US3530840A - Soundproof internal combustion engines - Google Patents

Soundproof internal combustion engines Download PDF

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Publication number
US3530840A
US3530840A US697896A US3530840DA US3530840A US 3530840 A US3530840 A US 3530840A US 697896 A US697896 A US 697896A US 3530840D A US3530840D A US 3530840DA US 3530840 A US3530840 A US 3530840A
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United States
Prior art keywords
shell
internal combustion
air
engine
cooling
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Expired - Lifetime
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US697896A
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English (en)
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Fritz Freyn
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Individual
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Individual
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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
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation

Definitions

  • An internal Combustion engine having a soundproofing enclosure and a cooling air blower with the enclosure consisting of at least two shells enclosing the engine in spaced relationship thereto Continuous soundproofing packing strips are provided which are of an elastic material and extending along the bearing surfaces of the shells with bolts interconnecting the shells and air ducts provided in a cavity between the shells and the outer surfaces of the cylinder block so that the entire cooling air will be directed over the outer surface of the cylinder block.
  • Some types of internal combustion engines are known to be soundproofed by means of a sound-absorbing coating applied to the outside of the crankcase.
  • the operations to be performed for that purpose calling for a special treatment of the outer surface of the crankcase prior to the application of these coatings in order to ensure their proper adhesion and certain precautions to be taken to prevent the coating material from penetrating into the oil and water containers of the cylinder block, are both time-consuming and expensive.
  • the sound-absorbing coating which must also comprise heat and oil-resistant materials, impairs heat abduction from the walls of the crankcase, thereby causing a considerable rise of the motor oil temperature. Consequently, the oil coolers must be oflarger dimensions.
  • crankcases are difficult to manufacture and therefore, expensive.
  • the invention offers a considerable advantage .from the viewpoint of manufacture inasmuch as the elements of the shell construction can be made in serial production in a simple manner at low cost and readily mounted on the finished engines. Another advantage resides in the possibility of equipping existing standard types of not yet soundproofed internal combustion engines with the soundproofing shell construction according to the invention without major structural alterations.
  • the shell is not called upon to carry or support any other members. and since its component parts are bound to be reinforced in view of their necessarily arcuate design, the shell may be of comparatively minor wall thickness ,andweight.
  • the shell body preferably comprises at least two sections interconnected by means of bolts and attachable to the cylinder block.
  • This design offers the advantage of facilitating the assembly of ,the shell which in the embodiment of the invention shown by way of example consists of two halves provided with a number of aligned bolt bushes, since when the shell halves are bolted together the same are simultaneously secured to the cylinder block.
  • the shell sections attachable to the cylinder block carry sound-absorbing seats, such as sealing ledges of rubber or the like, on their contact surfaces with the cylinder block.
  • These seats not only provide additional damping elements still further reducing the transmission of sounds to the shell to a considerable extent, but also serve to level any unevenness of the external surface of the engine used as a support for sections of the shell, so that these contact surfaces will not have to be especially machined.
  • the elastic support of the shell by means of these sealing ledges offers the additional advantage of permitting the suppression of natural vibrations and resonance phenomena produced by the shell proper.
  • a preferred field of application of this invention are blowercooled internal combustion engines, wherein according to the invention the entire cooling air delivered by the cooling-air blower is directed within the cavity defined by the cylinder block and the shell over the oil-coated walls of the engine and over such additional members of the engine as may require cooling.
  • This makes for particularly efficient cooling of the oil-coated engine walls as a result of which the oil temperature is reduced to such a degree that in certain cases, the conventional oil cooler may be dispensed with.
  • this arrangement offers the possibility, for the first time, to direct cooling air also to such elements of the engine as usually remain uncooled, such as for example, the rocker box.
  • improved cooling of the engine also makes for increased operational safety.
  • the feature of the invention hereabove described is also applicable to water-cooled engines where increased cooling of the cylinder block appears to be desirable.
  • the required cooling air current can be produced either by means of the existing fan associated with the water cooling system or by a separate cooling-air blower.
  • a particularly simple structural arrangement consists in partitioning the cavity between the cylinder block and the shell by means of sealing strips of an elastic material, such as rubber, attached to the shell and adjoining the cylinder block, so as to provide at least two separate air shafts for the conveyance of the air delivered to and discharged by, the cooling-air blower.
  • these sealing ledges may extend alongside the upper connecting flange of the crankcase, that is approximately at mid-level of the internal combustion engine, so as to contribute to the reinforcement of the shell. Since the elasticity of these sealing ledges levels any existing unevenness of the en gine surface out, the surfaces of these sealing strips in contact with the engine will not require special machining.
  • the fuel injection pump in a place of the cavity which is exposed to at least part of the cooling-air current.
  • the fuel injection pump is subject to intensive cooling, particularly if the port through which cooling air is admitted to the cavity of the shell is located in its immediate proximity, thereby positively precluding the formation of steam bubbles as occurs frequently particularly in tropical regions.
  • the inner surface of the shell of relatively noisy engines is preferably at least partly provided with a sound-absorbing coating.
  • the sound-proofing of internal combustion engines thus achieved is of superior efficiency as compared with many conventional soundproofing methods.
  • this coating will only be applied in the area of highly sound-radiating engine parts, such as particularly in the area of the cylinders and cylinder-heads of air-cooled internal combustion engines.
  • HO. 1 shows a side elevation partly in section of an aircooled single-cylinder internal combustion engine according to the invention
  • FIG. 2 a front view of the internal combustion engine according to FIG. I, both figures representing schematically simplified illustrations;
  • FIG. 3 is a partial side elevation partly in section of another embodiment of the invention as applied to an air-cooled internal combustion engine
  • FIGS. 4 and 5 being partial cross-sectional views of the internal combustion engine shown in FIG. 3 on lines IV-IV and V-V respectively, of FIG. 3;
  • FIGS. 6 and 7 are horizontal cross-sectional views on lines VI-VI and VII-VII respectively, of FIG. 3;
  • FIG. 8 shows a detail of the internal combustion engine according to FIG. 3 on line VIII-VIII of FIG. 3.
  • the air-cooled single-cylinder internal combustion engine illustrated in FIGS. 1 and 2 features a sound-proofing shell comprising two halves l and 2, the parting line 3 of which is located in the longitudinal central plane of the engine including the cylinder axis.
  • the halves l and 2 of the shell which are made of plastic material for example, comprise bolt bushes 4 aligned in pairs.
  • the two halves l and 2 of the shell are interconnected by means of bolts 5 extending through the bolt bushes 4.
  • the shell is secured to the internal combustion engine by means of a compression joint produced simultaneously with the screwing together of the two halves 1 .and 2 of the shell.
  • the halves l and 2 are provided with sound-absorbing sealing strips 6 to 9 of elastic material, such as rubber or the like, on their contact surfaces with the crankcase of the internal combustion engine.
  • these sealing strips are pressed on to the corresponding counter-surface of the internal combustion engine in such a manner as to provide both a seal and a means of leveling out any unevenness of the contact surfaces.
  • sound radiation from the engine towards the elements of the shell is considerably reduced.
  • the sealing strips also attenuate occasional natural vibrations of the halves l and 2 of the shell.
  • the sealing strips 6 of the two halves 1 and 2 of the shell comprise the front end crankshaft flange 11, whereas the sealing strips 7 adjoin the flywheel flange 12 of the engine with a contact pressure extending in the direction of the crankshaft axis.
  • the sealing ledges 8 rest on the crankcase 13 in the immediate vicinity of the cylinder 14 of the internal combustion engine.
  • the sealing strips 9 adjoin the longitudinal edges of the cylinder-connecting flange of the crankcase l3 and partition the cavity defined by the shell and the internal combustion engine so as to produce an upper and a lower air shaft 15 and 16, respectively, for the air intake and exhaust.
  • Another shell member designed as a lid 17 and comprising the upper portion of the cylinder head 10, is detachably secured to the top of the two halves l and 2 of the shell. This arrangement provides easy access to the cylinder head for the performance of various operations such as adjustments.
  • the halves l and 2 of the shell present recesses which are open in the direction of the joint 3 and jointly defining the suction port 19 for the cooling air drawn in by the cooling blower 20 of the internal combustion engine (indicated by a dotted line in H6. 1), the cooling air admitted through port 19 being directed as indicated by an arrow over and above the fuel-injection pump 2] located directly behind the suction port 19 in two descending branch currents through the lower air shaft 15 over the sidewalls of the crankcase 13 to the blower 20.
  • the inner surface of the air baffle box 24 as well as the surface of the partition 22 facing the cylinder 14 of the internal combustion engine are provided with a sound-proofing coating 26.
  • this coating 26 serves primarily for the attenuation of the noise made by the incoming and outflowing blower air.
  • the internal combustion engine illustrated in FIGS. 3 to 8 is of the same design as the engine shown in FIGS. 1 and 2.
  • the shell comprises two halves l and 2' pro- 1 vided with bolt bushes 4' but open towards the front end of the engine facing away from the flywheel flange l2 and carrying a front end sealing strip 27.
  • a perforated shell lid 28 resting on the sealing ledge 27 is mounted, with the interposition of a gasket 6', on the cover 10 of the engine secured to the crankshaft flange 11' by means of special bolts 34 which are threaded and provided with a central hexagon head 35.
  • the lid 28 of the shell is provided with bores for the passage of the threaded extremities of the bolts 34 and clamped in the direction of the crankshaft flange 11' by means of nuts 36 screwed on to the bolts 34 with the interposition of rubber rings 33.
  • An internal combustion engine comprising a soundproofing enclosure and a cooling-air blower, the said enclosure consisting of at least two arcuate shell members elastically resting on a cylinder block of the engine and encompassing the same in spaced relation thereto, the said shell members adjoining each other alongside a common joint and comprising bolt bushes aligned in pairs in the area of the said joint, bolts extending through the said bolt bushes and interconnecting the said shell members and connecting the same with the cylinder block, a first group of sound-absorbing sealing strips of an elastic material arranged between the said shell members and their supports on the cylinder block and clamped between these elements by the prestressing force of the said bolts, an air inlet and an air outlet in the said enclosure, 21 second group of sealing strips of an elastic material secured to the inner surface of the said shell members and adjoining the outer surface of the said cylinder block, the sealing strips of the said second I

