| 摘要 |
A combustion nailer (10) having a combustion power source (14) defining a fan motor chamber (50) having at least one chamber wall (52, 54) and a motor shaft hole (56) . A fan motor (44) is disposed in the fan motor chamber (50) and has a motor shaft (42) projecting through the motor shaft hole (56). A one way valve (60) is associated with the chamber (18) and the motor and is configured for allowing unidirectional airflow through the hole (56) past the motor (44), and preventing airflow in the opposite direction.
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