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A reverted gear train is very similar to a compound gear train. They are both used when there is only a small space between the input and output shafts and large changes in speed or power are needed. There are two major differences between compound and reverted gear trains. First, the input and output shafts of a reverted train must be on the same axis (in a straight line with one another). Second, the distance between the centers of the two gears in each pair must be the same.

Like a compound gear train, planetary trains are used when a large change in speed or power is needed across a small distance. There are four different ways that a planetary train can be hooked up. A planetary gear train is a little more complex than other types of gear trains. In a planetary train at least one of the gears must revolve around another gear in the gear train. A planetary gear train is very much like our own solar system, and that's how it gets its name. In the solar system the planets revolve around the sun. Gravity holds them all together. In a planetary gear train the sun gear is at the center. A planet gear revolves around the sun gear. The system is held together by the planet carrier. In some planetary trains, more than one planet gear rotates around the sun gear. The system is then held together by an arm connecting the planet gears in combination with a ring gear. The planetary gear set is the device that produces different gear ratios through the same set of...

Simple Gear Train- The simple gear train is used where there is a large distance to be covered between the input shaft and the output shaft. Each gear in a simple gear train is mounted on its own shaft. When examining simple gear trains, it is necessaryto decide whether the output gear will turn faster, slower, or the same speed as the input gear. The circumference (distance around the outside edge) of these two gears will determine their relative speeds. Suppose the input gear's circumference is larger than the output gear's circumference. The output gear will turn faster than the input gear. On the other hand, the input gear's circumference could be smaller than the output gear's circumference. In this case the output gear would turn more slowly than the input gear. If the input and output gears are exactly the same size, they will turn at the same speed. In many simple gear trains there are several gears between the input gear and the output gear. These middle gears ...

A   gear train   is formed by mounting   gears   on a frame so that the teeth of the gears engage. Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping; this provides a smooth transmission of rotation from one gear to the next. •     A gear train is two or more gear working together by meshing their teeth and turning each other in a system to generate power and speed •       It reduces speed and increases torque •      Electric motors are used with the gear systems to reduce the speed and increase the torque Types of gear train §   Simple gear train §   Compound gear train §   Epicyclic gear train §   Reverted gear train

First....What is torque?: Torque is a twisting force- (it doesn't do any 'work' itself- it is simple an application of energy).   Work (or 'stuff') happens, when torque is applied and movement occurs. "Torque is a force that tends to rotate or turn things. You generate a torque any time you apply a force using a wrench. Tightening the lug nuts on your wheels is a good example. When you use a wrench, you apply a force to the handle. This force creates a torque on the lug nut, which tends to turn the lug nut.   English units of torque are pound-inches or pound-feet; the SI unit is the Newton-meter. Notice that the torque units contain a distance and a force. To calculate the torque, you just multiply the force by the distance from the center. In the case of lug nuts, if the wrench is a foot long, and you put 200 pounds of force on it, you are generating 200 pound-feet of torque. If you use a two-foot wrench, you only need to put 100 pounds of force on it to gen...

The   gear ratio   of a   gear train   is the ratio of the angular velocity of the input gear to the angular velocity of the output gear, also known as the   speed ratio   of the gear train.   The gear ratio can be computed directly from the numbers of teeth of the various gears that engage to form the gear train. In simple words, gear ratio defines the relationship between multiple gears. Gear Ratio= Output gear # teeth / Input gear # teeth For example, if our motor is attached to a gear with 60 teeth and this gear is then attached to a gear with 20 teeth that drives a wheel, our gear ratio is 60:20, or more accurately 3:1 If you do not want to count a gears teeth (or if they do not exist), gear ratio's can also be determined by measuring the distance between the center of each gear to the point of contact.   For example, if our motor is attached to a gear with a 1" diameter and this gear is connected to a gear with a 2" diameter attached to a wh...

The gear ratio tells us how fast one gear is rotating when compared to another. If our input gear (10 teeth) is rotating at 5 rpms , and it is connected to our output gear (50 teeth), our output gear will rotate at 1 rpms.   Why? Our gear ratio is 50:10... or 5:1 If our small gear rotates 1x, our large gear only rotates 1/5. It takes 5 rotations of our small gear to = 1 rotation of our large gear. Thus our large gear is rotating at 1/5 the speed = 1rmp.   What if our gear ratio where 1:3 ? In this case our input gear is 3x larger as large as our output gear.   If our input gear were rotating at 20rmps.... each rotation, would result in 3 rotations of our output gear. Our output would be 60rpms.

Use of Gears- To reverse the direction of rotation To increase or decrease the speed of rotation To move rotational motion to a different axis To keep the rotation of two axis synchronized Advantages of Teeth- They prevent slippage between the gears - therefore axles connected by gears are always synchronized exactly with one another. They make it possible to determine exact gear ratios - you just count the number of teeth in the two gears and divide. So if one gear has 60 teeth and another has 20, the gear ratio when these two gears are connected together is 3:1. They make it so that slight imperfections in the actual diameter and circumference of two gears don't matter. The gear ratio is controlled by the number of teeth even if the diameters are a bit off.

Pitch surface  : The surface of the imaginary rolling cylinder (cone, etc.) that the toothed gear may be considered to replace. Pitch circle : A right section of the pitch surface. Addendum circle : A circle bounding the ends of the teeth, in a right section of the gear. Root (or dedendum) circle : The circle bounding the spaces between the teeth, in a right section of the gear. Addendum : The radial distance between the pitch circle and the addendum circle. Dedendum : The radial distance between the pitch circle and the root circle. Clearance : The difference between the dedendum of one gear and the addendum of the mating gear. Face of a tooth : That part of the tooth surface lying outside the pitch surface. Flank of a tooth : The part of the tooth surface lying inside the pitch surface. Circular thickness  (also called the  tooth thickness ) : The thickness of the tooth measured on the pitch circle. It is the length of a...

Spur Gear Helical Gear Herringbone Gear Bevel Gear Worm Gear Rack and Pinion Internal and External Gear Face Gear Sprcokets     1)  Spur Gear - Parallel and co-planer shafts connected by gears are called spur gears. The arrangement is called spur gearing. Spur gears have straight teeth and are parallel to the axis of the wheel. Spur gears are the most common type of gears. The advantages of spur gears are their simplicity in design, economy of manufacture and maintenance, and absence of end thrust. They impose only radial loads on the bearings. Spur gears are known as slow speed gears. If noise is not a serious design problem, spur gears can be used at almost any speed. 2)       Helical Gear - Helical gears have their teeth inclined to the axis of the shafts in the form of a helix, hence the name helical gears. These gears are usually thought of as high speed gears. Helical gears can take higher loads than similarly sized spur gears. The motion o...

1)       Number of teeth 2)       Form of teeth 3)       Size of teeth 4)       Face width of teeth 5)       Style and dimension of gear blank 6)       Design of the hub of the gear 7)       Degree of precision required 8)       Means of attaching the gear to the shaft 9)       Means of locating the gear axially to the shaft