US2652128A - Retroverted passage type muffler with expansion chambers - Google Patents

Retroverted passage type muffler with expansion chambers Download PDF

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Publication number
US2652128A
US2652128A US181124A US18112450A US2652128A US 2652128 A US2652128 A US 2652128A US 181124 A US181124 A US 181124A US 18112450 A US18112450 A US 18112450A US 2652128 A US2652128 A US 2652128A
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United States
Prior art keywords
expansion chambers
chambers
expansion
tube
tubes
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Expired - Lifetime
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US181124A
Inventor
Beecher B Cary
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HAYES IND Inc
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HAYES IND Inc
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Priority to US181124A priority Critical patent/US2652128A/en
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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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • 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
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/20—Methods or apparatus for fitting, inserting or repairing different elements by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions

Definitions

  • the present invention relates to improvements in muillers for use on multiple cylinder, high speed, high compression engines of automobiles.
  • the invention is deemed to reside in details of construction and the arrangement and combination of parts.
  • Fig. I is a vertical cross-sectional View of a muffler embodying the structural principles of the present invention.
  • Fig. II is a cross-sectional view taken on line A.
  • the outer casing I6 of the muiller is of elliptical cross-section comprising an outer sheet metal shell I2 spot welded along the lap seam I4, a layer of asbestos I6 and a double wrapped inner sheet metal shell I8 spot welded along the lap seam 20.
  • the heads 22 and 24 are rolled upon the inner shell I8 with deformation of the inner and outer shells I2 and I8 in the manner indicated in Fig. I.
  • the inlet and outlet tubes 26 and 28, respectively, are spot welded in flanged apertures 30 and 32 of the heads 22 and 24.
  • the structure for providing retroverted flow of the exhaust gases entering the inlet 26 is in the form of a unit having a slip t connection with the inner shell I8 and the inlet and outlet tubes 26 and 28.
  • This unit comprises tubes 34 and 36 which may be of approximately the same size and length, except for the exterior portion 38 having a slip t with the inlet tube 26, and a 2 much longer tube 40 which extends practically the entire length of the muffler and has a slip iit with the outlet tube 28.
  • the tubes 34, 36 and 40 are perforated at 4I, preferably in the manner disclosed in U. S. Patent No. 2,070,543.
  • the interior of the tube 40 is in communication with the acoustic chamber 46 defined by the shell 48 provided with longitudinal flanges 50.
  • the flanges 50 provide structural support across the minor axis of the casing I0 with respect to inwardly directed forces only as there is a slip iit between their outer edges 52 and the interior wall of the shell I8.
  • the flanges 50 have the further function of forming a partition along with the shell 48 for the chambers 54 and 56 with which the interiors of the tubes 34 and 36, respectively, communicate through the perforations at 4I.
  • the tube 36 discharges exhaust gases from the inlet tube 26 into the expansion and resonator chamber 58 defined between the head 42 and the baille 6I] with which the tube 40 has a slip fit at 62. Restricted openings 64 in the head 42 places the chamber 58 in compound arrangement with the chambers 54 and 56.
  • Expanded gases from the chamber 56 flow in the tube 34 in counterdirection to the gas flow in the tube 36 into the secondary expansion chamber 66 from which the expanded and sound attenuated gases are conducted by the tube 46 to the outlet 28. Further sound attenuation takes place as the gases flow through the tube 40 as a result of the embracing acoustic chamber 46 and the enlarged lower frequency chamber 68 defined between the baille 60 and the head 24.
  • Elongated slots 10 provide communication be tween the interior of the tube 40 and the chamber 68, being preferred to the arch type of perforation 4I at this particular point.
  • the diameter of the tube 40 may be less than the tubes 34 and 36, if desired.
  • a muler comprising an outer casing having heads at opposite ends including an inlet and an outlet, a pair of expansion chambers located in said casing, a retroverted gas flow unit disposed in said casing and located between said chambers, said unit including three tubes, one of which conducts gases from said inlet across one of said expansion chambers and discharges the gases into said other expansion chamber, another of said tubes conducting gases between said expansion chambers, and the third of said tubes conducting gases from the first of said expansion chambers across the second of said expansion chambers to said outlet, sound attenuation chambers embracing said tubes between said expansion chambers, openings defined in the Wall of said tubes within the area embraced by said sound attenuation chambers to acoustically connect the interior of said tubes with the interior of said sound attenuation chambers, a transverse wall common to and constituting one of the end walls for each of said sound attenuation chambers and also defining one of the end walls of one of said expansion chambers, and openings defined in said transverse wall to bring said last mentioned expansion

