Assignee: Walbro Japan, Inc.

Location: Tokyo, JP
No. of patents: 30

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Number	Title	Issue Date
7287741	Rotary throttle valve carburetor A rotary throttle valve carburetor includes a main body defining a mixing passage and a valve bore, and a throttle valve rotatably received in the valve bore to selectively open and close the mixing passage. The carburetor main body includes an integral throttle val...	10/30/2007
7267327	Throttle valve assembly and dust seal for a carburetor A carburetor has a throttle valve assembly with a cam member and cam surface internally arranged in a body of the carburetor. The cam member is carried by the throttle valve body and preferably has outwardly extending tabs for locking engagement within slots formed ...	09/11/2007
7152852	Priming system for a float bowl carburetor A float bowl type carburetor has a fuel and air mixing passage extending therethrough, a float bowl assembly, a priming pump communicated with the float bowl assembly and a fuel supply pipe that is communicates fuel in the float bowl assembly with the fuel and air m...	12/26/2006
7114708	Rotary throttle valve carburetor A rotary throttle valve carburetor includes a body having a fuel and air mixing passage and a throttle valve movable between idle and wide open positions. A valve bore is increasingly aligned with the fuel and air mixing passage as the throttle valve is moved from i...	10/03/2006
7097162	Carburetor with fuel vapor control A carburetor includes a body having a fuel and air mixing passage formed therein and an opening in fluid communication with the fuel and air mixing passage, a fuel metering assembly carried by the body and including a fuel metering diaphragm that defines at least pa...	08/29/2006
7007931	Rotary throttle valve carburetor A rotary throttle valve carburetor includes an air intake passage and a throttle valve bore formed in a carburetor body, a cam disposed in the throttle valve bore, and a throttle valve disposed in the throttle valve bore so that one end engages the cam and the other...	03/07/2006
6945520	Starting assembly for a carburetor A starting device for a rotary throttle valve-type carburetor enables adjustment of the quantity of air and fuel delivered to an engine to facilitate the cold start of the engine. The starting device changes the position of the throttle valve prior to starting the e...	09/20/2005
6928996	Stratified scavenging mechanism of a two-stroke engine A stratified scavenging mechanism of a two-stroke internal combustion engine including a carburetor for supplying and controlling an air and fuel mixture to the engine, an air intake passage in which a throttle valve is disposed, an air passage provided on a scaveng...	08/16/2005
6896245	Stratified scavenging carburetor A stratified scavenging carburetor with a lost motion coupling permits limited relative movement of a throttle valve relative to an air valve so that initial opening of the throttle valve off idle does not open the air valve to avoid diluting with scavenging air the...	05/24/2005
6871843	Carburetor with idle fuel supply arrangement An idle fuel supply device for a carburetor has an idle air passage that communicates with an air intake passage and a fuel chamber. A passage extending from a fuel metering chamber is connected to the fuel chamber preferably via a fuel adjusting needle valve. A low...	03/29/2005
6827337	Rotary throttle valve carburetor A rotary throttle valve carburetor has a fuel-and-air mixing passage which extends through a carburetor body. A cylindrical throttle chamber extends down from a top surface of the body and communicates transversely with the fuel-and-air mixing passage. A rotary thro...	12/07/2004
6769670	Starting assembly for a carburetor A starting device for a rotary throttle valve-type carburetor enables adjustment of the quantity of air and fuel delivered to an engine to facilitate the cold start of the engine. The starting device changes the position of the throttle valve prior to starting the e...	08/03/2004
6736613	Acceleration fuel pump having a resilient check valve member for a combustion engine carburetor An acceleration fuel pump for use with a combustion engine carburetor is an integral part of the carburetor body and provides an additional flow of fuel to the fuel-and-air mixing passage of the carburetor during acceleration of the engine. The acceleration fuel pum...	05/18/2004
6672570	Variable venturi carburetor A variable venturi carburetor for a combustion engine has an uprighted cup-shaped piston head which forms an integral part of a venturi within a fuel-and-air mixing passage carried by a carburetor body, and a needle that projects rigidly downward from the...	01/06/2004
6644631	Diaphragm-type carburetor A diaphragm-type carburetor has a body defining at least in part an air intake passage, a fuel metering chamber that receives fuel for delivery into the air intake passage, a fuel supply passage communicating a supply of fuel with the fuel metering chambe...	11/11/2003
