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Transmission gear refers to a device that transmits motion and power by a gear pair. It is the most widely used mechanical transmission method in various modern equipment. It has relatively accurate transmission, high efficiency, compact structure, reliable operation and long service life.


Among various transmission forms, gear transmission is the most widely used in modern machinery. This is because the gear transmission has the following characteristics:

1) High transmission precision. As mentioned earlier, the belt drive cannot guarantee an accurate transmission ratio, and the chain drive cannot achieve a constant instantaneous transmission ratio, but the transmission ratio of the involute gears commonly used in modern times 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 load and achieving smooth transmission under high-speed and heavy-load conditions.

2) Wide application range. The power range transmitted by the gear drive is extremely wide, from 0.001W to 60000kW; the peripheral speed can be very low, or as high as 150m/s, which is difficult to compare with the belt drive and the chain drive.

3) It can realize the transmission between any two axes in the space of parallel axis, intersecting axis, staggered axis, etc., which is also impossible for belt drive and chain drive.

4) Reliable work and long service life.

5) The transmission efficiency is high, generally 0.94 to 0.99.

6) The manufacturing and installation requirements are higher, so the cost is also higher.

7) The requirements for environmental conditions are strict. Except for a few low-speed and low-precision cases, it is generally necessary to place it 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 reduction and impact resistance are not as good as flexible transmission such as belt transmission.


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