US3773142A - Noise-isolated rocker arm cover - Google Patents

Noise-isolated rocker arm cover Download PDF

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Publication number
US3773142A
US3773142A US00294255A US3773142DA US3773142A US 3773142 A US3773142 A US 3773142A US 00294255 A US00294255 A US 00294255A US 3773142D A US3773142D A US 3773142DA US 3773142 A US3773142 A US 3773142A
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United States
Prior art keywords
cover
gasket
engine
bonded
pad means
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Expired - Lifetime
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US00294255A
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G Bragg
N Jones
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Caterpillar Inc
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Caterpillar Tractor Co
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Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • 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 object of this invention is to provide a cover assembly attached to an engine for substantially isolating vibrational energy during engine operation.
  • the cover assembly comprises a cover having a peripheral flange formed therearound, an underlying elastomeric pad, exhibiting high vibrational energy loss properties, bonded to the flange, an underlying rigid member bonded to the pad and an elastomeric gasket compressed between the member and the engine to form a static seal thereat.
  • the drawing is a transverse, cross sectional view of a noise-isolated rocker arm assembly attached to an engine.
  • a cover which may constitute die-cast aluminum or the like, comprises vertical sidewalls 12 and a top wall 13.
  • the top wall preferably forms an inverted V- shape to define a longitudinally extending ridge 14 on the cover assembly.
  • a peripheral flange 15 extends transversely from the sidewalls and circumvents the cover assembly.
  • An elastomeric pad means 16 exhibiting high vibrational energy absorption and loss properties, underlies and is bonded to the flange by a suitable bonding agent.
  • the plastic or rubber pad means may comprise a continuous strip of elastomeric material, such as 40 to 60 durometer nitrile rubber having a thickness of from oneeighth to one-fourth of. an inch.
  • the elastomeric properties of the pad means are preferably tailored to provide a spring rate for tuning the natural frequency of the isolated cover away from the natural exciting frequency emanating from the moving parts of the engine.
  • the amplitude of the cover vibrations will be dampened by absorbing vibrational energy in the hysteresis of the pad means, resulting in enhanced damping and minimal noise transmittal.
  • a rigid member 17 underlies and is bonded to the pad means by a suitable bonding agent.
  • the member preferably comprises an inverted U-shaped channel having vertically disposed-and parallel inner and outer legs 18 and 19, respectively, defining a. continuous channel 20 having a continuous elastomeric gasket 21 disposed therein.
  • Cut-outs 23 are formed through flange 15 and pad means 16 to accommodate the head of each cap screw therein.
  • the predetermined degree of compression imparted to the gasket by the cap screws is precisely achieved by stop means comprising the extremities of legs 18 and 19 which are drawn into abutting engagement with a top planar surface 24 of the engine.
  • An engine having a noise suppressing cover assembly attached thereto, said cover assembly comprising a cover having a peripheral flange formed therearound,
  • elastomeric pad means having high vibrational energy loss properties underlying and bonded to said flange
  • releasable attaching means attaching said cover assembly to said engine, projecting solely through said member and said gasket forcompressing said gasket to form a seal thereat which circumvents said cover.
  • said cover constitutes a rocker arm cover having said top .wall forming an inverted V-shape in transverse cross section to define a longitudinally extending ridge on said cover.
  • said attaching means each comprises a cap screw and further comprising means forming a cut-out through each of said flange and said pad means for accommodating the head of .each of .said cap screws.
  • a noise suppressing cover assembly comprising .a cover having a peripheral flange formed therearound,
  • elastomeric, noise isolating pad means having high vibrational energy loss properties underlying and bonded to said flange,.and
  • said member formingan inverted U-shape cross section to comprise vertically disposed and parallel inner and outer legs defining a continuous channel therearound adapted to receive a gasket therein.
  • said cover constitutes a rocker arm cover having said top wall forming an inverted V-shaped in transverse cross section to define a longitudinally extending ridge on said cover.
  • said pad means constitutes a continuous strip having a durometer hardness approximating about from forty to sixty.
  • An engine having a noise suppressing cover assembly attached thereto, said cover assembly comprising a cover having a peripheral flange formed theretherearound, said gasket disposed in said channel.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

A rocker arm cover has a circumferential flange bonded to an underlying elastomeric pad. The pad is further bonded to an underlying channel member having a gasket disposed therein. Circumferentially disposed cap screws extend through the channel member and gasket to removably attach the integrated cover assembly to the head or block of an internal combustion engine.

Description

Umted States Patent 1191 1111 3,773,142
Bragg et al. [4 1 Nov. 20, 1973 [54] NOISE-ISOLATED ROCKER ARM COVER 2,981,247 4/1961 Gaebler 123 9038 [75] Inventors: Gary 0. Bragg, Dunlap; Nelson A.
Jones Peoria, both f 11 Primary Examiner-Richard B. Wilkinson Assistant Examiner-Vit W. Miska [73] Ass1gnee: Caterpillar Tractor Co., Peoria, Ill. An0mey paul Lempio [22] Filed: Oct. 2, 1972 21 Appl. No.: 294,255 1 71 ABSTRACT A rocker arm cover has a circumferential flange 52 US. Cl. 181/33 K, 123/9038, 123/198 E bonded to an underlying elaswmeric p The p is 51 1111. C1. E04b 1 99, GlOk 11/04 further bonded to an underlying channel member [58] Field of Search 181/33 K; 123/198 E, ing a gasket disposed therein- Cirwmferemially 123/90 38 posed cap screws extend through the channel member and gasket to removably attach the integrated cover 5 References m assembly to the head or block of an internal combus- UNITED STATES PATENTS engme' 3,090,463 5/ 1963 Yanda 181/33 K 12 Claims, 1 Drawing Figure PMENIEDuuvzo 1975 3,773,142
NOISE-ISOLATED ROCKER ARM COVER BACKGROUND OF THE INVENTION Internal combustion engines transmit an appreciable amount of vibrational energy to engine mounted components during engine operation. Since the human ear is highly sensitive to a frequency range of from 800Hz to 3,000Hz, many attempts have been made to isolate or absorb such energy prior to its transmittal to rocker arm covers and the like. For example, British Patent No. 1,218,734 discloses an annular gasket disposed between split portions of a rocker arm cover to attempt to attenuate noise resulting therefrom.
SUMMARY OF THE INVENTION An object of this invention is to provide a cover assembly attached to an engine for substantially isolating vibrational energy during engine operation. The cover assembly comprises a cover having a peripheral flange formed therearound, an underlying elastomeric pad, exhibiting high vibrational energy loss properties, bonded to the flange, an underlying rigid member bonded to the pad and an elastomeric gasket compressed between the member and the engine to form a static seal thereat.
BRIEF DESCRIPTION OF THE DRAWING The drawing is a transverse, cross sectional view of a noise-isolated rocker arm assembly attached to an engine.
DETAILED DESCRIPTION The drawing illustrates a rocker arm cover assembly removably attached to the cylinder head or block of an internal combustion engine 11. The cover assembly completely encloses the rocker arms and attendant mechanisms (not shown) to protect them against damage and to prevent the egress of lubricating oil therefrom. A cover, which may constitute die-cast aluminum or the like, comprises vertical sidewalls 12 and a top wall 13. The top wall preferably forms an inverted V- shape to define a longitudinally extending ridge 14 on the cover assembly.
A peripheral flange 15 extends transversely from the sidewalls and circumvents the cover assembly. An elastomeric pad means 16, exhibiting high vibrational energy absorption and loss properties, underlies and is bonded to the flange by a suitable bonding agent. The plastic or rubber pad means may comprise a continuous strip of elastomeric material, such as 40 to 60 durometer nitrile rubber having a thickness of from oneeighth to one-fourth of. an inch.
The elastomeric properties of the pad means are preferably tailored to provide a spring rate for tuning the natural frequency of the isolated cover away from the natural exciting frequency emanating from the moving parts of the engine. In addition, the amplitude of the cover vibrations will be dampened by absorbing vibrational energy in the hysteresis of the pad means, resulting in enhanced damping and minimal noise transmittal.
A rigid member 17 underlies and is bonded to the pad means by a suitable bonding agent. The member preferably comprises an inverted U-shaped channel having vertically disposed-and parallel inner and outer legs 18 and 19, respectively, defining a. continuous channel 20 having a continuous elastomeric gasket 21 disposed therein. A plurality of attaching means, such as cap screws 22, project through the member and the gasket for compressing the gasket to form a static seal thereat completely around the cover assembly.
Cut-outs 23 are formed through flange 15 and pad means 16 to accommodate the head of each cap screw therein. The predetermined degree of compression imparted to the gasket by the cap screws is precisely achieved by stop means comprising the extremities of legs 18 and 19 which are drawn into abutting engagement with a top planar surface 24 of the engine.
Although the above cover assembly is particularly useful for rocker arm cover applications, it should be understood that the teachings herein can be likewise applied to timing gear covers, oil pans and the like.
What is claimed is:
1. An engine having a noise suppressing cover assembly attached thereto, said cover assembly comprising a cover having a peripheral flange formed therearound,
elastomeric pad means having high vibrational energy loss properties underlying and bonded to said flange,
a rigid member underlying and bonded to said pad means,
an elastomeric gasket disposed between said member and said engine, and
releasable attaching means, attaching said cover assembly to said engine, projecting solely through said member and said gasket forcompressing said gasket to form a seal thereat which circumvents said cover.
2. The invention of claim 1 wherein said cover constitutes a rocker arm cover having said top .wall forming an inverted V-shape in transverse cross section to define a longitudinally extending ridge on said cover.
3. The invention of claim 2 wherein said member forms an inverted U-shape in cross section to comprise vertically disposed and parallel inner and outer legs dey fining a continuous channel therearound, said gasket disposed in said channel.
4. The invention of claim 3 wherein at least one of said legs abuts said engine to provide stop means for imparting a predetermined degree of compression to said gasket.
5. The invention of claim 1 wherein said attaching means each comprises a cap screw and further comprising means forming a cut-out through each of said flange and said pad means for accommodating the head of .each of .said cap screws.
6. The invention of, claim ,1 whereinsaid pad means constitutesa continuous strip having-a durometer hardness approximating about from forty to sixty.
7. A noise suppressing cover assembly comprising .a cover having a peripheral flange formed therearound,
elastomeric, noise isolating pad means having high vibrational energy loss properties underlying and bonded to said flange,.and
a rigid memberunderlying and bonded to said pad means,
said member formingan inverted U-shape cross section to comprise vertically disposed and parallel inner and outer legs defining a continuous channel therearound adapted to receive a gasket therein.
.8. The invention of claim 7 wherein said cover constitutes a rocker arm cover having said top wall forming an inverted V-shaped in transverse cross section to define a longitudinally extending ridge on said cover.
9. The invention of claim 7 wherein said member forms an inverted U-shape cross section to comprise vertically disposed and parallel inner and outer legs defining a continuous channel therearound adapted to receive a gasket therein.
10. The invention of claim 7 furhter comprising means forming a cut-out through each of said flange and said pad means for accommodating the head of an attaching means therein.
11. The invention of claim 8 wherein said pad means constitutes a continuous strip having a durometer hardness approximating about from forty to sixty.
12. An engine having a noise suppressing cover assembly attached thereto, said cover assembly comprising a cover having a peripheral flange formed theretherearound, said gasket disposed in said channel.

