US4920933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
V-shaped two cycle engine for outboard
Assignee: Yamaha Marine Co Ltd
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Filing: 1988-04-19
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Granted: 1990-05-01
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Expires: 2008-04-19
Abstract
Abstract Two embodiments of V-type two cycle crankcase compression internal combustion engines wherein the charge supplied to the crankcase chambers by a primary induction system is supplemented by a secondary induction system that communicates with the crankcase chambers between the primary system and the respective cylinder bank.
Inventors
- 👤 Tomio Iwai
- 👤 Masanori Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:07
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/1015; F02M35/10183; F02B; F02B61/00; F02B61/04; F02B61/045; F02M13/00; F02M13/02; F02M35/1019; F02M35/10242; F02M35/10275; F02M35/104; F02M35/116; F02M35/16; F02M35/165; F02M35/167; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1824; F02B75/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
In a two cycle, crankcase compression internal combustion engine comprising first and second cylinder banks disposed at an angle to each other and defining a valley therebetween, a crankcase chamber, and primary means for admitting a fuel air charge to said crankcase chamber at a first location, the improvement comprising secondary means for admitting a supplemental fuel air charge to said crankcase chamber, said secondary means being located in an area spaced from said primary means.
Claim 2
Dependent Claim
76 words
In a two cycle, crankcase compression internal combustion engine comprising first and second cylinder banks disposed at an angle to each other and defining a valley therebetween, a crankcase chamber, and primary means for admitting a fuel air charge to said crankcase chamber at a first location, the improvement comprising secondary means for admitting a supplemental fuel air charge to said crankcase chamber, said secondary means being located in an area spaced from said primary means.
Claim 3
Dependent Claim
40 words
In a two cycle, crankcase compression internal combustion engine as set forth in claim 1 wherein the secondary means delivers a fuel air charge to the crankcase chambers at a point closer to the cylinder bank than the primary means.
Claim 4
Dependent Claim
28 words
In a two cycle, crankcase compression internal combustion engine as set forth in claim 1 wherein the primary means comprises a pair of horizontally disposed two barrel carburetors.
Claim 5
Dependent Claim
25 words
In a two cycle, crankcase compression internal combustion engine as set forth in claim 3 wherein the secondary means comprises a pair of separate carburetors.
Claim 6
Dependent Claim
25 words
In a two cycle, crankcase compression internal combustion engine as set forth in claim 1 wherein the primary means comprises a pair of primary carburetors.
Claim 7
Dependent Claim
25 words
In a two cycle, crankcase compression internal combustion engine as set forth in claim 5 wherein the secondary means comprises a pair of separate carburetors.
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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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |