US3655011A - Sound attenuating chamber - Google Patents

Sound attenuating chamber Download PDF

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Publication number
US3655011A
US3655011A US3655011DA US3655011A US 3655011 A US3655011 A US 3655011A US 3655011D A US3655011D A US 3655011DA US 3655011 A US3655011 A US 3655011A
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Prior art keywords
exhaust
length
tuner
tube
system
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Earl G Willett
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Tenneco Inc
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Tenneco Inc
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/02Silencing apparatus characterised by method of silencing by using resonance

Abstract

A short overall length quarter wave or Quincke tuner for use in automotive exhaust systems to attenuate predetermined sound frequencies is provided by a folded or box structure or a helical structure providing a zig-zag sound path with an effective acoustical length that is materially greater than the physical length of the tuner.

Description

O Unlted States Patent [151 3,655,011 Willett [451 Apr. 11, 197 2 [54] SOUND ATTENUATING CHAMBER 3,396,812 8/1968 Wilcox et a1... "181/48 [72] Inventor: Earl G. wine, Racine Wis 3,429,397 2/1969 Case ..18l/72 [73] Assignee Tenneco lnc., Racine, Wis. FOREIGN PATENTS OR APPLICATIONS J Gfat Britain [2]] Appl. No.: 45,041 Primary Examiner-Richard B. Wilkinson Assistant Examiner-John F. Gonzales 52 US. Cl 181/48, 181/59 Am'"ey fiamess Dmkey [5 1] Int. Cl ..F01n 1/02 57 ABSTRACT [58] Field ofSearch ..l81/48, 54, 59, 53,362, 72 1 A short overall length quarter wave or Qumcke tuner for use 56] References Cited in automotive exhaust systems to attenuate predetermined sound frequencies is provided by a folded or box structure or a UNITED STATES PATENTS helical structure providing a zig-zag sound path with an effect' t' 11 ththt' t I! 1 th th h 3,402,7ss 9/1968 Powers et al 1 8 1/72 x l ffig 'ffif ai a ma em y gm er e p 3,525,419 8/1970 Cassei ..181/48 3,194,341 7/1965 Haag ..181/54 X 2 Claims, 6 Drawing Figures SOUND ATTENUATING CHAMBER It is the purpose of the invention to make the quarter wave or Quincke principle of sound attenuation of more practical use in the design of exhaust systems for internal combustion engines used in motor vehicles.

The invention accomplishes this by means of a quarter wave length tuner that is shaped to provide a zig-zag path for sound waves. Use of this type of path reduces the overall length of the tuner while still permitting a relatively long acoustic length. The device is therefore more suitable for use in the restricted and oddly shaped spaces available for exhaust system components on the chassis of modern automobiles.

DESCRIPTION OF THE DRAWINGS FIG. I is a schematic side elevation of an internal combustion engine having an exhaust system using one form of quarter wave length tuner construction embodying the invention;

FIG. 2 is a cross section along the line 2-2 of FIG. I on an enlarged scale;

FIG. 3 is a section along the line 3-3 of FIG. 2;

FIG. 4 is a schematic side elevation of an internal combustion engine having an exhaust system utilizing a modified form of quarter wave length tuner embodying the invention;

FIG. 5 is an enlargement of the structure within the circle 5 of FIG. 4; and

FIG. 6 is a cross section along the line 6-6 of FIG. 4.

DETAILED DESCRIPTION OF THE INVENTION An internal combustion engine 1 has an exhaust system 3 connected to the exhaust manifold 5 for delivering gases from the manifold to the rear of an automobile and attenuating sound therein enroute. The exhaust system 3 comprises an exhaust pipe 7 which conducts gases from the manifold to a muffler 9 of any suitable construction which in turn is connected to a tailpipe 11 that discharges the silenced gases to atmosphere.

In accordance with this invention, a quarter wave length tuner 13 is connected to the exhaust pipe 7 at an appropriate pressure point or position with respect to the anti-node of the frequency to be attenuated as is known to those in this field. For connection purposes, the tuner 13 has a combination inlet and outlet 15 which is welded or otherwise firmly and sealingly secured around an opening in the wall of the pipe 7 and which may be of various lengths to suit the frequency being attenuated and the mounted positions of the tuner. As shown best in FIGS. 2 and 3, the tuner 13 comprises a substantially rectangular box 17 which is closed on all sides and provides an internal chamber 19. The space 19 within the box 17 is subdivided by a plurality of parallel, spaced, and staggered partitions or baffles which extend most but not all the way across the width of the box 17. Thus, the partitions 21 and 23 extend from one wall 24 toward but stop short of the opposite wall and in the reverse sense the partitions 25 and 27 extend from the second wall 28 toward but short of the first wall. The spacing of the ends of the partitions from the respective walls is preferably substantially equal to the spacing between the partitions.

