Many of mechanical slightly capably friends all know that, in all kinds of machinery, gear's role is very big, like a nail in a building, it seems to be its volume is very small, is didn't make effect on the building, but once it is damaged, then it is likely that they will bring a series of chain reaction, and we often see gear common items, have an alarm clock, watches, and various kinds of comparison precision instruments contain gear. And as long as you are more careful to look at the gear, you will find that their number of teeth are a certain number, not random single digit, not dozens of as many, usually no less than 17. Many friends will be puzzled, why there is such a regulation?
In order to ensure a very good transmission effect between the two gears, generally speaking, the teeth of the gears are not too few, otherwise, problems will occur in the connection process. Only when the connection between the two is smooth can the machine run smoothly. Between the gear and gear meshing, and also requires precise measurements, the tilted Angle between them, they ate, and two gears mesh with each other when operating pressure, after a very detailed calculation, finally the results and the index if too little, its roots will elimination part of this approach is called the root cutting. But there is a condition that if the cut part is small, then the strength and stability of the gear will be greatly reduced.
Although a gear may still work if it has fewer words, if it has only 17 teeth, then one of the points on the gear may get uniform force because it is an extra part. After all, 17 is a prime number. And if insisted on using the number of teeth gear, then each round may produce some error, and a 17 tooth wear may be very serious, if may be managed to remain in the short term, but once the wear conditions for a long time, then it is likely to cause the damage of the gear, resulting in destruction of the whole machine.