Apparatus for actuating a latching arrangement

An apparatus for actuating one or more latching arrangements of one or more respective rocker arms of a valve train assembly of an internal combustion engine, each rocker arm comprising a first body, a second body for pivotal motion with respect to the first body, and the latching arrangement, the latching arrangement being configured to latch and unlatch the first body and the second body, the apparatus comprising:

• a shaft rotatable by an actuation source, from a rest orientation, in a first direction, and rotatable by the actuation source, from the rest orientation, in a second direction opposite the first direction;
• one or more selector cams rotatable by the shaft, each selector cam for being configured to actuate the latching arrangement of a respective rocker arm so as to latch and/or unlatch the first body and the second body;
• and
• a return apparatus configured to return the shaft to the rest orientation, the return apparatus comprising:
• one or more radial protrusions protruding radially out from the shaft;
• a reaction body;
• and
• a biasing means configured to contact the reaction body and the one or more radial protrusions;
• wherein the return apparatus is configured such that, in use:
• when the shaft is in the rest orientation the biasing means is configured to apply substantially no rotational force to the shaft,
• when the shaft is rotated from the rest orientation in the first direction the biasing means is configured to contact the reaction body and one or more of the radial protrusions so as to bias the shaft rotationally in the second direction to towards the rest orientation, and
• when the shaft is rotated from the rest orientation in the second direction the biasing means is configured to contact the reaction body and one or more of the radial protrusions so as to bias the shaft rotationally in the first direction to towards the rest orientation.