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Description

Patented Sept. 15,1953
RETROVERTED PASSAGE TYPE MUFFLER WITH EXPANSION CHAMBERS Beecher B. Cary, Jackson, Mich., assignor to Hayes Industries, Inc., Jackson, Mich., a corporation of Michigan Application August Z4, 1950, Serial N o. 181,124
(Cl. ISI- 54) 1 Claim. l
The present invention relates to improvements in muillers for use on multiple cylinder, high speed, high compression engines of automobiles.
In the design of automobile muillers maximum sound attenuation over a wide operating range is desired along with restricted limitation upon the size, and shape of the muffler due to frame and body construction.
From the standpoint of minimum back pressure, straight through flow type of mufers give the best performance, However, where maximum sonud attenuation over a wide operating range is required, this type of muffler becomes of excessive length, shell noises are diicult to control and expansion and contraction problems are multiplied by the length of the component parts of the muffler.
It is the object of the present invention to provide a mulller in which the advantages of the retroverted type of construction has been combined with some of the chambering and conduit characteristics of the straight through type to provide a relative compact, structurally strong, high capacity muiller which will give substantial sound attenuation over the full operating use of the present day high speed, high compression automobile internal combustion engine with minimum back pressure. The invention is deemed to reside in details of construction and the arrangement and combination of parts.
In the accompanying drawings,
Fig. I is a vertical cross-sectional View of a muffler embodying the structural principles of the present invention, and
Fig. II is a cross-sectional view taken on line A.
II-II of Fig. I.
The outer casing I6 of the muiller is of elliptical cross-section comprising an outer sheet metal shell I2 spot welded along the lap seam I4, a layer of asbestos I6 and a double wrapped inner sheet metal shell I8 spot welded along the lap seam 20. The heads 22 and 24 are rolled upon the inner shell I8 with deformation of the inner and outer shells I2 and I8 in the manner indicated in Fig. I. The inlet and outlet tubes 26 and 28, respectively, are spot welded in flanged apertures 30 and 32 of the heads 22 and 24.
The structure for providing retroverted flow of the exhaust gases entering the inlet 26 is in the form of a unit having a slip t connection with the inner shell I8 and the inlet and outlet tubes 26 and 28. This unit comprises tubes 34 and 36 which may be of approximately the same size and length, except for the exterior portion 38 having a slip t with the inlet tube 26, and a 2 much longer tube 40 which extends practically the entire length of the muffler and has a slip iit with the outlet tube 28.
Between the heads 42 and 44 the tubes 34, 36 and 40 are perforated at 4I, preferably in the manner disclosed in U. S. Patent No. 2,070,543. Through these perforations the interior of the tube 40 is in communication with the acoustic chamber 46 defined by the shell 48 provided with longitudinal flanges 50. The flanges 50 provide structural support across the minor axis of the casing I0 with respect to inwardly directed forces only as there is a slip iit between their outer edges 52 and the interior wall of the shell I8. The flanges 50 have the further function of forming a partition along with the shell 48 for the chambers 54 and 56 with which the interiors of the tubes 34 and 36, respectively, communicate through the perforations at 4I.
The tube 36 discharges exhaust gases from the inlet tube 26 into the expansion and resonator chamber 58 defined between the head 42 and the baille 6I] with which the tube 40 has a slip fit at 62. Restricted openings 64 in the head 42 places the chamber 58 in compound arrangement with the chambers 54 and 56.
Expanded gases from the chamber 56 flow in the tube 34 in counterdirection to the gas flow in the tube 36 into the secondary expansion chamber 66 from which the expanded and sound attenuated gases are conducted by the tube 46 to the outlet 28. Further sound attenuation takes place as the gases flow through the tube 40 as a result of the embracing acoustic chamber 46 and the enlarged lower frequency chamber 68 defined between the baille 60 and the head 24. Elongated slots 10 provide communication be tween the interior of the tube 40 and the chamber 68, being preferred to the arch type of perforation 4I at this particular point.
It will be understood that where reference is made to expansion of gases such expansion will also be accompanied by a contraction of volume due to cooling which will, likewise, assist in reducing back pressures. In practice the diameter of the tube 40 may be less than the tubes 34 and 36, if desired.
Having thus described my invention what I claim as new and desire to protect by Letters Patent is:
A muler comprising an outer casing having heads at opposite ends including an inlet and an outlet, a pair of expansion chambers located in said casing, a retroverted gas flow unit disposed in said casing and located between said chambers, said unit including three tubes, one of which conducts gases from said inlet across one of said expansion chambers and discharges the gases into said other expansion chamber, another of said tubes conducting gases between said expansion chambers, and the third of said tubes conducting gases from the first of said expansion chambers across the second of said expansion chambers to said outlet, sound attenuation chambers embracing said tubes between said expansion chambers, openings defined in the Wall of said tubes within the area embraced by said sound attenuation chambers to acoustically connect the interior of said tubes with the interior of said sound attenuation chambers, a transverse wall common to and constituting one of the end walls for each of said sound attenuation chambers and also defining one of the end walls of one of said expansion chambers, and openings defined in said transverse wall to bring said last mentioned expansion chamber and said sound attenuation chambers into compound acoustic arrangement with each other through said transverse wall.
BEECHER B. CARY.
References Cited in the iile of this patent UNITED STATES PATENTS Number Name Date 1,964,996 Oldberg July 3, 1934 2,018,084 Oldberg Sept. 24, 1934 2,357,791 Powers Sept. 5, 1944 2,520,756 Bryant a Aug. 29, 1950V FOREIGN PATENTS Number Country Date `126,776 yAustralia. Feb. 26a, 1948A
US181124A 1950-08-24 1950-08-24 Retroverted passage type muffler with expansion chambers Expired - Lifetime US2652128A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800973A (en) * 1952-11-29 1957-07-30 Gen Motors Corp Retroverted flow muffler
US2814097A (en) * 1954-12-31 1957-11-26 Waldes Kohinoor Inc Apparatus for applying spring retaining rings to shafts, pins and the like
US2835336A (en) * 1953-07-15 1958-05-20 Oldberg Mfg Company Silencer or muffler
US2928492A (en) * 1954-06-18 1960-03-15 Nelson Muffler Corp Exhaust muffler
US2930440A (en) * 1957-09-30 1960-03-29 Gen Motors Corp Exhaust system
US2950777A (en) * 1956-08-01 1960-08-30 Oldberg Mfg Company Silencer or muffler
US2958389A (en) * 1957-04-08 1960-11-01 Oldberg Mfg Company Silencer or muffler
US2998093A (en) * 1955-04-01 1961-08-29 Walker Mfg Co Automotive muffler
US3036655A (en) * 1957-10-04 1962-05-29 Walter Mfg Company Muffler
US3103256A (en) * 1959-11-09 1963-09-10 Oldberg Mfg Company Silencer or muffler
US3209858A (en) * 1963-06-25 1965-10-05 Walker Mfg Co Muffler having depressed channel forming tuning passages
US3469653A (en) * 1967-02-13 1969-09-30 Arvin Ind Inc Muffler
US20050252713A1 (en) * 2004-05-17 2005-11-17 Calsonic Kansei Corporation Shell main body for muffler
US20070125594A1 (en) * 2005-12-01 2007-06-07 Hill William E Muffler assembly with sound absorbing member

