US3866588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for supplying secondary air to a gas engine intake manifold
Assignee: Toyota Motor Corp
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Filing: 1972-10-27
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Granted: 1975-02-18
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Expires: 1992-10-27
Abstract
Abstract In a device operated in response to the pressure in the intake manifold of a gasoline engine, the interior of a housing is divided into an air chamber and a pair of vacuum compartments separated by a diaphragm. The vacuum compartments are connected by a small opening through the diaphragm. One of the vacuum compartments is connected to the intake manifold. A valve is mounted within the housing for regulating flow of atmospheric air through the air chamber to the intake manifold. The valve is connected to the diaphragm and variations in the pressure within the two compartments results in a displacement of the valve for changing the flow of secondary air into the intake manifold. In addition to the intake manifold pressure other engine conditions can be checked and used for supplying the secondary air.
Inventors
- 👤 Masahiko Nakada
- 👤 Takehiko Maekawa
- 👤 Hirofumi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:03
CPC Classifications
F; F02; F02M; F02M23/00; F02M23/04; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S261/00; Y10S261/19; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7748; Y10T137/7749
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
236 words
In a gasoline engine including a carburetor, a device for supplying secondary air into the intake manifold of said engine, said device comprising a housing, means dividing the interior of said housing into a vacuum chamber and a space adjacent to and separated from said vacuuM chamber, an air chamber containing secondary air to be supplied to said intake manifold, a small opening defined to extend completely through said means dividing the interior of said housing and establishing flow communication between said vacuum chamber and said space, first conduit means in communicataion with said air chamber for connecting said air chamber to said intake manifold, displaceable means within said air chamber for selectively admitting and blocking flow to said first conduit means, a connection in said housing opening into said space, second conduit means in communication with said connection in said housing opening into said space for connecting said space to said intake manifold, and means responsive to the operating conditions of said engine and associated with said second conduit means for admitting and blocking flow through said second conduit means to said space based upon the operating conditions of said engine, said displaceable means being arranged to selectively admit and block flow to said first conduit means in accordance with the blocking and admitting of flow to said space through said second conduit means by said means responsive to the operating conditions of said engine.
Claim 2
Dependent Claim
236 words
In a gasoline engine including a carburetor, a device for supplying secondary air into the intake manifold of said engine, said device comprising a housing, means dividing the interior of said housing into a vacuum chamber and a space adjacent to and separated from said vacuuM chamber, an air chamber containing secondary air to be supplied to said intake manifold, a small opening defined to extend completely through said means dividing the interior of said housing and establishing flow communication between said vacuum chamber and said space, first conduit means in communicataion with said air chamber for connecting said air chamber to said intake manifold, displaceable means within said air chamber for selectively admitting and blocking flow to said first conduit means, a connection in said housing opening into said space, second conduit means in communication with said connection in said housing opening into said space for connecting said space to said intake manifold, and means responsive to the operating conditions of said engine and associated with said second conduit means for admitting and blocking flow through said second conduit means to said space based upon the operating conditions of said engine, said displaceable means being arranged to selectively admit and block flow to said first conduit means in accordance with the blocking and admitting of flow to said space through said second conduit means by said means responsive to the operating conditions of said engine.
Claim 3
Dependent Claim
61 words
In a gasoline engine, as set forth in claim 1, including a movably positionable valve means located in the path of flow of the secondary air from said air chamber into said first conduit means downstream of said displaceable means within said air chamber for varying the cross-sectional flow area of flow of the secondary air passing to the intake manifold.
Claim 4
Dependent Claim
36 words
In a gasoline engine, as set forth in claim 2, including means associated with said movably positionable valve means for effecting the positioning of said valve means in accordance with temperature conditions associated with the engine.
Claim 5
Dependent Claim
78 words
In a gasoline engine, as set forth in claim 2, wherein said valve means comprises a passageway connected to said air chamber and said first conduit means, a valve member movably positionable within said passageway and having a variably shaped cross section transversely of the axial direction of said passageway for varying the cross sectional flow area therethrough and for closing off flow through said passageway, and spring means for biasing said valve member into the open position.
Claim 6
Dependent Claim
38 words
In a gasoline engine, as set forth in claim 4, wherein temperature responsive means are associated with said valve member and are arranged to be actuated by a temperature condition determined by the running condition of the engine.
Claim 7
Dependent Claim
76 words
In a gasoline engine, as set forth in claim 5, wherein a shaft is connected to and extends axially from said valve member, a housing enclosing the end of said shaft spaced from said valve member, a resilient material within said housing and embedding the end of said shaft, and a material positioned within said housing in contact with said resilient material which expands and contracts in response to heat for axially displacing said valve member.
Claim 8
Dependent Claim
29 words
In a gasoline engine, as set forth in claim 6, wherein said valve member is conically shaped in the axial direction for varying the flow area through said passageway.
Claim 9
Dependent Claim
88 words
In a gasoline engine, as set forth in claim 1, wherein said housing comprises a body member having an axially extending passageway therethrough, a cover attached to one end of said body member and defining an opening into said housing, said cover and said body member combining to form the air chamber, an air cleaner element positioned within the opening formed by said cover, and a cylindrically shaped member attached to the opposite end of said body member and defining in part the vacuum chamber in said housing.
Claim 10
Dependent Claim
51 words
In a gasoline engine, as set forth in claim 8, wherein said means dividing the interior of said housing comprises a diaphragm connected between said body member and said cylindrically shaped member and extending across said housing defining the separation between the vacuum chamber and the space adjoining the Vacuum chamber.
Claim 11
Dependent Claim
103 words
In a gasoline engine, as set forth in claim 9, wherein said displaceable means within the air chamber comprises a shaft connected at one end to said means connected between said body member and said cylindrically shaped member and extends therefrom through the space adjoining the vacuum chamber into the air chamber, a valve member positioned on said shaft within the air chamber and arranged to form a closure of the flow path through the air chamber, and a spring positioned in the space adjoining the vacuum chamber for biasing said valve member into position for closing off flow through the air chamber.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |