Gears
- It is a positive drive and the velocity ratio remains constant.
- The center distance between the shafts is relatively small, which results in compact construction.
- It can transmit very large power, which is beyond the range of belt or chain drives.
- It can transmit motion at very low velocity, which is not possible with the belt drives.
- The efficiency of gear drives is very high, even up to 99 per cent in case of spur gears.
- A provision can be made in the gearbox for gear shifting, thus changing the velocity ratio over a wide range.
Gear drives are, however, costly and their maintenance cost is also higher. The manufacturing processes for gears are complicated and highly specialized. Gear drives require careful attention for lubrication and cleanliness. They also require precise alignment of the shafts.
