US3601101A - Air-cooled internal combustion engine with soundproofing enclosure - Google Patents

Air-cooled internal combustion engine with soundproofing enclosure Download PDF

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Publication number
US3601101A
US3601101A US824899A US3601101DA US3601101A US 3601101 A US3601101 A US 3601101A US 824899 A US824899 A US 824899A US 3601101D A US3601101D A US 3601101DA US 3601101 A US3601101 A US 3601101A
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United States
Prior art keywords
cooling
air
engine
crankcase
distributing chamber
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Expired - Lifetime
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US824899A
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English (en)
Inventor
Gerhard Thien
Heinz Fachbach
Bernd Nowotny
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P1/00—Air cooling
    • F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P1/00—Air cooling
    • F01P1/06—Arrangements for cooling other engine or machine 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
    • F02B77/13—Acoustic insulation

Definitions

  • the invention relates to an air-cooled internal combustion engine with a soundproofing enclosure and a crankshaftdriven cooling-air blower.
  • the object of the present invention to provide an internal combustion engine of the type hereabove described, ensuring both adequate soundproofing and substantially improved cooling conditions.
  • the whole of the cooling air supplied by the blower is directed inside a cavity defined by the outer surface of the engine and the soundproofing enclosure into a distributing chamber and from there in separate branch currents over the cylinder cooling areas and the other components of the engine requiring cooling.
  • the air supply of branch currents leading to points of lesser thermal stress can be throttled as required so that the amount of cooling air delivered by the blower will have to be increased to the absolutely necessary extent only, thereby keeping blower power requirements strictly within economical limits.
  • the cooling-air blower is mounted on the front or rear end of the machine in a laterally offset position, the distributing chamber adjoining the blower and extending alongside one sidewall of the crankcase, separate cooling-air ducts extending from the distributing chamber and leading to the cooling areas of the cylinder and cylinder heads, to the valve chamber housing and to the opposite sidewall of the crankcase, so as to provide adequate cooling for the crankcase wall adjoining the distributing chamber and through the connection to the opposite side of the engine also for the other crankcase wall in addition to the effective cooling of the cylinder and cylinder head areas of the engine.
  • baffles can be installed in the distributing chamber in a manner known per se.
  • crankcase covers also the bottom of the crankcase and/or the oil sump, and the intervening space between the bottom of the crankcase or the oil sump and the enclosure defines and air passage leading form the distributing chamber to the opposite sidewall of the crankcase.
  • the oil sump located below the crankcase is particularly included in the aircooling system, as a result of which the oil temperature is lowered considerably.
  • the cooling air is preferably directed from an inlet provided at the blower end of the engine alongside the walls of the crankcase to the suction end of the blower, and from the delivery end of the blower to the distributing chamber above, from where one cooling-air duct each branches off to the cooling area of the cylinder and of the cylinder headand to the valve chamber housing above.
  • a soundabsorbing housing placed in front of same.
  • This housing may be included in the soundproofing enclosure of the engine or attached to it as a separate unit, provided the sound-absorbing section inside the housing does not fall short of a certain minimum length because sound-attenuation inside such a duct depends on its length, and further provided that the walls of these ducts are not of a sound-projecting nature such as are portions of the engine surface, for example.
  • the width of the duct should not exceed the maximum required to ensure adequate sound-attenuation, and deflecting means should be provided in the housing in order to prevent the direct passage of high-frequency noise.
  • auxiliary machines such as the fuel-injection pump, dynamo, and the like, can be arranged in the cooling-air current inside the cavity defined by the engine surface and the enclosure.
  • sound radiation from these auxiliary machines is blocked by the soundproofing enclosure and at the same time, the temperature of these machines is not allowed to rise unduly.
  • FIG. 3 a part-sectioned side elevation of the internal combustion engine illustrated in FIGS. 1 and 2.
  • FIGS. 4 and 5 show another embodiment of the invention
  • FIG. 4 being a part-sectional view of the internal combustion engine on line IV-IV of FIG. 5, and
  • FIG. 5 a sectional view corresponding to FIG. 3.
  • FIGS. 4a and 5a show part-sectional views of the flywheel end of a variant of the internal combustion engine illustrated in FIG. 4 and FIG. 5, respectively.
  • FIG. 6 is a part-sectioned side elevation of an air-cooled single-cylinder internal combustion engine according to the in- -vention.
  • FIG. 7 shows a horizontal section of this engine on line VII-VII of FIG. 6.
  • the internal combustion engine illustrated in FIGS. 1 to 3 comprises a soundproofing enclosure consisting essentially of the casings 1 and 2 located at the two sides of the engine, with a cowling 4 arranged below the oil sump 3 and another cowling 6 topping the valve chamber housing 5.
  • the enclosure members 1, 2, 4 and 6 are attached to the corresponding wall areas of the internal combustion engine with the interposition of soundproofing spacers 7.
  • the enclosure members are usually made from sheet steel, heat-resistant synthetic products and occasionally from multilayer sheets (sandwich sheets).
  • the aforesaid enclosure members define an essentially coherent cavity sealed off from the outside.
  • an axial flow blower 11 is provided which is laterally offset in relation to the longitudinal central plane of the engine and whose suction stub 12 is attached to the soundproofing enclosure at a front end aperture of same.
  • the blower 1 1 is driven from the crankshaft ofthe engine by means ofa V-belt 13.
  • the blower 11 is preceded by a suction housing 15 whose inner surface is providedwith a sound-absorbing coating 16, and which, as appears in particular from FIG. 3, is provided with a deep-seated inlet 17.
  • a suction housing 15 On the opposite side of the internal combustion engine an air-exhaust housing 18 is located, the inner surface of which is also lined with a sound-absorbing coating 16.
  • a partition 19 of an approximately T-shaped cross section provided with a sound-absorbing coating divides the air exhaust housing 18 into two symmetrical air-outlet conduits 20, each comprising two deflections and terminating in an outlet 21.
