US2737171A - Cylinders of two-cycle motors - Google Patents

Cylinders of two-cycle motors Download PDF

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US2737171A
US2737171A US320171A US32017152A US2737171A US 2737171 A US2737171 A US 2737171A US 320171 A US320171 A US 320171A US 32017152 A US32017152 A US 32017152A US 2737171 A US2737171 A US 2737171A
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cylinders
heat
motors
aluminium
conduit
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US320171A
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Torre Pier Luigi
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    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/02—Surface coverings of combustion-gas-swept parts
    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0436—Iron
    • F05C2201/0439—Cast iron
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the present invention relates to two-cycle motors and more particularly cylinders of two-cycle motors of the type cast in aluminium alloy or the like, on a steel or cast-iron tube.
  • the exhaust, inlet and scavenging conduits are provided in the aluminium part also carrying the cooling fins.
  • the solution forming an object of the present invention aims to hinder said heat ow that detrimentallyaffects the lilling coetiicient of the cylinder and therefore the power of the motor.
  • Figures 1 and 2 respectively represent a vertical and a horizontal section of a half a cylinder with its exhaust conduit provided with the improvement according to the present invention
  • FIGS 3 and 4 are two sections analogous to the preceding ones, of another form of embodiment of the invention.
  • the cylinder comprises a liner 1, made of cast iron or of steel, onto which a light alloy, ncarrying envelope 2 'is cast, said envelope also comprising the exhaust conduit 3.
  • said exhaust conduit is lined, in the case illustrated, for the part coming into contact with the exhaust gases, with a metal sheet jacket 4 made of a heat resisting material, and perfectly matching the inside shape of conduit 3.
  • Said jacket can either be simply inserted into conduit 3 or it may be inserted during the casting operation, in which case, however, it is necessary to so prepare the surface of said metal sheet jacket that the aluminium casting 3 does not take a hold on it. The reason is that in case such a hold should take place a perfect transmission of heat would be had from jacket 4 to the aluminium, whereas it is desired that said transmission be vthe smallest possible in order to prevent the propagation of heat to the, mass of the cylinder.
  • a cylinder comprising a liner, a reinforcing jacket surrounding said liner and having an exhaust conduit integral therewith and extending outwardly therefrom for a predetermined distance and terminating in an outer edge, a sleeve within said conduit loosely contiguous with the walls thereof to etect a heat barrier, said sleeve having a radial ange at its outer extremity in gripping relation with the outer edge of said conduit to render said sleeve and conduit integral.

