US4010723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas cleaning apparatus for an internal combustion engine for a vehicle
Assignee: Toyota Motor Corp
•
Filing: 1975-12-30
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Granted: 1977-03-08
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Expires: 1995-12-30
Abstract
Abstract An exhaust gas cleaning apparatus for an internal combustion engine for a vehicle having a carburetor including an air bleed system to bleed air into a fuel line of said carburetor, and having an exhaust gas recirculation valve including a diaphragm mechanism which is controlled by negative pressure in said carburetor to recirculate a part of said exhaust gas from the exhaust manifold to the intake manifold. The apparatus comprises another air bleed system to bleed air to the fuel line of the carburetor and valve means for communicating said other air bleed system and said diaphragm mechanism of the exhaust gas recirculation valve with the atmosphere in response to negative pressure in the venturi of said carburetor and in the intake manifold.
Inventors
- 👤 Katsumi Suziki
- 👤 Katsunori Kawatake
- 👤 Hiroshi Sawada
- 👤 Hiroki Matsuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:43
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/23; F02M7/24; F02M7/28; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M26/64; F02M2026/001; F02M2026/009
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
An exhaust gas cleaning apparatus for an internal combustion engine for a vehicle having a carburetor including an air bleed system to bleed air to a fuel line of said carburetor, and having an exhaust gas recirculation valve including a diaphragm mechanism which is controlled by negative pressure in said carburetor so as to recirculate a part of said exhaust gas from the exhaust manifold in the intake manifold, said apparatus comprising: a second air bleed system to bleed air to the fuel line of said carburetor; and valve means for communicating said second air bleed system and said diaphragm mechanism of the exhaust gas recirculation valve with the atmosphere, in response to negative pressure in the venturi of said carburetor and intake manifold, thereby both the recirculating operation of a part of the exhaust gas and the supplying operation of a rich air-fuel mixture to the engine can be attained during the accelerating operation of the vehicle.
Claim 2
Dependent Claim
158 words
An exhaust gas cleaning apparatus for an internal combustion engine for a vehicle having a carburetor including an air bleed system to bleed air to a fuel line of said carburetor, and having an exhaust gas recirculation valve including a diaphragm mechanism which is controlled by negative pressure in said carburetor so as to recirculate a part of said exhaust gas from the exhaust manifold in the intake manifold, said apparatus comprising: a second air bleed system to bleed air to the fuel line of said carburetor; and valve means for communicating said second air bleed system and said diaphragm mechanism of the exhaust gas recirculation valve with the atmosphere, in response to negative pressure in the venturi of said carburetor and intake manifold, thereby both the recirculating operation of a part of the exhaust gas and the supplying operation of a rich air-fuel mixture to the engine can be attained during the accelerating operation of the vehicle.
Claim 3
Dependent Claim
203 words
An exhaust gas cleaning apparatus according to claim 1, wherein said valve means comprises: a casing; a first diaphragm means mounted at one side of said casing and operable by negative pressure in said venturi of said carburetor, second diaphragm means mounted at the other side of said casing and operable by negative pressure in the engine intake manifold, a first pipe member arranged in said casing and opened at both ends, said first pipe member being connected to a vacuum chamber of the diaphragm mechanism of the exhaust gas recirculation valve; a second pipe member which is arranged in the casing and which is opened at both ends, said second pipe member being connected to the second air bleed system, a first valve member which is connected to the first diaphragm means so as to communicate one end of each of said first and second pipe members with the atmosphere in response to the negative pressure in the venturi of the carburetor, and a second valve member which is connected to the second diaphragm means so as to communicate the other ends of said first and second pipe member with the atmosphere in response to the vacuum in the engine intake manifold.
Claim 4
Dependent Claim
31 words
An exhaust gas cleaning apparatus according to claim 2, wherein said first diaphragm means has a vacuum chamber which is connected to a port defined in the venturi of the carburetor.
Claim 5
Dependent Claim
30 words
An exhaust gas cleaning apparatus according to claim 2, wherein said second diaphragm means has a vacuum chamber which is connected to a port defined in the engine intake manifold.
References Cited (Backward Citations)
US3948236A
Cited
US3906910A
Cited
US3915136A
Cited
US3926161A
Cited
US3951115A
Cited
US3970052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |