| 摘要 |
A combustion-chamber frame (11) is disposed in a housing (2) of a combustion-type power tool and is movable in a longitudinal direction in interlocking relation to a push lever (10). The combustion-chamber frame is abuttable on a head portion (13) to provide a combustion chamber (26) in cooperation with the head portion and a piston (25). A fan (14) is disposed in the combustion chamber and is connected to an output shaft (3B) of a motor (3) so as to be rotatable with the output shaft for promoting turbulent combustion of air-fuel mixture. The fan and the combustion-chamber frame define, within the combustion chamber, a high turbulent-combustion region in which the turbulent combustion is rapidly generated and a low turbulent-combustion region (H) outside the high turbulent-combustion region (H). A fin (36,37,38) is disposed at at least one of the combustion-chamber frame, the head portion, and the piston to protrude into the combustion chamber. The fin is located within the low turbulent-combustion region.
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