Is wet or dry dual clutch better?

Wet dual-clutch is better than dry clutch and ** is also higher.

Wet dual clutch refers to a multi-plate clutch with two sets of clutches, one large and one small, coaxially assembled. They are assembled in a sealed oil chamber filled with hydraulic oil. As a result, the wet clutch structure has better modulation capacity and excellent hot melt performance, and can transmit more torque without damage.

However, due to the factors of layout and friction materials, the overall size of the wet dual clutch is larger than that of the dry dual clutch, which is not conducive to the layout of the vehicle powertrain.

7-speed dry dual-clutch transmission. The wet dual-clutch variable box must have a hydraulic pump, lubricating fluid, cooling pipe and external cooling system, and the dry dual-clutch will have more advantages in terms of manufacturing cost, lightweight, and space structure optimization due to the saving of the relevant hydraulic system, in addition, because the dry dual-clutch has no hydraulic resistance, the transmission efficiency will be relatively high, and the fuel economy will be superior to the wet one.

7-speed dry dual-clutch precautions.

Generally, in the process of driving, if you encounter a relatively congested road section, it is best to switch to manual mode, which can effectively avoid wear and tear caused by frequent gear changes of the transmission. If you encounter a long red light, you can switch neutral, pull the handbrake and release the brake to keep the transmission at rest.

If you want to start with a dual-clutch transmission, be sure to be gentle, because the first gear is just a transition gear, so don't put too much load on the first gear. In general, the dual-clutch transmission has the unique advantages of fast shifting speed, sensitive response, high transmission efficiency and good fuel-saving effect.

Dry dual-clutch and wet dual-clutch have similarities and differences, of course, it does not mean that who is better than the other, each has its own advantages and disadvantages. The difference between a dry dual clutch and a wet dual clutch is that the two have different clutch plates working environment. Wet dual clutch plates are clutch plates that are immersed in transmission fluid, while dry dual clutch plates are in direct contact with the engine flywheel.

From the perspective of technical maturity and reliability, the wet dual clutch is more stable to use because the clutch plate works in the hydraulic oil, and the oil plays a certain role in heat dissipation.

Because of poor heat dissipation, dry dual clutch is prone to the risk of high temperature or even ablation of clutch plates in congested urban areas. At this level, the wet dual-clutch transmission technology is more mature. At the same time, the wet dual-clutch structure is complex, the manufacturing cost is high, and its power transmission efficiency is not as high as that of the dry type.

Clutch control.

In the process of engaging the dry clutch, it is necessary to control the clutch not only to ensure that the wear of the joint surface is minimized, but also to make the transmission system have good performance. To achieve these goals, the appropriate positive clutch pressure must be applied. The optimal bonding law obtained by applying the parameter optimization method belongs to the category of static optimization design.

The optimal engagement law, calculated using the principle of minima, only takes into account the engagement law from the start of the clutch disc to the full engagement, not the entire starting engagement process. Although the whole starting process is taken into account, the assumption that the engine torque during the starting process is a fixed constant is obviously inconsistent with the actual situation and the calculation is complicated.

Wet dual clutch: refers to the dual clutch is a large and a small two groups of multi-plate clutches coaxially installed together, they are installed in a closed oil cavity filled with hydraulic oil, so the wet clutch structure has better adjustment ability and excellent hot melting, it can transmit relatively large torque.

To talk about the advantages: the wet dual-clutch is stable and mature, not only can achieve fast and smooth, seamless shifting, but also at low speeds because of the oil to help dissipate heat, so there will be no overheating.

Disadvantages: Naturally, it is also because the wet dual-clutch structure is complex, the volume and weight are relatively large, the manufacturing cost is much higher than that of the dry dual-clutch, and the maintenance is relatively time-consuming and laborious, and it is necessary to replace the liquid regularly.

For high-end cars, it doesn't matter how much money you have, but for many civilian models, it is the most sensitive range, and you should pay more attention to the cost.

Dry dual clutch: refers to the transmission of torque through the friction plate on the clutch disc disc, due to the saving of the relevant hydraulic system, and the dry clutch itself has the high efficiency of transmitting torque. However, the wet clutch uses more energy than the dry type when shifting gears, so the dry system greatly improves fuel economy.

