Brake Tests
År: 1913
Forlag: Pensylvania Railroad Company
Sted: Altoona, Penna.
Sider: 401
A Report Of A Series Of Road Tests Of Brakes On Passanger Equipment Cars Made At Absecon, New Jersey, In 1913
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256
of the shoe were in working contact with the wheel the temperatures
would be correspondingly high, but when the bearing area shifted to
some other place on the face of the shoe the pyrometer indicated
Fig. 154.
BRAKE SHOE BEARING AREA-PLAIN SLOTTED SHOE.
merely the temperature increase due to the conduction from that part of
the shoe at which the heat was being generated.
505. For this reason the maximum temperature readings were
very erratic and it was found that the only method which would give
uniform temperature readings was to allow sufficient time after an
observed maximum reading to permit the heat to become uniformly
distributed by conduction throughout the whole shoe. It was found
that the shoe temperature thirty seconds after maximum was consistent
and proportional to or a function of the initial test speed as shown by Fig.
157, because the total amount of energy dissipated by the shoe in any
stop will be proportional to the square of the speed and while some of
this energy will pass into the wheel in the form of heat and some will