US3965873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow equalizing means
Assignee: Toyota Motor Corp
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Filing: 1973-11-01
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Granted: 1976-06-29
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Expires: 1993-11-01
Abstract
Abstract An intake manifold for a multicyclinder 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
- 👤 Tsohiaki Konomi
- 👤 Joji Nurita
- 👤 Yasushi Tanazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:35
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10078; F02M35/104; F02M35/1045; F02M35/112
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
137 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 defined by an arc of a circle approximately concentric with, and of equal diameter to, the respective branch pipe, and a horizontal chord joining the upper ends of said arc.
Claim 2
Dependent Claim
137 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 defined by an arc of a circle approximately concentric with, and of equal diameter to, the respective branch pipe, and a horizontal chord joining the upper ends of said arc.
Claim 3
Dependent Claim
40 words
An intake manifold as set forth in claim 1 wherein the length of arc of each orifice is separately predetermined to equalize the distribution of fuel-air mixture to each branch pipe by adjusting the opening areas of the corresponding orifices.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |