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March 24 2008 | 20 comments (20 topical, editorial)
Re: March 24 2008 (3.00 / 0) (#13)
by ruddycrazy on Tue Mar 25th, 2008 at 12:43:17 AM MST
(User Info)

Hi Dan,
       With tapered bearings they are designed to have about a 0.002" preload depending on size. When I set tapered bearings at work I generally go or around 0.001-0.002" end float so when the gearbox gets up to temp the expansion will give the required preload.
       As a wind genny only does low speeds (200-300 rpm) I dont think the bearing would heat up too much so personally I'd go for a zero end float/preload. Also with grease make sure they are fully packed with grease and the seals on each end have some crush on the seal journal. Petroluem jelly on the seal face and in the seal cavity ensures the seal will be lubricated long term and it does help in wear prevention on the sealing journal.

       Here's thought on bearings for the larger type turbines. Have 2 tapered bearings back to back set with about a 0.001" end float then about 5-6" down the shaft put a spherical bearing. This arrangement is widely used in gearbox's and would lend itself to RE on larger machines.

Please note these are just my thoughts and I'm not trying to tell you how to mount bearings as I know you guys have been doing it for years.

Cheers Bryan1



March 24 2008 | 20 comments (20 topical, 0 editorial)

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