Electric power tool dust collection system

An electric power tool dust collection system comprising:

• a hammer drill (1) that includes a hammer drill motor and a hammer drill fan, (2) configured to receive and retain a bit and (3) that includes an output portion with a striking mechanism;
• a dust collection device mounted to the hammer drill and including a suction portion, a dust collection motor, a dust collection fan rotated by drive of the dust collection motor to generate a sucking force in the suction portion, and a dust collection portion that stores powder dust suctioned from the suction portion;
• and
• a first exhaust flow path in the hammer drill and a second exhaust flow path in the dust collection device configured to lead exhaust air that has passed through the dust collection portion to the output portion in an interior of the hammer drill to cool the output portion;
• wherein:
• the dust collection motor is a separate motor from the hammer drill motor and the dust collection fan is a separate fan from the hammer drill fan;
• the output portion is tubular and extends along a longitudinal axis of the bit when the bit is retained by the hammer drill;
• and
• the output portion and the first exhaust flow path are configured such that the exhaust air directly contacts the output portion in the first exhaust flow path.