Suzuki Kabushiki Kaisha

Tatsuya Shinkai

Kazuhiko Suzuki

Younosuke Yokogi

Shinji Kaku

A valve actuating mechanism is disposed within a four-stroke cycle engine and comprises a rotatable rocker shaft having eccentric large-diameter portions formed as bushings upon the rocker shaft, a rocker arm assembly including a first rocker arm rotatably mounted directly upon the rocker shaft and second and third rocker arms rotatably muonted upon the eccentric bushings of the rocker shaft with the first rocker arm being interposed between the second and third rocker arms, and a cam assembly including first, second and third cam members which drives the first, second and third rocker arms, respectively. The first rocker arm is provided with a branched distal end and the second and third rocker arms are each provided with a distal end which is laid upon each of the distal ends of the first rocker arm. The second and third cams have the same cam profile and the first cam has a cam profile which is different from that of the second and third cams. A play adjusting screw means is provided for either one of the support portions of the first rocker arm and the second and third rocker arms and a screw receiving portion is provided upon the other one of the support portions of the first rocker arm and the second and third rocker arms in such a manner that a clearance is defiend between a distal end of the play adjusting means and the screw receiving portion is adjusted.

Valve actuating mechanism in four-stroke cycle engine

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.

Growing community of inventors

Hamamatsu, Japan

Tatsuya Shinkai