Patent US4357609A successfully refreshed from Google Patents.
Patent US4086885A successfully refreshed from Google Patents.
US4086885A
Expired / Lapsed
US
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Carburetor for stratified internal combustion engine
Assignee: Soken Inc
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Filing: 1976-12-30
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Granted: 1978-05-02
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Expires: 1996-12-30
Abstract
Abstract A carburetor for an internal combustion engine of the stratified combustion type supplies a rich air-fuel mixture in the neighborhood of the ignition plug in each cylinder and a lean air-fuel mixture in the remaining space in the cylinder. The carburetor comprises an air horn, a fuel jet having a nozzle open to the air horn, and main and auxiliary ducts branching from the air horn downstream of the fuel nozzle and extending parallel to each other. Air-fuel mixture produced from both air introduced into the air horn and fuel supplied from the fuel jet is led to both the main and auxiliary ducts. At this time, the rich air-fuel mixture is collected in the auxiliary duct, which is closer to the fuel nozzle, and lean air-fuel mixture is collected in the main duct, which is spaced further from the fuel nozzle. The main and auxiliary ducts are respectively provided with main and auxiliary throttle valves, which are controlled by the accelerator pedal.
Inventors
- 👤 Masaaki Noguchi
- 👤 Masaharu Sumiyoshi
- 👤 Yukiyasu Tanaka
- 👤 Taro Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:11
CPC Classifications
F; F02; F02B; F02B17/00; F02B19/00; F02B19/10; F02B19/1019; F02B19/1023; F02B19/1066; F02M; F02M13/00; F02M13/02; F02M13/04; F02M13/046; F02M17/00; F02M17/08; F02M3/00; F02M3/02; F02M3/04; F02M3/045; F02M31/00; F02M31/02; F02M31/04; F02M31/045; F02M31/047; F02M35/00; F02M35/10; F02M35/1015; F02M35/10196; F02M35/104; F02M35/108; F02B2275/00; F02B2275/34; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 58
Claim 1
Independent Claim
484 words
In a torch ignition internal combusion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber; a suction port in communication with said combustion chamber adapted to receive a lean air-fuel mixture; an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith; a suction passage having an open end thereof disposed within said suction port in the vicinity of said valve head adapted to receive a rich mixture; a trap chamber disposed in said cylinder head adapted to receive said rich mixture, said trap chamber having at least one suction aperture through which said rich mixture is introduced into said trap chamber when said intake vavle is opened, said trap chamber also having at least one discharge aperture through which residual gas remaining in said trap chamber is discharged into said combustion chamber; and a spark plug having a set of electrodes exposed to the inside of said trap chamber for igniting the rich mixture introduced thereinto; a carburetor comprising: means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction port and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage to thereby form an air-fuel mixture directly downstream of said fuel supplying means, said air-fuel mixture having a relatively rich portion at a central portion of a cross-sectional area substantially perpendicular to the flow of said air-fuel mixture in said air passage and being relatively lean in the outer portions of said cross-sectional area, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross-sectional area in line with the flow of said rich portion of said air-fuel mixture; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 2
Dependent Claim
484 words
In a torch ignition internal combusion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber; a suction port in communication with said combustion chamber adapted to receive a lean air-fuel mixture; an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith; a suction passage having an open end thereof disposed within said suction port in the vicinity of said valve head adapted to receive a rich mixture; a trap chamber disposed in said cylinder head adapted to receive said rich mixture, said trap chamber having at least one suction aperture through which said rich mixture is introduced into said trap chamber when said intake vavle is opened, said trap chamber also having at least one discharge aperture through which residual gas remaining in said trap chamber is discharged into said combustion chamber; and a spark plug having a set of electrodes exposed to the inside of said trap chamber for igniting the rich mixture introduced thereinto; a carburetor comprising: means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction port and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage to thereby form an air-fuel mixture directly downstream of said fuel supplying means, said air-fuel mixture having a relatively rich portion at a central portion of a cross-sectional area substantially perpendicular to the flow of said air-fuel mixture in said air passage and being relatively lean in the outer portions of said cross-sectional area, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross-sectional area in line with the flow of said rich portion of said air-fuel mixture; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 3
Dependent Claim
443 words
