US4770132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Draining system for outboard engine
Assignee: Yamaha Marine Co Ltd
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Filing: 1987-06-25
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Granted: 1988-09-13
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Expires: 2007-06-25
Abstract
Abstract An outboard motor powered by a two-cycle crankcase compression internal combustion engine. A system is incorporated for draining condensed fuel from a plurality of locations in the engine induction system through a common conduit to a combustion chamber for combustion.
Inventors
- 👤 Masafuni Sougawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:06
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/1015; F02M35/1019; F02B; F02B33/00; F02B33/02; F02B33/04; F02B61/00; F02B61/04; F02B61/045; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02M33/00; F02M33/02; F02M33/04; F02M35/10242; F02M35/10275; F02M35/10281; F02M35/104; F02M35/116; F02M35/16; F02M35/165; F02M35/167; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
91 words
A system for draining and burning condensed fuel in a two cycle crankcase compression internal combustion engine comprising a crankcase chamber containing a single crank throw, an induction passage for delivering a fuel air charge to said crankcase chamber, and means for delivering condensed fuel from said induction passage to a combustion chamber comprising a plurality of drain openings formed in said induction passage at locations where liquid fuel is likely to accumulate under various engine orientations and a common conduit interconnecting all of said drain openings with said combustion chamber.
Claim 2
Independent Claim
91 words
A system for draining and burning condensed fuel in a two cycle crankcase compression internal combustion engine comprising a crankcase chamber containing a single crank throw, an induction passage for delivering a fuel air charge to said crankcase chamber, and means for delivering condensed fuel from said induction passage to a combustion chamber comprising a plurality of drain openings formed in said induction passage at locations where liquid fuel is likely to accumulate under various engine orientations and a common conduit interconnecting all of said drain openings with said combustion chamber.
Claim 3
Dependent Claim
27 words
A system as set forth in claim 1 wherein the common conduit interconnects all of the drain openings with a combustion chamber served by the crankcase chamber.
Claim 4
Dependent Claim
27 words
A system as set forth in claim 2 wherein the common conduit opens into a transfer passage means that communicates the crankcase chamber with the combustion chamber.
Claim 5
Dependent Claim
30 words
A system as set forth in claim 3 further including check valve means in said conduit means for precluding reverse flow from said transfer passage means into said conduit means.
Claim 6
Dependent Claim
45 words
A system as set forth in claim 1 further including a reed type check valve in said induction system for precluding reverse flow through said induction system, at least some of said drain openings being positioned in proximity to said reed type check valve means.
Claim 7
Dependent Claim
78 words
A system as set forth in claim 1 wherein the engine is employed in connection with an outboard motor adapted to be steered about a vertically extending axis and trimmed and tilted about a horizontally extending axis and wherein the induction passage extends in a generally longitudinal direction relative to the outboard motor, some of said drain openings being longitudinally spaced along the induction passage and other of the drain passages being spaced vertically along the induction passage.
Claim 8
Dependent Claim
36 words
A system as set forth in claim 1 wherein the crankcase chamber is formed at the base of a cylinder bore containing a piston connected by means of a connecting rod to the single crank throw.
Claim 9
Dependent Claim
27 words
A system as set forth in claim 7 wherein the common conduit interconnects all of the drain openings with the combustion chamber formed by the cylinder bore.
Claim 10
Dependent Claim
31 words
A system as set forth in claim 8 further including a transfer passage communicating the combustion chamber with the crankcase and wherein the common conduit opens directly into said transfer passage.
Claim 11
Dependent Claim
49 words
A system as set forth in claim 1 wherein the engine is supported for movement about a first axis and wherein the drain openings are disposed at locations spaced from the axis and positioned to receive gravity flow of condensed fuel when the engine is moved about the axis.
Claim 12
Dependent Claim
16 words
A system as set forth in claim 10 wherein the axis is a vertically disposed axis.
Claim 13
Dependent Claim
16 words
A system as set forth in claim 10 wherein the axis is a horizontally disposed axis.
References Cited (Backward Citations)
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Cited
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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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |