WO1993011347A1 - Muffler - Google Patents

Muffler Download PDF

Info

Publication number
WO1993011347A1
WO1993011347A1 PCT/NZ1992/000001 NZ9200001W WO9311347A1 WO 1993011347 A1 WO1993011347 A1 WO 1993011347A1 NZ 9200001 W NZ9200001 W NZ 9200001W WO 9311347 A1 WO9311347 A1 WO 9311347A1
Authority
WO
WIPO (PCT)
Prior art keywords
muffler
valve
baffle tube
shut
casing
Prior art date
Application number
PCT/NZ1992/000001
Other languages
French (fr)
Inventor
Graeme Charles Stephens
Original Assignee
Graeme Charles Stephens
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Graeme Charles Stephens filed Critical Graeme Charles Stephens
Publication of WO1993011347A1 publication Critical patent/WO1993011347A1/en

Links

Classifications

    • 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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/166—Silencing apparatus characterised by method of silencing by using movable parts for changing gas flow path through the silencer or for adjusting the dimensions of a chamber or a pipe

Definitions

  • This invention relates to an exhaust system and particularly to an exhaust system for an internal combustion engine.
  • exhaust flow is a compromise between a range of engine operating conditions, for example, noise emission, fuel economy and power output.
  • An object of the invention is to provide a muffler which overcomes the above identified problem.
  • a further object of the present invention is to provide an exhaust flow tailored to engine demand to provide a degree of control over noise emission and power output and to offer a consumer a useful alternative choice.
  • a muffler for an internal combustion engine including a casing in which a perforated or louvred baffle tube is mounted, the baffle tube having a shut-off valve therein so that the flow of exhaust gases can be directed straight through the baffle tube with the shut-off valve open or diverted through the perforations or louvres to increase the muffling effect and to slow the flow of gases through the muffler when the shut-off valve is closed or partly closed.
  • the shut-off valve can be any flap valve, butterfly valve, vane or means for restricting the cross sectional area of the baffle tube.
  • the casing can be cylindrical, megaphone or any other suitable shape.
  • An area between the casing and the baffle tube can be packed with sound absorbing material and/or gas flow controlling material.
  • the density of the material controls the amount of sound absorbtion and/or restriction to the gas flow.
  • the area between the casing and the baffle tube can also be used for other flow or sound devices.
  • the baf le tube can be a through-pipe extending from an inlet to an outlet of the casing and can extend from the inlet part of the way to the outlet.
  • the baffle tube can extend from the outlet part of the way to the inlet.
  • the position of the shut-off valve can be controlled manually, mechanically or electronically.
  • Figure 1 shows a diagrammatic section through an example of the muffler according to the invention
  • Figure 2 is a diagrammatic section of an inlet region of the muffler shown in Figure 1;
  • Figure 3 is a diagrammatic sectio ' of a shut-off valve assembly for the muffler shown in Figures 1 and 2;
  • Figure 4 is a diagrammatic section through an example of the muffler according to the invention with an adjustable shut- off valve operable from a position remote from the muffler.
  • the muffler 1 shown in Figure 1 has an inlet connecting tube 2 the end of which 3 is adapted for connection to an outlet tube (not shown) of an internal combustion engine.
  • the other end of the connecting tube 2 is connected to one end of a casing or body 4 of the muffler 1.
  • An outlet tube 5 is connected to the other end of the casing or body 4.
  • the casing or body 4 has a baffle tube 6 mounted therein.
  • the baffle tube 6 can extend only part of the length of the connecting tube 2 towards the outlet tube 5, for example about half to three quarters of the length of the casing or body 4.
  • the baffle tube 6 is perforated or louvred 7 along at least part of its length.
  • the baffle tube 6 has mounted therein a shut-off valve 8 which is part of an adjustable valve assembly 15 illustrated in Figure 3.
  • the valve assembly 15 can be mounted at any position along the baffle tube 6.
  • FIG. 2 is shown an inlet connecting tube 2 welded to an end cap 10.
  • the flared end 14 is attached to the perforated or louvred baffle tube 6.
  • the end 14 can optionally be straight or tapered.
  • the baffle tube 6 can be mounted concentric with or offset from the centre of the casing or body 4.
  • the end cap 10 is attached by suitable means to the inlet connecting tube 2 to secure it in place.
  • the adjustable valve assembly 15 illustrated in Figure 3 comprises a valve which in the example illustrated is a butterfly valve 8.
  • This butterfly valve is secured to a hollow shaft 9 which is inserted into holes drilled through the baffle tube 6. From the end 11 of the hollow shaft 9 projects a grub screw 16.
  • a nut 13 is fitted on the grub screw 16 and is secured to the shaft 9 and the grub screw 16 by welds or other means.
  • To lock the valve 8 in position a lock nut 12 is screwed down the grub screw 16 and tightened, pinching the casing 4 between the nut 13 and the lock nut 12 to create a relatively gas-tight seal.
  • the valve is mounted directly into the baffle tube or optionally into a sleeve 17 fitted to the baffle tube 6.
  • the position of the valve relative to the baffle tube 6 can be adjusted manually, mechanically or electronically by means (not shown) to enable the valve to be moved from a closed position to an open position or to any intermediate position.
  • the annular space 20 can be packed with sound absorbing and/or flow controlling material in such quantities and combinations as are necessary to optimize noise reduction and flow control for the type of engine onto which the muffler is to be fitted.
  • Figure 4 illustrates a diagrammatic section illustrating a remotely controlled shut-off valve.
  • valve 8 is able to be controlled remotely from the muffler 1.
  • One end of the hollow shaft 9 is attached to a lever 19 which is connected to suitable control means (not shown) which enables the valve to be opened or closed to suit a user's requirements and the type of engine to which the muffler is to be fitted.
  • suitable control means not shown
  • an automatic control from the engine to the muffler may be used to vary the flow of exhaust gases according to the needs of the engine. It is envisaged that a computer and/or electrical circuit will eventually control the movement of the valve.
  • the muffler can be constructed having a variety of lengths and taper angles to suit the characteristics of the engine to which the muffler is to be fitted.

