Suzuki Jidosha Kogyo Kabushiki Kaisha

Suzuki Motor Company

Mikuni Kogyo Kabushiki Kaisha

Suzuki Kogyo Kabushiki Kaisha

Hiroshi Yokoyama

Tokuzi Ishida

Kenichi Aoyagi

Yuzuru Namba

Kunio Kikuchi

Kazuaki Zama

An internal combustion engine which devises the opened direction and position of the gas outlet end of a sub-suction path provided separately from a main suction path so as to inject a gas in the circumferential direction of a combustion chamber during the suction stroke, in which the outlet end of the sub-suction path opens within such a range that, in a plane normal to the axis of the cylinder, the line extending in an opened direction of the sub-suction path is at an angle of .+-.20 to 110 degrees with respect to the line joining the center of the suction port and the axis of the cylinder; the distance between the outlet end of the sub-suction path and the face of a suction valve at its closed position is not more than the internal diameter of the main suction path; or the outlet end of the sub-suction path is positioned within a sphere with its center being a spark point of an ignition plug and with the same diameter as the internal diameter of the cylinder and within a range of .+-.1 mm from the plane which contains both the center line of the stem of the intake valve and such one of the points of tangency between the valve facing circle of the valve seat of the suction valve and the lines drawm from the spark point of the ignition plug as is nearer to the wall of the cylinder.

Internal combustion engine

An air-fuel mixture intake apparatus for internal combustion engines includes a two-barrel carburetor having a primary venturi for supplying an air-fuel mixture into a combustion chamber under all loads and a secondary venturi for supplying an air-fuel mixture into the combustion chamber under medium and high loads. The primary venturi is of a fixed cross section and the secondary venturi is of a variable cross section. A vacuum-operated actuator controls operation of a secondary throttle valve in response to a vacuum developed in the primary venturi and subsequently in the secondary venturi. The secondary throttle valve is interlinked with a primary throttle valve by a linkage mechanism such that the secondary throttle valve is allowed to open when the primary throttle valve opens to a predetermined degree with the maximum opening of the secondary throttle valve being variably controlled by the opening of the primary throttle valve after the latter has opened beyond the predetermined degree. A delay valve is disposed in a primary vacuum signal passageway or a common vacuum signal passageway connected to a vacuum chamber of the vacuum-operated actuator to delay an air flow through the passageway toward a vacuum pickup probe in the primary venturi. The secondary throttle valve may be mounted on a shaft displaced downstream off the geometric center of the secondary throttle valve.

Air-fuel mixture intake apparatus for internal combustion engines

An internal combustion engine equipped with a sub-suction path to produce a swirl of suction in the combustion chamber, characterized in that there are two inlets to the sub-suction path, one of the inlets opening into the atmosphere side after bypassing the throttle valve of the carburetor to the venturi and the other being operable by the throttle valve of the carburetor and opening in the duct of the carburetor so that it can be closed by the throttle valve at idling. In this arrangement of the engine, the fuel consumption can be saved; a misfiring can be prevented; an untimely or delayed injection of fuel from the main fuel nozzle in low to high load operation can be averted; and a stable combustion can be assured in medium load operation in which a particularly heavy EGR takes place.

4-Cycle internal combustion engine

A suction system for an internal combustion engine which is equipped with a sub-suction path provided separately from a main suction path for generating a swirl of the gases in a combustion chamber during the suction stroke. The amount of the air to be supplied via the sub-suction path to the combustion chamber is less than 40% preferably from 10 to 40%, more preferably from 20 to 30% of the total amount of the air to be supplied to the combustion chamber. Alternatively the effective area of the sub-suction path at its outlet end is 0.2 to 3.0% of that of the main suction path.

A duplex carburetor for an internal combustion engine has a primary barrel having a primary venturi for supplying an air-fuel mixture to an intake manifold under a full range of engine loads and a secondary barrel having a secondary venturi for supplying an air-fuel mixture to the manifold under higher engine loads. The primary venturi has a cross section which ranges from 20% to 30% of that of the secondary venturi. The secondary barrel has a flattened cross-sectional shape such as of a segment of a circle of an ellipse, and is located adjacent to the primary barrel. The intake manifold is of a duplex construction having primary and secondary common passages connected to the primary and secondary barrels, respectively, of the carburetor. The secondary passage of the manifold has a flattened cross-sectional shape such as of a segment of a circle or an ellipse, and is positioned adjacent to the primary passage. The primary passage extends through a region where the secondary passage is divided into a plurality of secondary branches, and is located immediately in front of the shortest one of the secondary branch. The primary passage is also branched into a plurality of primary branches, the shortest of which is displaced out of axial alignment with a central axis of the intake manifold.

Duplex carburetor and intake system for internal combustion engines

An internal combustion engine which devises the opened direction and position of the gas outlet end of a sub-suction path provided separately from a main suction path so as to inject a gas in the circumferential direction of a combustion chamber during the suction stroke, in which the outlet end of the sub-suction path opens within such a range that, in a plane normal to the axis of the cylinder, the line extending in an opened direction of the sub-suction path is at an angle of .+-.20 to 110 degrees with respect to the line joining the center of the suction port and the axis of the cylinder; the distance between the outlet end of the sub-suction path and the face of a suction valve at its closed position is not more than the internal diameter of the main suction path; or the outlet end of the sub-suction path is positioned within a sphere with its center being a spark point of an ignition plug and with the same diameter as the internal diameter of the cylinder and within a range of .+-.1 mm from the plane which contains both the center line of the stem of the intake valve and such one of the points of tangency between the valve facing circle of the valve seat of the suction valve and the lines drawn from the spark joint of the ignition plug as is nearer to the wall of the cylinder.

A compound carburetor wherein, in order that, in the course of the transit from the primary side to the secondary side, an air-fuel mixture fed to each cylinder may maintain a uniform air-fuel ratio without causing an air lock and the transit may be made smoothly and definitely, an independent secondary slow-running fuel system is provided for each cylinder and a secondary slow mixture path includes in the course a pipe connected between a carburetor part and manifold part.

Compound carburetor

The present invention relates to a four-cycle internal combustion engine in which a strong swirl can be generated within the combustion chamber through the directionality of the mixed gas supplied from the main suction path and the injection of a gas from the sub-suction path, and a heavier EGR than before can be carried out without detracting the engine performance, and NOx generation can be substantially reduced by EGR alone. In time of idling when a heavy EGR is needless, the gas injection from the sub-suction path is controlled to prevent a misfiring.

Growing community of inventors

Hamamatsu, Japan

Hiroshi Yokoyama