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| Number | Title | Issue Date |
| 7503818 | Propulsion system for a ship or seagoing vessel A marine drive is engaged with and is driven by a vessel's engine drive shaft. The drive includes: a universal joint secured to the vessel's hull; a first screw shaft supporting a first screw; a first gear set driven by the first screw shaft; a second screw shaft dr... | 03/17/2009 |
| 7334494 | Apparatus for the absorption of rotational vibrations of an internal combustion engine Apparatus for the absorption of torsional vibrations of an internal combustion engine includes an input shaft between the internal combustion engine and the transmission, and a drive shaft of the transmission, which is operatively associated with said input shaft. E... | 02/26/2008 |
| 7270214 | Method and apparatus for reducing and extracting wing-tip vortex energy The present invention provides an apparatus and a method for reducing wing-tip vortex energy during seismic exploration. The apparatus includes a vortex concentrator of deployed proximate a tip of a hydrofoil and a vortex reducing device deployed proximate the vorte... | 09/18/2007 |
| 7186157 | Turning propeller drive for a boat A rotatable propeller drive (1) for a boat, where the propeller drive (1) includes an upper fixing plate (4) adapted for rotationally fixed attachment to the hull bottom (2) of the boat. A lower underwater housing (6) is provided o... | 03/06/2007 |
| 7153101 | Pulling marine propeller A pulling marine propeller (1) including multiple propeller blades (4) attached to a propeller hub (5). The propeller hub (5) is attachable to a propeller shaft (9) extending from a drive housing (10) located downstream of t... | 12/26/2006 |
| 7056092 | Modular propeller A modular propeller comprises a center hub with an integrated front cap and an aluminum core encapsulated with fiber-reinforced composite polymer resin. A set of replaceable blades have bases that slip into and interlock with corresponding slots in the center hub. A... | 06/06/2006 |
| 7056091 | Propeller hub assembly having overlap zone with optional removable exhaust ring and sized ventilation plugs A propeller hub assembly having a through-hub exhaust propeller hub characterized by an interior overlap zone defined by the composite interior dimensions of a selected number of conventional propeller hubs and optionally fitted with a removable exhaust ring and/or ... | 06/06/2006 |
| 6899576 | Twin-propeller drive for watercraft In a watercraft drive for a watercraft having front and rear propellers respectively mounted on a drive shaft in coaxial longitudinally displaced relationship, each of said propellers having at least two blades, the front and rear propellers having equal diameters a... | 05/31/2005 |
| 6599159 | Drive means a boat A boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers which are arranged on that side of the housing facing ahead and the blade areas of which are adapted to one another in such a ... | 07/29/2003 |
| 6562206 | Anode assembly A propeller attachment is disclosed including a body, the body including an anodic material, at least one projection projecting from the body, and a fastener coupled to the body. An anode is also disclosed including an annular body constructed from an ano... | 05/13/2003 |
| 6478641 | Transmission for driving counter-rotating propellers, lubrication system, and associated methods A hybrid gear/sprocket-based transmission is provided for driving a pair of coaxial, counter-rotating propellers in aircraft and airboats. A drive shaft couplable to an engine crank shaft extends rearward into the transmission case, and a pair of coaxial ... | 11/12/2002 |
| 6220906 | Marine propulsion assembly A marine propulsion assembly comprises a drive shaft, a first propeller fixed to the drive shaft and turnable therewith in a first direction, an annular array of gear teeth disposed on the first propeller and turnable therewith, a second propeller aligned... | 04/24/2001 |
| 6193569 | Water jet propulsion unit for use in water borne craft A water jet propulsion unit suitable for use in outboard or stern-drive configuration in motor boats. The unit has an intake section, a pump section and a drive section within which is incorporated a pressure control device and nozzle. In the pump section... | 02/27/2001 |
| 5800223 | Marine propulsion device A marine propulsion device improves the handling characteristics and the responsiveness of the watercraft on which it is used. The propulsion device includes a pair of counter-rotating propellers. At least the blades of the front propeller each have a mea... | 09/01/1998 |
| 5795200 | Contra-rotating rotor unit A marine propulsion unit has two contra-rotating propellers (15, 16) driven by a single shaft (25) through gearing which includes a set of static planetary gears (40), an external gear (30), and an internal gear (44). The gearing is mounted in an oil-fill... | 08/18/1998 |
| 5766047 | Twin propeller marine propulsion unit A twin propeller marine propulsion unit for a watercraft. A vertical drive shaft operably connected to the engine is journaled for rotation in a lower gear case and carries a beveled pinion that drives a pair of coaxial bevel gears. An inner propeller sha... | 06/16/1998 |
| 5759073 | Dual propeller system for marine drive A propulsion system for a marine drive, which includes a pair of counter-rotating propellers, provides improved acceleration from idle or low speeds. Engine exhaust from an engine which powers the marine drive is conveyed to the water about each of the pr... | 06/02/1998 |
| 5697821 | Bearing carrier for outboard drive A bearing carrier and ring nut of a marine outboard drive both attach to a lower unit of the drive by rotating them in the same direction. The bearing carrier includes a threaded front end which screws into a threaded aperture within the lower unit. A rin... | 12/16/1997 |
| 5611718 | Auxiliary propelling device An auxiliary propelling structure can be attached to an existing propeller system including a propeller having a boss, a propeller shaft and a tightening nut screwed onto the end of the shaft. The auxiliary propelling structure includes an auxiliary boss ... | 03/18/1997 |
| 5599215 | Propeller drive system The invention relates to a propeller drive system for a vessel or the like for operating two contra-rotating propellers (1,2) disposed on two coaxial shafts (3,4) in succession. The power supplies of two electric motors (5,6) rotating the propellers (1,2)... | 02/04/1997 |
| 5423701 | Propeller arrangement for a marine propulsion unit A double propeller arrangement for a marine propulsion unit, for example of the type which includes a so-called stern-drive. Each propeller has a hub consisting of an inner sleeve with splines for attachment to a propeller shaft, an outer sleeve with prop... | 06/13/1995 |
| 5376031 | Marine drive with surfacing torpedo A marine drive (10) has two counter-rotating surface operating propellers (12 and 14). The lower horizontal torpedo portion (188) of the housing (20) has an upper zone (276) with outer surface profiles (11T-17T) along horizontal cross-sections defining we... | 12/27/1994 |
| 5376034 | Marine drive exhaust system A surfacing marine drive has a drive housing (20) with a fore exhaust passage (230) forward of the vertical bore (26) housing the driveshaft (36), right and left exhaust passages (232 and 234) extending rearwardly from the fore exhaust passage (230) on op... | 12/27/1994 |
| 5376032 | Marine drive with skeg water inlet A marine drive (10) has a water inlet (234) on the side of the skeg (194). One or more turning vanes (261, 289) receive incoming water flow and turn and direct same forwardly and upwardly within the skeg to a torpedo nose passage (198). A flow divider (28... | 12/27/1994 |
| 5366398 | Marine dual propeller lower bore drive assembly A marine drive (10, 310) has two counter-rotating propellers (12 and 14, 312 and 314). Inner and outer concentric counter-rotating propeller shafts (40 and 42, 340 and 338) are supported by a spool (38, 336) in the lower horizontal bore (28, 328). Passage... | 11/22/1994 |
| 5310371 | Tandem propeller assembly for a marine propulsion unit A tandem propeller assembly for use with a marine propulsion unit is disclosed wherein a single shock-absorber assembly is utilized to assure damping effects for both propellers so as to protect the propulsion system from being damaged when either propell... | 05/10/1994 |
| 5249995 | Marine drive having two counter-rotating surfacing propellers and dual propeller shaft assembly A marine drive (10) has two counter-rotating surface operating propellers (12, 14). Inner and outer concentric counter-rotating propeller shafts (40, 42) are supported by a spool assembly (38) locked and retained against rotation and against axial movemen... | 10/05/1993 |
| 5185545 | Dual propeller shock resistant submersible propulsor unit A high-thrust, shock-resistant submersible propulsor unit comprises of a shroud having a water inlet and a water outlet, a shaft assembly centrally mounted within the shroud, and an upstream and a downstream propeller, each of which includes a separate hu... | 02/09/1993 |
| 5087230 | Drive transmissions In a ships drive transmission, contra rotating propeller shafts are driven by powered means comprising concentric contra rotating drive elements, one of the shafts being connected thereto via epicyclic gearing. The propeller shafts are also coupled to eac... | 02/11/1992 |
| 5078632 | Motorboat propeller To reduce engine exhaust gas pressure behind a motorboat propeller formed with a boss for educing engine exhaust gas therethrough, without forming a trumpet-shaped boss end and without allowing exhaust gas to flow upstream along the boss outer surface, a ... | 01/07/1992 |
| 5030149 | Power transmission arrangement for contra-rotating propeller shafts An arrangement for transferring power of an engine to front and rear propellers of a ship comprises an inner propeller shaft directly coupled to the engine, an outer propeller shaft coupled to the engine via the planetary gear set in a manner such that th... | 07/09/1991 |
| 4993848 | Thrust bearing system for counter-rotating propeller shafts, particularly ships propeller shafts Two propeller shafts are disposed coaxially one within another. A collar of the inner propeller shaft grips into the hollow outer propeller and supports the inner shaft axially over axial friction bearing elements. The axial friction bearing elements are ... | 02/19/1991 |
| 4963108 | Marine contra-rotating propeller drive system A marine contra-rotating propeller system comprises a large gear driven by an engine, and a plurality of small gears disposed so as to respectively mesh with the large gear at a plurality of fixed positions along the circumference of the large gear. Plane... | 10/16/1990 |
| 4887982 | Gear driven marine propulsion system with steerable gearcase and dual counterrotating propellers A marine propulsion system is provided with dual counterrotating propellers, and a shaft and gear arrangement for driving the propellers. In a preferred embodiment, the marine propulsion system includes a depending gearcase having a steerable lower portio... | 12/19/1989 |
| 4871332 | Naval propulsion plant with hydraulic transmission A naval propulsion plant that provides a pair of heat engines MT1 and MT2 that drive two independent pumps P1 and P2. In turn these pumps drive two hydraulic motors MR1 and MR2 with which two propellers E1 and E2 are solid in rotation. A suitable distribu... | 10/03/1989 |
| 4840136 | Propeller drive for boats A double-propeller drive unit for boats, in which the under-water housing of the drive unit is designed so that the pressure center for the transverse force on the drive housing caused by water flow is located in front of the steering axis of the drive un... | 06/20/1989 |
| 4828518 | Double reverse revolution propeller apparatus A double reverse revolution propeller apparatus includes front and rear propeller wherein the rear propeller is rotated at higher speeds than the front propeller. When seizure occurs, an inner shaft is disconnected from an engine at an inner shaft connect... | 05/09/1989 |
| 4795382 | Marine drive lower unit with thrust bearing rotation control A marine drive unit (1) includes a lower gear case (8) forming a torpedo housing (9). A pair of coaxial propeller shafts (21, 25) are rotatably mounted in the housing and carry a pair of propellers (10, 11) thereon. The propeller shafts are driven by a pa... | 01/03/1989 |
| 4792314 | Marine drive with floating spider differential assembly A spider differential assembly (7) of a marine drive is constructed so that the spider (16) and its associated spider pinion gears (20) can float in all directions, except about the common central axis (5) of the propeller drive shafts (4, 8). More partic... | 12/20/1988 |
| 4790782 | Balanced marine surfacing drive A marine stern drive for a boat (3) includes a propeller assembly (36) having a carrier (13) for a pair of concentric drive shafts (12, 19) to which are mounted a pair of closely adjacent fore and aft coaxial surface piercing propellers (21, 22) mounted o... | 12/13/1988 |
