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 p60 gearboxes

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PostSubject: p60 gearboxes   Sun Jul 24, 2011 8:58 pm

how does the outside ring gear secure to the plates on a p60 gearbox? Is is the same as the older planetary boxes where there are through bolts? and finally could anyone tell me the outside diameter of the ring gear?
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PostSubject: Re: p60 gearboxes   Wed Jul 27, 2011 12:54 pm

Funny you should ask. . .

Lately, I have been putting a lot of time into finding ways to make the P60 gearbox lighter, and currently I have a version that uses HDPE (which has a density less than water!) to replace the front and back plates. I have also turned the 'high speed/low torque' end of the ringgear down, and am in the process of testing an aluminum driveshaft (this one may not work, but I could do titanium). Of course I plan on using only two screws to hold it together, and I am considering milling some material off the carrier plates. I hope to trim 2-to-4 ounces. That's freeing up nearly a half pound on a two motor bot. I figure this be will tough enough for 15lb. drive setups where the gearbox connects to the wheels through belts--I do not think it will withstand battle if the wheel is on the gearbox shaft.

Back on topic--The ringgear is not held all that well--there are four roll pins driven into the front plate that sort of pinch two flat parts on the outside of the front/output end of the ringgear. I am of the opinion that most of the system is way overdesigned, but this one part is pretty flawed. For the new frontplate, I'm just adding a triangle of material where the rollpins go, and it seems to be working very well. I hope to do a full drive test in the next week or so.

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