Patent ID: 7886993

Claim:
An injection valve for fuel comprising: a valve housing in which a drive unit controls the movement of a valve needle pretensioned by a spring, the drive unit having a first axial end proximate the valve needle and a second axial end remote from the valve needle, and an axial length between the first and second axial ends, the valve needle operable to close an opening of the injection valve with a valve closure member connected to a portion of the valve needle, an inner chamber in the valve housing, the inner chamber comprising a main chamber and a hydraulic chamber, a hydraulic bearing for the drive unit, wherein the hydraulic bearing includes the hydraulic chamber connected to the main chamber, wherein the hydraulic chamber is filled with high-pressure fuel as operating medium of the hydraulic bearing, and wherein the hydraulic bearing allows the second axial end of the drive unit remote from the valve needle to move axially relative to the valve housing in order to compensate for slow changes in the length of the drive unit, one or more electrical leads connected to the drive unit and extending through an opening at least partially defined by the housing; and a flexible seal configured to seal the one or more electrical leads in the opening, the flexible seal flexing in response to movement of the second axial end of the drive unit.