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Auxiliary marine vessel propulsion system

a technology for auxiliary marine vessels and propulsion systems, applied in marine propulsion, propulsive elements, vessel construction, etc., can solve the problems of a certain amount of hydrodynamic drag on the rudder, and achieve the effects of high torque, efficient operation, and increased power

Inactive Publication Date: 2012-04-05
SAUDI ARABIAN OIL CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0014]The above objects and further advantages are provided by the apparatus, system and method of the invention in which the main propulsion and drive system of a merchant vessel such as a freighter or tank vessel, or a military vessel is supplemented by an auxiliary propulsion and drive system that includes at least one, but preferably a pair of propellers which flank the main propeller and which are attached via a drive shaft, through a gear train, which can optionally include a clutch mechanism, to an auxiliary motor or motors. It will be understood by one of ordinary skill in the art that use of a single auxiliary propeller, positioned either port or starboard of the main propeller will require the rudder to be turned in order to maintain a straight ahead course. This positioning of the rudder creates a certain amount of hydrodynamic drag. Use of two auxiliary propellers eliminates this use of the rudder.

Problems solved by technology

This positioning of the rudder creates a certain amount of hydrodynamic drag.

Method used

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  • Auxiliary marine vessel propulsion system
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  • Auxiliary marine vessel propulsion system

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Embodiment Construction

[0037]Referring to FIG. 1, a propulsion system 10 for a merchant vessel or the like is schematically depicted, including a main propulsion and drive subsystem 12 and a pair of auxiliary propulsion drive subsystems 14a and 14b, collectively referred to as 14, that can be operated independently of the main propulsion and drive subsystem 12. Generally, the main propulsion and drive subsystem 12 propels the vessel under normal operating conditions in accordance with known and conventional practices. According to the present invention, if the main propulsion drive subsystem 12 fails, or when the main propulsion drive subsystem 12 must be shut down for routine or unscheduled maintenance while at sea, the auxiliary propulsion drive subsystem 14 is used to propel the vessel, thereby offering reliable back-up propulsion. As will be understood by one of ordinary skill in the art, in a preferred embodiment the pair of auxiliary systems 14a and 14b flank the main drive system 12 at correspondin...

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Abstract

The main propulsion and drive system of a merchant vessel such as a freighter or tank vessel, or a military vessel is supplemented by an auxiliary propulsion and drive system that includes at least one, but preferably a pair of auxiliary propellers that flank the main propeller at port and starboard positions and each of which are attached via a drive shaft through a gear train, which can optionally include a clutch mechanism, to an auxiliary motor or motors. In order to reduce the drag when the main propeller is disabled, segments of a wake field modifying propeller duct are mounted for repositioning to form at least a partial housing or cowling that diverts the water over the exterior surface of the duct and minimizes contact with the stationary blades of the main propeller as the vessel moves through the sea when powered by the auxiliary propulsion system.

Description

RELATED APPLICATIONS[0001]Not applicableBACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to vessel propulsion systems, and more particularly to an auxiliary vessel propulsion system employing one or more controllable pitch propellers.[0004]2. Description of Related Art[0005]Propellers have been the primary mode of propulsion for merchant marine and military vessels since they replaced paddle-wheel and wind-driven sailing vessels in the early 20th century. While the scale, materials of construction, shape and engines have developed substantially over the past 100 years, the configuration of choice has essentially remained constant—single engine / single propeller design.[0006]The tremendous scale and complexity of primary drive engines requires scheduled and unscheduled maintenance for optimum operation. For proper service, the vessel should be anchored or drifting. Additionally, engine failure is a problem which, while not necessarily very common,...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B63H21/17B63H3/00B63H5/14B63H1/14B63H20/14
CPCB63B2241/10B63H3/00B63H5/08Y02T70/70B63H23/30B63J2003/046Y02T70/542B63H5/16Y02T70/00Y02T70/50
Inventor AL BABTAIN, AHMED ABDULRAHMAN A.
Owner SAUDI ARABIAN OIL CO
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