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Figure 1 Trends in the global automatic transmission market 
Figure 2 New generation CVT development process 
Figure 3 Differences in injection speed and filling conditions 
Figure 4 Panorama of Gatco (Guangzhou) Automatic Transmission Co., Ltd.
Board Thickness : 4.0-7.0mm
Wearing Layer Thickness :0.3mm,0.5mm as regular
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Finish :UV-Coating
Installation :Click system(Unilin,Valinge)
Delivery Time :15-25 days
Size:648mm*108mm
Backing Foam :IXPE(1.0mm,1.5mm,2.0mm) EVA(1.0mm,1.5mm)
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Continuous improvement of the Gart CVT
The vehicle equipped with the automatic transmission can automatically match the speed and torque (force) generated by the engine to the speed and driving force that is most suitable for the vehicle, without the need for repeated cumbersome clutch and shift lever operation, traffic jam in the urban area or The driver will not feel tired during long-distance driving. For the purpose of comfortable and safe driving, vehicles equipped with automatic transmissions are increasing year by year.
In markets such as the US and Japan, more than 90% of new cars are equipped with automatic transmissions. In recent years, more than 30% of the vehicles in the Chinese market have been equipped with automatic transmissions, and it is expected to continue to increase in the future.
The trend of automatic transmission
In order to improve fuel performance and reduce CO 2 emissions, the requirements of automotive environmental technologies in various countries are increasing year by year. Depending on the speed change mechanism system, automatic transmissions can be divided into three categories: STEP AT for shifting gears by switching planetary gears, DCT for switching multiple parallel shaft gears, and CVT for continuously variable speed with steel belts and two pulleys.
The trend of the automatic transmission market (from IHS Automotive's 2012 forecast and Gatco's analysis) is shown in Figure 1. In the global market, STEP AT has a tendency to develop from six-speed AT to multiple gears. At the same time, CVT and DCT are increasing. In addition, hybrid automatic transmissions are also increasing.
From the perspective of technological development trends, from the simple driving requirements of 1980, to the gradual evolution of people's pursuit of driving pleasure after 1990. In terms of improving fuel performance, large transmission ratio, small size, light weight and high efficiency design are adopted; for collision safety,
The miniaturization of the drive train is adopted; at the same time, the accelerated use of automotive electronics can also see the evolution of CAN communication and various electronic devices.
Automatic transmissions are also evolving. STEP AT currently has five speeds and six speeds. However, in recent years, there has been a trend toward more gears (seven speeds/eight speeds). CVTs are reduced by wear and the ratio of transmission ratios is expanded. To improve fuel performance, DCT is also continuing to improve on multiple gears.
CVT energy saving effect
The CVT is a continuously variable transmission and is a transmission that can freely control the engine speed. Due to this characteristic of the CVT, the fuel performance of the engine can be operated at a higher state. In addition, in order to avoid inefficiency, the CVT can set the clutch lock of the torque converter in a wide range, and the engine fuel cut-off time can be extended to achieve higher fuel performance.
Even in cities with many traffic jams and traffic lights, where the speed of the vehicle varies greatly and is frequently used, the fuel consumption of the vehicle using the CVT is not large. Therefore, in markets such as China, Japan, and North America where the speed of the vehicle changes frequently, CVT can perform well in terms of fuel economy.
Introduction of the latest CVT technology
Jatco has a history of nearly 50 years of development, production and sales of automatic transmissions. At the beginning of 1980, the steel belt used in the CVT was developed in the Netherlands, and then it was mounted on a car with a displacement of 1 to 1.5 liters in Europe and Japan. Nissan Motors (Gartco, which is now independent) has focused on the research and development of CVTs with excellent fuel consumption since the 1980s. In 1997, it successfully mass produced the world's first 2L displacement CVT, and in 2002 successfully mass produced the world's first 3.5L CFF for large FF passenger cars, followed by the world in 2006. For the first time, it is possible to cover 0.66 to 3.5L displacement with four transmissions.
Now, as a new generation of CVT, Jatco CVT7 (hereinafter referred to as CVT7) and Jatco CVT8 (hereinafter referred to as CVT8), which seek to improve efficiency and improve fuel economy performance by expanding transmission ratio, respectively, are mass-produced and integrated in 2009 and 2012, respectively. It became two kinds of CVTs.
1. Introduction of Jatco's new generation CVT
The development of Jatco's new generation CVT is divided into two phases. The first stage: increased torque capacity and expanded the product line. The second stage: improving efficiency and expanding the speed ratio range, greatly improving fuel economy (see Figure 2).
As of December 2013, Jatco has cumulatively produced and sold 20 million CVTs. In 2012, Gatco accounted for 49% of the world's total CVT market share.
The CVT7 for small cars is the world's first CVT with a sub-shift mechanism. It has a maximum transmission ratio of 7.3 (approximately 20% increase from the previous CVT). The internal wear of the CVT is reduced by 30% and the weight is reduced by 13%. Fuel economy performance increased by 10%. The CVT8 used in medium and large-sized vehicles has improved fuel economy by 10% by increasing the gear ratio by 17% and reducing friction by 40%. The latest generation of CVTs with significant fuel economy performance have been successfully installed in Nissan and Dongfeng Nissan.
2.CVT shell thin wall technology
Including the CVT 8, the outer casing of the transmission is cast in liquid mold in a mold. The thinnest part of the previous case was 3.0mm. To make the transmission lightweight, Jatco challenged the transformation of it into a 2.3mm manufacturing technology. The attempt to make a wall thickness of 2.3 mm on a large part such as a CVT casing is the first in the industry.
(1) Thin walling is a battle with speed. For the forging of injecting viscous molten aluminum into the model, if the model is not filled before the liquid aluminum solidifies, the casting will be incomplete, and the wall thickness will be The thin part is the fastest heat loss in the model, so the liquid aluminum will solidify very quickly. In order to fill the entire cavity before solidification, it is required to fill at a speed 40% higher than the original. In order to achieve thinning and accelerate the flow rate of liquid aluminum, it is the key to the success of thinning to allow aluminum to spread throughout the model as early as possible.
(2) Accelerating the injection speed will damage the model. If the liquid aluminum is pressed out faster than before, the piston should be accelerated (increasing the injection speed). High-temperature liquid aluminum circulates at high speed in the lumen (the portion of the aluminum that provides the aluminum in the model), and the inner wall of the lumen wears slowly, eventually breaking. In order to control the amount of wear, by changing the cross-sectional area through which liquid aluminum flows, the flow of liquid aluminum per unit time is constant, thus reducing the damage to the model by controlling the flow rate of aluminum. However, excessively increasing the cross-sectional area leads to deterioration of quality. By first developing the production technology and repeatedly performing numerical analysis and testing, the most appropriate shape is finally obtained.
(3) Technique for controlling the injection speed The injection speed of the casting machine is not constant, and there are two stages of low speed and high speed. In the thin-walled part where only a small amount of aluminum is required, the speed is high, and as a result, some parts are not completely filled. In the case where the liquid aluminum is about to fill the thin wall and the injection speed is changed to a high speed, the air inside the mold is mixed in the aluminum to generate pores. Therefore, the control methods of the two injection speeds of low speed and high speed are selected. When the aluminum liquid passes through the thin wall portion, set a medium speed that is not too fast or too slow, and divide the speed into three stages of low speed, medium speed and high speed (see Figure 3). As a result, aluminum can quickly completely fill the entire model, and mass production of high-quality thin-walled shells is achieved.
The thin-walled casing technology described above is one of the examples of improved fuel performance and material reduction of automatic transmissions. Jatco will continue to use this lightweight technology as its core to provide customers with more environmentally friendly products by continuously improving the quality of forging, casting, processing and assembly, and with efficient production.
China's CVT production system
Jatco is actively promoting production in close proximity to customers. In addition to Japan, CVT production plants have been opened in Mexico (2003), China (2009) and Thailand (2013).
In China, Jatco established Gatco (Guangzhou) Automatic Transmission Co., Ltd. (see Figure 4), and introduced the latest CVT production technology, introduced the latest processing and heat treatment technology, and has become 100 in just a few years. An advanced factory with a capacity of 10,000 units. At present, there are 2,300 employees. Since 2009, the steel belt CVT for medium-sized FF vehicles has been produced. The CVT (Jatco CVT7) with sub-transmissions for small FF vehicles started in 2011 and the new medium-sized FF automotive steel belt CVT started in 2013. Production of (Jatco CVT8). Currently, it is supplied to China's automakers such as Dongfeng Nissan Passenger Vehicle Company and Dongfeng Motor Group Co., Ltd. passenger car company.
In January 2012, the company established the Quality Technical Center (QTC), which aims to promote the development and quality improvement projects in China by mastering the needs of Chinese consumers and their use of vehicles, and strengthening the localization system of parts. .
Conclusion
CVT is a precision auto parts consisting of about 500 parts. It is used to cut and open holes for forged or cast parts, and then heat treatment to improve the surface quality of the parts. After the assembly of each part is completed, it will be inspected on the terminal test machine and will be shipped to the OEM.
In order to continuously provide high-quality products, Gart can adopt its own unique production method “JEPS (JATCO Excellent Production System)†to maintain the high quality of all products produced by the factory.
According to the changes of customers, we will respond to the world's first manufacturing with high quality, low cost and short delivery time. JEPS will purchase the raw materials from the processing to the same process as the production line from assembly to shipment. Running at speed and sequence, this is a very efficient production and supply system.
Gatco (Guangzhou) shoulders the mission of JATCO Group “creating value for customers, car culture, and society†and contributes to the development of China's automobile industry in the future.