Patent ID: 8794096

Claim:
A gear wheel, comprising: a gear rim; an insert whose external diameter is greater than a half of an external diameter of the gear wheel, the insert having first and second opposing sides, the insert coated by extrusion by means of a diaphragm gate, with the first opposing side facing the diaphragm gate; a single circumferential groove on a lateral portion of the first opposing side, the groove having first and second side walls and facing the gear rim so as to fill with injection molding material during an injection molding process forming the gear rim, the groove running in a rotational direction in order to form a stabilizing or retaining gear tooth structure in the axial direction of an axis of the insert to stabilize the gear rim; and a plurality of indentations on a lateral portion of the second opposing side, the plurality of indentations formed in a circumferential direction parallel to an axis of the insert so as to fill with the injection molding material during said injection molding process forming the gear rim, to cause a form-fitting connection to the gear rim, thereby enhancing transfer of force in the rotational direction, wherein the plurality of indentations faces the gear rim and at least a portion of the gear rim material penetrates into the plurality of indentations.