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The NP244 Transfer Case Chain Noise Reduction Using a Gemini HyVo® Chain System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 16, 2005 by SAE International in United States
Annotation ability available
Major revisions for a 2004 model year Sport Utility Vehicle (SUV) included body, suspension, mounting systems, NVH package upgrades, and drivetrain including a new transfer case - the Magna Drivetrain NP244-Gen2 (2nd Generation). During vehicle development, an objectionable level of transfer case chain whine was experienced over a narrow speed range. From vehicle and component testing, the noise was determined to be a transfer case to vehicle systems integration issue excited by the transfer case chain mesh order. The noise issue was solved through passive noise cancellation using a Gemini HyVo® phased sprocket and chain set. The half-pitch phasing of the sprocket and chain pair resulted in near total elimination of the fundamental chain mesh frequency. The NP244-Gen2 is the first transfer case to utilize a phased chain and sprocket system resulting in a best in any class performance for transfer case chain mesh noise.
|Technical Paper||Measurement of Transfer Case Imbalance|
|Technical Paper||Analysis of Noise in Silent Chain Drives|
|Technical Paper||The Gemini Phased Chain System: A New Tool in Automotive Power Transmission|
CitationBecker, S., McAfee, R., and Swanson, J., "The NP244 Transfer Case Chain Noise Reduction Using a Gemini HyVo® Chain System," SAE Technical Paper 2005-01-2298, 2005, https://doi.org/10.4271/2005-01-2298.
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