Dual-Clutch Transmission Layout for Better Installation Space
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Solution Overview
Problem
Dual clutch transmissions face limitations in installation space due to the conventional arrangement of clutches, which restricts the placement of other transmission elements and efficiency.
Innovation Solution
The first clutch is connected to both transmission input shafts, allowing the second clutch to be arranged spatially apart, creating space for other elements, such as between gear set planes or at the end of the hollow transmission input shaft, and optionally incorporating a third clutch for decoupling the internal combustion engine during electric operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the second clutch is arranged close to the first clutch in conventional dual clutch transmissions, then the transmission structure is compact, but space for other transmission elements is limited
Solution Approach 1:
The dual clutch transmission is segmented into two spatially separated clutch units: the first clutch (K1) positioned in the clutch bell housing and the second clutch (K2) positioned in the gear set housing. This segmentation allows each clutch to be independently arranged in optimal locations, resolving the contradiction between compactness and arrangement flexibility by distributing components across different spatial zones rather than concentrating them together.
2Area of stationary object
If the second clutch is arranged between gear set planes, then space is created in the clutch bell housing area, but the clutch actuation mechanism becomes more complex
Solution Approach 1:
A connecting shaft (24) serves as an intermediary element that transmits rotational motion from the first clutch (K1) to the second clutch (K2) across the spatial gap between the clutch bell housing and gear set housing. This intermediary mechanism enables the second clutch to be positioned remotely between gear set planes while maintaining functional connectivity, resolving the contradiction by providing a straightforward mechanical coupling rather than complex actuation systems.
3Volume of moving object
If the second clutch is arranged at the end of the hollow transmission input shaft, then space utilization is improved, but the shaft design becomes more complex
Solution Approach 1:
The hollow transmission input shaft (30) performs multiple functions: it serves as the primary input shaft for the second sub-transmission, provides a hollow passage for the connecting shaft to pass through, and supports the mounting of the second clutch (K2) at its end. This multi-functionality resolves the contradiction by making the shaft structure serve several purposes simultaneously, thereby improving space utilization without proportionally increasing complexity.
Data Source
AI summary
A dual clutch transmission arrangement (4) includes a first clutch (K1) and a second clutch (K2) for connecting a drive unit (2) to a first sub-transmission and to a second sub-transmission. The first clutch (K1) is connected to both transmission input shafts. A motor vehicle with the dual clutch transmission arrangement (4) is also provided.