As seen best in FIG. 3, this staggered arrangement of the baffles provides a zig-zag path of substantially uniform cross sectional area for the travel of sound waves from the inlet member 15 to the surface 29 at the end of the path and reflection back from the surface 29 to effect cancellation. The

length of the zig-zag path along the centerline leading from the connection of the tuner 13 to the tube 7 to the surface 29 comprises the efi'ective acoustic length of the tuner 13 and this, as is well known, is selected to be approximately one quarter of the wave length that it is desired to attenuate and for which the inlet 15 is positioned. In this form of the invention the separate sections of the zig-zag path are substantially paralleltq each other making for a very compact arrangement with minimum overall physical dimensions. The box can therefore be positioned in various unused spaces beneath the vehicle body (not shown) such as a fender wall, beneath a seat, in a trunk, etc. Since relatively long effective lengths are obtainable, the arrangement is especially useful in silencing low frequencies.

In FIG. 4 there is again an internal combustion engine 51 having an exhaust system 53 receiving gases from the exhaust manifold 55 and including an exhaust pipe 57 and a muffler 59 that is connected to the tailpipe 61. Gas flows from the exhaust manifold 55 through the pipe 57 to the muffler 59 and then through the tailpipe 61 to atmosphere.

The exhaust system 3 includes a quarter wave length tuner 63 that is in the form of a unifonn diameter pipe that is helically wrapped around the gas flow tube 57. One end of the pipe 65 is connected to open into the pipe 57 at point 67 and the other end of the pipe is closed as seen at 69. The point 67 is located as close as possible to an optimum pressure point or anti-nodal point for the frequency to be attenuated as is known to workers in this field.

The corkscrew shape of the tube 65 provides it with oppositely extending turns 71 and 73 which provide a zig-zag path of a helical naturethrough which-sound can travel from the inlet 67 to the end 69 of the tuner, the effective internal length of the tuner tube 65 being approximately one quarter of the wave length of the frequency to be attenuated.

In the arrangement of FIG. 4 tuner pipe 65 is in contact with the exhaust pipe 57 and therefore is in heat transfer relationship with it. The heat of the exhaust gases passing through pipe 57 will therefore be transmitted to the pipe 57 and pipe 65 to the interior of the tuner. While this has some adverse effect on the efficiency of tuning it has the advantage of broad-banding the tuner 63 so that a wider spectrum of frequencies may be attenuated.

Modifications in the specific structures may be made without departing from the spirit and scope of the invention.

1 claim:

1. In an exhaust system for an internal combustion engine, said engine producing various sound frequencies including at least one low frequency to be silenced by the exhaust system, said exhaust system including a gas flow tube, and a quarter wave length tuner connected to said gas flow tube in parallel with it and having a combination inlet and outlet opening and closed tube means extending from said opening, the internal length of the tube means being substantially one quarter of the wave length of said low frequency, said tube means being substantially helical in shape and coiled around the gas flow tube and in heat transfer relationship with it.

2. In an exhaust system for an internal combustion engine, said engine producing various sound frequencies including at least one low frequency to be silenced by the exhaust system, said exhaust system including a gas flow tube, and a quarter wave length tuner connected to said gas flow tube in parallel with it and having a combination inlet and outlet opening and comprising a closed box having staggered parallel baffles therein providing a zig-zag path having a length equal to substantially one quarter of the wave length of said low frequency.

Claims (2)

1. In an exhaust system for an internal combustion engine, said engine producing various sound frequencies including at least one low frequency to be silenced by the exhaust system, said exhaust system including a gas flow tube, and a quarter wave length tuner connected to said gas flow tube in parallel with it and having a combination inlet and outlet opening and closed tube means extending from said opening, the internal length of the tube means being substantially one quarter of the wave length of said low frequency, said tube means being substantially helical in shape and coiled around the gas flow tube and in heat transfer relationship with it.
2. In an exhaust system for an internal combustion engine, said engine producing various sound frequencies including at least one low frequency to be silenced by the exhaust system, said exhaust system including a gas flow tube, and a quarter wave length tuner connected to said gas flow tube in parallel with it and having a combination inlet and outlet opening and comprising a closed box having staggered parallel baffles therein providing a zig-zag path having a length equal to substantially one quarter of the wave length of said low frequency.
US3655011A 1970-06-10 1970-06-10 Sound attenuating chamber Expired - Lifetime US3655011A (en)

