Device for adjusting the full-load injection quantity of a fuel injection pump for internal combustion engines

Claim 3

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 1, in which: said means for restricting displacement of said adjusting piston includes a stop means which engages one end of said piston, and said stop means is adjustable in accordance with operating parameters of said combustion engine.

Claim 4

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 2, which includes: an adjusting member of said stop means subjected to a restoring force spring, said adjusting member having one surface exposed to a reference pressure and another surface exposed to a control pressure, said control pressure corresponding to the pressure of the air delivered to the combustion engine, and said adjusting member is adjustable by means of the pressure difference between said reference pressure in collaboration with said restoring force spring and said control pressure.

Claim 5

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 3, in which said stop means rests against said adjusting piston in its initial position and retains said adjusting piston in its initial position with the assistance of said restoring spring.

Claim 6

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 3, which includes: a fixed stop means which limits a maximum displacement travel of said adjusting piston counter to said restoring spring.

Claim 7

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 3, in which: said work chamber includes a throttle bore which communicates with said pressure source, and a pressure maintenance valve which communicates with said work chamber and with a relief chamber.

Claim 8

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 1, in which: said work chamber includes a throttle bore which communicates with said pressure source, a control valve, a relief chamber, said control valve communicating with said work chamber and said pressure relief chamber, and said control valve is controllable in accordance with operating parameters of said engine including the density of the air delivered to said combustion engine.

Claim 9

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 7 wherein: said control valve comprises a pressure limiting means and further that a point at which said control valve opens is variable in accordance with operating parameters.

Claim 10

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 7 wherein: said control valve comprises a pressure control means whereby a pressure is maintainable in accordance with operating parameters of said engine.

Claim 11

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 9 in which: said pressure control means includes a cylinder having a closed end, a control piston in said cylinder, a pressure chamber formed in one end of said control piston and said closed end of said cylinder which communicates with said work chamber, said control piston including an annular groove which forms upper and lower control edges, a bore in said piston which extends from said pressure chamber in said cylinder to said annular groove in said piston, a pressure medium supply line connected to said cylinder, a pressure relief line connected to said cylinder, said pressure medium supply line and said pressure relief line are connected to said cylinder and controlled by said upper and lower control edges on said control piston for communication with said pressure chamber via said bore in said piston such that at a fixed position of said control piston both said pressure medium supply line and said relief line may be closed simultaneously by said control edges, means that applies a control force onto said control piston counter to a fluid pressure force in said pressure chamber in which a portion of said control force applied by said means corresponds to the density of air delivered to the combustion engine.

Claim 12

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 10 in which: said control piston is exposed to a basic force exerted in the same direction as the control force.

Claim 13

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 3 which includes: an adjusting member, said adjusting member including a contoured portion, and said stop means comprises an adaptation piston which is displaceable transversely to the displacement direction of said adjusting piston by said adjusting member, against which said adjusting piston is made to rest by means of the rpm-dependent pressure acting upon said piston.

Claim 14

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 12 in which: said adjusting piston has a slit on its end oriented toward said restoring spring, which is parallel to its jacket face, and said adaptation piston is flattened, in a functional vicinity of an overlap with said adjusting piston in a manner that is adapted to the width of said slit.

Claim 15

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 12 in which: said adaptation piston is provided with a restoring spring, and the maximum displacement travel of the adaptation piston counter to said restoring spring is limited by a stop means.

Claim 16

A device for adjusting the full load injection quantity of a fuel injection pump according to claim 12, in which: said work chamber communicates with said pressure source via said throttle bore and may be made to communicate with the relief side via said pressure maintenance valve.