Browse Prior Art Database

Molded Outer Shell for Acetal Bearings

IP.com Disclosure Number: IPCOM000085407D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Darveau, CE: AUTHOR [+3]

Abstract

The device as depicted schematically in the figure is an oil-free, light-weight bearing.

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Molded Outer Shell for Acetal Bearings

The device as depicted schematically in the figure is an oil-free, light-weight bearing.

As shown bearing 10 is comprised of inner bearing member 12 and outer bearing member 14. Both the inner bearing member 12 and the outer bearing member 14 are arranged to form a uniform concentric structure, with hole 16 being molded or machined into inner bearing member 12. Inner bearing member 12 is fabricated from a light-weight, self-lubricating low-melting temperature material, for example, acetal. Likewise, outer bearing member 14 is fabricated from a hard-wear resistance, high-melting temperature material, e.g., acrylic.

Since the melting temperature of outer bearing member 14 is substantially higher than the melting temperature of inner bearing member 12, a problem is posed, namely; how to form bearing 10 so that the inner surface of hole 16 which supports the shaft, not shown, is not deformed during the manufacturing of the bearing. This problem is solved by injecting the acetal material under pressure from a conventional plastic press into a mold for the formation of inner bearing member 12. In a similar manner acrylic material is injected to surround inner bearing member 12 to form outer bearing member 14.

In order to prevent the inner bearing member 12 from melting the thickness 18 of outer bearing member 14 is kept within a controlled range. Generally, the range of control for the thickness of outer bearing member 14 is such...