Why are large trucks front wheel guided and rear wheel driven, but small cars are front wheel driven

Generally speaking, 100% of large trucks are front wheels are guide wheels, which are mainly used to change direction, and the rear wheels push the front wheels forward. The car is the opposite, but the front wheel pulls the rear wheel, and more importantly, it is also the guide wheel, which also plays the role of changing direction.

Most family cars are front-wheel drive, but some less expensive cars are rear-wheel drive. In fact, there is a big difference between the front drive and the rear drive. Generally, the front-wheel drive engine is horizontal, and the horizontal engine is installed in front of the front axle, so that most of the weight is concentrated in the front.

Rear-wheel drive engines are usually mounted vertically so that the engine can be placed further back so that the weight distribution between the front and rear of the car will be more balanced.

Front wheel drive function:

1.Reduce the weight of the car.

2.Increase interior space.

Rear-wheel drive function:

1.Improve the balance and handling of the car.

2.Easy to maintain.

3.Lack of traction.

4.The power generated by the engine is transmitted through the propeller shaft to the rear axle, resulting in a loss of output power.

Not all sedans are front-wheel drive.

There are three types of drive for sedans: front-wheel drive (FF), front-rear-wheel drive (FR) and all-wheel drive (4WD). The so-called front-wheel drive refers to the drive form of front-mounted engine and front-wheel drive.

This is a form of drive that has only really emerged and been technically perfected after the 1970s, and most of the current small and medium-sized cars use this form of drive. The front-wheel drive integrates the transmission and the drive axle, which is fixed next to the engine and transmits power directly to the front-wheel drive vehicle.

Front-wheel drive refers to the drive form of front-mounted engine and rear-wheel drive. This is a traditional form of drive, and the Cadillac CTS is a typical front-rear-wheel drive sedan. In this form of drive, the front wheels are responsible for the steering task, and the rear wheels are responsible for the driving work.

The power output by the engine is transmitted to the rear drive axle through the clutch, transmission, and propeller shaft, which drives the rear wheels to move the car forward, and in figurative terms, "pushes" the vehicle forward.

The four-wheel drive method was originally mainly used for off-road vehicles, but now it is also popularized in some cars, most notably some Subaru and Audi models. Four-wheel drive is further divided into four modes: full-time four-wheel drive (full-time), part-time four-wheel drive (part-time), real-time four-wheel drive (real-time) and part-time hybrid four-wheel drive.

For example, the Audi A43 0 and A6L4 2 use the qua tro is a full-time four-wheel drive; In general, off-road vehicles and SUVs are most commonly used to be four-wheel drive, which can switch between two-wheel drive and four-wheel drive through a joystick or button according to road conditions; Timely four-wheel drive is controlled by the computer, and it is two-wheel drive on the normal road surface, and becomes four-wheel drive when the abnormal road surface or the driving wheel is slipping; Timing Timing 4WD can be freely selected according to the driver's preference.

From the aspect of vehicle handling and safety, the center of the engine and drive shaft of the front-wheel drive car is in the front of the vehicle, and the driving wheel is also in the two front wheels, so when cornering, the center of gravity of the front part is forward due to inertia, and it is easy to break through the ground adhesion of the front wheels, resulting in understeer, commonly known as "pushing the head". The rear-wheel drive car is more average than the front-wheel drive car in the center of the vehicle, and it can generally reach the optimal ratio of 50 50, and the limit value of cornering is higher, however, because the front wheel of the car is directly dominated by the steering system has changed the direction of travel, and the driving wheel behind still has the inertia to move forward, so it is easy to oversteer, commonly known as "tail flicking". Four-wheel drive is a more balanced drive that avoids understeer and oversteer, but because the engine torque is distributed to the front and rear wheels, some power is sacrificed and it is more fuel-intensive.

Generally, cars are front-wheel drive, with a simpler structure, low cost, and good driving stability. Generally, high-end sedans will appear rear-wheel drive and four-wheel drive models.

Due to the terrain and weather in China, as well as the cost, almost all domestically produced cars in China are in the form of FF (front-wheel drive). At present, the cheapest rear-drive sedan in China is FAW Toyota's Ruizhi.

Hello! In the past, there were many rear-wheel drive cars, and now more than 80% of two-wheel drive vehicles are front-wheel drive, that is, front-wheel drive.

Generally, cars are front-wheel-drive, but if the front wheels get stuck in the mud, they can't get out. That's why 4WD (front and rear drive) appeared.

It should be a rear drive, so that you can get along when you get stuck in the mud, and the front drive will be very troublesome.

Rear-wheel drive vehicles steer more easily than front-wheel drive vehicles. Since it is front-wheel drive, the force on both front wheels is the same, and it takes a lot of force to make it change direction when changing direction. The driving wheels of the rear-wheel drive car do not affect the change of direction of the front wheels in the rear, so the rear-wheel drive car can be maneuverable flexibly and can be used as you like without the power steering assist system.

Today's front-wheel drive vehicles are generally equipped with power steering assistance systems to solve the problem of poor handling.

The advantages of a front-wheel drive car in the case of the same displacement are:

The effective output kinetic energy is high, the fuel consumption is low, the power is strong, the volume is small, the interior space is large, the vehicle is lightweight, the structure is compact, the failure rate is low, and the driving speed is high.

Disadvantages of front-wheel drive cars: (This is exactly what you want to know).

Complex structure, high machining accuracy, high manufacturing cost, high maintenance process requirements, poor bearing capacity, poor control performance and other shortcomings.

These advantages and disadvantages of the front-wheel drive car determine that it is used in small cars with high needs and large space needs.

The advantages of a rear-wheel drive car are:

It has the advantages of good bearing capacity, simple structure, convenient maintenance and good control performance.

The disadvantages of rear-wheel drive cars are:

Large volume, high quality, high and slow driving speed, high fuel consumption, high failure rate and other shortcomings.

Therefore, rear-wheel drive vehicles are only used for large and medium-sized freight and passenger vehicles with large volume and large cargo capacity.

First, to save costs. Because rear-wheel drive cars need to have a propeller shaft, front-wheel drive cars do without a propeller shaft. Therefore, the cost of a front-wheel drive car is lower than that of a rear-wheel drive car.

Second, rear-wheel drive cars will have a raised part in the rear of the car, which will affect the space in the rear.

Thirdly, front-wheel drive is easier to drive than rear-wheel drive, and it's not about the pleasure of handling.

Fourth, technology is also a reason.