Portable working machine
AssigneeYamabiko Corporation
InventorsHiroshi Nakaganna, Buhei Kobayashi
Life of this patent
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Abstract
A cyclone separator having a circular cross section is arranged upstream of an air filter. An introduction passage extends from a branch air inlet, which is provided at a position displaced from a main passage, to the cyclone separator. A margin space where at least part of air introduced in the introduction passage flows is formed in the introduction passage before the cyclone separator. A swirl flow occurring in the cyclone separator starts at this margin space.
Claims12
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, and
- the working machine is configured such that a swirl flow occurring in the cyclone separator starts at the margin space.
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 an outlet-side cylindrical portion which has a smaller inside diameter than the cyclone separator is provided before an outlet of the cyclone separator.
Dependencies are inferred from the claim text.