Patent US3784172A successfully refreshed from Google Patents.
US3784172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor for internal combustion engines
Assignee: Nissan Motor Co Ltd
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Filing: 1972-10-11
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Granted: 1974-01-08
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Expires: 1992-10-11
Abstract
Abstract A twin carburetor of the variable-area choke type for use in multi-cylinder engine of a motor vehicle which twin carburetor includes a balance tube interconnecting a front side mixture passage and a rear side mixture passage at a point downstream of each throttle valve for balancing the pressures therein to equalize the amounts of air-fuel mixtures to be supplied to individual cylinders of the engine and an additional balance tube interconnecting the front side mixture passage and the rear side mixture passage at a point downstream of each choke for balancing the suctions or depressions acting on each air valve to provide the same effective cross-sectional area at each fuel jet for thereby producing air-fuel mixtures having equal air-fuel ratios in each mixture passage.
Inventors
- 👤 T Sato
- 👤 T Masago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:29
CPC Classifications
F; F02; F02M; F02M13/00; F02M13/02; F02M13/025; F02M7/00; F02M7/12; F02M7/14; F02M7/16; F02M7/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A twin carburetor for an internal combustion engine of a multi-cylinder type comprising at least two mixture passages adapted to supply air-fuel mixtures to groups of individual cylinders of said engine, at least two throttle valves disposed in said mixture passages respectively for controlling the amounts of the air-fuel mixtures to be supplied to said groups of individual cylinders, at least two chokes provided upstream of said throttle valves, respectively, each of said chokes including a movable air valve and a constriction, at least two fuel jets each opening into each of said chokes for supplying fuel thereinto, and a balance tube interconnecting said two mixture passages at a point downstream of said throttle valves for balancing the pressures in said mixture passages downstream of said throttle valves for thereby equalizing the amounts of the air-fuel mixtures to be supplied to said groups of individual cylinders, and an additional balance tube interconnecting said two mixture passages at a point downstream of said chokes for balancing the depressions prevailing therein and acting on said air valves for thereby equalizing the air-fuel ratios of the air fuel mixtures to be supplied to said individual groups of cylinders.
Claim 2
Dependent Claim
195 words
A twin carburetor for an internal combustion engine of a multi-cylinder type comprising at least two mixture passages adapted to supply air-fuel mixtures to groups of individual cylinders of said engine, at least two throttle valves disposed in said mixture passages respectively for controlling the amounts of the air-fuel mixtures to be supplied to said groups of individual cylinders, at least two chokes provided upstream of said throttle valves, respectively, each of said chokes including a movable air valve and a constriction, at least two fuel jets each opening into each of said chokes for supplying fuel thereinto, and a balance tube interconnecting said two mixture passages at a point downstream of said throttle valves for balancing the pressures in said mixture passages downstream of said throttle valves for thereby equalizing the amounts of the air-fuel mixtures to be supplied to said groups of individual cylinders, and an additional balance tube interconnecting said two mixture passages at a point downstream of said chokes for balancing the depressions prevailing therein and acting on said air valves for thereby equalizing the air-fuel ratios of the air fuel mixtures to be supplied to said individual groups of cylinders.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |