Patent ID: 9494116
Filing Date: 2016-11-15
CPC Classification: F02M,Y10T

Claim Text:
1. A fuel injector for a fuel injection system, the fuel injector having a nozzle body ( 1 ) and an injector body ( 2 ), wherein in the nozzle body ( 1 ) is formed a high-pressure bore ( 3 ) to accommodate a stroke-mobile nozzle needle ( 4 ), via a stroke movement of which an injection opening ( 5 ) can be opened or closed, and wherein in the injector body ( 2 ) is formed a low-pressure chamber ( 6 ) to accommodate a piezoelectric actuator ( 7 ) which via a coupling device ( 8 ) is hydraulically coupled or decoupled with the nozzle needle ( 4 ) such that the nozzle needle ( 4 ) opens the injection opening ( 5 ) when the piezoelectric actuator ( 7 ) is electrically charged, characterized in that the coupling device ( 8 ) comprises a first and a second disk-shaped coupler body ( 9 , 10 ) each with a cylinder bore ( 11 , 12 ), each cylinder bore ( 11 , 12 ) defining a cylinder bore interior volume, each cylinder bore ( 11 , 12 ) accommodating a coupler piston ( 15 , 16 ) delimiting a coupler chamber ( 13 , 14 ) within the cylinder bore interior volume of the cylinder bore ( 11 , 12 ), such that each coupler chamber ( 13 , 14 ) is disposed entirely within the cylinder bore interior volume of one of the cylinder bores ( 11 , 12 ), wherein a connecting piston ( 17 ) is provided for mechanical connection of the nozzle needle ( 4 ) with the coupler piston ( 15 ) accommodated in the first disk-shaped coupler body ( 9 ), wherein the connecting piston ( 17 ) slides within a guide bore ( 18 ) formed in the first disk-shaped coupler body ( 9 ), the guide bore ( 18 ) defining a guide bore ( 18 ) interior volume such that the connecting piston ( 17 ) slides within the guide bore ( 18 ) interior volume, and wherein the guide bore ( 18 ) opens into the coupler chamber ( 13 ) of the first disk-shaped coupler body ( 9 ), the guide bore ( 18 ) being disposed axially between the nozzle needle 4 and the coupler chamber ( 13 ) of the first disk-shaped coupler body ( 9 ).