US4467774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for recirculating the exhaust gas of an internal combustion engine
Assignee: Robert Bosch GmbH
•
Filing: 1983-09-14
•
Granted: 1984-08-28
•
Expires: 2003-09-14
Abstract
Abstract For recirculating the exhaust gas of an internal combustion engine, a recirculation line is provided which leads from the exhaust side to the intake side of the engine. A valve for controlling the recirculation rate is disposed in the line, and in order to prevent the formation of condensates in the line on the exhaust side when the valve is closed, a flushing line is provided which leads from the line segment on the exhaust side to a location point having lower pressure as compared with the exhaust side.
Inventors
- 👤 Wolfram Becker
- 👤 Hermann Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:16
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/13; F02M26/42; F02M26/44; F02M26/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
An apparatus for recirculating the exhaust gas of an internal combustion engine having a line segment leading from the exhaust side to the intake side of the engine in which a valve for controlling the recirculation rate is disposed, the improvement comprising a flushing line connecting a pair of said line segment leading from the exhaust gas side to said valve, to a location point having lower pressure than the pressure in said exhaust side.
Claim 2
Independent Claim
75 words
An apparatus for recirculating the exhaust gas of an internal combustion engine having a line segment leading from the exhaust side to the intake side of the engine in which a valve for controlling the recirculation rate is disposed, the improvement comprising a flushing line connecting a pair of said line segment leading from the exhaust gas side to said valve, to a location point having lower pressure than the pressure in said exhaust side.
Claim 3
Dependent Claim
26 words
An apparatus as defined by claim 1, wherein said location point comprises connecting tube disposed between a pre-muffler and a post-muffler in an exhaust gas line.
Claim 4
Dependent Claim
21 words
An apparatus as defined by claim 2, wherein said connecting tube is embodied as a Venturi tube at said location point.
References Cited (Backward Citations)
US1635938A
Cited
US3782348A
Cited
US3799133A
Cited
US4333440A
Cited
US4418532A
Cited
US4399798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |