current position：Home>Japanese cars love CVT. Why do Chinese dislike it?
Japanese cars love CVT. Why do Chinese dislike it?
2021-08-28 07:02:09 【Wechat automobile】
When people buy cars , Not only the model will be considered 、 Price , And also consider the safety of this car and how the three major parts . The three major parts in a car refer to the engine 、 Transmission and chassis . At present, the manufacturing technology of both joint venture cars and domestic cars is much better than before , At present, the marketing strategy of many domestic cars is to focus on 15 Automobile market below 10000 yuan , Because this price range is the most concentrated range of consumption in the Chinese market , Limited to this price range , The cars produced , Whether it's configuration 、 Space and other aspects are more demanding than joint venture vehicles , Only in this way can it be recognized by consumers , To get better sales .
Tongge recommends various models to you every day , But there are a lot of fans in the backstage comment area who will say ： Most domestic cars now use double clutch gearbox , Worried about the high failure rate , Dare not buy . When tongge recommends other domestic cars or Japanese cars , And they said ： These are used for CVT transmission , Not good either. . Brother Tong talked about double clutch gearbox before , So let's talk to you today CVT transmission .
#1 CVT The principle of transmission
In the beginning , In fact, the double clutch gearbox is not the patent of Japanese cars , As early as 1886 The use of V Type rubber belt CVT As a gearbox for gasoline vehicles . stay 1958 year , In the Netherlands DAF The company has successfully developed a double V Rubber belt type CVT, And carry out market-oriented sales , Sales have exceeded 100 Thousands of cars . stay 1987 Beginning of the year , Development of electronic control system by Subaru, Japan CVT, And assembled in Justy models , And in the 1987 In the second half of , Ford launched in Europe with CVT The Ford Fiesta with gearbox , Fiat of Italy launched CVT Transmission Uno models . Including European car brands such as Audi , There are also many models equipped with CVT transmission .
CVT The full name of the transmission is （Continuously Variable Transmission）, And AT、DCT The transmission is different ,CVT It's a continuously variable transmission , The gears in the traditional step transmission are replaced by a pair of pulleys and a steel belt , The pulley block is composed of two vertebral discs V Shape structure , The engine shaft is connected with a small pulley , The large pulley is driven by a steel belt , So as to output power . therefore CVT The volume of the gearbox can be smaller , And the principle is simpler .
commonly AT Both the gearbox and the double clutch gearbox have many gears , such as 8AT transmission , There is 8 Gears with different gear ratios ,7 Fast double clutch gearbox , There is, there is 7 Different gears . and CVT In fact, there is no saying of gear , So we'll see on the configuration table for CVT The description of the gearbox will generally be ：CVT（ simulation 10 files ）. because CVT There is no transformation and connection between gear sets in the transmission , So ride comfort is CVT The biggest advantage of the gearbox .
#2 CVT Advantages and disadvantages
CVT Advantages of gearbox ：
1. CVT There is no interruption of shift power and shift impact in the transmission , So the power output is more linear when the vehicle accelerates 、 Smoother .
2. CVT The transmission efficiency of the gearbox is high , And better fuel economy . because CVT When the speed of the transmission increases , No gear shift , Therefore, there will be no power interruption between the engine and the gearbox , Transmission efficiency ratio AT It's better to wait for the gearbox .CVT In theory, there can be an infinite number of gears , Gear setting is more free , Gear ratio in traditional transmission system 、 Speed ratio and performance 、 Fuel consumption 、 Balance of exhaust emissions , Are easier to achieve .
3. before CVT The transmission cannot withstand excessive torque , But with the development of Technology , at present CVT The gearbox has been able to withstand 400N·m torque , Power take-off for most family cars . And there are some CVT In order to enhance the torque tolerance of the transmission , Also joined the 1 Starting dimension of gear , In this way, it will be more practical .
CVT The disadvantages of the gearbox ：
1. Lack of driving fun , Many young people prefer to pursue the pleasure of car driving ,AT Or the dual clutch gearbox can let the driver experience the rhythm of shifting , And the vehicle speed can be freely controlled through the paddle , and CVT The gearbox is boring to drive .
2. CVT The manufacturing cost of gearbox is slightly higher , Universal reliability does not AT The gearbox is so ideal , And if you don't do it properly , The probability of problems is higher . however CVT Transmission in many cases , It cannot be repaired. It can only be replaced as a whole , This is the direct cause of its high maintenance cost .
3. The sports car 、 The car 、 Hardline SUVs, etc , Because their working condition positioning requires the engine to provide stronger torque , and CVT Due to the use of steel belt connection , Problems such as slipping and gearbox failure are easy to occur during large torque output , So it's not suitable for this kind of vehicle .
#3 At the end
Each gearbox has its own advantages and disadvantages , But judging from the various transmissions on the market ,AT The gearbox is still the one with the lowest trial and error cost . Whether it's AT、DCT still CVT transmission , In the final analysis, how does it feel to drive , The most important thing is to see how well car companies can adjust their vehicles . Adjust well DCT perhaps AT The gearbox can also drive smoothly , And a poorly adjusted gearbox , Shifting is slow , Low speed shift stumbling and other situations are still common . Do manual work 、 Good in adjustment CVT transmission , Can do the same 20W Km no fault , And can also withstand large torque output .
I want to say , Don't because of a certain car , Because of the use of a certain gearbox, it is not included in the scope of purchase , The important thing is that car companies build cars 、 How about the technology and skill of vehicle adjustment , And when you're driving , Also develop good car habits .
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