A gear is a rotating machine part having cut teeth, which mesh with another toothed part to transmit torque. Geared devices can change the speed, torque, and direction of a power source.
Types of gears
Short answer:
Parallel Axes / Spur Gear, Helical Gear, Gear Rack, Internal Gear.Intersecting Axes / Miter Gear, Straight Bevel Gear, Spiral Bevel Gear.Nonparallel, Nonintersecting Axes / Screw Gear, Worm, Worm Gear (Worm Wheel)Others / Involute Spline Shaft and Bushing, Gear Coupling, Pawl and Ratchet
Parallel Axis Gear
In spur gears, the edge of each tooth is parallel to the axis of rotation and they mesh together when they are fitted to parallel shafts.
Helical Gear
The leading edges of the teeth are not parallel to the axis of rotation, but are set at an angle.
Advantages of the helical gear. Silent operation: In a helical gear train, the teeth engage a little at a time rather than the entire face at once. This causes less noisy power transfer in case of helical gears
Efficiency of helical gear is less because helical gear trains have sliding contacts between the teeth which in turns produce axial thrust of gear shafts and generate more heat.
Double helical gear
A herringbone gear, a specific type of double helical gear, is a special type of gear that is a side to side (not face to face) combination of two helical gears of opposite hands
Like helical gears, they have the advantage of transferring power smoothly because more than two teeth will be in mesh at any moment in time. Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half.
Spiral bevel gear
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Int. Intersecting Perpendicular Axis Gears
Bevele gears are gears where the axes of the two shaft's intersect and the tooth-bearing faces of the gear's themselves are conically shaped.
A spiral bevel gear is a bevel gear with helical The main application of this is in a vehicle differential, where the direction of drive from the drive shaft must be turned 90 degrees to drive the wheels.
M . meter gear
Mmetre gears are bevel gears has the same nomber of teeth on mating gears and with perpendicular axes specially used for 1:1 gear ratio.
W
Nonparallel and Nonintersecting Axis Gears.
A worm gear (or worm drive) is a specific gear composition in which a screw (worm) meshes with a gear/wheel similar to a spur gear. The set-up allows the user to determine rotational speed and also allows for higher torque to be transmitted.
A r .
ack and pinion is a type of linear actuator that comprises a pair of gears which convert rotational motion into linear motion.
The flat, toothed part is the rack and the gear is the pinion.
In spur gears, the edge of each tooth is parallel to the axis of rotation and they mesh together when they are fitted to parallel shafts.
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