Variable valve actuation device for engine

A variable valve actuation device for an engine, the variable valve actuation device comprising:

• a camshaft including a first cam, a second cam, and a control cam;
• a rocker arm mechanism including:
• an extended roller shaft, and
• a rocker arm roller rotatably mounted to the roller shaft, the rocker arm roller configured to slide axially along the roller shaft so as to engage the first cam when in a first operating position, and engage the second cam when in a second operating position;
• an actuation mechanism associated with the rocker arm mechanism, the actuation mechanism including:
• a pneumatically-controlled actuation cylinder defining a cylinder hole,
• an actuating piston arranged in the cylinder hole, and
• a roller shift fork coupled to the actuating piston, the roller shift fork configured to axially flank the rocker arm roller so as to effectuate a switching of the rocker arm roller between the first and second operating positions when the actuation cylinder actuates the actuating piston;
• and
• a blocking mechanism coupled to the actuation mechanism, the blocking mechanism including:
• a blocking rod shaft mounted to the actuation cylinder, and
• a blocking rod pivotally mounted to the blocking rod shaft so as to engage the control cam, the control cam configured to cause the blocking rod to intermittently engage the roller shift fork such that (i) the switching of the rocker arm roller is prevented when the blocking rod is in contact with the roller shift fork, and (ii) the switching of the rocker arm roller is enabled when the blocking rod is out of contact with the roller shift fork.