One of the core components of CVT is steel belt, and all three companies use Dr steel belt. The cooperation between Jetco of Nissan Holdings and Dr. Bosch is closer, and new technologies are often used first by Nissan. Nissan's CVT is advanced because Nissan develops CVT as a core product, while Honda and Toyota use CVT only to reduce costs, as long as they can cope with it, and there are not many requirements. Nissan took the lead in replacing the traditional steel belt with Bosch's pull chain, so that CVT can bear more torque and change its weakness. For example, QX60 in Britain and finidi are equipped with the latest CVT gearbox. In addition, on the basis of the traditional CV structure, Nissan has integrated a set of forms that only a gearbox can change CV into a main gearbox, and the planetary gear set is used as an auxiliary gearbox. The advantage is that it can indirectly improve the speed ratio and effectively improve the soft start of CVT.
Generally speaking, Nissan's CVT is quite innovative and its technology is constantly upgrading. Detko has given up the research on at technology and specialized in CVT. Honda also used CVT gearbox earlier, but it was not ingenious. In those days, Fit still used CVT. Later, Honda developed its own parallel shaft series CVT gearbox, which successfully avoided the patent restriction of Dr. Steel Belt. For example, Civic's 1.5T engine speeds up very quickly, and the gearbox can always maintain a high speed, with a strong sense of movement. However, Honda's CVT is noisy and bears limited torque. The most important thing is expensive. It is cheaper for Honda to buy a gearbox from outside than to develop it by itself, so Honda wants to show that I can build a gearbox, but it does not take CVT as the development direction.
Honda's development focus is still in the engine field, while Toyota gives the impression that it is quite satisfactory, as are the engine and gearbox, not the best, but not bad. AT present, Toyota's models on sale are mostly CVT and Aidong AT. Toyota's CVT pioneered the patented technology of coaxial dual-outlet oil pump. Simply put, the design of double-outlet oil pump is to make the gearbox use two different oil circuits under different working loads. When driving at a constant speed or slowing down, the gearbox can be switched to the low-pressure outlet, thus reducing the working load of the gearbox oil pump and reducing the energy loss of the oil pump by 30%.
Toyota has been working hard to save energy and reduce consumption, but it has not solved the real disadvantage of CVT. In terms of technical adjustment, Toyota Honda is more radical, much like AT gearbox, and Nissan CVT is more moderate.
Toyota started to accelerate quickly, but its power performance was not as direct as Honda's in the middle and late period, while Nissan gave people a stable feeling. Generally speaking, Nissan's CVT is a little more advanced, but the gearbox is only a small part of it. It is impossible to buy a car just by looking at the gearbox. The appearance, price, configuration and safety of vehicles are also aspects that we need to consider.