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 15:55:10 GMT
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Viewed:
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1202 times
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In lugnet.trains, Christopher Masi writes:
> Taken from G. Benedikt Rochow's post
>
> How about: on each bogie but the first/last, have 2 vertical axles, one
> for each car; each with a 24t gear (the 2 of which are meshing).
> Mount the 2 cars using that bogie (or their pendulum bases, rather) on
> these 2 axles, and the bogie will always be at the midpoint of their
> relative angle. That's still not perfectly in line with the track
> at all times, but closer than being locked to one car.
>
> | | | axles for cars to sit on
> -ggg-GGG- g, G the 2 gears
> ===== - the gears' teeth
> ooo = top of bogie where axles stick into; needs
> ooooo to be repeated above gears
> ooo o side of one of the track wheels.
>
> G?
>
> The axels holding the gears would be locked at the connection to the coach and
> pivot at the connection to the wheelset? This may work because any change in • the
> position of the wheelset from perpendicular to the track postion would • encouter
> resistance because the coaches either have to stay in a straight line or the • ends
> must move in the same direction.
Exactly; rather than the wheelset turning the cars, the first car to enter
a curve (or leave it) turns against the "stationary" second car,
while the wheelset turns "half as fast", or to half the angle,
between them. It won't always be perfectly perpendicular
to the track, but even in S-curves, it will be rather close, I think.
On the other hand, the pendulum action needs to be either gravity-driven,
or, if it's to be controlled by curves, i.e. the relative wheelset
turn, a plain slanted turn axis won't do, because of unequal turn angles
on 2 ends of a car. Either the swing needs to be locked
to only the bogie turn at one end of each car, or, for perfect
swing-in and swing-out, the two turn angles need to be averaged
with a differential...
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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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