Rocker shaft with de-aeration oil gallery segment

A switchable valve train assembly comprising:

• a carrier housing defining a hydraulic circuit, the carrier housing including rocker shaft support regions and a supply assembly support region;
• a supply assembly connected to the supply assembly support region of the carrier housing including a pressurized fluid source for providing pressurized hydraulic fluid to the hydraulic circuit, and a solenoid and a control valve for selectively supplying the pressurized hydraulic fluid to the hydraulic circuit;
• a hydraulic lash adjuster feed channel defined by the hydraulic circuit in fluid connection with the pressurized fluid source;
• a switch channel defined by the hydraulic circuit in fluid connection with the control valve;
• a plurality of rocker shafts supported on the rocker shaft support regions of the carrier housing, each one of the plurality of rocker shafts including a central space with one or more chambers defined by a radially inner surface;
• a plurality of separators each secured in the central space of a respective one of the plurality of rocker shafts, and a radially outer surface of each one of the plurality of separators engages the radially inner surface of a respective one of the plurality of rocker shafts,
• each one of the plurality of separators divides the central space of the each one of the rocker shafts into (1) a first chamber extending between a first chamber axial end and the separator, and (2) a second chamber extending between a second chamber axial end and the separator, the plurality of separators each include an orifice defined between the first chamber and the second chamber providing fluid connection between the first chamber and the second chamber,
• wherein the hydraulic lash adjuster feed channel is in fluid communication with the first chambers of each one of the plurality of rocker shafts via the hydraulic circuit;
• wherein the switch channel is in fluid communication with the second chambers of each one of the plurality of rocker shafts via the hydraulic circuit;
• and
• a plurality of rocker arm assemblies each arranged on a respective one of the plurality of rocker shafts, each one of the plurality of rocker arm assemblies includes a hydraulic lash adjuster connected to a first intake port and a locking assembly connected to a second intake port, the first chamber of each one of the plurality of rocker shafts includes a first actuator port in fluid connection with a respective one of the first intake ports for the hydraulic lash adjuster, and the second chamber of each one of the plurality of rocker shafts includes a second actuator port in fluid connection with a respective one of the second intake ports for the locking assembly.