This article will focus on the placement and placement of the engine in the car body design, and its structural arrangement will be discussed to give you a clearer understanding of the car architecture. Front wheel drive Front-engine front-wheel drive car drive system, which we usually call FF. In addition to some high-performance sports cars, the cars we see on the street today usually use front-engines. why? Obviously, placing the engine in the front of the car can increase the interior of the car and make the ride more comfortable, so as long as it is not for the pursuit of high performance, the supercar looks like a car with a front engine or a SUV. And what are the benefits of using front-loading? The front drive structure, the power of the engine is directly transmitted to the front wheel, so there is no need for a drive shaft to transport power from the front to the back, so that there is no protrusion in the center of the interior floor of the compartment, which increases the leg space. Moreover, the front engine can be placed horizontally on the front of the vehicle, and the gearbox and the differential can be integrated into one body. Compared with the rear wheel drive, the manufacturing technology is relatively simple, and the parts used are also small, which can also reduce the manufacture of the automobile. cost. The dynamic safety of the front-wheel drive vehicle is higher than that of the rear-wheel drive. The stability of the front-wheel drive vehicle in the straight road is better. The most common example is the comparison of the general driver in the case of high-speed cornering. It can adapt and deal with the understeer of the front-wheel drive vehicle, because the front-wheel drive car will produce a pusher at high-speed cornering. At this time, the driver will reduce the turning angle of the car as long as the throttle is decelerated, so that the car returns. Going to the turning route, however, for the oversteer of the rear-wheel drive car, unless it is a professional driver, the chance of accidents will be much greater than that of the front-wheel drive car. Another advantage of the FF is that the engine's crankshaft is in line with the drive shaft, which reduces the engine's power output to the wheel, increases efficiency, and helps reduce unnecessary losses. However, if the front-engine front-wheel-drive car concentrates the driving and steering functions on the front wheel of the car, in a car with a large power output, the torque steering will easily occur. What is the torque steering? It is the torsion force generated near the steering shaft. The position of the steering shaft is away from the center of the wheel. When the car turns to the left or right, the “friction area†is transferred to the front and the back of each side. A "torque condition", this torsion condition will affect the handling of the car. Also, when the car starts, the center of gravity will usually move backwards, so that the tail will be lighter, the driving ability of the driving wheel (that is, the front wheel) will decrease, and the situation of vacant ground will be wasted, so the power will be wasted. The car that was not able to start driving was fast. Another problem is the weight of the car, because the front-wheel drive car concentrates the engine, gearbox, differential, and drive shaft on the front of the car, which makes the weight of the car body uneven, and the car's dynamics are difficult to get very good. Balance. 2. Rear wheel drive Front-engine rear-wheel drive car drive system, which we usually call FR. Obviously, this kind of driving car needs to have a long drive shaft, and the power output from the engine at the front of the car is transmitted to the driving wheel, that is, the rear wheel. Thus, for a general car, like a van, the body is relatively high. Because the drive shaft is placed under the chassis of the car; for the car, in order to maintain the characteristics of the low chassis, the drive shaft has to be pushed into the car, sacrificing the internal space for comfort. Another problem is that with a long drive shaft, it also consumes a part of the power itself, which is a disadvantage of FR cars. The advantages of FR are also obvious. It is easier to balance the front and rear axles in the weight distribution of the body. Although the engine is above the front axle, the gearbox is already behind the front axle, and the rear axle has a differential. Key components such as the tail (ie, the tail teeth), so it is easier to achieve the balance of the whole vehicle than MR, RR, FF. Alfa Romeo's 75 has tried to balance the weight of the front and rear axles by placing the gearbox and the differential on the rear axle. As we said in the previous section, when the car is started, the center of gravity will naturally move backwards, so that the drive wheel is behind, it will be better than the front-wheel drive. Although the engine is placed on the front of the car, the center of gravity will move backwards when accelerating, so the center of gravity returns to the rear axle of the drive wheel, so that the start and acceleration are much faster. At the same time, the FR car's track will be stronger than the FF car, because the FR car's power output is in the rear wheel, the steering is controlled in the front wheel, both of which do their jobs, there will be no FF car's torque steering problem. When turning and accelerating at the same time, FF will be more prone to understeer. The engine of a car can be placed two behind the passengers, behind the rear axle or behind the rear axle. The difference between the two is not obvious. It can be distinguished by their name, which is usually the MR we say. Set the engine and RR post engine. The manufacturers of various super sports cars in the world use the engine rear-mounted technology. One of the purposes of this is that the car can be designed according to the designer's design idea, which can create a unique shape of the car, and the other is to directly press the weight of the car. On the drive shaft. Generally, when the FF car accelerates at the start, the adhesion of the front wheel will decrease due to the backward movement of the center of gravity. As a result, the front wheel will rotate in place, and the slow start will not waste power, and the MR and RR are starting. At that time, the center of gravity moves backwards, so that the downward pressure applied to the rear axle increases, that is, the friction between the rear wheel and the ground increases, so that the situation of the rear wheel idling is effectively overcome, and if the rear wheel idling, idling Only the center of gravity will be moved back further, which will quickly stop the rear wheel from spinning. In actual driving, there are two situations in which the idling of the tire affects the transmission of power: starting and exiting. The driver of the FF car is the most troublesome for these two situations. One is that the power is continuously output from the engine, but the car is spinning in place, and when the corner is out, the inner tire is mad, but it wants to accelerate but does not respond. For the MR and RR cars, the driver only needs to kick the throttle, the car will fly forward according to your thoughts, and can withstand much larger engine power than the FF car, when you drive a horse with more than 250 horsepower When you are in the car, you will feel that the car is starting to become uncontrollable, so for the super sports car that pursues horsepower and speed, the best choice for MR and RR. Take the only RR car Porsche 911 on the market as an example. The officially announced front-to-rear weight ratio is 39:61, which is almost equal to a reverse FF car, while the MR car has a more uniform weight ratio. The Porsche Boxster is 46: 54, Ferrari's 360 Modena is 43:57. Although some car manufacturers appreciate that FR cars can achieve a 50:50 car weight ratio, and control is also more convenient, but from the acceleration point of view, it is the most advantageous for MR and RR with light weight and tail weight. Possibly small, the sports car will have a narrow head and wide body design and a relatively large rear wheel. Receptacle Wall Plate,Electrical Outlet Covers,Electrical Outlet Cover Plates,Wall Plates For Outlets Lishui Trimone Electrical Technology Co., Ltd , https://www.3gracegfci.com