Washing Machine Rotor-Shaft Locking Assembly for Faster Assembly
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Solution Overview
Problem
The existing rotor and shaft bushing combination in drum type washing machines is time-consuming to assemble and increases manufacturing costs due to the number of components involved.
Innovation Solution
A rotor design with a hollow cylinder shape and rotation groove portions on its bottom surface, featuring hooks with guide and locking ends, allows for easier assembly by using a shaft bushing with a fixed protrusion that locks into place along these grooves, reducing the number of components and assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rotor and shaft bushing are combined using the conventional method with multiple components, then the structural stability is improved, but the assembly time increases and manufacturing cost increases
Solution Approach 1:
The shaft bushing and rotor are merged into a single integrated component. The shaft bushing is formed as an integral part of the rotor body, eliminating the need for separate assembly steps and reducing the number of parts. This merging maintains structural stability while significantly reducing assembly time and manufacturing complexity.
Solution Approach 2:
The integrated shaft bushing-rotor component performs multiple functions simultaneously: it provides the rotational function of the rotor, serves as the shaft bushing for supporting the rotation shaft, and incorporates magnetic pole pieces for generating magnetic fields. This multi-functionality reduces the number of components needed while maintaining all necessary structural and functional properties.
2Stability of the object's composition
If the rotor and shaft bushing are combined using the conventional method with multiple components, then the structural stability is improved, but the manufacturing cost increases
Solution Approach 1:
The shaft bushing and rotor are merged into a single integrated component manufactured in one process. This eliminates the need for separate machining, assembly, and quality inspection of multiple parts, thereby reducing manufacturing cost while maintaining structural stability through the integrated design.
Solution Approach 2:
The integrated rotor-shaft bushing is manufactured using segmented molding or machining techniques, allowing for efficient production while maintaining the integrity of the combined structure. This segmentation in manufacturing process enables cost-effective production of the complex integrated geometry.
3Strength
If the rotor and shaft bushing are combined using the conventional method with multiple components, then the connection strength is improved, but the number of components increases
Solution Approach 1:
The shaft bushing and rotor are combined into a single monolithic component, eliminating the need for separate connection elements such as bolts, rivets, or adhesive joints. This merging maintains strong structural connection while reducing the total number of components and simplifying the overall device architecture.
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
This configuration simplifies the assembly process, reduces manufacturing costs, and ensures secure attachment of the shaft bushing to the rotor, enhancing the transfer of rotational force while maintaining optimal magnetic interaction for efficient washing machine operation.
Implementation Method 1
a permanent magnet for performing a magnetic interaction with the field winding of the stator
Implementation Method 2
an electric induction motor in which a rotational force is generated by an interaction between a rotating magnetic field generated in a stator and an inductive magnetic field generated in the rotor
Data Source
AI summary
A rotor of motor for drum type washing machine comprises a stator formed of a field winding; a rotor disposed outside the stator to house the stator, and having a yoke surface on which a permanent magnet for performing a magnetic interaction with the field winding of the stator, the rotor rotating around the stator; a shaft bushing for connecting the rotor and the rotation shaft, which is installed on the bottom surface, wherein a plurality of the rotation groove portions whose width of one side is more narrowly formed than whose width of other side are formed at regular intervals on the bottom surface of the rotor, wherein fixed protrusion which is inserted the rotation groove portions and is fixed when moved along the rotation groove portions by rotation of the shaft bushing is protruded on the bottom surface of the shaft bushing.