Why are most of Japanese car automatic transmissions CVT transmissions?

The use of CVT gearboxes in automotive powertrains used to be the preserve of Japanese cars, but with the continuous development of CVT transmission technology, more and more non-Japanese cars have begun to experiment with CVT transmissions.

The full name of CVT gearbox is continuously variable gearbox, and the most advanced CVT gearbox technology should be Nissan Motor's Jiecott, which is also the exclusive transmission provider of Nissan, Mitsubishi, Mazda, Renault and other famous car brands. ‍

In fact, the main reasons why so many models of Japanese cars use CVT gearboxes are as follows:

1. Good fuel economy, the CVT gearbox will immediately accelerate the vehicle by upshifting when it reaches the optimal speed of the engine, so as to avoid the waste of gasoline caused by human reasons.

2. The power output is smoother, and the CVT gearbox is currently the best gearbox for acceleration and driving smoothness, whether it is on congested urban roads or at high speeds, the passengers can basically not feel the frustration brought by the car.

3. The failure rate is low, and the highest failure rate of the general gearbox should be the gearbox with dual clutch, and the CVT gearbox is generally very stable and durable.

At present, the mainstream automatic transmissions used in automobiles are AT transmission, DCT (or DSG) transmission, and CVT transmission. Among them, the AT gearbox is the most common, the DCT (or DSG) gearbox is currently dominated by German cars or domestic brands, and the CVT gearbox is the favorite of Japanese cars, of course, some domestic brands are also used.

We know that the two world-class manufacturers of AT gearboxes are Japan's Aisin and ZF (ZF), which shows that Japan does not lack AT gearbox technology, but in contrast, Japanese cars are still equipped with CVT gearboxes, especially more economical models. The reason for this is also closely related to Japan's development philosophy.

Japanese cars generally have low fuel consumption, we know that there are many factors that affect the fuel consumption of automobiles, in addition to the engine and gearbox, there are also final reduction ratios, vehicle weight, drag coefficients, tires, etc., of course, engines and gearboxes are the two most important factors. There is no need to talk much about the engine technology of Japanese cars, but how much influence is the influence of the gearbox, especially the CVT gearbox?

CVT gearbox, also known as continuously variable gearbox, its structure is relatively simple, mainly by the driving wheel, driven wheel, metal belt and hydraulic pump and other basic components, of which the metal belt is composed of two bundles of metal rings and hundreds of metal sheets, the driving wheel and driven wheel are composed of movable disc and fixed disc, and the side of the pulley close to the cylinder can slide on the shaft, and the other side is fixed. Both movable and fixed discs are conical structures, and their cones form a V-groove to engage with the V-shaped metal drive belt. The power output from the output shaft of the engine is first transmitted to the driving wheel of the CVT, then to the driven wheel through the V-shaped transmission belt, and finally to the wheel through the reducer and differential to drive the car.

The working process of CVT transmission is to change the working radius of the meshing of the driving wheel, the cone of the driven wheel and the V-shaped transmission belt by moving the movable disc of the driving wheel and the driven wheel axially, so as to change the transmission ratio. The axial movement of the movable disc is realized by the driver by adjusting the pressure of the driving wheel, the driven wheel and the hydraulic pump cylinder of the driven wheel according to the needs of the control system. Since the working radius of the driving wheel and the driven wheel can be continuously adjusted, continuously variable speed is realized.

It is not difficult to find several advantages through the whole shift process of the CVT transmission: first of all, it is fuel-efficient, because the CVT can achieve continuously variable speed in a fairly wide range, so that the best match of the transmission system and engine working conditions can be obtained, and the fuel economy of the whole vehicle can be improved. The second is dynamics, due to the CVT's continuously variable transmission characteristics, it can obtain the transmission ratio with the largest reserve power, so its dynamics are significantly better than those of MT and AT gearboxes.

In addition, the wide operating range of the CVT allows the engine to work in optimal conditions, thereby improving the combustion process and reducing the emission of exhaust gases. Finally, there is the cost, the CVT system is simple in structure, the number of parts is less than the AT, and once the car manufacturer starts mass production, the cost of the CVT will be smaller than the AT.

Operator: He Shuguang).

Note that when it is cold, you need to warm up the car, and drive slowly for a while after starting, and do not step on the accelerator deeply. The colder it gets, the more you have to pay attention to this. Also, it's important to change the specified transmission oil regularly, as well as replace the filter and clean the oil pan!

In fact, the current CVT generally uses steel belts or steel chains for power transmission, and the transmission mode of CVT is steel belt transmission, and the gearbox will change the optimal transmission ratio according to the load of the engine when driving, so as to reduce the load of the engine and achieve the purpose of fuel saving. Does it mean that all CVTs can be used for more than 300,000 kilometers? Therefore, when we talk about transmissions, we should not use individual exceptions as a criterion, but rather the average life of the overall (most) CVT.

<> shows that the overall is reliable, that is to say, the vast majority of CVTs are durable enough; In fact, CVT and DCT (dual clutch) are examples of indurability in the eyes of all riders, and the test items are very extreme and demanding! Because only by simulating the operation state that is far more demanding than the actual road conditions to test, in order to ensure that the transmission does not have problems in real use, when Mr. Da Vinci invented the CVT, the problem of the transmission steel belt should be solved, and a considerable part of the criticism of the CVT transmission comes from the slippage of the transmission steel belt. And the longer it goes, the more obvious it becomes.

But this estimate can't be considered a reliability issue.

The problem of the early CVT transmission has long been solved, the CVT transmission is mainly controlled by oil pressure, and the oil pressure of the transmission increases rapidly in the process of CVT transmission power, which can effectively prevent the transmission from slipping. , I am Geely's new research and development plus CVT, fuel consumption is good, the ride is also very good, is the start of acceleration, the throttle down a little bit I feel that his power is not up, and Guo over the traffic light, put the brake feel that the car did not react.

This is not the case, because nowadays CVTs usually use steel belts or chains for power transmission. The transmission mode of CVT is steel belt drive. When driving, the gearbox will change the optimal transmission ratio according to the load of the engine, so as to reduce the load of the engine and achieve the purpose of fuel saving.

It's really like this, because the gearbox of Japanese cars doesn't have many core technologies, so it's relatively bad.

This is true, because the CVT gearbox has a downside, and that is the very high failure rate.

What are the advantages and disadvantages of gearboxes? Why are most Japanese cars equipped with CVT transmissions?

The quality is very poor and it breaks easily.

Historically, Subaru has been the first to use a CVT gearbox (jointly developed with the Dutch VDT) in the global market as early as 1987, and the first to use a chain in Japan to transmit power, and the torque CVT that can withstand is the lifeblood of Nissan (Jatco), and from this point of view, Nissan's CVT technology is the most advanced. Nissan is also the first of these three Japanese companies to promote CVT, and its technology accumulation is also the best. Nissan's gearbox is tuned more conservatively, like a new gadget must be Nissan the first to use!

Why is Nissan's CVT more advanced (don't talk about the failure rate if it's advanced at the technical level, one yard is one yard), because Nissan Xiaohe develops CVT as a core product, while Honda and Toyota have limited use moments, and are currently assembled on ,,, several engines, and the hybrid system's E-CVT is not a CVT in the traditional sense, and it is not explained. At present, Toyota's latest CVT gearbox has added a low-speed gear set, so that the start is fast and solved.

<> paused slightly, but in fact, this one does exist, do you know why? The reason for talking is very simple, Nissan's CVT gearbox is not just a CVT, it is actually a two-liter return gearbox, one is the well-known CV T gearbox, and the other is an AT transmissionA change in life. All of Honda's gearboxes are basically self-made, the quality control is very strict, and the engine technology is Honda's strong point, and the posture experience brought by the technology that matches the gearbox is relatively good.

