Why can t a rear wheel drive car move at all on a snowy day?

Let's be in principle:

The basis of car handling and safety is tire adhesion, which is used for three main purposes: to provide driving force, braking force, and lateral force.

The adhesion of each car is limited, and the adhesion needs to provide lateral force and driving force or braking force at the same time, that is to say, when you drive or brake to spend most of the adhesion, the lateral force that can be provided will be reduced, and it is easy to lose laterally. That's why the car tends to slip out of control when braking or refueling in corners.

There are three types of loss of lateral attachment ability, front wheel slippage, rear wheel slippage, and four-wheel slippage. Slippage of the front wheels will lose the ability to steer understeer, and slippage of the rear wheels will cause the yaw to lose control, and the situation of four-wheel slippage is more complicated. Rear wheel slippage is a much more dangerous condition than front wheel slippage.

Therefore, when the driving wheel is the rear wheel, the rear wheel should provide both driving force and lateral force, and the lateral force that the rear wheel can provide is relatively small, so the rear wheel is easy to slip and the vehicle is out of control. That's why rear-wheel drive cars are more dangerous on ice and snow.

Many factors will affect adhesion, the biggest factor is the ground, the ice and snow road surface can provide very little adhesion, at this time the rear wheels need to provide driving force at the same time, the lateral force is very small, very easy to slide.

So in order to avoid the loss of control of the snow and ice road, it is necessary to try to provide enough lateral force, that is, try not to let the drive and brake spend most of the adhesion, that is:

On the other hand, it is necessary to provide as much adhesion as possible, and the most important thing is snow tires or snow chains, which are very, very, very important equipment.

Also, be sure to buy a car with an ESP, this critical moment.

It's life-saving.

Because snow has resistance, and car tires are easy to slip after a snowy day.

This is because the road surface is slippery on snowy days, and the friction is less, and its rear wheeler is very skidding.

Because the road is slippery on a snowy day, the tires of the rear-wheel drive are likely to slip, so it is difficult to move.

Because the tires are built, it is very difficult for him to walk on snowy days, and it is very easy to slip.

Because rear-wheel drive vehicles are particularly prone to slippage when it is snowy, it is more dangerous.

Because it mainly relies on the power of the rear wheels, it is easy to make the car slip on snowy days.

On snowy days, the rear wheels are particularly prone to slippage, which is dangerous.

The front two wheels of the rear-wheel drive car have no power, and the road is slippery in snow, so it is even more difficult to walk.

I don't think it's likely, it's just a rear-wheel drive car, it's just a little less controllable.

Rear-drive snow days are more likely to slip.

It is better to walk on a flat road in a snowy day, because the engine and gearbox are pressed in front of the front, so the adhesion of the front wheels is a little larger, so as to avoid skidding. However, if there is a lot of snow on the road, or the road surface is icy, the front-wheel drive vehicle will also skid.

Rear-wheel drive vehicles feel more comfortable to drive on dry roads, but because the rear of the rear-wheel drive car is lighter, the adhesion is not as great as that of the front-wheel drive car. However, it is even more slippery on snowy days. Snow chains can be installed on snowy days, so that whether it is a rear-wheel drive or front-wheel drive car, it can effectively avoid skidding.

Introduction to front and rear drive:

The so-called drive mode refers to the arrangement of the engine and the number and position of the drive wheels. The average car has two rows of wheels, front and rear, in which the wheels that are directly driven by the engine to rotate and thus push (or pull) the car forward are the driving wheels. According to the number of drive wheels, it can be divided into two categories: two-wheel drive and four-wheel drive.

According to the position of the engine in the car and the position of the driving wheels, two-wheel drive is divided into four forms: front-rear-wheel drive (FR), front-wheel drive (FF), rear-wheel drive (RR), and mid-rear-wheel drive (MR). Four-wheel drive can be divided into four drive modes: full-time, part-time, real-time and mixed four-wheel drive.

At present, the most commonly used drive modes in sedans are front-wheel drive, front-rear wheel drive and full-time four-wheel drive.

Reason: The driving wheels of rear-wheel drive cars are the rear wheels, and the image is understood to "push" the car to run, and this form of drive is mostly used in luxury cars, such as BMW, Mercedes-Benz and Audi cars. Rear-wheel drive models push the car forward, which means that the weight of the car is concentrated in the front, and the power comes from the rear wheels.

Then when the friction between the weight of the car and the ground is greater than the forward propulsion provided by the rear wheels, the vehicle cannot move forward at all. When the road is slippery in snow, the propulsion provided by the rear wheels is more likely to be less than the friction between the weight of the car and the ground, so it leads to the phenomenon of skidding.

Driving in snow: 1. For smooth roads in snowy days, if it is an automatic transmission model, you need to make use of idle start. After releasing the brakes, the engine is idle to let the car drive slowly, and then lightly press the accelerator pedal to start the car slowly.

2. If the rear wheel is stuck in the snow and the idle speed cannot let the car move, it will be slowly fueled, and as long as the car has a slight forward speed, stabilize the throttle until the vehicle can drive normally.

3. If the rear wheel slips, stop the oil supply immediately, release the accelerator, step on the brake, do not let the car come back to slip back, pour back a little, and then try to start.

4. Furthermore, brake in snowy weather, be sure to step on the brakes slowly, do the brakes early, and the braking process should be carried out slowly, first step on the brakes shallowly, keep a while, and then slowly step on the brakes until the body stops.

And Kiki this snowy day, do you know why? If you're a two-wheel drive punishment, it's definitely going to be able to drive, and if it's not loaded and unloaded, he'll feel like it's going to be more slippery, so try to go out less on snowy days.

When the front wheel drives, it is to pull the car forward, the longitudinal force of the rear wheel is small, according to the attached ellipse, the lateral force that the rear wheel can bear is relatively large, and it is not easy to produce side slip; When the rear wheel drive, the front wheel is only responsible for steering, and the longitudinal force of the rear wheel is larger, and the attachment ellipse is known, and the lateral force it can withstand is reduced, which is easy to produce side slip! (It's not easy to hit by hand, haha, the landlord has a heart!) ）

Difference Between Push and Pull.

Reasons why rear-wheel drive cars are difficult to drive on snowy days:

1. The engine of the rear-wheel drive car is usually in the front, resulting in the body part of the driving wheel being too light. When the re-torque is large, it is easy to cause the phenomenon of slippage and idling.

2. The steering mechanism of the rear-wheel drive vehicle is in the front wheel, which is easy to cause side slip and tail flick when the rear wheel slips or brakes.

Winter rear drive car skidding, the reason is that the starting throttle is too strong, plus the rear of the car is light, can not hold down the wheels, if you carry people, try to let the other party sit in the back, in addition to the snow tires, when starting to be one gear higher than the summer start, so that the speed of the car is not enough, there will be shaking, but the advantage is that the vehicle starts without strength, no energy to start slowly, and it will not slip, remember not to give a lot of oil, sharp turns, slow into the corner, less oil out of the corner. In the northern winter, you see how all those small breads are opened, and they are also running on the avenue.

The 1st floor is explained correctly, then it should be better to add snow chains.