Internal combustion engine having variable event timing

Details Internal combustion engine having variable event timing Internal combustion engine having variable event timing

1993-03-11

1994-03-29

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 1, 74568R, F01L 112

Patent

active

052975070

ABSTRACT:
An internal combustion engine has a crankshaft, a camshaft driven by the crankshaft through a drivewheel at half the crankshaft speed and at least one cam on the camshaft for actuating a spring-biased poppet valve. To achieve variable event timing, a lost motion coupling is arranged between the drive wheel and the camshaft. During the opening of the valve, the camshaft rotates at substantially the same speed as the drive wheel, but during the closing of a valve, the camshaft is accelerated by the valve spring to lead the drive wheel and thereby reduce the duration of the valve event. It is alternatively possible to collapse the opening phase of the valve event rather than the closing phase by reversing the operation of the coupling.

REFERENCES:
patent: 5095857 (1992-03-01), Hampton et al.
patent: 5181484 (1993-01-01), Kan et al.
patent: 5181486 (1993-01-01), Gyurovits
patent: 5219313 (1993-06-01), Danieli

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