Landscapes

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

Abstract

A muffler (1) has an outer casing (4) within which a perforated baffle tube (6) is mounted, the baffle tube (6) having a shut-off valve (8) positioned therein so that the flow of exhaust gases (18) can be directed straight through the baffle tube (6) with the shut-off valve (8) open or diverted through the perforations (7) with the shut-off valve (8) closed or partly closed to increase the muffling effect and to slow the flow of gases through the muffler (1).

Description

MUFFLER
This invention relates to an exhaust system and particularly to an exhaust system for an internal combustion engine.
At present a range of mufflers are available for internal combustion engines. They are mainly incorporated as an aid to reducing noise pollution, while maintaining a desired back pressure on the engine to ensure optimum fuel throughput and efficiency.
In some conditions, for example, while racing, it is desirable to change the characteristics of a muffler to suit the modified engine operating requirements.
Presently exhaust flow is a compromise between a range of engine operating conditions, for example, noise emission, fuel economy and power output.
An object of the invention is to provide a muffler which overcomes the above identified problem.
A further object of the present invention is to provide an exhaust flow tailored to engine demand to provide a degree of control over noise emission and power output and to offer a consumer a useful alternative choice.
According to the invention there is provided a muffler for an internal combustion engine, the muffler including a casing in which a perforated or louvred baffle tube is mounted, the baffle tube having a shut-off valve therein so that the flow of exhaust gases can be directed straight through the baffle tube with the shut-off valve open or diverted through the perforations or louvres to increase the muffling effect and to slow the flow of gases through the muffler when the shut-off valve is closed or partly closed.
The shut-off valve can be any flap valve, butterfly valve, vane or means for restricting the cross sectional area of the baffle tube.
The casing can be cylindrical, megaphone or any other suitable shape.
An area between the casing and the baffle tube can be packed with sound absorbing material and/or gas flow controlling material. The density of the material controls the amount of sound absorbtion and/or restriction to the gas flow. The area between the casing and the baffle tube can also be used for other flow or sound devices.
The baf le tube can be a through-pipe extending from an inlet to an outlet of the casing and can extend from the inlet part of the way to the outlet. Alternatively the baffle tube can extend from the outlet part of the way to the inlet.
The position of the shut-off valve can be controlled manually, mechanically or electronically.
Further aspects of the invention which should be considered in all its novel aspects will become apparent from the following descriptions which are given by way of example only.
Examples of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 shows a diagrammatic section through an example of the muffler according to the invention; Figure 2 is a diagrammatic section of an inlet region of the muffler shown in Figure 1;
Figure 3 is a diagrammatic sectio 'of a shut-off valve assembly for the muffler shown in Figures 1 and 2; and
Figure 4 is a diagrammatic section through an example of the muffler according to the invention with an adjustable shut- off valve operable from a position remote from the muffler.
The muffler 1 shown in Figure 1 has an inlet connecting tube 2 the end of which 3 is adapted for connection to an outlet tube (not shown) of an internal combustion engine. The other end of the connecting tube 2 is connected to one end of a casing or body 4 of the muffler 1. An outlet tube 5 is connected to the other end of the casing or body 4.
The casing or body 4 has a baffle tube 6 mounted therein. Alternatively (not shown) the baffle tube 6 can extend only part of the length of the connecting tube 2 towards the outlet tube 5, for example about half to three quarters of the length of the casing or body 4.
The baffle tube 6 is perforated or louvred 7 along at least part of its length. The baffle tube 6 has mounted therein a shut-off valve 8 which is part of an adjustable valve assembly 15 illustrated in Figure 3. The valve assembly 15 can be mounted at any position along the baffle tube 6.
In Figure 2 is shown an inlet connecting tube 2 welded to an end cap 10. The flared end 14 is attached to the perforated or louvred baffle tube 6. The end 14 can optionally be straight or tapered. The baffle tube 6 can be mounted concentric with or offset from the centre of the casing or body 4. The end cap 10 is attached by suitable means to the inlet connecting tube 2 to secure it in place.
