The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 2025
Filed:
Mar. 03, 2022
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Zf Marine Propulsion Systems Miramar, Llc, Miramar, FL (US);
Andrew Orvieto, Plantation, FL (US);
Keith Stanley, Coral Springs, FL (US);
Dave Gruenwald, Oshkosh, WI (US);
Bryan Danner, Oshkosh, WI (US);
ZF Friedrichshafen AG, Friedrichshafen, DE;
ZF MARINE PROPULSION SYSTEMS MIRAMAR, LLC, Miramar, FL (US);
Abstract
A marine propulsion system, supported by a strut, which comprises an inner propeller shaft supporting a first propeller adjacent a trailing end thereof, and the inner propeller shaft is connected to the drive shaft for receiving and supplying a first portion of torque to the first propeller as well as transfer thrust, generated by the first propeller, along the inner propeller shaft back to the drive shaft. An outer propeller shaft supports a second propeller adjacent a trailing end thereof, and the outer propeller shaft surrounds the inner propeller shaft. A planetary gear assembly receives a second portion of the torque and supplies the torque to the outer propeller shaft so that the second propeller rotates in an opposite direction to the first propeller. A portion of the planetary gear assembly is accommodated vertically above a flat end face of the strut for reducing hydrodynamic drag of the strut.