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AssigneeRobert Bosch GmbH
InventorsWolfgang Gabauer, Dieter Schreckenberger, Tony Wheeler
Estimating the term…
The apparatus has an impoundment container (14), disposed in the tank (10), in which impoundment container a pumping assembly (24) is disposed that pumps fuel to the internal combustion engine (12). A jet pump (60) is supplied with some of the fuel pumped by the pumping assembly (24) and pumps fuel out of the tank (10) into the impoundment container (14). Below the pumping assembly (24), near a bottom (18) of the impoundment container (14), there is a suction chamber (34), from which the pumping assembly (24) aspirates fuel. A connection of the suction chamber (34) to the impoundment container (14) is controlled by a float valve (42), disposed laterally next to the pumping assembly (24), and by means of this valve, when the impoundment container (14) is full, the suction chamber (34) communicates with the impoundment container (14); in this state, the pumping assembly (24) aspirates fuel from the impoundment container (14). A connection of the suction chamber (34) to the tank (10) is controlled by a check valve (52), which is disposed on the bottom (18) of the impoundment container (14) and by which the suction chamber (34) communicates with the tank (10) when the impoundment container (14) is empty; in this state, the pumping assembly (24) aspirates fuel from the tank (10).
An apparatus for pumping fuel from a tank to an internal combustion engine of a motor vehicle, having an impoundment container (14), disposed in the tank (10), in which a pumping assembly (24) is disposed that pumps fuel to the engine (12), having a jet pump (60) to which a portion of the fuel pumped by the pumping assembly (24) is delivered and which pumps fuel out of the tank (10) into the impoundment container (14), having a suction chamber, disposed under the pumping assembly (24) near a bottom (18) of the impoundment container (14), from which suction chamber the pumping assembly (24) aspirates fuel, and having a valve assembly (42, 60), by way of which, when the impoundment container (14) is full, the suction chamber (34) communicates with it and is disconnected from the tank (10), so that the pumping assembly (24) aspirates fuel from the impoundment container (14), and by way of which when the impoundment container (14) is empty, the suction chamber (34) communicates with the tank (10) and is disconnected from the impoundment container (14), so that the pumping assembly (24) aspirates fuel from the tank (10), characterized in that the valve assembly has a float valve (42), which controls the connection of the suction chamber (34) to the impoundment container (14) and is disposed laterally next to the pumping assembly (24), and a check valve (52), which controls the connection of the suction chamber (34) to the tank (10) and is disposed on the bottom (18) of the impoundment container (14).
The apparatus of one of the foregoing claims, characterized in that the float valve (42) has a float body (44), which is guided displaceably in a chamber (46) that communicates with the impoundment container (14) and which carries a valve member (45), by which an opening (40) from the suction chamber (34) into the impoundment container (14) can be closed.
The apparatus of one of the foregoing claims, characterized in that a filter (70) is disposed in the impoundment container (14), through which filter fuel pumped by the jet pump (60) reaches the suction chamber (34).
The apparatus of one of the foregoing claims, characterized in that a filter (57) is disposed in the connection of the suction chamber (34) to the tank (10).
Dependencies are inferred from the claim text.