Valve actuating mechanism in four-stroke cycle engine

Details Valve actuating mechanism in four-stroke cycle engine Valve actuating mechanism in four-stroke cycle engine

1991-03-12

1992-05-12

Nelli, Raymond A.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, F01L 134

Patent

active

051117819

ABSTRACT:
A valve actuating mechanism disposed in a four-stroke cycle engine within which exhaust and intake valves are disposed, comprises a rocker shaft rotatably supported upon a cylinder head of an engine unit and having eccentric large-diameter portions formed as bushings upon the rocker shaft, rocker arms including a first rocker arm rotatably mounted directly upon the rocker shaft and second and third rocker arms rotatably mounted upon the bushings with the first rocker arm being interposed therebetween, and a cam assembly including first, second and third cam members which drives the first, second and third rocker arms, respectively. The second and third cams have the same cam profiles and the first cam has a cam profile different from those of the second and third cams. A driving mechanism for rotating the rocker shaft is connected to one end of the rocker shaft and comprises a hydraulic cylinder, a rack connected thereto and a pinion formed upon the one end of the rocker shaft so as to be engaged with the rack from the upper side of the cylinder head. A stopper mechanism for controlling the rotational and sliding position of the rocker shaft is composed of a stopper hole formed within the cylinder head, a stopper screw engaged with the stopper hole and a stopper member disposed upon the other end portion of the rocker shaft.

REFERENCES:
patent: 4397270 (1983-08-01), Aoyama
patent: 4638773 (1987-01-01), Bonvallet
patent: 4643141 (1987-02-01), Bledsoe
patent: 5018487 (1991-05-01), Shinkai
patent: 5025761 (1991-06-01), Chen
Japanese Utility Model Publication No. 55-152308, 1980 (no month provided).

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