1) High transmission accuracy. As mentioned earlier, belt transmission cannot guarantee an accurate transmission ratio, and chain transmission cannot achieve a constant instantaneous transmission ratio. However, the transmission ratio of modern involute gears is theoretically accurate and constant. This is not only a key requirement for precision machinery and instruments, but also an important condition for reducing dynamic loads and achieving smooth transmission under high-speed and heavy loads.
2) Wide application range. The transmission power range of gear transmission is extremely wide, which can be from 0.001 watts to 60,000 kilowatts; the circumferential speed can be very low, and can also be as high as 150 meters per second, which is difficult to compare with belt transmission and chain transmission.
3) It can realize the transmission between any two shafts in spaces such as parallel shafts, intersecting shafts, and staggered shafts, which is also impossible with belt transmission and chain transmission.
4) Reliable work and long service life.
5) The transmission efficiency is relatively high, generally 0.94～0.99.
6) The manufacturing and installation requirements are high, so the cost is also high.
7) The requirements for environmental conditions are strict. Except for a few low speed and low precision situations, it is generally required to be placed in the box cover to prevent dust and scale, and it is also necessary to pay attention to lubrication.
8) It is not suitable for transmission between two shafts that are far apart.
9) Vibration damping and impact resistance are not as good as belt drives and other flexible drives.
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