US3674245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor for internal-combustion engine
Assignee: Atomjuboll SRL
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Filing: 1970-03-25
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Granted: 1972-07-04
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Expires: 1990-03-25
Abstract
Abstract A carburetor for an internal-combustion engine, equipped with an accelerator-controlled butterfly valve in a mixing channel, has a first fuel-injection nozzle downstream and a second fuelinjection nozzle upstream of that valve, each of these nozzles opening into the channel in the immediate vicinity of a respective high-pressure duct serving to atomize the injected fuel. The atomizer duct for the first nozzle is unblocked under low-load conditions (idling) by a diaphragm-controlled valve responsive to the suction prevailing in the channel beyond the closed butterfly valve. The second nozzle, supplied by an ancillary fuel pump under the control of the accelerator under high-load conditions (kickdown), may have its atomizer duct connected to an air-pressure accumulator which is charged at low load by the pressure differential developed across the butterfly valve.
Inventors
- 👤 Luigi Massarotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:29
CPC Classifications
F; F02; F02M; F02M19/00; F02M19/03; F02M3/00; F02M3/08; F02M7/00; F02M7/06; F02M7/08; Y; Y10; Y10S; Y10S261/00; Y10S261/51
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
A carburetor for an internal-combustion engine, comprising a housing with a channel for an air/fuel mixture aspirated into a combustion chamber; throttle means in said channel movable between a wide-open position and a substantially closed position; a first injection nozzle connected to a first supplemental supply of liquid fuel and opening into said channel downstream of said throttle means; a second injection nozzle connected to a second supplemental supply of liquid fuel and opening into said channel upstream of said throttle means; first atomizing means juxtaposed with said first nozzle and effective in said substantially closed position for dispersing droplets of fuel injected into said channel via said first nozzle; second atomizing means juxtaposed with said second nozzle and effective in said wide-open position for dispersing droplets of fuel injected into said channel via said second nozzle; and pressure-sensitive control means for at least one of said atomizing means communicating with said channel; said first atomizing means comprising a source of highpressure air having an outlet near said first nozzle, said control means including a valve normally blocking the passage of high-pressure air from said source to said outlet and unblocking means for said valve responsive to low pressure in said channel beyond said throttle means.
Claim 2
Dependent Claim
206 words
A carburetor for an internal-combustion engine, comprising a housing with a channel for an air/fuel mixture aspirated into a combustion chamber; throttle means in said channel movable between a wide-open position and a substantially closed position; a first injection nozzle connected to a first supplemental supply of liquid fuel and opening into said channel downstream of said throttle means; a second injection nozzle connected to a second supplemental supply of liquid fuel and opening into said channel upstream of said throttle means; first atomizing means juxtaposed with said first nozzle and effective in said substantially closed position for dispersing droplets of fuel injected into said channel via said first nozzle; second atomizing means juxtaposed with said second nozzle and effective in said wide-open position for dispersing droplets of fuel injected into said channel via said second nozzle; and pressure-sensitive control means for at least one of said atomizing means communicating with said channel; said first atomizing means comprising a source of highpressure air having an outlet near said first nozzle, said control means including a valve normally blocking the passage of high-pressure air from said source to said outlet and unblocking means for said valve responsive to low pressure in said channel beyond said throttle means.
Claim 3
Dependent Claim
43 words
A carburetor as defined in claim 1 wherein said unblocking means comprises a suction chamber provided with a duct terminating at said channel downstream of said throttle means, said control means further including piston means in said suction chamber connected with said valve.
Claim 4
Dependent Claim
15 words
A carburetor as defined in claim 4 wherein said piston means comprises a flexible diaphragm.
Claim 5
Dependent Claim
52 words
A carburetor as defined in claim 1 wherein said control means further comprises an air-pressure accumulator of limited storage capacity having an outlet near said second nozzle and charging means for said accumulator responsive to low pressure in said channel beyond said throttle means during periods of substantial closure of the latter.
Claim 6
Dependent Claim
53 words
A carburetor as defined in claim 4 wherein said accumulator comprises a bellows with a movable partition dividing its interior into a first and a second compartment, said charging means including a suction line extending from a downstream location of said channel to said first compartment, said second compartment communicating with said outlet.
Claim 7
Dependent Claim
32 words
A carburetor as defined in claim 5, further comprising biasing means in said bellows bearing upon said partition in a sense tending to discharge air from said second compartment through said outlet.
Claim 8
Dependent Claim
75 words
A carburetor as defined in claim 6, further comprising a first check valve between said second compartment and said outlet for preventing the flow of air from said channel to said second compartment, and a second check valve between said second compartment and the atmosphere for enabling the aspiration of ambient air into said second compartment upon displacement of said partition against the force of said biasing means by low pressure in said suction line.
Claim 9
Dependent Claim
22 words
A carburetor as defined in claim 1 wherein said second supplemental supply comprises a fuel pump mechanically linked with said throttle means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |