| 摘要 |
There is provided a structure for use in a power driven tool (1) for collecting dust generated by the operation of the tool. The structure includes: an outer housing; a commutation motor (5) disposed within the housing and including a main shaft (6) which has a tip end and a commutator (7) on the main shaft; a pair of brush assemblies (29) radially disposed around, and in contact with, the commutator of the motor; and a dust collecting fan (9) mounted on the main shaft of the commutation motor. The fan is disposed between the commutator and the outer housing. Also included are a dust intake passage (28) formed within the housing and having an intake (27) formed adjacent the location where dust is generated by the operation of the tool; a dust discharge passage (46) formed within the housing and having an outlet; and a dust chamber (43) formed substantially between the outer housing and the commutator for containing the dust collecting fan. The dust chamber has a first connecting portion (35) coupled to the dust intake passage and a second connecting portion (40) coupled to the dust discharge passage. The first and second connecting portions are arranged around the main shaft where they do not overlap the brush assemblies in the axial direction of the main shaft.
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