Patent ID: 7323797

Claim:
A power tool comprising: a tool bit, a housing, and an electric motor housed in the housing to drive the tool bit, the electric motor comprising: an output shaft connected to the tool bit, a commutator and an armature that are fitted onto the output shaft and rotate together with the output shaft, brushes that supply current in sliding contact with an outer periphery of the commutator, brush holders that house the respective brushes, a brush holder base to which the brush holders are respectively secured, a cooling fan disposed between the brush holder base and the armature in the axial direction of the output shaft, the cooling fan rotating together with the output shaft, the cooling fan taking in a cooling air and discharging the cooling air in a centrifugal direction that crosses the axial direction of the output shaft, and a cooling-fan facing surface formed on the brush holder base, wherein the cooling-fan facing surface faces the cooling fan, is substantially flat, and extends from an inner edge of the brush holder base in the centrifugal direction of the cooling fan to guide the discharged cooling air from the cooling fan in the centrifugal direction of the cooling fan.