Device for varying engine valve timing

Details Device for varying engine valve timing Device for varying engine valve timing

1987-07-13

1988-07-05

Lazarus, Ira S.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, 123 9031, F01L 134

Patent

active

047547278

ABSTRACT:
A device for angularly displacing a camshaft relative to the crankshaft of an internal combustion engine to vary engine valve timing. The device comprises a hub fixed to the camshaft, an annular means threadedly engaged with the hub or with an advancing member mounted on the outer surface of the annular means. Angled lugs formed on a drive member coact with angled slots formed on the outer periphery of the advancing member. The amount of angular displacement of the drive member relative to the hub and camshaft is directly proportional to the axial displacement of the advancing member which in turn is moved axially as the annular means is moved axially along the threads on the hub or on the advancing member. The latter movement is effected by applying a retarding or braking torque to the annular means.

REFERENCES:
patent: 3827413 (1974-08-01), Mecham
patent: 4091776 (1978-05-01), Clemens et al.
patent: 4305352 (1981-12-01), Oshima et al.
patent: 4545338 (1985-10-01), Alfred, III
patent: 4708101 (1987-11-01), Hara et al.

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