But Honda in the CVT gearbox manufacturing sample, usually there are no problems, suspect that CVT life and slippage are hearsay, design life and engine the same, technical tuning, Toyota Honda is more aggressive, much like AT gearbox, Nissan CVT is more mild.

When the danger is in front of it and it suddenly speeds up to dodge, it doesn't, or it brakes sharply to let the car behind it rear-end, or it will die. Of course, this situation is rare in a lifetime, but if you catch up, you are unlucky! Is the CVT gearbox okay?!

The best should be the kind of thick return code tremor with this appearance.,And there's sheet metal on it.,And then this speed is very fast.,When the mold is launched, you can instantly lift the speed.。

The best gearboxes are Honda branded, **medium, and have a very long life of use.

The best CT gearbox in Japanese cars is Honda , which has strict quality control, basically no problems, and a long service life.

This is a false proposition, when will the thunder car use CVT! Understand for yourself.

This is because the CVT gearbox has advantages, is not prone to failure, is relatively strong, durable, and low cost, so most of the automatic transmission cars will use this kind of transmission.

Because this kind of gearbox is more fuel-efficient, it can make the engine run at high speed, so that the power is sufficient, and the experience feels better.

Because this kind of gearbox is very fuel-efficient, the structure is very simple, and it is very easy to repair after breaking, which can save costs.

Because it can earn money in the pockets of car owners who don't understand cars and just want to save fuel and maintain value.

Japanese cars equipped with CVT transmissions account for about 80% of CVT models on the market. In addition to the simple structure and cost control, the use of CVT in Japanese cars still has its "parent advantages". For example, Nissan's CVT gearbox from small cars to large-displacement vehicles is basically one of the 75% automatic transmission plants controlled by Nissan Motor Company, and most of Toyota's small-displacement models, such as Corolla and Yaris, are basically equipped with the CVT transmission of Aisin Japan, a subsidiary of Aisin Seiki, controlled by Toyota.

Its structure is simple and small in size. It doesn't have a lot of gear combinations for manual transmissions, nor does it have a planetary gear set as complex as an AT gearbox. Therefore, it is no exaggeration to say that the CVT is the smoothest and most economical of the three gearboxes.

However, so-called cheap goods are prone to polarization. The CVT has excellent ride comfort, but its weaknesses are also prominent. CVT transmissions rely on steel belts to transmit power, so CVTs are generally difficult to withstand the transmission of large torque, and are not suitable for intense driving operations.

Most consumers prefer to buy Japanese cars because Japanese cars generally have lower fuel consumption. The gearbox is a very important factor that affects the fuel consumption of the car, which is why most Japanese cars choose CVT transmission, because CVT transmission is more fuel-efficient.

CVT gearbox is also called continuously variable gearbox, and the internal structure is relatively simple. Moreover, the CVT gearbox can achieve a wide range of continuously variable speeds, so that the transmission system can be optimally matched to the engine operating conditions, thereby saving fuel consumption. For car owners who drive a lot, the lower the fuel consumption, the better.

If the CVT oil temperature is relatively high in summer, you should also go to the repair shop for repair in time, because most Japanese cars have the advantage of stable fuel economy, which also has a lot to do with the CVT gearbox, because it will be very smooth in the process of shifting gears, so it will be more fuel-efficient than other gearboxes, and it will be very smooth during driving. The above is the reason why most of the automatic transmissions of Japanese cars are CVT transmissions.

It is because CVT is a continuously variable gearbox, and then it is a more ideal state, and the element of composition is a steel belt, which has strong power, good fuel economy, high comfort, and can achieve lifelong maintenance-free effect, and emits less harmful gases.

Because the CVT gearbox is not prone to failure, it is very fuel-efficient, and it is very smooth when changing gears, so that it is very smooth during driving, and the cost is relatively low, which can play a role in saving money, so it will be chosen.

It can have a very good price-performance ratio, and it can also be liked by many people, and this gearbox is also very durable in life. Minor faults can generally be repaired. There will be a very good driving concept and model.