Fuel injection pump for internal combustion engines

A fuel injection pump comprising a housing, a cylinder in said housing, at least one work chamber, in said cylinder, a pump piston enclosing said work chamber in said cylinder, a plurality of fuel injection supply lines in said housing connectible in turn in communication with said work chamber during a pump stroke of said pump piston, a fuel supply conduit in communication with said work chamber during at least part of a rest position of said pump piston between a suction stroke and a pump stroke, a fuel quantity dispensing valve in said fuel supply conduit upstream from said work chamber which has a time controlled opening period, a plurality of relief lines in said housing disposed by distributed about a circumference of said cylinder in a radial plane which discharge into said cylinder in communication with said work chamber in accordance with a number and distribution of the supply conduits and a plurality of reservoirs, said relief conduit being operably opened during a predetermined stroke of said pump piston during a pump stroke by a first control edge in synchronism with said pump stroke on said pump piston, said first control edge being disposed on a jacket face of a pump piston which rotates in synchronism with a pump piston drive means, said pump piston being guided within said cylinder thereby simultaneously serving as a fuel distributor, said pump piston having a distributor opening communicating with said pump work chamber, said distributor opening during rotation of said pump piston, and during a compression stroke registering in turn with one of said fuel injection supply lines thus brought in communication with said work chamber, and at least one second edge on said pump piston, said at least one second edge on said pump piston functioning to provide communication between said pump work chamber and one of said plurality of reservoirs during at least part of said rest position of said piston, and said at least one second control edge is disposed on said pump piston such that a connection with said reservoir is closed prior to a subsequent pump stroke of said piston and prior to an injection of fuel into said injection supply line.

A fuel injection pump comprising a housing, a cylinder in said housing, at least one work chamber, in said cylinder, a pump piston enclosing said work chamber in said cylinder, a plurality of fuel injection supply lines in said housing connectible in turn in communication with said work chamber during a pump stroke of said pump piston, a fuel supply conduit in communication with said work chamber during at least part of a rest position of said pump piston between a suction stroke and a pump stroke, a fuel quantity dispensing valve in said fuel supply conduit upstream from said work chamber which has a time controlled opening period, at least one relief conduit in said housing in communication with said work chamber and a reservoir, said reservoir being embodied as a volumetric reservoir which communicates with a first relief line controlled by a first control edge and with a second relief line which is controlled by a second control edge, said relief conduit being operably opened during a predetermined stroke of said pump piston during a pump stroke by said first control edge in synchronism with said pump stroke of said pump piston, said first control edge being disposed on a jacket face of said pump piston which rotates in synchronism with a pump piston drive means, said pump piston being guided within said cylinder thereby simultaneously serving as a fuel distributor, said pump piston having a distributor opening communicating with said pump work chamber, said distributor opening during rotation of said pump piston, and during a compression stroke registering in turn with one of said fuel injection supply lines thus brought in communication with said work chamber, and at least one second edge on said pump piston, said at least one second edge on said pump piston functioning to provide communication between said pump work chamber and said reservoir during at least part of said rest position of said piston and said second control edge is disposed on said pump piston such that a connection with said reservoir is closed prior to a subsequent pump stroke of said piston and prior to an injection of fuel into said injection supply line.