Most of our common vehicles are equipped with four wheels and two rows of axles, in which the driving wheels are used to drive the vehicles forward.
Generally speaking, the driving form of automobile mainly refers to the number and position of driving wheels. According to this basic standard, the way to drive a car with front wheels is called front drive, and the way to drive a car with rear wheels is called rear drive, both of which belong to two-wheel drive.
If all wheels participate in driving, it is called four-wheel drive, but it can be divided into full-time four-wheel drive, part-time four-wheel drive and timely four-wheel drive according to different working modes.
Extended data:
According to the layout of the car:
1, precursor (FF):
This is the most common mode of family car, that is, the engine is set in front of the front axle and driven by the front wheel. At present, most family cars adopt this drive form. The engine and gearbox are horizontally placed in the engine compartment, and the power is directly transmitted to the front wheels through two half shafts.
2. Front and rear drive (right front):
The engine is arranged in front of the front axle. In this layout, the engine and gearbox will be arranged in two ways. They are horizontal and vertical respectively. Both of these arrangements need to drive the rear wheel through the transmission shaft. The front wheel is responsible for steering and the rear wheel is responsible for driving.
However, the vertical layout is more direct in transmitting power, while the driving force of the horizontal layout will be turned through gears, so the loss is relatively greater.
3. Center rear drive (MR):
In this layout, the engine is arranged between the front and rear axle, and the rear wheel is driven by the transmission shaft. If subdivided, it can also be divided into front center and rear center, in which the engine between the front axle and the passenger compartment is called front center, while the engine between the passenger compartment and the rear axle is called rear center.
Its advantages are uniform axle load distribution and more neutral driving characteristics, but this layout will occupy a lot of space in the passenger compartment, so it is more suitable for performance vehicles.
4. Rear drive (right rear):
As the name implies, its engine is placed behind the rear axle, and its main weight is opposite to that of the front drive, and it is completely pressed on the rear wheel. Now there are not many family cars with this layout, and more of them appear on public transport.
At present, only supercars like Porsche 9 1 1 insist on this layout. Its advantage is that it maintains the characteristics of rear drive, but its structure is compact, and it does not need a transmission shaft to transmit power. However, its shortcomings are similar to those of the predecessor. The pressure on the rear wheel is greater, and the center of rotation is closer to the rear, which requires excellent adjustment to achieve better control.
Baidu Encyclopedia-Drive Mode