1. Reasons for the “Flickering†cause When the four-wheeled agricultural vehicle brakes in an emergency, the wheels are quickly locked, turning to slide, and the movement resistance increases dramatically. An inertia force acting on the center of mass of the vehicle body and the frictional resistance between the wheel and the road surface form a pair of couples. The force couple causes the body to produce the forward turning tendency of the contact point between the previous wheel and the road as the fulcrum, resulting in the increase of the ground pressure of the front wheel and the rear Wheel ground pressure is reduced, so the rear wheel and the ground friction resistance will be less than the front wheel. In this way, the rear wheels and the forward taxiing are constrained by the front wheels, while the sideslip can be freed from the constraints of the front row. Under inertial force, as long as the left and right wheels are slightly stressed (if the road surface adhesion coefficient is different, the braking effect of the right and left wheels is inconsistent, the loading of the cargo is too biased, the direction of the liquid cargo rushes, and the vehicle is turning and thus subjected to centrifugal force when braking. The role, etc., will easily make the rear wheel 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." 2. "Flickering tail" prevention through the above analysis shows that "drift tail" should have two basic conditions, that is, wheel locking and sufficient inertia 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 flicker". In addition, the vehicle's braking performance is not good (such as unilateral braking, rear wheel locking before the front wheel), cargo material is too biased, the direction of the liquid cargo surging and the vehicle is turning when the brakes are "drift." Inducing factors. Therefore, in practice, the following points should be paid attention to in order to prevent “flickerâ€. (1) Try to avoid emergency braking. Different road conditions, the adhesion coefficient is different, the braking distance is very different. Therefore, 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 in front. If there are obstacles, it is necessary to take measures to reduce the speed in advance. Especially in the case of slippery roads such as muddy, ice and snow, where the roads on both sides of the road are not the same, cornering or loading of liquid cargo is easily induced, the emergency brake cannot be easily used. (2) Correct operation during emergency braking. When forced to make an emergency brake, the body of the driver should be closely watched during the braking. After feeling the rear wheels to slide, the braking force is immediately reduced (not completely relaxed), the wheels are released from the locked state, and the sideslips are generally eliminated. After elimination, increase the braking force. Stay tight until it is completely parked. Theory and practice have proved that when the wheel is in the critical state of locking and non-locking, the braking effect is the best, and the wheel is still in a rolling state, and it is not easy to skid; at the same time, the front wheel still has a good guiding effect. The position of the body is corrected at any time with the steering wheel, thus effectively preventing the "tail flicking". The "ABS" system (automatic anti-lock braking system) that has been widely used in mid- and high-end cars is to make the brake wheels in a critical state of locking and non-locking. (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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