EV Power Transmission Layout With Selective Multi-Reducer Clutches
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Solution Overview
Problem
Existing power transmission devices in electric automobiles with planetary gear reducers face complexity and durability issues due to the need for multiple reduction ratios, leading to increased volume and reduced durability.
Innovation Solution
A power transmission device with multiple reducers and clutches that allow for variable speed reduction, including a motor, first and second reducers, clutches for connecting and disconnecting the reducers, and a differential gear for synchronized rotation, enabling multiple reduction ratios with a simplified structure and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a planetary gear reducer with multiple reduction ratios is provided, then the optimal efficiency according to traveling conditions is obtained, but the structure becomes complicated and the volume increases
Solution Approach 1:
The power transmission device is divided into multiple independent reducer units (first reducer, second reducer, etc.), each capable of providing different reduction ratios. These segmented reducers are selectively connected to the rotary shaft through clutches, allowing the system to achieve multiple reduction ratios without requiring a single complex planetary gear system. This segmentation simplifies the overall structure while maintaining adaptability.
Solution Approach 2:
The system employs clutches to dynamically connect and disconnect different reducer units from the rotary shaft based on traveling conditions. This dynamic reconfiguration allows the power transmission device to adaptively select the appropriate reduction ratio without mechanical complexity of fixed multi-ratio planetary gears, improving both structure simplicity and operational versatility.
2Adaptability or versatility
If a planetary gear reducer with multiple reduction ratios is provided, then the optimal efficiency according to traveling conditions is obtained, but the volume occupied by the reducer increases
Solution Approach 1:
Instead of one large planetary gear reducer containing multiple reduction ratios, the system uses multiple smaller, independent reducer units. Each reducer unit has a compact structure, and only the necessary unit is connected to the rotary shaft at any given time, reducing the overall volume occupied compared to a single complex multi-ratio reducer.
Solution Approach 2:
The dynamic connection mechanism through clutches allows the system to activate only the required reducer unit based on current traveling conditions, effectively reducing the volume of active components. This dynamic selection prevents the need to accommodate all reduction ratio mechanisms simultaneously in the power transmission path.
3Adaptability or versatility
If a planetary gear reducer with multiple reduction ratios is provided, then the optimal efficiency according to traveling conditions is obtained, but the durability is deteriorated
Solution Approach 1:
The power transmission system is segmented into multiple independent reducer units, each with simpler internal structures compared to a complex multi-ratio planetary gear system. This segmentation reduces the number of meshing points and potential failure locations within each reducer, thereby improving durability while maintaining the capability to provide multiple reduction ratios through selective engagement.
Solution Approach 2:
The clutch-based dynamic connection system allows the operation to be concentrated on fewer active reducer units at any time, reducing the cumulative wear and stress on the overall system. By dynamically selecting which reducer unit is engaged, the system can manage load distribution more effectively, improving the durability of individual reducer components.
Data Source
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AI summary
A power transmission device including: a motor to drive a rotary shaft; a first reducer connected to the rotary shaft to reduce rotational angular velocity of the rotary shaft; a second reducer connected to the rotary shaft to reduce rotational angular velocity of the rotary shaft; a first clutch disposed between the rotary shaft and the first reducer to connect and disconnect the rotary shaft and the first reducer; a second clutch disposed between the rotary shaft and the second reducer to connect and disconnect the rotary shaft and the second reducer; and a third clutch disposed outside the second reducer to connect and disconnect the second reducer and an external component.