For beginner drivers, "old drivers" may have talked about the life of the transmission. For example, at overshoots with dual clutches, continuously variable transmissions (worst) but manual transmissions being the strongest, etc. These statements are one-sided, and their views are mainly "dry dual clutch has no durability, so the dual clutch transmission is not OK", in fact, it is "punching the face". These so-called "old drivers" think that the most reliable manual transmission (MT) also uses a dry clutch, haven't you ever thought about it? The automotive powertrain consists of an engine, clutch or torque converter, transmission (housing) and transmission section. In general, a transmission is a gear whose durability is essentially the same in addition to material and process standards. Only continuously variable transmissions that rely on friction transmission are really not durable.
The durability of the clutch depends on the driving habits and the scene of the car, and the manual transmission is the best example. If the old driver is allowed to drive the same new car, the clutch may be used for nearly 100,000 kilometers and will not slip, but the beginner driver may lose three sets of clutches after driving one or two thousand kilometers, this is because the beginner driver refuels the door semi-linkage when starting, the throttle is large, and the time for semi-linkage refueling may be very long. Semi-linkage refers to not lifting the clutch pedal completely, so that the spring reaches the friction plate (clutch plate) through the pressure plate) The more pedals are lifted, the greater the pressure, and the deeper the step, the less pressure there is. Semi-linkage can only lift part of it. Low pressure equals low friction of the friction plate, and the torque of the engine flywheel will slip when overcoming the friction. At this point, the throttle slides sharply. The training car of the training center sealed the throttle. The reason for this is to reasonably control the speed to avoid a runaway collision, but there is also the idea of reducing semi-linkage wear and extending the life of the clutch. However, beginner drivers driving their own cars have nothing to do with this, in order not to turn off, will be semi-linkage to step on the accelerator, due to the clutch wear speed and degree, the life will inevitably be shortened.
Why talk about manual transmission? Manual transmissions use dry clutches, so dual clutch transmissions are also available as dry clutch options. The so-called "dry" refers to clutches without lubrication and active cooling systems. However, the transmission using the clutch is an automatic transmission, and theoretically there is no starting semi-linkage throttle operation? - Theoretically, there must be. Because to start with a clutch, it must be semi-linked. Otherwise, the internal combustion machine will be extinguished. This DCT also has wear problems when starting out. So, is the lifespan long or short? If there is no traffic jam on the way to work, the dry clutch may also be used for 200,000 kilometers. Because it is only semi-linked when the acceleration is initiated. Conversely, if frequent clogging, the dry clutch may not be used for 20,000 kilometers. Because the dual-clutch transmission is an automatic transmission, it often shifts gears when crawling at low speeds, and there is a short semi-linkage for each shift. In order to be relatively smooth when accelerating, it will be semi-linked for a long time, and the degree of wear will become larger.
Looking at this, readers will in turn ask why manual transmissions have no problems when stuck in traffic, and dry clutches are as durable as they are? The answer is simpler. Manual driving does not go to high-frequency shifts, but the DCT of the automatic transmission changes gears at high frequencies. Finally, look at the wet clutch. The wet concept adds lubrication and heat dissipation to the clutch, reduces clutch wear with transmission oil, and absorbs and dissipates heat during the flow process. Such clutches are not afraid of frequent semi-linkage, so the best choice is a wet clutch. Even if there is no clogging, there is no reason to choose a dry dual clutch. All models originally equipped with dry dual-clutch transmissions are equipped with wet clutches at the same price point, with a clear lead in overall quality. Wet clutches typically have a lifespan of about 200,000 kilometers, and will be longer centered on a smooth road.
The service life of the torque converter is actually not higher than that of the wet double clutch, but it is certainly higher than the dry double clutch, and the design life is mostly 200,000 to 300,000 kilometers; the torque converter generally uses hydraulic transmission at a speed of less than 10 km/h. That is, there is no physical contact, a pattern of moving the turbine through the flow of oil from the transmission. At high speeds or sudden accelerations, the combined transmission of the turbine and pump wheels (active wheels) is propelled by a one-way clutch, which also wears out. The wet double clutch is like a hydraulic torque converter without hydraulic transmission function, which is equivalent to increasing the hydraulic transmission, but there is a problem of large power loss and slightly higher fuel consumption of hydraulic transmission. As a result, the current wet dual-clutch transmission still seems to be suitable for the ride model, and the AT seems to be suitable for off-road vehicles and heavy-duty tractors.