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Unread 16-09-2010, 02:13
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
Team Role: Teacher
 
Join Date: Jul 2002
Rookie Year: 2002
Location: Glendale, CA
Posts: 8,507
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Re: Custom "Car Style" Drive System

I too am curious where the power will be input to this device. Typically it is driven through the case/housing/carrier.

The design also has a problem, in that each gear is supported by only one single-row bearing. You need another bearing on there, close by. Then use a coupling or universal joint to get the power out and away from the unit. Basically, make the differential it's own robust unit. Shorten those shafts, and have separate ones that go out to the wheels. The alignment of the gears should not rely on a bearing that is many inches away down the shaft, located on a completely separate mounting piece. As shown, the gears will wear quickly, and possibly bind.

As Adam said, some sort of friction clutch (perhaps even adjustable) on the center gear could be beneficial, to help prevent single wheel burnouts. Watch the movie "My Cousin Vinny" It is explained well.

Remember, design with the idea that you may make it to finals, and you wouldn't want it to be on the verge of failing when the stakes are high.
__________________
Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004

Last edited by sanddrag : 16-09-2010 at 02:15.