US2671523A - Silencer or muffler for engine exhausts or the like - Google Patents

Silencer or muffler for engine exhausts or the like Download PDF

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Publication number
US2671523A
US2671523A US234954A US23495451A US2671523A US 2671523 A US2671523 A US 2671523A US 234954 A US234954 A US 234954A US 23495451 A US23495451 A US 23495451A US 2671523 A US2671523 A US 2671523A
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Prior art keywords
core member
silencer
casing
muffler
expansion space
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Expired - Lifetime
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US234954A
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Walker George Bromhead
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/085—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using a central core throttling gas passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/005—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for draining or otherwise eliminating condensates or moisture accumulating in the apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • This invention relates to an improved silencer ormumer for engine exhausts: or'the like ⁇ . and more par-ticularly to an improved construction-of the silencer or muffier described in the specification otmy co-pending United States patent applicatioii Serial No. 144,060, filed February 14, 1950?
  • the object of theinvention is to providean improved construction of silencer or muffler which will have greater efficiency in use with lower back pressure and also is more convenient to manufactu-re.
  • the improved silencer or muffler comprises a casing of progressively increasing diameter from the inlet end, a hollow core member with closed opposite ends concentrically supported within the casing and co-acting with it to form an annular gas expansion space of progressively increasing area receiving the gases from the inlet end, and breather ports or openings in the core member to permit the exhaust gases to pass from the gas expansion space into the hollow core member.
  • the core member functions as a gas accumulator to smooth out the pulsating pressures of the engine exhaust, the gas pressure accumulating in said hollow core member on the high pressure phase and being released through the breather ports or openings on the low pressure phase.
  • the silencer or muflier may also be provided with an outer casing and breather ports or openings may be formed in the casing to communicate with the interior of said outer casing, said ports or openings allowing the exhaust gases to also accumulate in the interior of the outer casing in the same manner as in the hollow core member.
  • Fig. 1 is a longitudinal sectional view of the improved silencer or mufller according to one embodiment of the invention.
  • Figs. 2 and 3 are cross-sections taken on lines 22 and 3--3 of Fig. 1.
  • Fig. 4 is a longitudinal sectional view of the improved silencer or mufiler according to another embodiment of the invention.
  • Fig. 5 is a cross-section taken on line 5-5 of Fig. 4.
  • the rear end of the core member carries a screwed stud l which passes through a central hole 8 in the spider 5 and receives a washer 9 and clamping unit 10.
  • the nut Ill may have an elongated or streamlined tail II.
  • the spider is secured by means of bolts l2 between flanges provided on the rear end of the casing l and a tapered outlet casing l3.
  • the forward end of the core member is provided with a tapered nose M which divides the gas stream entering the casing through the inlet end 2 into an annular stream as it passes to the as expansion space 4.
  • Rearwardly of said nose breather ports or openings I5 are formed in the core member to allow the exhaust gases to enter the hollow interior of the core member from the expansion space 4.
  • the exhaust gases entering through the inlet end 2 of the casing I pass along the tapered nose M of the core member into the annular gas expansion space 4 between said core and the easing.
  • the cross-sectional area of the expansion space progressively increases, the exhaust gases expand in their passage and so become reduced in pressure.
  • the ports IS in the core member allow the exhaust gases from the expansion space to enter the hollow core member which thus functions as a gas accumulator to smooth out the pulsating pressures of the exhaust.
  • the gas pressure accumulates in the hollow core member and is released on the low pressure phase.
  • the gases escape from the outlet they are greatly reduced in pressure and substantially free from pulsations. Noise is thereby practically eliminated.
  • the casing l is provided with an outer casing l6 and a plurality of additional breather holes or ports I! are formed in the casing to communicate with the interior of said outer casing. These holes permit the exhaust gases to also accumulate in the interior of the casing IS in the same manner as in the hollow core member 3.
  • any moisture condensing in the silencer may escape by providing a draining extension I8 on
  • the core member is of' substantially cyunuricar shape the lower opening of the spider 5, said extension communicating with openings 19 in the flanges of the casings I and 13, see Figs. 1 and 3.
