Composite rotary drive member and method of its formation

Details Composite rotary drive member and method of its formation Composite rotary drive member and method of its formation

F - Mech Eng,Light,Heat,Weapons

16

H

26/174, 74/215

F16H 55/14 (2006.01)

Patent

CA 1298490

2-490CA COMPOSITE ROTARY DRIVE MEMBER AND METHOD OF ITS FORMATION Abstract A composite rotary drive member such as a gear, pulley or the like is formed from thermoplastics material that is molded in situ about one or more metal inserts. A circumferentially extending drive formation of desired shape and size is defined by the molded plastics material, and is molded without a need for conventional measures to compensate for shrinkage. The drive member is formed by first forming a composite preform member that has injection molded thermoplastics material with peripheral por- tions extending about one or more metal inserts. A band-like ring of injection molded thermoplastics material is molded to extend contiguously and continuously about peripheral surface portions of the molded composite preform member, with the plastics material of the band-like ring and of the composite preform member uniting to form a single plastics structure. Because the configuration of the drive surface is determined solely by the molding of the outer band-like ring of thermoplastics material, and because the band-like ring is so thin that it encurs a negligible amount of shrinkage, wheels, gears, pulleys and the like of a very wide range of diameters and torque capacities can be formed inexpensively and accurately without a need to compensate for shrinkage.

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