Patent ID: 7228947
Filing Date: 2007-06-12
Classification: B22D,F16D,Y10T

Abstract:
1. A core-box comprising at least two half core-boxes of partially complementary shape, the half core-boxes facing one another and being in contact with one another, defining an internal cavity of the core-box, the cavity comprising a central shell-shaped portion, a connecting portion, and a substantially annular, disk-shaped, intermediate portion which opens to the exterior in a substantially circular duct, the central portion being connected to the intermediate portion by means of the connecting portion, characterized in that the cavity has the shape of a casting core of a braking band, the band having at least two plates connected to one another by connecting elements, in which the space between the plates forms an internal air-duct, defined by surfaces, for the cooling of the braking band, characterized in that the core is suitable for forming, in at least one of the surfaces defining the air-ducts, at least one groove which extends substantially around a circle concentric with a rotational axis of the disk and has a cross-section which becomes wider, towards the air-duct for a predominant depth of the groove, said core comprising: an annular band having the shape of the air-duct, at least one protuberance disposed on the annular band and tapered outwardly for a predominant portion of its height, said protuberance defining the shape of said groove, a plurality of openings interrupting said annular band, said openings defining the shape of said connecting elements, wherein a portion of the protuberance is disposed over the openings and defines the cross-section of the groove in an intersection region between the groove and a connection element, such that the groove extends beneath the connecting elements between the two plates of the braking band.