Noise Reduction in a Plastic and Powder Metal Gear Set Through Control of ôMean Involute Slopeö


Recognizes mismatched involute profiles as a cause of tooth meshing noise. Traces a noise reduction process applied to a consumer product with a noisy gearset. (Gearset consists of a powder metal pinion driving a molded plastic gear.) Notes that measurements of profiles on both gears showed a mismatch of pressure angles. Proposes that such a mismatch could be related to “mean involute slope’. Shows that when the mismatch is reduced, noise components drop to acceptable levels.
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