A valvetrain assembly comprises a deactivatable rocker arm where a pushrod is configured to transfer a valve lift profile through to a valve end to a valve or valve bridge. A castellation assembly in a carrier and alternative two-piece rocker arm assemblies with rotary or linear actuators are shown for deactivating the transfer of the valve lift profile.

The disclosure relates to a charging system, which includes a crankshaft chamber, two cylinder chambers, a crankshaft connecting rod mechanism, two pistons, an intake pipe, two draft tubes, and a rotating rod control mechanism. The crankshaft connecting rod mechanism is installed in the crankshaft chamber. Each piston is received in the cylinder chambers and connected with the crankshaft connecting rod mechanism. The intake pipe only communicates with the crankshaft chamber. One end of each draft tube only communicates with the crankshaft chamber and another end only communicates with each cylinder chamber. The check valve is installed in the crankshaft chamber. The rotating rod control mechanism includes a rotating rod and a sealing block fixedly connected and rotating with the rotating rod. The sealing block blocks and seals a joint between the crankshaft chamber and each draft tube.

The disclosure relates to a charging system, which includes a crankshaft chamber, two cylinder chambers, a crankshaft connecting rod mechanism, two pistons, an intake pipe, two draft tubes, and a rotating rod control mechanism. The crankshaft connecting rod mechanism is installed in the crankshaft chamber. Each piston is received in the cylinder chambers and connected with the crankshaft connecting rod mechanism. The intake pipe only communicates with the crankshaft chamber. One end of each draft tube only communicates with the crankshaft chamber and another end only communicates with each cylinder chamber. The check valve is installed in the crankshaft chamber. The rotating rod control mechanism includes a rotating rod and a sealing block fixedly connected and rotating with the rotating rod. The sealing block blocks and seals a joint between the crankshaft chamber and each draft tube.

A rocker arm can comprise a first outer arm and a second outer arm joined by a pivot body. An actuatable latch mechanism is within the pivot body. An inner arm assembly comprises a latch arm. A first spring prop is on the inner arm assembly distal from the latch arm. An axle joins the inner arm assembly to pivot between the first outer arm and the second outer arm. A spring is biased against the first outer arm and against the first spring prop. The first spring prop can comprise a hooked end. Or, the first spring prop can extend laterally out from the rocker arm and parallel to the axle. The spring can comprise a one-piece spring comprising first and second coil springs connected by a lateral connector. Or, two separate torsion springs can comprising tangential spring ends extending at approximately 90 degrees.

Systems, devices, and methods are disclosed that during cylinder deactivation, including skipfire, at low engines speeds and low engine loads maintain adequate oil pressure of valvetrain components or hardware required for CDA and/or skipfire operation.

Methods and systems are provided for actuating an advanced cam profile switch (CPS) assembly. In one example, a system may include a first cylinder and a second cylinder of the CPS assembly that may be independently coupleable to a valve stem via two separate locking mechanisms. A first cam may be selectively engage with the first cylinder and the valve stem and a second cam may be selectively engaged with the second cylinder and the valve stem.

A cam follower is provided. The cam follower includes a polycrystalline diamond element, including an engagement surface. The engagement surface of the polycrystalline diamond element is positioned on the cam follower for sliding engagement with an opposing engagement surface of a cam. The cam includes at least some of a diamond reactive material.

An internal combustion engine includes an engine block, a piston, a cylinder head, and a valve train. The engine block includes a cylinder block including a cylinder bore and a crankcase defining a crankcase chamber with a crankshaft positioned within the crankcase chamber. The piston is coupled to the crankshaft and configured to reciprocate within the cylinder bore. The cylinder head is coupled to the cylinder block. The valve train includes a camshaft, a first and second pushrod, a first and second rocker arm, an exhaust valve housed, and an intake valve. The first rocker arm, the second rocker arm, the exhaust valve, and the intake valve each include at least a layer of a low friction material. The first and second pushrod each pass through a pushrod seal to prevent fluid from reaching the rocker chamber to fluidly isolate the rocker chamber from the crankcase chamber.

A lifter assembly can comprise an outer body comprising an oil port and opposed latch ports. An inner body can comprise a roller assembly or tappet configured to lift and lower to follow a cam. The inner body comprises a pin passage comprising an inner diameter. A pin assembly is mounted in the pin passage. The pin assembly comprises a bushing abutting the inner diameter. The bushing comprises a pin port. A pin comprises a rim and a narrow end configured for sliding in the pin port.

A lifter assembly can comprise an outer body comprising an oil port and opposed latch ports. An inner body can comprise a roller assembly or tappet configured to lift and lower to follow a cam. The inner body comprises a pin passage comprising an inner diameter. A pin assembly is mounted in the pin passage. The pin assembly comprises a bushing abutting the inner diameter. The bushing comprises a pin port. A pin comprises a rim and a narrow end configured for sliding in the pin port.