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1. (WO2017070413) A MARINE PROPULSION ASSEMBLY UTILIZING A DUAL OPPOSED THREADED DRIVE SHAFT WITH TAPER

Pub. No.:    WO/2017/070413    International Application No.:    PCT/US2016/058017
Publication Date: Fri Apr 28 01:59:59 CEST 2017 International Filing Date: Sat Oct 22 01:59:59 CEST 2016
IPC: B63H 23/34
B63H 1/14
B63H 1/20
F16D 1/09
Applicants: ACME MARINS GROUP, LLC
Inventors: DIEKEVERS, Todd
Title: A MARINE PROPULSION ASSEMBLY UTILIZING A DUAL OPPOSED THREADED DRIVE SHAFT WITH TAPER
Abstract:
A marine propulsion assembly (500) includes a propeller (502) having a threaded hub (505) whose threads are used for engaging with a drive shaft (501). The drive shaft includes both a first set of threads (507) and second set of threads such that the first set of threads (507) are used to engage with a keeper nut (514) and a second set of threads are used to engage within the propeller hub (505). The first set of threads (507) are configured to be opposite the direction of propeller rotation for preventing rotation of the keeper nut (514) while the second set of threads are configured opposite the direction of rotation of the propeller to prevent the propeller from loosening on the drive shaft. The drive shaft further includes a tapered section for providing a stop to the propeller when engaging with the second set of threads.