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US 6,912,786 B2Granted
Herringbone gear teeth and method for manufacturing same
AssigneeLufkin Industries, Inc.
InventorsDavid L. Jinkins, Kenneth O. Beckman, Scott A. Franks, Arthur L. Nelson
Life of this patent
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Abstract
A method of manufacturing herringbone gears starting with non-hardened cylindrical stock material, establishing a relief notch for each tooth in the cylindrical stock where the two helices meet, roughing the double helical teeth, and case-hardening the gear teeth. The teeth are then finished using high accuracy Cubic Borzon Nitride (CBN)-faced cutters with the relief notch allowing run-out of the cutters.
Claims13
A process for manufacturing herringbone gears comprising the steps of:
- forming cylindrical features on a stock,
- forming a plurality of relief notches around a circumference of a circle perpendicular to an axis of said cylindrical features,
- roughing a plurality of double helical gear teeth along a helix angle on said stock, with each of said plurality of double helical gear teeth characterized by having an apex located at said circumference and corresponding to one of said plurality of relief notches,
- then hardening said plurality of double helical gear teeth, and
- after said hardening, finishing each of said plurality of double helical gear teeth to a finish profile with a cutter, wherein
- said corresponding relief notch allows travel of said cutter necessary for said finishing step without said cutter removing said stock therein.
3 more elements
Dependencies are inferred from the claim text.