| 摘要 |
The present invention provides an electric handheld power tool, which comprises a tool housing, a motor mounted within the tool housing, a fan, and an output mechanism driven by the motor; a cover of the motor has an air inlet and an air outlet, and the motor housing has at least two slots which are angularly offset with respect to the air outlet, and at least one rib extending outwardly from the motor cover. Since the slots of the housing are offset with respect to the air outlet of the motor cover in an angular direction, electric sparks that may be generated in the motor are substantially isolated and constrained by the housing and not allowed to flow to outside of the housing. Therefore, potential danger is avoided and operational safety is enhanced. At the same time, the cavity between the motor cover and the tool housing is divided by the rib such that circulation of the air in the space is prevented. The air driven from inside of the motor cover is totally exhausted from the slots of the tool housing and thus the efficiency of the heating dissipation of the motor is enhanced.
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