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2466613A1 (en) * 1979-10-01 1981-04-10 Rosi Ets Engine exhaust noise silencer - has casing with cells temporarily storing gas under pressure released when pressure falls
US4645031A (en) * 1984-04-13 1987-02-24 Nissan Motor Company, Limited Exhaust system for an internal combustion engine
US5502283A (en) * 1991-09-25 1996-03-26 Toyoda Boshoku Kabushiki Kaisha Muffler
US5801344A (en) * 1995-08-17 1998-09-01 Arvin Industries, Inc. Sound attenuator with throat tuner
US6508331B1 (en) * 1999-09-16 2003-01-21 Siemens Canada Limited Variable resonator
US6796859B1 (en) * 2000-11-16 2004-09-28 Bombardier Recreational Products Inc. Air intake silencer
US20050016792A1 (en) * 2001-12-22 2005-01-27 Mann + Hummel Gmbh Noise suppressor apparatus for a gas duct
US20050161280A1 (en) * 2002-12-26 2005-07-28 Fujitsu Limited Silencer and electronic equipment
US20050230182A1 (en) * 1999-08-05 2005-10-20 Faurecia Systemes D'echappement Exhaust volume
US20070051556A1 (en) * 2005-09-02 2007-03-08 Arvin Technologies, Inc. Exhaust system with external Helmholtz resonator and associated method
US20090014238A1 (en) * 2007-07-10 2009-01-15 Huff Ronald G Muffler
US20090065280A1 (en) * 2007-09-12 2009-03-12 Yamaha Hatsudoki Kabushiki Kaisha Exhaust pipe for a vehicle
US20100180583A1 (en) * 2008-06-13 2010-07-22 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle, marine vessel, and exhausting method for internal combustion engine
US20100192556A1 (en) * 2008-06-13 2010-08-05 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle, marine vessel, and secondary air supply method for internal combustion engine
USD622453S1 (en) 2001-08-01 2010-08-24 Rick Meritt Investments, Ltd. Animal feeder
USD624708S1 (en) 2001-08-01 2010-09-28 Rick Meritt Investments, Ltd. Feeder for quail or turkey
USD624706S1 (en) 2001-08-01 2010-09-28 Rick Meritt Investments, Ltd. Animal feeder
US20100270103A1 (en) * 2007-07-10 2010-10-28 Tmg Performance Products, Llc Exhaust muffler
USD629975S1 (en) 2001-08-01 2010-12-28 Rick Meritt Investments, Ltd. Feeding tube
USD647253S1 (en) 2011-02-21 2011-10-18 Rick Meritt Investments, Ltd. Wildlife feeder
USD681883S1 (en) 2001-08-01 2013-05-07 Rick Meritt Investments, Ltd. Wildlife feeder
US20130206500A1 (en) * 2011-03-22 2013-08-15 Mitsubishi Heavy Industries, Ltd. Acoustic damper, combustor, and gas turbine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB131434A (en) * 1918-08-17 1919-08-18 William Hooton Improvements in Silencers for Engines.
US3194341A (en) * 1963-01-21 1965-07-13 Junkers & Co Sound absorber with partitions forming meandering channels connected to resonance duct
US3396812A (en) * 1967-07-05 1968-08-13 Arvin Ind Inc Acoustic quarter wave tube
US3402785A (en) * 1965-10-23 1968-09-24 Walker Mfg Co Muffler with resonance chambers for high and low frequencies
US3429397A (en) * 1967-09-26 1969-02-25 Walker Mfg Co Laminated conduit and acoustic silencer
US3525419A (en) * 1968-02-07 1970-08-25 Cassel Thomas Richard Exhaust system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB131434A (en) * 1918-08-17 1919-08-18 William Hooton Improvements in Silencers for Engines.
US3194341A (en) * 1963-01-21 1965-07-13 Junkers & Co Sound absorber with partitions forming meandering channels connected to resonance duct
US3402785A (en) * 1965-10-23 1968-09-24 Walker Mfg Co Muffler with resonance chambers for high and low frequencies
US3396812A (en) * 1967-07-05 1968-08-13 Arvin Ind Inc Acoustic quarter wave tube
US3429397A (en) * 1967-09-26 1969-02-25 Walker Mfg Co Laminated conduit and acoustic silencer
US3525419A (en) * 1968-02-07 1970-08-25 Cassel Thomas Richard Exhaust system

