Castellation mechanism with reverse reset

A valvetrain assembly comprising:

• a first engine valve;
• a second engine valve;
• a valve bridge operatively associated with the first and second engine valves;
• and
• a rocker arm assembly comprising:
• a rocker arm rotatably coupled to a rocker shaft, the rocker arm defining a first bore and a second bore;
• a lost motion spigot assembly at least partially disposed within the first bore, the lost motion spigot assembly configured to selectively engage the valve bridge so as to actuate the first and second engine valves, the lost motion spigot assembly comprising:
• a guide;
• a shaft extending through the guide;
• and
• a lost motion biasing mechanism seated between the guide and an inner wall of the rocker arm defining the first bore;
• a reverse reset capsule assembly (RRCA) at least partially disposed within the second bore, the RRCA configured to be switched between (i) a locked position which engages only the second valve so as to perform one of a late intake valve closing (LIVC) operation and an internal exhaust gas recirculation (iEGR) operation, and (ii) an unlocked position so as to perform neither the LIVC operation nor the iEGR operation;
• and
• an actuator assembly at least partially disposed within a third bore formed in the rocker arm, the actuator assembly configured to selectively switch the RRCA between the first and second positions.

A rocker arm assembly operable to selectively open first and second engine valves of an engine in an engine drive mode and at least one of a late intake valve closing (LIVC) mode and an internal exhaust gas recirculation (iEGR) mode, the rocker arm assembly comprising:

• a rocker arm configured to rotate about a rocker shaft, the rocker arm defining a bore;
• a lost motion spigot assembly at least partially disposed within the bore, the lost motion spigot assembly comprising:
• a guide;
• a shaft extending through the guide;
• and
• a lost motion biasing mechanism seated between the guide and an inner wall of the rocker arm defining the bore;
• a reverse reset capsule assembly (RRCA) configured to be switched between (i) a locked position so as to perform one of an LIVC operation and an iEGR operation, and (ii) an unlocked position so as to perform neither the LIVC operation nor the iEGR operation;
• and
• an actuator assembly configured to selectively switch the RRCA between the locked and unlocked positions.

A rocker arm assembly operable to selectively open first and second engine valves of an engine in an engine drive mode and at least one of a late intake valve closing (LIVC) mode and an internal exhaust gas recirculation (iEGR) mode, the rocker arm assembly comprising:

• a rocker arm configured to rotate about a rocker shaft, the rocker arm defining a bore;
• a reverse reset capsule assembly (RRCA) disposed within the bore, the RRCA configured to be switched between (i) a locked position so as to perform one of an LIVC operation and an iEGR operation, and (ii) an unlocked position so as to perform neither the LIVC operation nor the iEGR operation, the RRCA comprising:
• a retainer;
• a lash adjustment screw;
• a first castellation member;
• a second castellation member operatively associated with the first castellation member;
• a castellation shaft extending through the retainer, the lash adjustment screw, and the first and second castellation members;
• a castellation biasing mechanism disposed between the first and second castellation members and configured to bias the first and second castellation members apart from each other;
• and
• a castellation nut coupled to the lash adjustment screw such that the castellation shaft is configured to slide within the lash adjustment screw;
• and
• an actuator assembly configured to selectively switch the RRCA between the locked and unlocked positions.