Author: Haroon Khalil

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 Let S = Spring force FC = Centrifugal force W = Weight…

In this governor, balls are connected by a spring (in two parts) and one more spring is used in sleeve mechanism to adjust the radius of rotation of the balls as shown in Figure 14.8. Figure 14.8 Willson–Hartnell Governor Let          P = Tension in the main spring A          S = Tension in spring B          w = Weight of each ball…

The Hartnell governor is shown in Figure 14.7(a). The two bell crank levers are used which can rotate about fulcrums O and O′. One end of both bell crank lever carries a ball and a roller at the other end of the arm. The rollers make contact with the sleeve. A helical spring is mounted on the spindle between frame…

The Proell governor has the balls at B and C to the extension of the links DF and EG, as shown in Figure 14.6(a). The arm PF and GQ are pivoted at P and Q, respectively. Consider the free body diagram of half of the governor as shown in Figure 14.6(b). The instantaneous centre (I) lies on intersection of…

A schematic diagram of the porter governor is shown in Figure 14.5. There are two sets of arms. The top arms OA and OB connect balls to the hinge O. The hinge may be on the spindle or slightly away. The lower arms support dead weight and connect balls also. All of them rotate with the spindle. We can consider one-half of…

Watt Governor This governor was initially used by James Watt in steam engine. The spindle is driven by the output shaft of the prime mover. The balls are mounted at the junction of the two arms. The upper arms are connected to the spindle and lower arms are connected to the sleeve as shown in Figure…

The classification of governors is shown in Figure 14.3. Figure 14.3 Classification of Governors

There are some general terms used in governors that describe qualities of governor. These terms are as follows:

Governor takes care of the change of speed due to load variation over periods of the engine’s running and tends to keep it as close to the mean speed as possible, where as the flywheel is responsible only in keeping the speed fluctuations, during each cycle within certain permissible limits of the mean speed. As…