Claims (12)

1. An engine having a noise suppressing cover assembly attached thereto, said cover assembly comprising a cover having a peripheral flange formed therearound, elastomeric pad means having high vibrational energy loss properties underlying and bonded to said flange, a rigid member underlying and bonded to said pad means, an elastomeric gasket disposed between said member and said engine, and releasable attaching means, attaching said cover assembly to said engine, projecting solely through said member and said gasket for compressing said gasket to form a seal thereat which circumvents said cover.
2. The invention of claim 1 wherein said cover constitutes a rocker arm cover having said top wall forming an inverted V-shape in transverse cross section to define a longitudinally extending ridge on said cover.
3. The invention of claim 2 wherein said member forms an inverted U-shape in cross section to comprise vertically disposed and parallel inner and outer legs defining a continuous channel therearound, said gasket disposed in said channel.
4. The invention of claim 3 wherein at least one of said legs abuts said engine to provide stop means for imparting a predetermined degree of compression to said gasket.
5. The invention of claim 1 wherein said attaching means each comprises a cap screw and further comprising means forming a cut-out through each of said flange and said pad means for accommodating the head of each of said cap screws.
6. The invention of claim 1 wherein said pad means constitutes a continuous strip having a durometer hardness approximating about from forty to sixty.
7. A noise suppressing cover assembly comprising a cover having a peripheral flange formed therearound, elastomeric, noise isolating pad means having high vibrational energy loss properties underlying and bonded to said flange, and a rigid member underlying and bonded to said pad means, said member forming an inverted U-shape cross section to comprise vertically disposed and parallel inner and outer legs defining a continuous channel therearound adapted to receive a gasket therein.
8. The invention of claim 7 wherein said cover constitutes a rocker arm cover having said top wall forming an inverted V-shaped in transverse cross section to define a longitudinally extending ridge on said cover.
9. The invention of claim 7 wherein said member forms an inverted U-shape cross section to comprise vertically disposed and parallel inner and outer legs defining a continuous channel therearound adapted to receive a gasket therein.
10. The invention of claim 7 furhter comprising means forming a cut-out through each of said flange and said pad means for accommodating the head of an attaching means therein.
11. The invention of claim 8 wherein said pad means constitutes a continuous strip having a durometer hardness approximating about from forty to sixty.
12. An engine having a noise suppressing cover assembly attached thereto, said cover assembly comprising a cover having a peripheral flange formed therearound, elastomeric pad means having high vibrational energy loss properties underlying and bonded to said flange, a rigid member underlying and bonded to said pad means, en elAstomeric gasket disposed between said member and said engine, and releasable attaching means, attaching said cover assembly to said engine, solely projecting through said member and said gasket for compressing said gasket to form a seal thereat which circumvents said cover, said member forming an inverted U-shape in cross section to comprise vertically disposed and parallel inner and outer legs defining a continuous channel therearound, said gasket disposed in said channel.
US00294255A 1972-10-02 1972-10-02 Noise-isolated rocker arm cover Expired - Lifetime US3773142A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019600A (en) * 1975-06-09 1977-04-26 Caterpillar Tractor Co. Anti-noise mounting means for transmissions
US4027644A (en) * 1975-06-26 1977-06-07 Cummins Engine Company, Inc. Isolated engine cover
US4046128A (en) * 1974-10-28 1977-09-06 Fiat Societa Per Azioni Cylinder heads for internal combustion compression-ignition engines
US4066058A (en) * 1976-05-12 1978-01-03 Deere & Company Vibration isolation system
US4495903A (en) * 1981-09-19 1985-01-29 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine
DE3329418A1 (en) * 1983-08-13 1985-02-28 Daimler-Benz Ag, 7000 Stuttgart Means of sealing a cylinder head cover with respect to the cylinder head of an internal combustion engine
US4719892A (en) * 1986-06-26 1988-01-19 General Motors Corporation Cavity closure with isolator seal and method
US5375569A (en) * 1994-01-26 1994-12-27 General Electric Company Multi polymer structures for internal combustion engines
US6371073B1 (en) 2000-11-02 2002-04-16 Caterpillar Inc. Isolated cover with independent sealing system
FR2823796A1 (en) * 2001-04-24 2002-10-25 Skf Ab Cover esp for attenuating noise from i.c. engine has cover and supporting member connected by elastomer component
EP1375930A1 (en) * 2002-06-18 2004-01-02 Bombardier-Rotax GmbH & Co. KG A vibration and noise dampening connection mechanism for connecting a pair of mechanical components
DE102007019467A1 (en) * 2007-04-25 2008-10-30 Elringklinger Ag Mounting for a sealed cover, at a component, has a raised support zone for the screw bolt holes in a longitudinal shape
US20090044773A1 (en) * 2007-06-27 2009-02-19 Jake Hu Valve cover assembly and method of construction
US20100037848A1 (en) * 2008-08-14 2010-02-18 Ford Global Technologies, Llc Valve cover with decoupled nvh isolation and sealing features
US20100326395A1 (en) * 2009-06-26 2010-12-30 Ford Global Technologies, Llc Cover with Integrated Braces
US9091205B2 (en) 2012-04-27 2015-07-28 Ruben Santos Rocker arm accessibility cover assembly
US20170037851A1 (en) * 2014-04-11 2017-02-09 Magna Powertrain Huckeswagen GmbH Motor vehicle vacuum pump having an adhesive

