US4766859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating system for vertical shaft engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1987-07-24
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Granted: 1988-08-30
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Expires: 2007-07-24
Abstract
Abstract A vertical shaft internal combustion engine particularly adapted for powering a rotary type lawn mower. The engine is provided with a baffled crankcase so as to minimize the adverse effects of oil "sloshing" within the crankcase while, at the same time, permitting flow between the baffles. In addition, an oil slinger arrangement is incorporated that is also baffled so as to reduce frothing in the crankcase to reduce aeration of the oil in the crankcase and also to direct the oil flow from the slinger.
Inventors
- 👤 Mutsuaki Miyaki
- 👤 Yoshimi Tachibana
- 👤 Kiyohiko Oguri
- 👤 Yoshiharu Isaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:40
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/007; F01; F01M; F01M11/00; F01M9/00; F01M9/06; F02B63/00; F02B63/02; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/34
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
93 words
In a lubrication system for an internal combustion engine having an output shaft rotatable about a generally vertically extending axis, a lubricant reservoir defined at least in part by a lower wall of said engine surrounding said output shaft and through which said output shaft passes for driving a driven element, said lower wall being formed with an upwardly extending baffle for dividing said lubricant reservoir into separate sections and for reducing sloshing of lubricant within said lubricant reservoir, and oil passage means extending through said baffle for permitting lubricant to flow therethrough.
Claim 2
Dependent Claim
93 words
In a lubrication system for an internal combustion engine having an output shaft rotatable about a generally vertically extending axis, a lubricant reservoir defined at least in part by a lower wall of said engine surrounding said output shaft and through which said output shaft passes for driving a driven element, said lower wall being formed with an upwardly extending baffle for dividing said lubricant reservoir into separate sections and for reducing sloshing of lubricant within said lubricant reservoir, and oil passage means extending through said baffle for permitting lubricant to flow therethrough.
Claim 3
Dependent Claim
30 words
In a lubrication system for an internal combustion engine as set forth in claim 1 wherein the baffle is integrally formed with a bearing rotatably journaling the engine output shaft.
Claim 4
Dependent Claim
36 words
In a lubrication system for an internal combustion engine as set forth in claim 2 wherein the lower wall is formed with a pair of generally parallel baffles each integrally connected to the output shaft bearing.
Claim 5
Dependent Claim
35 words
In a lubrication system for an internal combustion engine as set forth in claim 3 wherein the oil passage means comprise circumferential recesses formed in a lower face of the lower wall adjacent the baffles.
Claim 6
Dependent Claim
23 words
In a lubrication system for an internal combustion engine as set forth in claim 1 wherein the baffle extends transversely across the reservoir.
Claim 7
Dependent Claim
25 words
In a lubrication system for an internal combustion engine as set forth in claim 5 wherein the baffle is formed integrally with the lower wall.
Claim 8
Dependent Claim
36 words
In a lubrication system for an internal combustion engine as set forth in claim 6 wherein the lower wall is formed with a pair of generally parallel baffles each integrally connected to the output shaft bearing.
Claim 9
Dependent Claim
35 words
In a lubrication system for an internal combustion engine as set forth in claim 7 wherein the oil passage means comprise circumferential recesses formed in a lower face of the lower wall adjacent the baffles.
Claim 10
Dependent Claim
34 words
In a lubrication system for an internal combustion engine as set forth in claim 8 wherein the baffles are integrally connected to a bearing formed by the lower wall and journalling the output shaft.
Claim 11
Dependent Claim
32 words
In a lubrication system for an internal combustion engine as set forth in claim 1 further including an oil slinger driven by the engine output shaft and immersed in the oil reservoir.
Claim 12
Dependent Claim
44 words
In a lubrication system for an internal combustion engine as set forth in claim 10 wherein the oil slinger rotates about an axis that is inclined to the horizontal and wherein the lower wall is formed with a further baffle adjacent the oil slinger.
Claim 13
Dependent Claim
50 words
In a lubrication system for an internal combustion engine as set forth in claim 11 further including a camshaft driven by the engine output shaft by means of a pair of timing gears, the oil slinger having a gear engaged with the camshaft timing gear for driving the oil slinger.
Claim 14
Dependent Claim
37 words
In a lubrication system for an internal combustion engine as set forth in claim 10 further including a baffle plate extending around a portion of the circumference of the oil slinger for directing the oil thrown thereby.
Claim 15
Dependent Claim
44 words
In a lubrication system for an internal combustion engine as set forth in claim 13 wherein the oil slinger rotates about an axis that is inclined to the horizontal and wherein the lower wall is formed with a further baffle adjacent the oil slinger.
Claim 16
Dependent Claim
50 words
In a lubrication system for an internal combustion engine as set forth in claim 14 further including a camshaft driven by the engine output shaft by means of a pair of timing gears, the oil slinger having a gear engaged with the camshaft timing gear for driving the oil slinger.
Claim 17
Dependent Claim
112 words
In a lubrication system for an internal combustion engine having a generally horizontaly disposed cylinder extending from a crankcase, a crankshaft journaled for rotation within said crankcase about a generally vertically extending axis, an oil slinger rotatable about an axis disposed at an angle to both the horizontal and the vertical and at least in part submerged in the lubricant in said crankcase, means for driving said oil slinger from said camshaft, said oil slinger axis being disposed for directing lubricant thrown by said slinger toward the upper end of said camshaft and a baffle contained within said crankcase and juxtaposed to said slinger for confining the oil movement within the crankcase.
Claim 18
Dependent Claim
112 words
In a lubrication system for an internal combustion engine having a generally horizontaly disposed cylinder extending from a crankcase, a crankshaft journaled for rotation within said crankcase about a generally vertically extending axis, an oil slinger rotatable about an axis disposed at an angle to both the horizontal and the vertical and at least in part submerged in the lubricant in said crankcase, means for driving said oil slinger from said camshaft, said oil slinger axis being disposed for directing lubricant thrown by said slinger toward the upper end of said camshaft and a baffle contained within said crankcase and juxtaposed to said slinger for confining the oil movement within the crankcase.
Claim 19
Dependent Claim
30 words
In a lubrication system for an internal combustion engine as set forth in claim 16 wherein the baffle extends generally perpendicularly to the axis of rotation of the oil slinger.
Claim 20
Dependent Claim
24 words
In a lubrication system for an internal combustion engine as set forth in claim 17 wherein the baffle is formed integrally with the crankcase.
Claim 21
Dependent Claim
39 words
In a lubrication system for an internal combustion engine as set forth in claim 18 further including a circumferential baffle fixed within the crankcase extending partially around the circumference of the oil slinger for directing the oil thrown thereby.
Claim 22
Dependent Claim
39 words
In a lubrication system for an internal combustion engine as set forth in claim 16 further including a circumferential baffle fixed within the crankcase extending partially around the circumference of the oil slinger for directing the oil thrown thereby.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |