[YesAuto Gearbox Technology] When it comes to dual-clutch gearboxes, it seems that it is a never-ending debate. Some people like it because it shifts quickly and saves fuel. Some people hate it because it is difficult to solve. The contradiction of love and hate is also true, and naturally some people are willing to continue to solve it and polish it.
With the launch of the 2021 SAIC Roewe RX5 PLUS, the new 7-speed wet dual-clutch gearbox was unveiled. What is so special about this new box? How does it solve the “dry pain points”? Go!
Do you want to know what the testing process of a car is like? Do you want to know how the car home judges the advantages and disadvantages of a car? Scan the QR code in the picture below , and we will be waiting for you at the Beijing Kaize Motor Sports Center on June 27. After signing up, you can complete the test with the professional test editors and professional drivers of the car home. There is also an elk test and a track. Test, AEB test and other items can be experienced. (This event will be held in Beijing, and friends from other cities will consider as appropriate)
Roewe RX5 2021 PLUS 330TGI Automatic Guochao Zhizun Edition
The dry type is the slag wet type, is it kind? It's a bit arbitrary! This topic will be debated countless times every day, for example: CVT gearbox with a small displacement self-priming engine, it must be a good choice for transportation and shopping. The dual-clutch gearbox, which features fast shifting, high transmission efficiency, and low fuel consumption, has been adapted and accepted by the public in the past ten years.
Even so, the congested urban road conditions are still the nightmare of dual-clutch gearboxes. In this case, the dual-clutch gearbox will make it more difficult to judge the driver’s intention. Loosen the oil, and the second gear has moved back again. The first gear is often used in drag gear. If it creeps for a long time, it is easy to cause the dual-clutch gearbox to overheat. Such scenes often appear in the morning and evening peaks under urban road conditions. In the final analysis, the biggest natural enemy of the dry dual-clutch that relies on natural wind to dissipate heat is still: congestion!
Briefly introduce the background of this 7-speed wet dual-clutch gearbox, model: DM21, it and the dry dual-clutch gearbox used by Roewe's previous generation models are both self-developed by SAIC.
The three-chamber independent design of the hydraulic control module, gearbox, and clutch is the first structure. The DL382 gearbox used in the familiar Audi car series is a “two-chamber” design, including the more familiar 7GDCT and Volkswagen used by Mercedes-Benz. The family's DL381, Magna DCT300, etc. are the most common “single cavity” designs. And this gearbox also uses a high-pressure actuator system, the torque transmission can be more precise, the torque resolution is 10 N·m (the torque connection brought by each shift will be smaller)
The popularity of L2 assisted driving system: can the wet dual clutch continue to take over?
SAIC Roewe's wet dual-clutch transmission not only fundamentally solves the inherent disadvantage of dry dual-clutch transmission in terms of heat dissipation. From the independent oil cavity design to the follow-up of the peripheral supporting systems, I have seen a lot of action. These details reveal a message: SAIC also has high hopes for this gearbox.
Even so, the compact visit process left me with some regrets, such as the impact of the three-cavity independence on the cost of after-sales oil changes? We can only find the answer from the subsequent maintenance interpretation. And with the popularization of adaptive cruise and L2 assisted driving systems, there is reason to believe that the dual-clutch gearbox will face no small challenges in terms of shift frustration and shift logic in the future. At that time, the dual-clutch gearbox we are familiar with, can it continue to surprise us? I think I can look forward to it.