The basic function of the car driveline is to transmit the power from the engine to the drive wheels of the car, generating a driving force that allows the car to travel at a certain speed. The vehicle drive train has the functions of deceleration, shifting, reversing, interrupting power, inter-wheel differential and inter-axle differential. It works well with the engine to ensure the normal running of the car under various working conditions and has good power. And economic. The automotive transmission system is divided into mechanical, hydraulic and electric. This article describes the layout of these three types of automotive drive trains and their advantages and disadvantages. This article refers to the address: http:// Arrangement of automobile powertrain and its advantages and disadvantages First, the layout of the mechanical drive train FR: front rear drive - engine front and rear wheel drive Mainly used in trucks, some cars and buses also have applications. Advantages: It is convenient to repair the engine, the control mechanism of the clutch and the transmission is simple, and the axle load distribution of the front and rear wheels is reasonable. Disadvantages: A longer drive shaft is required, which not only increases the overall vehicle quality, but also affects the efficiency of the automotive transmission system. Applications: Trucks, some cars and buses. Such as Hongqi 7560, Guangzhou logo, Volga, Duke of Nissan, Toyota Crown, Toyota Lexus and so on. FF: Front Front Drive - Engine Front, Front Wheel Drive Widely used in micro and medium-sized cars, the use of mid- to high-class cars is also increasing. Advantages: the universal joint between the transmission and the drive axle in the FR and the drive shaft are eliminated, which reduces the height of the underbody and helps to improve ride comfort and stability at high speeds; since the entire drive train is concentrated in the front of the car, Its operating mechanism is relatively simple. Disadvantages: The structure is more complicated; the front tire has a shorter life; the climbing ability is relatively poor. RR: Rear rear drive - engine rear and rear wheel drive This type of arrangement is often used on large and medium passenger cars. Advantages: The front and rear axles are easy to obtain a reasonable axle load distribution; the interior noise is low, the space utilization rate is high, and the luggage compartment is large. Disadvantages: The engine cooling and cooling conditions are poor, and some faults during driving are not easily noticed by the driver. Long-distance manipulation also complicates the steering mechanism and makes maintenance adjustment inconvenient. Applications: Micro and mid-size sedan (widely used), mid- to high-end and premium sedan (increasing applications). It adopts the engine front longitudinal and front-wheel drive transmission system layouts, such as FAW Audi, Shanghai Santana, Tianjin Xiali and other cars. It adopts the front-mounted, front-wheel drive transmission system arrangement of the engine, such as Ford Discovery, Toyota Karena, Toyota Selika, Toyota Camry, Nissan Maxima, Honda Accord and other cars. All-wheel drive nWD Originated from military vehicles, mainly used in off-road vehicles and some sedan cars A transfer case is required after the gearbox to transmit power to all of the wheels. Rear-wheel drive MR solution for engine The engine is placed in the middle of the car and driven by the rear wheels. The use of racing cars and some large and medium-sized passenger cars is conducive to achieving an ideal axle load distribution for the front and rear axles. For passenger cars, the highest utilization rate of the effective area of ​​the passenger compartment can be obtained. Second, the hydraulic transmission system layout Hydraulic drive trains are divided into hydrodynamic and hydrostatic. Hydrodynamic type: The use of a liquid medium to transmit power during a cyclical flow of flow between an active element and a driven element. It is characterized by a combination of hydraulic transmission and mechanical transmission, and a hydraulic transmission in series with a stepped mechanical transmission. Disadvantages: complex structure, high cost, low mechanical efficiency, mainly used in mid- to high-class cars and some heavy-duty trucks Hydrostatic type: Also known as positive displacement hydraulic transmission, the energy is transmitted through the change of static pressure energy of the liquid transmission medium. It is mainly composed of an engine-driven oil pump, a hydraulic motor and a control device. Its high cost and short service life are used on some military vehicles. Third, the electric drive train layout The engine drives the generator to generate electricity, and the drive axle is driven by the motor or the drive wheel with the reducer is directly driven by the motor. The composition and arrangement are similar to those of hydrostatic. Advantages: from the engine to the wheel by electrical connections, the overall layout of the car can be flexible; with stepless shifting characteristics; start and shift smooth. Disadvantages: high quality, low efficiency, consumption of more colored metal copper. The vehicle drive train (automobile drive train structure) is located between the engine and the drive wheels, which allows the power output from the engine to be guaranteed for the car to travel normally. The most common is the mechanical drive train, which is used on large passenger cars, high-class cars and all types of construction vehicles. Electric power transmission is relatively rare and is only used on large mining vehicles. CNC machining refers to the machining with computer numerical control machining tools. Usually refers to precision machining, CNC machining lathe, CNC machining milling machine, CNC machining boring and milling machine and so on. The CNC has the advantages of high production efficiency, stable processing quality, high processing precision, high repetition precision and the like in the case of a large number of varieties and small batch production. 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