This is a device, applicable to either Diesel or hot-bulb engines having multiple cylinders, for enabling one or more cylinders to be successively cut out when the load falls to a certain predetermined point..
The gear so acts that these cylinders cannot resume their share of the load unless the load should again rise above another predetermined higher point.
The mechanism comprises a crank to one end of which the governing rod is connected, and which crank is pivoted on a suitable fixed portion of the engine. Between this fulcrum and the point of attachment of the governor rod is connected an arm which actuates a spindle in such a manner that the latter holds open the suction-valve of the fuel-pump during a portion of the stroke of the pump plunger.
The duration of the opening of this suction-valve depends on the position of the crank, and this in its turn is dependent upon the governor. On the arm is also provided a projection which at a certain predetermined position of the governor rod drops onto a step abutting from a rocking lever depending from the pump body.
The suction-valve is thus held open permanently and all fuel cut off from the cylinder, until such time as the governor rod drops sufficiently to permit of the arm slipping from the step.