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A gear is a rotating circular machine component with cut teeth that mesh with another toothed part to transfer (convert) torque and speed.
- They are utilized to transfer rotations and power from the driving shaft to the determined shaft when a couple of these components have fit.
- The basic concept behind gear operation is very similar to the basic principle behind lever operation.
- Geared devices can change the torque, speed, and direction of the power source.
- The historical backdrop of gears is old & is referenced by Archimedes to be being used in antiquated Greece in B.C.
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Internal Gear
These pinion wheels have teeth cut within part of cylinders and cones and are utilized to combine with outer cogwheels.
- These are utilized in couplings of shafts which are of planetary gear drives and gear types.
- Because of managing issues and impedance, for example, involute and trochoid, there lies one disservice with this type of gear: a varying number of inside and outside gears.
The video below explains this:
Types of Gears Detailed Video Explanation:
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Helical Gear
These winding tooth-lined gears are cylindrical in form, and it can communicate high loads and is exceptionally calm. They are of two sorts, to be specific right-hand and left-hand turn (twist).
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Mitre Gear
It is a sort of bevel gear, having a speed ratio of one (1). Spiral and straight are the two types of mitre gears, and these have the capability of changing the power transmission's direction without affecting the speed.
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Spur Gear
It is a gear having a cylindrical configuration with teeth parallel to the shafts aligned straight. The accuracy rate is high, and the production is easy.
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Worm Gear
These types of gear have two components, namely worm, and worm wheels. The worm is a screw-shaped cut shaft, whereas the mating gear is the worm wheel. Different types of materials are used, which reduces the friction when the surface slides and comes in contact. The worm wheel is made up of soft material, and the worm is composed of hard material.
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Bevel Gear
The pitch surface of the bevel is in a cone shape, having teeth along the cone side. These are utilized to transfer force between 2 shafts. They are ordered into hypoid gears, helical bevels, zero bevels, angular bevels, straight bevels, and miter.
Screw Gear
It comprises the same hand helical cogwheels in a point of 45 degrees on the non-parallel and non-crossing (intersecting) shafts. It is utilized for little power transmission and when utilized, it requires consideration of its grease.
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Gear Rack
It is a round and hollow formed gear, having the range of infinite pitch. In the event that it networks with a pinion wheel which is of round and hollow shape, it can change over rotational movement into direct movement. There are two kinds of gear rack, namely helical tooth and straight racks.
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Spiral Bevel Gear
These are type of bevel gears, having teeth in curved lines. They have more prominent effectiveness and are robust yet it creates more vibration and commotion.
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Things to Remember
- There are three major tooth shapes: cycloid shape, trochoid shape, and involute shape.
- The advantages of gears are: Long-lasting, Transmission certainty, Minimum power loss, Accuracy in the angular speed ratio
- The parallel and intersecting shaft has a high efficiency of transmission, whereas the offset shaft, i.e., non-parallel, has a relatively lower rate of transmission.
- The precision class of the gear decides the accuracy of the type of gear.
- The standard set by DIN, ISO, AGMA, JIS, etc., is followed by a precision class to measure the accuracy rate.
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Sample Questions
Ques. In which industry does spur, helical, and worm gears are used? (2 Marks)
Ans. These are the following industries where spur, helical and worm gears are used:
Both the bevel gear and helical gear are used in the same kind of industries, and these are cement, forest, mining, beverage, marine, energy, food, managing bulky materials, etc.
The same is the case of spur and worm gear; they also share a similarity in terms of industries. These industries include food, unit handling, beverage, energy, forest, and automotive.
Ques. What is Gears? (2 Marks)
Ans. A gear is a machine component with teeth cut around a round and hollow or cone-shaped surface with corresponding dispersing.
Ques. What are the types of gears? (2 Marks)
Ans. The following are the types of gear
- Spiral bevel gear
- Internal gear
- Bevel gear
- Spur gear
- Worm gear
- Gear rack
- Screw gear
- Helical gear
- Mitre gear.
Ques. What is spur gear? (2 Marks)
Ans. The spur gear is a form of cylindrical gear having a straight and parallel tooth line to the shaft.
Ques. What are the types of helical gear? (2 Marks)
Ans. The different types of helical gears are
- Right-hand twist gear
- Left-hand twist gear
Ques. What are mitre gears? (2 Marks)
Ans. Mitre gears, which have a speed ratio of one, are one type of bevel gear. Mitre gears are used to shift the power transmission direction without affecting the speed.
Ques. What is a Gear rack? (2 Marks)
Ans. A gear rack is a cylindrically formed gear with an infinite pitch radius. It can transform rotational motion into linear motion if it meshes with a cylindrical gear pinion. Straight and helical tooth racks are the two types of gear racks.
Ques. What is Bevel gear? (2 Marks)
Ans. The pitch surface of a bevel gear is shaped like a cone, and the teeth are cut along the cone. This is used to transfer force between two shafts. Helical bevel, straight bevel, angular bevel, zero bevel, mitre, and hypoid gears are the many types.
Ques. What are the applications of spur gears? (2 Marks)
Ans. The spur gears are extensively used in food, beverage, forest, automotive, unit handling, and energy-producing industries. Hence, these types of gears are used in pumps, railways, clocks, trains, power plants, watering systems, power plants, washing machines, and clothes drying machines. Moreover, they can be helpful in material holding systems, household equipment, aircraft, and aerospace.
Ques. Explain the mechanism of gear in increasing the speed. (2 Marks)
Ans. Pinion wheels upgrade the speed by their components.
Two pinion wheels or gears, one having a larger number of teeth compared to the other or it's a greater estimated wheel when associated together, make the subsequent one turn round a lot quicker to keep up. So this course of action makes the subsequent wheel turns quicker than the first; however, with less power. An outfitting change produces a recognizable variation on the automobile or appliance. Trading in taller back gears assists with accomplishing some top-end pace, making the movement of the vehicle quicker.
Ques. Name the most commonly used type of gear. (2 Marks)
Ans. There are majorly three most commonly used gears, namely:
Spur gear: The cog appearing gear, having straight teeth are the most commonly recognized and used gear.
Worm gear: the common usage of the worm gear is found in mining devices, presses, and rolling mills.
Bevel gear: The cone-structured gear, which has outward teeth, is available in different kinds like straight, hypoid, and spiral bevel gear.
Ques. Are there any rustproof gears available? (2 Marks)
Ans. There are two types of gears that display rustproof properties; these are plastic gears and stainless steel gears. The metal gear and plastic gear meshing are recommended. Also, when plastic gear meshes with another plastic gear, it absorbs the moisture and emits heat or reflects dimensional variations. Hence, plastic gears are convenient to use in the presence or absence of lubrication.
Ques. What are the parameters on which precision class value depends? (2 Marks)
Ans. In order to check the accuracy of the gears, the precision grades are calculated. The measuring scale ranges from 0-12, where o stands for the highest accuracy and 12 for the lowest one. However, there are certain parameters to calculate the errors in the gear; these are:
- Radial jump
- Tooth direction
- Tooth shape
Ques. How to calculate mechanical advantage? (2 Marks)
Ans. Pinion wheels work on the guideline of mechanical advantage. It is the proportion of output power to enter power in a framework. With respect to gears, the proportion of the last gear's speed to the starting pace in a pinion wheel train is called gear ratio, giving the mechanical benefit. The mechanical benefit is proportional to speed proportion.
Stuff proportion = last gear's speed/starting gear's speed
Likewise, Gear proportion = Driving gear teeth's number/driven gear teeth's number
For instance, gear proportion = 10/40
=0.25
Subsequently, the mechanical advantage becomes 4.
Ques. What are the functions of gear drive or gearbox? (2 Marks)
Ans. A gearbox is a type of mechanical machine, which helps in changing the speed of the vehicle’s motor or increasing the output torque. It has majorly 3 functions; these are as follows:
- Increasing torque/force from the driving motor (equipment) to the driven motor (equipment).
- Reduces generation of speed by the appliance motor.
- Changing rotational shaft direction.
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