US4452195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating system for outboard motors
Assignee: Yamaha Marine Co Ltd
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Filing: 1983-04-08
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Granted: 1984-06-05
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Expires: 2003-04-08
Abstract
Abstract An improved lubricating system for a two-cycle internal combustion engine having a vertically disposed crankshaft. In accordance with an embodiment of the invention, the crankshaft has a connecting rod journal that rotates in a crank chamber above which is positioned a lubricant chamber. A lubricant delivery passage extends through the crankshaft from the lubricant chamber and terminates in a connecting rod journal portion formed in the crank chamber.
Inventors
- 👤 Kuniyoshi Matsumoto
- 👤 Katsuya Ishimatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:56
CPC Classifications
F; F02; F02B; F02B61/00; F02B61/04; F02B61/045; F01; F01M; F01M1/00; F01M1/02; F01M3/00; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1816; F02B75/007; F02B75/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
In a lubricating system for an internal combustion engine having a crankshaft supported for rotation about a generally vertically extending axis, a crankcase defining a crank chamber in which a first portion of said crankshaft rotates, and a connecting rod journal formed on said crankshaft first portion for journaling the big end of a connecting rod, the improvement comprising means defining a lubricant chamber sealed from and positioned above said crank chamber, said crankshaft having a second portion thereof extending into said lubricant chamber, a lubricant passage formed in said crankshaft and having an inlet opening in said second portion communicating with said lubricant chamber and a discharge opening formed in said connecting rod journal of said first portion for lubricating said connecting rod big end and means for delivering lubricant to said lubricant chamber.
Claim 2
Dependent Claim
135 words
In a lubricating system for an internal combustion engine having a crankshaft supported for rotation about a generally vertically extending axis, a crankcase defining a crank chamber in which a first portion of said crankshaft rotates, and a connecting rod journal formed on said crankshaft first portion for journaling the big end of a connecting rod, the improvement comprising means defining a lubricant chamber sealed from and positioned above said crank chamber, said crankshaft having a second portion thereof extending into said lubricant chamber, a lubricant passage formed in said crankshaft and having an inlet opening in said second portion communicating with said lubricant chamber and a discharge opening formed in said connecting rod journal of said first portion for lubricating said connecting rod big end and means for delivering lubricant to said lubricant chamber.
Claim 3
Dependent Claim
33 words
In a lubricating system as set forth in claim 1 wherein the engine has a plurality of cylinders each having a respective vertically disposed crank chamber in which a respective crankshaft portion rotates.
Claim 4
Dependent Claim
27 words
In a lubricating system as set forth in claim 2 wherein there is a lubricant chamber formed vertically above the respective of each of said crank chambers.
Claim 5
Dependent Claim
69 words
In a lubricating system as set forth in claim 3 wherein there are a plurality of crank chambers and connecting rod journals associated with each of the lubricant chambers and vertically disposed beneath the respective lubricant chamber, there being a lubricant passage formed in the crankshaft communicating at its inlet end with the respective lubricant chamber and having outlet openings in each of the respective crankshaft connecting rod journal.
Claim 6
Dependent Claim
27 words
In a lubricating system as set forth in claim 4 wherein the respective crankshaft connecting rod journal associated with each lubricant chamber is aligned with each other.
Claim 7
Dependent Claim
19 words
In a lubricating system as set forth in claim 5 wherein the respective crankshaft connecting rod journals are coaxial.
Claim 8
Dependent Claim
69 words
In a lubricating system as set forth in claim 2 wherein there are a plurality of crank chambers and connecting rod journals associated with each of the lubricant chambers and vertically disposed beneath the respective lubricant chamber, there being a lubricant passage formed in the crankshaft communicating at its inlet end with the respective lubricant chamber and having outlet openings in each of the respective crankshaft connecting rod journals.
Claim 9
Dependent Claim
27 words
In a lubricating system as set forth in claim 7 wherein the respective crankshaft connecting rod journal associated with each lubricant chamber is aligned with each other.
Claim 10
Dependent Claim
19 words
In a lubricating system as set forth in claim 8 wherein the respective crankshaft connecting rod journals are coaxial.
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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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |