Machine Design
Gears
Gear drives offer following advantages over the chain or belt drives:
(1) It is a positive drive and the velocity ratio remains constant.
(2) The center distance between the shafts is relatively small, which results in Compact construction.
(3) It can transmit very large power which is beyond the range of belt or chain drives.
(4) It can transmit motion at very low velocity which is not possible with the belt drives.
(5) The efficiency of gear drives is very high up to 99% in case of spur gear.
(6) A provision can be made in the gearbox for the gear shifting, by just changing the velocity ratio over a wide range.
Disadvantages :
(1) The gear drives are costly and the maintenance cost is also very high.
(2) The manufacturing process for gears are complicated and highly specialized.
(3) Gear drives require careful attention for lubrication and cleanliness.
(4) Gear drives also requires precise alignment of the shaft.
(1) The gear drives are costly and the maintenance cost is also very high.
(2) The manufacturing process for gears are complicated and highly specialized.
(3) Gear drives require careful attention for lubrication and cleanliness.
(4) Gear drives also requires precise alignment of the shaft.
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