Patent ID: 6109894
Filing Date: 2000-08-29
Classification: F01M,F02M

Abstract:
Device formed of two piston pumps for feeding two independent liquid circuits and in particular the fuel injection circuit and oil circuit for internal combustion engines, said device comprising:(a) a single monoblock housing in which are fixed bodies of said two pumps,(b) a single drive shaft with cams for controlling the two pumps,(c) a set of oil pump pistons moving in a first direction, each oil pump piston cooperating with one of said cams to be moved away from said drive shaft, a spring recalling said oil pump piston,(d) a set of injection pump pistons moving perpendicularly to the said first direction of the oil pump pistons, each injection pump piston cooperating for thrusting and recall with one of said cams with the aid of a half-ring whose opening is directed towards a corresponding oil pump piston, and extremities of said half-ring respectively comprising a piston guide and a piston rod, said piston rod and piston guide being placed with one being an extension of the other, said piston rod sliding in a cylinder comprising an aperture which defines a start of injection with one slanted extremity of said piston rod and an end of injection with a hole provided on said piston rod.