Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1995-12-21
1997-02-18
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9048, F01L 1300
Patent
active
056032943
ABSTRACT:
A variable valve lift device includes an outer cam; an inner cam having a base circle and a nose smaller than the base circle and the nose of the outer cam; at least one of an intake and exhaust valve opened and closed by being moved in the axial direction thereof, the valve being biased in the closing direction; an outer lifter biased in a direction which brings it into contact with the outer cam, the outer lifter being provided in an engine head; an inner lifter in abutting contact with an upper end face of the valve and having a groove in an outer periphery thereof; a plate slidable in a direction which perpendicularly intersects the axis of the valve, the plate moving together with the outer lifter; and control means for moving the plate in the direction which perpendicularly intersects the axis of the valve. The control means is capable of selecting a high-lift mode in which the plate is moved to a position at which it engages with the groove to thereby open/close the valve in a state of high lift, and a low-lift mode in which the plate is moved to a position at which it does not engage with the groove to thereby open/close the valve in a state of low lift.
REFERENCES:
patent: 5090364 (1992-02-01), McCarroll et al.
patent: 5253621 (1993-10-01), Dopson et al.
patent: 5343833 (1994-09-01), Shirai
patent: 5431133 (1995-07-01), Spath et al.
patent: 5488934 (1996-02-01), Shirai et al.
Aisin Seiki Kabushiki Kaisha
Lo Weilun
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