초록 ▼

A valve control system for an internal combustion engine including a poppet valve (21) and high lift (15) and low lilt (31) cam lobes. A latchable rocker arm includes an outer rocker arm (33) and an inner rocker arm (35), and a slider mechanism (37) which is biased by a spring (67) to the high lilt

A valve control system for an internal combustion engine including a poppet valve (21) and high lift (15) and low lilt (31) cam lobes. A latchable rocker arm includes an outer rocker arm (33) and an inner rocker arm (35), and a slider mechanism (37) which is biased by a spring (67) to the high lilt mode (FIG. 1). An actuator assembly (27) includes and arm (103) biased by a spring (101) into engagement with the slider (37), biasing the slider toward the unlatched (low lift) mode (FIG. 2 ). The actuator (27) includes an electromagnetic coil (83) which moves an armature (87) into engagement with the arm (103), biasing the arm in opposition to the force of the actuator spring (101), but aided initially by the force of the slider spring (67).

대표청구항 ▼

A valve control system for an internal combustion engine including a cylinder head, a poppet valve moveable within the cylinder head between one condition and another condition; and a camshaft including a cam lobe having a cam profile formed thereon; said control system comprising a first rocker arm

A valve control system for an internal combustion engine including a cylinder head, a poppet valve moveable within the cylinder head between one condition and another condition; and a camshaft including a cam lobe having a cam profile formed thereon; said control system comprising a first rocker arm mounted relative to the cylinder head for rotation about an axis; a second rocker arm mounted relative to the cylinder head for rotation about said axis, one of said rocker arms being engageable with said poppet valve and one of said rocker arms having a cam follower element thereon engageable with said cam lobe; and latch means operable, in response to movement in a direction perpendicular to said axis, to a first position, to achieve mutual engagement of said first and second rocker arms, for rotation in unison about said axis, and to a second position, wherein said rocker arms are free to rotate relative to one another; an actuator assembly operable, in response to an electrical input signal, to cause said movement of said latch means; characterized by: (a) said actuator assembly including a housing and an arm member adapted for engagement with said latch means, and means biasing said arm member away from a first position, and toward a second position corresponding to said second position of said latch means; (b) said actuator assembly including an electromagnetic coil adapted to receive said electrical input signal, and an axially moveable armature having a retracted position and an extended position, one of said positions occurring in response to said electrical input signal; and (c) in said position of said armature occurring in response to said electrical input signal, said armature biases said arm member toward said first position in opposition to the force of said biasing means.