Skew shape variable laminated iron core and method of manufacturing the same
AssigneeMitsui High-Tec, Inc.
InventorKatsufusa Fujita
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Abstract
In a laminated iron core in which plural iron core pieces are laminated through caulking projections and caulking holes in which the caulking projections are fitted, and in the iron core pieces except a lowermost layer, the caulking projections and the caulking holes are formed at different positions of a same radius from a rotation center at skewing of the iron core pieces, and the caulking hole 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, a gap is formed in the circumferential direction of each of the caulking holes.
Claims11
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.
A manufacturing method of a skew shape variable laminated iron core, comprising:
- forming a caulking hole in a lowermost layer iron core piece, and forming caulking projections and caulking holes respectively in iron core pieces except the lowermost layer at a same radius position from a rotation center at skewing and at different positions, and
- forming a laminated iron core by fitting the caulking projection of the iron core piece of an upper layer into the caulking hole of the iron core piece of a lower layer,
- characterized in that the caulking hole of the iron core piece in the lower layer has an arc shape as viewed from the rotating center and is formed to be longer than the caulking projection in a circumferential direction with respect to the rotation axis as a center, and when the caulking projection of the iron core piece of the upper layer is fitted into the caulking hole of the iron core piece of the lower layer, a gap is formed between the caulking hole in the iron core piece in the lower layer and the caulking projection of the iron core piece in the upper layer and in the circumferential direction, and
- after laminating the iron core piece in the upper and lower layers, relatively moving the laminated iron core pieces in the upper and lower layers relative to the rotation center and thereby causing the caulking projection of the iron core piece of the upper layer to move circumferentially within the caulking hole of the iron core piece of the lower layer a predetermined amount as determined by relative circumferential dimensions of the caulking projection of the core piece in the upper layer and the caulking hole of the iron core piece of the lower layer.
Dependencies are inferred from the claim text.