Fuel injection pump for internal combustion engines
AssigneeRobert Bosch GmbH
InventorsErnst Ritter, Reinhard Schwartz, Johann Warga
Life of this patent
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Abstract
Each of the pump cylinders disposed in a line, of the fuel injection pump is surrounded in the vicinity of an overflow opening controlled by control edges of the pump piston by a partial suction chamber embodied as a hollow space. Each of these partial suction chambers is supplied with fuel, beginning at an inflow conduit via a throttled inflow opening and the fuel is carried away again via a return-flow opening into a return-flow conduit common to all the pump cylinders. Because of the crosswise flushing of each individual partial suction chamber the fuel temperature in these partial suction chambers is kept at least virtually constant, in order that identical fuel quantities will be supplied to the individual pump cylinders.
Claims20
A fuel injection pump for internal combustion engines,
- comprising a plurality of pump cylinders disposed in line in reception bores of a pump housing having a top, each of said pump cylinders arranged to receive a pump piston provided with control edges to determine the duration of injection;
- said control edges arranged to control one overflow opening in a wall of said pump cylinder, said pump cylinder further being surrounded in the vicinity of said at least one overflow opening by a partial suction chamber;
- said partial suction chamber having an inlet conduit arranged to supply fuel thereto and said conduit arranged to extend in a longitudinal direction of said pump housing,
- each said partial suction chamber having a separate return-flow conduit connected via return-flow openings, wherein each return-flow opening has a flow-through cross section (A.sub.R) that is smaller than the cross section of said return-flow conduit,
- and wherein each of said partial suction chambers is embodied as a hollow space which completely surrounds the pump cylinder and communicates with the return-flow conduit only via the return-flow opening and with said inlet conduit only via a throttled inlet opening.
Dependencies are inferred from the claim text.