US3776201A - Exhaust arrangement in a rotary-piston internal combustion engine - Google Patents

Exhaust arrangement in a rotary-piston internal combustion engine Download PDF

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Publication number
US3776201A
US3776201A US00284897A US3776201DA US3776201A US 3776201 A US3776201 A US 3776201A US 00284897 A US00284897 A US 00284897A US 3776201D A US3776201D A US 3776201DA US 3776201 A US3776201 A US 3776201A
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United States
Prior art keywords
port
casing
exhaust
arrangement
circumferentially
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Expired - Lifetime
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US00284897A
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English (en)
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H Sabet
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/02—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F01C1/063—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents with coaxially-mounted members having continuously-changing circumferential spacing between them
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2730/00—Internal-combustion engines with pistons rotating or oscillating with relation to the housing
    • F02B2730/09—Arrangements or specially formed elements for engines according to the preceding groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S60/00—Power plants
    • Y10S60/901—Exhaust treatment special to rotary internal combustion engines

Definitions

  • ABSTRACT In a rotary-piston, internal combustion engine in which pistons rotate about the axis of a cylindrical casing in circumferentially consecutive relationship in sealing engagement with the casing and move angularly relative to each other in such a manner that each pair of circumferentially consecutive pistons defines a combustion chamber of the engine which expands and contracts during rotation, the casing is formed with an intake port for admitting a fuel mixture to the expanding chambers and with an exhaust port and an auxili- 5 Claims, 2 Drawing Figures PATENTEUBEB 4 m5 sum 10; 2
  • a rotary-piston, internal-combustion engine in which a fluid combustion mixture .is exploded in combustion chambers between pistons which rotate about the axis of a'casing ofcircular cross section while sealinglyengaging the .casing in circumferentially consecutive relationship, and the .chambers are expanded and contracted by relative angular movement of the two pistons bounding each chamber.
  • Intake and exhaust ports communicate with the chambers during rotation of the pistons to supply the combustion mixture to the expanding chambers and .to'release spent combustion gases from the' contractingchambers when the chambers communicate with the respective ports.
  • the port first communicating with a combustion chamber during operation of the engine- will hereinafter be'refe'rred to as the exhaust port, while the second port spaced circumferentially in the engine casing from the last-mentioned exhaust port in the direction of rotary piston movement will be referred to as the auxiliary .port.
  • the spacing of the two ports is smaller than the circumferential width of the exhaust port and respective conduits extend from the two ports in a direction outward of the casing.
  • One of the conduits has a throat portion, and the other conduit terminates in an open nozzle portion located in the throat portion and constituting therewith an ejector or jet pump.
  • FIG. 1 shows an exhaust arrangement of the inventionin fragmentary, radial section throughthe engine rangement of the simultaneously filed application recasing on the line I I in'FIG. 2;
  • FIG. 2 is a developed, fragmentary view of the inner face of the engine casing partly shown in FIG. 1.
  • FIG. 1 there is shown-only as much of the engine disclosed in the two afore-mentioned copending applications as is needed for an understanding of the'invention, the principal operating parts of the engine being respresented only by a portion of the cylindrical casing wall l.
  • Another tube 7 having the approximate shape of a skewed frustum of a cone is sealed to the outer face of the casing 1 so as to enclose the orifice of theauxiliary port 4 and spacedly to envelop the tube 5.
  • the tube 7 tapers in a direction outward of the casing 1 toward a throat portion of 8 of circular cross section about an axis which coincides with that of the nozzle 6.
  • the throat portion 8 axially converges and then diverges and is dimensioned to define an annular gap about the common axis with the nozzle 6.
  • Two restricted apertures 9 in the diverging portion of the throat 8 connect the interior of the latter contiguously adjacent the open end of the nozzle 6 with the ambient aperture.
  • a cylindrical chamber 10, coaxial with the throat 8 and the nozzle 6 extends from the throat 8 away from the ports 3, 4.
  • the end of the chamber 10 not seen in FIG. 1 communicates with the atmosphere.
  • An ignition element 11, electrically headed or of catalytic platinum group metal, is centered in the cross section of the chamber 10 and supported on a spider 11' so as to offer minimal r'esistance' to the discharged gases.
  • a blanket 12 of thermal insulation material covers the outer surface of the tube 7 and of the throat 8.
