Manual transmission using chain and planetary gear set as final drive

Patent No. 8,562,476

Issued: October 22, 2013
Filed: May 12, 2009
PCT Filed: May 12, 2009
PCT No.: PCT/US2009/043534
371(c)(1),(2),(4) Date: February 11, 2011
PCT Pub. No.: WO2009/140229
PCT Pub. Date: November 19, 2009
Term Extension: 316 days

Inventors: Simpson; Roger T. (Ithaca, NY), Michaels; Mark E. (Homer, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


A transmission for an engine or motor with a reduced package size and increased efficiency comprising: an input sprocket, an output sprocket, a chain, and a planetary gear set. The output sprocket is drivingly connecting to the input sprocket through the chain. The output sprocket has a hollow center portion that receives the sun gear of the planetary gear set. The planetary gear set also includes at least two planet gears meshed with the sun gear which are mounted to a fixed planet carrier for driving a differential with a ring gear portion. When the input sprocket is rotated in a first direction, the chain drives the output sprocket and the sun gear in the first direction, and the sun gear drives the planet gears to rotate in a second direction, opposite the first direction, driving the ring gear portion and differential in the second direction.

Reference to Related Applications

This application claims one or more inventions which were disclosed in Provisional Application No. 61/053,773, filed May 16, 2008, entitled "MANUAL TRANSMISSION USING CHAIN AND PLANETARY GEAR SET AS FINAL DRIVE". The benefit under 35 USC .sctn.119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.


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