CVT stepless gearbox
The full name of CVT is Continuous Variable Transmission, which means "mechanical continuously variable transmission", which is what we often say is a continuously variable transmission. The system components of the CVT mainly include a driving wheel set, a driven wheel set, a metal belt and a hydraulic pump. The transmission belt uses a transmission belt and a main and driven wheel with variable working diameter to transmit power, which can make the power train and the engine working condition. Achieve the best match.
Advantages and disadvantages of CVT continuously variable transmission
advantage
●Because there is no transmission gear of the general automatic transmission, the resulting shifting sensation is also lost. Therefore, the power output of the CVT transmission is linear and smooth in actual driving.
●CVT's transmission system theoretically has an infinite number of gears, and the gear setting is more free. The gear ratio, speed ratio and balance of performance, fuel consumption and exhaust emissions in the traditional transmission system are easier to achieve.
● The mechanical efficiency and fuel economy of the CVT transmission are much better than the ordinary automatic transmission gearbox, which is second only to the manual transmission gearbox, and the fuel economy is much better.
Disadvantage
● Compared with the traditional automatic transmission, the CVT is not used in the car for a long time. There are not many CVT vehicles in the domestic market. This means that the cost of CVT maintenance is relatively high, and if the operation is not proper, the probability of the problem is even higher. high.
●CVT gearboxes have limited torque. Except for the Audi A6 Multitronic gearbox, the general CVT gearbox cannot withstand large loads and can only be used in small cars with displacements ranging from 1 liter to 1.5 liters.
The true life of CVT continuously variable transmission
There are many types of CVT structures, but the most used on the car is the structure of steel belt and cone wheel. The steel belt and cone wheel are also the core structure we usually use to measure the true life of CVT. Bad, the other structures are generally not bad. Although the steel strip is more susceptible to damage than the cone wheel, the current steel strip structure has a service life of up to 300,000 km.
The practice of affecting the life of CVT
1, neutral sliding
The automatic transmission is hydraulic control, it requires a stable hydraulic system pressure, and the oil pump power comes from the engine. In the neutral state, the oil pump does not have enough power, which will result in insufficient oil pressure.
2, D block suddenly changed to N block
Then, if the D block suddenly changes to the N block when the car is turned on, the oil pressure will come down, which will cause poor lubrication of the running parts and the pressing parts, and eventually cause pressure relief inside the CVT gearbox or high temperature.
3, often driving intensely
The torque that the CVT itself can withstand is not great. You still have to push the power of the throttle to squeeze it. This is not difficult for people. In addition, long-term intense driving is easy to trigger the transmission overheating protection. Once the overheat protection is triggered, the general speed limit is 70 to 80 kilometers per hour.
4, poor maintenance
The structure of the CVT gearbox is different from that of other automatic gearboxes. It requires different oil flow rate, friction performance and expansion coefficient parameters. If you add any ordinary automatic transmission oil, it will be sooner or later. Things.
