Rocker arm with integrated gear train

A switchable rocker arm that is switchable between hi-lift, low-lift, and no-lift modes comprising:

• first and second arms, the first arm has a first outer end and a first inner end and the second arm has a second outer end a second inner end, the first outer end being adapted to contact one of a cam or a valve, and the second outer end being adapted to contact the other of the valve or the cam;
• one of the first and second inner ends including an opening with a ring gear and the other of the first and second inner ends including at least one support for at least one planet gear that engages the ring gear;
• a sun gear located on a rocker shaft and engages the at least one planet gear, a gear ratio formed by the sun gear, ring gear, and the at least one planet gear is less than 1:1 to provide the hi-lift mode;
• a locking mechanism that is switchable from a locked position in which the sun gear is rotationally fixed to the rocker shaft to transfer a cam lift to the valve in the high-lift mode, and a release position in which the sun gear is rotatable on the rocker shaft such that a cam lift is not transferred to the valve to provide the no-lift mode;
• and
• a coupling pin arrangement arranged to engage the first and second arms together that is movable between an unlocked position, in which the hi-lift and no-lift modes are carried out, and a locked position, in which the first and second arms are locked together to rotate in unison about the rocker shaft to provide a low-lift mode in conjunction with the locking mechanism being in the release position such that the sun gear is rotatable on the rocker shaft.