| 摘要 |
A method of assembling a hand held electrically powered drilling and/or hammering tool having a tool housing and a drilling and/or hammering spindle mounted within the housing, which spindle has a forward end at which a tool or bit may be mounted; comprising the steps of making a motor sub-assembly including a motor (4) and a radial fan (2), the fan having a plurality of blades (16) located on one side of the fan and non-rotatably mounting the fan on an end of the armature shaft of the motor at a first end of the motor with the blades (16) facing away from the armature of the motor. Then balancing the motor sub-assembly. Then mounting the sub-assembly within the housing, with the longitudinal axis of the motor armature shaft at an angle, preferably perpendicular to the longitudinal axis (3) of the spindle and with the first end of the motor closest to the spindle axis (3). Thus, in use of the tool, the fan rotates at the first end of the motor to draw air into its inlet via air inlets (8a, 8b) in the housing and so as to push air through the motor and out of air outlets (10) in the housing in the region of the second end of the motor which is remote from the spindle axis (3). A drilling and/or hammering tool made according to the method is also described.
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