Patent US4909204A successfully refreshed from Google Patents.
US4909204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction of two-cycle engine lubricating system
Assignee: Honda Motor Co Ltd
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Filing: 1989-01-18
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Granted: 1990-03-20
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Expires: 2009-01-18
Abstract
Abstract In a two-cycle engine lubrication system in which a crankshaft is supported on a pair of bearings in a crankcase, the crankshaft being sealed with seals mounted outwardly of the bearings and lubricating holes being provided along transfer passages which connect the crankcase with a combustion chamber and extending into the crankshaft bore between the bearings and the seals. The lubricating holes open into the crankshaft bore close to the bearing and one or more lubricant guide grooves extend outwardly in the crankshaft bore from the lubricating holes to a seal.
Inventors
- 👤 Yutaka Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:40
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/02; F01M1/00; F01M1/06; F02; F02B; F02B75/00; F02B75/16; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
55 words
A two-cycle engine comprising a cylinder; a crankcase; a transfer passage extending between said crankcase and said cylinder; a crankshaft bore in said crankcase; a crankshaft in said bore; a lubricating hole extending between said transfer passage and said bore; a groove in said bore extending laterally and toward said crankshaft from said lubricating hole.
Claim 2
Dependent Claim
55 words
A two-cycle engine comprising a cylinder; a crankcase; a transfer passage extending between said crankcase and said cylinder; a crankshaft bore in said crankcase; a crankshaft in said bore; a lubricating hole extending between said transfer passage and said bore; a groove in said bore extending laterally and toward said crankshaft from said lubricating hole.
Claim 3
Dependent Claim
13 words
The two-cycle engine of claim 1 further comprising a plurality of said grooves.
Claim 4
Dependent Claim
15 words
The two-cycle engine of claim 2 wherein said grooves are mutually adjacent and substantially coextensive.
Claim 5
Dependent Claim
64 words
The two-cycle engine of claim 1 further comprising two bearings to either side of said cylinder in said crankcase rotatably mounting on said crankshaft in said bore; and seals positioned outwardly and displaced from said bearings on said crankshaft, said lubricating hole extending to adjacent one said bearing in said bore, said groove extending from said lubricating hole to adjacent one of said seals.
Claim 6
Dependent Claim
24 words
The two-cycle engine of claim 4 further comprising a gear on said crankshaft between said bearing and said seal between which said groove extends.
Claim 7
Dependent Claim
14 words
The two-cycle engine of claim 1 wherein said groove opens downwardly along its length.
Claim 8
Dependent Claim
59 words
A lubricating system for a two-cycle engine having a cylinder, a crankcase, a transfer passage extending between said crankcase and said cylinder, a crankshaft bore in said crankcase, and a crankshaft in said bore, comprising a lubricating hole extending between said transfer passage and said bore; a groove extending in said bore laterally and downwardly from said lubricating hole.
Claim 9
Dependent Claim
59 words
A lubricating system for a two-cycle engine having a cylinder, a crankcase, a transfer passage extending between said crankcase and said cylinder, a crankshaft bore in said crankcase, and a crankshaft in said bore, comprising a lubricating hole extending between said transfer passage and said bore; a groove extending in said bore laterally and downwardly from said lubricating hole.
Claim 10
Dependent Claim
13 words
The lubricating system of claim 7 further comprising a plurality of said grooves.
Claim 11
Dependent Claim
15 words
The lubricating system of claim 8 wherein said grooves are mutually adjacent and substantially coextensive.
Claim 12
Dependent Claim
53 words
The lubricating system of claim 7 wherein the engine includes bearings rotatably mounting the crankshaft in the crankshaft bore and seals in the bore about the crankshaft outwardly of the bearings, said lubricating hole being adjacent one of the bearings and said groove extending from said lubricating hole to one of the seals.
Claim 13
Dependent Claim
41 words
The lubricating system of claim 10 wherein the engine further includes a gear on the crankshaft between one of the bearings and one of the seals, said groove spanning the gear from said lubricating hole adjacent the bearing to the seal.
Claim 14
Dependent Claim
15 words
The lubricating system of claim 7 wherein said groove is open downwardly along its length.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |