What is the "double" of the double clutch?
At the beginning of the article, we are neither boastful nor ignorant. Let's see what dual clutch is.
The Powershift patent actually existed before World War II. 1939, Adolphe Kegresse, a Frenchman, obtained the world's first powershift patent, and hoped to apply it to Citroen traction Avant, but it failed to be realized due to business environment and other reasons.
Dual clutch gearbox is a combination of two manual gearboxes, with an automatic gear shifting mechanism, which is essentially a manual gearbox, except that the computer controls the clutch for you. It has the advantages of manual gearbox: high transmission efficiency, fuel saving and fast shift speed; It also has the advantages of automatic gearbox and simple operation.
Just like a relay race. The catcher began to start slowly before the previous runner arrived. This is why all kinds of manufacturers will declare "fast gear shifting and seamless power connection" when promoting.
Classification of double clutches
Looks like the dual clutch gearbox is perfect, doesn't it? How to get to 3. 15? Here we should start with the classification of dual clutch.
Double clutch is divided into dry type and wet type. The dry dual clutch is in direct contact with air, and the cooling is basically completed by airflow. When encountering traffic jam, the clutch is always in a semi-linkage state, and the shift logic of dual clutch is easy to cause the clutch to wear and overheat, thus causing problems such as frustration and inability to shift gears. In addition, problems such as "gear display jumping and flashing wildly", "sudden speed increase during driving", "gear shift interruption" and "obvious frustration in gear shift" are also common.
In wet power shift, the clutch is oil-soaked, which can solve the overheating phenomenon well by cooling and lubricating with oil, and can bear more torque than dry dual clutch, but the cost is higher than dry dual clutch, which is mostly reflected in high-end models.
Double clutch manufacturer
After several years of development, the failure rate of dual clutch has been reduced, but the level of different brands and grades of cars is not the same.
There are also high-end products such as ZF, Gracci Yano, Getrag and Ricardo. Most of these gearboxes provide dual-clutch gearboxes for high-end sports cars, which have high research and development costs and high performance. Obviously, it is impossible to use them in civilian vehicles.
We often come into contact with Borgwarner and Luke's gearboxes, and their products are mostly used in American and German low-end models.
Can I buy a dual clutch
If you are going to buy a supercar, the disadvantages of dual clutch can be completely ignored, because these powershift are really "smashed" with money, and the research and development expenses are almost enough to buy a compact car.
If you are just an ordinary citizen and want a worry-free car, it is still recommended to avoid double clutch as much as possible. If the car you've always wanted happens to be equipped with a dual clutch, it's not completely impossible to buy. The problem of dry dual clutch is not obvious for small cars and low torque models, so you can consider buying it; However, if it is a compact or even mid-level car, then you must not choose a dry dual-clutch model. Once there is traffic jam, the failure rate of dry dual clutch will increase a lot. In contrast, wet dual clutch is safer and has lower failure rate.
There is nothing wrong with the dual clutch itself, but the complex driving environment makes the shift logic of the computer far less than that of the human brain, but many people can't let go of the high efficiency and fuel economy of the dual clutch, which really makes people love and hate. If you buy a car now, will you consider dual clutch?