At the same time, a dry dual-clutch transmission is lighter than a wet dual-clutch transmission. This is because the wet dual-clutch variable box must have a hydraulic pump, lubricating fluid, cooling pipes and an external cooling system, while the dry type does not need these accessories. This, of course, is one of the selling points of the 7-speed DSG dual-clutch transmission.

If there is a disadvantage: the dry dual-clutch has a relatively inferior heat dissipation capacity and can withstand a lower torque.

However, for the civilian models it is used in, because the manufacturing cost is low, the cost of future maintenance is also low.

At the same time, this kind of model is not a performance tendency, and the power of the engine is not particularly strong and can not be controlled, so the application of dry dual-clutch can not only bring better driving pleasure, but also save a lot of money in daily use, maintenance, repair, and car purchase costs.

Everyone wants to save a few dollars and honor their parents; Buy a few beautiful clothes and bags for your wife and girlfriend to create some romance; Buy your child a favorite toy and let him learn more. As for the car, let's buy a means of transportation, take my wife and children out on the weekend, and buy it not to open it, so how can it be so easy to break?

Hello dear!! Dual-clutch transmission can be mainly divided into dry dual-clutch and wet dual-clutch two, although the name is different, but their working principle is roughly the same, are by the two clutches take turns to switch gears, but the medium transmitted between the driving disc and the driven disc is different, the dry dual-clutch transmission uses air transmission, and the wet dual-clutch transmission uses oil.

Hello dear!! 1. Transmission efficiency.

The dry dual-clutch is transmitted through the direct contact of the metal sheet, the power transmission is more direct, the metal sheet is compressed, the transmission ratio is increased, and the transmission effect is remarkable; The wet dual-clutch is soaked in oil, which will increase the resistance of the transmission, so the transmission efficiency is not as good as the dry dual-clutch.

2. Lightweight and manufacturing costs.

The wet dual-clutch variable box must have a hydraulic pump, lubricating fluid, cooling pipe and external cooling system, while the dry dual-clutch will have more advantages in terms of manufacturing cost and lightweight due to the saving of the relevant hydraulic system.

3. Heat dissipation.

Since the dry dual clutch is air heat dissipation, it can only be dissipated by air cooling, while the wet dual clutch is soaked in oil, that is, water cooling, which is obviously higher than the heat dissipation efficiency of dry type, which is why dry dual clutch is easy to fail.

4. Withstand torque.

The metal friction plate of the dry clutch is not lubricated with oil like the wet type, if it receives too much stress impact, it is easy to cause damage to the friction plate, therefore, the dry clutch can only be used for small displacement and low torque output models, and even, in order to adapt to the dry clutch, some models deliberately output the torque of the engine in low gear, in order to protect the transmission clutch. I hope my answer will help you and I wish you a happy life!!

Wet dual-clutch is better than dry dual-clutch.

The clutch plate of wet double clutch is soaked in a sealed oil environment, and the heat generated when the clutch plate is working is taken away by the oil to ensure the working stability of the clutch; The dry dual-clutch can only dissipate heat by exchanging heat between the air and the outside air.

The wet dual-clutch has lubricating fluid during transmission, which can greatly reduce the wear degree of the friction plates, so that the friction plates are in the mixed friction stage. Therefore, the wet dual-clutch is more durable than the dry dual-clutch and has a longer lifespan. According to relevant studies, the life of the wet dual-clutch system is 5-6 times that of the dry dual-clutch system.

It can be seen that the wet dual-clutch is better in terms of durability and fuel consumption.

Introduction to wet dual-clutch transmission

The meaning of the wet dual-clutch is the clutch old liquid plate, the dual-clutch gearbox that is directly immersed in the transmission oil. At present, there are two main types of dual-clutch transmissions, one is wet and the other is dry. If it is a dry clutch gearbox, that is, it means that the clutch plates are not soaked in the transmission oil.

Dual-clutch transmissions are common automatic transmissions that are developed on the basis of manual transmissions. The structure of a dual-clutch transmission is similar to that of a manual transmission. This gearbox just has one more set of clutch plates and a set of shift control mechanism than the manual transmission.

