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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253
stops. Some time was required to remove the shoe, measure its bear-
ing area and replace it and consequently the temperature of the shoe
as a whole was much lower than it would be for the same stop made
continuously. The heating of the shoe during the intermittent stop
SHOE -CLASP BRAKE.
SHOE NO. 567
Fig. 151.
BRAKE SHOE BEARING AREA—PLAIN SOLID SHOE.
The shaded portion shows where the shoe does not come in contact with the wheel.
was not only less but was more evenly distributed than in a continuous
stop. This results in a decreased tendency to warp. The instanta-
neous values of coefficient of friction were obtained directly from the
dynamometer record. It is apparent that these coefficients of friction,
considered either singly or averaged, are very much greater than the
mean coefficient of friction obtained for similar stops made continu-
ously.
497. This indicates that although the intermittent tests were
made as nearly as possible equivalent to continuous tests, the una-
voidable difference in the conditions had a decided influence and this