The effort of a governor is the mean force exerted at the sleeve for a given percentage change of speed (or lift of the sleeve). It may be noted that when the governor is running steadily, there is no force at the sleeve. But, when the speed changes, there is a resistance at the sleeve which opposes…
Hartnell governor is a spring controlled centrifugal governor, in which a spring controls the movement of the ball and hence the sleeve. Above fig shows a Hartnell governor. It consists of a frame /casing, in which a pre compressed helical spring is housed. The casing and spring can rotate about the spindle axis. The spring…
An isochronous governor having structure which provides a pressure force to compensate for the relative decrease of governor spring force with respect to flyweight force as engine load increases, thereby allowing the engine controlled by the governor to maintain operation at a constant speed under varying load high idle, no load speed, at all times….
Consider two governors A and B running at the same speed. When this speed increases or decreases by a certain amount, the lift of the sleeve of governor A is greater than the lift of the sleeve of governor B. It is then said that the governor A is more sensitive than the governor B….
In this method, equilibrium of the forces acting on the link BD are considered. The instantaneous centre I lies at the point of intersection of PB produced and a line through D perpendicular to the spindle axis, as shown in Fig. 6.4. Taking moments about the point I, Fig. 6.4. Practise Problems: (2.) Porter governor…
Considering the equilibrium of the forces acting at D, we have Again, considering the equilibrium of the forces acting on B. The point B is in equilibrium under the action of the following forces, as shown in Fig. 6.3 (b). (i) The weight of ball (w = m.g), (ii) The centrifugal force (FC), (iii) The tension in the…
The Porter governor is a modification of a Watt’s governor, with central load attached to the sleeve as shown in Fig. 5.3 (a). The load moves up and down the central spindle. This additional downward force increases the speed of revolution required to enable the balls to rise to any predetermined level. Consider the forces…
The simplest form of a centrifugal governor is a Watt governor, as shown in Fig. 5.2. It is basically a conical pendulum with links attached to a sleeve of negligible mass. The arms of the governor may be connected to the spindle in the following three ways : 1. The pivot P, may be on the…
The following terms used in governors are important from the subject point of view ; 1.Height of a governor. It is the vertical distance from the centre of the ball to a point where the axes ofthe arms (or arms produced) intersect on the spindle axis. It is usually denoted by h. 2. Equilibrium speed. It is the…
The centrifugal governors are based on the balancing of centrifugal force on the rotating balls by an equal and opposite radial force, known as the controlling force. Centrifugal governor consists of two balls of equal mass, which are attached to the arms as shown in Fig. 5.1. These balls are known as governor balls or fly balls. The balls…