Shifting camshaft groove design for load reduction

An engine assembly, comprising:

• an engine structure including a block and a cylinder head that define a plurality of cylinders;
• a plurality of pistons disposed in the plurality of cylinders;
• a crankshaft drivingly connected to the plurality of pistons;
• a camshaft assembly drivingly connected to the crankshaft and including;
• a base shaft including at least one lobe pack axially movably mounted on the base shaft, the lobe pack including a control groove therein;
• an actuator device including an actuator body and a pin movably mounted to the actuator between a retracted position and an extended position for engaging with the control groove to cause axial movement of the lobe pack;
• wherein the control groove includes a pin engagement region, a shifting region and an ejection region, the pin engagement region of the control groove having a first pair of parallel sidewalls with a first groove width therebetween and being disposed along a first plane orthogonal to a rotational axis of the base shaft, the shifting region extending from the pin engagement region and having a second pair of sidewalls angled relative to the first pair of parallel sidewalls and having a first portion with a varying groove width that narrows relative to the first groove width, and the ejection region extending from the shifting region and having a third pair of parallel sidewalls extending along a second plane orthogonal to the rotational axis of the base shaft and axially spaced from the first plane and having a second groove width narrower than the first groove width.