Compared with domestic cars and German cars, Japanese cars don't need to develop dual clutches. The smoothness, response speed and transmission efficiency of Japanese CVT gearbox are no less than those of dual clutch gearbox. In addition, the core patents of the dual-clutch gearbox are held by Getrag and Schaefer. However, the cost of developing dual clutches for Japanese cars is higher.
Even the oil-lubricated wet dual-clutch gearbox has low wear rate and failure rate, but its transmission efficiency is also very low. Therefore, in terms of quality and reliability, the dual-clutch gearbox is difficult to be accepted by relatively conservative Japanese car companies.
Therefore, Japanese car companies will not take the dual-clutch gearbox as the main technical development route, regardless of cost or use level. Many consumers are already familiar with the dual-clutch gearbox, and its advantages of fast shifting speed, high transmission efficiency and low cost are favored by car companies. So why are Japanese car companies not keen on dual-clutch gearboxes? In fact, Honda has also introduced an 8-speed dual-clutch gearbox before, but it has not been popularized due to factors such as cost. Then, why don't Japanese car companies, which are at the forefront of hybrid power and hydrogen energy, continue to develop dual-clutch gearboxes?
Compared with domestic cars and German cars, Japanese cars don't need to develop dual clutches. The smoothness, response speed and transmission efficiency of Japanese CVT gearbox are no less than those of dual clutch gearbox. In addition, the core patents of the dual-clutch gearbox are held by Getrag and Schaefer. However, the cost of developing dual clutches for Japanese cars is higher.
The relatively high failure rate of dual clutch gearbox is also one of the reasons why Japanese cars are unwilling to adopt it. As we know, the dual-clutch gearbox is mainly divided into dry dual-clutch gearbox and wet dual-clutch gearbox, in which the dry dual-clutch gearbox transmits power through multiple metal friction plates. If the clutch is in the state of separation and semi-separation when it is used in urban congested road sections, excessive dry friction will lead to high temperature and overheating protection, which will lead to clutch damage over time.
Therefore, Japanese car companies will not take the dual-clutch gearbox as the main technical development route, regardless of cost or use level.