초록 ▼

An electromagnetically operating actuator includes a casing (29) that accommodates an armature (30), a valve-closing electromagnet (32), a valve-opening electromagnet (32), and a valve-opening spring (33). The casing is fixed to an upper face of a cylinder head (21) in which an intake valve (23) and

An electromagnetically operating actuator includes a casing (29) that accommodates an armature (30), a valve-closing electromagnet (32), a valve-opening electromagnet (32), and a valve-opening spring (33). The casing is fixed to an upper face of a cylinder head (21) in which an intake valve (23) and a valve litter (27) are slidably moveable. A valve-closing spring (28) is installed between the valve lifter and a bottom face of a retention hole (21a). Further, a transmission cam (46) with first and second cam surfaces (51, 52) is interposed between the valve lifter and a tappet (39) connected with the center of the armature through a tappet shaft (38). The transmission cam is pivotable upward and downward. A hydraulic lash adjuster (47) associated with the transmission cam is disposed within the casing. This arrangement can prevent the intake and/or exhaust valves from abruptly moving at the opening and closing timings, to reduce strike and abrasion noise and to improve mountability of the actuator relative to an engine.

대표청구항 ▼

[ What is claimed is:] [1.] An electromagnetically operating actuator including an armature having a tappet associated with intake and/or exhaust valves of an engine, valve-opening and valve-closing electromagnets attracting the armature to open and close the intake and/or exhaust valves, and valve-

[ What is claimed is:] [1.] An electromagnetically operating actuator including an armature having a tappet associated with intake and/or exhaust valves of an engine, valve-opening and valve-closing electromagnets attracting the armature to open and close the intake and/or exhaust valves, and valve-opening and valve-closing spring members biasing the intake and/or exhaust valves in the opening direction and the closing direction to retain the intake and/or exhaust valves in neutral positions, comprising:a transmission mechanism for transmitting force from the tappet to the intake and/or exhaust valves to open and close the intake and/or exhaust valves, said transmission mechanism including a pivotally movable transmission cam interposed between a valve stem of each of the intake and/or exhaust valves, and the tappet, which is associated with the armature and in opposed relation to the valve stem substantially along a direction of movement of the valve stem, the transmission cam having a second cam surface that receives the force from the tappet and a first cam surface that transmits the force to the valve stem.