Method and appparatus for varying intake and exhaust valve openi

Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing

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Details

123 9048, 123 905, F01L 134, F01L 114

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active

052319601

ABSTRACT:
A modified camshaft and a modified cam follower control valve overlap and vary intake and exhaust valve opening and closing in a reciprocating piston engine. The camshaft and cam follower are modified to cause the intake valve of a piston cylinder to open at top dead center and close at bottom dead center of the intake stroke of a piston. The exhaust valve is caused to open at bottom dead center and close at top dead center to the exhaust stroke of the piston. The modification of a camshaft includes the shaping and spacing of the cam lobes to achieve, in conjunction with a modified cam follower, a desired duration and initiation of valve opening. The modification of the cam follower includes a novel shaping of the lower portion of a cam follower.

REFERENCES:
patent: 1501041 (1924-07-01), Cutler
patent: 1755817 (1930-04-01), Dibley
patent: 1798508 (1938-09-01), Tucker
patent: 2663288 (1953-12-01), Hutchison
patent: 3986351 (1976-10-01), Woods et al.
patent: 4335685 (1982-06-01), Clouse
patent: 4361120 (1982-11-01), Kueny
patent: 4583498 (1986-04-01), Magnet
patent: 4869215 (1989-09-01), Parsons

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