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Re: Technical Discussion About Axle Journal Bearings

Posted by nasadowsk on Sat Oct 11 21:13:32 2008, in response to Re: Technical Discussion About Axle Journal Bearings, posted by SelkirkTMO on Sat Oct 11 18:49:06 2008.

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From Budd's patent, 2908230, the point of inboard mounting was a reduced bending moment on the axle, and secondly, lower weight.

The point of the design overall was a simple truck that was light, easy to maintain, and didn't derail on bad track.

Inboard bearing trucks existed long before the PIII, but it was Budd that popularized them. BTW, the first powered version, on the 1958 Silverliners, had a right angle drive with a high speed traction motor (6500 rpm!). It wasn't fully successful, and a traditional drive was adopted in on the SL II cars. I don't know if the right angle drive was ever duplicated, either.

I'm guessing the reduced bending moment was also to allow for hollow axles with the metal technology of the time, though they're pretty much standard on everything outside North America these days. The PIIIs, at least, had them from delivery to retirement - you can see them in the DOT tests using those cars.

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