Patent US4974554A successfully refreshed from Google Patents.
US4974554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound rod, sleeve and offset crankshaft assembly
Assignee: Individual
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Filing: 1989-08-17
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Granted: 1990-12-04
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Expires: 2009-08-17
Abstract
Abstract A compound rod, sleeve and an offset crankshaft assembly for post crankshaft top dead center-top dead center piston assembly is invented for an internal combustion engine and other machines. The piston includes a crown or head and a skirt and is connected to a first connecting rod by a second connecting rod. A separate sleeve is provided and attached to the linkage by the first connecting rod. The piston and the sleeve are kinematically linked to each other and to the crankshaft of the engine by the two connecting rods, so that the piston crown or head is raised to a maximum elevation after the top dead center of the crankshaft rod journal which occurs during the compression stroke and exhaust stroke of the piston. The second connecting rod is connected to the crankshaft of the engine by the first connecting rod. The purpose of this invention is to greatly increase the mechanical and input/output efficiencies of an engine (internal or external combustion) by providing for an increased effective moment arm offered by the crankshaft rod journal during the period of peak combustion pressure.
Inventors
- 👤 Lloyd H. Emery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:00
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0002; F02F7/0019; F02B; F02B41/00; F02B41/02; F02B41/04; F16; F16H; F16H21/00; F16H21/10; F16H21/16; F16H21/18; F16H21/22; F16H21/32; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
An offset crankshaft assembly comprising: (a) an internal combustion engine block with at least one cylinder in said block and a cylinder head, (b) an offset crankshaft located in the block in which the crankshaft main bearings are located in an offset position relative to the cylinder bore centerline, (c) a first connecting rod, pivotally connected to a sleeve intermediate the length of the first connecting rod, which connects a rod journal of the offset crankshaft to a bottom end of a second connecting rod, (d) said sleeve connected to the first connecting rod by a bearing means, (e) said second connecting rod connects a piston to the first connecting rod, said second connecting rod being connected to said first connecting rod using bearing means, (f) said piston connected to the second connecting rod by a bearing means.
Claim 2
Dependent Claim
138 words
An offset crankshaft assembly comprising: (a) an internal combustion engine block with at least one cylinder in said block and a cylinder head, (b) an offset crankshaft located in the block in which the crankshaft main bearings are located in an offset position relative to the cylinder bore centerline, (c) a first connecting rod, pivotally connected to a sleeve intermediate the length of the first connecting rod, which connects a rod journal of the offset crankshaft to a bottom end of a second connecting rod, (d) said sleeve connected to the first connecting rod by a bearing means, (e) said second connecting rod connects a piston to the first connecting rod, said second connecting rod being connected to said first connecting rod using bearing means, (f) said piston connected to the second connecting rod by a bearing means.
Claim 3
Dependent Claim
51 words
The offset crankshaft assembly of claim 1 wherein the piston is kinematically linked to the offset crankshaft via said two connecting rods in series, such that, the piston crown is raised to a maximum elevation in the cylinder bore (top dead center) after top dead center of the crankshaft rod journal.
Claim 4
Dependent Claim
92 words
The offset crankshaft assembly of claim 1, wherein a ratio of, distances connecting pivot points of the offset crankshaft linkage are in such a relationship that the piston crown has an upward motion, acceleration and velocity toward the cylinder head as the crankshaft rod journal has a downward motion, acceleration and velocity away from the cylinder head for a period of time after top dead center of the crankshaft rod journal, such that, the piston crown may or may not achieve top dead center after the crankshaft rod journal top dead center.
Claim 5
Dependent Claim
37 words
The offset crankshaft assembly of claim 1, wherein one or more parallel piston rings are provided about the periphery of the piston skirt, said parallel piston rings being disposed around the piston skirt below the piston crown.
Claim 6
Dependent Claim
66 words
The offset crankshaft assembly of claim 1, wherein the piston is allowed an increased dwell time at distances closer to the cylinder head during a portion of the time between top dead center of the crankshaft rod journal and 90° crankshaft rotation after top dead center of the crankshaft rod journal when compared to the dwell profile of a single connecting rod assembly of similar length.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |