Variable-timing valve actuating mechanism

Details Variable-timing valve actuating mechanism Variable-timing valve actuating mechanism

1983-05-16

1986-05-13

Cline, William R.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9044, F01L 108

Patent

active

045879346

ABSTRACT:
A variable-timing valve actuating mechanism for an internal combustion engine having an axially movable cam shaft, movable by a governor device to a position proportional to engine rpm. A set of dual cams is provided for operating intake and exhaust valves with a uniform profile lobe effective only over an idle to medium rpm range and a non-uniform profile lobe effective only over a medium to maximum rpm range. A timing gear drives the cam shaft and utilizes a spiral spine drive to also advance and retard the cam shaft rotation proportional to the cam shaft axial position. The variable advance/retard action and the non-uniform cam lobe are selected to optimize valve overlap, valve opening angle, and valve timing as a function of rpm.

REFERENCES:
patent: 1691991 (1928-11-01), Puckett
patent: 2060580 (1936-11-01), La Chapelle
patent: 2980089 (1961-04-01), Sampietro
patent: 3401572 (1968-09-01), Bailey
patent: 3481314 (1969-12-01), Crenn
patent: 4151817 (1979-05-01), Mueller

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