Harley-davidson Motor Company Group, LLC

Richard G Pierson

Alexander John Bozmoski

John W Schanz

Sean A Rusch

Scott J Nash

Samir Mesanovic

Brian P Dondlinger

Peter J Duvernell

Paul Nan-Jiune Liang

William M Kernen

Stacy L Smith

William P Pari

Timothy R Osterberg

Michael P Christopherson

Anthony L Coffey

Michael R Richter

Michael A Selwa

A primary housing for a motorcycle engine includes an inner housing that defines internal coupling apertures, transmission coupling apertures, and external coupling apertures. Internal fasteners extend through the internal coupling apertures and the transmission coupling apertures to couple the inner housing to the crankcase and the transmission. An outer housing defines coupling apertures that align with the external coupling apertures and fasteners extend through the coupling apertures, through the external coupling apertures, and into the engine crankcase to couple the inner and outer housings to the crankcase. A resonant damping device is rigidly or moveably coupled to an anti-node region of the outer housing to reduce noise emissions from the outer housing during engine operation.

Primary housing assembly for a motorcycle engine

The present invention provides a method of operating a dynamic exhaust system of a motorcycle engine. The method includes providing a valve in the exhaust system that is movable to direct exhaust gases between a first flow path through the exhaust system and a second flow path through the exhaust system. The method includes actuating the valve at a first speed to redirect exhaust gases from the first flow path to the second flow path and actuating the valve at a second speed greater than the first speed to redirect exhaust gases from the second flow path to the first flow path.

Motorcycle dynamic exhaust system

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New Berlin, WI, United States of America

Richard G Pierson