JP2004266968A5 - - Google Patents

Claims (6)

A rotor having an output shaft and a stator having a bearing portion for the output shaft on the inner diameter side, and the rotor and the stator are opposed to each other with a predetermined gap along the axial direction on the output shaft In the axial gap type motor that has been
The bearing portion includes first and second radial ball bearings in which each inner ring is press-fitted and fixed to the output shaft, and a substantially cylindrical bearing housing that is integrally fixed to the inner diameter side of the stator. And
The bearing housing has a first bearing housing portion in which the outer ring of the first radial ball bearing is housed from one end side thereof, and a second bearing housing portion in which the outer ring of the second radial ball bearing is housed from the other end side. And a partition wall is formed between the first and second bearing storage parts,
The first bearing storage portion is formed in a size that allows the outer ring of the first radial ball bearing to be press-fitted to an extent that the inner diameter does not distort the ball raceway in the bearing.
The inner diameter of the second bearing storage portion is formed such that an inner diameter of the second radial ball bearing can be loosely fitted, and between the partition wall and the outer ring of the second radial ball bearing. Is an axial gap type motor characterized in that a preload spring is interposed. The axial gap type according to claim 1, wherein a sleeve for forcibly reducing the diameter of the second bearing storage portion and fixing the outer ring of the second radial ball bearing is provided on an outer periphery of the second bearing storage portion. Electric motor. The axial gap type electric motor according to claim 1 or 2, wherein an inner diameter of the partition wall is larger than an outer diameter of an inner ring of each of the radial ball bearings. 4. The axial gap type electric motor according to claim 1, wherein the preload spring is a wave washer spring that urges the outer ring of the radial ball bearing in a direction parallel to the axis of the output shaft. 5. The axial gap type electric motor according to claim 1, wherein the first and second bearing housing portions are provided with a plurality of slits for imparting flexibility to the respective bearing housing portions. . The axial gap type electric motor according to claim 5, wherein the slot groove provided in the first bearing housing portion and the slot groove provided in the second bearing housing portion are provided at different positions.