Subject:
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Re: high speed railways and strange flat bed cars
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Newsgroups:
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lugnet.trains
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Date:
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Tue, 23 Mar 1999 15:33:31 GMT
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Reply-To:
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LPIEN@IWANTNOSPAM.CTP.COMspamless
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Viewed:
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1259 times
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Christopher Masi wrote:
>
> Larry Pieniazek wrote:
> Right the wheels are not on the same axel. At first I thought this was so the
> wheels could travel at different speeds, but differentials are not brought up
> elsewhere in trains (are they) so I figured that couldn't be the reason.
That is in fact the reason that they are separate. If they are on a
common axle, the outer wheel tends to want to climb up and rub the
flange against the inner side of the rail (remember, train wheels have a
tapered profile, the diameter on the outside is smaller than on the side
of the wheel closest to the flange... that profile is there to allow
them to corner better with less wheel slippage).
By being independent there is much less climbing.
> Then I
> though maybe it is so they can lower the coach; if part of the coach can sit
> between the wheels then the coach does not have to be as high fo the ground. Now
> I am wondering does this mean that the wheels turn independently like the front
> wheels of a car, or does the entire wheel set pivot about a center vertical axis.
I don't think lowering is a big part of it. The wheels turn in the
vertical plane independently, they do not share a common pivot point.
They are not connected. The wheels are steered by the bars connecting
them to each coach. M. Rochow's suggestion on how to model the turning
effect using two horizontal gears seems like a great idea.
--
Larry Pieniazek http://my.voyager.net/lar
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Message is in Reply To:
 | | Re: high speed railways and strange flat bed cars
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| Larry Pieniazek wrote: snip stuff about footnoting (...) Right the wheels are not on the same axel. At first I thought this was so the wheels could travel at different speeds, but differentials are not brought up elsewhere in trains (are they) so I (...) (25 years ago, 22-Mar-99, to lugnet.trains)
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