The Hartung governor is shown in Figure 14.9. In this governor, the vertical arms of the bell crank levers are fitted with spring balls which compress against the frame of the governor when the rollers at the end of horizontal arms press against the sleeve.
Figure 14.9 Hartung Governor
S = Spring force
FC = Centrifugal force
W = Weight of sleeve
x and y = Lengths of vertical and horizontal arms of bell crank lever, respectively.
Taking moment about fulcrum O, we get
Example 14.7: In a Hartung type governor ball arm and sleeve arm length are 80 and 100 mm, respectively. The total travel of the sleeve is 15 mm. In the mid position each spring is compressed by 40 mm and radius of rotation of mass centre is 120 mm, each ball has a mass of 4 kg and spring has a stiffness of 10 kN/m in compression. The equivalent mass at governor sleeve is 15 kg. Neglecting the moment due to revolving masses and when the arms are inclined, determine the speed in the mid position.
Solution:
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