Patent US4020805A successfully refreshed from Google Patents.
US4020805A
Expired / Lapsed
US
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Intake manifold flow equilizing means
Assignee: Toyota Motor Corp
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Filing: 1975-12-11
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Granted: 1977-05-03
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Expires: 1995-12-11
Abstract
Abstract An intake manifold for a multicylinder internal combustion engine has a riser connectable to a carburetor and branch pipes connecting the riser and each suction port of respective cylinders of the engine, and is characterized by being provided with orifice means located at a position in each said branch pipe for defining the cross sectional area of the position to a preselected magnitude thereby rendering pressure in each said branch pipe and each said intake ports of the cylinder equal. The orifice means can be constituted by a plate-shaped gasket having orifices to be located in the positions in each said branch pipes.
Inventors
- 👤 Toshiaki Konomi
- 👤 Joji Nurita
- 👤 Yasushi Tanazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:41
CPC Classifications
F; F02; F02M; F02M29/00; F02M29/04; F02M35/00; F02M35/10; F02M35/10006; F02M35/10078; F02M35/10242; F02M35/10262; F02M35/104; F02M35/1045; F02M35/112; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S261/00; Y10S261/55
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
An intake manifold for a multicylinder internal combustion engine of the type including a riser connected to a carburetor and branch pipes connecting the riser to intake ports of respective cylinders of the engine, the manifold being separable from the engine at an interface lying in a plane intersecting respective portions in each of the branch pipes, wherein the improvement comprises: a flat gasket inserted at said interface and having orifices located at said positions in said respective branch pipes for limiting the cross-sectional flow area at each of said positions to a preselected magnitude for equalizing the pressure drops across said orifices wherein each orifice is formed of a plurality of angularly spaced annular segmental openings surrounding an imperforate portion of the gasket centrally positioned in the respective branch pipe.
Claim 2
Dependent Claim
131 words
An intake manifold for a multicylinder internal combustion engine of the type including a riser connected to a carburetor and branch pipes connecting the riser to intake ports of respective cylinders of the engine, the manifold being separable from the engine at an interface lying in a plane intersecting respective portions in each of the branch pipes, wherein the improvement comprises: a flat gasket inserted at said interface and having orifices located at said positions in said respective branch pipes for limiting the cross-sectional flow area at each of said positions to a preselected magnitude for equalizing the pressure drops across said orifices wherein each orifice is formed of a plurality of angularly spaced annular segmental openings surrounding an imperforate portion of the gasket centrally positioned in the respective branch pipe.
Claim 3
Dependent Claim
26 words
An intake manifold in accordance with claim 1 wherein the angularly spaced annular segmental openings of each orifice are positioned concentrically in the respective branch pipe.
Claim 4
Dependent Claim
19 words
An intake manifold in accordance with claim 1 wherein the plurality of annular segmental openings consists of three openings.
References Cited (Backward Citations)
US1311071A
Cited
US1281899A
Cited
FR664130A
Cited
GB359062A
Cited
US1942227A
Cited
GB437020A
Cited
US3747581A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |