The automatic mixer is mainly used in engineering construction, and its working environment is generally poor, such as dust, uneven road and so on. In such a bad environment, the impact on the mixer is very big, such as the tires of the mixer. The uneven road will accelerate the wear of the tires. Some mixer drivers reflect that the eccentric wear of the tires is serious, Especially the front wheels.

很多人认为搅拌车轮胎的偏磨是车轮的外倾角超差造成的，但其实轮胎的偏磨在很大程度上是因前束值的超差造成的，根据从事四轮定位工作多年的技术人员总结的经验和大量的定位检测数据分析认为：正确的前束值完全可以有效的避免轮胎的偏磨。

Many people think that the eccentric wear of the mixer tire is caused by the out of tolerance of the camber angle of the wheel, but in fact, the eccentric wear of the tire is largely caused by the out of tolerance of the toe in value. According to the experience summarized by the technicians who have been engaged in four-wheel alignment for many years and the analysis of a large number of positioning detection data, it is believed that the correct toe in value can effectively avoid the eccentric wear of the tire.

还有一种轮胎偏磨是转向轮总转角的超差、车轮外倾角和主销倾角的不正确导致的，搅拌车在实际的行驶中，大多数是直线行驶的，转弯、倒车和掉头时的总转角的时间不多，所以由此引发的偏磨比较少。

There is also a kind of tire eccentric wear, which is caused by the out of tolerance of the total angle of the steering wheel, the incorrect camber angle and kingpin angle. In the actual driving of the mixer, most of them drive in a straight line, and the time of the total angle when turning, reversing and turning around is not much, so the eccentric wear caused by this is less.

搅拌车轮胎与地面接触时的柔韧性和随意变形的特性很大程度上抵消了因车轮外倾角可能造成的轮胎偏磨，即便是高压轮胎超差的车轮外倾角对轮胎的磨损影响也不大，有很多的厢式货车在空车的时候为了减少轮胎与地面的摩擦、降低滚动阻力而专门设计了可变后轮外倾角。

The flexibility and random deformation of the mixer tire in contact with the ground largely offset the tire eccentric wear caused by the wheel camber angle. Even the wheel camber angle of the high-pressure tire has little effect on the tire wear. There are many van type trucks in order to reduce the friction between the tire and the ground when they are empty Variable rear wheel camber is specially designed to reduce rolling resistance.

从设计上考虑，为了约束搅拌车在直线行驶中车轮外倾角造成的轮胎偏磨，对搅拌车设定了一定的前束值，由于搅拌车行驶不同的路面情况和颠簸、冲撞、机件磨损等因素的存在，即使是坚固的搅拌车，它原有的定位角度都要不同程度的因上述原因逐渐改变原前束值。有的数值一发生变化，在行驶过程中就能感觉到，比如主销后倾角、车轮外倾角、比较严重的后轮前束值的改变。

Considering from the design, in order to restrain the tire eccentric wear caused by the camber angle of the wheel in the straight-line driving of the mixer, a certain toe in value is set for the mixer. Due to the different road conditions and the existence of factors such as bumping, collision and parts wear, even for the solid mixer, Its original positioning angle should be changed gradually due to the above reasons. As soon as some values change, you can feel them during driving, such as kingpin caster angle, wheel camber angle, more serious rear wheel toe in value change.

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