Gear drives(Advantages and Disadvantages)

Introduction:

Gear is the toothed wheel that transmits power and motion from one shafts to another shafts (by means of engagement between them).

      Gear drives are used in drives where constant velocity ratio is required as well as large power transmission is need of the drive. However, gear drives are costly because manufacturing process is complicated. They also require proper lubrication, cleaning, shaft alignment, space, etc.

       Advantages of Gear drives:

(a) Gear drive does not slip.

(b) It is positive drive.

(c) It is used to transmit very large power.

(d) The efficiency of transmission of gear drive is high, up-to 99%.

(e) Low velocity transmission is also possible in case of gear drives.

(f) Changing a velocity ratio can be possible by arranging different gears in mesh as in case of gear box.

(g) No requirement of tension adjustment as in case of belt drive.

       Disadvantages of Gear drives: 

(a) Gears need lubrication for smooth running.

(b) Cost of gear drive is more as compared to other drives.

(c) Manufacturing process of gears is complicated.

(d) Gear operation may be noisy.

(e) Gears require perfect alignment of the shafts.