Patent ID: 6874705

Claim:
A unit injector system for supplying the combustion chamber ( 17 ) of an internal combustion engine with fuel, having a high-pressure chamber ( 25 ) that can be subjected to pressure via a pump piston ( 3 ), and having a storage piston ( 23 ), received inside a storage chamber ( 24 ), that is acted upon via a compression spring ( 22 ) disposed in a spring holder chamber ( 42 ), characterized in that disposed between the element chamber ( 25 ) and the storage chamber ( 24 ) of the storage piston ( 23 ) is a return flow throttle element ( 35 ), which return flow throttle element ( 35 ) is passable in a second direction ( 40 ) corresponding to the opening direction of the storage piston ( 23 ), and characterized in that the return flow throttle element ( 35 ) reduces the closing direction of the storage piston ( 23 ) in a first direction ( 39 ) corresponding to the closing direction of a storage piston ( 23 ), so that the return flow throttle element delays the buildup of pressure in the storage chamber ( 24 ).