Fluid actuated timing mechanism

Details Fluid actuated timing mechanism Fluid actuated timing mechanism

1974-04-04

1978-05-30

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9018, F01L 134, F01L 124

Patent

active

040917762

ABSTRACT:
A timing mechanism actuated by hydraulic fluid uses a means responsive to vacuum to relatively displace a drive member and a driven member. When incorporated in an internal combustion engine for advancing or retarding an engine camshaft with respect to an engine crankshaft, the relative displacement is selectively controlled to reduce smog-producing exhaust emission and improve engine performance and fuel economy. In the preferred embodiment, the drive member and driven member form a fluid pressure chamber therebetween and the vacuum responsive means regulates the hydraluic fluid in said chamber. A vacuum control means which is responsive to engine operating conditions governs the application of vacuum to the vacuum responsive means. When engine operating conditions are at certain specified levels, a signal is transmitted to actuate the vacuum control means to allow the application of vacuum to the vacuum responsive means. With the application of sufficient vacuum, the vacuum responsive means allows hydraulic fluid into the chamber whereby the drive member and driven member are relatively displaced.

REFERENCES:
patent: 2159017 (1939-05-01), Duncan
patent: 2162243 (1939-06-01), Browne
patent: 2708353 (1955-05-01), Brady
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patent: 2888000 (1959-05-01), Winkler
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patent: 3626720 (1971-12-01), Meacham
patent: 3685499 (1972-08-01), Meacham
patent: 3721220 (1973-03-01), Garcea
patent: 3827413 (1974-08-01), Meacham
patent: 3978831 (1976-09-01), Yoshikawa

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