Washing machine driving system and a washing machine with the same
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Solution Overview
Problem
Existing washing machine driving systems face challenges in achieving a high reduction ratio while maintaining a compact size, maximizing drum volume, and ensuring efficient assembly, due to limitations in the design of planetary gear assemblies and clutch arrangements.
Innovation Solution
A washing machine driving system where the drum shaft and motor are separated, with a planetary gear assembly positioned between them, featuring a carrier shaft fixedly supported on the drum shaft, a coupling shaft serration-coupled to the carrier shaft, and a sun gear rotationally supported on the coupling shaft, allowing for a compact design and high reduction ratio without affecting the sun gear's size based on the drum shaft's diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the drum shaft passes through the carrier and sun gear shaft of the planetary gear assembly, then the structural integration is improved, but the sun gear diameter increases and the reduction ratio decreases
Solution Approach 1:
The patent divides the drum shaft into two separate components: a first shaft portion that passes through the carrier, and a second shaft portion that passes through the sun gear. This segmentation allows independent optimization of each shaft portion's function, enabling the sun gear to maintain a smaller diameter while still providing structural integration, thus preserving the high reduction ratio capability.
2Device complexity
If the planetary gear assembly and clutch assembly are arranged in series on the drum shaft axis, then the alignment is simplified, but the drum volume is reduced
Solution Approach 1:
The patent transitions from a one-dimensional series arrangement along the drum shaft axis to a two-dimensional radial arrangement. The clutch assembly is positioned radially adjacent to the planetary gear assembly rather than axially in series, which simplifies alignment while maximizing the drum volume by utilizing the radial space within the drum assembly.
3Adaptability or versatility
If the sun gear is separated from the drum shaft, then the sun gear size is no longer affected by drum shaft diameter, but additional fastening requirements are introduced
Solution Approach 1:
The drum shaft is segmented into a first shaft portion (through the carrier) and a second shaft portion (through the sun gear). The second shaft portion serves as both a structural support and a fastening mechanism, eliminating the need for separate fastening components while maintaining sun gear size independence from the drum shaft diameter.
4Power
If a high reduction ratio is achieved, then the washing mode performance is improved, but the device size increases
Solution Approach 1:
The patent implements a nested arrangement where the drum shaft passes through multiple components: the first shaft portion through the carrier, and the second shaft portion through the sun gear. This nesting allows compact packaging of the planetary gear assembly components, achieving a high reduction ratio while minimizing the overall driving system volume.
Data Source
AI summary
A planetary gear assembly includes a carrier shaft supported on a drum shaft by a first fastening member; a coupling shaft including a first shaft portion in the carrier shaft and a first flange portion fixed to the carrier shaft by a second fastening member, a carrier including a second shaft portion in the first shaft portion and a second flange portion positioned at a back side of the first flange portion of the coupling shaft, a sun gear supported on the coupling shaft and supported on a rotor frame by a third fastening member, pinion gears coupled to the second flange portion and tooth-coupled with the sun gear, a ring gear tooth-coupled with the pinion gears, and a gear housing accommodating the sun gear, the pinion gears, and the ring gear.