US3851631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die cast v-type two-cycle engine
Assignee: KIEKHAEFER AEROMARINE MOTORS
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Filing: 1973-03-16
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Granted: 1974-12-03
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Expires: 1993-03-16
Abstract
Abstract A compact V-type two-cycle engine has one-half of the crankcase cast integrally with the cylinder or cylinders on one side of the V and joined with a corresponding cast unit in a parting plane bisecting the V. The cylinder heads are cast integral with the corresponding cylinders, and each pair of cylinders in the V formation has its pistons connected to the same crank pin of the crank-shaft. A liner sleeve in the crankcase cooperates with a circular disc centrally of the crank pin to separate the compression chambers for the two cylinders. The engine is disposed with the V inverted and provision is made to keep the crankcase and pistons free of any unburned fuel charge accumulation.
Inventors
- 👤 E Kiekhaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:18
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0043; F02F7/0058; F02B; F02B25/00; F02B25/26; F02B25/28; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02F1/00; F02F1/002; F02F7/0002; F02F7/0012; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/1804; F02B2075/1808; F02B2275/00; F02B2275/30; F02B61/00; F02B61/04; F02B61/045; F02F2200/00; F02F2200/06; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
144 words
A V-type two-cycle engine comprising a pair of symmetrically disposed separate engine block units, each unit providing an integral cylinder, cylinder head and a crank case half; a pair of like end closure members for the crank case, each carrying a bearing for supporting a crank shaft main journal; a crank shaft having a single crank pin carrying the connecting rods for the pistons operative in said cylinders; sleeve means lining said crank case between said end closures; rotating partition means on said crank pin and radially sealed at its periphery to said sleeve means to divide said crank case into separate compression chambers for feeding fuel-air charge to said cylinders; and means joining said engine block units on a parting plane containing the axis of said crank shaft and bisecting a V angle of approximately 90* between the cylinders of said two units.
Claim 2
Dependent Claim
144 words
A V-type two-cycle engine comprising a pair of symmetrically disposed separate engine block units, each unit providing an integral cylinder, cylinder head and a crank case half; a pair of like end closure members for the crank case, each carrying a bearing for supporting a crank shaft main journal; a crank shaft having a single crank pin carrying the connecting rods for the pistons operative in said cylinders; sleeve means lining said crank case between said end closures; rotating partition means on said crank pin and radially sealed at its periphery to said sleeve means to divide said crank case into separate compression chambers for feeding fuel-air charge to said cylinders; and means joining said engine block units on a parting plane containing the axis of said crank shaft and bisecting a V angle of approximately 90* between the cylinders of said two units.
Claim 3
Dependent Claim
17 words
The engine of claim 1 in which the rotating partition means is integral with said crank pin.
Claim 4
Dependent Claim
50 words
The engine of claim 1 in which only said crank pin of said crank shaft is hardened to provide a hard wear resisting surface for the bearings of said connecting rods, and the main journals of the crank shaft are of a material specifically selected for toughness rather than hardenability.
Claim 5
Dependent Claim
27 words
The engine of claim 1 and means to mount the same inverted whereby said cylinders extend downwardly from said crank case at an angle to each other.
Claim 6
Dependent Claim
32 words
The engine of claim 4 in which said mounting means comprises resilient support means for the corresponding engine block units located substantially at the extremities of the V angle between the cylinders.
Claim 7
Dependent Claim
20 words
The engine of claim 4 and means to drain the inside of each piston of any accumulation of fuel constituents.
Claim 8
Dependent Claim
40 words
A V-type two-cycle engine as specified in claim 1 in which the engine is disposed with the V angle between the cylinders inverted, and resilient support means therefor located substantially at the extremities of the V angle between the cylinders.
Claim 9
Dependent Claim
28 words
A V-type two-cycle engine disposed with the V angle between the cylinders inverted, and means to drain the inside of each piston of any accumulation of fuel constituents.
Claim 10
Dependent Claim
28 words
A V-type two-cycle engine disposed with the V angle between the cylinders inverted, and means to drain the inside of each piston of any accumulation of fuel constituents.
Claim 11
Dependent Claim
55 words
The engine of claim 8 in which said drain means comprises an auxiliary fuel-air charge transfer passage on the underside of the cylinder bore with means to connect the same to the lower region inside the corresponding piston to additionally drain any accumulation of fuel constituents from inside of the piston to the combustion chamber.
Claim 12
Dependent Claim
35 words
The engine of claim 8 in which said drain means comprises a passage leading angularly downward from the lower region of the inside of each piston to a piston ring groove of the corresponding piston.
Claim 13
Dependent Claim
30 words
The engine of claim 4 wherein a spark plug for each cylinder is disposed with its spark gap region above the lowermost extremity of the combustion chamber in the cylinder.
Claim 14
Dependent Claim
40 words
The engine of claim 4 and means to supply a fuel-air charge to the compression chamber above the combustion chamber of each cylinder, whereby gravity assists in the transfer of the fuel-air charge from said means to the combustion chamber.
Claim 15
Dependent Claim
19 words
The engine of claim 12 in which said fuel-air charge supply means is disposed above the corresponding crank chambers.
Claim 16
Dependent Claim
34 words
The engine of claim 12 in which each said fuel-air charge supply means connects with the compression chamber through a piston controlled passage in the wall of the corresponding cylinder above the combustion chamber.
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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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |