Construction

Fig. 8 Variable Speed Governer:

Fig. 8 shows the arrangement and functions of a variable-speed governor's components. The input shaft drives the governor assembly, which consists of a centrifugal-weight housing and the weights themselves as well as the governor spring and lever assembly. This assembly is mounted in the housing so that it can rotate around the fixed governor axis. Radial motion of the centrifugal weights is translated into axial movement of the sliding sleeve; the force acting on this sleeve and its position influence the position of the governor mechanism.
In turn, the governor mechanism consists of control lever, tensioning lever and starting lever; the control lever is pivoted in the pump housing and can be adjusted by the fuel-delivery adjusting screw. The starting and tensioning lever also rotate relative to the control lever.
The starting lever has a ball pin on its underside that engages with the control collar. The starting spring is attached to its upper end. At the upper end of the tensioning lever is a retaining pin over which is fitted the idle spring. The governor spring is also hooked into the end of the retaining pin. A lever and the control-lever shaft connect to the engine-speed control lever.
Interaction of spring and sleeve force defines the governor position; control movement is transferred to the control collar, thus determining the quantity of fuel delivered by the distributor plunger.