What is Sprocket: Definition and 17 Discussions

A sprocket, sprocket-wheel or chainwheel is a profiled wheel with teeth, or cogs, that mesh with a chain, track or other perforated or indented material. The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain passing over it. It is distinguished from a gear in that sprockets are never meshed together directly, and differs from a pulley in that sprockets have teeth and pulleys are smooth except for timing pulleys used with toothed belts.
Sprockets are used in bicycles, motorcycles, tracked vehicles, and other machinery either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track, tape etc. Perhaps the most common form of sprocket may be found in the bicycle, in which the pedal shaft carries a large sprocket-wheel, which drives a chain, which, in turn, drives a small sprocket on the axle of the rear wheel. Early automobiles were also largely driven by sprocket and chain mechanism, a practice largely copied from bicycles.
Sprockets are of various designs, a maximum of efficiency being claimed for each by its originator. Sprockets typically do not have a flange. Some sprockets used with timing belts have flanges to keep the timing belt centered. Sprockets and chains are also used for power transmission from one shaft to another where slippage is not admissible, sprocket chains being used instead of belts or ropes and sprocket-wheels instead of pulleys. They can be run at high speed and some forms of chain are so constructed as to be noiseless even at high speed.

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  1. D

    Can a Hydraulic Motor Determine Torque and RPM for a Two Chain Sprocket System?

    [Mentor Note -- postprocessed attached image for clarity] Hello! Looking for a formula(s) on how I can determine the Torque and RPM needed on the chain (by hydraulic motor) to move the load in the illustration at 240 inches per minute. The load will vary, so I won’t ever really need to push...
  2. B

    Speed Transmitting Between Motor Gearbox and Sprocket

    Chain length: 1400mm. Pitch of the chain:12,7 mm Diameter: Ø55 For z=12 Diameter: Ø71 For z=16 Diameter: Ø87 For z=20 Hello friends, Can someone who has knowledge of how to calculate the speed transferred to the sprocket wheel can help in such systems with various gear numbers (z = 20, 16)...
  3. X

    How can I calculate the maximum speed of a go kart?

    Hello, I'm going to build a solar-powered go-kart. To determine the sprocket that I want to use I need a formula to calculate the top speed which also considers vehicle weight and other resistance forces. All the formulas I found just used sprocket tooth and rpm to calculate top speed but of...
  4. B

    How to Calculate the Speed of a Sprocket?

    How to calculate the speed of sprocket connected to the turbine shaft of a cross flow turbine if I only have these given parameters: Net Head, Volume Flow Rate, Specific Weight of Water and Efficiency of Cross Flow Turbine? Does the Cross Flow Turbine, Turbine Shaft and Speed of Sprocket have...
  5. D

    Help Calculating Forces on engaged sprocket teeth

    Hello, I am trying to analyze the forces on a chain and sprocket system. Specifically the force on each tooth that is engaged with the chain rollers on a driven sprocket. Here are a couple links on the topic, however niether of which provide a derivation or sample calcs on how they got their...
  6. L

    Sprockets, chains, and gears question

    hello. I'm tring to find a compatible sprocket for my chain. I need to know what these abbreviations mean here: http://www.ebay.com/sch/i.html?_odkw=sprocket+40&_sop=15&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xsprocket+40+3%2F4.TRS0&_nkw=sprocket+40+3%2F4&_sacat=0 For...
  7. r_prieto5

    Sprocket diameter, chain link pressure, transverse vibration

    Homework Statement Power=P, rotation speed n1, rotation speed n2, chain center distance c, life = Lh All I need for this one is the formula for sprocket diameter. I have found calculators (https://www.rbracing-rsr.com/calcsprocketdiam.html) but no reference to the formula. Chain pitch and...
  8. R

    Designing F1 Car w/ Duke 390 Engine: Sprocket Dimensions

    hello, I'm designng a f1 car,,, we are using a duke 390 engine...we are using a chain differential... now I'm trying to make the sprockets. to make this sprockets i need to know its dimensions.. that is sprocket teeth diameter width etc... so, I'm very much confussed with it. how to get this...
  9. synMehdi

    Automotive Can You Convert a Trike Differential Gear to a Chain Drive for a Kart?

    Hi, I'm a beginner in mechanics so I need some help with a project I started. My project consists of a small kart-like car. The car will be Rear-Wheel-Drive and Rear-Engine too (RR layout). and I am willing to use a small 110cc moped engine. I have a trike Differential Gear for the rear shaft...
  10. Alex Mercer

    Sprockets+Roller chain+Rotation >Linear oscillation; how?

    Hello there! I am a high school student, and I am really interested in Physics, esp. electronics and mechanics; I am not an expert or something, so please don't take it hard on me. Yesterday, I was bored and I messed around and successfully made a catapult...
  11. M

    Noise in Engines: Investigating Chain & Sprocket Design

    hi.. can someone help me out with noise in engines.. i am specifically interested in noise due to running of chain on sprockets.. it is a sort of whistling noise... which are those parameters in design of sprocket and chain which contribute in noise.. we can also talk in terms of different...
  12. H

    Finding a Custom Sprocket for an Electric Motor Bike

    I have an electric motor that I want to use with a bike chain and not the small chain that is already on it. Using cad and getting a custom sprocket made might be the way to go, but finding a site that sells them would be more than likely be cheaper. I found that it is called a dual-d boreand is...
  13. G

    How Do You Design a Chain and Sprocket System for a 25mph Scooter?

    Homework Statement You would like to build a little scooter using an engine. The rear drive wheel/tire that you have is 16 inches in total diameter. You also have a 16 tooth sprocket gear (approx. 2.5 inches in diameter) that will fit on the engine crankshaft. Design a chain and sproeckt system...
  14. B

    Sprocket and Spur Gear Chain Drive Question

    I looking for help on a problem I am trying to solve here at work. I am not an ME, so my mechanics knowledge is low. This isn't helped by the fact that my mechanics class was 13 years ago. I have a label applicator that is not geared correctly, so it runs slower than the wrapper that it is...
  15. M

    Can a Sprocket and Chain System Be Compared to a Rope on a Pulley?

    Hi everyone, I am just looking at some calculations i did a while ago, where i have a hydraulic ram with a rotating sprocket on top, with chain passing over it attached to a load at the the other end. It is a similar set up to a forklift. My query is: Can the sprocket and chain set up be...
  16. W

    How Is Angular Speed Calculated for a Chain Saw Sprocket?

    The drawing (attached) shows the blade of a chain saw. The rotating sprocket tip at the end of the guide bar has a radius of 3.8 10-2 m. The linear speed of a chain link at point A is 6.5 m/s. Find the angular speed of the sprocket tip in rev/s. Vt= w/r 6.5= w/ .038 w=.247 rev/ sec...
  17. E

    How To Choose A Sprocket Chain

    How I can choose a chain's sprockets for my Mechanical System ... Please need Sprocket's Tables Depending On Shafts Daimeters Or The Power . For Example If I have 35 mm shaft Need any tables for that ...