Quote:
Originally Posted by sanddrag
In my 15 years in FIRST, most of which consisted of reading Chief Delphi and designing gearboxes, and my 5 years spent studying mechanical engineering, I have never once heard the term "bull gear." Is this some kind of new slang or do I just live under a rock? Would someone care to fill me in?
|
The bull gear is the gear which handles the greatest torque in a drive train. I am most familiar with the term in relation to submarine drive trains, but I have seen it in other contexts.
Quote:
Originally Posted by asid61
Why do you say a planetary can only go up to 14.9:1? The formula should just be R/S + 1, and as R (teeth on ring) gets larger it better approximates a gear rack, so S (teeth on sun) can get smaller while avoiding interference.
|
See
this thread. Essentially, near or beyond this limit, the sun gear is too small to engage the planetary gears. (I assumed that there are at least three; if you only have two, you can go higher).