US4148848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air bleed type carburetor
Assignee: Toyota Motor Corp
•
Filing: 1977-11-17
•
Granted: 1979-04-10
•
Expires: 1997-11-17
Abstract
Abstract Disclosed is an air bleed type carburetor for supplying an air fuel mixture to an engine, which carburetor comprises a high altitude control system and a low altitude control system, each system being provided with a control valve device for controlling a bleed air flow to a main jet of the carburetor, and an altitude compensating device for selectively switching the high altitude control system and the low altitude control system in accordance with changes in altitude. The carburetor can supply a desirable air fuel ratio in accordance with changes in altitude and with changes in the operating characteristics of the engine.
Inventors
- 👤 Tamotu Ogita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:36
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/23; F02M7/24; F02M7/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
203 words
An air bleed type carburetor for supplying an air-fuel mixture to an engine, which comprises: an altitude compensating means, communicated with a vacuum supply means and provided with a vacuum port and an air port, said vacuum port being filled with a vacuum supplied from said vacuum supply means and said air port supplying air when the altitude is higher than a predetermined altitude level; a first control valve means for permitting a bleed air flow to pass to a main jet of said carburetor when the operating characteristic of said engine is lower than a predetermined first load level; a second control valve means, communicating said first control valve means to said main jet of said carburetor, which is communicated with said vacuum port of said altitude compensating means for permitting said bleed air flow from said first control valve means to pass at low altitude and for preventing said bleed air flow from occurring at high altitude, and; a third control valve means, communicated with said air port of said altitude compensating means, which permits said bleed air flow to pass at high altitude when the operating characteristics of said engine are lower than those at a predetermined second load level.
Claim 2
Dependent Claim
203 words
An air bleed type carburetor for supplying an air-fuel mixture to an engine, which comprises: an altitude compensating means, communicated with a vacuum supply means and provided with a vacuum port and an air port, said vacuum port being filled with a vacuum supplied from said vacuum supply means and said air port supplying air when the altitude is higher than a predetermined altitude level; a first control valve means for permitting a bleed air flow to pass to a main jet of said carburetor when the operating characteristic of said engine is lower than a predetermined first load level; a second control valve means, communicating said first control valve means to said main jet of said carburetor, which is communicated with said vacuum port of said altitude compensating means for permitting said bleed air flow from said first control valve means to pass at low altitude and for preventing said bleed air flow from occurring at high altitude, and; a third control valve means, communicated with said air port of said altitude compensating means, which permits said bleed air flow to pass at high altitude when the operating characteristics of said engine are lower than those at a predetermined second load level.
Claim 3
Dependent Claim
47 words
An air bleed type carburetor according to claim 1, which further comprises a passage which communicates said air port of said altitude compensating means with said main jet of said carburetor via a throttling element for supplying a bleed air to said main jet at high altitude.
Claim 4
Dependent Claim
54 words
An air bleed type carburetor according to claim 2, wherein said first control valve means is provided with a diaphragm chamber partitioned by a diaphragm and with a valve actuated by said diaphragm, said diaphragm chamber being communicated with an intake passage of said engine for introducing an intake vacuum which actuates said diaphragm.
Claim 5
Dependent Claim
34 words
An air bleed type carburetor according to claim 3, wherein said diaphragm chamber of said first control valve means contains a spring for urging said diaphragm, the urging force of said spring being adjustable.
Claim 6
Dependent Claim
54 words
An air bleed type carburetor according to claim 3, wherein said second control valve means is provided with a diaphragm chamber partitioned by a diaphragm and with a valve actuated by said diaphragm, said diaphragm chamber being communicated with an intake passage of said engine for introducing an intake vacuum which actuates said diaphragm.
Claim 7
Dependent Claim
34 words
An air bleed type carburetor according to claim 5, wherein said diaphragm chamber of said first control valve means contains a spring for urging said diaphragm, the urging force of said spring being adjustable.
Claim 8
Dependent Claim
110 words
An air bleed type carburetor according to claim 2, wherein said altitude compensating means comprises a diaphragm chamber, partitioned by a diaphragm, which is communicated with an intake passage of said engine through said vacuum port and a check valve for controlling an air flow through said air port by way of the intake vacuum supplied from said intake passage, a relief port formed on a wall of said diaphragm chamber, a valve which cooperates with said relief port for switching a vacuum flow through said relief port, and an aneroid bellows, filled with a medium having a predetermined pressure, which displaces said valve in accordance with changes in altitude.
Claim 9
Dependent Claim
26 words
An air bleed type carburetor according to claim 7, wherein the altitude level of said aneroid bellows at which said relief valve is open is adjustable.
Claim 10
Dependent Claim
147 words
An air bleed type carburetor according to claim 2, wherein each of said first and second control valve means is provided with a diaphragm chamber, partitioned by a diaphragm, and with a valve actuated by said diaphragm, said diaphragm chamber being communicated with an intake passage of said engine and containing a spring for urging said diaphragm against the force due to the intake vacuum, and wherein said altitude compensating means comprises a diaphragm chamber, partitioned by a diaphragm, which is communicated with said intake passage of said engine through said vacuum port and a check valve, a relief port formed on a wall of said diaphragm chamber, a valve which cooperates with said relief valve for switching a vacuum flow through said relief port, and an aneroid bellows, filled with a medium having a predetermined pressure, which displaces said valve in accordance with changes in altitude.
References Cited (Backward Citations)
US3548792A
Cited
US3831910A
Cited
US3810606A
Cited
US3857908A
Cited
US3906910A
Cited
US3987131A
Cited
DE2431678A1
Cited
DE2559079A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |