Power transmission is the movement of energy from its place of generation to a location where it is applied to performing useful work and gear is a component within a transmission device that transmits the rotational force to another gear or device
The gears are a type of mechanical element whose teeth are cut around a cylindrical or conical surface with the same space. Gears are used for the rotation and transmission of force from the driveshaft to the driven shaft when coupling a pair of elements. The gears can be classified into spiral, cycloid and trochoidal gears according to their shape. They are also classified as parallel shaft gear, transverse shaft gear, and non-parallel and non-transverse shaft gear depending on the position of the shaft.
There are different types of gear like Helical Gear, Spur Gear, Herringbone gears, Bevel Gear, Rack and pinion, and Worm Gear. Helical Gear is cylindrical gears that are used with parallel shafts similar to the spur gears and have winding teeth. Having a better teeth grip than spur gears, they generate less noise and can carry higher loads, which makes them suitable for high-speed applications.
Some of the applications where Helical Gears are used are in the Fertilizer industries, Printing industries, Earthmoving Industries, Rolling Mill, Power and Port Industries, Textile Industries, Plastic Industries, Automobile Gearboxes, and Machine Tool Gearboxes. Helical Gear is used in transmitting torques between parallel or non-parallel shafts, they are not as noisy as spur gears.
The teeth on helical gears are cut at an angle to the face of the gear. This gradual engagement makes helical gears operate much more smoothly and quietly than spur gears. One advantage of helical gears is that if the angles of the gear teeth are correct, they can be mounted on perpendicular shafts, adjusting the rotation angle by 90 degrees.
Herringbone gears are two helical gears of opposite hand e mounted side by side to avoid axial thrust so as to cancel resulting thrust forces. Herringbone gears are mostly used on heavy machinery. Rack and pinion is used to convert rotation (From the pinion) into linear motion (of the rack). The steering systems on many cars use these gears.
Bevel gears are useful when the direction of a shaft’s rotation needs to be changed. They are usually mounted on shafts that are 90 degrees apart but can be designed to work at other angles as well. The teeth on bevel gears can be straight, spiral, or hypoid. They are used in locomotives, marine applications, automobiles, printing presses, cooling towers, power plants, steel plants, railway track inspection machines, etc.
Worm gears are used when large gear reductions are needed. It is common for worm gears to have reductions of 20:1, and even up to 300:1 or greater. An interesting property is that the worm can easily turn the gear, but the gear cannot turn the worm. Worm gears are used widely in material handling and transportation machinery, machine tools, automobiles, etc
Spur Gears are used in transmitting torque between parallel shafts. The teeth are parallel to the axis of rotation. They transmit power from one shaft to another parallel shaft. Some of the applications where spur gears are used are an electric screwdriver, oscillating sprinkler, windup alarm clock, washing machine, and clothes dryer.
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