  • the cooling air entering the suction housing 15 through the inlet l7 is twice deflected and then arrives at the blower 11 from where it passes into the adjoining distributing chamber '2 defined by the enclosure member or casing 1 and the adiace .l lateral surface of the engine.
  • Another branch current is directed between one sidewall 26 ofthe crankcase 8 and the casing l downwards and enters the intervening space between the oil sump 3 and its cowling 4 through a gap 27.
  • this cooling-air current first sweeps over the sidewall 26. then over the surface of the oil sump 3 and finally in an up-current also over the opposite sidewall 28 ofthe crankcase and the fuel-injection pump 29 ofthe internal combustion engine located between the sidewall 28 and the casing 2.
  • this branch current also passes into the open via the air-exhaust housing 18.
  • the starter 31 located within the enclosure in the distributing chamber 22 also comes into contact with cooling-air.
  • the soundproofing enclosure ends at the connecting flange of theoil sump 3 on the crankcase 8;
  • a connecting passage 32 extending transversely over the bottom of the suction housing 15 is provided as shown in FIGS. 4 and 5. This passage communicates via apertures 33 and 34 with the distributing chamber 22 on the one hand, and with the opposite space defined by the casing 2 and the sidewall of the internal combustion engine, on the other hand.
  • a connecting passage 32 is provided at the flywheel end of the casings 1 and 2 and communicates through apertures 33' and 34' with the aforementioned air-carrying spaces.
  • the arrows in the drawings indicate the flow of cooling air within the visible portion of the enclosure.
  • the air-cooled single-cylinder internal combustion engine shown in FIGS. 6 and 7 comprises a cooling-air blower 35 located at the end of the crankshaft.
  • the crankcase 36 together with the cooling-air blower 35 is surrounded by a multiple-part soundproofing enclosure 37 which in the embodiments of the invention referred to above is attached to the internal combustion engine with the interposition of spacers 7.
  • Through two inlets 38 arranged symmetrically at the front end of the engine the cooling air first enters a downward passage 39 lined with a sound-absorbing coating and designed as a suction housing and, sweeping alongside the walls of the crankcase 36, arrives at the blower 35.
  • a distributing chamber 22 above which is defined by the cylinder 40 together with the cylinder head 41 and an upper casing 42 surrounding these component parts of the engine.
  • each cooling-air branch current each is directed over the cooling areas of the cylinder 40 and ofthe cylinder head 41.
  • Another branch current passes through throttle apertures 43 into the valve chamber 45 covered by a cowling 44 and from there within a downward passage 47 defined by a vertical partition 46 to the fuel-injection pump 48.
  • a gap 49 provided in the partition 46 this branch current of the cooling air rejoins the other branch currents directed downwards in the intervening space between the partition46 and the cylinder 40 and the entire exhaust air is evacuated into the open via an exhaust-air housing 50 mounted on the side of the cylinder and lined with a sound-absorbing coating 51, after having been deflected once, through an outlet 52.
  • a common feature of all embodiments of the invention hereabove described is the splitting up of the cooling-air current into a number of parallel branch currents the flow velocities and cross sections of which vary according to the coolingair requirements of the various component parts of the engine.
  • This basic principle is obviously applicable to a number of different types of internal combustion engines.
  • An air-cooled, soundproof internal combustion engine comprising a cooling-air blower driven by a crankshaft, with cooling surfaces on the cylinders and cylinder heads of the engine, a valve chamber housing to be cooled and defining the upper end of the engine and a crankcase with outer surfaces to be cooled, an engine-soundproofing encasing encompassing the outer surfaces of the engine and providing a cavity therewith, a first sound-absorbing coated housing built into the encasing of the engine and including an inlet for the cooling air, a second sound-absorbing coated housing built into the encasing of the engine and including an outlet for the cooling air, a distributing chamber, the entire cooling air supplied by the said blower being directed through the said cooling-air inlet into the said distributing chamber and from there in separate part currents over the said cylinder and cylinder head cooling surfaces and further elements of the engine requiring cooling, said valve chamber housing being located above the cylinder head of the engine, said cooling-air blower being laterally offset at the front end of the engine between said sound-absorbing coated
  • An air-cooled internal combustion engine comprising an oil sump defining a lower border wall of the said crankcase, the said soundproofing encasing covering also the said oil sump, a clearance between the said encasing and the said oil sump defining the said third cooling-air duct from the distributing chamber to the opposite sidewall of the crankcase.
  • An air-cooled internal combustion engine comprising a connecting duct arranged inside the said .encasing in transverse relation on the crankcase sidewall closest to the said cooling-air blower and below the said cooling-air blower and defining the said third cooling-air duct from the distributing chamber to the opposite sidewall of the crankcase.
  • An air-cooled internal combustion engine comprising a connecting duct inside the said encasing and arranged in transverse relation on the front end of the crankcase facing away from the said cooling-air blower and defining the said third cooling-air duct from the distributing chamber to the opposite sidewall of the crankcase.
  • An air-cooled, soundproof internal combustion engine comprising a cooling-air blower driven by a crankshaft, with cooling surfaces on the cylinders and cylinder heads of the engine, a valve chamber housing to be cooled and defining the upper end of the engine and a crankcase with outer surfaces to be cooled, and engine-soundproofing encasing encompassing the outer surfaces of the engine and providing a cavity therewith, a first sound-absorbing coated housing built into he encasing of the engine and including in inlet for the cooling air, a secondv sound-absorbing coated housing built into the casing of the engine and including an outlet for the cooling air, a distributing chamber, the entire cooling air supplied by said blower being directed through said cooling-air inlet into said distributing chamber and from there in separate part currents over said cylinder and cylinder head cooling surfaces and further elements of the engine requiring cooling, said coolingair blower being arranged at one extremity of said crankshaft, said sound-absorbing coated housing including said coolingair inlet located on the front end of the engine opposite said cooling-

