The Westinghouse Friction Draft Gear
År: 1900
Forlag: Barlett & Company, The Orr Press
Sted: New York
Sider: 28
UDK: 625.201 Jern
Built by The Westinghouse Air Brake Co., Pittsburgh, Pensylvania, U.S.A.
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This diagram shows the Relative Capacities of the
Ordinary Draft Spring (20,000 Pounds Capacity) and
the Westinghouse Friction Draft Gear to Absorb
and Dissipate Buffing and Pulling Effects. It also
shows the Reactive Effects of Each.
The rising line, BB'A, represents the action of
the Westinghouse gear under pulling or buffing
stress, starting at an initial compression of about
2000 pounds, as shown at the left of the diagram, and
rising to a maximum stress of 142,000 pounds. The
total area, BA CB, represents the work done in arrest-
ing the buffing or pulling stress, while the lightly
shaded area represents the amount of energy dissipated
as heat by the frictional gear. The shaded portion is
in this instance found to be 80 per cent, of the total
area, BACB, only 20 per cent, of the energy of
impact being given back in recoil as shown by the
non-shaded portion of the area BACB.
The straight line DE represents the operation
é of an ordinary spring gear starting from zero com-