A valvetrain includes a rocker arm assembly having an electromagnetic latch housed in a chamber formed by a rocker arm. The chamber may be a retrofit hydraulic chamber. A flux shifting bi-stable latch provides a sufficiently compact design. Isolation of the magnetic elements within the rocker arm chamber may provide protection from metal particles carried by oil in an operating environment for the rocker arm assembly. Wiring connections to the rocker arms may be made through spring posts on the rocker arms. Connection to the rocker arms may be made with springs that can endure the rapid motion induced by the rocker arms. A wiring harness for the rocker arms may attach to hydraulic lash adjusters of the rocker arm assemblies. The rocker arm assemblies and their wiring may be formed into a unitary module that facilitates installation.

Linear actuators are disclosed. The linear actuator comprises a thruster and a stator. The thruster includes a thruster winding, and the stator includes a stator winding. The stator is disposed about the thruster. The linear actuator also includes a sheath disposed about the stator and the thruster. The thruster is configured to translate within the sheath relative to the stator upon application of an electrical current to the stator winding, the thruster winding, or a combination thereof. The stator winding and the thruster winding each comprise a nonpermanent magnet.

A housing of an exhaust valve is provided for an exhaust port communicating with a combustion chamber. The housing has a plate-shaped portion formed with a plurality of fixed slits radially extending from the central axis of the port. A valve element is provided adjacent to the plate-shaped section, is rotatable around a central axis, and has formed with a plurality of movable slits radially extending from the central axis. Due to the action of electromagnets and a permanent magnet attached to an annular member, the valve body is rotationally displaced around the central axis of the port, and the relative positional relationship between the fixed slits and the movable slits is changed to open and close the exhaust valve. The same is also true for an intake valve.

A housing of an exhaust valve is provided for an exhaust port communicating with a combustion chamber. The housing has a plate-shaped portion formed with a plurality of fixed slits radially extending from the central axis of the port. A valve element is provided adjacent to the plate-shaped section, is rotatable around a central axis, and has formed with a plurality of movable slits radially extending from the central axis. Due to the action of electromagnets and a permanent magnet attached to an annular member, the valve body is rotationally displaced around the central axis of the port, and the relative positional relationship between the fixed slits and the movable slits is changed to open and close the exhaust valve. The same is also true for an intake valve.

Linear actuators are disclosed. The linear actuator comprises a thruster and a stator. The thruster includes a thruster winding, and the stator includes a stator winding. The stator is disposed about the thruster. The linear actuator also includes a sheath disposed about the stator and the thruster. The thruster is configured to translate within the sheath relative to the stator upon application of an electrical current to the stator winding, the thruster winding, or a combination thereof. The stator winding and the thruster winding each comprise a nonpermanent magnet.

A head assembly for an internal combustion engine includes an electromagnetic valve actuation system. The head has an intake or exhaust passage defined therein. A valve is disposed in the passage and is operable to selectively open and close the passage. The head has a cooling passage defined therein for passage of a cooling fluid. An electromagnetic actuator has a piston in mechanical communication with the valve and a coil in fluid communication with the cooling passage. The electromagnetic actuator is operable to move the valve between a closed and an open position.

A valvetrain includes a rocker arm assembly having an electromagnetic latch housed in a chamber formed by a rocker arm. The chamber may be a retrofit hydraulic chamber. A flux shifting bi-stable latch provides a sufficiently compact design. Isolation of the magnetic elements within the rocker arm chamber may provide protection from metal particles carried by oil in an operating environment for the rocker arm assembly. Wiring connections to the rocker arms may be made through spring posts on the rocker arms. Connection to the rocker arms may be made with springs that can endure the rapid motion induced by the rocker arms. A wiring harness for the rocker arms may attach to hydraulic lash adjusters of the rocker arm assemblies. The rocker arm assemblies and their wiring may be formed into a unitary module that facilitates installation.

A stator assembly for receiving at least two rotors. The assembly comprises at least two individual stators which are divided into stator segments, with at least one segment being a shared segment which forms part of at least two adjacent individual stators. An engine valve actuation assembly includes a stator assembly comprising at least two individual stators. Each individual stator comprises a peripheral portion extending around the longitudinal axis of the stator, with part of the peripheral portion of each stator forming part of the peripheral portion of an adjacent individual stator. Methods for assembling a stator assembly are also described.

Methods and systems are provided for a latchable refueling valve designed to reduce noise associated with opening and closing the valve. In one example, a system may include a valve armature with first and second latch indices formed on an outer diameter of the armature. The latch indices may be rounded and configured to engage with a latch guide to enable rotation between the armature and the latch guide.

Methods and systems are provided for a latchable refueling valve designed to reduce noise associated with opening and closing the valve. In one example, a system may include a valve armature with first and second latch indices formed on an outer diameter of the armature. The latch indices may be rounded and configured to engage with a latch guide to enable rotation between the armature and the latch guide.