US4020805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 12:22
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
Cited
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 |