Description

March 6, 1956 P. L. TORRE 2,737,171
CYLINDERS OF TWO-CYCLE MOTORS Filed Nov. 15, 1952 IN VEN TOR. l P/E L (//G/ TOZE' A Trag/VWS United States Patent O CYLINDERS F TWO-CYCLE MOTORS Pier Luigi Torre, Milan, Italy Application November 13, 1952, Serial No. 320,171
1 Claim. (Cl. 12S- 193) The present invention relates to two-cycle motors and more particularly cylinders of two-cycle motors of the type cast in aluminium alloy or the like, on a steel or cast-iron tube.
It is a known practice to employ, for two stroke motors, cylinders formed by a cast iron or steel liner, onto which, by a known process, a light alloy is cast after a special preparation of the liners surface, s0 as to create a true and proper transition alloy between the aluminium and the liner, this being very efficacious for a good heat transmission.
The exhaust, inlet and scavenging conduits are provided in the aluminium part also carrying the cooling fins. v
Such a solution possesses substantial cost and weight advantages; however, nothwithstanding the good thermic conductivity of aluminium assisting in the carrying away of heat, it has been noticed that with such cylinders the power developed by the motors using cylinders completely cast of cast iron, cannot be attained. Experience also shows that the entire cylinder body attains an appreciably higher temperature than does the cast iron one, dependently from the high heat tlow that traversing the exhaust conduit propagates itself to the cylinder mass.
The solution forming an object of the present invention aims to hinder said heat ow that detrimentallyaffects the lilling coetiicient of the cylinder and therefore the power of the motor.
The accompanying drawing shows schematically and by way of example two ways for practically realising the invention and specifically:
Figures 1 and 2 respectively represent a vertical and a horizontal section of a half a cylinder with its exhaust conduit provided with the improvement according to the present invention;
Figures 3 and 4 are two sections analogous to the preceding ones, of another form of embodiment of the invention.
As results from Figures 1 and 2, the cylinder comprises a liner 1, made of cast iron or of steel, onto which a light alloy, ncarrying envelope 2 'is cast, said envelope also comprising the exhaust conduit 3. According to the present invention, said exhaust conduit is lined, in the case illustrated, for the part coming into contact with the exhaust gases, with a metal sheet jacket 4 made of a heat resisting material, and perfectly matching the inside shape of conduit 3. Said jacket can either be simply inserted into conduit 3 or it may be inserted during the casting operation, in which case, however, it is necessary to so prepare the surface of said metal sheet jacket that the aluminium casting 3 does not take a hold on it. The reason is that in case such a hold should take place a perfect transmission of heat would be had from jacket 4 to the aluminium, whereas it is desired that said transmission be vthe smallest possible in order to prevent the propagation of heat to the, mass of the cylinder.
According to the embodiment illustrated in Figures 3 and 4, we still have a liner 1 coated with a body of cast aluminium 2, with fins for dispersing the heat. In this case, the exhaust conduit 3 is lined with a metal sheet 4, so disposed, however, as to leave between the aluminium casting 3 and sheet 4 an air space, and this to the end of still more hindering the heat ow. Said air space 5 can be obtained in a simple manner by means of two projections 6 and 7 provided on the metal sheet at the two ends of it, respectively.
It is evident from the preceding description that the improvement being the object of the invention is simple as to realisation, economical as to cost and such as to assure remarkable working advantages to the motor.
Of course, the dimensions and the material constituting the sheet metal lining of the exhaust conduit, its manner of application and the whole of the constructional details, may vary without, however, going out for this reason from the leld of the present invention.
What I claim is:
In an internal combustion engine, a cylinder comprising a liner, a reinforcing jacket surrounding said liner and having an exhaust conduit integral therewith and extending outwardly therefrom for a predetermined distance and terminating in an outer edge, a sleeve within said conduit loosely contiguous with the walls thereof to etect a heat barrier, said sleeve having a radial ange at its outer extremity in gripping relation with the outer edge of said conduit to render said sleeve and conduit integral.
References Cited inthe tile of this patent UNITED STATES PATENTS 1,666,194 Brockway Apr. 17, 1928 2,009,130 Bachle July 23, 1935 2,395,110 Forrest Feb. 19, 1946 2,438,669 Krenzke Mar. 30, 1948 FOREIGN PATENTS 638,964 Germany Nov. 26, 1936
US320171A 1952-11-13 1952-11-13 Cylinders of two-cycle motors Expired - Lifetime US2737171A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2855911A (en) * 1954-12-17 1958-10-14 Rockwell Gmbh Air cooled two stroke cycle diesel engine
DE1206203B (en) * 1961-08-04 1965-12-02 Kloeckner Humboldt Deutz Ag Cylinder for air-cooled internal combustion engines
US3983696A (en) * 1974-05-15 1976-10-05 Audi Nsu Auto Union Aktiengesellschaft Combustion engine having at least one outlet passage
US4031699A (en) * 1974-10-25 1977-06-28 Fuji Jukogyo Kabushiki Kaisha Port liner assembly
US4191156A (en) * 1976-12-30 1980-03-04 Piaggio & C. S.P.A. Two-stroke, water-cooled internal combustion engine having the cylinder liners removable from the cylinder block
US4630345A (en) * 1983-03-24 1986-12-23 Sachs-Systemtechnik Gmbh Method for manufacturing a cylinder unit for a cylinder piston combustion engine
WO2009124414A1 (en) * 2008-04-08 2009-10-15 可立新实业有限公司 A sleeve for engine cylinder head
US20100005798A1 (en) * 2008-07-08 2010-01-14 J. Eberspaecher Gmbh & Co. Kg Exhaust System
US11486293B2 (en) * 2020-08-28 2022-11-01 Honda Motor Co., Ltd. Exhaust structure of internal combustion engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666194A (en) * 1921-06-08 1928-04-17 Ind Res Corp Air-cooled internal-combustion engine
US2009130A (en) * 1931-10-08 1935-07-23 Continental Motors Corp Engine
DE638964C (en) * 1936-11-26 Humboldt Deutzmotoren A G Lubrication for working cylinders of two-stroke internal combustion engines
US2395110A (en) * 1944-05-17 1946-02-19 Mark L Forrest Two-cycle engine
US2438669A (en) * 1943-01-04 1948-03-30 Jacobsen Mfg Co Motor fuel power induction device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE638964C (en) * 1936-11-26 Humboldt Deutzmotoren A G Lubrication for working cylinders of two-stroke internal combustion engines
US1666194A (en) * 1921-06-08 1928-04-17 Ind Res Corp Air-cooled internal-combustion engine
US2009130A (en) * 1931-10-08 1935-07-23 Continental Motors Corp Engine
US2438669A (en) * 1943-01-04 1948-03-30 Jacobsen Mfg Co Motor fuel power induction device
US2395110A (en) * 1944-05-17 1946-02-19 Mark L Forrest Two-cycle engine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2855911A (en) * 1954-12-17 1958-10-14 Rockwell Gmbh Air cooled two stroke cycle diesel engine
DE1206203B (en) * 1961-08-04 1965-12-02 Kloeckner Humboldt Deutz Ag Cylinder for air-cooled internal combustion engines
US3983696A (en) * 1974-05-15 1976-10-05 Audi Nsu Auto Union Aktiengesellschaft Combustion engine having at least one outlet passage
US4031699A (en) * 1974-10-25 1977-06-28 Fuji Jukogyo Kabushiki Kaisha Port liner assembly
US4191156A (en) * 1976-12-30 1980-03-04 Piaggio & C. S.P.A. Two-stroke, water-cooled internal combustion engine having the cylinder liners removable from the cylinder block
US4630345A (en) * 1983-03-24 1986-12-23 Sachs-Systemtechnik Gmbh Method for manufacturing a cylinder unit for a cylinder piston combustion engine
WO2009124414A1 (en) * 2008-04-08 2009-10-15 可立新实业有限公司 A sleeve for engine cylinder head
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
US11486293B2 (en) * 2020-08-28 2022-11-01 Honda Motor Co., Ltd. Exhaust structure of internal combustion engine

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