Endless belt power transmission systems or components – Positive drive pulley or guide roll – Having nonmetallic component
Patent
1988-01-29
1990-08-07
Bui, Thuy M.
Endless belt power transmission systems or components
Positive drive pulley or guide roll
Having nonmetallic component
29892, 29983, 29984, F16H 5514
Patent
active
049464272
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 portions 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 commposite 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 neglibible 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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Bui Thuy M.
Burge David A.
Jepmar Research
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