Category: Advance Concept Mechanical Eng

The difference between flywheel and governors is given in Table 14.1   Table 14.1 Differences Between Flywheel and Governors Flywheel Governors It is provided on the engine and fabricating machines, viz., rolling mills, punching machines, shear machines, presses, etc.Its function is to store available mechanical energy when it is in excess of the load requirements and to…

This method is used for smaller gas engines. In this system, whenever the engine starts running at higher speed, some explosions are missed or omitted. This is done with the help of governor in which the inlet valve of fuel is closed and the explosions are omitted till the engine speed reaches its normal value.…

In this system, quality of charge remains constant but quantity of air–fuel mixture supplied to the engine is varied by means of centrifugal governors. Centrifugal governor regulates the throttle valve; whenever the engine starts running at higher speed due to decreasing load, the quantity of charge is reduced till the engine speed reaches to its…

In this method, the amount of fuel entering the cylinder is varied by altering the stroke of the oil pump or by passing a part of fuel which would have otherwise been injected into the engine cylinder back to the oil tank or by delaying the closing of the suction valve in the fuel pump…

Governing is an action to control the fuel supply so that the engine runs at practically constant speed. When load on an engine increases the speed drops and when load decreases the speed increases. Thus to control the fluctuation in engine speed, fuel requirement increases during increasing load and fuel requirement decreases during decreasing load.…

A governor is said to be sensitive, if change of speeds from no load to full load may be as small a fraction of the mean equilibrium speed as possible and the corresponding sleeve lift may be as large as possible. Sensitiveness of a governor can be found by dividing the difference between maximum and…

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…