Re: wheel types


"Keith" <grovenor@xxxxxxxxxxxxx> wrote in message
news:9rv8m1dlij7oqamq8f3l2c7gslar8s1fft@xxxxxxxxxx
> On Sat, 29 Oct 2005 23:05:46 +0100, Ken Parkes
> <cbuffer@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>>On Sat, 29 Oct 2005 14:08:09 +0100, BH Williams wrote:
>>
>>
>>>>
>>> I've not seen spoked and disc wheels on the same axle, but sets with one
>>> side having tread brakes and the other disc brakes are common, being a
>>> feature of the HAA hopper family.
>>
>>That surprises me - I would have expected heavy braking to throw the wagon
>>over to one side - assuming the wheels are coned.***
>>
>>> Not sure how wheels/axles are assembled
>>> in the UK,but in France wagons carrying various sizes of wheels (without
>>> axles) are common at Grande-Synthe yard, Dunkerque, there being a
>>> steelworks nearby which manufactures them.
>>> Brian
>>
>>Can't believe that the pairs aren't turned after fitting to the axles, a
>>tiny discrepancy at the axle stub results in a large eccentricity at the
>>wheel flange. Any fitters out there who can help us?
>>
>>***In fact the difference in braking efficiency is such that I would
>>expect the wagon to leave the track. Do you really mean different braking
>>on each side, as opposed to each end of the wagon? Imagine having
>>calipers on the right side wheels of your car and drums on the left.
>>
> Train axles don't work like your car, there is no differential, so it
> doesn't matter where on the axle you put the brakes the braking effort
> is transmitted to the rails equally through both wheels hence no
> leaving the track or throwing to one side.
> Applying the brakes to only one wheel of the pair is a common
> arrangement, mixing disc and tread brakes less so.
> Keith
>
>
Not that uncommon, though, as over 11000 HAA and derivatives were built.
Another variation is that used on some SNCF container wagons passed for 160
kph running- they have tread brakes on both wheels of both axles (used at
low speeds and for parking) as well as axle-mounted disc brakes. I believe
our (Eurotunnel) second-generation freight shuttle wagons use a similar
system- I must have a look when I get a chance.
Brian


.

Relevant Pages

  • Re: wheel types
    ... >> I've not seen spoked and disc wheels on the same axle, ... >> side having tread brakes and the other disc brakes are common, ...
    (uk.rec.models.rail)
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