As can be seen from the exposed pictures, the four wheels can rotate at a certain angle or even twist for 90 translation, which is similar to the universal wheel of an office chair. Friends who often park sideways must have felt that when the parking space is short, there is often an embarrassing phenomenon that either the front of the car can't stop or the rear of the car can't stop. We can only drive the car into the parking space by moving back and forth a little bit, which is time-consuming and laborious, and it is very easy to rub it. At this time, if the car can be translated, parking in the side direction becomes very simple.
Changing the rotation angle of the wheels is not only very convenient for parking, but also more conducive to the safe passage of vehicles in some crowded situations, at least without moving the rear of the car to the other side like the following owner:
In fact, the idea of changing the wheel rotation angle has a long history. For example, our common drift is a way to change the rotation angle of the wheel, but drift is to realize the 90-degree rotation of the driving direction by wearing the tire. If the tire changes from round to spherical, the drift will not rub the tire.
It's just that whether it's design difficulty or manufacturing difficulty, whether it's driving road condition or overall cost, spherical tires are strangled in the cradle, but not all car owners have drifting skills, and regardless of the city's car conditions, for some off-road vehicles driving on unpaved roads, the steering angle of the wheels can often affect whether they can get out of trouble safely.
When it comes to off-road, you have to mention the brand Jeep. As early as 2005, it launched a concept car called Hurricane. The biggest highlight of this car is that there are two different ways of wheel steering. One is that the front wheel and the rear wheel can rotate in the opposite direction at the same time, that is, the vehicle keeps the wheels rotating while turning in place, and the turning in place can be easily realized in narrow sections.
Another steering mode is that four wheels can rotate in the same direction at the same time, which means that the vehicle can walk sideways. For example, when we stop sideways as mentioned above, this steering mode can be fully opened so that the vehicle can easily enter the position. These steering modes are composed of two 335 horsepower HEMI? V8 engine, through the central transfer case and four transmission shafts, transmits power to four wheels respectively, so that each wheel can rotate independently.
In addition to Jeep, Chinese Express, a new domestic car-making force, also released similar vehicles, but not concept cars, but engineering prototypes; In addition, the four-wheel steering of Chinese express train is realized by hub motor, which requires a very large and complicated electronic control program. If the logic of the electronic control program is unclear and incomplete, this function will not only bring no convenience, but also bring great danger.
It is worth mentioning that the patent for tank steering applied by Toyota this time is also based on hub motor, combined with Toyota's first popularization of dual-engine technology in family cars. Does this mean that Toyota's technical reserves in the field of new energy may be deeper than we thought? Many independent car companies take Toyota as the benchmark, hoping that in terms of technical reserves, independent car companies can not lag behind.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.