US5513608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two cycle engine lubricating system
Assignee: Yamaha Marine Co Ltd
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Filing: 1993-08-26
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Granted: 1996-05-07
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Expires: 2013-08-26
Abstract
Abstract A lubricating system for a reciprocating machine such as a two cycle internal combustion engine having the cylinder bores horizontally disposed. A drain system is provided for draining lubricant from the lowermost crankcase chambers to the upper cylinders so as to maintain uniformity of lubrication and insure even and smooth running. A check valve is provided for precluding reverse flow and the lubricant is delivered both to the crankcase chambers and to the piston through either the piston and/or cylinder liner. The lubricant supplied to the piston is supplied at its upper area so as to insure complete lubrication of its circumference and of the associated cylinder bore.
Inventors
- 👤 Kazutoshi Takashima
- 👤 Tomohiro Kanamaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:44
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/02; F01M3/00; F01M1/10; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B61/00; F02B61/04; F02B61/045; F02B75/16; F02B75/18; F02B75/22; F02F; F02F2200/00; F02F2200/06
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
82 words
A lubricating system for an internal combustion engine having at least two horizontally disposed cylinders, one disposed vertically above the other, each of said cylinders having a respective lubricated portion one disposed vertically above the other, means for delivering lubricant to said lubricated portions, means for draining lubricant from a lower area of the lower of said lubricated portions, and means for delivering the drained lubricant only to an upper area of the upper lubricated portion including a single uninterrupted flow conduit.
Claim 2
Dependent Claim
82 words
A lubricating system for an internal combustion engine having at least two horizontally disposed cylinders, one disposed vertically above the other, each of said cylinders having a respective lubricated portion one disposed vertically above the other, means for delivering lubricant to said lubricated portions, means for draining lubricant from a lower area of the lower of said lubricated portions, and means for delivering the drained lubricant only to an upper area of the upper lubricated portion including a single uninterrupted flow conduit.
Claim 3
Dependent Claim
32 words
A lubricating system as set forth in claim 1 wherein the means for delivering the drained lubricant includes a conduit with check valve means therein for permitting flow only in one direction.
Claim 4
Dependent Claim
27 words
A lubricating system as set forth in claim 2 wherein the operation of the engine causes the pressure in one of the lubricated portions to vary cyclically.
Claim 5
Dependent Claim
35 words
A lubricating system as set forth in claim 3 wherein the check valve means permits flow only to the upper lubricated portion and precludes flow from the upper lubricated portion to the lower lubricated portion.
Claim 6
Dependent Claim
20 words
A lubricating system as set forth in claim 4 wherein the lubricated portions each comprise a piston and cylinder bore.
Claim 7
Dependent Claim
29 words
A lubricating system as set forth in claim 5 wherein the pressure in both lubricated portions varies cyclically but the cyclic variations are out of phase with each other.
Claim 8
Dependent Claim
41 words
A lubricating system as set forth in claim 1 wherein there are more than two cylinders and each cylinder below the top cylinder has its lubricated portion drained and the drained lubricant is delivered only to cylinders above the drained cylinder.
Claim 9
Dependent Claim
47 words
A lubricating system as set forth in claim 7 wherein each of the cylinders have crankcase chambers that are sealed from each other but are vertically positioned relative to each other so that leakage from one crankcase chamber will flow by gravity to the lower crankcase chambers.
Claim 10
Dependent Claim
19 words
A lubricating system as set forth in claim 8 wherein the engine is a two cycle crankcase compression engine.
Claim 11
Dependent Claim
26 words
A lubricating system as set forth in claim 9 wherein the lubricant drained from the lower cylinder is delivered to multiple locations in the upper cylinder.
Claim 12
Dependent Claim
32 words
A lubricating system as set forth in claim 10 wherein the means for delivering the drained lubricant includes a conduit with check valve means therein for permitting flow only in one direction.
Claim 13
Dependent Claim
27 words
A lubricating system as set forth in claim 11 wherein the operation of the engine causes the pressure in one of the lubricated portions to vary cyclically.
Claim 14
Dependent Claim
34 words
A lubricating system as set forth in claim 12 wherein the check valve means permits flow only to the upper lubricated portion and precludes from the upper lubricated portion to the lower lubricated portion.
Claim 15
Dependent Claim
21 words
A lubricating system as set forth in claim 8 wherein lubricant is delivered to an upper area of the cylinder bores.
Claim 16
Dependent Claim
25 words
A lubricating system as set forth in claim 14 wherein the lubricant is delivered to the cylinder bores through a passage formed in the cylinder.
Claim 17
Dependent Claim
23 words
A lubricating system as set forth in claim 14 wherein the lubricant is delivered to the cylinder bores through passages in the pistons.
Claim 18
Dependent Claim
20 words
A lubricating system as set forth in claim 16 wherein the passages are formed in the heads of the pistons.
Claim 19
Dependent Claim
33 words
A lubricating system as set forth in claim 17 further including check valve means in the passages for permitting flow only from the interior of the pistons to the heads of the pistons.
Claim 20
Dependent Claim
19 words
A lubricating system as set forth in claim 16 wherein the passages extends through the skirt of the pistons.
Claim 21
Dependent Claim
33 words
A lubricating system as set forth in claim 19 further including check valve means in the passages for permitting flow only from the interior of the pistons to the exterior of the pistons.
Claim 22
Dependent Claim
26 words
A lubricating system as set forth in claim 19 wherein the passages extends between a pair of ring grooves formed in the skirts of the pistons.
Claim 23
Dependent Claim
33 words
A lubricating system as set forth in claim 21 further including check valve means in the passages for permitting flow only from the interior of the pistons to the exterior of the pistons.
Claim 24
Dependent Claim
113 words
A lubricating system as set forth in claim 1, wherein each cylinder defines a horizontally extending cylinder bore, and further including a piston reciprocating in each cylinder bore and sweeping a portion of the length of the respective cylinder bore, a circumferential groove formed in a surface of each cylinder spaced radially outwardly of its respective cylinder bore and along the upper side of said cylinder bore, the means for delivering lubricant comprising at least one passage extending through said cylinder from said circumferential groove at a point above the lower periphery of said cylinder bore and adjacent the uppermost surface of said piston and means for introducing lubricant to said circumferential groove.
Claim 25
Dependent Claim
72 words
A two cycle internal combustion engine having a cylinder defining a cylinder bore, a piston reciprocating in said cylinder bore and sweeping a portion of the length of said cylinder bore, a passage extending through said piston for introducing lubricant into the swept area of said cylinder bore, and check valve means in said passage for permitting flow only from the interior of the piston to the exterior surface of said piston.
Claim 26
Dependent Claim
72 words
A two cycle internal combustion engine having a cylinder defining a cylinder bore, a piston reciprocating in said cylinder bore and sweeping a portion of the length of said cylinder bore, a passage extending through said piston for introducing lubricant into the swept area of said cylinder bore, and check valve means in said passage for permitting flow only from the interior of the piston to the exterior surface of said piston.
Claim 27
Dependent Claim
23 words
A two cycle internal combustion engine as set forth in claim 24 wherein the passage is formed in the head of the piston.
Claim 28
Dependent Claim
22 words
A two cycle internal combustion engine as set forth in claim 24 wherein the passage extends through the skirt of the piston.
Claim 29
Dependent Claim
29 words
A two cycle internal combustion engine as set forth in claim 26 wherein the passage extends between a pair of ring grooves formed in the skirt of the piston.
Claim 30
Dependent Claim
28 words
A two cycle internal combustion engine as set forth in claim 24 wherein the lubricant introduced to the cylinder bore is drained from another portion of the engine.
Claim 31
Dependent Claim
31 words
A two cycle internal combustion engine as set forth in claim 28 wherein the other portion is positioned vertically beneath the point where the lubricant is introduced to the cylinder bore.
Claim 32
Dependent Claim
23 words
A two cycle internal combustion engine as set forth in claim 29 wherein the lubricant is drained from another piston cylinder bore assembly.
Claim 33
Dependent Claim
35 words
A two cycle internal combustion engine as set forth in claim 30 wherein the other cylinder piston assembly has a crankcase and the lubricant is drained from the crankcase of the other piston cylinder assembly.
Claim 34
Dependent Claim
24 words
A two cycle internal combustion engine as set forth in claim 24 further including pumping means for pumping the lubricant to the cylinder bore.
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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) | 1999-05-07 | 1999-11-06 | 2000-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-07 | 2003-11-06 | 2004-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-07 | 2007-11-06 | 2008-05-07 | $7700.00 | Window Closed / Lapsed |