Zama Japan Kabushiki Kaisha

Zama Japan

Yamabiko Corporation

Z Ama Japan Co., Ltd.

Iida Denki Kogyo Co., Ltd.

Takumi Nonaka

Hideki Watanabe

David R Shebuski

Toshiyuki Kuyo

Jay A Perry

Akira Yamazaki

Genichi Sato

Ryouhei Yamashita

Tamotsu Saitou

Hiroyuki Oka

Takahiro Yamazaki

Toru Kono

Shirou Yamaguchi

Hisato Onodera

Tamotsu Saito

Tomoyoshi Kudo

Ikumin Ryuzaki

Yuta Iihara

Kazuyuki Tateyanagi

A needle valve body () has a needle hollow part () and a slit () extending in an axial direction and opened forward in a tip region. The carburetor body (B) has a body hole () receiving the needle valve body () in a longitudinally displaceable manner along an axis and a step-part circumferential edge () formed in the body hole () and forming an orifice () with the slit () of the needle valve body (). By operating the needle valve body () to adjust the size of the orifice (), an amount of fuel supplied to a fuel discharge part (Fout) can be adjusted.

Carburetor including a manual fuel control device

A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator and having a main fuel jet and nozzle assembly with a main fuel jet releasably coupled to the body of the carburetor. Alternatively, a main fuel jet and nozzle assembly includes a nozzle and check valve retainer formed as a single component. In other embodiments, a carburetor is provided having a fuel pump and fuel pressure regulator positioned on the same side of the body. A fuel pump and metering chamber diaphragm sandwiched between the body of the carburetor and a pump body and cover, separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator.

Main fuel jet and nozzle assembly for a carburetor

A fuel injection device comprising electricity-generating means generating electricity by rotation of an engine and outputting a predetermined signal, and a solenoid valve injecting fuel; the valve being opened as a result of a drive current applied to a coil, and the fuel being injected into an intake passage of the engine at a predetermined timing during the rotation of the engine; to ensure that the flow rate required during high-speed operation ca be adequately provided in a fuel injection device for injecting/supplying fuel to an engine. The electricity-generating means is an alternating current generation means attached to the engine in a crank angle position at which an output is generated in synchronization with the intake timing of the engine; the signal is an injection command signal applied to the solenoid valve as an alternating-current drive current; and the applied voltage increases with increased engine speed.

Fuel injection device

To improve responsiveness of fuel supply control, a rotary carburetorhas a nozzleincluding a fuel discharge portand a needledisposed coaxially with the nozzleand disposed with a portion inserted into the nozzle. The needlecan be displaced relative to the nozzleto change an effective area of the fuel discharge port. The rotary carburetorhas an electric motorfor displacing the needlealong an axis, and a drive mechanism componentinterposed between the electric motorand the needleand converting a rotational movement of the electric motor into a linear movement.

Portable engine working machine and rotary carburetor incorporated therein

A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator. The fuel pump and fuel pressure regulator are positioned on the same side of the body. A fuel pump and metering chamber diaphragm is sandwiched between the body of the carburetor and a pump body and cover. The diaphragm separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator. Inlet and outlet flapper valves are part of the diaphragm or a separate flapper valve member positioned between the body and the diaphragm.

Carburetor with single diaphragm for supplying and metering fuel

To optimize fuel supply of an engine with a carburetor during engine operation, a throttle opening degree detection sensor detecting a throttle opening degree and a control unit controlling a valve body variably controlling an opening degree of a fuel discharge part or a fuel supply passage based on a map are included. The map includes a plurality of sections divided based on the throttle opening degree and an opening degree of the valve body set for each section. The opening degree of the valve body set for each section is the opening degree of the valve body at which the engine rotation speed is highest in each section. The control unit controls an electric actuator driving the valve body to achieve the opening degree of the valve body set in a section to which the throttle opening degree detected by the throttle opening degree detection sensor belongs out of the plurality of sections.

Portable working machine including engine with carburetor and fuel supply control method thereof

A fuel injection device for smooth discharge of a gas accumulated therein comprising a fuel pump, a solenoid valve for injecting pressurized fuel into the intake passage of an engine, a high-pressure fuel passage extending from the fuel pump to the solenoid valve and has a medially positioned constant-pressure chamber, and a fuel return passage connected to a fuel return pipe, with the fuel return passage extending from the constant-pressure chamber and having a medially positioned priming pump. The constant-pressure chamber is configured with the top wall in the upper space thereof disposed above the opening of the high-pressure fuel passage opposite the solenoid valve, the fuel return passage opens into the upper space at a position above the opening of the high-pressure fuel passage, and the gas accumulating in the constant-pressure chamber is discharged from the upper space toward the fuel tank via the fuel return passage.

An attachment structure for a solenoid valve which can be stably attached to and removed from a carburetor unit with a single movement and without increasing the number of parts. A rod-like supporting portion is disposed a predetermined distance away from a surface of a carburetor unit and extending in a direction substantially perpendicular to a direction of and installed near an opening in the surface of the carburetor unit. A cylindrical engaging portion extends from a circumferential face of a cylindrical body fitted on the solenoid valve substantially perpendicular to an axial line of the rod-like supporting portion, and forms a groove-like engagement portion which is narrower in diameter than the rod-like supporting portion, whereby the engaging portion, via the groove-like engagement portion, is coupled to and supported by rod-like supporting portion when an insertion portion of the solenoid valve is inserted into the opening.

Growing community of inventors

Iwate, Japan

Takumi Nonaka