BOMBA DE INYECCION DE COMBUSTIBLE LIQUIDO PARA SUMINISTRAR COMBUSTIBLE LIQUIDO A UN MOTOR DE COMBUSTION INTERNA

摘要

A fuel injection pump for an internal combustion engine is of the rotary distributor type and has a high pressure pump which includes a cam ring which is angularly adjustable by means of a piston to vary the timing of fuel delivery. The piston is biased to a position suitable for starting the engine by a first spring, the first spring being located between the piston and a collar. The latter is biased by a second preloaded spring against which the piston can move after the clearance between the piston and collar has been taken up. An electromagnetic device includes an armature core which can exert a thrust on the piston but which in the absence of fluid pressure is unable to move the piston against the springs. When fluid pressure is applied to the piston the combined forces acting on the piston are sufficient to move the piston to the limit of movement of the armature core to compress the first spring and also partly to compress the second spring.