6606971	Small engine fuel injection system A fuel injection system injects a rich mixture of fuel-and-air directly into a cylinder of a two cycle engine through an intake port for combustion. A charge forming device of the fuel injection system carries a primary air intake passage which flows air ...	08/19/2003
6491288	Carburetor fuel mixture adjustment assembly A carburetor fuel mixture adjustment assembly has a threadable holder which suppresses rotation of a needle valve body disposed within an elongated receptacle defined within a carburetor body. The threadable holder is rigidly engaged within a threading ch...	12/10/2002
6481699	Acceleration device for a two-cycle engine An acceleration device of a carburetor for a two cycle engine with a rotary dual valve which controls air flow through both a scavenging passage and a separate air intake passage each extending through a carburetor body. The carburetor body houses a meter...	11/19/2002
6467757	Carburetor valve adjustment limiter cap assembly A limiter cap assembly of a carburetor for a two cycle engine restricts maximum and minimum fuel amounts. The limiter cap assembly has a first cap engaged telescopically to the end of a low speed needle valve and a second cap engaged telescopically to the...	10/22/2002
6425573	Carburetor with vapor purge pump A membrane fuel pump (A) is driven by the pulsating pressure of intake air of an engine. Fuel in the fuel tank (80) is supplied to a constant-pressure fuel chamber (30) through valve (22), and further to an intake passage through a fuel nozzle (16). A mem...	07/30/2002
6418891	Internal combustion engine A two-stroke internal combustion engine having an air control arrangement which controls scavenging air flow during rapid engine acceleration to optimize the acceleration and maximum power output of the engine while maintaining low exhaust emissions from ...	07/16/2002
6394425	Carburetor with a rotary throttle valve A rotary throttle valve type carburetor including an air intake passage extending through a carburetor body, a cylindrical valve chamber formed perpendicularly to the air intake passage, a throttle valve inserted into the valve chamber, and a throttle val...	05/28/2002
6382598	Fuel flow control device for diaphragm-type carburetor An improved fuel flow control device of a diaphragm-type carburetor having a lever which can be easily coupled to a flow control valve body. The lever has a resilient portion which flexes to permit a cooperating portion of the valve body to pass thereby a...	05/07/2002
6382599	Carburetor with accelerator A circuit for delivering fuel into a valve chamber of a rotary throttle valve type carburetor. The fuel delivery circuit includes a fuel supply nozzle, protruding into the valve chamber and fixed at the bottom of the valve chamber to the carburetor body, ...	05/07/2002
6349925	Carburetor for two-stroke engine A carburetor for a two stroke engine with an air passage and a separate fuel and air mixing passage in a carburetor body and the passages having an air valve and a throttle valve, respectively. A coupling connects a valve shaft of the air valve with a val...	02/26/2002
6347787	Carburetor with air and throttle valve for two-cycle engine A carburetor for providing a fuel and air mixture and a scavenging air supply to a two stroke internal combustion engine has a throttle valve received in a fuel and air mixing passage and connected to a throttle drive for controlling engine operation and ...	02/19/2002
6347788	Carburetor with fuel jet support structure A fuel jet supporting structure for a carburetor includes a support column (5) provided with a fuel passage which introduces fuel to an air intake passage (9). The fuel passage includes a fuel passage bore (24), an air passage bore (19), a threaded bore (...	02/19/2002
6334606	Carburetor for stratified type scavenging engine A carburetor for a stratified type scavenging engine has a scavenging air supply passage with an air valve therein, a fuel and air mixture passage having a throttle valve therein, a diaphragm which defines a negative pressure chamber on one side and an at...	01/01/2002
5599484	Construction of a fuel supply pipe in a rotary throttle valve type carburetor A construction of a fuel supply pipe with a proximal end press-fit portion formed of metal and a metering tip portion formed of synthetic resin. The metering tip portion, formed with a fuel jet therein, is telescopically connected to the proximal end pres...	02/04/1997
5554322	Apparatus for supplying starting-fuel for a carburetor A carburetor with a main fuel jet and a throttle valve in a mixing passage and an apparatus for automatically supplying an enriched fuel and air mixture when an engine is cranked for starting and initial running of the engine upon starting. The apparatus ...	09/10/1996

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Assignee: Walbro Japan, Inc.