back
Solution Approach 1:
The patent applies local quality by forming a reinforcement portion with different structural properties (protruding shape with inclined surface) at a specific location (coupling portion) of the drum back. This localized structural modification strengthens the area prone to defects without changing the overall drum back size, thereby preventing cracks and creases while maintaining large drum capacity.
2Reliability
If a reinforcement portion is added to prevent defects in the drum back, then the structural integrity is improved, but the device complexity increases
Solution Approach 1:
The patent merges the reinforcement function with the existing coupling portion structure. The reinforcement portion is formed as an integrated protruding structure at the coupling portion, combining structural support and defect prevention functions into a single unified element, thereby avoiding additional separate components and simplifying the overall drum back structure.
Solution Approach 2:
The reinforcement portion is formed during the drum back manufacturing process itself, performing the reinforcement action in advance before the drum back is installed. This preliminary structuring prevents defects from occurring during subsequent assembly and operation, eliminating the need for separate reinforcement steps.
3Volume of moving object
If the drum back is made larger to increase capacity, then the washing machine capacity is improved, but washing performance deteriorates due to reduced friction with laundry
Solution Approach 1:
The reinforcement portion creates a localized protruding structure with an inclined surface at the coupling portion, generating concentrated friction force in that specific area. This local friction enhancement compensates for the overall reduction in drum-back-laundry contact friction caused by the larger drum size, thereby maintaining effective washing performance.
Data Source
AI summary
Provided are a washing machine that can be manufactured in a large capacity without deterioration in function, and a manufacturing method thereof. A washing machine includes a drum, a drum back, and a spider. The drum back includes a coupling portion formed to protrude in a front direction of the drum at a portion of the drum back to which the spider is coupled so as to correspond to a shape of the spider, a first forming portion formed to be recessed in a back direction of the drum at a portion of the drum back to which the spider is not coupled, and a reinforcement portion formed to additionally protrude in the front direction of the drum at a portion of the coupling portion that is adjacent to the first forming portions.