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How to choose the gearbox when buying a car?
- Categories:Industry News
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- Time of issue:2016-04-21 14:05
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(Summary description)Is the more gears of the gearbox the better? Many people have paid attention to this issue for a long time. We are accustomed to categorizing gearboxes simply and roughly into manual and automatic. Manual gearboxes are mainly composed of gears and shafts, which generate variable speed and torque through different gear combinations; while automatic gearboxes are made of hydraulic torque converters and planetary gears.
How to choose the gearbox when buying a car?
(Summary description)Is the more gears of the gearbox the better? Many people have paid attention to this issue for a long time. We are accustomed to categorizing gearboxes simply and roughly into manual and automatic. Manual gearboxes are mainly composed of gears and shafts, which generate variable speed and torque through different gear combinations; while automatic gearboxes are made of hydraulic torque converters and planetary gears.
- Categories:Industry News
- Author:
- Origin:
- Time of issue:2016-04-21 14:05
- Views:
Information
Is the more gears of the gearbox the better? Many people have paid attention to this issue for a long time. We are accustomed to categorizing gearboxes simply and roughly into manual and automatic. Manual gearboxes are mainly composed of gears and shafts, which generate variable speed and torque through different gear combinations; while automatic gearboxes are made of hydraulic torque converters and planetary gears. It is composed of hydraulic control system, through the combination of hydraulic power transmission and gears to achieve variable speed and torque. Whether it is manual or automatic, the key depends on how you look at and choose the configuration when you buy the car.
1. The function of the gearbox
The primary function of the gearbox is to change the transmission ratio; the second is to enable the car to travel backwards when the engine rotation direction is unchanged; then the neutral gear can be used to interrupt the power transmission, so that the engine can start and idle, and facilitate the transmission shift Or perform power output.
Many people are familiar with Toyota’s classic 4AT, and they all think that this 4AT is well tuned, but what is the difference compared with 5AT and 6AT? Let’s first analyze the responsibilities of each gear. The first gear is mainly responsible for starting, the second gear is used for low-speed driving (about 20km/h), the third gear is responsible for urban road traffic (about 60km/h), and the fourth gear is for high-speed cruising. (About 90km/h), the first four gears of 5AT are basically the same as 4AT, the extra 5th gear is an overspeed gear, that is to say, it is prepared for high-speed cruising. Similarly, the sixth gear of the 6AT is also used for high-speed cruise.
It seems very simple in this way. The difference between them is nothing more than the two gears of starting and high-speed cruising. However, for models equipped with 4AT, such as Chixuan, Vios, Corolla, etc., the starting torque does not use that much torque. , And the positioning is also the low-end models of urban mobility, the target groups have little demand for high-speed cruising.
In the case of ordinary urban traffic, the fuel consumption performance of 4AT, 5AT, and 6AT is almost the same. At the same time, the choice of gearbox and the output characteristics of the engine are also very closely related. The density of 4AT gear ratio is not as good as 6AT. The problem is that the drop between each gear is relatively large, which is what we often call smoothness. A flaw. However, any part of the car will eventually be reflected in the price, but the biggest advantage of 4AT is the lower cost, and how to choose it depends on the owner.
2. Japanese gearboxes dominate the market
Overview of the global transmission market, automatic transmission (AT) in the North American market, CVT in the Japanese market, manual transmission in the European market each occupy a dominant position. The dual clutch transmission (DCT), which began to appear a few years ago, will change the existing market structure to a certain extent.
ZF is headquartered in Germany and specializes in providing auto parts such as power transmission, steering, and chassis systems. The ZF Group's automotive powertrain and chassis technology has a world-leading position. ZF Group has an excellent customer base in China, including Shanghai Volkswagen, Shanghai General Motors, FAW Group, Shenyang BMW, Sinotruk Group, Chery, King Long, Dongfeng Group, etc. Products are widely used in cars, buses, trucks, ships and construction machinery vehicles.
Japan Aisin-AW (Aisin) is owned by Toyota and is the world's fifth largest (2013) auto parts manufacturer, and its auto parts manufacturing technology is well-known in the world. Aisin's automatic transmission product sequence is very rich. Because Toyota has a stake, almost all Toyota models use Aisin's automatic transmission. However, in addition to Toyota, its automatic transmission is also widely purchased by other vehicle manufacturers, such as Mazda, Daewoo, Opel, Volkswagen, Fiat, Citroen, and even BMW and Audi.
Japan's Jatco is one of the world's three largest suppliers of automatic transmissions. Its predecessor was the AT/CVT (Automatic Transmission/Continuously Variable Transmission) division of Nissan, and its operations spread across Europe, Asia and the Americas. Jeep Guide, Dongfeng Nissan Sylphy, Ford Mondeo and other models are equipped with gearboxes produced by JATCO. Mainly provide automatic transmissions for most mainstream vehicle manufacturers such as Nissan, Mitsubishi, Mazda, BMW, Volkswagen, Land Rover, Jaguar, Kia, Hyundai, Daewoo, Changan Ford, Brilliance, etc.
3. The number of gears doubles into a trend?
Once a 4-speed automatic transmission was used in most models in the 1990s, but now, the number of gears of the automatic transmission has been doubled. It is not uncommon for models with 8-speed or even 9-speed transmissions.
For example, under Kia, the 2017 Kay Zun has been officially unveiled at the New York Auto Show. The new car is expected to be equipped with a newly developed 8-speed automatic transmission, which is lighter and more sensitive than the current 6-speed automatic transmission. Resulting in a more ideal transmission efficiency.
The 2017 Toyota Highlander has been officially unveiled at the New York Auto Show. The new car is expected to be equipped with a 3.5-liter V6 direct injection engine in the powertrain, which will greatly increase the power, and this is also due to the new car in the transmission system. It is matched with an 8-speed automatic transmission with higher transmission efficiency.
More and more new models have been updated with gearboxes, but whether it is gearbox, suspension, engine or all other accessories, they are all for the performance of the whole vehicle. The only goal is to combine them to meet the needs of this vehicle. The required performance indicators. Therefore, it is not necessary to pay too much attention to and discuss any of the accessories. The most important thing is that the product of the vehicle can meet the requirements of use.
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