 Spur Gear
| → Two shafts exist in parallel, but one gear interlocks inside another gear. |
| As there are many interlocking teeth, vibration is low but large reduction ratio cannot |
be obtained. This gear can be installed in a small space if used for planet gear.
Helical Gear
| → To prevent simultaneous interlocking of tooth stems creating during use of spur gear, |
| this gear has tooth stems with twisted curve shape. Helical gear shows low vibration |
| and noise as interlocking of teeth is softer than spur gear. Also, long contact wire |
| allows for transfer of large force and strength. It is more complicated to manufacture |
| than spur gear, and thrust is formed in the direction of shaft. This thrust can be |
resolved using thrust bearing. (Thrust bearing: withstands shaft load)
Double Helical Gear
| → Double helical gear removed thrust in the direction of shaft that occurs in general |
| helical gear. The use is similar to general helical gear. It is used for large sized and |
large capacity gears such as turbine on ships and large capacity reducers.
Straight Bevel Gear
| → This gear transfers force between two crossing shafts. Bevel gear interlocks in the |
| direction from tooth peak to tooth root, and it has lower contact rate compared to |
spiral bevel gear.
Spiral Bevel Gear
| → This bevel gear has tooth stems cut into shape of a spiral. |
| As length of interlocked part is long, it shows soft motion. Especially at high speed, |
| it can reduce vibration and noise. |
Therefore, this gear is more frequently used than straight bevel gear.
Worm Gear
| → This gear is used to transfer motion when two shafts are perpendicular instead of |
| being on the same plane. It is characterized by high reduction ratio, small installation |
| space and low gear efficiency. Also, it does not reverse worm in worm wheel, and this |
| trait is used to prevent reversal of winch. This gear is mainly used for reducers and |
craft machines.
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