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Why can't gears have less than 17 teeth? What happens if they are less?
Release time:
2018-12-07
Gear is a kind of spare parts widely used in life, whether it is aviation, cargo ship, automobile, etc. will be used. However, when designing and processing gears, the number of gears is required. If the number is less than 17, it cannot be rotated. Do you know why?
Gear is a kind of spare parts widely used in life, whether it is aviation, cargo ship, automobile, etc. will be used. However, when designing and processing gears, the number of gears is required. If the number is less than 17, it cannot be rotated. Do you know why?
First of all, the gear can rotate because the upper gear and the lower gear must form a good transmission relationship. Only when the connection between the two is in place, its operation can be a stable relationship. Take the involute gear as an example. Only when the two gears mesh well can it play its role. Specifically, it is divided into two types: spur gears and helical cylindrical gears.
The standard spur gear has a coefficient of tooth top height of one, a coefficient of tooth heel height of 1.25, and its pressure angle should reach 20 degrees. If the tooth germ and the cutter are like two gears during gear processing.
If the number of teeth of the embryo is less than a specific value, the root of the tooth root will be excavated, which is called root cutting. If the root cutting is small, the strength and stability of the gear will be affected. What we are talking about here is 17 for gears. If we don't talk about the working efficiency of gears, it will work and run no matter how many teeth it has.
In addition, seventeen is a prime number, that is to say, the number of coincidences between a tooth of a gear and other gears is the least under a certain number of turns, and the force will not be at this point for a long time. Gears are precision instruments. Although errors will occur on each gear, the probability of axle wear is too high, so if it is 17, it will be OK for a short period of time, but not for a long period of time.
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