In a torch ignition internal combustion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber; a suction port in communication with said combustion chamber adapted to receive a lean air-fuel mixture; an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith; a suction passage having an open end thereof disposed within said suction port in the vicinity of said valve head adapted to receive a rich mixture; a trap chamber disposed in said cylinder head adapted to receive said rich mixture, said trap chamber having at least one suction aperture through which said rich mixture is introduced into said trap chamber when said intake vavle is opened, said trap chamber also having at least one discharge aperture through which residual gas remaining in said trap chamber is discharged into said combustion chamber; and a spark plug having a set of electrodes exposed to the inside of said trap chamber for igniting the rich mixture introduced thereinto; a carburetor comprising: means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction port and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second pipe having a rich air-fuel mixture receiving orifice and a longitudinal axis proximate said orifice substantially aligned with the direction of flow of said air-fuel mixture in said air passage; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 4
Dependent Claim
443 words
In a torch ignition internal combustion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber; a suction port in communication with said combustion chamber adapted to receive a lean air-fuel mixture; an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith; a suction passage having an open end thereof disposed within said suction port in the vicinity of said valve head adapted to receive a rich mixture; a trap chamber disposed in said cylinder head adapted to receive said rich mixture, said trap chamber having at least one suction aperture through which said rich mixture is introduced into said trap chamber when said intake vavle is opened, said trap chamber also having at least one discharge aperture through which residual gas remaining in said trap chamber is discharged into said combustion chamber; and a spark plug having a set of electrodes exposed to the inside of said trap chamber for igniting the rich mixture introduced thereinto; a carburetor comprising: means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction port and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second pipe having a rich air-fuel mixture receiving orifice and a longitudinal axis proximate said orifice substantially aligned with the direction of flow of said air-fuel mixture in said air passage; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 5
Dependent Claim
442 words
In a torch ignition internal combustion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber; a suction port in communication with said combustion chamber adapted to receive a lean air-fuel mixture; an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith; a suction passage having an open end thereof disposed within said suction port in the vicinity of said valve head adapted to receive a rich mixture; a trap chamber disposed in said cylinder head adapted to receive said rich mixture, said trap chamber having at least one suction aperture through which said rich mixture is introduced into said trap chamber when said intake valve is opened, said trap chamber also having at least one discharge aperture through which residual gas remaining in said trap chamber is discharged into said combustion chamber; and a spark plug having a set of electrodes exposed to the inside of said trap chamber for igniting the rich mixture introduced thereinto; a carburetor comprising: means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction portion and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross-section substantially perpendicular to the flow of said air-fuel mixture in said air passage; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 6
Dependent Claim
442 words
In a torch ignition internal combustion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber; a suction port in communication with said combustion chamber adapted to receive a lean air-fuel mixture; an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith; a suction passage having an open end thereof disposed within said suction port in the vicinity of said valve head adapted to receive a rich mixture; a trap chamber disposed in said cylinder head adapted to receive said rich mixture, said trap chamber having at least one suction aperture through which said rich mixture is introduced into said trap chamber when said intake valve is opened, said trap chamber also having at least one discharge aperture through which residual gas remaining in said trap chamber is discharged into said combustion chamber; and a spark plug having a set of electrodes exposed to the inside of said trap chamber for igniting the rich mixture introduced thereinto; a carburetor comprising: means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction portion and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross-section substantially perpendicular to the flow of said air-fuel mixture in said air passage; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 7
Dependent Claim
73 words
A carburetor as set forth in claim 3, further comprising: area control means pivotally coupled at the top portion of said partition means for varying the sectional area ratio between said first and second intake pipes upstream of said partition means; and link means mechanically connected between said area control means and said first throttle valve, whereby said area control means is pivoted in response to the movement of said first throttle valve.
Claim 8
Dependent Claim
30 words
A carburetor as set forth in claim 3 further comprising: fuel reforming means disposed in said second intake pipe for converting the richer air-fuel mixture into a reformed gaseous mixture.
Claim 9
Dependent Claim
69 words
A carburetor as set forth in claim 5, wherein siad fuel reforming means includes: first and second flame arresting means disposed in said second intake pipe upstream of said second throttle valve; and a spark plug disposed in said second intake pipe between said first and second flame arresting means for imperfectly burning the richer air-fuel mixture, to thereby convert the richer air-fuel mixture into a reformed gaseous mixture.
Claim 10
Dependent Claim
19 words
A carburetor as set forth in claim 5, further comprising: a heat insulator for enclosing said fuel reforming means.
Claim 11
Dependent Claim
163 words
A carburetor as set forth in claim 3 further including air metering means in said air passage upstream from said partition means for metering air flow comprising: an air valve disposed in said air passage and angularly displaceable around an axis; a diaphragm unit coupled to the outside of said air passage, and including a diaphragm disposed in said diaphragm unit for forming a first and a second pressure chamber, and a rod connected at its one end to said diaphragm, the other end thereof being coupled to said air valve; said first pressure chamber being communicated with said air passage downstream of said air valve at a downstream location; said second pressure chamber being communicated with said air passage upstream of said air valve at an upstream location, whereby said diaphragm is displaced in accordance with the pressure difference between the pressures in said first and second pressure chambers, thus to angularly displace said air valve in accordance with said pressure difference.
Claim 12
Dependent Claim
137 words
A carburetor as set forth in claim 8, wherein said fuel supplying means comprises: a float bowl coupled to the outside of said air passage for storing fuel therein; a fuel nozzle opening to said air passage directly downstream of said air valve; a fuel jet tube connected in fluid communication between said fuel nozzle and said float bowl; a needle valve disposed at its one end in said fuel jet tube and longitudinally movable therein; and link means mechanically connected between the other end of said rod and the other end of said needle valve, whereby said needle valve is longitudinally disposed in said fuel jet tube in accordance with the movement of said diaphragm, to thereby control the opening degree of said fuel jet tube in accordance with the longitudinal displacement of said needle valve.
Claim 13
Dependent Claim
60 words
A carburetor as set forth in claim 9, wherein said air metering means includes: an air valve adapter coupled to a downstream side of said air valve in the proximity of said fuel nozzle, whereby the area of the throttled air passage defined between said air valve adapter and the inner wall of said air passage varies continuously and grandually.
Claim 14
Dependent Claim
35 words
A carburetor as set forth in claim 3, further comprising: auxiliary fuel supplying means opening into said second intake pipe for supplying auxiliary fuel thereto under a certain operational condition of said internal combustion engine.
Claim 15
Dependent Claim
132 words
A carburetor as set forth in claim 11, wherein said auxiliary fuel supplying means includes: at least one port opening to said second intake pipe; a fuel passage connected at one end to said port and at the other end to a float bowl storing the fuel therein; a fuel jet disposed in said fuel passage for metering the amount of the fuel flowing therethrough; an auxiliary air passage opening at its one end to said fuel passage and at the other end to the atmosphere; an air jet disposed in said auxiliary air passage for metering the amount of the air passing therethrough; and fuel cut-off means coupled to said auxiliary air passage for controlling the delivery and the stoppage of the fuel through said port to said second intake pipe.
Claim 16
Dependent Claim
28 words
A carburetor as set forth in claim 12, wherein said fuel cut-off means is actuated to stop supplying the fuel when said second throttle valve is suddenly closed.
Claim 17
Dependent Claim
56 words
A carburetor as set forth in claim 12, wherein said auxiliary fuel supplying means further includes: a further air passage opening at one end to said fuel passage and at the other end to the atmosphere; and a further air jet disposed in said further air passage for metering the amount of the air passing therethrough.
Claim 18
Dependent Claim
87 words
A carburetor as set forth in claim 11, wherein said auxiliary fuel supplying means includes: at least one port opening into said second intake pipe; a fuel passage connected at one end to said port and at the other end to a float bowl for storing fuel therein; a fuel jet disposed in said fuel passage for metering the amount of the fuel flowing therethrough; and fuel cut-off means coupled to said fuel passage for controlling the delivery and the stoppage of the fuel through said port.
Claim 19
Dependent Claim
64 words
A carburetor as set forth in claim 15, further comprising: an actuating coil coupled to said fuel cut-off means for actuating the same to close said fuel passage when energized; and a control circuit connected to said actuating coil for energizing the same both (1) when the operational speed of said engine exceeds a predetermined value, and (2) when a gear transmission is disengaged.
Claim 20
Dependent Claim
49 words
A carburetor as set forth in claim 15, further comprising: an auxiliary air passage opening at one end into said fuel passage and at the other end to the atmosphere; and an air jet disposed in said auxiliary air passage for metering the amount of the air passing therethrough.
Claim 21
Dependent Claim
56 words
A carburetor as set forth in claim 15, wherein said fuel cut-off means includes an actuable valve element mounted for movement in said fuel passage between a fuel blocking position and a fuel passing position and means for causing said valve element to move to said blocking position where said second throttle valve is suddenly closed.
Claim 22
Dependent Claim
16 words
A carburetor as et forth in claim 18, wherein said causing means includes an electromagnetic coil.
Claim 23
Dependent Claim
384 words
In a stratified charge internal combustion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber; a spark plug having a set of electrodes exposed to said combustion chamber; a suction port means operatively in communication with said combustion chamber for introducing a lean air-fuel mixture thereto; an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith; and a suction passage means having an open end thereof disposed within said suction port in the vicinity of said valve head for introducing a rich air-fuel mixture into said combustion chamber around said set of electrodes of said spark plug, a carburetor comprising: means defining an air passage connected to one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction port and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross-sectional area substantially perpendicular to the flow of said air-fuel mixture in said air passage; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and the richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 24
Dependent Claim
384 words
In a stratified charge internal combustion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a combustion chamber; a spark plug having a set of electrodes exposed to said combustion chamber; a suction port means operatively in communication with said combustion chamber for introducing a lean air-fuel mixture thereto; an intake valve disposed in said suction port and comprising a valve head and a valve stem integrally associated therewith; and a suction passage means having an open end thereof disposed within said suction port in the vicinity of said valve head for introducing a rich air-fuel mixture into said combustion chamber around said set of electrodes of said spark plug, a carburetor comprising: means defining an air passage connected to one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere to said suction port and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross-sectional area substantially perpendicular to the flow of said air-fuel mixture in said air passage; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and the richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 25
Dependent Claim
73 words
A carburetor as set forth in claim 20, further comprising: area control means pivotally coupled at the top portion of said partition means for varying the sectional area ratio between said first and second intake pipes upstream of said partition means; and link means mechanically connected between said area control means and said first throttle valve, whereby said area control means is pivoted in response to the movement of said first throttle valve.
Claim 26
Dependent Claim
164 words
A carburetor as set forth in claim 20, further including said air metering means in said air passage upstream from said partition means for metering air flow comprising: an air valve disposed in said air passage and angularly displaceable around an axis; a diaphragm unit coupled to the outside of said air passage, and including a diaphragm disposed in said diaphragm unit for forming a first and a second pressure chamber, and a rod connected at its one end to said diaphragm, the other end thereof being coupled to said air valve; said first pressure chamber being communicated with said air passage downstream of said air valve at a downstream location; said second pressure chamber being communicated with said air passage upstream of said air valve at said upstream location, wereby said diaphragm is displaced in accordance with the pressure difference between the pressures in said first and second pressure chambers, thus to angularly displace said air valve in accordance with said pressure difference.
Claim 27
Dependent Claim
137 words
A carburetor as set forth in claim 22 wherein said fuel supplying means comprises: a float bowl coupled to the outside of said air passage for storing fuel therein; a fuel nozzle opening to said air passage directly downstream of said air valve; a fuel jet tube connected in fluid communication between said fuel nozzle and said float bowl; a needle valve disposed at its one end in said fuel jet tube and longitudinally movable therein; and link means mechanically connected between the other end of said rod and the other end of said needle valve, whereby said needle valve is longitudinally disposed in said fuel jet tube in accordance with the movement of said diaphragm, to thereby control the opening degree of said fuel jet tube in accordance with the longitudinal displacement of said needle valve.
Claim 28
Dependent Claim
60 words
A carburetor as set forth in claim 23, wherein said air metering means includes: an air valve adapter coupled to a downstream side of said air valve in the proximity of said fuel nozzle, whereby the area of the throttled air passage defined between said air valve adapter and the inner wall of said air passage varies continuously and gradually.
Claim 29
Dependent Claim
30 words
A carburetor as set forth in claim 20, further comprising: fuel reforming means disposed in said second intake pipe for converting the richer air-fuel mixture into a reformed gaseous mixture.
Claim 30
Dependent Claim
69 words
A carburetor as set forth in claim 25, wherein said fuel reforming means includes: first and second flame arresting means disposed in said second intake pipe upstream of said second throttle valve; and a spark plug disposed in said second intake pipe between said first and second flame arresting means for imperfectly burning the richer air-fuel mixture, to thereby convert the richer air-fuel mixture into a reformed gaseous mixture.
Claim 31
Dependent Claim
19 words
A carburetor as set forth in claim 25, further comprising: a heat insulator for enclosing said fuel reforming means.
Claim 32
Dependent Claim
35 words
A carburetor as set forth in claim 20, further comprising: auxiliary fuel supplying means opening into said second intake pipe for supplying auxiliary fuel thereto under a certain operational condition of said internal combustion engine.
Claim 33
Dependent Claim
132 words
A carburetor as set forth in claim 28, wherein said auxiliary fuel supplying means includes: at least one port opening to said second intake pipe; a fuel passage connected at one end to said port and at the other end to a float bowl storing the fuel therein; a fuel jet disposed in said fuel passage for metering the amount of the fuel flowing therethrough; an auxiliary air passage opening at its one end to said fuel passage and at the other end to the atmosphere; an air jet disposed in said auxiliary air passage for metering the amount of the air passing therethrough; and fuel cut-off means coupled to said auxiliary air passage for controlling the delivery and the stoppage of the fuel through said port to said second intake pipe.
Claim 34
Dependent Claim
28 words
A carburetor as set forth in claim 29, wherein said fuel cut-off means is actuated to stop supplying the fuel when said second throttle valve is suddenly closed.
Claim 35
Dependent Claim
56 words
A carburetor as set gorth in claim 29, wherein said auxiliary fuel supplying means further includes: a further air passage opening at one end to said fuel passage and at the other end to the atmosphere; and a further air jet disposed in said further air passage for metering the amount of the air passing therethrough.
Claim 36
Dependent Claim
87 words
A carburetor as set forth in claim 28, wherein said auxiliary fuel supplying means includes: at least one port opening into said second intake pipe; a fuel passage connected at one end to said port and at the other end to a float bowl for storing fuel therein; a fuel jet disposed in said fuel passage for metering the amount of the fuel flowing therethrough; and fuel cut-off means coupled to said fuel passage for controlling the delivery and the stoppage of the fuel through said port.
Claim 37
Dependent Claim
49 words
A carburetor as set forth in claim 32 further comprising: an auxiliary air passage opening at one end into said fuel passage and at the other end to the atmosphere; and an air jet disposed in said auxiliary air passage for metering the amount of the air passing therethrough.
Claim 38
Dependent Claim
64 words
A carburetor as set forth in claim 32, further comprising: an actuating coil coupled to said fuel cut-off means for actuating the same to close said fuel passage when energized; and a control circuit connected to said actuating coil for energizing the same both (1) when the operational speed of said engine exceeds a predetermined value, and (2) when a gear transmission is disengaged.
Claim 39
Dependent Claim
56 words
A carburetor as set forth in claim 32, wherein said fuel cut-off means includes an actuable valve element mounted for movement in said fuel passage between a fuel blocking position and a fuel passing position and means for causing said valve element to move to said blocking position where said second throttle valve is suddenly closed.
Claim 40
Dependent Claim
16 words
A carburetor as set forth in claim 35, wherein said causing means includes an electromagnetic coil.
Claim 41
Dependent Claim
355 words
In a torch ignition internal combustion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a main combustion chamber; a suction port operatively in communication with said main combustion chamber adapted to receive a lean air-fuel mixture; an auxiliary combustion chamber means disposed in said main combustion chamber for producing and spurting a torch flame into said main combustion chamber; and a suction passage means operatively in communication with said auxiliary combustion chamber for introducing a rich air-fuel mixture thereto, a carburetor comprising: means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere, to said suction port and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross sectional area substantially perpendicular to the flow of said air-fuel mixture in said air passage; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 42
Dependent Claim
355 words
In a torch ignition internal combustion engine comprising: a cylinder; a piston; a cylinder head secured to said cylinder and defining in combination with said piston and cylinder a main combustion chamber; a suction port operatively in communication with said main combustion chamber adapted to receive a lean air-fuel mixture; an auxiliary combustion chamber means disposed in said main combustion chamber for producing and spurting a torch flame into said main combustion chamber; and a suction passage means operatively in communication with said auxiliary combustion chamber for introducing a rich air-fuel mixture thereto, a carburetor comprising: means defining an air passage connected at one end to said suction port and suction passage, and the other end thereof communicating with the atmosphere, said air passage passing air from the atmosphere, to said suction port and suction passage; fuel supplying means opening to said air passage for supplying fuel to said air passage, thereby forming a heterogeneous air-fuel mixture directly downstream of said fuel supplying means, the amount of fuel supplied being so controlled as to be in response to the amount of air passing through said air passage; partition means disposed in said air passage downstream of said fuel supplying means extending substantially parallel to the flow of said air-fuel mixture and be in position between the fuel supply means opening and the opposing wall of the air passage for forming a first intake pipe connected to said suction port and a second intake pipe connected to said suction passage, said second intake pipe being disposed closer to said fuel supplying means than said first intake pipe, said second intake pipe having a rich air-fuel mixture receiving upstream end, said upstream end having a cross sectional area substantially perpendicular to the flow of said air-fuel mixture in said air passage; and a first and a second throttle valve respectively disposed in said first and second intake pipes, said leaner air-fuel mixture being introduced into said suction port in response to opening of said first throttle valve and said richer air-fuel mixture being introduced into said suction passage in response to opening of said second throttle valve.
Claim 43
Dependent Claim
73 words
A carburetor as set forth in claim 37, further comprising: area control means pivotally coupled at the top portion of said partition means for varying the sectional area ratio between said first and second intake pipes upstream of said partition means; and link means mechanically connected between said area control means and said first throttle valve, whereby said area control means is pivoted in response to the movement of said first throttle valve.
Claim 44
Dependent Claim
164 words
A carburetor as set forth in claim 37, further including said air metering means in said air passage upstream from said partition means for metering air flow comprising: an air valve disposed in said air passage and angularly displaceable around an axis; a diaphragm unit coupled to the outside of said air passage, and including a diaphragm disposed in said diaphragm unit for forming a first and a second pressure chamber, and a rod connected at its one end to said diaphragm, the other end thereof being coupled to said air valve; said first pressure chamber being communicated with said air passage downstream of said air valve at a downstream location; said second pressure chamber being communicated with said air passage upstream of said air valve at said upstream location, whereby said diaphragm is displaced in accordance with the pressure difference between the pressures in said first and second pressure chambers, thus to angularly displace said air valve in accordance with said pressure difference.
Claim 45
Dependent Claim
137 words
A carburetor as set forth in claim 39, wherein said fuel supplying means comprises: a float bowl coupled to the outside of said air passage for storing fuel therein; a fuel nozzle opening to said air passage directly downstream of said air valve; a fuel jet tube connected in fluid communication between said fuel nozzle and said float bowl; a needle valve disposed at its one end in said fuel jet tube and longitudinally movable therein; and link means mechanically connected between the other end of said rod and the other end of said needle valve, whereby said needle valve is longitudinally disposed in said fuel jet tube in accordance with the movement of said diaphgram, to thereby control the opening degree of said fuel jet tube in accordance with the longitudinal displacement of said needle valve.
Claim 46
Dependent Claim
60 words
A carburetor as set forth in claim 40, wherein an air metering means includes: an air valve adapter coupled to a downstream side of said air valve in the proximity of said fuel nozzle, whereby the area of the throttled air passage defined between said air valve adapter and the inner wall of said air passage varies continuously and gradually.
Claim 47
Dependent Claim
30 words
A carburetor as set forth in claim 37 further comprising: fuel reforming means disposed in said second intake pipe for converting the richer air-fuel mixture into a reformed gaseous mixture.
Claim 48
Dependent Claim
69 words
A carburetor as set forth in claim 42, wherein said fuel reforming means includes: first and second flame arresting means disposed in said second intake pipe upstream of said second throttle valve; and a spark plug disposed in said second intake pipe between said first and second flame arresting means for imperfectly burning the richer air-fuel mixture, to thereby convert the richer air-fuel mixture into a reformed gaseous mixture.
Claim 49
Dependent Claim
19 words
A carburetor as set forth in claim 42, further comprising: a heat insulator for enclosing said fuel reforming means.
Claim 50
Dependent Claim
35 words
A carburetor as set forth in claim 37, further comprising: auxiliary fuel supplying means opening into said second intake pipe for supplying auxiliary fuel thereto under a certain operational condition of said internal combustion engine.
Claim 51
Dependent Claim
132 words
A carburetor as set forth in claim 45, wherein said auxiliary fuel supplying means includes: at least one port opening to said second intake pipe; a fuel passage connected at one end to said port and at the other end to a float bowl storing the fuel therein; a fuel jet disposed in said fuel passage for metering the amount of the fuel flowing therethrough; an auxiliary air passage opening at its one end to said fuel passage and at the other end to the atmosphere; an air jet disposed in said auxiliary air passage for metering the amount of the air passing therethrough; and fuel cut-off means coupled to said auxiliary air passage for controlling the delivery and the stoppage of the fuel through said port to said second intake pipe.
Claim 52
Dependent Claim
28 words
A carburetor as set forth in claim 46, wherein said fuel cut-off means is actuated to stop supplying the fuel when said second throttle valve is suddenly closed.
Claim 53
Dependent Claim
56 words
A carburetor as set forth in claim 46, wherein said auxiliary fuel supplying means further includes: a further air passage opening at one end to said fuel passage and at the other end to the atmosphere; and a further air jet disposed in said further air passage for metering the amount of the air passing therethrough.
Claim 54
Dependent Claim
87 words
A carburetor as set forth in claim 45, wherein said auxiliary fuel supplying means includes: at least one port opening into said second intake pipe; a fuel passage connected at one end to said port and at the other end to a float bowl for storing fuel therein; a fuel jet disposed in said fuel passage for metering the amount of the fuel flowing therethrough; and fuel cut-off means coupled to said fuel passage for controlling the delivery and the stoppage of the fuel through said port.
Claim 55
Dependent Claim
49 words
A carburetor as set forth in claim 49 further comprising: an auxiliary air passage opening at one end into said fuel passage and at the other end to the atmosphere; and an air jet disposed in said auxiliary air passage for metering the amount of the air passing therethrough.
Claim 56
Dependent Claim
64 words
A carburetor as set forth in claim 49, further comprising: an actuating coil coupled to said fuel cut-off means for actuating the same to close said fuel passage when energized; and a control circuit connected to said actuating coil for energizing the same both (1) when the operational speed of said engine exceeds a predetermined value and (2) when a gear transmission is disengaged.
Claim 57
Dependent Claim
56 words
A carburetor as set forth in claim 49, wherein said fuel cut-off means includes an actuable valve element mounted for movement in said fuel passage between a fuel blocking position and a fuel passing position and means for causing said valve element to move to said blocking position when said second throttle valve is suddenly closed.
Claim 58
Dependent Claim
16 words
A carburetor as set forth in claim 52, wherein said causing means includes an electromagnetic coil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |