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US 9,746,067 B2Granted
Gear having improved surface finish
AssigneeUnited Technologies Corporation
InventorsClark V. Cooper, Sonia Tulyani, Edward J. Karedes, Jefferi J. Covington, Alexander Staroselsky, Harsh Vinayak
Life of this patent
Estimating the term…
Abstract
There is a gear set. The gear set has a) a first gear having a first surface and b) an intermeshing second gear having a second surface. The first and second surfaces each, independently, have an isotropic arithmetic mean roughness, Ra, of about 0.0762 micrometers/3 microinches or less and are lubricated. There is also a method for increasing the contact surface-fatigue life of a gear set.
Claims7
A gear set, comprising:
- a first gear having a first surface;
- and
- an intermeshing second gear having a second surface,
- wherein the first and second surfaces each, independently, have an arithmetic mean roughness of about 0.0762 micrometers/3 microinches or less, the first surface and the second surface are lubricated with a polyol ester lubricant and the first and second surfaces each have a lambda value of 1.0 to 2.0, the first gear and the second gear having a power density increase for pitting failure of about 52% versus as-ground gears having an as-ground lambda value of about 0.3.
1 more element
Dependencies are inferred from the claim text.