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
US824899A 1968-06-06 1969-05-15 Air-cooled internal combustion engine with soundproofing enclosure Expired - Lifetime US3601101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT543368A AT298164B (de) 1968-06-06 1968-06-06 Luftgekühlte Brennkraftmaschine

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US3601101A true US3601101A (en) 1971-08-24

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US824899A Expired - Lifetime US3601101A (en) 1968-06-06 1969-05-15 Air-cooled internal combustion engine with soundproofing enclosure

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US (1) US3601101A (US20020125480A1-20020912-P00900.png)
JP (1) JPS5124642B1 (US20020125480A1-20020912-P00900.png)
AT (1) AT298164B (US20020125480A1-20020912-P00900.png)
FR (1) FR2010294A1 (US20020125480A1-20020912-P00900.png)
GB (1) GB1263979A (US20020125480A1-20020912-P00900.png)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762497A (en) * 1971-04-22 1973-10-02 Hatz Motoren Air cooled internal combustion engine with noise reducing means
US3796280A (en) * 1971-09-03 1974-03-12 List H Internal combustion engine with sound-proofing casing
JPS49119033A (US20020125480A1-20020912-P00900.png) * 1973-03-06 1974-11-14
US3857453A (en) * 1974-02-21 1974-12-31 Caterpillar Tractor Co Noise suppression means for tractors
US3859965A (en) * 1972-05-08 1975-01-14 Hatz Motoren Internal combustion engine with silencing means
US3863617A (en) * 1972-11-10 1975-02-04 List Hans Internal combustion engine with sound-proof v-belt pulley
JPS5083433U (US20020125480A1-20020912-P00900.png) * 1973-12-06 1975-07-17
US3926155A (en) * 1972-05-08 1975-12-16 Hatz Motoren Internal combustion engine with silencing means
US3949727A (en) * 1974-05-20 1976-04-13 Hans List Carburetor engine with sound-proof encasing
US3964462A (en) * 1974-12-10 1976-06-22 Hans List Sound-proofed internal combustion engine
US3991735A (en) * 1974-11-26 1976-11-16 International Harvester Company Internal combustion engine
US4126115A (en) * 1976-09-17 1978-11-21 Hans List Internal combustion engine
USRE29923E (en) * 1974-05-20 1979-03-06 Hans List Sound-proofed internal combustion engine
US4226217A (en) * 1977-09-10 1980-10-07 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with sound-insulating capsule and water radiator arranged outside the capsule
US4993381A (en) * 1988-09-15 1991-02-19 Motorenfabrik Hatz Gmbh & Co. Kg Internal combustion engine having a sound-damping casing
US10557402B2 (en) * 2013-03-15 2020-02-11 Kohler Co. Noise suppression systems

