Alberto,
None of those bearing types are necessary. A standard deep groove ball bearing, as found in "standard" pillow blocks or two or four bolt flanges, will take the thrust force our low power electric motors generate just fine.
If you want to wade through the application engineering, SKF has a bearing life calculator on their website. It will take some time to dig through but you can get the exact life (L10 prediction,anyway) for your system. The engineering specs also list the axial force the grub screw mounting can withstand.
A bearing large enough to fit on your prop shaft, correctly installed, will give many thousands of hours service.
MRC (a division of SKF) has a line of pillow blocks and flanges meant for the food processing industry. These have plastic housings and anti-corrosion plating on the steel parts to withstand steam cleaning. The plastic housing can take the same loads as cast iron. More info here: http://www.skf.com/portal/skf_us/home/products?contentId=520015&lang=en
Denny Wolfe
----- Original Message -----From: Alberto CogutSent: Wednesday, March 24, 2010 1:37 PMSubject: [Electric Boats] Bearing
Hello all,
Last weekend I finally finished removing the diesel engine from my sailboat (Dufour 34). Currently, I'm finalizing the design of the electric propulsion system that will replace it, and I have a question that I hope those in the group that have designed their own systems will be able to help me with. What kind of bearing should I use that will withstand the axial loads? Should I consider tapered roller, spherical roller, or angular ball bearings?Thanks in advance,
Alberto
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