Patent ID: 9068647
Filing Date: 2015-06-30
Classification: B23P,B29C,B29D,B29L,F16H,Y10T

Abstract:
1. A method of manufacturing a gear wheel for an automobile steering wheel, the method comprising: preparing an insertion unit formed of a steel material having a hollow pipe shape, wherein the insertion unit comprises a pair of coupling grooves sunken inward in a circumferential direction along two ends of an outer circumference of the insertion unit, and a plurality of coupling protrusions protruding from the outer circumference of the insertion unit and connecting the pair of coupling grooves in a vertical direction, the plurality of coupling protrusions having an arc shape sunken inward along the vertical direction, wherein a connection between the pair of coupling groves and the plurality of coupling protrusions does not form an angled corner; injection-molding an outer side unit having teeth on an outer circumference of the outer side unit; and molding a connection unit having a wheel shape by injecting resin into at least three different points between the insertion unit and the outer side unit so as to connect the insertion unit and the outer side unit and arrange the insertion unit at an inner center of the outer side unit, wherein said at least three different points are apart from each other at same interval of distance.