Actuation apparatus

An actuation transmission apparatus for actuating a component of a switchable valve train device of an internal combustion engine, the apparatus comprising:

• a shaft rotatable by an actuation source;
• a contacting element configured to contact the component of the switchable valve train device;
• and
• a biasing device configured to bias the contacting element rotationally with respect to the shaft,
• wherein, the biasing device is configured to be biased by the shaft when the actuation source rotates the shaft to actuate the component of the switchable valve train device, via the contacting element, when the component of the switchable valve train device is not configured to be actuated, the biasing device being configured to cause the contacting element to actuate the component of the switchable valve train device when the component of the switchable valve train device becomes actuatable,
• wherein the actuation transmission apparatus comprises a lever mechanically coupled to the shaft and extending radially therefrom, the lever being rotatable, by the actuation source, about an axis of the shaft, so that the shaft is rotatable by the actuation source, and
• wherein the lever comprises one or more mechanical stopping features configured to restrict an extent of rotation of the lever about the axis of the shaft.

A valve train assembly of an internal combustion engine, the valve train assembly comprising:

• an actuation source;
• a switchable valve train device comprising a component;
• and
• an actuation transmission apparatus for actuating the component, the actuation apparatus comprising:
• a shaft rotatable by the actuation source;
• a contacting element configured to contact the component;
• and
• a biasing device configured to bias the contacting element rotationally with respect to the shaft,
• wherein, the biasing device is biased by the shaft when the actuation source rotates the shaft when the actuation source acts to actuate the component, via the contacting element, when the component is not configured to actuate, the biasing device thereby configured to cause the contacting element to actuate the component when the component is actuatable,
• wherein the actuation source is configured to rotate a drive rod about an axis of rotation of the drive rod, and
• wherein the axis of rotation of the drive rod is perpendicular to an axis of rotation of the shaft.

A valve train assembly, comprising:

• an actuation source connected to a drive rod;
• a switchable valve train device comprising a component;
• and
• an actuation transmission apparatus for actuating the component, the actuation apparatus comprising:
• a shaft rotatable by the actuation source;
• a curved surface configured to contact the component of the switchable valve train device;
• and
• a coil spring arranged around the shaft and configured to bias the curved surface rotationally with respect to the shaft,
• wherein the coil spring is configured to be energized by the shaft when the actuation source rotates the shaft
• wherein the actuation source is configured to rotate the drive rod about an axis of rotation of the drive rod, and
• wherein the axis of rotation of the drive rod is perpendicular to an axis of rotation of the shaft.