First, the reasons for the "drift"

When the four-wheeled agricultural vehicle is in emergency braking, the ground pressure of the front wheel increases, and the ground pressure of the rear wheel decreases, so the friction resistance between the rear wheel and the ground will be less than the front wheel. Under the effect of inertial force, as long as the right and left wheels are subject to slight uneven force, it is very easy for the rear wheels to produce side slip. At this time, the locked front wheel has lost its guiding effect, and the steering wheel cannot be used to correct the position of the car body. Once the rear wheel skid is formed, the inertia force deviates from the force line of the front wheel resistance to form a horizontal surface moment, and this The torque increases with the increase of the side slip; the increase of the torque also promotes the increase of the side slip. The result of such a vicious cycle is that it causes the tail of the vehicle to generate violent swinging movements and form a "drift."

Second, the "flick tail" prevention

From the above analysis, it can be seen that the “tail flick” should have two basic conditions, namely wheel locking and sufficient inertial force. The size of the inertial force required to form a "tail flicker" is closely related to the adhesion coefficient of the road surface. The greater the adhesion coefficient, the smaller the inertial force required for the "tail flicking". In addition, the poor braking performance of the vehicle (such as unilateral braking, rear wheel locking before the front wheel), cargo center too biased, directional surge of liquid cargo, and turning of the vehicle during braking are all “flick tail”. Inducing factors. Therefore, the following points should be noted to prevent “flicker”.

1. Try to avoid emergency braking

In order to avoid emergency braking, when driving, it is necessary to strictly control the speed of the vehicle and maintain a sufficient distance from the vehicle ahead according to the road conditions. In case of obstacles, deceleration measures must be taken in advance. Especially in the case of muddy, ice and snow running on wet roads, where the roads on both sides of the road are different, turning or loading of liquid cargoes, etc. can easily induce side slip, emergency braking cannot be easily used.

2. Correct operation during emergency braking

When forced to emergency brake, the body of the vehicle should be closely watched during the braking. After feeling the rear wheels to slide, the braking force should be reduced immediately to allow the wheels to move out of the locked state. Generally, the sideslip can be eliminated, and the system can be increased after the sideslip is eliminated. power. Stay tight until it is completely parked.

3. Correctly adjust the brake system.

When adjusting the braking system, it should be ensured that the four wheels lock at the same time and the braking torques of the left and right wheels are the same, preventing the rear wheels from locking and braking, and the braking system is in a good technical state. In addition, pay attention to the same type of tire on both sides, the same pattern depth and tire pressure and so on.

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