Ben Goren wrote: > The AC-51s use 6207-2RS bearings; my main job is to research their side > loading capacity. However, Bill says there're a number of side-loaded AC- > 35s out there, and that he thinks I'm probably okay -- though, of course, > I need to confirm that. If anybody can suggest a good way to put some > numbers to that, I'd appreciate it.
Not sure if it helps, but here is a specific example of a pair of HPEVs AC-31s installed in a side-loaded arrangement: <http://evalbum.com/4283> You can see more details of the torque combiner unit on John's (the owner's) site: <http://www.signaturerenewables.com/component.php> His torque combiner uses a 2:1 ratio belt drive to connect the two motors to a common output, and you might just be able to re-use his design in your application with little modification. Certainly, it can't hurt to ask. Regarding putting numbers on the acceptable side load, or conversely, on the life of the bearing under a given load condition, this Timken calculator might be useful: <http://www.timken.com/EN-US/Knowledge/engineers/Pages/BearingLife.aspx> Your 6207 crosses dimensionally to Timken's 207W, MM207K, and MMC207K ball bearings; of these, the 207W seems to have higher rated life. On this page, click 'Select Type' and select "BB" from the list, then enter "207W" into the part number box and click 'Lookup'. After this you can enter radial and axial loads and speed values and hit 'Calculate' to see the effect on fatigue life. My understanding is that radial (side) load is exactly what the ball bearing is designed to handle, and that the real concern is the axial loading that these bearings might be subjected to in a more typical EV conversion with a manual clutch. For greater axial load capability one might want to upgrade the bearings to an angular contact type, however, in your case axial load should be minimal. Cheers, Roger. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
