Patent ID: 7427056

Claim:
A mixer for an engine for mixing a fuel and air supplied to the engine, comprising: a base portion having an intake passage in which the air flows, a fuel passage in which the fuel flows, a mixing space in which the fuel flowing from the fuel passage and the air flowing from the intake passage are mixed, and an axial hole which has a cylindrical shape and communicates with the mixing space; a first valve having an axial portion fitted in the axial hole of the base portion and rotatable in a circumferential direction of the axial portion, a center hole which is provided in the axial portion and communicates with the axial hole, and a first opening which is provided at the axial portion and communicates with the center hole, the first opening communicable with the fuel passage; and a first drive portion for rotating the first valve in a circumferential direction thereof relative to the axial hole for changing a communicating area of the first opening of the first valve with the fuel passage as the first valve is rotated in the circumferential direction thereof.