Patent ID: 7352101

Claim:
A skew shape variable laminated iron core in which plural iron core pieces are laminated through caulking projections and caulking holes in which the caulking projections are fitted, characterized in that in the iron core pieces except a lowermost layer, the caulking projections and the caulking holes are respectively formed at different positions of a same radius from a rotation center at skewing of the iron core pieces, and the caulking hole has an arc shape as viewed from the rotation center and is longer in a circumferential direction than the caulking projection fitted in the caulking hole, and when the caulking projection of the iron core piece of an upper layer is fitted in the caulking hole of the iron core piece of a lower layer under the upper layer, a gap is formed in the circumferential direction of each of the caulking holes, wherein with the upper and lower layers laminated together and the caulking projection of the iron core piece of the upper layer fitted in the caulking hole of the iron core piece of the lower layer, the caulking projection of the iron core piece of the upper layer is movable circumferentially within the caulking hole of the iron core piece of the lower layer to thereby allow the laminated iron core pieces of the upper and lower layers to move relative to each other around the rotation center a predetermined amount, as determined by relative circumferential dimensions of the caulking projection of the core piece in the upper layer and caulking hole of the iron core piece of the lower layer.