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2466613A1 (en) * 1979-10-01 1981-04-10 Rosi Ets Engine exhaust noise silencer - has casing with cells temporarily storing gas under pressure released when pressure falls
US4645031A (en) * 1984-04-13 1987-02-24 Nissan Motor Company, Limited Exhaust system for an internal combustion engine
US5502283A (en) * 1991-09-25 1996-03-26 Toyoda Boshoku Kabushiki Kaisha Muffler
US5801344A (en) * 1995-08-17 1998-09-01 Arvin Industries, Inc. Sound attenuator with throat tuner
US20050230182A1 (en) * 1999-08-05 2005-10-20 Faurecia Systemes D'echappement Exhaust volume
US7240769B2 (en) * 1999-08-05 2007-07-10 Faurecia Systemes D'echappement Exhaust volume
US6508331B1 (en) * 1999-09-16 2003-01-21 Siemens Canada Limited Variable resonator
US6796859B1 (en) * 2000-11-16 2004-09-28 Bombardier Recreational Products Inc. Air intake silencer
USD636942S1 (en) 2001-08-01 2011-04-26 Rick Meritt Investments, Ltd. Fawn feeder
US8201520B2 (en) 2001-08-01 2012-06-19 Rick Meritt Investments, Ltd. Animal feeding apparatus
USD629975S1 (en) 2001-08-01 2010-12-28 Rick Meritt Investments, Ltd. Feeding tube
USD681883S1 (en) 2001-08-01 2013-05-07 Rick Meritt Investments, Ltd. Wildlife feeder
USD629976S1 (en) * 2001-08-01 2010-12-28 Rick Meritt Investments, Ltd. Animal feeder
USD629572S1 (en) 2001-08-01 2010-12-21 Rick Meritt Investments, Ltd. Animal feeder
USD624707S1 (en) 2001-08-01 2010-09-28 Rick Meritt Investments, Ltd. Fawn feeder
USD624709S1 (en) 2001-08-01 2010-09-28 Rick Meritt Investments, Ltd. Breeding pen feeder
USD624706S1 (en) 2001-08-01 2010-09-28 Rick Meritt Investments, Ltd. Animal feeder
USD622453S1 (en) 2001-08-01 2010-08-24 Rick Meritt Investments, Ltd. Animal feeder
USD624708S1 (en) 2001-08-01 2010-09-28 Rick Meritt Investments, Ltd. Feeder for quail or turkey
US20050016792A1 (en) * 2001-12-22 2005-01-27 Mann + Hummel Gmbh Noise suppressor apparatus for a gas duct
US7117973B2 (en) * 2001-12-22 2006-10-10 Mann & Hummel Gmbh Noise suppressor apparatus for a gas duct
US20050161280A1 (en) * 2002-12-26 2005-07-28 Fujitsu Limited Silencer and electronic equipment
US7870930B2 (en) * 2005-09-02 2011-01-18 Emcon Technologies Llc Exhaust system with external helmholtz resonator and associated method
US20070051556A1 (en) * 2005-09-02 2007-03-08 Arvin Technologies, Inc. Exhaust system with external Helmholtz resonator and associated method
US7942239B2 (en) 2007-07-10 2011-05-17 Tmg Performance Products, Llc Exhaust muffler
US20100270103A1 (en) * 2007-07-10 2010-10-28 Tmg Performance Products, Llc Exhaust muffler
US20090014237A1 (en) * 2007-07-10 2009-01-15 Keith Skowronski Muffler
US20090014238A1 (en) * 2007-07-10 2009-01-15 Huff Ronald G Muffler
US7798286B2 (en) * 2007-07-10 2010-09-21 Tmg Performance Products, Llc Exhaust muffler having a horizontally extending sound attenuation chamber
US20090065280A1 (en) * 2007-09-12 2009-03-12 Yamaha Hatsudoki Kabushiki Kaisha Exhaust pipe for a vehicle
US8302727B2 (en) * 2007-09-12 2012-11-06 Yamaha Hatsudoki Kabushiki Kaisha Exhaust pipe for a vehicle
US20100180583A1 (en) * 2008-06-13 2010-07-22 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle, marine vessel, and exhausting method for internal combustion engine
US20100192553A1 (en) * 2008-06-13 2010-08-05 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle, marine vessel, and exhaust gas cleaning method for internal combustion engine
US20100192556A1 (en) * 2008-06-13 2010-08-05 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle, marine vessel, and secondary air supply method for internal combustion engine
US8312713B2 (en) * 2008-06-13 2012-11-20 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle, marine vessel, and exhausting method for internal combustion engine
US8316639B2 (en) * 2008-06-13 2012-11-27 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle, marine vessel, and exhaust gas cleaning method for internal combustion engine
US8359836B2 (en) * 2008-06-13 2013-01-29 Yamaha Hatsudoki Kabushiki Kaisha Internal combustion engine, vehicle, marine vessel, and secondary air supply method for internal combustion engine
USD647253S1 (en) 2011-02-21 2011-10-18 Rick Meritt Investments, Ltd. Wildlife feeder
US20130206500A1 (en) * 2011-03-22 2013-08-15 Mitsubishi Heavy Industries, Ltd. Acoustic damper, combustor, and gas turbine
US8733496B2 (en) * 2011-03-22 2014-05-27 Mitsubishi Heavy Industries, Ltd. Acoustic damper, combustor, and gas turbine

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