GEARS
Power is transmitted from one shaft to another with gear drives when
1 . When distances are very short
2 . When the shaft at low speed
3 . Always a positive drive
4 . There is a need a set up and set down of speed
5 . Transmitted high torque
6 . Time is required
Gears layout are at very compact level .And its provide a highly efficient and reliable service .
TYPES OF GEARS
1 . SPUR GEAR
It is a cylindrical gear whose tooth teeth are parallel to gear axis . The spear gear are used to transmitting motion between two shafts whose axis are parallel and coplanar .
2 . HELICAL GEAR
It is a cylindrical gear whose tooth traces are straight helices , teeth are inclined at an angle to gear axis . The double helical gear are the equivalent of two helical gears .
The helical gears are used in automobiles gear boxes .
3 . BEVEL GEAR
The bevels gears are used to connect two shafts whose axis are coplanar but intersecting . When bevel gears have their teeth inclined to the face of bevel it is called helical bevel gears .
4 . SPIRAL GEAR
These are identical to helical gear with the difference that these gear have a point contact rather than a line contact . These gears are used when the connections is to be made between intersecting and co-Coplanar shaft .





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