Rear-wheel drive cars are expensive. Generally, cars are front drive. Generally, it is the rear wheel drive of BMW Mercedes-Benz vehicles. Why tens of thousands of Wuling vans

Front and rear drive (FR) is called front engine rear wheel drive, which is a more traditional drive form. The front wheel is responsible for steering and the rear wheel is responsible for driving the whole vehicle. In this driving form, all the power output by the engine is transferred to the rear drive axle to drive the rear wheel, so that the car can move forward. That is to say, in actual driving, the rear wheel "pushes" the front wheel to drive the vehicle forward.

Compared with other driving forms of two-wheel drive, front-rear drive has great advantages. When the vehicle starts, accelerates or climbs on a good road, the adhesion pressure of the driving wheel increases, and the traction force is obviously better than that of the predecessor. At the same time, the front and rear drive vehicles also have good handling stability and ride comfort, which is conducive to prolonging the service life of tires. In addition, the arrangement of front and rear drive makes the engine, clutch and transmission of the vehicle close to the cab, which simplifies the arrangement of the control mechanism and the structure of the steering mechanism and is more convenient for the maintenance and repair of the vehicle.

The front-wheel drive system is also the most widely used today. First of all, it can reduce the cost of the car, which is why many car manufacturers adopt this drive system today. Front wheel drive (FWD) is much cheaper to manufacture and install than rear wheel drive (RWD). It doesn't pass through the transmission shaft under the cockpit, and it doesn't need to make the rear axle housing. The transmission and differential are assembled in one housing, so fewer parts are needed. This front-wheel drive system can also make it easier for designers to install other components on the bottom of the car, such as braking system, fuel supply system and exhaust system.

Reducing the vehicle weight is another advantage of front-wheel drive. Reducing vehicle weight can improve acceleration, braking and fuel economy. Because the driving wheel of the front-wheel drive vehicle bears the weight of the engine and the driving axle, it can increase the adhesion of the driving wheel, which will be of great help for the vehicle to drive on the wet road.

The biggest advantage of front-wheel drive is that it can have a lot of indoor space, and the cab will not be bumpy because the transmission shaft passes through. Look at the Honda Civic, and you will find that this kind of car can also have a lot of back seat space that cars can't match, because it has a flat bottom, and at the same time, without the rear differential, the space in the trunk will increase.

The main disadvantage of front-wheel drive is that it makes the handling of the car worse. Because most of the mass is concentrated in the front of the car, the rear end will become lighter, so the adhesion of the rear wheel will become smaller, and the rear end will easily slip when driving on the snow-covered road. But now this problem has been solved. The designer will set the weight at the rear of the car as much as possible. The ideal mass distribution is that the ratio of the front and rear wheels to bear the mass is 50:50, but front-wheel drive cars rarely reach or approach this ratio.

Another disadvantage is the load borne by the front wheels. The front wheel must transmit the force acting on the tire during acceleration, steering and braking. The adhesion of tires is limited. When part of the adhesion is used for acceleration, it will definitely reduce the stress on other parts. The force on the rear wheel is very small, and it only needs to roll with the front wheel.

The disadvantages of all front-wheel drive systems are the advantages of rear-wheel drive systems. With some mechanical parts moving from the front to the rear, the balance and maneuverability of the car will be greatly improved. When the rear-wheel drive car accelerates, the traction will not be sent by the front wheel, so the driver will feel more lateral grip and better handling performance when accelerating the turn. This is why high-speed sports cars and high-performance cars in the world are driven by rear wheels.

Low maintenance cost is also an advantage of rear-wheel drive, although this cost will vary greatly due to different structures and models. But if your transmission is broken, there is no need to repair the differential for a rear-wheel drive car, but a front-wheel drive car may need to be repaired because these two parts are made together. However, after decades of development, the reliability of front-wheel drive vehicles has also developed greatly, and the high maintenance cost may not be a big problem.

The disadvantages of rear wheel drive are also obvious, such as relatively high assembly and manufacturing costs, more faults, relatively narrow indoor space and so on. Nowadays, more and more cars adopt independent rear suspension system, so that designers can make the body closer to the differential and transmission shaft when designing, thus increasing indoor space.

Low traction has always been a problem for rear-wheel drive vehicles, because the load on the rear wheels is relatively small, but the current electronic equipment has changed this. Traction control system and body stability electronic system can make rear-wheel drive vehicles achieve the same performance as front-wheel drive vehicles on wet roads. Improved tire design technology can also improve this defect of rear-wheel drive vehicles.