All About Engines
Forfatter: Edward Cressy
År: 1918
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 352
UDK: 621 1
With a coloured Frontispiece, and 182 halftone Illustrations and Diagrams.
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All About Engines
Great Britain is the Joy, shown in Fig. 152. The
motion of the valve rod is effected through a system
of levers driven from the connecting rod, and no
eccentric is used. The best way to understand this
and all other gears is to cut out models in thin card-
board and to study the position of the valve for every
position of the crank, both on the forward and back-
ward strokes.
Fig. 153.—Walschaert valve gear
The Walschaert gear (Fig. 153), which is found on
almost all continental and American engines, and is
growing in favour in this country, looks rather more
complicated. In this case the movement of the valve
is effected partly by an eccentric, or, on outside
cylinder engines, by a return crank, and partly by a
lever pivoted to the cross head. The eccentric act-
ing alone gives a valve movement in which there is
no lead, and the cross-head motion supplies lead.
British engines have usually two cylinders of the