Power tool and method for assembling the same
AssigneeHitachi Koki Co., Ltd.
InventorsShigeru Takahashi, Naoki Tadokoro, Takuma Saito
Life of this patent
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Abstract
A power tool 1 includes a cylindrical-shaped yoke 31, magnets 32 provided in the interior of the yoke 31, an armature 41 disposed rotatably in the interior of the yoke 31, a cooling fan 7 rotatably secured to the armature 41, a fan guide 8 disposed on the periphery of the cooling fan 7, and a cylindrical-shaped housing 2 for storing the yoke 31 therein. The fan guide 8 is contacted with the axial-direction one end face of the yoke 31, and the fan guide 8 is engaged with the yoke 31 in the rotation direction thereof.
Claims11
A power tool, comprising:
- a cylindrical-shaped yoke;
- magnets provided in an interior of the yoke;
- an armature disposed rotatably in the interior of the yoke;
- a cooling fan rotatably secured to the armature;
- a fan guide disposed on a periphery of the cooling fan;
- and
- a cylindrical-shaped housing having the yoke mounted therein;
- and
- wherein the fan guide contacts an axial-direction one end face of the yoke and is engaged with the yoke in a rotation direction thereof.
A method for assembling a power tool comprising a cylindrical-shaped yoke, magnets provided in an interior of the yoke, an armature disposed rotatably in the interior of the yoke, a cooling fan rotatably secured to the armature, a fan guide disposed on a periphery of the cooling fan, and a cylindrical-shaped housing having the yoke mounted therein said method comprising the steps of:
- covering one end portion of an armature set comprised of the armature and the cooling fan mounted on the rotation shaft thereof, with a protection cap made of nonmagnetic material;
- inserting the armature set, with the protection cap side at the head thereof, into an inside of the yoke set including the yoke and the magnets, to thereby assemble a motor assembly;
- and thereafter remove the protection cap from the motor assembly and
- pushing the motor assembly into the cylindrical-shaped housing to thereby assemble the motor assembly into the cylindrical-shaped housing.
Dependencies are inferred from the claim text.