Japanese cars just don't need double clutches. What is the reason?

Compared with domestic cars and German cars, Japanese cars don't need to develop powershift. The smoothness, response speed and transmission efficiency of Japanese CVT transmission are not weaker than powershift. In addition, the core patents of powershift are in the hands of Gatla and Schaeffler. And the cost of developing powershift for Japanese cars is very high. The relatively high failure rate of Powershift is also one of the reasons why Japanese cars are unwilling to adopt it. We know that power shift is mainly divided into dry power shift and wet power shift.

That's because the mainstream technology of gearbox is in the hands of Japanese cars, and people are too lazy to use dual clutch, which is still immature. In the field of gearbox, ZF and Aisin belong to two giants, and Toyota is the shareholder of Aisin gearbox. Before Volkswagen did not play dual clutch, most models used Aisin gearbox. You said that Toyota has such a mature gearbox, why do you still use dual clutch? Compared with domestic cars and German cars, Japanese cars don't need to develop double 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 clutch 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. Among them, dry power shift transmits power through several metal friction plates, which leads to urban congestion. Honda Platinum also adopted an 8-speed wet power shift.

Strictly speaking, powershift is a variant of Honda's parallel axis AT, plus clutch and torque converter, which is not contradictory to the 7 DSG with a height of 6. The performance is much faster than the original parallel axis at. The torque converter can protect the clutch plate and prevent abnormal wear when crawling at low speed. The disadvantage is that some car owners will have oil leakage during long-distance travel. They are aiming at the dual-clutch gearbox, and many other car companies without gearbox technology have begun to play dual-clutch. Many of our independent car companies have adopted dual-clutch gearboxes. Playing does not mean that the dual-clutch gearbox is good, but because the cost of the dual-clutch gearbox is relatively low and there are no technical barriers. Although his failure rate is relatively high.