Internal-combustion engines – Poppet valve operating mechanism – Overhead camshaft
Patent
1991-10-30
1993-02-09
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
Overhead camshaft
123 9022, 123308, F01L 126
Patent
active
051845806
ABSTRACT:
A timing system, in particular for high performance internal combustion engines, having five or more valves per cylinder, is described. Three identical valves serving a given cylinder of an engine are controlled by a single camshaft by means of a pair of corresponding cams which act together with a pair of tappets which are mounted slidably in corresponding guides in the cylinder head. The tappets act together at the edges with corresponding valve stems of the three valves which are slidably mounted within second guides within the cylinder head, against the force of corresponding elastic means in a radially eccentric position with respect to the axis of the tappets in such a way that the valve stem of the intermediate valve acts simultaneously with both tappets, while the valve stems of the two lateral valves each act together with a corresponding different tappet in positions of mirror-image symmetry with respect to the center plane of the cylinder passing through the axis of the intermediate valve.
REFERENCES:
patent: 3712277 (1973-01-01), Piatti
patent: 4658780 (1987-04-01), Hosoi
patent: 4805567 (1989-02-01), Heimburg
patent: 4915065 (1990-04-01), Yamada
patent: 5094197 (1992-03-01), Rosa
patent: 5095858 (1992-03-01), Ascari
Cross E. Rollins
Ferrari S.p.A.
Lo Weilun
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