Patent ID: 7367300

Claim:
A valve drive for an internal combustion engine having a valve which is axially displaceable between an open position and a closed position and is prestressed by a locking spring in the direction of its closed position, comprising: a control shaft; an electric motor arranged to bi-directionally rotate the control shaft about a control shaft longitudinal axis; a cam driven by the control shaft and disposed to control opening and closing of the valve as the control shaft rotates; a pressure element arranged to pivot about a pivot axis; and a spring element, wherein the pressure element is arranged to bi-directionally pivot about the pressure element pivot axis as the control shaft bi-directionally rotates, the spring element applies a torque to the control shaft via the pressure element, and a mass moment of inertia of the pressure element about the pressure element pivot axis is greater than a mass moment of inertia of the control shaft and the cam about the control shaft longitudinal axis.