  • the exhaust port 3 and the auxiliary port 4 are identical rectangular openings in the casing wall 1 which are circumferentially aligned in a common radial plane while the intake port 13 is located in a second radial plane axially spaced in the casing wall 1 from the plane of the ports 3, 4, and is circumferentially offset from the auxiliary port 4 in the direction of rotary movement of the non-illustrated pistons in the casing I, the movement being counterclockwise, as viewed in FIG. 1, and from the right to the left as viewed in FIG. 2.
  • a narrow axial slot 14 in the casing wall 1 is axially aligned with the portion of the auxiliary port 4 farthest from the exhaust port 3 and circumferentially aligned with the intake port 13. Its orifice in the outer face of the casing wall 1 freely communicates with theambient atmosphere outside the tube 7.
  • the pistons in the casing 1 which alternatingly block and clear the ports 3,4,13 and the slot 14 during their movement about the axis of the casing wall 1 have been shown in detail in the simultaneously filed application referred to above.
  • a chamber containing hot gases of combustion and circumferentially bounded by two pistons contracts while communicating with the exhaust port 3.
  • the hot compressed gases are discharged through the nozzle 6, thereby producing a subatmospheric pressure in the tube 7 between the auxiliary port 4 and the throat 8.
  • the auxiliary port 4 is cleared by the piston leading the contracting combustion chamber, and the discharge from the chamber of the residual gases of reduced pressure is enhanced by the suction effect of the jet pump 6,8.
  • a small amount of atmospheric air is drawn into the combustion chamber through the slot 4 to scavenge the chamber, and is partly mixed with the discharged gas.
  • the gases are kept hot in the ejection pump 6,8 by the insulating blanket 12, and the normal operating temperature of the tubes 5,7, particularly that of the pipe '5, is not significantly different from that of the combustion gases for high efficiency of the pump.
  • the device illustrated and described will be repeated-around the circumference of the casing wall 1 as often as the specific number and operation of the non-illustrated pistons requires, and that the several chambers may be linked to a common exhaust pipe or to plural exhaust pipes in a manner conventional in automotive engineering.
  • the chamber 10 alone or in combination with an associated exhaust pipe causes the combustion gases to be discharged at a substantially uniform rate although they leave the ports 3,4 intermittently.
  • the ports 3,4 may communicate respectively with two circumferentially consecutive combustion chambers of the engine in such a manner that the exhaust port 3 and the nozzle 6 communicate with a combustion chamber in which the prevailing pressure is higher than in the chamber communicating with the auxiliary port 4, and such an arrangement is most effective and preferred. It requires the circumferential piston face to be of smaller angular width relative to the casing axis than the combined angular width of the ports 3,4 and the partition 2. In such an arrangement, the slot 14 may be omitted because scavenging of the combustion chamber is not necessary when strong suction is developed at the ejection pump 6,8 for a relatively long period.
  • An exhaust arrangement in an internalcombustion, rotary-piston engine having a cylindrical casing including a wall of circular cross section perpendicular to an axis of said wall, said wall being formed with an intake port for admitting a fluid to said casing and with an exhaust port for releasing fluid from said casing, the improvement which comprises:
  • said wall being formed with an auxiliary port circumferentially interposed between-said intake and exhaust ports, said auxiliary port extending in a common plane perpendicular to said axis with said exhaust port, the circumferential spacing of said auxiliary port from said intake port and from said exhaust port being substantially smaller than the circumferential width of any one of said ports,
  • a first conduit elongated in a radially outward direction and communicating with said exhaust port, said conduit having a terminal nozzle portion of reduced cross section remote from said wall,
  • a second conduit communicating with said auxiliary port and having a throat portion of reduced cross section spacedly enveloping said nozzle portion, said second conduit flaring in a direction radially outward of said throat portion, whereby said conduits jointly constitute an ejector pump.
  • said second conduit having a chamber portion of greater cross section than said throat portion and extending from said throat portion in a direction outward of said cas ing, and igniting means for igniting a combustible fluid in said chamber portion;
  • said throat portion being formed with a restricted aperture therethrough, said aperture communicating with ambient atmosphere.
  • said casing being formed with an aperture therethrough, said aperture being circumferentially coextensive with said auxiliary port, having a flow section smaller than said auxiliary port, and communicating with the ambient atmosphere.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
US00284897A 1971-10-19 1972-08-30 Exhaust arrangement in a rotary-piston internal combustion engine Expired - Lifetime US3776201A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712151988 DE2151988A1 (de) 1971-10-19 1971-10-19 Vorrichtung an umlaufkolbenmotoren

Publications (1)

Publication Number Publication Date
US3776201A true US3776201A (en) 1973-12-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00284897A Expired - Lifetime US3776201A (en) 1971-10-19 1972-08-30 Exhaust arrangement in a rotary-piston internal combustion engine

Country Status (6)

Country Link
US (1) US3776201A (de)
JP (1) JPS5427483B2 (de)
DD (1) DD99414A5 (de)
DE (1) DE2151988A1 (de)
FR (1) FR2157530A5 (de)
IT (1) IT964085B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983696A (en) * 1974-05-15 1976-10-05 Audi Nsu Auto Union Aktiengesellschaft Combustion engine having at least one outlet passage
WO1996023133A1 (en) * 1995-01-25 1996-08-01 Pfefferle William C Catalytic method
US20100005798A1 (en) * 2008-07-08 2010-01-14 J. Eberspaecher Gmbh & Co. Kg Exhaust System

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1255403A (en) * 1915-10-30 1918-02-05 Albert R Gardner Rotary internal-combustion engine.
US1298839A (en) * 1917-05-11 1919-04-01 Howard L Weed Rotary engine.
GB630461A (en) * 1947-06-19 1949-10-13 Jozsef Katona Engine comprising rotary pistons
GB947812A (en) * 1960-03-16 1964-01-29 Adelmo Bergeretto A rotary internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1255403A (en) * 1915-10-30 1918-02-05 Albert R Gardner Rotary internal-combustion engine.
US1298839A (en) * 1917-05-11 1919-04-01 Howard L Weed Rotary engine.
GB630461A (en) * 1947-06-19 1949-10-13 Jozsef Katona Engine comprising rotary pistons
GB947812A (en) * 1960-03-16 1964-01-29 Adelmo Bergeretto A rotary internal combustion engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983696A (en) * 1974-05-15 1976-10-05 Audi Nsu Auto Union Aktiengesellschaft Combustion engine having at least one outlet passage
US6205777B1 (en) * 1991-01-09 2001-03-27 Precision Combustion, Inc. Catalytic method
WO1996023133A1 (en) * 1995-01-25 1996-08-01 Pfefferle William C Catalytic method
US20100005798A1 (en) * 2008-07-08 2010-01-14 J. Eberspaecher Gmbh & Co. Kg Exhaust System
US8418459B2 (en) * 2008-07-08 2013-04-16 J. Eberspaecher Gmbh & Co. Kg Exhaust system

Also Published As

Publication number Publication date
FR2157530A5 (de) 1973-06-01
JPS5427483B2 (de) 1979-09-10
DE2151988A1 (de) 1973-04-26
IT964085B (it) 1974-01-21
DD99414A5 (de) 1973-08-05
JPS4848809A (de) 1973-07-10

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