Patent ID: 8136741
Filing Date: 2012-03-20
Classification: F02M

Abstract:
1. A fuel injection device for an internal combustion engine with direct fuel injection, the device comprising a housing with an annular chamber, a pressure chamber, and a hydraulic coupler having a coupling chamber disposed between the annular chamber and the pressure chamber, a high-pressure connection to a common rail, the annular chamber and the pressure chamber being constantly in communication with the high pressure connection to the common rail, a multiple part valve element disposed in the annular chamber and the pressure chamber of the housing, at least two parts of the multiple part valve element having opposed ends within the coupling chamber of the hydraulic coupler, a valve seat located in a region of at least one fuel outlet opening, the multiple part valve element cooperating with the valve seat, and the hydraulic coupler coupling the opposed ends of the at least two parts of the valve element to one another, wherein movement of one of the opposed ends of one of the parts of the valve element in a direction towards the valve seat causes hydraulic pressure in the hydraulic coupler to increase and movement of said one of the opposed ends in a direction away from the valve seat causes hydraulic pressure in the hydraulic coupler to decrease while high pressure from the common rail prevails in the annular chamber and the pressure chamber.