What is the difference between CVT transformer box of traditional fuel vehicle and ECVT gearbox of hybrid vehicle?

The internal structure of CVT of traditional fuel vehicle has two cones, and the connection between the cones depends on steel belt or steel chain. When working, the transmission ratio is changed by changing the size of the two cones. This working principle is very similar to our variable speed bicycle. How about the ECVT gearbox? There are no cones, steel belts or steel chains inside, and there are mainly two motors inside, one is mainly responsible for generating electricity, and the other is used to drive vehicles. The connection between the engine and the gearbox is either through the planetary carrier or directly.

Then why is this ECVT steering box also called CVT steering box? CVT gearbox means stepless speed change, and ECVT gearbox also belongs to the category of stepless speed change, so it is also called CVT gearbox, but their working principles are completely different, and their internal structures are also very different. For example, in the CVT gearbox of traditional fuel vehicles, the internal steel belt and bevel gear are connected by friction, and the power is also transmitted by friction in traditional power, so this gearbox is easy to slip when it bears a large load. For example, our friends with violent driving habits can easily damage the gearbox when driving this kind of car. For example, there are no accessories such as chasing wheels or steel belts in the ecv gearbox, so there is no such slipping problem.

ECVT gearbox is more durable than CVT gearbox. No matter which brand of traditional CVT gearbox, whether steel chain or steel belt is used inside, the transmission ratio of concealed gearbox is changed by changing the size of chasing flow. The power transmission route of the engine is also from the engine to the gearbox and then to the wheels, but due to the different internal structure of the gearbox, the transmission route of each brand ECVT is different. For example, Honda's ECVT and Toyota's ECVT, because the well-known Toyota ECVT gearbox has two motors inside, one is responsible for generating electricity and the other is responsible for driving wheels, but it also has a very important structure, that is, planetary gear sets. This planetary gear set can change the torque of the engine and distribute the power output mode. There are two ways to work, or pure electric drive. That is, the motor drives the gear, or the engine and the motor jointly drive the gear, that is, the hybrid drive mode. What's the internal structure of Honda? There are also two motors, but it has no planetary gear sets. It has a clutch structure. This clutch structure can also be understood as a power distribution unit.

The driving mode is either low-speed pure electric driving mode, medium-high speed or accelerated engine direct driving mode, or mixed driving mode of engine and motor, but the proportion of mixed driving mode is very small, and most of the time it is either mechanical driving or pure electric driving. Supersystems like BYD's b mi in China or DHT in Great Wall are mostly mixed logic. Therefore, in the hybrid mode, BYD and Honda's hybrid modes will be more abundant, but in the internal structure, because Toyota adopts the planetary gear carrier, it is widely used in at gearboxes. This structure is relatively stable, and its later durability will be better.

The planetary gear train knot developed by Toyota also has its own patent, which leads other car companies to avoid this patent and find another way when developing ecvc gearbox. Therefore, many people say that there are two kinds of hybrids in the world, one is Toyota and the other is others. In fact, this statement is only different in structure, which does not mean that Toyota's hybrid system is the best hybrid. Although the CVT gearbox of this traditional fuel vehicle and the E-class VT gearbox of hybrid vehicle are named CVT, their structures and working principles are completely different, because CVT itself is a general term for inorganic gearboxes, as long as it belongs to the category of inorganic gearboxes, it can be called CVT gearboxes, and CVT and e CVT are irreplaceable, without saying who is good or who is bad.