Abstract: A device for converting a rotational motion of a valve element into a translational motion of same having a valve element bearing-supported such that it is translationally movable along a translation axis, a cam element with a cam curvature. The cam element is rotatable about an axis of rotation, wherein connected with the valve element is a stem by means of which the valve element can be moved translationally along the translation axis and which comprises an engagement element in engagement with the cam curvature. The engagement element is braced from two sides of the cam element by the stem, and wherein, by rotation of the cam element about the axis of rotation, the engagement element is guided along the cam curvature such that the stem executes a translational motion whereby the valve element executes a translational motion.

Abstract: The invention pertains to an actuator for actuating a valve, the valve featuring a drive and at least one rotational threaded element with a first and a second threading segment and a third threading segment positioned between them. The actuator further features a drive element that is translationally driven by the threaded element. The actuator according to the invention is characterized in that the pitch angle in the third threading segment is greater than the pitch angle in the first and second threading segment.

Abstract: The invention relates to a device for converting a rotational motion of a valve element into a translational motion of same with: a valve element bearing-supported such that it is translationally movable along a translation axis, a cam element with a cam curvature, wherein the cam element is rotatable about an axis of rotation, wherein connected with the valve element is a stem by means of which the valve element can be moved translationally along the translation axis and which comprises an engagement element in engagement with the cam curvature, wherein the engagement element is braced from two sides of the cam element by the stem, and wherein, by rotation of the cam element about the axis of rotation, the engagement element is guided along the cam curvature such that the stem executes a translational motion whereby the valve element executes a translational motion.

Abstract: An actuator for a lever that is connected, with a valve or a wastegate or a variable turbine geometry of an exhaust gas turbocharger. The actuator includes a connecting rod between a drive and the lever. The connecting rod is rotatably supported at a location some distance from the lever. The connecting rod is further guided between the support and the lever on a circular arc.