View Single Post
  #4   Spotlight this post!  
Unread 07-06-2016, 17:36
Mr V's Avatar
Mr V Mr V is offline
FIRST Senior Mentor Washington
FRC #5588 (Reign)
Team Role: Coach
 
Join Date: Feb 2011
Rookie Year: 2009
Location: Maple Valley Wa
Posts: 994
Mr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond reputeMr V has a reputation beyond repute
Re: pic: 2451 PWNAGE Planetary Drive

Quote:
Originally Posted by JohnFogarty View Post
Besides weight saving and real-estate gain. Are planetary gearboxes more or less efficient than regular non-planetary gearboxes?
Quote:
Originally Posted by pwnageNick View Post
Generally they are less efficient. Due to this being a custom setup, to know what the efficiency of this setup would be a prototype would need to be built to find that out. A prototype would also test any issues with loads, and how stable the wheel would be.
In general a planetary reduction is less efficient than a spur gear reduction. However this set up isn't really a planetary reduction and should have a frictional loss essentially a simple spur gear reduction.

The extra frictional losses occur in a planetary reduction because of the increased number of gear to gear interfaces.

In your basic spur gear reduction you have 1 gear to gear interface per stage. With a planetary set up you have 6 or 8 gear to gear interfaces as well as the friction of the pins that the planets rotate on.

This set up however does not have a sun nor really any planets, it is just the driven gear turned inside out.
__________________
All statements made on Chief Delphi by me are my own opinions and are not official FIRST rulings or opinions and should not be construed as such.




https://www.facebook.com/pages/Team-...77508782410839
Reply With Quote