इस बुक Rukmini ITI Trade Theory Vol 1&2 hindi PDF को RRB ALP and Technician इस Book मे FITTER / TURNER / WELDER / MACHINIST, DIESEL . We are not owner of the any PDF Material/Books/Notes/Articles. I.T.I. Fitter Hindi is a practice application for I.T.I Fitter Students. It contains some multiple choice questions of trade theory. Students can practice with this app on. Fitter- Sem 3 - Trade Throry - Hindi - NSQF Level 5 Fitter Trade Theory - 2 Year (Hindi) Fitter - Sem 1 - Trade Theory - Hindi - NSQF Level 5.
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Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Learn how your comment data is processed. They utilize curved teeth for efficient, high capacity power transmission. This offers reduced pulsation due to which they are highly used for extrusion and polymerization. Herringbone gears are mostly used on heavy machinery.
Rack and pinion Rack and pinion gears are used to convert rotation From the pinion into linear motion of the rack.
A perfect example of this is the steering system on many cars. The steering wheel rotates a gear which engages the rack.
As the gear turns, it slides the rack either to the right or left, depending on which way you turn the wheel. Rack and pinion gears are also used in some scales to turn the dial that displays your weight.
Straight Bevel Gear 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. Straight bevel gear teeth actually have the same problem as straight spur gear teeth as each tooth engages, it impacts the corresponding tooth all at once.
These spiral teeth engage just like helical teeth: the contact starts at one end of the gear and progressively spreads across the whole tooth. If you were to extend the two shafts past the gears, they would intersect The bevel gear has many diverse applications such as locomotives, marine applications, automobiles, printing presses, cooling towers, power plants, steel plants, railway track inspection machines, etc.
The steering wheel rotates a gear which engages the rack. As the gear turns, it slides the rack either to the right or left, depending on which way you turn the wheel. Rack and pinion gears are also used in some scales to turn the dial that displays your weight. Straight Bevel Gear 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.
Straight bevel gear teeth actually have the same problem as. These spiral teeth engage just like helical teeth: If you were to extend the two shafts past the gears, they would intersect The bevel gear has many diverse applications such as locomotives, marine applications, automobiles, printing presses, cooling towers, power plants, steel plants, railway track inspection machines, etc. It is common for worm gears to have reductions of Many worm gears have an interesting property that no other gear set has: This is because the angle on the worm is so shallow that when the gear tries to spin it, the friction between the gear and the worm holds the worm in place.
One other very interesting usage of worm gears is in the Torsen differential, which is used on some high-performance cars and trucks.
They are used in right-angle or skew shaft drives. The presence of sliding action in the system even though results in quieter operation, it gives rise to considerable frictional heat, hence they need good lubrication for heat dissipation and for improving the efficiency. High reductions are possible which results in compact drive. A right section of the pitch surface. The radial distance between the pitch circle and the addendum circle. The radial distance between the pitch circle and the root circle.
That part of the tooth surface lying outside the pitch surface. The part of the tooth surface lying inside the pitch surface. The width of a tooth and a space, measured on the pitch circle. The circular pitch, therefore, equals the pitch circumference divided by the number of teeth.
The diametral pitch is, by definition, the number of teeth divided by the pitch diameter. The pitch diameter is usually specified in inches or millimeters; in the former case the module is the inverse of diametral pitch. The small radius that connects the profile of a tooth to the root circle.
The point of tangency of the pitch circles of a pair of mating gears. The line tangent to the pitch circle at the pitch point. The path traced by the contact point of a pair of tooth profiles. It is also the angle between the line of action and the common tangent. One gear is a driver, which has d1, N1, 1 as diameter, speed and angular speed respectively. Another gear is driven connected to the driven shaft has d2, N2 ,2 as diameter, speed angular speed respectively.
It reduces speed and increases torque. To create large gear ratio, gears are connected together to form gear trains. Electric motors are used with the gear systems to reduce the speed and increase the torque.
Electric motor is connected to the driving end of each train and is mounted on the test platform. The output end of the gear train is connected to a large magnetic particle brake that is used to measure the output torque. Types of gear trains 1. Simple gear train 2. Compound gear train 3. Planetary gear train Simple Gear Train The most common of the gear train is the gear pair connecting parallel shafts.
The teeth of this type can be spur, helical or herringbone. The angular velocity is simply the reverse of the tooth ratio. The main limitation of a simple gear train is that the maximum speed change ratio is For larger ratio, large sizes of gear trains are required. The sprockets and chain in the bicycle is an example of simple gear train.
When the paddle is pushed, the front gear is turned and that meshes with the links in the chain. The chain moves and meshes with the links in the rear gear that is attached to the rear wheel. This enables the bicycle to move.
Simple and compound gear trains Compound Gear Train For large velocities, compound arrangement is preferred.
Two keys are keyed to a single shaft. A double reduction train can be arranged to have its input and output shafts in a line, by choosing equal center distance for gears and pinions. Two or more gears may rotate about a single axis Planetary Gear Train Epicyclic Gear Train Planetary gears solve the following problem. Let's say you want a gear ratio of 6: One way to create that ratio is with the following three-gear train: Planetary Gear Train In this train, the blue gear has six times the diameter of the yellow gear giving a 6: The size of the red gear is not important because it is just there to reverse the direction of rotation so that the blue and yellow gears turn the same way.
However, imagine that you want the axis of the output gear to be the same as. A common place where this same-axis capability is needed is in an electric screwdriver.
In that case, you can use a planetary gear system, as shown here: Planetary Gear Train In this gear system, the yellow gear the sun engages all three red gears the planets simultaneously.