US4192403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler for internal combustion engines
Assignee: Honda Motor Co Ltd
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Filing: 1978-05-23
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Granted: 1980-03-11
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Expires: 1998-05-23
Abstract
Abstract A muffler for internal combustion engines having the interior of an expansion chamber sectioned by a porous plate through which an exhaust inlet pipe is extended. The inlet pipe is closed at its down-stream end and is provided with many perforations in that part of the inlet pipe positioned in the expansion chamber. Such perforations permit the inlet pipe to communicate with the interior of the expansion chamber in the muffler.
Inventors
- 👤 Takashi Nakagawa
- 👤 Tadashi Sugiuchi
- 👤 Kanau Iwashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:53
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/089
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
A muffler for an internal combustion engine, comprising: a muffler body; a porous plate disposed within said muffler body and sectioning the interior of said muffler body into front and rear expansion chambers; an exhaust inlet pipe extending into said front expansion chamber through a front wall of said body, said exhaust inlet pipe extending through said front expansion chamber, through said porous plate, and into said rear expansion chamber; said exhaust inlet pipe being closed at the downstream end thereof, said closed downstream end being disposed within said rear expansion chamber; said exhaust inlet pipe being provided with a plurality of perforations in the portion thereof disposed in said front expansion chamber, such that the interior of said exhaust inlet pipe directly communicates with said front expansion chamber; said exhaust inlet pipe being provided with a plurality of perforations in the portion thereof disposed in said rear expansion chamber, such that the interior of said exhaust inlet pipe directly communicates with said rear expansion chamber; and said rear expansion chamber being directly connected with the downstream side of an exhaust system through an exhaust outlet pipe.
Claim 2
Dependent Claim
187 words
A muffler for an internal combustion engine, comprising: a muffler body; a porous plate disposed within said muffler body and sectioning the interior of said muffler body into front and rear expansion chambers; an exhaust inlet pipe extending into said front expansion chamber through a front wall of said body, said exhaust inlet pipe extending through said front expansion chamber, through said porous plate, and into said rear expansion chamber; said exhaust inlet pipe being closed at the downstream end thereof, said closed downstream end being disposed within said rear expansion chamber; said exhaust inlet pipe being provided with a plurality of perforations in the portion thereof disposed in said front expansion chamber, such that the interior of said exhaust inlet pipe directly communicates with said front expansion chamber; said exhaust inlet pipe being provided with a plurality of perforations in the portion thereof disposed in said rear expansion chamber, such that the interior of said exhaust inlet pipe directly communicates with said rear expansion chamber; and said rear expansion chamber being directly connected with the downstream side of an exhaust system through an exhaust outlet pipe.
Claim 3
Dependent Claim
42 words
A muffler according to claim 1, wherein: said porous plate is disposed in a central portion in the lengthwise direction of said muffler body; and said front and rear expansion chambers together define substantially the entire interior volume of said muffler body.
Claim 4
Dependent Claim
15 words
A muffler according to claim 1 or 2, wherein: said porous plate is substantially flat.
Claim 5
Dependent Claim
19 words
A muffler according to claim 1 or 2, wherein: said porous plate is curved to have a curved surface.
Claim 6
Dependent Claim
61 words
A muffler according to claim 3, wherein: said flat porous plate includes a substantially centrally disposed aperture for receiving therethrough said exhaust inlet pipe; said porous plate further includes a plurality of perforations disposed substantially around said centrally disposed aperture; and said plurality of perforations in said porous plate permit direct communication of gases between said front and rear expansion chambers.
References Cited (Backward Citations)
FR527934A
Cited
US2083840A
Cited
US2784797A
Cited
US2838128A
Cited
US3987868A
Cited
US4011922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |