Valve drive of an internal combustion engine having an adjustment device

A valve drive for controlling gas exchange valves of an internal combustion engine having a cylinder head, the valve drive comprising:

• a driving disk arranged in a chamber;
• at least one valve camshaft, which is mounted within the cylinder head of the internal combustion engine and can be set into rotation via the driving disk, having cams;
• an adjustment device having an adjustment motor and a gearing, the adjustment device ensures an axial displacement and/or rotation of the at least one valve camshaft relative to the driving disk in a specific manner when the adjustment motor is actuated by the gearing in order to vary an actuation of the gas exchange valves, which occurs via the cams of the at least one valve camshaft,
• wherein the adjustment motor is placed predominantly or completely within the chamber with the driving disk,
• a driving constructional unit, which bears against the driving disk, having an axial bearing unit, wherein the gearing comprises a nut connected fixedly to one end of the at least one valve camshaft and a spindle connected to the adjustment motor, and the gearing is supported by the axial bearing unit on the driving constructional unit such that a relative rotation, which is introduced by the adjustment motor, of the spindle with respect to the driving disk can be converted into an axial displacement of the nut, and
• projections provided on the nut and radial stops which are each placed in a fixed position on the spindle and, beyond a defined position, enter into contact with the projections provided on the nut, and the axial displacement of the nut in both axial directions being limited by the radial stops.

An internal combustion engine for driving a motor vehicle, comprising:

• gas exchange valves;
• a cylinder head;
• a valve drive for controlling the gas exchange valves of the internal combustion engine, the valve drive comprising:
• a driving disk arranged in a chamber;
• at least one valve camshaft, which is mounted within the cylinder head of the internal combustion engine and can be set into rotation via the driving disk, having cams;
• and
• an adjustment device having an adjustment motor and a gearing, the adjustment device ensures an axial displacement and/or rotation of the at least one valve camshaft relative to the driving disk in a specific manner when the adjustment motor is actuated by the gearing in order to vary an actuation of the gas exchange valves, which occurs via the cams of the at least one valve camshaft,
• wherein the adjustment motor is placed predominantly or completely within the chamber with the driving disk,
• driving constructional unit, which beast against the driving disk, having an axial bearing unit, wherein the gearing comprises a nut connected fixedly to one end of the at least one valve camshaft and a spindle connected to the adjustment motor, and the gearing is supported by the axial bearing unit on the driving constructional unit such that a relative rotation, which is introduced by the adjustment motor, of the spindle with respect to the driving disk can be converted into an axial displacement of the nut, and
• at least one guide body disposed in a radial direction between the at least one valve camshaft and the driving constructional unit, the at least one valve camshaft and the driving constructional unit have helical guide tracks that correspond to each other, the guide body runs in the guide tracks, and, upon axial displacement of the at least one valve camshaft, the guide body moves along the guide tracks and effects a relative rotation of the at least one valve camshaft with respect to the driving constructional unit.