DCT Partition-Wall Hydraulic Layout for Compact Transmission Cases
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Solution Overview
Problem
Existing dual clutch transmission (DCT) systems have a large transmission case due to the attachment of hydraulic devices for shifter displacement, which hinders compact design.
Innovation Solution
The transmission case is designed with a partition wall that separates the transmission chamber from the clutch chamber, allowing the pressure circuit block to be attached to the partition wall, thereby compacting the casing structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hydraulic device for shifter displacement is attached to the upper wall of the transmission case, then the shifter can be displaced axially to perform shift changes, but the transmission case becomes large as a whole
Solution Approach 1:
The transmission case is divided into two separate chambers by a partition wall: a transmission chamber for rotating bodies and a clutch chamber for the clutch. The pressure circuit block is attached to the partition wall, segregating the hydraulic device from the main transmission case volume. This segmentation allows the hydraulic device to be positioned efficiently without increasing the overall transmission case size.
Solution Approach 2:
Instead of attaching the hydraulic device to the upper wall (vertical dimension) of the transmission case, the pressure circuit block is attached to the partition wall (horizontal/ lateral dimension). This dimensional shift repositions the hydraulic device in a different spatial plane, optimizing space utilization and maintaining a compact transmission case configuration.
2Volume of stationary object
If the pressure circuit block is attached to the partition wall, then the transmission case becomes compact, but the pressure circuit and actuator must be precisely positioned in adjacent chambers
Solution Approach 1:
The partition wall serves as an intermediary structure that hosts the pressure circuit block. This intermediary positioning allows the pressure circuit to be integrated into the transmission case structure without requiring complex routing through the entire case. The partition wall acts as a mounting platform that simplifies the spatial relationship between the pressure circuit and the actuator in the adjacent transmission chamber.
Solution Approach 2:
The pressure circuit block is merged with the partition wall structure, combining the hydraulic device with the structural element that already divides the transmission case. This integration eliminates the need for separate mounting brackets or additional structural components, reducing overall device complexity while maintaining the compact configuration.
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
This configuration allows for a more compact transmission case by collectively arranging the pressure circuit and driven elements near the partition wall, enhancing the overall compactness of the transmission system.
Implementation Method 1
an actuator that is disposed in one of the transmission chamber and the clutch chamber and is driven by a pressure medium to be supplied
Data Source
AI summary
A transmission includes: a transmission case having a partition wall defining a transmission chamber; a clutch cover that covers the partition wall and forms a clutch chamber adjacent to the transmission chamber with the partition wall interposed therebetween; a plurality of rotating bodies accommodated in the transmission chamber; a clutch that connects and disconnects a drive source output shaft to and from at least one of the rotating bodies, the clutch being accommodated in the clutch chamber; an actuator that is disposed in one of the transmission chamber and the clutch chamber and is driven by a pressure medium to be supplied; and a pressure circuit block that constitutes at least a part of a pressure circuit for applying pressure to the actuator via the pressure medium and is attached to the partition wall.