Patent US4903656A successfully refreshed from Google Patents.
US4903656A
Expired / Lapsed
US
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Gas engine
Assignee: Yanmar Co Ltd
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Filing: 1988-12-29
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Granted: 1990-02-27
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Expires: 2008-12-29
Abstract
Abstract A gas engine of a pre-chamber type in which a pre-chamber is arranged in communication to a main combustion chamber, an intake passage is arranged to supply lean mixture to the main chamber, a gas pipe is provided to form rich mixture by fuel gas in the pre-chamber, and a spark plug adapted to ignite the rich mixture in the pre-chamber prior to the combustion of lean mixture in the main combustion chamber, is characterized in that an area of a section of the pre-chamber gradually decreases toward the main combustion chamber.
Inventors
- 👤 Touru Nakazono
- 👤 Yoshihiro Natsume
- 👤 Takashi Furuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:58
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/34; F02D41/345; F02B; F02B19/00; F02B19/10; F02B19/1004; F02B19/1014; F02B19/1019; F02B19/1023; F02B19/1028; F02B19/1033; F02D19/00; F02D19/02; F02D19/021; F02D19/023; F02D19/024; F02M; F02M21/00; F02M21/02; F02M21/0218; F02M21/0248; F02M21/0251; F02M21/0275; F02B1/00; F02B1/02; F02B1/04; F02M21/023; F02M21/0239; F02M21/0257; F02M21/026; F02M21/0269; F02P; F02P13/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/30; Y02T10/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A gas engine of a pre-chamber type in which a pre-chamber is arranged in communication to a main combustion chamber, an intake passage is arranged to supply lean mixture to the main chamber, a gas pipe is provided to form rich mixture by fuel gas in the pre-chamber, and a spark plug adapted to ignite the rich mixture in the pre-chamber prior to the combustion of lean mixture in the main combustion chamber, characterized in that an area of a section of the pre-chamber gradually decreases toward the main combustion chamber.
Claim 2
Dependent Claim
91 words
A gas engine of a pre-chamber type in which a pre-chamber is arranged in communication to a main combustion chamber, an intake passage is arranged to supply lean mixture to the main chamber, a gas pipe is provided to form rich mixture by fuel gas in the pre-chamber, and a spark plug adapted to ignite the rich mixture in the pre-chamber prior to the combustion of lean mixture in the main combustion chamber, characterized in that an area of a section of the pre-chamber gradually decreases toward the main combustion chamber.
Claim 3
Dependent Claim
43 words
A gas engine of claim 1 wherein d/D is approximately 0.3 and L/D is set in a range between 1.5 and 2.0, in which L is a length of the pre-chamber, D and d are maximum and minimum diameters of the pre-chamber, respectively.
Claim 4
Dependent Claim
37 words
A gas engine of claim 1 wherein the pre-chamber has a cylindrical inner surface of a predetermined length at an end portion remote from the main combustion chamber, and a tapered surface continuing to this cylindrical surface.
Claim 5
Dependent Claim
26 words
A gas engine of claim 1 wherein an inner surface of the pre-chamber is entirely formed by a tapered surface converging toward the main combustion chamber.
Claim 6
Dependent Claim
18 words
A gas engine of claim wherein the main combustion chamber has a diameter of 100 mm or more.
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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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |