Aggregate for feeding fuel from supply tank to internal combustion engine of motor vehicle

摘要

Aggregate for feeding fuel from a supply tank to an internal combustion engine of a motor vehicle has a feeding pump formed as a flow pump and including a disc-shaped rotatable impeller. A hydraulic buffer is formed between the impeller and the end walls of the pump chamber and includes recesses provided in a structure selected from the axial end surface of the impeller and the end walls of the pump chamber, so that the recesses are fillable with fuel during operation of the feeding pump and form the hydraulic buffer which acts in an axial direction of the impeller and stabilizes the impeller. An outer ring which connects the vanes of the impeller at their radially outer ends and limits the impeller in a peripheral direction. The recesses are arranged in a region of the outer ring.