  • the outer casing IS in the embodiment shown in Figs. 4 and 5 may also have a draining hole 20 for the same purpose.
  • the silencer or mufiler as herein described is more convenient to manufacture than the previous constructions and, as previously mentioned, will be found to have greater efliciency with lower back pressure.
  • a muilier for engine exhausts comprising a frusto-conical casing having an inlet end and an outlet end being substantially larger than said inlet end so that said frusto-conical casing has a progressively increasing diameter from said inlet end to said outlet end, a substantially cylindrical hollow core member having closed opposite conical end pieces concentrically supported within said frusto-conical casing and coacting with the same so as to form an annular gas expansion space of progressively increasing area receiving the gases from said inlet end, and breather ports in said cylindrical core member permitting the exhaust gases to pass from said gas expansion space into said cylindrical hollow core member, whereby said progressively increasing expansion space reduces the back pressure of the mufller and said cylindrical core member operates as a gas accumulator smoothing out the pulsating pressures of the engine exhaust, the gas pressure accumulating in said cylindrical hollow core member on the high pressure phase and being released through said breather ports on the low pressure phase, an outer casing and breather openings in said frusto-conical casing to communicate

Description

G. B. WALKER SILENCER 0R MUFFLER FOR ENGINE EXHAUSTS OR THE LIKE March 9, 1954 w 2 Sheets-Sheet 1 Filed July 5, 1951 SILENCER OR MUFFLER'FOR ENGINE EXHAUSTS OR THE LIKE Filed July 5, 1951 G. B. WA LKER March 9, 1954 2 Sheets-Sheet 2 Patented Mar. 9, 1954 UNITED STATES: 2,671,523
sIn-ENcEn on" UFFLEE-F R-ENGINE EXHAUS-TS R THELIKE GeDrge-" Bro'mheaw Walker, Fulham, London, England.
Application July 3; 1951, Serial N0.-"234;954
1 Claim. 1
This invention relates to an improved silencer ormumer for engine exhausts: or'the like}. and more par-ticularly to an improved construction-of the silencer or muffier described in the specification otmy co-pending United States patent applicatioii Serial No. 144,060, filed February 14, 1950? The object of theinvention is to providean improved construction of silencer or muffler which will have greater efficiency in use with lower back pressure and also is more convenient to manufactu-re.
According to the invention, the improved silencer or muffler comprises a casing of progressively increasing diameter from the inlet end, a hollow core member with closed opposite ends concentrically supported within the casing and co-acting with it to form an annular gas expansion space of progressively increasing area receiving the gases from the inlet end, and breather ports or openings in the core member to permit the exhaust gases to pass from the gas expansion space into the hollow core member. The core member functions as a gas accumulator to smooth out the pulsating pressures of the engine exhaust, the gas pressure accumulating in said hollow core member on the high pressure phase and being released through the breather ports or openings on the low pressure phase.
The silencer or muflier may also be provided with an outer casing and breather ports or openings may be formed in the casing to communicate with the interior of said outer casing, said ports or openings allowing the exhaust gases to also accumulate in the interior of the outer casing in the same manner as in the hollow core member.
The invention is more fully described aided by reference to the accompanying drawing wherein:
Fig. 1 is a longitudinal sectional view of the improved silencer or mufller according to one embodiment of the invention.
Figs. 2 and 3 are cross-sections taken on lines 22 and 3--3 of Fig. 1.
Fig. 4 is a longitudinal sectional view of the improved silencer or mufiler according to another embodiment of the invention.
Fig. 5 is a cross-section taken on line 5-5 of Fig. 4.
In the construction shown in Figs. 1 to 3, the silencer 0r mufller has a casing l of progressively increasing diameter from the inlet end 2 and a hollow core member 3 concentrically supported within the casing and co-acting with it to form the annular gas expansion space 4 of progressive- 1y increasing cross=sectional area";
closed at both ends and is-centrali'z'ed and sup= to the core member andare'adapted toengagethe' inner wall of the tapering casing with a wedge- The rear end of the core member carries a screwed stud l which passes through a central hole 8 in the spider 5 and receives a washer 9 and clamping unit 10. The nut Ill may have an elongated or streamlined tail II. The spider is secured by means of bolts l2 between flanges provided on the rear end of the casing l and a tapered outlet casing l3.
The forward end of the core member is provided with a tapered nose M which divides the gas stream entering the casing through the inlet end 2 into an annular stream as it passes to the as expansion space 4. Rearwardly of said nose breather ports or openings I5 are formed in the core member to allow the exhaust gases to enter the hollow interior of the core member from the expansion space 4.
In use, the exhaust gases entering through the inlet end 2 of the casing I pass along the tapered nose M of the core member into the annular gas expansion space 4 between said core and the easing. As the cross-sectional area of the expansion space progressively increases, the exhaust gases expand in their passage and so become reduced in pressure.
The ports IS in the core member allow the exhaust gases from the expansion space to enter the hollow core member which thus functions as a gas accumulator to smooth out the pulsating pressures of the exhaust. On the high pressure phase, the gas pressure accumulates in the hollow core member and is released on the low pressure phase. Thus, when the gases escape from the outlet they are greatly reduced in pressure and substantially free from pulsations. Noise is thereby practically eliminated.
In the construction shown in Figs. 4 and 5, the casing l is provided with an outer casing l6 and a plurality of additional breather holes or ports I! are formed in the casing to communicate with the interior of said outer casing. These holes permit the exhaust gases to also accumulate in the interior of the casing IS in the same manner as in the hollow core member 3.
Any moisture condensing in the silencer may escape by providing a draining extension I8 on The core member is of' substantially cyunuricar shape the lower opening of the spider 5, said extension communicating with openings 19 in the flanges of the casings I and 13, see Figs. 1 and 3. The outer casing IS in the embodiment shown in Figs. 4 and 5 may also have a draining hole 20 for the same purpose.
The silencer or mufiler as herein described is more convenient to manufacture than the previous constructions and, as previously mentioned, will be found to have greater efliciency with lower back pressure.
What I claim is:
A muilier for engine exhausts comprising a frusto-conical casing having an inlet end and an outlet end being substantially larger than said inlet end so that said frusto-conical casing has a progressively increasing diameter from said inlet end to said outlet end, a substantially cylindrical hollow core member having closed opposite conical end pieces concentrically supported within said frusto-conical casing and coacting with the same so as to form an annular gas expansion space of progressively increasing area receiving the gases from said inlet end, and breather ports in said cylindrical core member permitting the exhaust gases to pass from said gas expansion space into said cylindrical hollow core member, whereby said progressively increasing expansion space reduces the back pressure of the mufller and said cylindrical core member operates as a gas accumulator smoothing out the pulsating pressures of the engine exhaust, the gas pressure accumulating in said cylindrical hollow core member on the high pressure phase and being released through said breather ports on the low pressure phase, an outer casing and breather openings in said frusto-conical casing to communicate with the interior of said outer casing, said openings allowing the exhaust gases to also accumulate in the interior of said outer casing.
GEORGE BROMHEAD WALKER.
References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 965,135 Gibson July 19, 1910 1,597,397 Wilkinson Apr. 24, 1926 2,108,671 Kato Feb. 15, 1938 FOREIGN PATENTS Number Country Date 336,705 Great Britain Oct. 23, 1930 746,798 France June 6, 1933
US234954A 1950-07-14 1951-07-03 Silencer or muffler for engine exhausts or the like Expired - Lifetime US2671523A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2869671A (en) * 1953-08-31 1959-01-20 Karl E Schlachter Gas turbine muffler
US3119459A (en) * 1961-02-13 1964-01-28 Arvin Ind Inc Sound attenuating gas conduit
US3166151A (en) * 1957-09-18 1965-01-19 Walker Mfg Co Muffler
US3884323A (en) * 1974-07-11 1975-05-20 Du Pont Device for gas-exit ducts to convert vortical gas flow to sound-attenuated axial gas flow
US4226298A (en) * 1979-07-17 1980-10-07 Guy Henri Bancel Exhaust device for internal combustion engines
US4936413A (en) * 1989-07-10 1990-06-26 Siemens-Bendix Automotive Electronics Limited In-line noise attenuation device for a gas conduit
US5123501A (en) * 1988-10-21 1992-06-23 Donaldson Company, Inc. In-line constricted sound-attenuating system
US5925857A (en) * 1996-08-27 1999-07-20 Birkel; Jeffrey F. Inverted cone tuned exhaust system
US20040163887A1 (en) * 2003-02-25 2004-08-26 Ziehl John C. Exhaust silencer system
FR2955900A1 (en) * 2010-02-01 2011-08-05 Hutchinson ACOUSTICAL ATTENUATION DEVICE FOR THE INTAKE LINE OF A THERMAL MOTOR, FLEXIBLE PIPE AND ADMISSION LINE INCORPORATING IT
US8851231B1 (en) * 2013-03-15 2014-10-07 Kenneth Murphy Land vehicle exhaust noise control apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US965135A (en) * 1908-12-30 1910-07-19 Hugo C Gibson Internal-combustion engine.
US1597397A (en) * 1924-04-04 1926-08-24 Paul H Wilkinson Muffler
GB336705A (en) * 1929-08-10 1930-10-23 Horace Gastineau Hills Improvements in exhaust silencers
FR746798A (en) * 1932-08-19 1933-06-06 Improvement in silencers for internal combustion engines
US2108671A (en) * 1933-12-27 1938-02-15 Gonsaburo Ishibashi Muffler of internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US965135A (en) * 1908-12-30 1910-07-19 Hugo C Gibson Internal-combustion engine.
US1597397A (en) * 1924-04-04 1926-08-24 Paul H Wilkinson Muffler
GB336705A (en) * 1929-08-10 1930-10-23 Horace Gastineau Hills Improvements in exhaust silencers
FR746798A (en) * 1932-08-19 1933-06-06 Improvement in silencers for internal combustion engines
US2108671A (en) * 1933-12-27 1938-02-15 Gonsaburo Ishibashi Muffler of internal combustion engines

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2869671A (en) * 1953-08-31 1959-01-20 Karl E Schlachter Gas turbine muffler
US3166151A (en) * 1957-09-18 1965-01-19 Walker Mfg Co Muffler
US3119459A (en) * 1961-02-13 1964-01-28 Arvin Ind Inc Sound attenuating gas conduit
DE1299647B (en) * 1961-02-13 1969-07-24 Arvin Ind Inc Sound-absorbing gas pipe
US3884323A (en) * 1974-07-11 1975-05-20 Du Pont Device for gas-exit ducts to convert vortical gas flow to sound-attenuated axial gas flow
US4226298A (en) * 1979-07-17 1980-10-07 Guy Henri Bancel Exhaust device for internal combustion engines
US5123501A (en) * 1988-10-21 1992-06-23 Donaldson Company, Inc. In-line constricted sound-attenuating system
US4936413A (en) * 1989-07-10 1990-06-26 Siemens-Bendix Automotive Electronics Limited In-line noise attenuation device for a gas conduit
US5925857A (en) * 1996-08-27 1999-07-20 Birkel; Jeffrey F. Inverted cone tuned exhaust system
WO2000070200A1 (en) * 1996-08-27 2000-11-23 Birkel Jeffrey F Inverted cone tuned exhaust system
US20040163887A1 (en) * 2003-02-25 2004-08-26 Ziehl John C. Exhaust silencer system
US6868939B2 (en) 2003-02-25 2005-03-22 Vicious Cycle Performance, Inc. Exhaust silencer system
FR2955900A1 (en) * 2010-02-01 2011-08-05 Hutchinson ACOUSTICAL ATTENUATION DEVICE FOR THE INTAKE LINE OF A THERMAL MOTOR, FLEXIBLE PIPE AND ADMISSION LINE INCORPORATING IT
EP2354524A1 (en) * 2010-02-01 2011-08-10 Hutchinson Acoustic attenuation device for an intake line of a thermal engine, flexible tube and intake line comprising such a device
US8851231B1 (en) * 2013-03-15 2014-10-07 Kenneth Murphy Land vehicle exhaust noise control apparatus

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