The present invention relates to a carburetor chamber for a power-driven machine, particularly a chain saw, which is provided, at its top, with an engine cylinder and, at its lower part, with an engine crank case and, at the rear part of the cylinder, with a carburetor in a manner that the carburetor is juxtaposed with the cylinder.
Generally, in a machine arranged to operate with the use of an internal combustion engine as a power source, a connecting or communicating of an air-fuel mixture outlet of a carburetor with a suction port of a engine cylinder is effected through a bellows type gas pipe in consideration of the thermal expansion, etc.
In this case, however, the fuel in the air-fuel mixture is very likely to attach to and stay on an inner surface of the bellows, so that the air-fuel ratio is varied due to a dropping of such fuel, so that unexpected variations in revolution occur during an idling speed of the engine. This becomes a cause of the troubles.
Further, in the chain saw, an elongate flexible pipe and the like are used to feed chain-lubricating oil under pressure. For this reason, for example, the problems of pipe breakage and oil leakage are liable to arise as the particular problems of the chain saw. Further the inconveniences such as that of making it difficult to adjust or control the engine output and the engine idling speed due, for example, to a displacement in attachment position of the throttle valve operation lever of the carburetor, have hitherto arisen.