US4475525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orifice of exhaust gas recirculation system
Assignee: Nissan Motor Co Ltd
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Filing: 1983-11-10
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Granted: 1984-10-09
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Expires: 2003-11-10
Abstract
Abstract In an exhaust gas recirculation system for an internal combustion engine, orifices disposed in a passage for recirculating the exhaust gas is made of a sheet of a bimetal or other material capable of changing from a normal shape to a deformed shape when the heat of the exhaust gas is applied, in order to prevent carbon contained in the exhaust gas from depositing on the orifices.
Inventors
- 👤 Yasuo Fukae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:20
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/11; F02M26/13; F02M26/17; F02M26/50; F02M2026/001; F02M2026/004; F02M26/21
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
An exhaust gas recirculation system for an internal combustion engine, comprising an exhaust gas recirculation passage extending from an exhaust passage of the engine to an intake passage of the engine for recirculating the exhaust gas of the engine, and an orifice disposed in said exhaust gas recirculation passage, said orifice being made of a material capable of changing its shape in accordance with temperature change.
Claim 2
Dependent Claim
66 words
An exhaust gas recirculation system for an internal combustion engine, comprising an exhaust gas recirculation passage extending from an exhaust passage of the engine to an intake passage of the engine for recirculating the exhaust gas of the engine, and an orifice disposed in said exhaust gas recirculation passage, said orifice being made of a material capable of changing its shape in accordance with temperature change.
Claim 3
Dependent Claim
20 words
An exhaust gas recirculation system according to claim 1, wherein said orifice is made of a sheet of a bimetal.
Claim 4
Dependent Claim
121 words
An exhaust gas recirculation system according to claim 2, wherein said system comprises a plurality of first orifices which are disposed in a partition wall separating said intake passage from said exhaust recirculation passage, each of said first orifices being made of a bimetal sheet, each of said first orifices having a spherical central portion one side of which is concave, the other side of which is convex, and which has an opening in the center, the bimetal of each first orifice consisting of a first metal which has a smaller coefficient of thermal expansion and is placed on the convex side and a second metal which has a greater coefficient of thermal expansion and is placed on the concave side.
Claim 5
Dependent Claim
57 words
An exhaust gas recirculation system according to claim 3, further comprising an exhaust gas recirculation valve which is disposed in said exhaust gas recirculation passage for controlling an exhaust gas flow therethrough, and a second orifice which is disposed upstream of said exhaust gas recirculation valve, said second orifice being made of a sheet of a bimetal.
Claim 6
Dependent Claim
27 words
An exhaust gas recirculation system according to claim 4, wherein said second orifice has a shape of a flat circular disc having an opening in the center.
References Cited (Backward Citations)
US4151715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |