The viewpoint of this paper: CVT gearbox oil needs to be changed regularly, and it is unlikely to achieve lifelong maintenance-free at present. It is suggested to change it to about 8-65438+ 10,000 kilometers.
First of all, although the internal structure and working principle of CVT gearbox are different from manual and automatic gearboxes, they all rely on friction to generate power transmission, so as long as there is friction, metal chips will be produced, and with the increase of time and mileage, these metal chips will become more and more. If they are not taken out by oil change and filter element in time, the electromagnetic valve inside the gearbox will be stuck and fail, the lubrication and cleaning function of gearbox oil will be reduced, and even some oil circuits will be blocked in serious cases, resulting in gearbox failure. If the solenoid valve is stuck, it is usually enough to replace the solenoid valve or valve body assembly. If the steel belt and pulley are excessively worn due to reduced lubrication function or blocked oil circuit, it is estimated that a second-hand gearbox will be replaced, because the combined price of these two things is almost equal to a second-hand gearbox.
Secondly, according to the actual situation of the after-sales market, taking Nissan's CVT gearbox as an example, most of the faults are around10–150,000 km, and they all have a common feature, that is, the gearbox oil has not been changed once before. On the contrary, those who have changed the transmission oil before this are basically fine. At present, if most CVT gearboxes manufactured by Nissan are replaced by gravity oil, only about 6 liters of CVT special oil can be used. At the same time, it is recommended to remove the transmission oil pan and internal filter screen for cleaning, so that it can be handled more cleanly and thoroughly.
Therefore, it is suggested that the majority of friends with CVT gearbox models should try to change the gearbox oil around 8-65438+ 10,000 kilometers to avoid subsequent failures and unnecessary economic losses.
I hope my answer can help you.
20 thousand kilometers for half a pot of oil, don't go to 4S shop, don't use recycling machine. Your CVT will last a lifetime.
The structure of cvt is mainly composed of two groups of pulleys (driving pulley and driven pulley) and transmission belt (steel belt) oil pump, hydraulic torque converter, actuator (valve body and oil circuit), sensor and computer.
1. The function of the hydraulic torque converter is to transfer the torque of the engine to the cvt, so that the car can start forward and backward smoothly. Hydraulic torque converter can amplify the torque of the engine and make it start faster. When the vehicle speed reaches the set speed, the pump wheel (the wheel connected to the engine) and turbine wheel (the wheel connected to the cvt) of the hydraulic torque converter are locked, and the transmission efficiency at this time reaches 100%. Another function of hydraulic torque converter is to reduce the impact force from engine and road surface and prolong the service life of transmission parts.
2. Variable diameter pulley cvt has two groups of pulleys (driving pulley and driven pulley), and each group of pulleys is divided into two halves. One side of the pulley is fixed, and the other side of the pulley can slide on the shaft. The inner sides of the two pulleys are conical surfaces with inclined angles, and the two sides are opposite to each other to form a V-shaped groove, which is in contact with the side surface (meshing point) of the transmission belt. By controlling the clamping and loosening of the driving wheel and the driven wheel by oil pressure, the working diameter of the meshing point between the pulley cone and the transmission belt is changed (that is, the diameter of one wheel increases and the diameter of the other wheel decreases), thus changing the transmission ratio. (When the diameter of the driving wheel is small and the diameter of the driven wheel is large, it is in a deceleration state to improve the torque. When the diameter of the driving wheel is large and the diameter of the driven wheel is small, increase the speed.
3. The high-strength steel belt transmission belt consists of two bundles of annular steel belts and a pusher, each group has two bundles of annular steel belts, and each bundle of steel belts is formed by overlapping 12 layers (sheets) of high-strength steel sheets. The steel belt is made of t702 high-strength steel (the tensile strength of each piece reaches 2000mpa), and the pusher is composed of more than 400 high-strength pressure steel plates. The function of the annular steel belt is to press the push piece on the V-shaped groove of the pulley, so that sufficient friction force can be generated between the push piece and the pulley, and the push piece can slide longitudinally in the straight section of the steel belt, and the function of the push piece is to transmit torque through extrusion thrust. The biggest feature of Dongfeng Nissan steel belt cvt is "push transmission".
4.asc intelligent logic control system On the basis of the second-generation cvt, the third-generation cvt imported originally adopted a more advanced asc control unit. The number of variable speed conversion modes has increased from 20 to more than 700. Through the information provided by sensors such as accelerator pedal, engine speed, vehicle speed and shift lever position, the computer can calculate and judge the driver's intention at any time, and then send control instructions to the execution system to provide actions that meet the driver's wishes at any time, and command to complete the execution actions such as forward and reverse gear switching, rapid acceleration, manual mode, economy mode and engine braking. High response execution system (including oil pump, solenoid valve, etc.). Gear switching device) can quickly and accurately execute various instructions issued by asc control unit.
CVT transmission oil can only be replaced after about 60,000 kilometers. Friction between steel belt and helical gear will be lost. If you want the gearbox to last a long time, you'd better maintain it on time. So as not to lose big because of small.
Tell you that the oil of Audi's analog 8-speed gearbox even the 4s shop says that it is usually changed every 60,000 kilometers, and the service life is almost 5-6 years! Explain that this time is still no problem. As we all know, it is best for you to change the 4s shop every day, not too early!
Change cvt oil every 50,000 kilometers.
Less than 20 thousand kilometers in 3 years, do you want to change the variable tank oil?
About forty-six thousand. More than 30,000 yuan for Buick's maintenance-free service also requires maintenance and replacement of transmission oil. Valve body oil does not need to be replaced for life.
I think this thing is very expensive. Personally, I think it's about two kilometers from home. It takes a lot of oil to come to the store in the morning and go back at night.
Oil will not expire?