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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240 All About Engines
end of the lever which operates the valve to be swung
on one side, the valve to be inspected, reground, or
replaced with a minimum of time and trouble. A
section through the exhaust valve, showing the jointed
lever, will be found in Fig. 135> while the three valves
in the cylinder cover are shown in
Fig. 137. — Method
governing Mirrlees
Diesel engine
Fig. 136.
The method of governing is ex-
tremely interesting. The fuel is
pumped into a small chamber on the
cylinder cover, from which it is in-
jected into the cylinder by means
of compressed air, and the amount
pumped into this chamber is con-
trolled by the governor. Fig. 137
shows how this is done. The pump
is driven by an eccentric, and the
plunger enters a chamber a which is
filled with oil. Suppose the volume
of the plunger which enters this
chamber on every downward stroke
is i cubic inch. Then, provided the
suction valve just below the plunger
end closes at the commencement of
the stroke, the amount of oil de-
livered to the chamber on the cylinder covei foi the
engine is 1 cubic inch. But if the suction valve re-
mains open for a time after the stroke has commenced
the delivery is less. And this is just what happens.
When the engine is running too fast the governor
balls fly outwards and the suction valve is held open