Below is some renders and a link to the CAD model for the drive gearbox we have developed that is based off of our 2019 season drive gearbox. This version utilizes a 4" wheel instead of the 6" wheel we used in 2019, and thus allows everything to generally be smaller.
Some basic information:
-13.21fps free speed with a final ratio of 7.5:1 (12:60 20DP spur gear stage, followed by 32:48 20DP spur gear stage, 4" wheel)
-3.70lbs projected weight from SolidWorks (based on 2019 we expect this to pretty accurate).
-Design allows for air to be hooked up to the motors for quick cooling. We had this feature on our 2019 robot but never needed to use it. We just designed it in here to be safe.
-Gearbox is fully enclosed to keep any debris out. We were happy with this feature and have decided to do it again in the future, and likely try to do this on other robot features in the future when possible and convenient.
-Removed the mag encoder mount that the 2019 version had. We had this designed in on the 2019 version but never ended up mounting it on as our programmers were happy with the performance of the internal encoders on the NEO. This would always be pretty easy to add back in later if desired.
-Yellow plate is aluminum to allow the NEOs to heat sink through it and the frame. The other plates are nylon plate with the casing and spacers above and below the frame tube printed out of onyx on our Markforged.
-Design could easily utilize many 4" wheel options; VEX Colson wheel used in the model for example.
CD link here to reference our 2019 drivetrain gearbox.