Diesel engine fuel injection pump governor

In a governor for an engine fuel injection pump having a fuel control rod adapted to be connected to the fuel injection pump to control the fuel injection volume, flyweights, governor spring means, a manual engine speed control member, a first linkage including an idling spring, a first rod axially movable by the flyweights and engaging at one end with the idling spring, a tension lever having an intermediate fulcrum and being pivotally connected at one end to the first rod, a second rod slidably carrying thereon the governor spring means and first and second spring seats engagable with the opposite ends of the governor spring means, the other end of the tension lever being engagable with the first spring seat so that the flyweights move against the force of the governor spring means as the engine speed rises, a guide lever pivotal about the same point as the tension lever, a floating lever, the guide lever being pivotally connected at its end to one end of the floating lever, a first link, one end of the first link being pivotally connected to the other end of the floating lever and the other end of the first link being pivotally connected to the control rod, a second linkage including a second link having an intermediate fulcrum and pivotally engagable at one end with the second spring seat and at its other end with the control rod, the improvement comprising:

• biasing means urging the guide lever to rotate with the tension lever, the biasing means normally operatively maintaining the guide lever in engagement with the tension lever and being arranged to yield when the control member is in a low engine speed demand position and the engine speed is above a predetermined value to prevent the control member from being moved by the floating lever, and
• yieldable means including an arm rotatable about a fixed point and carrying a first pin slidable in a longitudinal slot formed through the floating lever and a second pin, the control member being engagable with the second pin when rotated in one direction, and second biasing means to urge the arm in a direction to engage the second pin with the control member so that when the control member is in the low engine speed demand position and the engine speed is above the predetermined value, the flyweights move the first rod to thereby rotate the tension lever, but the guide lever remains stationary against the force of the biasing means so that the control member remains in the low engine speed demand position.