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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Nanami; Masayoshi
Address:
Hamamatsu, JP
No. of patents:
26
Patents:












Patent Number Title Of Patent Date Issued
RE37848 Exhaust cleaning system for marine propulsion engine September 17, 2002
An exhaust cleaning system for a marine propulsion engine that includes a catalyst positioned within a tube that communicates with an expansion chamber. A cooling jacket extends around at least a portion of the exhaust system and the liquid coolant is discharged into the exhaust system f
RE37631 Exhaust timing control for a planing-type boat April 9, 2002
A two-cycle internal combustion engine for a watercraft that includes a cylinder block having a cylinder bore, a piston reciprocating in the cylinder bore and an exhaust port formed in the cylinder block. An exhaust path extends from the cylinder bore for exhausting combustion products
7802530 Personal watercraft September 28, 2010
A personal watercraft can have a steering nozzle pivoting in accordance with the operation of a steering handle unit to change the traveling direction of a vehicle body. A steering position sensor can be configured to detect the steering angle of the steering handle unit. An actuator can
6648702 Control system for small watercraft November 18, 2003
A small watercraft with an emergency shut-off system is provided. The emergency shut-off system is configured to shut off the engine of the small watercraft when the small watercraft is overturned. The emergency shut-off system comprises an electronic control unit that is operatively
6394860 Lubrication system for small watercraft May 28, 2002
A watercraft includes a lubrication system having a lubrication reservoir and a lubricant pump assembly. The lubricant reservoir can be constructed from an upper portion connected to a separate lower portion. The pump assembly can be co-axially aligned with and driven by the crankshaft o
6062179 Fuel-increasing system for an engine May 16, 2000
A method and device for increasing the amount of fuel to an engine during acceleration is provided. A secondary source of fuel in addition to a first source of fuel is introduced into the engine during acceleration. The secondary source of fuel is introduced through a secondary fuel
5853308 Engine and exhaust system for watercraft December 29, 1998
Two embodiments of two-cycle V-type crankcase compression internal combustion engines for powering a jet propelled watercraft. In each embodiment, the pistons of the cylinder banks each drive their own crankshafts which are geared by a transmission to an output shaft. The exhaust sys
5800222 Twin jet drive for watercraft September 1, 1998
A number of embodiments of jet propulsion systems for watercraft that employ twin impellers contained within a common housing assembly at the end of a common inlet duct having a single water inlet opening that can be positioned centrally of the watercraft to avoid drawing air in during
5782214 Exhaust timing control for a planing-type boat July 21, 1998
A two-cycle internal combustion engine for a watercraft that includes a cylinder block having a cylinder bore, a piston reciprocating in the cylinder bore and an exhaust port formed in the cylinder block. An exhaust path extends from the cylinder bore for exhausting combustion products
5749338 Fuel-increasing system for an engine May 12, 1998
A method and device for increasing the amount of fuel to an engine during acceleration is provided. A secondary source of fuel in addition to a first source of fuel is introduced into the engine during acceleration. The secondary source of fuel is introduced through a secondary fuel
5683275 Automatic trim control for jet boat November 4, 1997
A trim adjusting system for a small jet propelled personal watercraft. The trim is adjusted automatically in response to sensed water conditions which will indicate, among other things, the condition of the water flowing through the water inlet opening of the jet propulsion unit. The
5647779 Manifold and water trap system for marine engine July 15, 1997
A personal watercraft having a compact engine arrangement for driving a propulsion device such as a jet pump positioned to the rear of and on the underside of the watercraft. The engine is disposed so that its cylinder block is at an angle to a vertical plane, with the exhaust manifold b
5634832 Induction system for four-cycle watercraft engine June 3, 1997
A number of embodiments of engine induction system configurations for adapting four-cycle, multi-cylinder engines for use in small, personal watercraft. This is accomplished by canting the engine at an angle to a vertically extending plane and positioning the induction system on the
5618213 Twin impeller drive for jet pump April 8, 1997
A jet propulsion unit for a watercraft that employs a pair of counter rotating impellers that are disposed immediately adjacent each other so that the need for straightening vanes is eliminated. The impellers are driven by a bevel gear transmission to rotate in opposite directions, w
5558549 Four cycle engine for watercraft September 24, 1996
A small, personal watercraft powered by a four cycle internal combustion engine. The engine is provided with a dry sump lubrication system for permitting the engine to be mounted low in the hull and this dry sump lubrication system includes a lubricant tank mounted within the hull se
5536187 Outboard jet drive for watercraft July 16, 1996
A jet propelled watercraft having an outboard motor type of jet propulsion unit. The jet propulsion unit is disposed in substantial part forwardly of the transom and beneath the undersurface of the hull for improving its pumping efficiency. The jet propulsion unit is driven by a transmis
5370562 Water injection propulsion device December 6, 1994
An improved steering control for a jet propelled watercraft wherein the steering control is provided by at least a pair of pivotally connected nozzle sections with the upstream nozzle section being pivoted first and the downstream nozzle section being pivoted second so as to permit a
5366401 Exhaust cleaning system for marine propulsion engine November 22, 1994
An exhaust cleaning system for a marine propulsion engine that includes a catalyst positioned within a tube that communicates with an expansion chamber. A cooling jacket extends around at least a portion of the exhaust system and the liquid coolant is discharged into the exhaust system f
5350325 Water injection propulsion device September 27, 1994
A jet propelled watercraft having a reverse thrust mechanism including a reverse thrust bucket. The hull is provided with a portion that underlies the discharge nozzle of the jet propulsion unit and which provides a continuous surface for the hull when the reverse thrust bucket is in the
5338234 Water injection propulsion device August 16, 1994
Several embodiments of water jet propulsion units having variable thrust devices by controlling the effective cross sectional area of the discharge nozzle. The rate of acceleration is sensed and the nozzle opening is changed in response to the sensed rate of acceleration.
5334063 Cooling system for marine propulsion engine August 2, 1994
A number of embodiments of cooling systems for marine propulsion units having water cooled internal combustion engines in which the cooling jacket of the engine is at least partially positioned below the level of the water in which the watercraft is operating. The described embodiments
5031562 Marine steering apparatus July 16, 1991
A combined manual and automatic steering for a watercraft wherein there is provided an automatic steering control and a manual steering control that is operative to override the automatic control upon manual operator actuation.
4813898 Water jet propulsion March 21, 1989
Two embodiments of improved jet drive units for watercraft wherein the jet drive impeller shaft is coupled to the engine drive shaft by a slip spline connection for facilitating removal of the jet drive unit for servicing without removal of the engine. In addition, an improved connection
4811560 Exhaust system for marine propulsion March 14, 1989
Several embodiment of small boats having improved exhaust systems for precluding the entry of water into the engine combustion chambers from the body of water in which the watercraft is operating. In each embodiment, the exhaust system includes a horizontally extending expansion chamber
4773883 Motor for watercrafts September 27, 1988
Two embodiments of small watercraft incorporating an improved exhaust system for handling the exhaust gases from the engine. In each embodiment, at least one expansion chamber is provided for silencing and cooling the exhaust gases and exhaust gases are delivered from the engine exhaust
4765075 Water propulsion unit of water jet propulsion craft August 23, 1988
Several embodiments of water propulsion units for water jet propulsion crafts wherein an improved bearing support is provided for supporting an elongated drive shaft to permit the engine to be positioned well forwardly in the hull. In accordance with each embodiment, the bearing support










 
 
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