The dual-clutch gearbox has one set of clutch plates to control the odd number of gears and the other set of clutch plates to control even gears. The dual-clutch gearbox has a fast shift speed and high transmission efficiency.

This transmission is connected to the engine by clutch plates, just like a manual transmission. The dual-clutch transmission gives the driver a clean driving experience. Both performance cars and supercars will use dual-clutch transmissions, and fast shifting speed and high transmission efficiency are the most needed for performance cars.

Compared to dry dual-clutch transmissions, wet dual-clutch transmissions have better heat dissipation, better reliability and stability, and are capable of withstanding more torque.

Wet dual-clutch and dry dual-clutch have their own advantages and disadvantages.

1. Transmission efficiency

The dry dual-clutch is driven by the direct contact of the metal sheet, the power transmission is more direct, the metal sheet is pressurized, the transmission ratio is increased, and the transmission effect is remarkable. However, the wet dual-clutch soaking in oil will increase the transmission resistance, so the transmission efficiency is not as good as the dry dual-clutch.

2. Light weight and low manufacturing cost

The wet dual-clutch gearbox must have a hydraulic pump, lubricating fluid, cooling pipe and external cooling system, while the dry dual-clutch will have more advantages in terms of manufacturing cost and light weight because of the saving of the relevant hydraulic system.

3. Heat dissipation

Because the dry dual clutch is air-cooled, it can only be cooled by empty brother burning gas, while the wet dual clutch is immersed in oil, that is, water cooled, which is obviously more efficient than the dry dual clutch, which is also the reason why the dry dual clutch is prone to failure.

4. Withstand torque.

The metal friction plates of a dry clutch are not oil-lubricated like a wet clutch. If it is subjected to excessive stress impact, it can easily cause damage to the friction plate. As a result, dry clutches can only be used in vehicles with small displacements and low torque outputs.

Even, in order to adapt to the dry clutch, some vehicles deliberately output the torque of the engine in a low gear to protect the transmission clutch.

Advantages and disadvantages of dual-clutch gearbox:

Advantages: 1. The dual-clutch gearbox combines the advantages of manual transmission and automatic transmission, without using torque converters, and instead adopts two sets of clutches, and through the alternating work of the two sets of clutches, the effect of backlash-free gear shift is achieved.

2. Because there is no torque converter, the power of the engine can be fully exerted, and the two sets of clutches work alternately with each other, so that the shift time is extremely short, and the power fault of the engine is very limited.

3. Because the shift is more direct and the power loss is smaller, its fuel consumption can be reduced by more than 10.

Disadvantages: 1. Because the hydraulic torque converter is not used, and the "semi-linkage" action of the manual transmission cannot be realized, the insufficient torque at low speed will be completely exposed for the small displacement engine.

2. Because the dual-clutch adopts computer control, it belongs to an intelligent transmission, it needs to send an electronic signal to the engine in the process of upshifting and downshifting, and after the engine replies, it can cooperate with the engine to complete the upshift and downshift. The use of a large number of electronic components also increases the probability of failure.

The AT gearbox is commonly known as a mechanical gearbox, although it does not give the car the feeling of a small horse-drawn cart.

The technology of the AT gearbox has also become very mature. Of course, the disadvantages of the AT gearbox are also obvious, that is, the structure is complex and the manufacturing difficulty is high, resulting in a high failure rate of this gearbox, and the AT gearbox will produce obvious frustration when changing gears.

Wet dual-clutch gearbox solves the problem of dry dual-clutch transmission cooling, but does not solve the low-speed driving frustration, AT: transmission technology is mature and reliable, wet dual-clutch gearbox smooth shift is its biggest advantage, its structure is similar to two AMT gearboxes put together, it can be said that in terms of shifting, wet dual-clutch can do seamless shifting, and its shift efficiency is almost comparable to CVT continuously variable gearbox. The structure of the wet dual-clutch gearbox is relatively simple, so it is not expensive, and it is the choice of many domestic cars.

Of course, there are advantages and disadvantages. First of all, because most of the wet dual-clutch is now required to match the engine, although this will not make the car feel like a small horse-drawn cart, but because the wet clutch can not produce enough friction in the face of the torque of the small displacement engine, and the clutch takes away the heat too quickly when working, it also leads to the instability of the wet dual-clutch.