The importance of the transmission is self-evident, as a member of the three pieces H Beam Connecting Rods of the car, frustration is the most influential driving quality, whether a car has a good power system, not only to see if there is a good engine, Depends on the gearbox and the engine match, then then there is a good gearbox how important it is. Here the gearbox brand is not what we call the public DSG, Porsche PDK, those who are car manufacturers to develop their own gearbox, we are introduced today is the world's leading four gearbox suppliers, together To see what are it ~ 1, ZF - Germany ZF is headquartered in Germany, the world's top 500, is a professional provider of transmission, steering, chassis systems and other auto parts suppliers, ZF Group's automotive powertrain and chassis technology has a world leader. Now the market common ZF transmission models include: Audi (in addition to using CVT and dual-clutch models), the BMW Department, the public part of the models, Porsche, Jaguar, Land Rover, Volvo, etc., you can see the application of ZF transmission Are some European car brands. 2, love letter - Japan Japan Aisin (Aisin) is specialized in the production of automatic transmission of Connecting Rods the enterprise, was established in 1969. It is a joint venture between Aixin Seiki Co., Ltd. and a subsidiary of Aisin Seiki Co., Ltd. Among them, Toyota Group has 22.2% stake in Aixin Seiki. Because Toyota shares love letter company, so Toyota's models are almost always using love letter of the automatic transmission. Outside of Toyota, the main application of love letter gearbox are Mazda, Opel, Volkswagen, Fiat, Citroen, Southeast Motor, Jinbei Automobile, Great Wall Motor, Beiqi Futian and a series of well-known Chinese and foreign car brands. 3, Jie Teke - Japan Jetway is the world's third largest manufacturer of automatic transmission design, established in 1943, was originally Nissan AT / CVT (automatic transmission / continuously variable transmission) division, and later in 1999 from Nissan independent, has merged Mitsubishi AT / CVT Division, became the world's third largest automatic gearbox design manufacturer. Jie Teke's main products for the CVT CVT, the main application of the car manufacturers have Nissan, Mitsubishi, Mazda, jeep and so on. 4, Gatrak - Germany Founded in 1935 and headquartered in Cologne, Germany, Gatrak offers a wide range of transmission products H Beam Rods for the world, including manual transmissions, dual-clutch transmissions and their hybrid upgrades, as well as electric drive drives. Now Gatrak, including Audi, Ford, GM, BMW, Suzuki, including dozens of car manufacturers to provide transmission products.