Abstract: A center pivot roller rocker arm assembly can comprise a main roller rocker arm, a second roller rocker arm, and a latching assembly. The main roller rocker arm can comprise a rocker shaft bore, a valve end, a cam end, and a main cam surface on the cam end. The second roller rocker arm can comprise a second rocker shaft bore, a second cam end, and a second cam surface on the second cam end. The latching assembly can be coupled to the rocker shaft bore and configured to latch and unlatch the main roller rocker arm to the second roller rocker arm. A lost motion assembly can be configured with the main and second roller rocker arms. A main cam surface can have a different extent for receiving cam actuation than a second cam surface.

Abstract: A rocker arm assembly can comprise a rocker arm. A rocker shaft comprises a channel and an oil path enclosed in the rocker shaft. The oil path is configured to supply hydraulic pressure within the rocker shaft to the channel. Rotation-locking mechanism comprises a locking pin or pressure pin configured to slide in the channel. The oil path is configured to supply oil pressure to the locking pin or pressure pin within the rocker shaft. The locking pin can be configured to slide in the channel between a locked position, where the locking pin abuts a groove, and an unlocked position, where the locking pin is withdrawn into the channel. Or, a locking pin can be configured to slide in the rocker arm between a locked position abutting the locking groove and an unlocked position where the locking pin is withdrawn into the rocker arm.

Abstract: A castellation assembly can comprise a first toothed body comprising a first toothed end and a biased end comprising a projecting lever. The projecting lever can be configured to extend out from the biased end and contact an actuation lever throughout a travel of the first toothed body. The second toothed body can comprise a base and a second toothed end configured to mesh between or stack against the first toothed end. A castellation spring can be configured to push the first and second toothed body apart. An actuator assembly can actuate the castellation assembly and comprise an actuating lever assembly configured to reciprocate between a contacting position against the projecting lever and a clearance position spaced from the projecting lever. A rocker arm in a valvetrain can be controlled for variable valve actuation thereby.

Abstract: A shifting stopper latch assembly for a rocker arm can comprise a latch assembly housing, comprising a latch assembly oil feed, a piston bore, a stopper bore comprising a stopper opening, and a spring seat. A piston can be in the piston bore. A shifting stopper can be in the stopper bore and the shifting stopper can comprise a projection protruding out of the stopper opening. A return spring can be configured in the spring seat to bias the shifting stopper and the plunger away from the spring seat and towards the latch assembly oil feed. A valvetrain can comprise a rocker arm configured to actuate against a cam on a cam rail, and the rocker arm can comprise a latch surface configured to selectively engage and disengage the projection.

Abstract: A rocker arm assembly can comprise a rocker arm. A rocker shaft comprises a channel and an oil path enclosed in the rocker shaft. The oil path is configured to supply hydraulic pressure within the rocker shaft to the channel. Rotation-locking mechanism comprises a locking pin or pressure pin configured to slide in the channel. The oil path is configured to supply oil pressure to the locking pin or pressure pin within the rocker shaft. The locking pin can be configured to slide in the channel between a locked position, where the locking pin abuts a groove, and an unlocked position, where the locking pin is withdrawn into the channel. Or, a locking pin can be configured to slide in the rocker arm between a locked position abutting the locking groove and an unlocked position where the locking pin is withdrawn into the rocker arm.

Abstract: A shifting stopper latch assembly for a rocker arm can comprise a latch assembly housing, comprising a latch assembly oil feed, a piston bore, a stopper bore comprising a stopper opening, and a spring seat. A piston can be in the piston bore. A shifting stopper can be in the stopper bore and the shifting stopper can comprise a projection protruding out of the stopper opening. A return spring can be configured in the spring seat to bias the shifting stopper and the plunger away from the spring seat and towards the latch assembly oil feed. A valvetrain can comprise a rocker arm configured to actuate against a cam on a cam rail, and the rocker arm can comprise a latch surface configured to selectively engage and disengage the projection.

Abstract: A center pivot roller rocker arm assembly can comprise a main roller rocker arm, a second roller rocker arm, and a latching assembly. The main roller rocker arm can comprise a rocker shaft bore, a valve end, a cam end, and a main cam surface on the cam end. The second roller rocker arm can comprise a second rocker shaft bore, a second cam end, and a second cam surface on the second cam end. The latching assembly can be coupled to the rocker shaft bore and configured to latch and unlatch the main roller rocker arm to the second roller rocker arm. A lost motion assembly can be configured with the main and second roller rocker arms. A main cam surface can have a different extent for receiving cam actuation than a second cam surface.

Abstract: A castellation assembly (600) can comprise a first toothed body (601) comprising a first toothed end (611) and a biased end (610) comprising a projecting lever (615). The projecting lever can be configured to extend out from the biased end and contact an actuation lever throughout a travel of the first toothed body. The second toothed body can comprise a base (620) and a second toothed end (621) configured to mesh between or stack against the first toothed end. A castellation spring (630) can be configured to push the first and second toothed body apart. An actuator assembly (40) can actuate the castellation assembly and comprise an actuating lever assembly (50) configured to reciprocate between a contacting position against the projecting lever and a clearance position spaced from the projecting lever. A rocker arm (100) in a valvetrain can be controlled for variable valve actuation thereby.