Patent US4254746A successfully refreshed from Google Patents.
US4254746A
Expired / Lapsed
US
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Means silencing suction noise in internal combustion engines
Assignee: Honda Motor Co Ltd
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Filing: 1978-05-30
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Granted: 1981-03-10
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Expires: 1998-05-30
Abstract
Abstract A device for silencing suction noises wherein a suction passage making a combustion chamber of an engine and an expansion chamber communicate with each other through a suction valve, is also provided with a fuel feeding device interposed in the passage. A suction pipe makes the expansion chamber communicate with the atmosphere, and has a substantially constant cross-sectional area over its entire length. The expansion chamber is predetermined to have a cross-sectional area larger than that of the suction passage and to have a substantial volume. The ratio of the suction pipe length to the suction passage length is selected to be in a range of 0.7 to 1.4.
Inventors
- 👤 Shoichi Chiba
- 👤 Kunio Konuma
- 👤 Hirofumi Ishizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:38
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/12; F02M35/1205; F02M35/1216; F02M35/1255; F02M35/1266
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
Apparatus for silencing suction noises of an internal combustion engine, comprising: at least one suction passage including a suction valve of said engine, a suction path conduit, and portions of a fuel feeding device for said engine; at least one suction pipe of substantially constant cross section having one end thereof communicating with the atmosphere; an expansion chamber interposed between and communicating with said suction passage and said suction pipe; said expansion chamber having a cross-sectional area larger than that of said suction passage, and a substantial volume; the ratio of the length l of said suction pipe to the length L of said suction passage is in a range of 0.7 to 1.4; a resonator provided above said suction passage so as to communicate with said passage; each combustion chamber of a multicylinder engine being made to communicate with said expansion chamber through an independent suction passage provided with a fuel feeding device; and each said independent suction passage being provided with its own said resonator.
Claim 2
Dependent Claim
167 words
Apparatus for silencing suction noises of an internal combustion engine, comprising: at least one suction passage including a suction valve of said engine, a suction path conduit, and portions of a fuel feeding device for said engine; at least one suction pipe of substantially constant cross section having one end thereof communicating with the atmosphere; an expansion chamber interposed between and communicating with said suction passage and said suction pipe; said expansion chamber having a cross-sectional area larger than that of said suction passage, and a substantial volume; the ratio of the length l of said suction pipe to the length L of said suction passage is in a range of 0.7 to 1.4; a resonator provided above said suction passage so as to communicate with said passage; each combustion chamber of a multicylinder engine being made to communicate with said expansion chamber through an independent suction passage provided with a fuel feeding device; and each said independent suction passage being provided with its own said resonator.
Claim 3
Dependent Claim
47 words
Apparatus according to claim 1, wherein: the length of said suction passage is l o ; the distance from said suction valve to the suction passage communicating part of said resonator is L r ; and said resonator is positioned such that L r /L o ≦0.4.
Claim 4
Dependent Claim
31 words
Apparatus according to claim 1, wherein: said resonator (710b) is provided on a connecting pipe (710a) disposed between said suction passage (710) and a carburetor (713) of said fuel feeding device.
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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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |