Delivery system
AssigneeRobert Bosch GmbH
InventorsHans-Joerg Fees, Reinhard Dittmann, Christoph Mittermueller
Life of this patent
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Abstract
In known delivery systems, a pump chamber and a revolving impeller in the pump chamber rotating about a pump axis, in which protuberances are provided inside the pump chamber on predetermined end walls, it is disadvantageous that the protuberances very and are complicated to make. In the delivery system of the invention, the friction in the pump chamber is reduced and the efficiency is improved by providing spacers, which space the impeller apart from the end walls of the pump chamber. That the protuberances are disposed in at least one ring around the pump axis.
Claims13
In a delivery system for delivering fuel from a fuel tank to the internal combustion engine of a motor vehicle, having a pump chamber and a revolving impeller, rotating about a pump axis in the pump chamber, in which protuberances are provided on predetermined end walls inside the pump chamber, the improvement wherein the protuberances (28) are disposed in at least one ring (29) around the pump axis (8), wherein recesses or grooves (27) embodied as indentations in said end walls are provided between the protuberances (28).
Dependencies are inferred from the claim text.