Abstract: Forming a caulking portion involves forming: a planar portion that is connected to a main body of an iron core piece, that is formed into a concave shape with respect to a face of the iron core piece which is on one side in the thickness direction, that formed into a convex shape with respect to a face of the iron core piece which is on another side in the thickness direction, and that is parallel to the faces; and a pair of extended portions that include a pair of sloped portions which extend out obliquely from both ends, along the lengthwise direction of the caulking portion, of the planar portion, toward mutually opposite sides in the lengthwise direction and toward another side in the thickness direction. Forming the pair of sloped portions involves extending the pair of sloped portions in the oblique directions.

Abstract: In a method for manufacturing a stacked iron core, a stacked iron core body is manufactured by stacking so as to be phase-offset with respect to each other in the circumferential direction plural ring-shaped iron core pieces respectively configured by plural circular arc-shaped iron core pieces arranged into ring shapes. Next, each layer of the circular arc-shaped iron core pieces, which are phase-offset with respect to each other in the circumferential direction, is welded together along a stacking direction at plural locations (plural weld portions) arranged around the circumferential direction of an inner circumferential portion or an outer circumferential portion of the stacked iron core body. A pair of key protrusions is formed on inner circumferential portions of the stacked iron core at positions opposing each other, and so key components are rendered unnecessary when assembling a rotor of a vehicle drive motor.

Abstract: In a method for manufacturing a stacked iron core, a stacked iron core body is manufactured by stacking so as to be phase-offset with respect to each other in the circumferential direction plural ring-shaped iron core pieces respectively configured by plural circular arc-shaped iron core pieces arranged into ring shapes. Next, each layer of the circular arc-shaped iron core pieces, which are phase-offset with respect to each other in the circumferential direction, is welded together along a stacking direction at plural locations (plural weld portions) arranged around the circumferential direction of an inner circumferential portion or an outer circumferential portion of the stacked iron core body. A pair of key protrusions is formed on inner circumferential portions of the stacked iron core at positions opposing each other, and so key components are rendered unnecessary when assembling a rotor of a vehicle drive motor.

Abstract: A tolerance ring that has a ring shape approximately circling along a predetermined direction includes a plurality of projections, wherein the curvature radiuses of end portions in a circling direction are smaller than the curvature radius of a portion other than the end portions in the circling direction.

Abstract: A tolerance ring that has a ring shape approximately circling along a predetermined direction includes a plurality of projections, wherein the curvature radiuses of end portions in a circling direction are smaller than the curvature radius of a portion other than the end portions in the circling direction.