1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Centrifugaleffect on lubricant exerted on small or large gear

  1. Aug 2, 2014 #1
    Chain lubricant must be applied to two gears connected by a chain.

    The two gears are of different size. The question is now, if it is better to apply the lubricant at the larger or smaller gear, if we wanted to minimize the amount of lubricant lost due to centrifugal force.

    The math:

    Centrifugal force:

    F= V^2 / R

    Since the two gears are connected by a chain, V should be the same. Therefore my math intuition says that the larger of the gears would exert less centrifugal force on the lubricant. Am i correct in this analysis?
  2. jcsd
  3. Aug 2, 2014 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF;
    That sounds like safe reasoning for that question: you are saying that since the speed of the outer rim of each gear is the same (due to chain) then the centrifugal force is inversely proportional to the radius of each gear. Therefore: applying lube to the bigger cog minimizes the force. Assuming the lubricant sticks equally hard to each gear, this minimizes the potential loss of lubricant due to the centrifugal effect.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted