Honda Giken Kogyo Kabushiki Kaisha

Adv Antest Corporation

Hideki Saito

Chihaya Sugimoto

Shigemasa Kajiwara

Susumu Toki

Izumi Sugiyama

Masakazu Kinoshita

Kazuo Sakurahara

Nobuyuki Yajima

Kunio Takeuchi

Kazuhiko Akutsu

Takeyuki Yanagi

The object of the present invention is to concentrate the intake air flowing into a combustion chamber of an internal combustion engine near the ignition point of a spark plug, and to form a strong swirl effect in this area. A projection 16 is formed on an end surface 5a of a piston 5. Projection 16 is positioned near an intake port disposed on one side of the upper surface of a combustion chamber. A cavity 17 is formed at a position closer to an exhaust port than projection 16. An ignition point of a spark plug is disposed above cavity 17. The intake port points toward the outer perimeter of the combustion chamber. The portion of projection 16 on piston end surface 5a that lies in the direction of the intake port is cut away. An intake flow passage 19 is formed on end surface 5a of piston 5, extending from a cut-away section 18 toward the exhaust port via the outer perimeter of piston end surface 5a. The end of intake flow passage 19 toward the exhaust port forms a cavity entry 20 through which intake air flows into the cavity 17. The intake air entering the combustion chamber from the intake port goes through cut-away section 18 of projection 16, through the outer perimeter portion of piston end surface 5a, and into cavity 17 from entry 20 toward the exhaust port. A swirling effect is formed in cavity 17.

Piston for internal combustion engines

Test head for semiconductor tester

A valve operating mechanism for an internal combustion engine for varying the operation of the valve dependent on engine operating conditions. A first rocker arm movable to follow a first cam and a second rocker arm movable to follow a second cam corresponding to a higher speed operating condition than that of the first cam are pivotally supported on a rocker arm shaft. A first connection switching device capable of switching the connection and disconnection between the third and first rocker arms and a second switching device capable of switching the connection and disconnection between at least one of the first and third rocker arms and the second rocker arm independently from the first connection switching device, are disposed at locations displaced circumferentially relative to the rocker arm shaft. Thus, it is possible to dispose a trigger mechanism and to dispose3 roller followers coaxially with the connection switching device, while avoiding the increase in width of the three rocker arms along their swinging axes.

Valve operating device for an internal combustion engine

A valve operating mechanism for an internal combustion engine for varying the operation of the valve dependent on engine operating conditions. A first rocker arm movable to follow a first cam and a second rocker arm movable to follow a second cam corresponding to a higher speed operating condition than that of the first cam are pivotally supported on a rocker arm shaft. A first connection switching device capable of switching the connection and disconnection between the third and first rocker arms and a second switching device capable of switching the connection and disconnection between at least one of the first and third rocker arms and the second rocker arm independently from the first connection switching device, are disposed at locations displaced circumferentially relative to the rocker arm shaft. Thus, it is possible to dispose a trigger mechanism and to dispose roller followers coaxially with the connection switching device, while avoiding the increase in width of the three rocker arms along their swinging axes.

Growing community of inventors

Saitama, Japan

Hideki Saito