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US 5,086,742 AGranted
Fuel injection pump for internal combustion engines
AssigneeRobert Bosch GmbH
InventorHans-Jorg Vogtmann
Life of this patent
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AssigneeRobert Bosch GmbH
InventorHans-Jorg Vogtmann
Estimating the term…
For the sake of improving quiet operation during idling and at low partial load by lengthening the injection duration, a fuel injection pump for internal combustion engines has a relief conduit originating in a pump work chamber, the relief conduit including a throttle and being blockable at upper partial load, full load and openable by a control slide. The relief conduit is controlled by a pressure maintenance valve, the opening pressure of which can be adapted from outside to the opening pressure of injection nozzles. The control slide is controlled by a centrifugal governor in such a manner that at idling and lower partial load. The control slide is shifted by the pressure in a fuel low-pressure chamber into its operating position that uncovers the relief conduit, and at upper partial load, full load and starting, the control slide is disconnected from the low-pressure chamber, so that it can drop back into its basic position that blocks off the relief conduit.
A fuel injection pump for internal combustion engines, comprising a housing, a piston bore in said housing, a piston operative in said piston bore, a pump work chamber defined in said housing, by said pump piston, at least one pressure line leading from said work chamber to at least one injection nozzle, a relief conduit (34) extending from said work chamber for diverting a partial fuel quantity during a compression stroke of said pump piston in order to lengthen injection duration, a throttle (35) in said relief conduit, a control slide (36) disposed in said relief conduit for blocking off said relief conduit at upper partial load and at full load, an adjustable pressure maintenance valve (37) in said relief conduit for closing off said relief conduit, and means for adjusting an opening pressure of said adjustable pressure maintenance valve (37) in accordance with the opening pressure of said at least one injection nozzle.
In a fuel injection pump for internal combustion engines for lengthening an injection duration which comprises:
Dependencies are inferred from the claim text.