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2222556C3 (de) * 1972-05-08 1984-08-23 Motorenfabrik Hatz Gmbh & Co Kg, 8399 Ruhstorf Luftgekühlte Brennkraftmaschine mit Geräuschdämpfung
DE2265214C3 (de) * 1972-05-08 1984-05-24 Motorenfabrik Hatz Gmbh & Co Kg, 8399 Ruhstorf Luftgekühlte Brennkraftmaschine mit schallgedämpften Luftwegen
JPS5345941U (US20020125480A1-20020912-P00900.png) * 1976-09-22 1978-04-19
JPS5349553U (US20020125480A1-20020912-P00900.png) * 1976-09-30 1978-04-26
DE3410976A1 (de) * 1983-03-18 1984-10-04 Honda Giken Kogyo K.K., Tokio/Tokyo Vollstaendig abgekapselter, tragbarer generator
GB2141782B (en) * 1983-05-11 1987-01-07 Honda Motor Co Ltd Portable engine-generator sets
IT8322002V0 (it) * 1983-05-31 1983-05-31 Same Spa Gruppo motore a combustione interna con impianto di ventilazione di pompe iniezione.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR533682A (fr) * 1921-04-01 1922-03-08 Perfectionnements aux moteurs à explosions à refroidissement par air
US1560121A (en) * 1922-06-05 1925-11-03 Trewhella William Air-cooling device for engines
GB567567A (en) * 1943-11-19 1945-02-20 Bolinder Munktell Improvements in or relating to internal combustion engines
GB782078A (en) * 1954-06-12 1957-08-28 Vladimir Popelar A device for the temperature control in air-cooled internal combustion engines
US2893361A (en) * 1957-04-15 1959-07-07 American Motors Corp Engine shroud

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR533682A (fr) * 1921-04-01 1922-03-08 Perfectionnements aux moteurs à explosions à refroidissement par air
US1560121A (en) * 1922-06-05 1925-11-03 Trewhella William Air-cooling device for engines
GB567567A (en) * 1943-11-19 1945-02-20 Bolinder Munktell Improvements in or relating to internal combustion engines
GB782078A (en) * 1954-06-12 1957-08-28 Vladimir Popelar A device for the temperature control in air-cooled internal combustion engines
US2893361A (en) * 1957-04-15 1959-07-07 American Motors Corp Engine shroud

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762497A (en) * 1971-04-22 1973-10-02 Hatz Motoren Air cooled internal combustion engine with noise reducing means
US3796280A (en) * 1971-09-03 1974-03-12 List H Internal combustion engine with sound-proofing casing
US3859965A (en) * 1972-05-08 1975-01-14 Hatz Motoren Internal combustion engine with silencing means
US3926155A (en) * 1972-05-08 1975-12-16 Hatz Motoren Internal combustion engine with silencing means
US3863617A (en) * 1972-11-10 1975-02-04 List Hans Internal combustion engine with sound-proof v-belt pulley
JPS5641807B2 (US20020125480A1-20020912-P00900.png) * 1973-03-06 1981-09-30
JPS49119033A (US20020125480A1-20020912-P00900.png) * 1973-03-06 1974-11-14
JPS5083433U (US20020125480A1-20020912-P00900.png) * 1973-12-06 1975-07-17
US3857453A (en) * 1974-02-21 1974-12-31 Caterpillar Tractor Co Noise suppression means for tractors
US3949727A (en) * 1974-05-20 1976-04-13 Hans List Carburetor engine with sound-proof encasing
USRE29923E (en) * 1974-05-20 1979-03-06 Hans List Sound-proofed internal combustion engine
US3991735A (en) * 1974-11-26 1976-11-16 International Harvester Company Internal combustion engine
US3964462A (en) * 1974-12-10 1976-06-22 Hans List Sound-proofed internal combustion engine
US4126115A (en) * 1976-09-17 1978-11-21 Hans List Internal combustion engine
US4226217A (en) * 1977-09-10 1980-10-07 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with sound-insulating capsule and water radiator arranged outside the capsule
US4993381A (en) * 1988-09-15 1991-02-19 Motorenfabrik Hatz Gmbh & Co. Kg Internal combustion engine having a sound-damping casing
US10557402B2 (en) * 2013-03-15 2020-02-11 Kohler Co. Noise suppression systems

Also Published As

Publication number Publication date
AT298164B (de) 1972-04-25
GB1263979A (en) 1972-02-16
FR2010294A1 (US20020125480A1-20020912-P00900.png) 1970-02-13
JPS5124642B1 (US20020125480A1-20020912-P00900.png) 1976-07-26

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