Abrégé

An electromagnetically actuated valve assembly (1) for an internal combustion engine comprises a housing (10) inside of which is a tubular linear electric motor (12) with a central axis (18) and, extending along the axis, an elongate armature body (20) that comprises an elongate main portion that is configured to move in opposite first and second axial directions (41, 42) and a poppet valve (40) having a valve stem and a valve head (46). An armature bearing (45) is configured for sliding motion of the armature body relative to the housing. A controller (16) controls the operation of the linear electric motor (12) to move axially and thereby lift and lower the valve head with respect to a valve seat (48) to open and close a valve (2, 4). A coil spring (51) exerts a force on the armature body in the second direction (42). The linear electric motor comprises a fixed winding pack and a magnet pack with an array of alternating permanent magnets within the armature body main portion. The valve assembly further comprises within the housing a solenoid actuator (14) comprising a solenoid winding (70) and a solenoid armature (60), the solenoid winding being fixed relative to the housing (1) and the solenoid armature (60) being fixed relative to an end of the main portion of the armature body and comprising a magnetic material. The controller is connected to the solenoid winding and is configured, when the poppet valve is to move in the second direction to close the cylinder valve, to energise the solenoid winding and thereby actuate the solenoid armature to move in the second direction and close the cylinder valve.

Classes IPC  ?

• F01L 9/20 - Systèmes de distribution à soupapes, à commande non mécanique par des moyens électriques
• F01L 9/21 - Systèmes de distribution à soupapes, à commande non mécanique par des moyens électriques actionnés par des solénoïdes
• H02K 33/16 - Moteurs avec un aimant, un induit ou un système de bobines à mouvement alternatif, oscillant ou vibrant avec des induits polarisés se déplaçant dans des directions opposées par inversion de la tension appliquée au système à une seule bobine
• H02K 41/03 - Moteurs synchronesMoteurs pas à pasMoteurs à réluctance