At the “3·15†party in 2013, the issue of Volkswagen DSG gearbox was exposed. The problem was mainly caused by abnormal noise, inability to shift gears or even speed, which caused the sales of Volkswagen in China to be damaged. This year's "3·15" party, Land Rover's 9-speed gearbox was exposed to failure, either walking on the road or moving backwards.
1. Why is the gearbox frequent? What is the gearbox? A gearbox is a device that transfers the power of the engine to the wheels. They are usually a metal box with some large and small gears. There are three types of gearboxes, a manual transmission (MT), an automatic transmission (AT), and a dual clutch transmission.
Why is the gearbox so fragile? Many people buy a car to see if the car is fuel-efficient. The traditional fuel-powered car has been trying to improve the fuel economy for decades. It is nothing more than the engine to improve the energy conversion efficiency, the gearbox to reduce the transmission energy loss and the body weight reduction. Engineers of various brands are slowly gathering on the road of optimizing the gearbox when there is not much progress on other roads. Therefore, the gearbox technology is more and more advanced and the structure is more and more complicated. The use of new technologies inevitably poses a risk of reliability and requires time verification. ZF's 9-speed automatic transmission is in trouble.
2, the gearbox gear is not as good as possible. Now every manufacturer has equipped different gearboxes for different models. In addition to the difference between manual gearbox and automatic gearbox, the gearbox has different gears. Four-speed, five-speed, six-speed, seven-speed, eight-speed, and even nine-speed automatic transmissions have already been equipped with manufacturers. However, how should we choose them in the face of them? Is it really the more gears the better?
In fact, what we generally call the gear, it is said that it is composed of several gears in the gearbox. Everyone rides a speed mountain bike. There are several gears of different sizes on the rear wheel of the mountain bike. There are also gears similar to this in the gearbox of a car, and the vehicle is also geared through these gears.
The choice of these gears is also the choice of gearbox gear. In fact, every gear has two gears in service, one drive gear, one driven gear, and two gears. There is a tooth ratio between them, and the size of these gear ratios is the most important detail of each gearbox.
Take the variable speed mountain bike as an example. For a 12-speed variable speed mountain bike (the front two gears, the rear six gears), the first gear, that is, the front maximum gear, the rear gear when the smallest gear is The gear ratio is the largest gear. The acceleration of the vehicle in this gear will be very good, but at the same time, the car people need to spend the most effort. In the first gear of the car gearbox, this gear is also used. The drive gear is far. Follow the driven gear to get the maximum vehicle torque. When the vehicle is driving at a high speed, the driving gear is much smaller than the driven gear, which can provide better fuel economy, but it will be slightly insufficient in terms of acceleration.
3. It is important that the gear ratio matches the engine. It is not important that the automatic gearbox has several gears. The most important is the ratio between the drive gear and the driven gear between each gear. For the four speed. For the automatic transmission and the six-speed automatic transmission, the reason why they are different is because the engineers provided two more gears between the No. 3 and No. 4 wheels of the four-speed transmission driven gear to provide more Dense gear ratio, smoother shifting feel and tighter fuel economy.
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