Engine having variable lift valvetrain

An engine assembly comprising:

• an engine structure;
• a camshaft rotationally supported on the engine structure, defining a longitudinally extending rotational axis and including first and second lobes;
• a rocker arm rotationally supported on the engine structure and including:
• a first arm engaged with the first lobe of the camshaft and a first engine valve and defining a first longitudinal bore;
• and
• a second arm adjacent the first arm, engaged with the second lobe of the camshaft and defining a second longitudinal bore;
• a locking assembly including a first lock pin located within the first longitudinal bore, an actuation pin extending through a radial passage in the rocker arm and engaged with the first lock pin, and a first biasing member engaged with the first lock pin and urging the first lock pin toward the actuation pin and biasing the actuation pin radially inward;
• and
• an actuation assembly including an actuation member engaged with the actuation pin and linearly displaceable between first and second actuation positions, the first and second arms being rotatable relative to one another when the actuation member is in the first actuation position and being fixed for rotation with one another by the first lock pin when the actuation member is in the second actuation position.

An engine assembly comprising:

• an engine structure;
• a camshaft rotationally supported on the engine structure, defining a longitudinally extending rotational axis and including first and second lobes;
• a rocker arm rotationally supported on the engine structure and including:
• a first arm engaged with the first lobe of the camshaft and a first engine valve and defining a first longitudinal bore;
• a second arm engaged with the second lobe of the camshaft and defining a second longitudinal bore;
• and
• a third arm engaged with a third cam lobe on the camshaft and a second engine valve and defining a third longitudinal bore, the second arm located between the first and third arms;
• a locking assembly including a first lock pin located within the first longitudinal bore, a second lock pin located in the second longitudinal bore, an actuation pin extending through a radial passage in the rocker arm and engaged with the first lock pin, and a first biasing member located in the third longitudinal bore, the first biasing member engaged with the first lock pin and urging the first lock pin toward the actuation pin and biasing the actuation pin radially inward;
• and
• an actuation assembly including an actuation member engaged with the actuation pin and linearly displaceable between first and second actuation positions, the first and third arms being rotatable relative to the second arm when the actuation member is in the first actuation position, the first lock pin being located within the first and second longitudinal bores and the second lock pin being located within the second and third longitudinal bores when the actuation member is in the second actuation position to fix the first, second and third arms for rotation with one another.