Apparatus and system comprising integrated master-slave pistons for actuating engine valves

A system for actuating first and second engine valves associated with an engine cylinder, comprising:

• a rocker arm shaft;
• a primary valve actuation motion source;
• an auxiliary valve actuation motion source;
• a rocker arm disposed on the rocker arm shaft, configured to actuate the first and second engine valves and further configured, at a motion receiving end of the rocker arm, to receive motion from the primary valve actuation motion source;
• a master piston disposed in a master piston bore at a portion of the motion receiving end of the rocker arm separate from that portion of the motion receiving end of the rocker arm configured to receive motion from the primary valve actuation motion source and configured, at an end of the master piston extending out of the master piston bore, to receive motion from the auxiliary valve actuation motion source;
• a slave piston disposed in a slave piston bore at a valve actuation end of the rocker arm opposite the motion receiving end of the rocker arm, the slave piston configured to provide auxiliary valve actuation motion to only the first of the first and second engine valves;
• an hydraulic circuit within the rocker arm;
• and
• a check valve disposed in the rocker arm and configured to supply hydraulic fluid to the hydraulic circuit,
• wherein the hydraulic circuit connects the master piston bore and the slave piston bore.