Multi-Planetary Transmission Coupling for Nine Forward Ratios
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Solution Overview
Problem
Current multi-speed transmissions face challenges in achieving a sufficient number of forward and reverse speed ratios using existing configurations of planetary gearsets and selective couplers, limiting their versatility and efficiency.
Innovation Solution
The use of multiple planetary gearsets and selective couplers, including clutches and brakes, is implemented to achieve at least nine forward speed ratios and one reverse speed ratio by varying the interconnections and engagement configurations of these components, allowing for flexible torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing configurations of planetary gearsets and selective couplers are used, then the transmission structure is relatively simple, but the number of forward and reverse speed ratios is insufficient
Solution Approach 1:
The transmission system is divided into multiple independent planetary gearsets (first, second, third, and fourth planetary gearsets) that can be selectively engaged. Each planetary gearset can provide different speed ratios, and by segmenting the transmission into these modular units connected through selective couplers, the system achieves a greater number of forward and reverse speed ratios without requiring a single complex geartrain
Solution Approach 2:
Multiple planetary gearsets are arranged in a nested or串联 configuration where the output of one planetary gearset feeds into the next through interconnectors and selective couplers. This nesting allows the transmission to achieve compound speed ratios by combining the effects of multiple planetary stages, thereby increasing the total number of available ratios while maintaining a relatively organized and manageable structure
2Adaptability or versatility
If multiple planetary gearsets and selective couplers are added to increase speed ratios, then the versatility and efficiency are improved, but the device complexity increases
Solution Approach 1:
The selective couplers and interconnectors are designed to serve multiple functions: they can connect different planetary gearsets in various configurations, engage different combinations of sun gears, planet carriers, and ring gears, and provide both forward and reverse speed ratios. This multi-functionality allows the same set of components to achieve versatility and efficiency improvements without proportionally increasing device complexity
Solution Approach 2:
The transmission system employs dynamically engageable selective couplers that can selectively connect or disconnect different planetary gearsets and their components based on the desired speed ratio. This dynamic configuration capability allows the system to adapt its internal connections in real-time, providing versatility and efficiency improvements while maintaining a manageable structural complexity through controlled engagement rather than permanent complex linkages
Data Source
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AI summary
A multi-speed transmission (300) including a plurality of planetary gearsets (308, 310, 312, 314) and a plurality of selective couplers (362, 364, 366, 368, 370, 372) is disclosed. The plurality of planetary gearsets includes a first planetary gearset (308), a second planetary gearset (310), a third planetary gearset (312), and a fourth planetary gearset (314). The plurality of selective couplers includes six selective couplers (362, 364, 366, 368, 370, 372). The six selective couplers (362, 364, 366, 368, 370, 372) may include four clutches (366, 368, 370, 372) and two brakes (362, 364).