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轿车的轴荷随着乘客人数、行李质量、制动时车速及道路情况(如坡度)的变化而变化,因此,轿车前、后轮与路面间的附着力F_φ也随之变化。由于地面制动力的极限值就是车轮与路面间的附着力,且当制动器制动力达到该附着力时,车轮即被抱死而使轿车失去制动时的方向稳定性,因此,要求给轿车前、后轮提供的制动器制动力能随轴荷的变化而作相应的改变。只有这样,轿车才有较高的制动效能及良好的制动时的方向稳定性。显然,采用固定的轴间(前、后轮)制动力分配是不能满足上述要求的。若在制动管路中安装感
The axle load of the car varies with the number of passengers, the quality of the luggage, the speed of the vehicle when braking, and the road conditions (such as the gradient of the road). Therefore, the adhesion F_φ between the front and rear wheels of the car also changes. Since the limit value of the ground braking force is the adhesion between the wheel and the road surface, and when the braking force of the brake reaches the adhesion force, the wheel is locked and the car loses its direction stability during braking. Therefore, The braking force provided by the rear wheel can be changed correspondingly with the change of shaft load. Only in this way, the car has a higher braking efficiency and good direction stability when braking. Obviously, the use of fixed shaft (front and rear wheel) brake force distribution can not meet the above requirements. If the brake pipe installation sense