Patent ID: 6160248
Filing Date: 2000-12-12
Classification: C21D,Y02P

Abstract:
A device for simultaneous peripheral electroinductive hardening of bearing surfaces and transition radii on crankshafts said crankshafts each rotatable about an axis of rotation, said device comprising lifting pins arranged directly adjacent to each other and one behind the other with different angular positions in the plane perpendicular to the axis of rotation of said crankshafts, inductors being provided, which are placed onto the lifting pins from at least approximately the same direction and whichsaid inductors respectively assigned to a lifting pin and arranged overlapping each other in the axial direction of the crankshaft, each inductor having at least two inductor segments arranged parallel to each other, with one inductor segment of each inductor arranged in an overlapping region of the lifting pins, and the other inductor segment is arranged in an outer region of the lifting pin facing a web of the crankshaft;each inductor including a long inductor portion and a short inductor portion, the long inductor portions partly having a width which is greater than half the total width of the bearing surfaces, and;the long inductor portions being arranged to cover an upper quadrant of the lifting pin periphery through at least 60.degree.;the long inductor portions having a width which is greater than half the total width of the bearing surfaces;the long inductor portions have a spacing with respect to one another, in the peripheral direction of the crankshaft, and;the long inductor portions respectively covering a lower quadrant of the lifting pin periphery adjoining the upper quadrants of the lifting pin periphery through at least 30.degree..