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US 2010/0132679 A1Published application
Power unit for portable chain saw
AssigneeYamabiko Corporation
InventorsKinumune Kawamura, Masato Nara
Life of this patent
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Abstract
A power unit for portable chain saws wherein an ignition coil is placed at a position so as to increase both the compactness and the cooling efficiency of the power unit. A coil support on which the ignition coil is supported is formed integratedly with a crank case; adjacent to an open port; and on a part of an external periphery of the flywheel, said second part being not enclosed by the air-guiding passage. The coil support extends from the crank case along a side of a muffler and forms an insulating gap from the muffler.
Claims8
A power unit for a portable chain saw, comprising:
- a flywheel having blades;
- an air-guiding passage
- enclosing a first part of an external periphery of the flywheel and
- having an open port towards a cylinder of an engine accommodated in the power unit;
- an ignition coil facing the external periphery of the flywheel;
- and
- a coil support
- integrated with a crank case,
- provided adjacent to the open port, and
- provided on a second part of an external periphery of the flywheel,
- said second part being not enclosed by the air-guiding passage;
- wherein the coil support extends outwards of the crank case along a side of a muffler so as to form an insulating gap from the muffler.
9 more elements
Dependencies are inferred from the claim text.