US4920934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve internal combustion engine
Assignee: Duebi Srl
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Filing: 1989-06-02
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Granted: 1990-05-01
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Expires: 2009-06-02
Abstract
Abstract The engine comprises three basic parts, of which one is the crankcase; the others consist in at least one modular liner-and-head casting, of which the liner part is accommodated slidably and to a fluid-tight in a respective bore afforded by the crankcase, and a cylindrical element accommodated freely and rotatably in a through hole formed from matched openings in the walls of the crankcase and in each modular cylinder head, in such a way that it functions additionally as a pin by means of which to assemble the modular components.
Inventors
- 👤 Marco Pizzicara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:51
CPC Classifications
F; F01; F01L; F01L7/00; F01L7/02; F01L7/021; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/027
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
326 words
A rotary valve internal combustion engine, comprising: a crankcase, affording at least one bore extending from an enclosure that is occupied by a crankshaft passing through and supported by the walls of the crankcase and disposed normal to the axis of the bore, of which the walls encompassing the bore afford at least one set of first coaxial cylindrical holes, located at the end of the bore farthest from the enclosure and disposed with axes parallel to that of the crankshaft; at least one cylindrical liner accommodated slidably in each bore of the crankcase, of which the end farthest from the enclosure merges with a head exhibiting at least one set of transversely disposed second coaxial holes, substantially equal in diameter to the first coaxial holes of the crankcase, which, with the liner occupying the respective bore of the crankcase, combine with the first set of holes to form at least one continuous bore extending parallel to the crankshaft axis; wherein each liner affords an axial bore with one open end directed toward the crankshaft enclosure, slidably and tightly accommodating a relative piston that is connected mechanically to the crankshaft, and combining with the piston to create a relative combustion chamber, each of the second holes connects by way of relative ports with the respective combustion chamber and with one or more inlet and/or exhaust ducts formed in and emerging externally of the head, and the head affords at least one hole extending from the outside wall toward the respective combustion chamber, serving to accommodate means for igniting or injecting a combustible mixture in or into the respective combustion chamber; at least one cylindrical valve element or rotor, accommodated rotatably internally of the first and second holes in the crankcase and the heads and providing means for assembly of the crankcase and head one with the other, connected mechanically to the crankshaft, and affording transverse passages designed to coincide cyclically with the inlet and exhaust ports.
Claim 2
Dependent Claim
326 words
A rotary valve internal combustion engine, comprising: a crankcase, affording at least one bore extending from an enclosure that is occupied by a crankshaft passing through and supported by the walls of the crankcase and disposed normal to the axis of the bore, of which the walls encompassing the bore afford at least one set of first coaxial cylindrical holes, located at the end of the bore farthest from the enclosure and disposed with axes parallel to that of the crankshaft; at least one cylindrical liner accommodated slidably in each bore of the crankcase, of which the end farthest from the enclosure merges with a head exhibiting at least one set of transversely disposed second coaxial holes, substantially equal in diameter to the first coaxial holes of the crankcase, which, with the liner occupying the respective bore of the crankcase, combine with the first set of holes to form at least one continuous bore extending parallel to the crankshaft axis; wherein each liner affords an axial bore with one open end directed toward the crankshaft enclosure, slidably and tightly accommodating a relative piston that is connected mechanically to the crankshaft, and combining with the piston to create a relative combustion chamber, each of the second holes connects by way of relative ports with the respective combustion chamber and with one or more inlet and/or exhaust ducts formed in and emerging externally of the head, and the head affords at least one hole extending from the outside wall toward the respective combustion chamber, serving to accommodate means for igniting or injecting a combustible mixture in or into the respective combustion chamber; at least one cylindrical valve element or rotor, accommodated rotatably internally of the first and second holes in the crankcase and the heads and providing means for assembly of the crankcase and head one with the other, connected mechanically to the crankshaft, and affording transverse passages designed to coincide cyclically with the inlet and exhaust ports.
Claim 3
Dependent Claim
73 words
A rotary valve engine as in claim 1, comprising a crankcase embodied in one or more modular units connectable one with the next, each provided with at least one bore extending from at least one relative enclosure and at least two cylindrical holes disposed coaxial with one each other and normal to the bore, wherein the crankshaft passes through and is supported by the walls of each modular unit, occupying the relative enclosure.
Claim 4
Dependent Claim
36 words
A rotary valve engine as in claim 1, comprising one set of first and second holes and one valve rotor only, wherein the transverse passages in the rotor and the ports in the head coincide diametrically.
Claim 5
Dependent Claim
43 words
A rotary valve engine as in claim 1, wherein the head associated with the single liner is provided with at least one internal gallery connecting with the gallery or galleries of the head adjacent, through which a flow of liquid coolant is directed.
Claim 6
Dependent Claim
32 words
A rotary valve engine as in claim 1, wherein each liner and the corresponding part of the crankcase combine to create a jacket through which a flow of liquid coolant is directed.
Claim 7
Dependent Claim
28 words
A rotary valve engine as in claim 1, wherein the valve rotor is provided with at least one gallery through which a flow of liquid coolant is directed.
Claim 8
Dependent Claim
25 words
A rotary valve engine as in claim 1, wherein the valve rotor is connected mechanically to the crank shaft by way of a timing belt.
Claim 9
Dependent Claim
25 words
A rotary valve engine as in claim 1, wherein the valve rotor is connected mechanically to the crank shaft by way of a chain drive.
Claim 10
Dependent Claim
26 words
A rotary valve engine as in claim 1, wherein the valve rotor is connected mechanically to the crank shaft by way of a train of gears.
Claim 11
Dependent Claim
25 words
A rotary valve engine as in claim 1, wherein the head associated with the cylindrical liner sections and/or crankcase are provided externally with cooling fins.
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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |