Hello, CVT gearbox has a history of 100 years. Nissan has been committed to promoting the upgrade of CVT since 1992. Dongfeng Nissan has mastered the core technology and the quality is trustworthy. Next, we will take you through the history of CVT technology and understand the "past life" of Nissan CVT. 1992, Nissan has developed a new one.

Why are there many problems with Nissan cvt gearbox?

Hello, CVT gearbox has a history of 100 years. Nissan has been committed to promoting the upgrade of CVT since 1992. Dongfeng Nissan has mastered the core technology and the quality is trustworthy.

Next, we will take you through the history of CVT technology and understand the "past life" of Nissan CVT.

1992, Nissan developed a new generation CVT gearbox, named "N-CVT" (using electromagnetic clutch), which is a small CVT with small torque. At that time, it was mainly used in some small-displacement cars, such as Marci.

By 1997, Nissan has developed a CVT gearbox that can withstand large torque and named it "Hyper CVT". Hesitant to use innovative high-rigidity materials to convey steel belts, and the maximum torque is greatly improved. This Hyper CVT can be installed in a 2.0L displacement car, which was a breakthrough in the industry at that time.

In 2000, Nissan pioneered the roller CVT, named "EXTROID-CVT", which uses rollers to transmit power and can withstand greater torque. Perhaps because of the cost, EXTROID-CVT has not been widely used.

After 2002, it can be said that Nissan CVT gearbox has entered a stage of rapid development. Since then, CVT gearboxes have been widely used in its models. Through the application of "thrust" high-strength steel belt technology, CVT gearbox (called "XTRONIC-CVT") can be mounted on medium and large displacement vehicles, and Nissan CVT has also entered the "XTRONIC-CVT" era.

In 2009, Nissan pioneered CVT with auxiliary gearbox (code name CVT7), which can realize a wide transmission ratio of 7.3, while realizing lightweight and miniaturization design. Later, it was mainly used for vehicles with displacement less than 1.6L, and now it basically replaces the small CVT gearbox of the previous generation, which is mainly used for Sunshine, Sunway, Trent and other vehicles.

In terms of domestic Nissan, a new generation XTRONIC-CVT (code name CVT8) has been introduced, which has excellent fuel economy and driving comfort, and is mainly used for medium and large displacement vehicles. At present, this is the CVT gearbox used by the new generation of Teana. It is understood that this gearbox will replace CVT2 and CVT3 in the future and be installed on 2.5L-3.5L models.

Throughout the development history of Nissan CVT gearbox, the first stage is basically to continuously improve the torque transmitted by CVT gearbox, and the second stage pays more attention to improving CVT transmission efficiency and transmission ratio range in order to obtain better fuel economy and driving performance.

Advantages of continuously variable transmission:

economical and practical

CVT can realize a wide range of stepless speed change, so as to obtain the best matching between transmission system and engine working conditions and improve the fuel economy of the whole vehicle.

2. Mechanics

The reserve power of the car determines the climbing ability and acceleration ability of the car. The greater the reserve power of the car, the better the power of the car. Because of CVT's stepless speed change characteristics, it can obtain the transmission ratio of maximum reserve power, so its power performance is obviously better than that of mechanical transmission (MT) and automatic transmission (at).

question

CVT has a wide working range of 7.3: 1, which is the leading proportion in the world. It can make the engine always in the best working condition, thus improving the combustion process and reducing exhaust emissions. The actual test shows that the exhaust emission of CVT is reduced by about 10% compared with the car equipped with 4-AT.

4. expenses

CVT system has a simple structure, including about 40% fewer parts than at gearbox, and the quality of the whole vehicle has also decreased. Using this system can save fuel. With the large-scale production and innovation of system materials, the production cost of CVT parts (such as transmission belt or chain, driving wheel, driven wheel, hydraulic pump, etc.) will be reduced by 20%-30%.

5. Driving comfort

Because the speed ratio of CVT is constantly changing, the acceleration or deceleration process of the car is very gentle, driving is very simple and safe, and users can get all-round driving pleasure.

Why does Nissan love to use cvt?

Why do Japanese cars like CVT gearboxes so much? I didn't know this benefit until I saw it. Very practical.

As we all know, most models of Nissan and Honda in Japanese tributary brands basically adopt CVT continuously variable transmission.

Such as Corolla, Lei Ling, RAV4, CR-V, Fit and Pentax. It is owned by Honda, and other models such as Hacker, Qi Jun and Chita are owned by Nissan, although other manufacturers such as Subaru, Mitsubishi and Suzuki also have models equipped with CVT gearboxes.

Why do Japanese cars use CVT gearboxes eccentrically?

Explain the definition of CVT first:

The full name of CVT gearbox is CVT, and Wang Wensheng means continuously variable transmission with continuously changing transmission ratio. Compared with the traditional active transmission, the continuously variable transmission has a simpler structure and smaller size. It has neither the huge gear pair of manual gearbox nor the huge planetary gear set of active gearbox. The stepless change of speed ratio is realized by driving wheel and driven wheel, metal belt or turntable.

Why eccentric CVT gearbox;

The advantages of continuously variable transmission have two aspects:

First of all, it is more fuel efficient than AT.

CVT receives power from chain and steel belt for friction notification, because CVT has no gear and no practical gear, which can keep the engine in the optimal speed range. Therefore, CVT has some shortcomings in fuel consumption, such as AT and shuangjushan organic gear, which is fuel-efficient, smooth and without fluctuation. CVT has the advantages of fuel saving, good ride comfort and low failure rate, which makes Japanese manufacturers like to use CVT in small and medium-sized cars.

The traditional American cars have the characteristics of large volume and large displacement, and the characteristics of CVT obviously cannot meet the power demand of large torque and strong power generation. However, in recent years, American cars are gradually adapting to the changes in the market. In order to cope with the increasingly stringent emission regulations, American cars, represented by GM and Ford, have also begun to increase the research and development of CVT.

Second, the manufacturing cost of CVT gearbox is low.

CVT gearbox uses two sets of pulleys instead of huge and bulky gear sets. Compared with AT gearbox, CVT has greatly increased the number of parts, fewer parts, lower cost and lower corresponding failure rate. Japan's first-tier car companies are meticulous and will certainly not let go of the capital control of such a large institution.

The concept of Japanese cars may be directional. Generally speaking, they pay more attention to domestic use, applicability and adequacy. From the streets outside Japan, we can see that there are K cars with extremely small displacement everywhere, which can not only meet the needs of household transportation, but also be economical and environmentally friendly. It is the concept of making cars for most Japanese brands, and it is more inclined to "waste" and then think about enjoyment on the basis of waste.

Although Japan does not fully accept CVT, it turns out that Aisin, the largest gearbox manufacturer, is playing with the gearbox and playing well. Brands seeking driving control like Mazda are also there. If CVT in Japan supplies small and medium-sized family cars, most ordinary engines with displacement below 2.0T accept CVT.

Of course, CVT also has many defects:

Most models equipped with CVT gearbox have one thing in common: they all use naturally aspirated engines. It can be seen that CVT gearbox and naturally aspirated engine have better things in common, and a gentle driving mode that pays attention to warmth and fuel economy is appropriate. Therefore, CVT has no interest in driving, and it is too smooth and interesting to drive. As for some riders who need activities, they can't bear it, especially when they slow down sharply, and they feel half a beat.

Because friction informs torque, although CVT can accept 400NM torque now, in order to avoid the failure of CVT gearbox, ECU and TCU of the engine cooperate to master the engine torque input in the automatic start stage, so that CVT will not slip because of sudden torque input! CVT is not allowed to slip, once it slips, it is a serious problem! CVT is a gearbox with obvious advantages and disadvantages. The development of craftsmanship can make up for some shortcomings, but some acquired shortcomings cannot be crossed. How to choose really depends more on the degree of rejection of the manufacturer. Why are there many problems with Nissan cvt gearbox? Why do Nissan cars like to use cvt @20 19?