| 主权项 |
1. A portable working machine provided with an engine as a power source, the working machine comprising:
a centrifugal fan which is driven by the engine and which sucks and transfers air; a main passage which is provided in a housing space where the centrifugal fan is housed, and through which a cooling airflow containing dust particles that have been pressed, by the centrifugal fan, against an inner peripheral surface of a wall defining the housing space is transferred; a branch air inlet which is provided at a position displaced from the main passage, and through which air containing less dust particles than the airflow passing through the main passage is transferred toward an air filter; a cyclone separator which is provided upstream of the air filter and has a circular cross section; and an introduction passage which extends from the branch air inlet to the cyclone separator, wherein:
a margin space where at least part of the air introduced in the introduction passage flows is formed in the introduction passage before the cyclone separator, andthe working machine is configured such that a swirl flow occurring in the cyclone separator starts at the margin space. |
