Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Failure of helical gears

  1. May 18, 2017 #1
    Hi everyone.
    I'm a college student, and I need help of experts with gears.

    What I know is that there are two dynamics in gear : rolling and sliding.
    And I heard that the main cause of failure (wear) of spur gear is rolling.

    Then... how about the cause of failure in the case of helical gear??
    I felt that the sliding works as more important role in helical gear than spur gear because of their geometry.
    But I can't find any literature that comparing effect of rolling and sliding on the surface of helical gear teeth (especially for failure).

    And what is a difference between failure by rolling and sliding on the gear teeth??

    I hope I could get an answer...
    Thank you!
     
  2. jcsd
  3. May 19, 2017 #2

    Baluncore

    User Avatar
    Science Advisor

    Think of the helical gear as a stack of very thin spur gears with a one tooth twist in the stack. You will then see that helical and spur gears should be identical in wear characteristics. The advantage of helical is that there is no instant of tooth meshing contact, so the gears run quieter. The disadvantage is the end thrust.

    Where did you hear that? Do you have a reference?
     
  4. Jun 8, 2017 #3
    In it not clear just what this statement means. In a spur gear, there is sliding contact at all points of engagement other than momentarily at the pitch point. Nothing actually rolls. What exactly did you have in mind here?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted