US3872851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel supply device for an internal combustion engine
Assignee: Toyota Motor Corp
•
Filing: 1973-05-30
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Granted: 1975-03-25
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Expires: 1993-05-30
Abstract
Abstract In providing a separate supply of fuel to an internal combustion engine when it is started up from a cold condition or as it idles following a cold start up, an additional supply of fuel is withdrawn from the engine carburetor float chamber and is passed through a valve operated fuel well into a fuel chamber. The fuel well is opened when the intake manifold of the engine is at atmospheric pressure for passing fuel into the fuel chamber. A fuel line connects the fuel chamber to the venturi tube for supplying fuel to the engine and a branch pipe, communicating with the fuel line, adds air to the fuel as it is directed into the venturi tube. The passage of fuel through the fuel line is discontinued in response to a temperature sensing arrangement which checks the engine temperature and, when a predetermined temperature level is reached, cuts off the flow through the fuel line to the venturi tube.
Inventors
- 👤 Hirofumi Matsumoto
- 👤 Masahiko Nakada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:19
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
277 words
In an internal-combustion engine comprising a carburetor including a float chamber arranged to contain a supply of fuel, a venturi tube arranged to receive fuel from said float chamber, and an intake manifold arranged to convey the fuel from the venturi tube into the engine, wherein the improvement comprises first means for providing an additional fuel supply for cold start up and idling of the engine, said first means comprises a fuel well connected to said float chamber, a fuel chamber, a conduit connecting said fuel well to said fuel chamber for supplying fuel into said fuel chamber from said fuel well, a valve means for closing off flow from said fuel well through said conduit into said fuel chamber, and pressure means connected to said fuel well for acting on said valve means for opening flow between said fuel well and said fuel chamber when the engine is not operating and for closing flow between said fuel well and said fuel chamber when the engine is operating so that when the engine is inoperative a supply of fuel can be stored in said fuel chamber, second means for conveying fuel from said fuel chamber into said venturi tube, said second means comprising a fuel line connecting said fuel chamber and said venturi tube, and a branch pipe connected to said fuel line and said fuel chamber for introducing atmospheric air into said fuel line, and third means for sensing the temperature of the engine and being connected to said fuel line for discontinuing the flow of fuel therethrough from said fuel chamber to said venturi tube when the temperature of the engine reaches a predetermined level.
Claim 2
Dependent Claim
277 words
In an internal-combustion engine comprising a carburetor including a float chamber arranged to contain a supply of fuel, a venturi tube arranged to receive fuel from said float chamber, and an intake manifold arranged to convey the fuel from the venturi tube into the engine, wherein the improvement comprises first means for providing an additional fuel supply for cold start up and idling of the engine, said first means comprises a fuel well connected to said float chamber, a fuel chamber, a conduit connecting said fuel well to said fuel chamber for supplying fuel into said fuel chamber from said fuel well, a valve means for closing off flow from said fuel well through said conduit into said fuel chamber, and pressure means connected to said fuel well for acting on said valve means for opening flow between said fuel well and said fuel chamber when the engine is not operating and for closing flow between said fuel well and said fuel chamber when the engine is operating so that when the engine is inoperative a supply of fuel can be stored in said fuel chamber, second means for conveying fuel from said fuel chamber into said venturi tube, said second means comprising a fuel line connecting said fuel chamber and said venturi tube, and a branch pipe connected to said fuel line and said fuel chamber for introducing atmospheric air into said fuel line, and third means for sensing the temperature of the engine and being connected to said fuel line for discontinuing the flow of fuel therethrough from said fuel chamber to said venturi tube when the temperature of the engine reaches a predetermined level.
Claim 3
Dependent Claim
116 words
In an internal-combustion engine, as set forth in claim 1, wherein said fuel well has a valve port opening from its lower end into said conduit, said valve means arranged to open and close said valve port, said valve means comprises a valve located in said fuel well for normally maintaining said outlet closed, a piston arranged within said fuel well, and said pressure means comprising a passage connecting said fuel well to said intake manifold so that the pressure within said intake manifold acts on said piston for opening said valve port when said intake manifold is at atmospheric conditions and for closing said valve port when said intake manifold is at negative pressure conditions.
Claim 4
Dependent Claim
130 words
In an internal-combustion engine, as set forth in claim 1, wherein said third means comprises a casing in surface contact with said intake manifold, the interior of said casing being in communication with the atmosphere, a pipe line connecting said casing to said fuel line and said pipe line communicating with said fuel line at a location downstream from the connection of said branch pipe to said fuel line, a bimetal member positioned within said casing, a valve mounted on said bimetal member and arranged to maintain the opening closed when the engine temperature is below a predetermined level and to displace the valve from the opening when the engine temperature reaches a predetermined level for admitting air into said fuel line for discontinuing flow therethrough to said venturi tube.
Claim 5
Dependent Claim
164 words
In an internal-combustion engine, as set forth in claim 1, wherein said fuel well has an outlet from its lower end connected to said conduit, said valve means arranged to open and close said outlet, said valve means comprises a valve member including a valve stem extending upwardly from said valve member, a diaphragm extending across the upper end of said fuel well and dividing it into a lower fuel containing part and an upper diaphragm chamber, and said pressure means comprises a fuel tank, a pipe connecting said fuel tank to said float chamber, a pump for supplying fuel from said fuel tank to said fuel chamber, and a branch line from said pipe connected to said diaphragm chamber downstream from said pump so that the pressure in said pipe is supplied into said diaphragm chamber and when said pump is operating the pressure supplied into said diaphragm chamber depresses the valve downwardly into position for closing the outlet from said fuel well.
Claim 6
Dependent Claim
145 words
In an internal-combustion engine, as set forth in claim 1, wherein a water jacket is provided about a portion of said manifold intake, said third means comprises a temperature sensor arranged to detect the water temperature within said water jacket, solenoid valve having an opening to the atmosphere, pipe line connecting said solenoid valve to said fuel line and said pipe line communicating with said fuel line at a location downstream from the connection of said branch pipe to said fuel line, said solenoid valve arranged to control flow into said pipe line, and an electronic controller connected to said temperature sensor and said solenoid valve so that said temperature sensor signals said electronic controller when the temperature of the water in the water jacket reaches a predetermined level and actuates said solenoid valve for admitting the flow of atmospheric air into said pipe line.
Claim 7
Dependent Claim
179 words
In an internal-combustion engine, as set forth in claim 1, wherein a fuel intake pipe extends between said float chamber and said fuel well and an air pipe located above said fuel intake pipe extends between said float chamber and said fuel well, said fuel chamber having an opening in its lower end, said conduit connecting said fuel well to said fuel chamber is connected to the lower end of said fuel well and to the opening in the lower end of said fuel chamber, a floatable check ball located within said fuel chamber for closing off the opening to said conduit into said fuel chamber when fuel is emptied from said fuel chamber, said fuel line extending upwardly from said fuel chamber to its point of connection to said branch pipe and downwardly to said venturi tube, a first orifice located in said fuel line at the opening from said fuel chamber, and second orifices located in said fuel line and in said branch pipe connected to said fuel line for regulating flow of air and fuel therethrough.
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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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |