Marine propulsion inventions 03/06

20060068655 - Internal combustion engine including improved balance shaft structure, and personal watercraft incorporating same: An internal combustion engine is provided for a personal watercraft in which a portion of the engine that is enlarged to accommodate a balance shaft is minimized in size, whereby the internal combustion engine is made compact. Balance shafts for preventing secondary vibration are arranged together with a crankshaft on...

20060068656 - Internal combustion engine having an improved oil pan structure for a personal watercraft, and personal watercraft including same: An internal combustion engine for a personal watercraft, the engine including an oil pan in which a lateral width and vertical width thereof are narrow, in compliance with a shape of the boat bottom of the personal watercraft, resulting in an internal combustion engine which is short in overall height....

20060068657 - Quickflush valve kit for flushing and winterizing of cooling system of inboard marine engines, power generators, air-conditioning units, and sailboat engines: A QuickFlush Valve, available in four different versions is a simple, inexpensive device, which allows for a thorough, regular, cost-effective, and convenient flushing or winterizing of cooling systems of inboard marine engines, power generators, and A/C units. At the same time after it is easily installed on boats—either by a...

20060068658 - Engine exhaust system: An engine exhaust system has an exhaust gas passage and a coolant passage. The coolant passage surrounds at least a portion of the exhaust passage. The system is also equipped with an exhaust conduit, which mixes exhaust gases and coolant and then releases the mixture outside of a watercraft. A...

20060057906 - Inflatable floating device: An inflatable floating device includes an inflatable body and a steering device. The inflatable body includes front and rear ends, top and bottom sides, and a through hole extending through the top and bottom sides. The steering device is mounted on the inflatable body, and includes a rotary shaft extending...

20060057909 - Exhaust gate valve apparatus for a personal watercraft: An exhaust gate valve apparatus of a water jet propulsion-driven watercraft is provided that is capable of positively closing an exhaust port with a valve body when an engine is stationary and widely opening the valve body when the engine runs. In the watercraft, an exhaust port of a tail...

20060057907 - Water jet propeller: A water jet propeller for preventing an impeller from being exposed when the water jet propeller is disassembled. The water jet propeller includes a stator disposed at a rear-end portion of an impeller housing, and an impeller is disposed inside the impeller housing. The water jet propeller expels a water...

20060057908 - Water jet propulsion watercraft: A water jet propulsion watercraft that allows accurate speed detection of a speed detection unit to be achieved. A water jet propulsion watercraft includes a hull bottom plate with left and right guide grooves for guiding water rearwardly of the hull. The left and right guide grooves are disposed in...

20060057910 - Dual propeller surface drive propulsion system for boats: The dual propeller surface drive propulsion system for boats is a combined propulsion and steering system for vessels with inboard engines comprising an enclosed thrust bearing assembly mounted to the transom of the vessel, a transom box mounted to the transom of the vessel that encompasses the thrust bearing assembly,...

20060057911 - Shifting device for boat and method of using the same: A shift device for a boat is operated by a shift lever. Movement of the shift lever causes movement of a mechanical actuator. The device comprises means for detecting the positions of the shift lever at specified time intervals and means for obtaining by calculation an estimated time at which...

20060052013 - Outboard motor steering system: In an outboard motor steering system, the engine speed is detected as a value indicative of the speed of the boat and a current value for operating a steering hydraulic cylinder is determined to decrease with decreasing engine speed. The current value can therefore be determined in accordance with the...

20060052014 - Propulsion unit and boat: A propulsion unit can have a propulsion unit connected to a rear surface of a transom plate of a hull. The propulsion unit can have a propeller for producing thrust, a power device for driving the propeller, and a power transmission mechanism for transmitting power from the power device to...

20060052015 - Engine speed control system for outboard motor: In an engine speed control system for an outboard motor, overrev prevention control is implemented which determines whether the engine overrevs by comparing the detected engine speed and a desired speed and responds to a determination that the engine overrevs (in which case the cause of the engine speed increase...

20060046583 - Outboard jet drive marine propulsion system: An outboard jet drive marine system for a boat includes a housing, the housing has front and rear sides, and a top and bottom. The housing is adapted to be affixed behind a hull of a boat. An engine is disposed within the housing. A jet drive unit is releasably...

20060046584 - Transmission set for motorboats: A transmission set for planing motorboats, comprising a fixing bracket (16) which at the same time allows to firmly block the containing box linked and engaged to the stern of the hull, in an absolutely invariable position: said bracket (16) is provided with two longitudinal arms placed in such a...

20060046585 - Remote operation system for outboard motor: A remote operation system for an outboard motor includes a remote control box installed at a cockpit of the boat and a lever attached to a support shaft that is rotatably accommodated in the remote control box for being manipulated by an operator, a plurality of sensors, such as a...

20060046586 - Outboard motor exhaust system: In an outboard motor exhaust system having a first exhaust gas passage discharging engine exhaust gas into water and a shift actuator operating a shift mechanism to establish one from among a forward position, a reverse position and a neutral position, there are provided a second exhaust gas passage branched...

20060046587 - Vessel propulsion system: The present invention relates to a vessel propulsion system and, more specifically, to a vessel propulsion system with improved efficiency and which leads to reduced wave formation, which comprises a propulsion device immersed at least partially in water and which rotates about at least one axis of rotation essentially extending...