Patent ID: 6274074
Filing Date: 2001-08-14
Classification: B29C,B29K,B29L,F16H,Y10S,Y10T

Abstract:
A process of manufacturing a rotating gear made of thermoplastic material, said gear having an outer toothing and an axial drive portion for transmitting movement, comprisingproducing said gear by co-injection into an injection mold, through a common injection orifice, of two thermoplastics materials having different mechanical characteristics:a first thermoplastics material presenting high performances of hardness which is injected in the common injection orifice, so as to form an envelope of the gear, said envelope comprising an axial drive portion of said gear and at least an outer skin of the toothing,and a second thermoplastic material, which is injected without waiting, by co-injection, inside said first thermoplastics material not yet solidified, said second material having qualities of vibration damping, and being less hard than the first thermoplastics material.