Patent ID: 9673678
Date: 2017-06-06
CPC Classifications: H02K

Claim:
1. A motor comprising: a shaft extending in an axial direction, the axial direction comprising a first direction and a second direction opposite to the first direction; a rotor; a stator, first direction bearing; a second direction bearing; a motor casing that is made of a resin; a casing cover; a second direction damping member, an upper damping member that is formed of an annular elastic material, a lower bearing bracket that is made of metal; an upper bearing bracket that is made of metal, and a bearing conducting member, wherein the rotor is fixed to the shaft, the stator is disposed outside the rotor in a radial direction, the first direction bearing is disposed in the first direction relative to the rotor and is structured to support the shaft so as to allow the shaft to be rotatable, the second direction bearing is disposed in the second direction relative to the rotor and is structured to support the shaft so as to allow the shaft to be rotatable, the motor casing comprises an opening formed at a first direction portion thereof in the axial direction, the casing cover is structured to hold the first direction bearing and cover the opening, the second direction damping member is formed of an annular elastic material, the motor casing comprises: a convex or concave rotation prevention portion is provided on an inner peripheral surface of the second direction damping member, and the convex rotation prevention portion is received in the second direction boss recess or the concave rotation prevention portion receives the second direction boss protrusion; the casing cover is made of a resin and includes a top wall portion and an upper boss portion, the top wall portion is formed in an annular shape and covers the opening of the motor casing, the upper boss portion is formed in the shape of a cylinder that includes a lid and protrudes upward from an upper surface of the top wall portion in the axial direction, the upper bearing is disposed inside the upper boss portion in the radial direction, the upper damping member is disposed outside the upper boss portion in the radial direction, and the upper boss portion is provided with an upper boss recess or an upper boss protrusion, a convex or concave rotation prevention portion is provided on an inner peripheral surface of the upper damping member, and the convex rotation prevention portion is received in the lower boss recess or the concave rotation prevention portion receives the lower boss protrusion; the lower bearing bracket is received inside the lower boss portion in the radial direction, and is structured to hold the lower bearing, the upper bearing bracket is received inside the upper boss portion in the radial direction, and is structured to hold the upper bearing, the bearing conducting member is disposed outside the motor casing in the radial direction and is structured to electrically connect the upper bearing to the lower bearing, the upper bearing and the lower bearing are made of metal, an inner peripheral surface of the lower bearing bracket contacts an outer peripheral surface of the lower bearing, and a part of an outer peripheral surface of the lower bearing bracket is exposed in the lower boss recess, an inner peripheral surface of the upper bearing bracket contacts an outer peripheral surface of the upper bearing, and a part of an outer peripheral surface of the upper bearing bracket is exposed in the upper boss recess, and the bearing conducting member contacts the outer peripheral surface of the upper bearing bracket that is exposed from the upper boss recess, and the outer peripheral surface of the lower bearing bracket that is exposed from the lower boss recess.