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Exhaust Silencers (AREA)
US697896A 1967-02-14 1968-01-15 Soundproof internal combustion engines Expired - Lifetime US3530840A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT145167A AT281502B (de) 1967-02-14 1967-02-14 Brennkraftmaschine mit schallisolierender Verkleidung

Publications (1)

Publication Number Publication Date
US3530840A true US3530840A (en) 1970-09-29

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US697896A Expired - Lifetime US3530840A (en) 1967-02-14 1968-01-15 Soundproof internal combustion engines

Country Status (4)

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US (1) US3530840A (de)
AT (1) AT281502B (de)
DE (1) DE1576775C3 (de)
FR (1) FR1556494A (de)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684053A (en) * 1970-09-02 1972-08-15 List Hans Internal combustion engine with sound-absorbing casing
US3685613A (en) * 1970-05-12 1972-08-22 Victa Ltd Mufflers for internal combustion engines
US3693602A (en) * 1969-09-17 1972-09-26 List Hans Internal combustion engine with sound-proofing casing
US3695386A (en) * 1969-03-20 1972-10-03 List Hans Sound-proofing component
US3762497A (en) * 1971-04-22 1973-10-02 Hatz Motoren Air cooled internal combustion engine with noise reducing means
US3791482A (en) * 1973-05-14 1974-02-12 Coleman Co Noise supression air duct assembly for air cooled internal combustion engines in vehicle installations
US3863617A (en) * 1972-11-10 1975-02-04 List Hans Internal combustion engine with sound-proof v-belt pulley
US3911876A (en) * 1973-03-06 1975-10-14 List Hans Air-cooled single-cylinder internal combustion engine
JPS5113439U (de) * 1974-07-18 1976-01-31
US3964462A (en) * 1974-12-10 1976-06-22 Hans List Sound-proofed internal combustion engine
US3993030A (en) * 1974-08-06 1976-11-23 Ateliers De La Motobecane Injector support for direct injection engines
US4124011A (en) * 1977-04-21 1978-11-07 Toyota Jidosha Kogyo Kabushiki Kaisha System for preventing outflow of oil from an oil filler port
USRE29923E (en) * 1974-05-20 1979-03-06 Hans List Sound-proofed internal combustion engine
US4146112A (en) * 1977-10-31 1979-03-27 General Electric Company Sound reducing baffle for electrical apparatus
US4207085A (en) * 1978-11-16 1980-06-10 Ford Motor Company Air cleaner air expansion chamber construction
US4289096A (en) * 1979-07-02 1981-09-15 Deere & Company Accoustic noise suppression apparatus noise suppression means
US4890583A (en) * 1987-12-28 1990-01-02 Fuji Jukogyo Kabushiki Kaisha Crankcase of an engine
FR2636372A1 (fr) * 1988-09-15 1990-03-16 Hatz Motoren Moteur a combustion interne
US6044811A (en) * 1997-02-14 2000-04-04 Mitsubishi Heavy Industries, Ltd. Air guide casing for air-cooled engine
US20080053746A1 (en) * 2006-08-30 2008-03-06 Albert Roger W Noise reduction shroud
US20140271134A1 (en) * 2013-03-15 2014-09-18 Kohler Co. Noise suppression systems
US20160319844A1 (en) * 2013-03-15 2016-11-03 Kohler Co. Noise suppression system
EP2546504B1 (de) 2011-07-14 2018-10-03 MAHLE International GmbH Brennkraftmaschine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2159158C3 (de) * 1971-11-29 1983-12-08 Motorenfabrik Hatz Gmbh & Co Kg, 8399 Ruhstorf Brennkraftmaschine mit am Maschinengehäuse mit Abstand angebrachten schalldämpfenden Vorsatzschalen
DE3639218A1 (de) 1986-11-15 1988-05-26 Karl Joh Gummiwarenfab Ventildeckel fuer den zylinderkopf eines verbrennungsmotors
DE3719266A1 (de) * 1987-06-10 1988-12-29 Kloeckner Humboldt Deutz Ag Schallgekapselte, luftgekuehlte brennkraftmaschine

