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Sprocket
 
 
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A sprocket is a profiled wheel
Wheel

A wheel is a circular device that is capable of rotating on its axis, facilitating movement or transportation whilst supporting a load , or performing labour in machines....
 with teeth that meshes with a chain
Roller chain

Roller chain or bush roller chain is the type of chain most commonly used for transmission of Power_transmission#Mechanical_power on bicycles, motorcycles, and in industrial and agricultural machinery....
, track
Caterpillar track

File:279-7.jpgContinuous tracks are large tracks used on the so-called caterpillar tanks, engineering vehicle and certain other off-road vehicles....
 or other perforated or indented material. It is distinguished from a gear
Gear

A gear is a component within a Transmission device that transmits rotational force to another gear or device. A gear is different from a pulley in that a gear is a round wheel that has linkages that mesh with other gear teeth, allowing force to be fully transferred without slippage....
 in that sprockets are never meshed together directly, and from a pulley
Pulley

A pulley is a mechanism composed of a wheel with a Groove between two flanges around the wheel's circumference. A rope, cable or belt usually runs inside the groove....
 by not usually having a flange
Flange

A flange is an external or internal rib, or rim , for Shear strength, as the flange of an iron Beam or I-beam ; or for a guide, as the flange of a train wheel; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc, or on the lens mount of a camera....
 at each side.

Sprockets are used in bicycle
Bicycle

The bicycle, bike, or cycle is a pedal-driven, human-powered transport with two bicycle wheel attached to a bicycle frame, one behind the other....
s, motorcycle
Motorcycle

A motorcycle is a Single track, two-wheeled motor vehicle powered by an Motorcycle engine. Motorcycles vary considerably depending on the task for which they are designed, such as Touring motorcycle travel, navigating Naked bike, Cruiser , Motorcycle sport and Motorbike racing, or off-road conditions....
s, cars
Automobile

An automobile or motor car is a wheeled motor vehicle for transportation passengers, which also carries its own car engine or motor. Most definitions of the term specify that automobiles are designed to run primarily on roads, to have seating for one to eight people, to typically have four wheels, and to be constructed principally f...
, tank
Tank

A tank is a Continuous track, armoured fighting vehicle designed for front-line combat which combines operational mobility and Military tactics Offensive and defence capabilities....
s, and other machine
Machine

A machine is any device that uses energy to perform some activity. In common usage, the meaning is that of a device having parts that perform or assist in performing any type of work....
ry either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track, tape etc.

Cycles
In the case of bicycle chains, it is possible to modify the overall gear ratio
Gear ratio

The gear ratio is the relationship between the number of teeth on two gears that are meshed or two sprockets connected with a common roller chain, or the circumferences of two pulleys connected with a drive belt ....
 of the chain drive by varying the diameter (and therefore, the tooth count) of the sprockets on each side of the chain
Bicycle chain

A bicycle chain is a roller chain that transfers power from the Bicycle pedals to the drive-Bicycle wheel of a bicycle, thus propelling it. Most bicycle chains are made from steel or alloy steel, but some are chrome-plated or stainless steel to prevent rust, or simply for aesthetics....
.






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Sprocket16
Chain
A sprocket is a profiled wheel
Wheel

A wheel is a circular device that is capable of rotating on its axis, facilitating movement or transportation whilst supporting a load , or performing labour in machines....
 with teeth that meshes with a chain
Roller chain

Roller chain or bush roller chain is the type of chain most commonly used for transmission of Power_transmission#Mechanical_power on bicycles, motorcycles, and in industrial and agricultural machinery....
, track
Caterpillar track

File:279-7.jpgContinuous tracks are large tracks used on the so-called caterpillar tanks, engineering vehicle and certain other off-road vehicles....
 or other perforated or indented material. It is distinguished from a gear
Gear

A gear is a component within a Transmission device that transmits rotational force to another gear or device. A gear is different from a pulley in that a gear is a round wheel that has linkages that mesh with other gear teeth, allowing force to be fully transferred without slippage....
 in that sprockets are never meshed together directly, and from a pulley
Pulley

A pulley is a mechanism composed of a wheel with a Groove between two flanges around the wheel's circumference. A rope, cable or belt usually runs inside the groove....
 by not usually having a flange
Flange

A flange is an external or internal rib, or rim , for Shear strength, as the flange of an iron Beam or I-beam ; or for a guide, as the flange of a train wheel; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc, or on the lens mount of a camera....
 at each side.

Sprockets are used in bicycle
Bicycle

The bicycle, bike, or cycle is a pedal-driven, human-powered transport with two bicycle wheel attached to a bicycle frame, one behind the other....
s, motorcycle
Motorcycle

A motorcycle is a Single track, two-wheeled motor vehicle powered by an Motorcycle engine. Motorcycles vary considerably depending on the task for which they are designed, such as Touring motorcycle travel, navigating Naked bike, Cruiser , Motorcycle sport and Motorbike racing, or off-road conditions....
s, cars
Automobile

An automobile or motor car is a wheeled motor vehicle for transportation passengers, which also carries its own car engine or motor. Most definitions of the term specify that automobiles are designed to run primarily on roads, to have seating for one to eight people, to typically have four wheels, and to be constructed principally f...
, tank
Tank

A tank is a Continuous track, armoured fighting vehicle designed for front-line combat which combines operational mobility and Military tactics Offensive and defence capabilities....
s, and other machine
Machine

A machine is any device that uses energy to perform some activity. In common usage, the meaning is that of a device having parts that perform or assist in performing any type of work....
ry either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track, tape etc.

Cycles


In the case of bicycle chains, it is possible to modify the overall gear ratio
Gear ratio

The gear ratio is the relationship between the number of teeth on two gears that are meshed or two sprockets connected with a common roller chain, or the circumferences of two pulleys connected with a drive belt ....
 of the chain drive by varying the diameter (and therefore, the tooth count) of the sprockets on each side of the chain
Bicycle chain

A bicycle chain is a roller chain that transfers power from the Bicycle pedals to the drive-Bicycle wheel of a bicycle, thus propelling it. Most bicycle chains are made from steel or alloy steel, but some are chrome-plated or stainless steel to prevent rust, or simply for aesthetics....
. This is the basis of Derailleur gears
Derailleur gears

Derailleur gears are a variable-ratio transmission system commonly used on bicycles, consisting of a bicycle chain, multiple sprockets and a mechanism to move the chain from one sprocket to another....
. A 10-speed bicycle, by providing two different-sized driving sprockets and five different-sized driven sprockets, allows up to ten different gear ratios. The resulting lower gear ratios make the bike easier to pedal up hills while the higher gear ratios make the bike faster to pedal on flat roads. In a similar way, manually changing the sprockets on a motorcycle can change the characteristics of acceleration
Acceleration

File:Acceleration.JPGFile:Acceleration components.JPGIn physics, and more specifically kinematics, acceleration is the change in velocity over time....
 and top speed
Speed

Speed is the rate of Motion , or equivalently the rate of change of distance.Speed is a Scalar quantity with dimensions length/time; the equivalent Vector quantity to speed is velocity....
 by modifying the final drive gear ratio
Gear ratio

The gear ratio is the relationship between the number of teeth on two gears that are meshed or two sprockets connected with a common roller chain, or the circumferences of two pulleys connected with a drive belt ....
.

Tracked vehicles

Leclerc P1040882
In the case of vehicles with caterpillar tracks the engine-driven toothed-wheel transmitting motion to the tracks is known as the drive sprocket and may be positioned at the front or back of the vehicle, or in some cases, both.

Film and paper


Sprockets are used in the film transport mechanisms of movie projector
Movie projector

A movie projector is an optics-mechanics device for displaying Film by projecting them on a movie screen. Most of the optical and mechanical elements, except for the illumination and sound devices, are present in movie cameras....
s and movie camera
Movie camera

The movie camera is a type of photography camera which takes a rapid sequence of photographs on strips of photographic film. In contrast to a still camera, which captures a single snapshot at a time, the movie camera takes a series of images, each called a "frame"....
s. In this case, the sprocket wheels engage film perforations
Film perforations

Film perforations, also known as perfs, are the holes placed in the film stock during manufacturing and used for transporting and steadying the film....
 in the film
Film

Film encompasses individual motion pictures, the field of film as an art form, and the film industry. Films are produced by recording images from the world with cameras, or by creating images using animation techniques or special effects....
 stock.

Sprocket feed was also used for punched tape
Punched tape

Punched tape or paper tape is a largely obsolete form of data storage, consisting of a long strip of paper in which holes are punched to store data....
 and is used for paper
Paper

Paper is thin material mainly used for writing upon, printing upon or packaging. It is produced by pressing together moist fibers, typically cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets....
 feed to some computer printer
Computer printer

File:Lexmark X5100 Series.jpgIn computing, a printer is a peripheral which produces a hard copy of documents stored in computer file form, usually on physical print media such as paper or Transparency ....
s.

External links



See also

  • Toothed belt