High stress nodular iron gears and method of making same
CA 1108036 A · Owner: General Motors Corporation · Inventors: Grindahl, Robert B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
High STRESS NODULAR IRON GEARS, AND METHOD OF MAKING SAME Abstract of the Disclosure: . High stress acicular bainitic, nodular iron gears, having residual compressive stresses at the surface of the teeth's roots of at least about 40,000 psi and a subsurface residual compressive stress of about 10,000 psi at a depth between about 0.006 inch and 0.015 inch beneath the surface. Method for making gears including: casting nodular iron blank; heating blank to ferritize its microstructure prior to cutting teeth into the blank; heating it in a nonoxidizing environment to an austenitic phase dissolved-carbon-content of about 0.7% to about 1.1%; rapidly quenching the austenitized casting to an …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 1998.
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Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.