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1. GOVERNOR AND ITS TYPE
MADE BY H.P. PATEL

2. INTRODUCTION
• The function of a governor is to regulate the
mean speed of an engine, when there are
variations in the load
• For example, when the load on an engine
increases, its speed decreases, therefore it
becomes necessary to increase the supply of
working fluid.
• On the other hand, when the load on the engine
decreases, its speed increases and thus less
working fluid is required.

3. • The governor automatically controls the
supply of working fluid to the engine with the
varying load condition and keeps the mean
speed within certain limits.
• A little consideration will show that, when the
load increases, the configuration of the
governor changes and a value is moved to
increase the supply of the working fluid ;
conversely, when the load decreases, the
engine speed increases and the governor
decreases the supply of working fluid.

4. • The function of a flywheel in an engine is entirely
different from that of a governor.
• It controls the speed variation caused by the
fluctuation of the engine turning moment during
each cycle of operation.
• It does not control the speed variation caused by
a varying load.
• The varying demand for power is met by the
governor regulating the supply of working fluid.

5. Type of governor
• The governors may, broadly. Be classified as
1. Centrifugal governor
2. Inertia governor

6. CENTRIFUGAL GOVERNOR

7. • The centrifugal governor sure based on the
balancing of centrifugal force on the roaring
ball by an equal and opposite force, known as
the controlling force.
• It consists of two balls of equal mass, which
are attached to the arms as shown in fig.
• These balls are known as governor balls or fly
balls. The balls revolve with a spindles, which
is driven by the engine through bevel gears.

8. GOVERNOR EFFORT
• It is defined the mean force exerted on the
sleeve during a given change in speed in
speed. When governor speed is consists the
net force at the sleeve is zero. When governor
speed increase, there will be a net force on
the sleeve to move it upwards and sleeve
starts moving to the new equilibrium position
where net force becomes zero.

9. PORTER GOVERNOR

10. • IN porter governor central load is attached to
the sleeve as shown in fig.
• The load moves up and down the central
spindle. This additional downward force
increase the speed of revolution required to
enable the ball to rise to any predetermib=ned
level.
• Consider the force acting on one half of the
governor as shown in fig.

11. HARTNELL GOVERNOR

12. • A Hartwell governor is a spring loaded
governor as shown in fig, it consists of two bell
crank levers pivoted at points o,o to the
frame.
• The frame is attached to the governor spindle
and therefore rotates with it.
• A helical spring in compression provides equal
down ward forces on the two rollers through a
collar on the sleeve.

13. PROELL GOVERNOR

14. • The proell governor has two balls fixed at b &
c to the extension of the links DF & EG. As
shown the arms FP& GQ are pivoted at P& Q
respectively.
• Consider the equilibrium of the on one half of
the governor. The instantaneous centre lies on
the intersection of the PF produced and the
lies from the D perpendicular to the axis.

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