Class 440/89J - Silencer, expansion chamber, muffler

Subclass of Class 440 - Marine propulsion
No. of patents: 52
Last issue date: 08/18/2009

Number	Title	Issue Date
7575492	Muffler support structure for a small boat A muffler support mechanism for a small boat is capable of reducing the number of parts required to fix a water muffler. The muffler support mechanism includes a second water muffler mounted on a left recess of a support plate. A bracing flotation member is mounted ...	08/18/2009
7390232	Exhaust system for a marine engine An exhaust system for a marine propulsion system includes first through fifth exhaust conduit members, including a pair of serially connected marine exhaust elbows laterally spanning the engine. ...	06/24/2008
7367857	Exhaust structure for small watercraft To provide an exhaust structure for a small watercraft that can cool exhaust gas, reduce the size and weight, and thereby cost of a backflow prevention chamber. An exhaust structure for a small watercraft is configured to be able to cool exhaust gas in the course of...	05/06/2008
7288010	Personal watercraft A personal watercraft including a body including a hull and a deck covering the hull from above, an engine accommodated in an interior of the body, and an exhaust system that is accommodated in the interior of the body. The exhaust system includes an upstream muffle...	10/30/2007
7160162	Exhaust system for internal combustion engine of outboard motor An exhaust system that reduces noise generated by exhaust gases is provided. The exhaust system includes a drive unit that supports an internal combustion engine. An exhaust guide forms an upper portion of the case. An oil pan is attached to a lower surface of the e...	01/09/2007
7156710	Exhaust system for small-sized boat An exhaust system for a small-sized boat which can efficiently reduce exhaust noises in a low frequency band includes a water muffler provided at one location along exhaust pipes extending from an engine disposed in a boat body. The inside of the water muffler is di...	01/02/2007
7140935	Small jet propulsion watercraft A small jet propulsion watercraft 10 is provided with side wall portions 14a and 14b formed on both the left and right sides of a stepping platform 13, within which water lock devices 36 and 37 are disposed, re...	11/28/2006
7056174	Drainage structure of exhaust resonator The invention is directed at increasing the degree of freedom in layout of the resonator, and the exhaust system including the resonator will be improved. Also, the invention is directed at a resonator and exhaust system wherein when an attempt is made to raise the ...	06/06/2006
6997128	Stand-up type personal watercraft A stand-up type personal watercraft comprises a body including a hull and a deck covering the hull from above, the body having a foot deck at a rear portion of the deck, on which an operator rides, a water jet pump configured to propel the watercraft, and a four-cyc...	02/14/2006
6939185	Exhaust system for small watercraft and personal watercraft An exhaust system for a small watercraft is disclosed, wherein the exhaust system includes an exhaust chamber having a predetermined volume, within which an exhaust gas discharged from an engine flows, the exhaust gas containing water supplied at a position of the e...	09/06/2005
6896568	Exhaust outlet equipment of small watercraft and pipe mounting structure Exhaust outlet equipment provided at a downstream end portion of an exhaust passage of a propulsion engine in a flow of an exhaust gas, wherein the engine is mounted in a small watercraft propelled by a water jet pump. The exhaust outlet equipment typically includes...	05/24/2005
6855022	Personal watercraft A first exhaust chamber and a second exhaust chamber are disposed within a body of a watercraft. The first exhaust chamber communicates with an exhaust port of an engine through a first exhaust pipe. A first space of the first exhaust chamber communicates with the s...	02/15/2005
6837173	Watercraft A watercraft is described with a powered hull and deck. The deck includes a forward passenger area and a rearward passenger area connected by a passageway. A windshield extends upwardly from the deck at a position forward of the rearward passenger area. An engine is...	01/04/2005
6755705	Water drain conduit between exhaust pipe and expansion chamber for a watercraft An exhaust system for a personal watercraft that includes a water drain conduit coupling the exhaust pipe to the expansion chamber. The water drain conduit is located at the lowest point of the exhaust pipe and expansion chamber. ...	06/29/2004
6739921	Exhaust structure of exhaust system for a boat An exhaust system for a small boat is constructed in such a manner that an exhaust pipe extends rearwardly from an engine provided in a hull of the boat. A water muffler is provided in the exhaust pipe, and exhaust gas is discharged through a water lock pipe extendi...	05/25/2004
6679742	Exhaust structure for a jet propulsion watercraft To provide an exhaust structure for a jet propulsion watercraft which can simply achieve a reduction of the exhaust noise. In the exhaust structure for a jet propulsion watercraft, a water jet propeller is provided in a pump room of a watercraft body. An ...	01/20/2004
6659821	Exhaust structure for jet propulsion boat An exhaust structure for a jet propulsion engine in which exhaust noise can be reduced. The exhaust structure includes a tunnel-shaped pump chamber provided at a the rear portion of a hull, a jet pump provided in a pump chamber, a driving engine connected...	12/09/2003
6616491	Exhaust structure of personal watercraft Disclosed is an exhaust structure of a jet-propulsion personal watercraft adapted to eject water pressurized and accelerated by a water jet pump from an outlet port so as to be propelled as the resulting reaction, which is configured to cause an exhaust g...	09/09/2003
6506086	Exhaust system for watercraft An exhaust system for a watercraft includes an improved construction of an exhaust silencer in which inlet and outlet conduits are arranged without interfering with each other. An inlet conduit is arranged to deliver the exhaust gases to the silencer. An ...	01/14/2003
6120335	Catalytic exhaust system for watercraft A personal watercraft includes a catalytic exhaust system in order to reduce discharge of pollutants. The exhaust system includes an exhaust passage and a catalyzer that is located within an expansion chamber of the exhaust passage. A water jacket is prov...	09/19/2000
