Portable engine working machine and rotary carburetor incorporated therein
AssigneeYamabiko Corporation
InventorsTakumi Nonaka, Genichi Sato
Life of this patent
Estimating the term…
Abstract
To improve responsiveness of fuel supply control, a rotary carburetor 100 has a nozzle 8 including a fuel discharge port 8a and a needle 10 disposed coaxially with the nozzle 8 and disposed with a portion inserted into the nozzle 8. The needle 10 can be displaced relative to the nozzle 8 to change an effective area of the fuel discharge port 8a. The rotary carburetor 100 has an electric motor 14 for displacing the needle 10 along an axis, and a drive mechanism component 12 interposed between the electric motor 14 and the needle 10 and converting a rotational movement of the electric motor into a linear movement.
Claims13
A portable engine working machine comprising:
- a rotary carburetor disposed in an intake passage of the portable engine working machine;
- a rotatable valve main body included in the rotary carburetor, mechanically coupled to a throttle trigger operated by an operator, and rotated by an operation of the throttle trigger to change a throttle opening degree;
- a nozzle disposed on an axis of the rotatable valve main body and including a fuel discharge port supplying a fuel to an intra-carburetor air-fuel mixture passage;
- a needle disposed coaxially with the nozzle and disposed with a portion inserted into the nozzle, the needle being displaced relative to the nozzle to change an effective area of the fuel discharge port so as to control an amount of a fuel discharged from the fuel discharge port;
- an electric motor for displacing the needle along an axis;
- a drive mechanism component interposed between the electric motor and the needle and converting a rotational movement of the electric motor into a linear movement;
- and
- a control unit for zero-point adjustment adjusting an origin of the electric motor, wherein
- the control unit sets as the origin a position at which the needle is no longer displaceable upward or downward when the electric motor is driven out of a control range of displacement of the needle for controlling an amount of the fuel.
A rotary carburetor disposed in an intake passage of a portable engine working machine comprising:
- a rotatable valve main body mechanically coupled to a throttle trigger operated by an operator, the rotatable valve main body rotated by an operation of the throttle trigger to change a throttle opening degree;
- a nozzle disposed on an axis of the rotatable valve main body and including a fuel discharge port supplying a fuel to an intra-carburetor air-fuel mixture passage;
- a needle disposed coaxially with the nozzle and disposed with a portion inserted into the nozzle, the needle being displaced relative to the nozzle to change an effective area of the fuel discharge port so as to control an amount of a fuel discharged from the fuel discharge port;
- an electric motor for displacing the needle along an axis;
- a drive mechanism component interposed between the electric motor and the needle and converting a rotational movement of the electric motor into a linear movement;
- and
- a control unit for zero-point adjustment adjusting the origin of the electric motor, wherein
- the control unit sets as the origin a position at which the needle is no longer displaceable upward or downward when the electric motor is driven out of a control range of displacement of the needle for controlling an amount of the fuel.
Dependencies are inferred from the claim text.