Many comments on the Internet said that this dual clutch often has problems and is not easy to use. This old-fashioned AT gearbox also feels that it does not like to use fuel.
Well, this CVT can't work, doesn't fly? It seems that some people say it's OK, some people say it's kind of problematic, and today you check the information and share it with you.
Is the quality of the CVT gearbox reliable?
The first one, of course, is that the quality of the CVT is not dependable on it. The idea of the CVT gearbox was first proposed by Leonardo da Vinci. Early CVTs used belt drives.
Core components and car life are the same
Later found that this power is too large, the belt can not eat, and then the development of a technology, belt-type elimination, with a steel belt, the core components of this CVT gearbox life and the car is basically the same.
So do not worry that it hangs in advance, so many years of development of the technology is also relatively mature, reliability is also relatively guaranteed, at least slightly more than a double clutch, after all, only a few years of double clutch.
Pressure steel belt life of 300,000 kilometers
One of the core components of the CVT gearbox is called the transmission steel belt. Currently the most widely used is the German Bosch company. It has a patent, called the pressure steel belt, which has a design life of 300,000 kilometers. It is used casually.
CVTs produced by other companies, such as Audi and Schaeffler, produced the chain steel strips, which were stronger than the pressure steel belts in terms of structure or strength, but it was possible to use smoothness and noise. It will be a little bigger.
CVT gearbox slips in early years
Most of the uploads on the net meant that the strength of the CVT was too high. If it was slipping or something like that, the negative news was also quite numerous.
This is related to the structure of the CVT itself. The common automatic gearbox is geared and directly bites together.
CVT is a little bit like a yo-yo that is connected by two steel belts or chains. The one that is thrown off, the two hemispheres are sandwiched by steel belts, and this force is transmitted by clamping the steel belt to generate friction. .
Slippage is the sudden change of speed, Suddenly pull this strength is relatively large, Yo-Yo did not clamp, Then that problem will arise.
CVT slip is a more serious fault
The most telling thing on the Internet is the CVT's slippage. It's not that it's an occasional occasion when it comes to daily use. Occasionally it will come to this matter.
If CVT is a relatively serious fault, I do not know before checking the information. If the failure is serious, the steel belt will be burned. The wheel will hang like this.
Generally it is not slippery, normal use is no problem, really slippery, it may be a big thing, just like this gearbox hit the same level of things.
The current CVT basically does not skid
And in order to protect the gearbox, its own program is correspondingly protected. When it is monitored that slipping may occur, it will increase the contact pressure of the big cone to the strip or limit the output of the engine.
In short, it doesn't make it slip. Either the effort is smaller than the original, or it gets tighter. A slippery is a failure. Basically, we simply cannot meet.
Can withstand relatively large torque
In addition to the current CVT gearbox optimization through design, structural enhancement, banknote investment, intelligent control, etc., the slip chance is already very small, and can withstand relatively large torque.
For example, Bosch's 7th-generation pressure strip can withstand 450 Nm of torque, which is already equivalent to the current mainstream torque of 3.0T engine output.
Our Mercedes-Benz E320, 3.0T engine is also 400 Nm, so we usually use 1.6, 1.4T CVT is not a problem.
CVT does not have to worry about overheat
Then CVT has a place to fly, that is to say compared to the dual clutch CVT it is also connected with the torque converter and the engine, which is the same as the traditional AT gearbox.
Because of this hydraulic force it is not a rigid connection, it does not exist as a double clutch. This friction disc uses excessive heat.
All kinds of double-flashover various kinds of overheating protection can't use this kind of problem, essentially an optimized version of the AT gearbox, we can understand this way.
A small number of CVTs use wet multi-plate clutches
A small part of the CVT gearbox, for better transmission efficiency, will also be connected with the wet multi-disc clutch and the engine, but it is also liquid and will not shift when driving.
Because the CVT doesn't shift, the clutch doesn't need to be combined and separated frequently. Even this structure doesn't need to worry about overheating or unreliability.
CVT reliability is better
So CVT Overall reliability is still very good, at least at present, then the world has more than one hundred models of vehicles with CVT, more than the total number of units to 20 million units.
In all automatic CVT models which accounted for 18 percent, with so many years, daily household moderate displacement and the displacement of the car, using them is quite reliable.
How does the CVT gearbox work?
Variable speed
In addition to reliable, how to use it feel? Smoothly as we all know, we used to open the AT is "ah ah cracking cracking" so going forward, that CVT is the "ah ~ ~ ~ ~ ~" it is not the middle of a file One of the stalls.
It's as if we originally walked the stairs one step at a time. Now we are taking the handicapped lanes. Slowly on a slope, you don't feel very hard.
Relatively speaking, the experience you open is very smooth and comfortable.
Transmission efficiency can reach more than 85%
There is also one, because most of the CVT is connected to the engine using a torque converter, and then there will be a lock-up clutch on it.
If these two designs work together, most CVT transmissions can achieve more than 85% transmission efficiency.
The transmission efficiency is better with dual clutch or manual transmission, the transmission efficiency is also 90%, only a difference of 5%, and then it can be replaced with more stability and comfort. In fact, it is also a good choice.
More fuel-efficient
Plus it has no specific gear, just like we walk on a slope, it can be precisely adjusted within this maximum gear ratio range, and it can always keep this engine in the most fuel-efficient state.
Simply saying that when you are driving some cars, it's actually the most fuel-efficient when you have a 3.25 speed. That's why we can't set up this gearbox in advance, either 3 gears or 4 gears.
Simple structure and light weight
The 3.25-speed CVT can do this, and then raise the 3.542-speed CVT to do this thing. This is where it's more powerful. Plus it's simpler in structure and lighter in weight. It's directly related to weight and fuel consumption. of.
Therefore, the benefits of CVT are quite good. The reliability is good and it is fuel-efficient and durable. In the past, this kind of big power car could not be used. Now it is also available. It is a very good choice.
Lack of driving pleasure
It's as if there are no shortcomings, that is, if there are really no shortcomings, then other gearboxes need not be developed, of course.
The CVT's car, which I said just now, is comfortable and fuel efficient, but it's open to boring.
There is almost no mobility at all, and it's comfortable to speed up, but it's because it's too smooth.
It's boring to open up
You have to think about the speed at which our car is driving 350 kilometers per hour. It feels so fast that the flesh on the face is pulled back.
You took a train, the train was super stable, it was 350 kilometers, and there was no problem with reading coffee.
No fun, it's not fun to open, It's not exciting at all. This is where I personally feel that CVT is the most unpleasant place. After all, it's hard to do it.
What kind of person is CVT suitable for?
People who demand high comfort
Then CVT is more suitable for what friends to buy? Run smoothly, when the city is fast, this speed and deceleration should be very smooth.
Don't get frustrated and frustrated. Get out of comfort, friends with high comfort requirements choose CVT is really a good choice.
People who care about fuel consumption comparison
Then if you are more value-oriented, because it is 3.25 files that I just said, 4.18 files, CVT can do this black technology operation.
So, if you want to save energy in the city, if you want to walk still, you have to brake and move forward again. This type of CVT is very adaptable and economical.
I think about fuel consumption, like to buy CVT is really good, want to open the throttle sometimes to step in the end, so come here, buy CVT is very boring, and then do not buy cheaper.
Fit yourself is the best
Today we are talking about this automatic transmission. Most of the combinations we will see will focus on economic comfort. For example, if Audi uses some CVTs, it should be luxurious and comfortable.
Many Toyota cars in Japan, Honda, and Nissan have a lot of cars using CVTs. It's to save fuel and peace, but you said that Porsche used CVTs so badly that I didn't see them much.
That is the reason, there is no absolute good or bad, just to say that CVT it just meets your needs, this may be the best choice.