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695386A (en) * 1969-03-20 1972-10-03 List Hans Sound-proofing component
US3693602A (en) * 1969-09-17 1972-09-26 List Hans Internal combustion engine with sound-proofing casing
US3685613A (en) * 1970-05-12 1972-08-22 Victa Ltd Mufflers for internal combustion engines
US3684053A (en) * 1970-09-02 1972-08-15 List Hans Internal combustion engine with sound-absorbing casing
US3762497A (en) * 1971-04-22 1973-10-02 Hatz Motoren Air cooled internal combustion engine with noise reducing means
US3863617A (en) * 1972-11-10 1975-02-04 List Hans Internal combustion engine with sound-proof v-belt pulley
US3911876A (en) * 1973-03-06 1975-10-14 List Hans Air-cooled single-cylinder internal combustion engine
US3791482A (en) * 1973-05-14 1974-02-12 Coleman Co Noise supression air duct assembly for air cooled internal combustion engines in vehicle installations
USRE29923E (en) * 1974-05-20 1979-03-06 Hans List Sound-proofed internal combustion engine
JPS5113439U (de) * 1974-07-18 1976-01-31
US3993030A (en) * 1974-08-06 1976-11-23 Ateliers De La Motobecane Injector support for direct injection engines
US3964462A (en) * 1974-12-10 1976-06-22 Hans List Sound-proofed internal combustion engine
US4124011A (en) * 1977-04-21 1978-11-07 Toyota Jidosha Kogyo Kabushiki Kaisha System for preventing outflow of oil from an oil filler port
US4146112A (en) * 1977-10-31 1979-03-27 General Electric Company Sound reducing baffle for electrical apparatus
US4207085A (en) * 1978-11-16 1980-06-10 Ford Motor Company Air cleaner air expansion chamber construction
US4289096A (en) * 1979-07-02 1981-09-15 Deere & Company Accoustic noise suppression apparatus noise suppression means
US4890583A (en) * 1987-12-28 1990-01-02 Fuji Jukogyo Kabushiki Kaisha Crankcase of an engine
FR2636372A1 (fr) * 1988-09-15 1990-03-16 Hatz Motoren Moteur a combustion interne
GB2222853A (en) * 1988-09-15 1990-03-21 Hatz Motoren An I.C. engine having a sound-damping casing
US4993381A (en) * 1988-09-15 1991-02-19 Motorenfabrik Hatz Gmbh & Co. Kg Internal combustion engine having a sound-damping casing
GB2222853B (en) * 1988-09-15 1992-12-23 Hatz Motoren An internal combustion engine having a sound-damping casing
US6044811A (en) * 1997-02-14 2000-04-04 Mitsubishi Heavy Industries, Ltd. Air guide casing for air-cooled engine
US20080053746A1 (en) * 2006-08-30 2008-03-06 Albert Roger W Noise reduction shroud
EP2546504B1 (de) 2011-07-14 2018-10-03 MAHLE International GmbH Brennkraftmaschine
US20140271134A1 (en) * 2013-03-15 2014-09-18 Kohler Co. Noise suppression systems
US20160319844A1 (en) * 2013-03-15 2016-11-03 Kohler Co. Noise suppression system
US9752494B2 (en) * 2013-03-15 2017-09-05 Kohler Co. Noise suppression systems
US9797412B2 (en) * 2013-03-15 2017-10-24 Kohler Co. Noise suppression system
US10077707B2 (en) 2013-03-15 2018-09-18 Kohler Co. Noise suppression systems
US10557402B2 (en) * 2013-03-15 2020-02-11 Kohler Co. Noise suppression systems

Also Published As

Publication number Publication date
FR1556494A (de) 1969-02-07
DE1576775A1 (de) 1970-03-19
AT281502B (de) 1970-05-25
DE1576775B2 (de) 1973-08-30
DE1576775C3 (de) 1974-03-28

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