AMT transmissions are sought after new opportunities for new energy vehicles
On June 29, 2011, Lin Zhongyu, general manager of Nanjing Afu Automotive Control System Co., Ltd., told reporters happily: “Now the industry is paying more attention to AMT. Our AMT monthly sales have exceeded 1,000 units, and there are many cars. Companies to negotiate AMT cooperation projects." Looking at the auto market, many models such as Shanghai GM New Sail, Great Wall dazzling, Jianghuai Tongyue, Changan Benben mini, Changhe Suzuki Big Dipper and others have all launched the AMT version. Almost all hybrid buses operating on the road now use AMT automatic transmissions. In the R&D strategy of SAIC, FAW, and Changan, AMT is in a very important position. AMT is a mechanical automatic transmission. Once upon a time, DCT (Double Clutch Automatic Transmission) occupies an absolute superiority in the battle for various types of automatic transmissions. AT (Hydraulic Automatic Transmission) has a huge application base, and CVT (CVT) is also a strong push for Japanese cars. It is known to everyone that only AMT has the lowest voice and it seems to have been forgotten. Nowadays, the miniaturization of passenger cars, the automation of commercial vehicles and the development of new energy vehicles have brought a rare opportunity for development to AMT. The preferred choice for commercial vehicle automation Compared with passenger cars, the number of commercial vehicles equipped with automatic transmissions in China is still relatively small, but the trend of automatic shifting of commercial vehicles has become apparent. In addition, apart from some city buses equipped with AT, other AMTs have been selected for commercial vehicles that have been listed or tested on the road. Professor Chen Huiyan of Beijing Institute of Technology pointed out that commercial vehicles have developed into multiple gears, and heavy trucks have transformed from 12th to 16th gears. Large passenger vehicles have developed from 6th to 12th gears. The increase in gears has brought about complex shifting operations, which requires shifting. The automation of the operation, otherwise it can not reflect the advantages of multi-speed transmission. In the field of automatic transmissions for commercial vehicles, the advantages of AMT's low cost and fuel-efficient are obvious. The test data provided by Eaton shows that compared with AT, commercial vehicle AMT has reduced fuel consumption by about 20%. In addition, the high-power, high-torque characteristics of commercial vehicles determine that some automatic transmissions are difficult to satisfy, while AMT derived from manual transmissions transmits high torque is a strong point. Yutong Bus Engineer said: “The passenger car AMT is based on the development of traditional manual transmissions. The base of China’s passenger car manual transmission is better, and it has the natural advantage of developing passenger cars AMT.†China National Heavy Duty Truck equipped with AMT A7 heavy trucks has already been listed, AMT developed by Fast and WABCO officially debuted at the Shanghai Auto Show in 2011, and AMT developed by Beijing Starford, Tianjin Zhongde and other companies has been supporting public buses. New energy vehicles bring opportunities What makes AMT companies more excited is the development of new energy vehicles that are prosperous. At the "2011 International Conference on Advanced Automotive Automatic Transmission Technologies" held in April 2011, a number of industry experts pointed out that AMT is an ideal choice for new energy vehicles, especially hybrid vehicles. Li Jun, deputy chief engineer and technical director of China FAW, stated that FAW is developing an AMT transmission for hybrid vehicles. This type of motor is coupled to AMT, and the motor and transmission output shaft are coupled together through a high-strength, silent chain drive to resolve the shift. In the process of power interruption, the fuel consumption is reduced by 40% compared to AT. "From a cost-effective point of view, the AMT-based hybrid power system is the most competitive. In the future, new energy bus transmissions will use AMT as the mainstream," Yutong engineers said. In the Yutong bus transmission planning, the traditional passenger car application AMT has already accounted for the majority, and the new energy bus transmissions are all AMT, including hybrid buses and pure electric buses. Song Jian told reporters that the transmission of a hybrid vehicle needs to control the engine and the motor at the same time, and to achieve fuel economy, AMT is the ideal choice. According to him, AMT, independently developed by them, has provided 300 to 400 sets of Zhongtong buses. At present, Eaton’s AMT is the most widely used in the field of hybrid buses. According to Eaton engineers, there are 3,500 Eaton hybrid AMTs in use worldwide. For pure electric vehicles, although some companies nowadays use motor direct drive solutions, experts in the industry believe that transmissions should be used to increase efficiency and improve vehicle performance. AMT will be favored.
A Carbon Steel Plate has usually been considered as the steel that does not contain much alloy steel elements, also named as mild steel. Generally, elements are C, Mn, P, S, Si, besides these, there are no minimum limits for elements of Al, Cr, Ni, Mo, V, etc.
Carbon steel plates are available in different grades depending on the carbon content and strength.
As the content of Carbon increase, the steel plate hardness increases.
Low carbon steel plate: For carbon content 0.06% to 0.25%, also we call it Mild Steel Plate.
Medium carbon steel plate: C content from 0.25% to 0.55%.
High carbon steel plate: 0.55% to 1.0%, also called hard steel plate.
Low carbon steel is the most common form, and it's very malleable and ductile. Medium carbon steel balances ductility as well as strength for excellent wear resistance. High carbon steel is exceptionally strong, while ultra-high carbon steel can be tempered to even greater hardness but no malleability.
As the percentage of carbon gets larger, steel can become harder and stronger through heat-treating. Carbon steel is usually heated to change the mechanical properties of steel, usually ductility, hardness, strength, and resistance of impact. Increasing the carbon content of carbon steel makes it harder and stronger, but reduces the steel`s ability to be welded, making it more brittle.
Carbon steel plate is most often used for structural purposes such as buildings, yet it has the flexibility to be worked into ornate designs. Low carbon steel sheet (wrought iron) is typically used for fences, chain links, gates, and railings. Structural steel (medium carbon steel) is used in cars, refrigerators, washing machines, buildings, and bridges. The steel sheets are normally made up of medium carbon steel.
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