52
Fig. 8
2. MECHANICAL GOVERNORS FOR FOUR
STROKE ENGINES
a) GENERAL
All four stroke engines are fitted with centrifugal type
governor (Fig 8). This consists of a plastic gear «A» which
is caused to rotate by the camshaft gear.
b) STANDARD GOVERNOR (FIG 8)
The gear carries links «B» which open under the action
of a centrifugal force and move spool «C» away from the
gear. The crank of governor rod «R» is in contact with
the spool «C».
The other end of the rod projects through the crankcase
and to this is connected a lever and spring which
automatically adjusts the engine speed.
c) OLEOMATIC GOVERNOR FOR HORIZONTAL
ENGINES (FIG 9)
The governor spool (A - Fig. 9) is pushed by the centrifugal
masses (D) and slides along the spindle (B) which has
holes and allows oil to be drawn inside the spool. This
gives a low pressure oil dampening effect which eliminates
any slight governor fluctuation. This type of governor is
used mainly in generator applications.
Besided the system shown in fig. 9, there is a simpler
version with perforated spool.
Fig. 9
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