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1. 发明专利

JPH10131807A FUEL SUPPLY MECHANISM OF MEMBRANE TYPE CARBURETTER 失效
公开(公告)号：JPH10131807A
公开(公告)日：1998-05-19
申请号：JP30254596
申请日：1996-10-28
申请人： HONDA MOTOR CO LTD , NIPPON WALBRO KK
发明人： KIKUTA TAKAHIRO , TOGASHI MICHIYASU , SUZUKI MASAO , TOBIUCHI TERUHIKO , KUROKI NOBUYUKI , OKANE SHINICHI , KOBAYASHI TAKESHI
IPC分类号： F02M7/08 , F02M1/16 , F02M17/04
摘要： PROBLEM TO BE SOLVED: To enable vaporized fuel IN a constant pressure fuel chamber to normally flow to an intake passage little by little together with fuel irrespective of the posture of an engine, thereby preventing much vaporized fuel from remaining in the chamber. SOLUTION: A membrane type carburetter supply fuel to a fuel nozzle 16 protruding to an intake passage from a constant pressure fuel chamber 30 of a carburetter main body 12 is provided with a fuel sump 28 at almost the center of the chamber 30. One of ends of the sump 28 is communicated with the nozzle 16 via. a check valve 26 and fuel jet 20 while the other is closed with a cover plate in which a through hole 30a is formed which communicates the sump 28 with the center of the chamber 30. A plurality of fuel passages 61 are provided whose dia. is the same as the through hole 30a radially extending from the sump 28 and being communicated with the circumferential edge of the chamber 30.

2. 发明专利

JP2001082252A CONSTANT VACUUM SLIDE THROTTLE VALVE TYPE CARBURETOR 失效
公开(公告)号：JP2001082252A
公开(公告)日：2001-03-27
申请号：JP25857399
申请日：1999-09-13
申请人： NIPPON WALBRO KK
发明人： OU GIYOUTOU , KOBAYASHI TAKESHI
IPC分类号： F02M7/17 , F02M20060101
摘要： PROBLEM TO BE SOLVED: To provide a constant vacuum slide throttle valve type carburetor having a simple constitution, a reduced manufacturing cost, a slide throttle calve movement swift and excellent in acceleration performance, and a high air suction efficiency. SOLUTION: A negative pressure chamber 14 is disposed on the upper side of a diaphragm 5 and an atmospheric pressure chamber 13 is disposed on the lower side of the diaphragm 5 by connecting an upper cover 4 to an upper end wall of a carburetor body 6 with a diaphragm 5 placed between them. A cup-shaped slide throttle valve 22 is supported in a liftable manner in a cylindrical part 17 crossing perpendicularly with an intake passage 33 of the carburetor body 6. The upper end of a negative pressure actuating valve 26 inserted into the slide throttle valve 22 is connected to the diaphragm 5. The stroke of the negative pressure actuating valve 26 is smaller than than of the slide throttle valve 22. Accordingly, only slide throttle valve 22 is actuated in a small opening range, and the slide throttle valve 22 and the negative pressure actuating valve 26 are integrally actuated in an opening range exceeding the small opening range. A lower end flange 26a of the negative pressure actuating valve 26 is inserted into the slide throttle valve 22. A spring 2a is interposed between a upper end cover plate 23 of the slide throttle valve 22 and the lower end flange 26a of the negative pressure actuating valve 26.

3. 发明专利

JP2000186624A CONSTANT VACUUM SLIDING THROTTLE VALVE TYPE CARBURETOR 失效
公开(公告)号：JP2000186624A
公开(公告)日：2000-07-04
申请号：JP36770098
申请日：1998-12-24
申请人： NIPPON WALBRO KK
发明人： O GIYOUHIGASHI , KOBAYASHI TAKESHI
IPC分类号： F02M9/06
摘要： PROBLEM TO BE SOLVED: To provide a constant vacuum sliding throttle valve type carburetor, especially for a motorcycle, whose structure is simple and which is quick is operation and is excellent in acceleration performance. SOLUTION: An upper cover 4 is connected to the upper end wall of a carburetor body 6 so as to hold a diaphragm 5, thus a negative pressure chamber 14 and an atmospheric chamber 13 can be partitioned respectively on the upper and lower sides of the diaphragm 5. The upper end of a sliding throttle valve 26 elevatably supported in an opening 17 being perpendicular to the intake passage 33 of the carburetor body 6 is connected to the diaphragm 5, and a forked throttle valve lever 8 and a rotary shaft 7 fixing the throttle valve lever 8 are arranged in the atmospheric chamber 13. A valve plate 22 arranged separately from a sliding throttle valve 26 is arranged elevatably from the fully closing position of the intake passage 33 to the fully opening position thereof, and stroke from a low opening area to the fully opening position that previously set in the sliding throttle valve 26 is set smaller than the stroke of the valve plate 22. Therefore, the valve plate 22 only is operated in the low opening area, and the valve plate 22 is operated integrally with the sliding throttle valve 26 in an opening area exceeding the low opening area.

4. 发明专利

JPH11351061A CARBURETOR OF CONSTANT-VACUUM SLIDING THROTTLE VALVE TYPE 失效
公开(公告)号：JPH11351061A
公开(公告)日：1999-12-21
申请号：JP17218398
申请日：1998-06-04
申请人： NIPPON WALBRO KK
发明人： KOBAYASHI TAKESHI
IPC分类号： F02M7/17
摘要： PROBLEM TO BE SOLVED: To provide a carburetor, especially for a motorcycle, of a constant- vacuum sliding throttle valve type that is simple in construction, smooth in operation and excellent in acceleration performance. SOLUTION: An upper cover 4 is coupled to the upper end wall of a carburetor body 6 or is placed over a diaphragm 5 to define an upper or vacuum chamber 14 and a lower or atmospheric chamber 13. To the diaphragm 5, a sliding throttle valve 26 is connected for vertical movement in an opening 17 orthogonal to an intake passage 33 defined in the carburetor body 6. On a support shaft 7 disposed in the atmospheric chamber 13, a biforked throttle value operating lever is coupled and a follower lever 8 is furthermore supported for idle rotation. The follower lever 8 is coupled at its tip to the sliding throttle valve 26. The throttle lever is mounted on its one fork with a journalled forced- control lever, and a lateral projection on the follower lever 8 is spring-loaded between the other fork of the throttle lever and the forced-control lever within the range between the idle position and preset opening level of the throttle lever, so that the follower lever 8 is rotated clockwise or counterclockwise.

5. 发明专利

JPH09280114A CARBURETOR FOR TWO-STROKE CYCLE ENGINE 失效
公开(公告)号：JPH09280114A
公开(公告)日：1997-10-28
申请号：JP11573496
申请日：1996-04-12
申请人： NIPPON WALBRO KK
发明人： TOBIUCHI TERUHIKO , TERAKADO HITOSHI , OONUMA MICHIROU , KOBAYASHI TAKESHI
IPC分类号： F02M7/00 , F02B75/02
摘要： PROBLEM TO BE SOLVED: To individually suitably adjust the amount of air supplied to each scavenging port of an engine in response to the opening of the throttle valve of a carburetor. SOLUTION: An air passage 25 is connected to a portion near the scavenging port 33, 33A of a scavenging passage 33a for connecting the scavenging ports 33, 33A to a crank room 39a in an engine A and is provided with a check valve 27 for allowing air to flow to the scavenging passage 33a. An air control valve C which controls the air flow of the air passage 25 in interlocking with the check valve 15 is interposed between an air cleaning device D and an carburetor B. The air control valve C is composed of a rotary throttle valve and the valve element 5 of the air control valve C has the same number of valve ports as the scavenging ports 33, 33A crossing the valve element 5 and the diameter of each valve port is different in response to the circumferential position in the cylinder 32 of the scavenging ports 33, 33A.

6. 发明专利

JPH09268918A CARBURETTOR FOR 2-CYCLE INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH09268918A
公开(公告)日：1997-10-14
申请号：JP10618796
申请日：1996-04-03
申请人： KOMATSU ZENOA KK , NIPPON WALBRO KK
发明人： WATANABE YUJI , TOBIUCHI TERUHIKO , TERAKADO HITOSHI , OONUMA MICHIROU , KOBAYASHI TAKESHI
IPC分类号： F02B33/04 , F02B25/20 , F02B25/22 , F02M19/00
摘要： PROBLEM TO BE SOLVED: To provide a carburettor for a 2-cycle internal combustion engine in which an opening operation characteristic of an air control valve can be adjusted in respect to a degree of opening of a throttle valve in the carburettor. SOLUTION: An air passage 25 is connected to a part near a scavenging port 33 of a scavenging passage 33a for communicating the scavenging port 33 of a 2-cycle internal combustion engine with a crank chamber 39a. A check valve 27 for allowing a flow of air toward the scavenging passage 33a is arranged at the air passage 25. There is provided an air control valve C for controlling an amount of air supplied from an air cleaner D to the air passage 25. Mixture gas of air and fuel is supplied from the air cleaner D to the crank chamber 39a through the carburettor B and a check valve 37a. In order to open or close the air control valve C in cooperation with the opening or closing operation of a throat valve 15 of the carburettor B, both an operation lever for driving the throttle valve 15 and a lever of the air control valve C are connected by a connecting rod 13 in such a way that a relative space between them can be adjusted.

7. 发明专利

JPH09268917A CARBURETTOR FOR 2-CYCLE INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH09268917A
公开(公告)日：1997-10-14
申请号：JP10618696
申请日：1996-04-03
申请人： KOMATSU ZENOA KK , NIPPON WALBRO KK
发明人： WATANABE YUJI , TOBIUCHI TERUHIKO , TERAKADO HITOSHI , OONUMA MICHIROU , KOBAYASHI TAKESHI
IPC分类号： F02B33/04 , F02B25/20 , F02B25/22 , F02B75/02 , F02M19/00
摘要： PROBLEM TO BE SOLVED: To provide a carburettor for 2-cycle internal combustion engine in which its configuration is simple, small in size, an air control valve is cooperatively connected to a throttle valve of the carburettor and a degree of opening of a valve is not disturbed between air passages. SOLUTION: An air passage 25 is connected to a part near a scavenging port 33 of a scavenging passage 33a for communicating a scavenging port 33 opened or closed by a piston 34 and a crank chamber 39a. A check valve 27 for allowing a flow of air directed toward a scavenging passage 33a is arranged at the air passage 25. An air control valve C for controlling an amount of air in the air passage 25 in cooperation with the throttle valve 15 is held between an air cleaner D and a carburettor B, and then the air cleaner D, the air control valve C and the carburettor B are integrally fixed to a main body A of the engine.

8. 发明专利

JPH09177614A DIAPHRAGM TYPE CARBURETOR OF FOUR STROKE ENGINE FOR PORTABLE WORKING VEHICLE 失效
公开(公告)号：JPH09177614A
公开(公告)日：1997-07-11
申请号：JP34979695
申请日：1995-12-21
申请人： NIPPON WALBRO KK
发明人： OONUMA MICHIROU , KOBAYASHI TAKESHI
IPC分类号： F02M17/04 , F02M37/12
摘要： PROBLEM TO BE SOLVED: To prevent the rotational fluctuation or defective acceleration when the fuel vapor is generated in a low pressure fuel chamber by providing a vapor removing pump in which the depression at engine manifold of an intake pipe is the driving source, and the fuel vapor generated in the low pressure fuel chamber is returned to a fuel tank in a diaphragm type carburetor of four-stroke engine for a portable working vehicle. SOLUTION: When an engine is operated at high speed, and the depression at engine manifold of a venturi part 16a becomes strong, a diaphragm 78 in a vapor removing pump B is sucked against a spring 72 in the suction stroke of the engine, and the fuel vapor of a constant pressure fuel chamber 25 of a constant pressure fuel feed mechanism A is sucked into a pump chamber 75 through a pipe 35 and a non-return valve 69. When the depression at engine manifold of the venturi 16a becomes weak in the other stroke, the diaphragm 78 is pushed back by the spring 72, and the fuel vapor of the pump chamber 75 is discharged into a fuel tank 37 through a non-return valve 73, a throttle 70, and a pipe 36. A vapor removing pump B is operated and the fuel vapor from the constant pressure fuel chamber 25 is discharged into the fuel tank 37 to obtain the constantly stable the engien speed.

9. 发明专利

JPH09158806A FILM TYPE CARBURETER FOR 4-STROKE INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH09158806A
公开(公告)日：1997-06-17
申请号：JP34485695
申请日：1995-12-06
申请人： NIPPON WALBRO KK
发明人： OONUMA MICHIROU , KOBAYASHI TAKESHI
IPC分类号： F02M37/12
摘要： PROBLEM TO BE SOLVED: To prevent the discharge pressure of a film type fuel pump using the intake negative pressure of an intake pipe from being increased to excess by low-load operation of an engine. SOLUTION: In a film type carbureter for a 4-stroke internal combustion engine loaded on a portable working machine, an operating chamber 8 of a film type fuel pump 11 includes a passage 61 communicated with a part of an intake passage 16 downstream from a throttle valve 17 and a passage 60 communicated with a part of the intake passage 16 upstream from the throttle valve 17. The passage 61 is provided with a throttle 61b. The intake negative pressure of the intake passage 16 is utilized for the driving force for the film type fuel pump 11, thereby sucking fuel from a fuel tank 37 to be forced-fed to a constant-pressure fuel chamber 25.

10. 发明专利

JPH084589A STARTING FUEL FEEDING DEVICE FOR CARBURETOR 失效
公开(公告)号：JPH084589A
公开(公告)日：1996-01-09
申请号：JP16054394
申请日：1994-06-20
申请人： NIPPON WALBRO KK
发明人： KOBAYASHI TAKESHI
IPC分类号： F02M1/04 , F02M1/16 , F02M7/08 , F02M17/04 , F02M19/12
摘要： PURPOSE:To provide a starting fuel feeding device for a carburetor which is disposed in a limited space as in a portable working machine and small and easy to operate. CONSTITUTION:A starting shaft 21 paralleling a throttle valve stem 14 is supported at the end part on the connection side of the air purifier of a carburetor body 15 and a plunger 6 is reciprocated by a cam 21a consisting of a notch formed in the starting shaft 21 and a shaft peripheral surface. The plunger 6 crosses the starting shaft 21 at right angles between the throttle valve shaft 14 at the interior of the carburetor body 15 and the starting shaft 21. The plunger 6 is disposed in the middle of starting fuel passages 8 and 7 and air-fuel mixture for starting is fed through starting fuel passages 8, 7, 35, and 37 to the part, situated downstream from a throttle valve 32, of an intake air passage 31.

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