Washing machine driver
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Solution Overview
Problem
Conventional washing machine drive devices with eccentrically installed gear speed reduction mechanisms suffer from reduced efficiency and unsmooth motor operation, leading to suboptimal performance.
Innovation Solution
A drive device with a planetary gear speed reduction mechanism integrated into the motor rotor, featuring a sun-gear sleeve, planetary gear assembly, and internally toothed ring gear, ensuring coaxial power input and output, and a compact structure with multiple planetary gears to distribute load and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a gear speed reduction mechanism is eccentrically installed in the motor rotor, then the structure can be simplified, but the working efficiency is reduced and operation becomes unsmooth
Solution Approach 1:
The patent employs asymmetric design in the planetary gear mechanism where the sun gear is eccentrically positioned relative to the motor rotor axis. This intentional asymmetry allows the planetary gears to engage with both the sun gear and ring gear simultaneously, achieving speed reduction while maintaining smooth operation. The asymmetric configuration of gear teeth and carrier geometry compensates for the eccentric installation, resolving the contradiction between structural simplicity and operational smoothness.
Solution Approach 2:
The planetary gear mechanism introduces dynamic load distribution through multiple planetary gears that rotate around the eccentric sun gear. This dynamic configuration allows continuous engagement of gear teeth, ensuring smooth power transmission despite the eccentric installation. The rotating planetary gears automatically balance the eccentric forces, maintaining high working efficiency while preserving structural simplicity.
2Device complexity
If a gear speed reduction mechanism is eccentrically installed in the motor rotor, then the structure can be simplified, but the motor rotor operation becomes unsmooth
Solution Approach 1:
The planetary gear mechanism acts as a counterbalancing system where the planetary gears and carrier are designed to offset the eccentric forces generated by the sun gear's offset position. The distributed mass of multiple planetary gears creates balancing forces that counteract the unbalance, ensuring smooth motor rotor operation. This anti-weight effect resolves the contradiction between structural simplicity and operational reliability.
3Length of moving object
If a planetary gear speed reduction mechanism is built in the rotor, then the axial dimension is reduced, but the manufacturing complexity increases
Solution Approach 1:
The planetary gear mechanism is nested within the motor rotor structure, with the sun gear positioned at the center, planetary gears surrounding it, and the ring gear forming the outer boundary. This nested configuration achieves compact axial dimension by utilizing the radial space efficiently. The modular nested structure also facilitates standardized manufacturing of each component, reducing overall manufacturing complexity despite the intricate assembly.
Solution Approach 2:
The planetary gear mechanism is divided into separable modules: sun gear, planetary gears, carrier, and ring gear. Each component can be manufactured independently using standardized processes, then assembled into the rotor. This segmentation reduces manufacturing complexity by allowing specialized production of each part while achieving the compact axial dimension through precise modular integration.
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
Enhances operational efficiency and stability, reduces axial dimension, and increases the reliability of the drive device by ensuring smooth motor operation and efficient power transmission.
Implementation Method 1
a planetary gear assembly, including a planetary gear meshing with the sun-gear sleeve... an internally toothed ring gear meshing with the planetary gears
Implementation Method 2
a motor, a washing shaft, a dewatering shaft sleeve sleeved on the washing shaft, the washing shaft is coaxially installed in a rotor of the motor
Data Source
AI summary
A drive device for a washing machine includes a motor, a washing shaft, a dewatering shaft sleeve sleeved on the washing shaft, the washing shaft is coaxially installed in a rotor of the motor, and further includes a planetary gear speed reduction mechanism built in the rotor and the planetary gear speed reduction mechanism includes: a sun-gear sleeve sleeved on the washing shaft and fixedly connected to the rotor; a planetary gear assembly, including a planetary gear meshing with the sun-gear sleeve, and the planetary gear assembly is fixedly connected to the washing shaft via a planetary carrier; the number of the planetary gear is plural, and the multiple planetary gears are evenly distributed about the sun-gear sleeve; and an internally toothed ring gear meshing with the planetary gears and fixedly connected to the dewatering shaft sleeve.