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1964996A (en) * 1933-09-21 1934-07-03 Oldberg Mfg Company Silencer
US2018084A (en) * 1934-09-24 1935-10-22 Oldberg Sidney Silencer
US2357791A (en) * 1941-03-24 1944-09-05 Walker Mfg Company Of Wisconsi Silencer
US2520756A (en) * 1945-12-03 1950-08-29 Nelson Muffler Corp Exhaust silencer for internalcombustion engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1964996A (en) * 1933-09-21 1934-07-03 Oldberg Mfg Company Silencer
US2018084A (en) * 1934-09-24 1935-10-22 Oldberg Sidney Silencer
US2357791A (en) * 1941-03-24 1944-09-05 Walker Mfg Company Of Wisconsi Silencer
US2520756A (en) * 1945-12-03 1950-08-29 Nelson Muffler Corp Exhaust silencer for internalcombustion engines

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800973A (en) * 1952-11-29 1957-07-30 Gen Motors Corp Retroverted flow muffler
US2835336A (en) * 1953-07-15 1958-05-20 Oldberg Mfg Company Silencer or muffler
US2928492A (en) * 1954-06-18 1960-03-15 Nelson Muffler Corp Exhaust muffler
US2814097A (en) * 1954-12-31 1957-11-26 Waldes Kohinoor Inc Apparatus for applying spring retaining rings to shafts, pins and the like
US2998093A (en) * 1955-04-01 1961-08-29 Walker Mfg Co Automotive muffler
US2950777A (en) * 1956-08-01 1960-08-30 Oldberg Mfg Company Silencer or muffler
US2958389A (en) * 1957-04-08 1960-11-01 Oldberg Mfg Company Silencer or muffler
US2930440A (en) * 1957-09-30 1960-03-29 Gen Motors Corp Exhaust system
US3036655A (en) * 1957-10-04 1962-05-29 Walter Mfg Company Muffler
US3103256A (en) * 1959-11-09 1963-09-10 Oldberg Mfg Company Silencer or muffler
US3209858A (en) * 1963-06-25 1965-10-05 Walker Mfg Co Muffler having depressed channel forming tuning passages
US3469653A (en) * 1967-02-13 1969-09-30 Arvin Ind Inc Muffler
US20050252713A1 (en) * 2004-05-17 2005-11-17 Calsonic Kansei Corporation Shell main body for muffler
US7293628B2 (en) * 2004-05-17 2007-11-13 Calsonic Kansei Corporation Shell main body for muffler
US20070125594A1 (en) * 2005-12-01 2007-06-07 Hill William E Muffler assembly with sound absorbing member

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