US3771501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston engine with multi explosion chambers
Assignee: DE DOBO A CH
•
Filing: 1971-11-01
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Granted: 1973-11-13
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Expires: 1991-11-01
Abstract
Abstract An improved rotary piston engine which provides a plurality of explosion chambers formed by the trochoidal contour of the rotary piston relative to quadrachoidal housing configuration whereby explosions occur in more than one chamber during a single rotation of the piston. The provision of multi-explosion chambers produces greater power and efficiency than in conventional rotary engines which have one explosion chamber. This improved engine also incorporates novel twin seals separating the various compression, exhaust and explosion chambers and is provided with an effective cooling system. The rotary piston is eccentrically mounted about the main drive shaft and power is transmitted from the piston to the main drive shaft via a novel planetary gear system.
Inventors
- 👤 Dobo T De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:25
CPC Classifications
F; F02; F02B; F02B53/00; F02B2053/005; F02B2730/00; F02B2730/01; F02B2730/018; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
196 words
A rotary piston engine comprising a housing having a cavity axially aligned in the housing with a piston rotatably mounted in said cavity, including a straight shaft rotatably mounted in said housing in axial alignmnt with the housing and extending transversely through the housing, piston, and cavity linearly, including means for rotating said piston eccentrically about said shaft, said means being movable relative to said shaft in combination with coacting means for transmitting eccentric rotation of said piston relative to said shaft to cause concentric rotation of said shaft in said housing, wherein piston is provided with peripheral surface contoured and spaced relative to said housing forming thereby within said cavity a plurality of spaced recesses between said housing and said piston, said recesses including at least a pair of spaced explosion chambers, each provided with spark plugs, including fuel intake and gas exhaust ports, said peripheral surfaces encompassing piston lobes adapted to sequentially compress fuel and exhaust combustion gases as the piston rotates, wherein the first said means coacts with the lobe contourse to cause the fuel in the explosion chambers to be in a state of maximum compression when the spark plugs cause combustion.
Claim 2
Dependent Claim
196 words
A rotary piston engine comprising a housing having a cavity axially aligned in the housing with a piston rotatably mounted in said cavity, including a straight shaft rotatably mounted in said housing in axial alignmnt with the housing and extending transversely through the housing, piston, and cavity linearly, including means for rotating said piston eccentrically about said shaft, said means being movable relative to said shaft in combination with coacting means for transmitting eccentric rotation of said piston relative to said shaft to cause concentric rotation of said shaft in said housing, wherein piston is provided with peripheral surface contoured and spaced relative to said housing forming thereby within said cavity a plurality of spaced recesses between said housing and said piston, said recesses including at least a pair of spaced explosion chambers, each provided with spark plugs, including fuel intake and gas exhaust ports, said peripheral surfaces encompassing piston lobes adapted to sequentially compress fuel and exhaust combustion gases as the piston rotates, wherein the first said means coacts with the lobe contourse to cause the fuel in the explosion chambers to be in a state of maximum compression when the spark plugs cause combustion.
Claim 3
Dependent Claim
30 words
An engine as in claim 1 wherein the piston lobes are fewer in number than the said recesses and wherein each lobe substantially conforms to the shape of each recess.
Claim 4
Dependent Claim
55 words
An engine as in claim 2 wherein the piston lobes are similar and symmetrical about the piston axis of rotation, and wherein, the recesses conform substantially to the shape of said lobes, the number of said lobes being such that the lobes will substantially occupy all recesses except two in any position of the piston.
Claim 5
Dependent Claim
21 words
An engine as in claim 3 wherein the piston has three similar, equispaced arcuate lobes disposed symmetrically about the piston axis.
Claim 6
Dependent Claim
78 words
An engine as in claim 4 wherein said means comprises a disc rotatably mounted axially in said piston and a planetary gear mounted on said disc rotatably including gears mounted on the piston and shaft coacting with said planetary gear to transmit motion from the piston to the shaft, said housing having an internal gear coacting with said planetary gear, said gears being synchronized to position the lobes in the recesses to cause maximum combustion pressure during ignition.
Claim 7
Dependent Claim
42 words
An engine as in claim 1, wherein each of said piston lobes includes twin spaced sealing means mounted radially movable in said piston and extending beyond said peripheral surface at the apex of said lobes into sliding resilient abuttment with the housing.
Claim 8
Dependent Claim
18 words
An engine as in claim 6 wherein said sealing means are fluid pressure biased outward of the pistons.
Claim 9
Dependent Claim
17 words
An engine as in claim 7 including a cooling canal proviDed in the housing encompassing the recesses.
Claim 10
Dependent Claim
26 words
An engine as in claim 1 wherein the first said means includes a disc mounted axially rotatably within said piston between said shaft and said piston.
Claim 11
Dependent Claim
16 words
An engine as in claim 9 wherein said disc is mounted eccentrically rotatably about said shaft.
Claim 12
Dependent Claim
49 words
An engine as in claim 10 wherein said disc incoudes a rotatable gear extending laterally from said disc and parallel to said shaft, said gear coacting with the second means to simultaneously cause eccentric rotation of the piston and concentric rotation of the shaft relative to the housing axis.
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |