Dual follower variable valve timing mechanism

Details Dual follower variable valve timing mechanism Dual follower variable valve timing mechanism

1983-02-22

1984-09-04

Cline, William R.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9048, F01L 134

Patent

active

044690568

ABSTRACT:
A dual follower variable valve timing mechanism for varying the timing of the intake and exhaust valves of an internal combustion engine. Adjacent sets of angularly offset cams are provided on a rotatable camshaft for actuating each valve of the engine, one cam of the set providing a short duration timing and the other cam of the set providing a long duration timing. A first follower for each set of cams has leading and trailing portions having control surfaces which conjointly engage the respective cams. A second, crescent-shaped follower is pivotally mounted in one end of the rocker arm that actuates the valve and has control surfaces which engage the first follower. Links connect the first follower with a crank which is rotatable in opposite directions by a control mechanism responsive to different operating parameters of the engine.
In another embodiment, the first follower includes spaced pair of leading rollers and a central, trailing roller which engage the cams.
In another embodiment, all of the cams are respectively carried on separate camshafts and engage, convex control surfaces on a crescent-shaped follower. A roller is disposed between a concave control surface on the crescent-shaped follower and a convex surface on a rocker arm. One end of the rocker arm engages the stem of the associated valve and the opposite end of the rocker arm engages a lash adjuster.

REFERENCES:
patent: 2266077 (1941-12-01), Roan
patent: 2410411 (1946-11-01), Gregory
patent: 2851851 (1958-09-01), Smith
patent: 3157166 (1964-11-01), MacNeill
patent: 4138973 (1979-02-01), Luria
patent: 4204512 (1980-05-01), Brock, Jr.
patent: 4261307 (1981-04-01), Oldberg

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