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981247A (en) * 1959-06-29 1961-04-25 Int Harvester Co Locating means for internal combustion engine cylinder head cover gasket
US3090463A (en) * 1960-02-15 1963-05-21 John D Yanda Engine vacuum sound barrier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981247A (en) * 1959-06-29 1961-04-25 Int Harvester Co Locating means for internal combustion engine cylinder head cover gasket
US3090463A (en) * 1960-02-15 1963-05-21 John D Yanda Engine vacuum sound barrier

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046128A (en) * 1974-10-28 1977-09-06 Fiat Societa Per Azioni Cylinder heads for internal combustion compression-ignition engines
US4019600A (en) * 1975-06-09 1977-04-26 Caterpillar Tractor Co. Anti-noise mounting means for transmissions
US4027644A (en) * 1975-06-26 1977-06-07 Cummins Engine Company, Inc. Isolated engine cover
US4066058A (en) * 1976-05-12 1978-01-03 Deere & Company Vibration isolation system
US4495903A (en) * 1981-09-19 1985-01-29 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine
DE3329418A1 (en) * 1983-08-13 1985-02-28 Daimler-Benz Ag, 7000 Stuttgart Means of sealing a cylinder head cover with respect to the cylinder head of an internal combustion engine
US4719892A (en) * 1986-06-26 1988-01-19 General Motors Corporation Cavity closure with isolator seal and method
US5375569A (en) * 1994-01-26 1994-12-27 General Electric Company Multi polymer structures for internal combustion engines
US6371073B1 (en) 2000-11-02 2002-04-16 Caterpillar Inc. Isolated cover with independent sealing system
FR2823796A1 (en) * 2001-04-24 2002-10-25 Skf Ab Cover esp for attenuating noise from i.c. engine has cover and supporting member connected by elastomer component
US20020170775A1 (en) * 2001-04-24 2002-11-21 Stein Hans-Joachim Vom Lid for muffling noises produced by an internal combustion engine, and method for producing such lid
US6896098B2 (en) 2001-04-24 2005-05-24 Ab Skf Lid for muffling noises produced by an internal combustion engine, and method for producing such lid
US20040047684A1 (en) * 2002-06-18 2004-03-11 Rudolf Kusel Means for decoupling mechanical components
EP1375930A1 (en) * 2002-06-18 2004-01-02 Bombardier-Rotax GmbH & Co. KG A vibration and noise dampening connection mechanism for connecting a pair of mechanical components
DE102007019467A1 (en) * 2007-04-25 2008-10-30 Elringklinger Ag Mounting for a sealed cover, at a component, has a raised support zone for the screw bolt holes in a longitudinal shape
US20090044773A1 (en) * 2007-06-27 2009-02-19 Jake Hu Valve cover assembly and method of construction
JP2010531958A (en) * 2007-06-27 2010-09-30 フェデラル−モーグル コーポレイション Valve cover assembly and method of building
US7827950B2 (en) 2007-06-27 2010-11-09 Federal-Mogul Corporation Valve cover assembly and method of construction
US20100037848A1 (en) * 2008-08-14 2010-02-18 Ford Global Technologies, Llc Valve cover with decoupled nvh isolation and sealing features
US8141531B2 (en) * 2008-08-14 2012-03-27 Ford Global Technologies, Llc Valve cover with decoupled NVH isolation and sealing features
US20100326395A1 (en) * 2009-06-26 2010-12-30 Ford Global Technologies, Llc Cover with Integrated Braces
US8550049B2 (en) 2009-06-26 2013-10-08 Ford Global Technologies, Llc Cover with integrated braces
US9091205B2 (en) 2012-04-27 2015-07-28 Ruben Santos Rocker arm accessibility cover assembly
US20170037851A1 (en) * 2014-04-11 2017-02-09 Magna Powertrain Huckeswagen GmbH Motor vehicle vacuum pump having an adhesive
US10094383B2 (en) * 2014-04-11 2018-10-09 Magna Powertrain Bad Homburg GmbH Motor vehicle vacuum pump having an adhesive

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Publication number Publication date
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AS Assignment

Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515

Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515