Back to results
US 6,274,074 B1Granted
Process for producing a rotating gear made of thermoplastics material, and gear thus obtained
AssigneeSociété Mécanique et de Plastiques Industriels
InventorJean Monié
Life of this patent
Estimating the term…
Abstract
This invention discloses a process for producing a low-noise gear. It consists in producing this gear by the technique of co-injection of a hard matter which will form the outer toothing and the axial portion for engagement on the shaft associated therewith, and of a damping matter which will form the heart of the thermoplastics gear.
Claims6
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, comprising
- producing 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.
Dependencies are inferred from the claim text.