Patent US5279267A successfully refreshed from Google Patents.
US5279267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intake passage arrangement for a two-cycle engine
Assignee: Yamaha Marine Co Ltd
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Filing: 1992-01-30
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Granted: 1994-01-18
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Expires: 2012-01-30
Abstract
Abstract An improved air intake passage arrangement for use on an internal combustion engine is disclosed wherein intake passages are integrated with the crankcase such that an outer wall of the crankcase defines an inner wall of the intake passages. This construction minimizes the size of the engine and promotes heating of the air flowing within the intake passages. In addition, depending upon the location of the fuel supply lines, the air intake structure of the present invention can enhance the vaporization of the fuel sprayed therein.
Inventors
- 👤 Masanori Takahashi
- 👤 Seiji Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:17
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/1015; F02M35/1019; F02B; F02B25/00; F02B25/26; F02B25/28; F02B61/00; F02B61/04; F02B61/045; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02M35/10091; F02M35/10118; F02M35/10242; F02M35/10255; F02M35/10268; F02M35/104; F02M35/116; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/1804; F02B2075/1824; F02M35/16; F02M35/165; F02M35/167
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
155 words
A reciprocating piston internal combustion engine comprising: a crankcase having inner and intermediate wall portions; a V-type cylinder body including two rows of combustion cylinders in communication with said crankcase, each of said combustion cylinders having an associated combustion air intake port; at least one intake opening positioned approximate a center line of the V-type cylinder body; first and second flow passages for supplying combustion air to a respective one of said two rows of combustion cylinders, each of said first and second flow passages including a curved portion and being defined, at least in part, by said intermediate wall portion of said crankcase; check valve means located within each of said first and second flow passages, each of said check valve means being located closer to its associated intake port than to said intake opening; and fuel supply means opening into each of said first and second flow passages at said curved portion thereof.
Claim 2
Dependent Claim
155 words
A reciprocating piston internal combustion engine comprising: a crankcase having inner and intermediate wall portions; a V-type cylinder body including two rows of combustion cylinders in communication with said crankcase, each of said combustion cylinders having an associated combustion air intake port; at least one intake opening positioned approximate a center line of the V-type cylinder body; first and second flow passages for supplying combustion air to a respective one of said two rows of combustion cylinders, each of said first and second flow passages including a curved portion and being defined, at least in part, by said intermediate wall portion of said crankcase; check valve means located within each of said first and second flow passages, each of said check valve means being located closer to its associated intake port than to said intake opening; and fuel supply means opening into each of said first and second flow passages at said curved portion thereof.
Claim 3
Dependent Claim
29 words
An internal combustion engine as claimed in claim 1, including a throttle body, said flow passages extending between said intermediate wall portion of said crankcase and said throttle body.
Claim 4
Dependent Claim
40 words
An internal combustion engine as claimed in claim 1, wherein at least a portion of each of said first and second flow passages comprises a duct through said crankcase, said intermediate wall comprising a wall of each of said ducts.
Claim 5
Dependent Claim
21 words
An internal combustion engine as claimed in claim 2, wherein said first and second flow passages include separate air inlet areas.
Claim 6
Dependent Claim
24 words
An internal combustion engine as claimed in claim 4, further including first and second throttle valves located within said separate air inlets areas respectively.
Claim 7
Dependent Claim
22 words
An internal combustion engine as claimed in claim 2, wherein said first and second flow passages include a common air inlet area.
Claim 8
Dependent Claim
21 words
An internal combustion engine as claimed in claim 6, further including a throttle valve located within said common air inlet area.
Claim 9
Dependent Claim
40 words
An internal combustion engine as claimed in claim 2, wherein each of said first and second flow passages comprises a continuous duct extending through said throttle body and through said crankcase, said intermediate wall comprising a wall of said ducts.
Claim 10
Dependent Claim
19 words
An internal combustion engine as claimed in claim 2, wherein said throttle body is secured directly against said crankcase.
Claim 11
Dependent Claim
37 words
An internal combustion engine as claimed in claim 9, wherein a section of said crankcase is connected, at various points, to said cylinder body and each of said check valve means is positioned at these connection points.
Claim 12
Dependent Claim
40 words
An internal combustion engine as claimed in claim 9, wherein each of said first and second flow passages comprises a continuous duct extending through said throttle body and through said crankcase, said intermediate wall comprising a wall of said ducts.
Claim 13
Dependent Claim
17 words
An internal combustion engine as claimed in claim 11, including means for supplying fuel to said ducts.
Claim 14
Dependent Claim
29 words
An internal combustion engine as claimed in claim 12, wherein said fuel supply means is arranged to supply fuel to a portion of the ducts extending through said crankcase.
References Cited (Backward Citations)
US2041708A
Cited
US3498053A
Cited
US4429668A
Cited
GB2142085A
Cited
US4947807A
Cited
US4920933A
Cited
US5020483A
Cited
US4993369A
Cited
US5143028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-17 | 1997-07-19 | 1998-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-17 | 2001-07-19 | 2002-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-17 | 2005-07-19 | 2006-01-18 | $7700.00 | Window Closed / Lapsed |