Chain noise damping device

Patent No. 7,862,460

Issued: January 4, 2011
Appl. No.: 12/159,241
Filed: January 22, 2007
PCT Filed: January 22, 2007
PCT No.: PCT/US2007/060822
371(c)(1),(2),(4) Date: June 26, 2008
PCT Pub. No.: WO2007/087501
PCT Pub. Date: August 02, 2007

Inventors: Chekansky; Jason W. (Auburn, NY), Markley; George L. (Montour Falls, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)

A sprocket (S) for a chain driven power transmission system used on an internal combustion engine. Severe ITVH (Noise, Vibration, Harshness) characteristics associated with a chain engaging the sprocket is damped by two annular rings (R1, R2) that are loosely positioned on either side of the circumferential row of teeth. The inner diameters (ID1, ID2) of each of the annular rings (R1, R2) form cavities between the annular rings and the sprocket grooves. Pressurized viscous fluid is supplied to each cavity via channels in the hub of the sprocket to cushion the impact of each roller of the chain as it engages each row of teeth during engine operation. The pressure of the viscous fluid creates a resistive force to minimize the severe impact noise experienced by non-damped sprockets.

Reference to Related Applications

This application claims one or more inventions which were disclosed in Provisional Application No. 60/762,176, filed Jan. 25, 2006, entitled "Chain Noise Damping Device". The benefit under 35 USC .sctn.119(e) of the United States provisional application is hereby claimed. The aforementioned applications are hereby incorporated by reference.

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