Schaeffler Technologies Ag & Co .kg

Jan Pfannenmuller

Markus Popp

Harald Elendt

Matthias Ammann

A sliding cam system is provided including: at least one sliding cam arranged in a fixed, but axially slideable manner on at least one axially fixed base shaft for forming a cam shaft of a reciprocating internal combustion engine; at least one actuator device for adjusting the sliding cam into different axial positions using at least one actuator pin that can engage in at least one sliding groove on a circumference of the sliding cam, wherein the actuator device has a housing attached to the engine and the sliding grooves are arranged in a groove section of the sliding cam; and a bracket encompassing the groove section using side shoulders, directed parallel to a longitudinal axis of the base shaft and provided with an opening in a region of the actuator pins, wherein the sliding cam has at least two sliding grooves having at least partially different depths, wherein the bracket is directed in the actuator device and wherein a positive-fit depth stop device is provided between the bracket and the actuator pin(s).

Sliding cam system having two-stage actuator stroke

A method for operating an internal combustion engine with a sliding cam valve train that has a cam part () with three adjacent cams of different lifts (H, M, L) and a groove-shaped connecting link path with two path sections (S, S) that lift in both axial directions of the cam part and are arranged completely one behind the other around the circumference is provided. An actuator () selectively couples two actuator pins () in the connecting link path, in order to move the cam part. The base position of the cam part should be moved into a desired axial position during the operation of the internal combustion engine through successive coupling of the actuator pins in the connecting link path.

Variable lift valve train of an internal combustion engine

A sliding cam valve train for an internal combustion engine is provided. A cam piece () displaceably arranged on a carrier shaft () includes a cam group () with differing cam lifts and an axial groove with two groove tracks (), which are arranged completely behind one another in the circumferential direction of the axial groove. An actuator pin () which may be introduced into the axial groove displaces the cam piece in the direction of both groove tracks. Each of the groove tracks end with a radially lifting ramp () for extending the actuator pin from the axial groove. The radial lift of the exit ramps should be significantly smaller than the groove base depth of the axial groove between the exit ramps.

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Nuremberg, Germany

Jan Pfannenmuller