In fact, this view is not completely incorrect.
At first, there was no differential in the transmission system of the car. Later, in order to enable the car to cope with various complicated road conditions such as rugged roads and bends, a differential was invented, so that two wheels on the same axle can run and operate normally at different speeds and distances.
However, although the common differential can meet the requirements of two wheels running at different speeds and distances, it also has a significant disadvantage. Because the ordinary differential itself has no locking mechanism, when a wheel slips and idles, the differential will transfer all the power to the idle side, which will aggravate the idle speed of the wheel. And a wheel with its own grip will lose power because of resistance, and then lose the ability to get out of trouble. In some rainy, wet and slippery conditions,
In order to solve this problem, LSD came into being, which evolved from ordinary differential to LSD with limited slip function. After the limited slip differential is added to the whole transmission system, one wheel can be prevented from slipping, and the other wheel can still effectively output power.
In the actual process of car use, when the vehicle passes through wet roads such as low-lying water, muddy rain and snow, and the two wheels are on different roads, it is very obvious that the wheels slip and the body swings abnormally. If the vehicle is equipped with LSD, it will obviously become much easier to deal with this complicated road condition.
The original intention of limited slip differential is to overcome the phenomenon of wheel slip and body side slip under various bad wet road conditions. But later, engineers found that vehicles with limited slip differential can play a higher control limit and run faster on the track, so limited slip differential has also been applied to various vehicles with performance as the selling point and used for intense driving. Because most high-performance cars are equipped with limited slip differential, many consumers mistakenly think that LSD has indirectly become high performance or high performance.
Limited slip differential can be divided into traditional Torsten limited slip differential and friction plate limited slip differential in structure. The purpose of these two kinds of limited slip differentials is to limit the limited slip of wheels. However, due to the differences in structure and performance, the application in different models is obviously different.
Because Audi's famous quattro four-wheel drive system is very famous, many people are familiar with the name Toson. Pure mechanical structure is sensitive, quiet and simple to maintain. Without special engine oil for maintenance, the power can be distributed to the left and right sides independently, which reduces the torque of the pulley, and at the same time transmits the power to another wheel, so that the engine power can be transmitted to the ground efficiently and continuously, which greatly improves the performance of various corners and avoids the objective situation brought by wheels under different road conditions to the greatest extent.
There is no such thing as 1way or 2way (explained later), but the locking efficiency brought by the mechanical structure. Because there is no intervention of engine oil and electronic system, power and torque can be distributed simply by mechanical parts according to the resistance of left and right wheels, which is very sensitive. Regarding the advantages of Torsten differential, it has a very significant advantage in rain, snow, mud, smooth roads or corners. Zero-time torque distribution of the mechanical part can easily solve all kinds of skidding phenomena, and there is no need to worry about tire idling and body side slip caused by excessive idling of the driving wheel due to wet road surface.
Automobile manufacturers will naturally not turn a blind eye to the advantages of Torsten limited slip differential, so many civilian models will be equipped with it, such as Audi Quattro four-wheel drive system equipped with mechanical Torsten differential, Subaru WRX? STI's DCCD four-wheel drive system and 86 and BRZ, which are currently playing hot in entry-level small sports cars, have applications. But manufacturers equip these models with LSD, the main purpose is to improve the safety performance of the car in the daily driving process, and the second is to improve the driving pleasure of the car itself.
Compared with Torsten limited slip differential, friction plate limited slip differential is difficult to be accepted by consumers. Friction plate limited slip differential is actually modified from ordinary differential, which can be matched according to the specifications of internal friction plates, thus forming different locking rates. Its working principle is also very simple. When the throttle is increased, the wheel speed difference will be converted into torque output. When the torque is large, the pressure of the disc gear shoe will be large, and the friction plates on both sides will be pressed more tightly, so that the friction plates can limit the sliding, ensure the torque distribution and make the wheel speed difference consistent.
Due to the difference between 1way (one-way) and 2-way (two-way), due to different designs, the applicable models are also different.
One-way 1 road limited slip differential is mainly suitable for front-wheel drive and four-wheel drive. The front wheel driven by the front wheel is not only responsible for power output, but also for steering. Therefore, in order to avoid the phenomenon of high-speed cart, the handling limit of front-wheel drive can be further improved by releasing the slip-limiting force of friction plate.
As for 2way (bidirectional type), it is much more sensitive than 1way (unidirectional type). As long as the left and right wheels slip, they will interfere with the work. Therefore, for the rear-wheel drive model that pays more attention to tail flick and drift, it is best to equip with 2Way. When the car body slips, it is sometimes necessary to control the locking efficiency of the tire by constantly retracting and releasing the accelerator, which will improve the driving pleasure and driving limit and reduce the danger of slipping out of control.
Friction plate limited slip differential benefits from structural advantages, diversified locking rate, convenient use, high locking rate in corners and high extreme driving pleasure. However, due to the high construction cost and maintenance cost, there will be harsh noise in the working process, and special LSD oil is needed for maintenance, so the friction plate limited slip differential is mostly used in racing cars.
In the domestic market, there are not many original models equipped with limited slip differential, but in the European market and the American market, the selection rate of LSD in the vehicle selection list is actually very high, which is also due to the rainy and snowy weather in Europe and America, and consumers in Europe and America pay more attention to the safe configuration of the car body.
But some people may ask, why don't domestic laws and regulations force manufacturers to install such good things?
For this, we should return to reality. Manufacturers need to consider the cost and expenses of the whole vehicle. Although this ignores the safety of driving, domestic consumers generally don't pay much attention to whether the vehicle is equipped with LSD.
If you really want to install a psychedelic drug in the future, it is actually unnecessary. After all, it is impossible for a family car to improve its handling by installing LSD.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.