6113446	Exhaust arrangement for small watercraft An engine for a watercraft has an exhaust system having an exhaust pipe and an expansion chamber. The exhaust pipe has a plurality of runners corresponding to the number of cylinders in the engine. The runners extend upward to a merge point and then longi...	09/05/2000
6027384	Four-cycle engine for a small jet boat A four-cycle engine is provided which is suitable for use in a vehicle or an apparatus such as a small jet boat to be operated on the premise that it often overturns, and which is simple in structure. An oil pan 22 is disposed below the bottom of a crankc...	02/22/2000
5983631	Exhaust control for watercraft engine An exhaust control for an internal combustion engine powering a watercraft is disclosed. The exhaust control includes an exhaust manifold connected to the engine and having a passage therethrough leading from an exhaust passage extending from a combustion...	11/16/1999
5846102	Four-cycle engine for a small jet boat A four-cycle engine is provided which is suitable for use in a vehicle or an apparatus such as a small jet boat to be operated on the premise that it often overturns, and which is simple in structure. An oil pan 22 is disposed below the bottom of a crankc...	12/08/1998
5822985	Exhaust passage structure of outboard motor unit An exhaust passage structure is provided for an outboard motor unit having an engine holder mounted to a hull through a bracket, an engine disposed to an upper portion of the engine holder, a drive shaft housing disposed to a lower portion of the engine h...	10/20/1998
5743206	Hull for small watercraft An improved hull for watercraft provides a secondary access port to an engine compartment. The secondary access port facilitates service or maintenance of certain engine components (e.g., spark plugs) which are hard to reach from the main access port, whe...	04/28/1998
5719358	Arrangement for muffling the exhaust sound of a boat motor A muffler for muffling the exhaust sound of a motor boat having a diesel motor. The exhaust gases of the motor are led to a buffer chamber that is located beneath the waterline of the boat and mounted on a trim tab fitted to the transom of the boat. The b...	02/17/1998
5699749	Exhaust system, hull, and speed indicator for watercraft A personal watercraft exhaust system, hull underplate, and speed sensor and sponson arrangement. The exhaust system for the engine provides a compact assembly that incorporates a pair of expansion chamber devices on opposite sides of the tunnel to provide...	12/23/1997
5655937	Water-lift muffler evacuation device A device is disclosed which allows water-lift mufflers, silencers or suppressors to be fully flushed, while in or out of the water, without running the engines. The device can be mounted between a remote access panel or control panel and a conventional fr...	08/12/1997
5584733	Personal jet propelled watercraft Several embodiments of personal watercraft being adapted to accommodate at least two riders seated in straddle, tandem fashion. The watercraft are powered by a combined jet propulsion unit and powering internal combustion engine which is positioned vertic...	12/17/1996
5550337	Exhaust system for a small planing craft An exhaust silencing system for a small planing craft includes a first expansion chamber housing on one side of a water craft which transmits exhaust gases and waste cooling water to a second expansion chamber housing which may have a number of expansion ...	08/27/1996
5511505	Personal watercraft with V-type engine A number of embodiments of small personal watercraft each embodying a V-type engine. Arrangements are shown wherein the engine is mounted either with its output shaft extending in a longitudinal direction or in a vertical direction. Various placements for...	04/30/1996
5433634	Exhaust treatment for outboard motor An exhaust system for a marine propulsion outboard drive wherein the exhaust gases are normally discharged to the atmosphere at a point below the level of the body of water in which the watercraft is operating. A catalyst bed is provided in the exhaust sy...	07/18/1995
5374209	Internal combustion engine exhaust system An outboard motor comprising a propulsion unit including a propeller shaft, and an internal combustion engine drivingly connected to the propeller shaft and including a V-shaped cylinder block having first and second cylinder banks including respective fi...	12/20/1994
5329074	Marine engine exhaust muffler An exhaust muffler for mounting on the transom of a powerboat in association with the exhaust pipes which extend through the transom. The muffler comprises a housing extending laterally across the stern of the boat and rearwardly from the transom to defin...	07/12/1994
5280708	Exhaust gas purifying device for an outboard motor An exhaust gas purifying arrangement is provided for an outboard motor for a watercraft. At least one exhaust port is provided which opens into a first exhaust passage having a first catalyst member lining at least a portion of its inner wall. The first e...	01/25/1994
5253603	Underwater vehicle muffler A muffler for use with an underwater vehicle. The muffler is mechanically attached to an exhaust tube or aft end of the underwater vehicle and has an hydrodynamic shape and perforated exterior that results in the production of less noise by the vehicle. L...	10/19/1993
5196655	Muffler for marine engine An improved muffler for silencing the exhaust emitted from a water cooled marine engine comprising a housing enclosure partitioned by an angularly disposed inner planar baffle, the housing having an inlet for the exhaust gas and cooling water to fluidly c...	03/23/1993
5096446	Exhaust silencer unit for propulsion unit A number of embodiments of exhaust silencers for marine propulsion units including an exhaust device having a first expansion chamber, a pair of second expansion chambers and a third expansion chamber all formed within a common housing. The flow of exhaus...	03/17/1992
5048291	Exhaust muffler for marine engines with two rows of cylinders An exhaust muffler for marine engines with two rows of cylinders, especially V-engines. The exhaust muffler comprises a horizontal cylindrical container (20) mounted transverse to the rows of cylinders and having an exhaust inlet (26) and an exhaust outle...	09/17/1991

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Class 440/89J - Silencer, expansion chamber, muffler