Drum Washer Planetary Gear Switching for Multi-Mode Washing
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Solution Overview
Problem
Conventional drum washing machines have limitations in washing modes, leading to suboptimal washing effects and reduced service life due to high load on planetary gear mechanisms, which affects power transmission and longevity.
Innovation Solution
A drum washing machine design incorporating a planetary gear assembly that switches between two states to allow the agitator and drum to rotate in the same or opposite directions, combined with a brake system for mode control, reducing the load on the gear assembly and enhancing stability and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the planetary gear mechanism is used to drive the drum and impeller, then the washing machine can operate, but the load on the planetary gear mechanism is relatively large, affecting power transmission and service life
Solution Approach 1:
The patent extracts the direct driving function from the planetary gear mechanism by introducing a motor that directly drives the drum. This removes the heavy load of drum driving from the planetary gear mechanism, leaving it to only provide rotational direction switching and speed adjustment, thereby significantly reducing the load and improving reliability.
Solution Approach 2:
The patent introduces a motor as an intermediary device between the power source and the drum. The motor directly couples to the drum, serving as a mediator that handles the high-load driving task, while the planetary gear mechanism only performs low-load directional control, thus protecting the planetary gear from excessive load.
2Ease of operation
If the drum is directly driven by the motor through planetary gear transmission, then power is transmitted, but the structure becomes complex and control becomes difficult
Solution Approach 1:
The patent extracts the complex multi-stage planetary gear transmission structure and replaces it with direct motor-to-drum coupling. This simplifies the transmission structure significantly while maintaining the ability to control drum rotation, thereby improving ease of operation and reducing structural complexity.
Solution Approach 2:
Instead of using the planetary gear mechanism to transmit power from motor to drum (conventional approach), the patent inverts the approach by having the motor directly drive the drum and using the planetary gear mechanism only for directional switching. This inversion simplifies the overall control structure.
3Productivity
If a single washing mode is used, then the structure is simple, but the washing effect is affected and washing time cannot satisfy quick washing requirements
Solution Approach 1:
The patent introduces dynamic control capabilities by enabling the planetary gear mechanism to switch between different operational states (different rotational directions and speed ratios). This allows the washing machine to adapt between different washing modes (standard wash and quick wash) based on needs, improving productivity without excessive structural complexity.
Solution Approach 2:
The patent changes operational parameters (rotational direction, speed ratio) of the planetary gear mechanism to achieve different washing modes. By adjusting these parameters, the system can switch between standard washing and quick washing modes, thereby improving productivity while maintaining relatively simple structure.
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
Enables various washing modes, improves washing efficiency, extends the service life of the machine by reducing the load on the planetary gear assembly, and simplifies control mechanisms, resulting in stable and effective operation.
Implementation Method 1
the brake pawl holds the brake disk tightly to brake the brake disk
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A drum washing machine (100) includes a tub (1); a drum (2) rotatably provided in the tub (1); an agitator (4) rotatably provided in the drum (2) and having a water spray hole; a driver in transmission connection with the drum (2) via a main shaft (31), and the main shaft (31) transmitting a torque of the driver to the drum (2); a planetary gear assembly (6) in transmission connection with the main shaft (31) and the agitator (4) respectively, and transmitting the torque of the main shaft (31) to the agitator (4); a brake (7) linked with the planetary gear assembly (6);and a water supply device configured to supply water to the agitator (4).