Dual Clutch Transmission Planetary Gearset Design
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Solution Overview
Problem
Existing dual clutch transmissions are bulky and heavy due to the need for multiple speed gearsets and countershafts, which increases cost and weight, while also requiring a large number of components.
Innovation Solution
A dual clutch transmission design incorporating a planetary gearset with a first and second input shaft, where the planetary gearset has an input, a first output connected to a brake and a first clutch, and a second output connected to a second clutch and a third clutch, allowing for selective coupling of the outputs and inputs to achieve eight forward and two reverse gear ratios with reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple speed gearsets and countershafts are used to provide eight forward ratios, then the gear ratios can be achieved, but the transmission becomes longer and heavier
Solution Approach 1:
The patent combines multiple speed gearsets and countershafts into a single integrated planetary gearset structure. The planetary gearset with sun gear, ring gear, and planet gears provides multiple gear ratios through different engagement configurations, eliminating the need for separate gearsets and countershafts, thereby reducing transmission length while maintaining eight forward ratios
Solution Approach 2:
The planetary gearset serves multiple functions simultaneously: it provides eight forward gear ratios, enables reverse gear operation, and allows for compact packaging. The dual clutch system with selective coupling of clutch elements achieves both speed variation and direction reversal within a single integrated structure, reducing overall transmission length
2Adaptability or versatility
If multiple speed gearsets and countershafts are used to provide eight forward ratios, then the gear ratios can be achieved, but the transmission weight increases
Solution Approach 1:
The patent merges multiple separate components (speed gearsets, countershafts, synchronizers) into a single planetary gearset system. This consolidation reduces the total amount of material required and eliminates redundant structural elements, thereby reducing transmission weight while maintaining the capability to provide eight forward ratios and reverse operation
Solution Approach 2:
The patent extracts and eliminates unnecessary components such as multiple speed gearsets, countershafts, and synchronizers from the transmission system. By removing these redundant elements and replacing them with a compact planetary gearset, the overall transmission weight is reduced while the essential function of providing multiple gear ratios is preserved
3Adaptability or versatility
If many speed gears and clutch components are used, then the transmission can provide eight forward ratios, but the device complexity increases
Solution Approach 1:
The patent combines multiple separate clutch components into a dual clutch system with selective coupling capability. The first and second clutches with their respective clutch elements are integrated to control both speed variation and direction reversal, reducing the number of separate clutch components and simplifying the overall device structure while maintaining eight forward ratios
Solution Approach 2:
The planetary gearset serves multiple functions simultaneously: it provides eight forward gear ratios, enables reverse gear operation, and allows for compact packaging. This multi-functional design reduces the number of separate components needed compared to traditional transmissions that require dedicated mechanisms for each function
Data Source
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AI summary
A transmission includes a first input shaft, a second input shaft and a planetary gearset having an input, a first output and a second output. The first output is in communication with a brake and a first clutch. The second output is in communication with the first clutch, a second clutch and a third clutch. The first clutch selectively drivingly couples the first output and the second output. The brake selectively restricts rotation of the first output. The second clutch selectively drivingly couples the second output and the second input shaft. The third clutch selectively drivingly couples the second output and the first input shaft. A first speed gearset is driven by the first input shaft and a second speed gearset is driven by the second input shaft.