US4324208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine with a sound insulating casing
Assignee: Volkswagen AG
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Filing: 1980-05-21
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Granted: 1982-04-13
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Expires: 2000-05-21
Abstract
Abstract An internal combustion engine surrounded, at least in part, by a sound insulating casing. The casing is closed to the atmosphere with the exception of an inlet opening for receiving air for combustion in the engine. An air filter is coupled to the inlet opening for filtering the air passing through this opening into the interior of the casing.
Inventors
- 👤 Hermann Danckert
- 👤 Helmut Leptien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:44
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/11; F02B77/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
184 words
In an engine comprising: (a) an internal combustion engine having, (1) at least one intake pipe for receiving air for combustion that has passed through an air filter, (2) at least one fuel metering device, and (3) at least one exhaust pipe; and (b) a sound insulating casing with at least one air inlet opening, which encloses a space adjacent to said engine which includes the region of said intake pipe; the improvement wherein said casing is closed to the atmosphere with the exception of the said inlet opening, wherein an air filter is coupled to said inlet opening for filtering air passing through said inlet opening into the interior of said casing, wherein said intake pipe comprises an intake manifold within said casing, said manifold having a single air intake for supplying air to a plurality of cylinders, and wherein said inlet opening and the air intake of said intake manifold are arranged in such a manner that the air which flows between said inlet opening and said air intake passes over and cools parts of said engine which are to be cooled.
Claim 2
Dependent Claim
184 words
In an engine comprising: (a) an internal combustion engine having, (1) at least one intake pipe for receiving air for combustion that has passed through an air filter, (2) at least one fuel metering device, and (3) at least one exhaust pipe; and (b) a sound insulating casing with at least one air inlet opening, which encloses a space adjacent to said engine which includes the region of said intake pipe; the improvement wherein said casing is closed to the atmosphere with the exception of the said inlet opening, wherein an air filter is coupled to said inlet opening for filtering air passing through said inlet opening into the interior of said casing, wherein said intake pipe comprises an intake manifold within said casing, said manifold having a single air intake for supplying air to a plurality of cylinders, and wherein said inlet opening and the air intake of said intake manifold are arranged in such a manner that the air which flows between said inlet opening and said air intake passes over and cools parts of said engine which are to be cooled.
Claim 3
Dependent Claim
28 words
The improvement recited in claim 1, wherein said air filter coupled to said inlet opening is the only means for filtering the air which enters said intake pipe.
Claim 4
Dependent Claim
24 words
The improvement recited in claim 1, wherein at least one of said parts to be cooled is the fuel metering device of said engine.
Claim 5
Dependent Claim
41 words
The improvement recited in any one of claims 1, 2 or 3 wherein parts of said engine having large heat emission are disposed outside said space, surrounded by said casing, said space containing parts of the engine having low heat emission.
Claim 6
Dependent Claim
61 words
The improvement recited in claims 1, 2 or 3 wherein said casing encloses parts of said engine having large heat emission and further comprising an air lock dividing said interior space surrounded by said casing into a first space containing parts of the engine having low heat emission and a second space containing parts of said engine having large heat emission.
Claim 7
Dependent Claim
13 words
The improvement recited in claim 5, wherein said air lock is a diaphragm.
Claim 8
Dependent Claim
32 words
The improvements specified in claim 1 wherein said engine extends in a longitudinal direction and wherein said air inlet opening and said air intake are at opposite longitudinal ends of said engine.
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |