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US3612014A Expired / Lapsed US ⏱️ 0.0 years remaining

Two cycle rear compression engine porting and transfer passage arrangement

Assignee: Individual
•
Filing: 1969-08-22
•
Granted: 1971-10-12
•
Expires: 1989-08-22
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Abstract

Abstract Two-cycle, crankcase compression engines, spark or compression ignition, carburetion or fuel injection types, with or without supercharging, having improved balancing of restrictions to flow of air or air-fuel fluids through the engine; having at least one crankcase inlet port(s) location in the cylinder wall on the same side of the cylinder as the exhaust port(s) and below the level of the exhaust ports, having a plurality of transfer ports, at least some of which are located on the opposite side of the cylinder with the flow therefrom directed toward the cylinder head plus other transfer port(s) located and shaped so as to direct flow in a plane more nearly at right angles to the cylinder axis and thence merging with flow from the oppositely located transfer port(s), along the cylinder wall in a direction away from the exhaust port(s); the height of the exhaust port(s) for optimum operational characteristics being more than approximately 35 percent of stroke; in a modified form, in addition to the inlet below the exhaust port, including another subsidiary inlet(s) into the crankcase located below the oppositely situated transfer port(s); in engine propelled vehicles such as snowmobiles, where operator position is such that the engine is between the legs and near his crotch, the improvement of having inlet (carburetor) and exhaust on the same side of engine and locating such slide away from crotch of operator, the side of the engine towards the operator being devoid of hot or vaporous engine protuberances. Improvements that, in some forms, the engine is combined with a resonant exhaust system; improvements in attachment of inlet and exhaust manifolds are provided to minimize and/or regulate heat transfer between exhaust manifold, cylinder and intake manifold, to minimize backflow of heat from the exhaust manifold to the cylinder and inlet manifold and to regulate temperature of various engine parts.

Inventors

  • 👤 William L Tenney

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 19:08
CPC Classifications
F; F02; F02B; F02B25/00; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B2720/00; F02B2720/13; F02B2720/136

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 247 words
In a two-cycle piston-valved, internal combustion engine wherein at least some of the gases comprising the combustion engine wherein at least some of the gases comprising the combustion charge are received into the crankcase through an inlet port valved by the piston skirt and compressed in the crankcase for transfer to the cylinder, and in which the combustion gases are released from the cylinder through an exhaust port valved by the top edge of the piston, the improvement comprising, locating said inlet port and exhaust port in the same side of the cylinder spaced in axial direction of said cylinder and at least partially overlapping circumferentially in said cylinder with the inlet port spaced between the crankcase and the exhaust port, providing transfer passageways from the crankcase and emanating as ports in the cylinder wall so as to be valved by said piston, at least one of said transfer ports, called the opposite transfer port, being in that portion of the cylinder wall, called the opposite side of the cylinder, opposite from that portion having the exhaust port, and other transfer ports, called side transfer ports, in the cylinder wall and spaced so as circumferentially to be between that side of the cylinder having the exhaust port therein and the opposite side of the cylinder, said side and opposite transfer ports and passages adjacent thereto being shaped so that flow therefrom meets and flows generally away from the crankcase and along the opposite side of the cylinder.
Claim 2
Dependent Claim 247 words
In a two-cycle piston-valved, internal combustion engine wherein at least some of the gases comprising the combustion engine wherein at least some of the gases comprising the combustion charge are received into the crankcase through an inlet port valved by the piston skirt and compressed in the crankcase for transfer to the cylinder, and in which the combustion gases are released from the cylinder through an exhaust port valved by the top edge of the piston, the improvement comprising, locating said inlet port and exhaust port in the same side of the cylinder spaced in axial direction of said cylinder and at least partially overlapping circumferentially in said cylinder with the inlet port spaced between the crankcase and the exhaust port, providing transfer passageways from the crankcase and emanating as ports in the cylinder wall so as to be valved by said piston, at least one of said transfer ports, called the opposite transfer port, being in that portion of the cylinder wall, called the opposite side of the cylinder, opposite from that portion having the exhaust port, and other transfer ports, called side transfer ports, in the cylinder wall and spaced so as circumferentially to be between that side of the cylinder having the exhaust port therein and the opposite side of the cylinder, said side and opposite transfer ports and passages adjacent thereto being shaped so that flow therefrom meets and flows generally away from the crankcase and along the opposite side of the cylinder.
Claim 3
Dependent Claim 45 words
The combination of claim 1 further characterized in that the height of the exhaust port measured from the top edge of the piston at lower dead center position to the top of the exhaust port is more than 35 percent of stroke of the piston.
Claim 4
Dependent Claim 39 words
The combination specified in claim 1 further characterized in that at least one of said transfer passages is in the form of a groove in the cylinder wall, said groove extending from the crankcase to the corresponding transfer port.
Claim 5
Dependent Claim 59 words
The combination specified in claim 1 further characterized in that at least one of said transfer passageways communicates with a port in the piston wall so as to be open to the interior of the piston and receive compressed crankcase charge therethrough when the port served by said transfer passage is uncovered by the top edge of the piston.
Claim 6
Dependent Claim 96 words
The combination of claim 1 further characterized in that the exhaust port communicates through an exhaust passage in the cylinder wall to an exhaust exit port in an exhaust flange seat and the inlet port communicates through an inlet passage in the cylinder wall to an inlet entrance port in an inlet flange seat and that flanged exhaust and inlet manifolds are bolted respectively to the exhaust flange seat and intake flange seat, gaskets being provided between each flange and its seat, at least one of said gaskets being of a material having low heat conductivity.
Claim 7
Dependent Claim 21 words
The combination of claim 5 further characterized in that the length of the exhaust and intake passage are of minimal length.
Claim 8
Dependent Claim 26 words
The combination of claim 5 further characterized in that the exhaust and intake passages are not of equal length, one being long and the other short.
Claim 9
Dependent Claim 33 words
The combination of claim 4 further characterized in that a supplemental inlet port is located in the cylinder below the level of that transfer port which communicates with a port in the piston.
Claim 10
Dependent Claim 20 words
The combination of claim 1 further characterized in that said exhaust exit port is connected to a resonant exhaust system.
Claim 11
Dependent Claim 19 words
The combination of claim 2 further characterized in that said exhaust port is connected to a resonant exhaust system.
Claim 12
Dependent Claim 25 words
The two-cycle piston-valved internal combustion engine of claim 1 further characterized in that a major portion of said inlet port and exhaust port overlap circumferentially.
Claim 13
Dependent Claim 37 words
The combination as specified in claim 11 wherein said transfer ports are arranged to open through said cylinder wall in all sectors of the circumference of said cylinder wall except in the region of said exhaust port.
Claim 14
Dependent Claim 38 words
The combination as specified in claim 12 wherein the transfer port opposite from said exhaust port opens to a transfer passageway defined by surfaces which direct entering fresh charge gases generally toward the distal end of the cylinder.

References Cited (Backward Citations)

US1729392A Cited
US2115657A Cited
US2218332A Cited
US2816529A Cited
US2822793A Cited
US2967516A Cited
US3374776A Cited
US3453994A Cited
US3395679A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-10-11 1975-04-12 1975-10-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-10-11 1979-04-12 1979-10-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-10-11 1983-04-12 1983-10-12 $7700.00 Window Closed / Lapsed

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