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

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SUMMARY

The discussion focuses on designing a chain and sprocket system for a scooter intended to achieve a speed of 25 mph using a 5 horsepower engine operating at 3600 RPM. The rear drive wheel has a diameter of 16 inches, and a 16-tooth sprocket is mounted on the engine crankshaft. The challenge lies in determining the specifications for an intermediate sprocket to connect the engine sprocket to the rear tire sprocket, which is not specified to have 109 teeth, to achieve the desired speed.

PREREQUISITES
  • Understanding of gear ratios and their calculations
  • Familiarity with chain drive systems
  • Basic knowledge of rotational speed and linear speed conversion
  • Experience with mechanical design principles
NEXT STEPS
  • Research gear ratio calculations for chain and sprocket systems
  • Learn about the relationship between RPM and linear speed in wheel systems
  • Explore intermediate sprocket design considerations
  • Investigate the effects of different sprocket sizes on overall performance
USEFUL FOR

Mechanical engineers, hobbyists building scooters, and students studying mechanical design principles will benefit from this discussion.

gongsta
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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 that will allow your scooter to travel at 25mph at rated engine speed.
engine horsepower: 5
engine speed: 3600rpm
note: there must be an intermediate gear and sprocket between the engine(and sprocket) and the back tire, also my professor confirmed that the sprocket on the back tire does not have 109 teeth.

Homework Equations


The Attempt at a Solution


back tire speed: 525 rpm
engine speed: 26.77 mph
I can seem to find no matter what equation I use to find any details about the middle sprocket.
 
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I don't know what equation to use to solve this or if I am missing something. Can anyone help me out?
 

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