Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1990-02-13
1991-09-17
Okonsky, David A.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9024, 123 9039, F01L 130
Patent
active
050484745
ABSTRACT:
In a valve train for an I.C. engine, a cam shaft has cams formed with compound curvatures which allow the valve timing to be altered while the engine is operating, to suit the engine driving conditions by shifting the cam shaft along its axis. To reduce the force necessary to shift the cam shaft along its axis the valve closure springs are replaced by closure cams. In some embodiments pivoting arrangements comprising a pair of ball and socket joints are provided to eliminate lateral sway of the rocker arms allowing precise adjustment of the valve timing when the cam shaft is shifted along its axis. In other embodiments the rocker arms are journalled on a rocker shaft provided with stops for preventing lateral sway. In some embodiments the closure rocker arms have cupped ends in which either the valve stem retainer or the valve stem seal is received.
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Kamegaya Shigeru
Komatsu Hiroshi
Matayoshi Yutaka
Okawa Kozaburo
Sakuragi Shigeru
Lo Weilun
Nissan Motor Co,. Ltd.
Okonsky David A.
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