The adjustable valve assembly 15 illustrated in Figure 3 comprises a valve which in the example illustrated is a butterfly valve 8. This butterfly valve is secured to a hollow shaft 9 which is inserted into holes drilled through the baffle tube 6. From the end 11 of the hollow shaft 9 projects a grub screw 16. A nut 13 is fitted on the grub screw 16 and is secured to the shaft 9 and the grub screw 16 by welds or other means. To lock the valve 8 in position a lock nut 12 is screwed down the grub screw 16 and tightened, pinching the casing 4 between the nut 13 and the lock nut 12 to create a relatively gas-tight seal.
To move the valve 8 from its open position to its closed position an Allen key is inserted in the grub screw 16 to turn the shaft 9.
The valve is mounted directly into the baffle tube or optionally into a sleeve 17 fitted to the baffle tube 6.
In use the position of the valve relative to the baffle tube 6 can be adjusted manually, mechanically or electronically by means (not shown) to enable the valve to be moved from a closed position to an open position or to any intermediate position.
In its closed position the flow of exhaust gases is in the direction of arrow 18 through the perforations at the inlet end of the casing 4 and to an annular space 20, formed between the baffle tube and the casing before the gases re-enter the baffle tube 6 and pass from the outlet 5.
The annular space 20 can be packed with sound absorbing and/or flow controlling material in such quantities and combinations as are necessary to optimize noise reduction and flow control for the type of engine onto which the muffler is to be fitted.
In its open position the back pressure at the exhaust manifold is reduced and the flow of gases is directed through the baffle tube and past the valve.
Figure 4 illustrates a diagrammatic section illustrating a remotely controlled shut-off valve.
In this example the valve 8 is able to be controlled remotely from the muffler 1. One end of the hollow shaft 9 is attached to a lever 19 which is connected to suitable control means (not shown) which enables the valve to be opened or closed to suit a user's requirements and the type of engine to which the muffler is to be fitted. Alternatively an automatic control from the engine to the muffler may be used to vary the flow of exhaust gases according to the needs of the engine. It is envisaged that a computer and/or electrical circuit will eventually control the movement of the valve.
The muffler can be constructed having a variety of lengths and taper angles to suit the characteristics of the engine to which the muffler is to be fitted.
Thus by this invention there is provided a muffler for an internal combustion engine. Particular examples of this invention have been described and it is envisaged that improvements and modifications can take place without departing from the scope of the appended claims.

Claims

CLAIMS ;
1. A muffler including a casing in which a perforated or louvred baffle tube is mounted, the baffle tube having a shut- off valve therein so that the flow of exhaust gases can be directed straight through the baffle tube with the shut-off valve open or diverted through the perforations or louvres to increase the muffling effect and to slow the flow of gases through the muffler when the shut-off valve is closed or partly closed.
2. A muffler as claimed in claim 1 wherein the amount of restriction in the baffle tube can be varied by altering the position of the shut-off valve.
3. A muffler as claimed in claims 1 or 2 wherein the shut-off valve can be any flap valve, butterfly valve, vane or means of restricting the cross-sectional diameter of the baffle tube.
4. A muffler as claimed in any one of claims 1 to 3 wherein the shut-off valve is controlled manually, mechanically or electronicall .
5. A muffler as claimed in any one of the preceding claims wherein the area between the casing and the baffle tube is at least partly packed with sound absorbing material and/or gas flow controlling material.
6. A muffler as claimed in any one of the preceding claims wherein the length and diameter of the baffle tube can be altered.
7. A muffler as claimed in any one of the preceding claims wherein the position of the baffle tube can be altered.
8. A muffler as claimed in any one of the preceding claims wherein the baffle is mounted centrally or offset from centre.
9. A muffler as claimed in any one of the preceding claims 1 to 8 wherein the casing is conical or megaphone shaped.
10. A muffler substantially as hereinbefore described with reference to the accompanying drawings.
PCT/NZ1992/000001 1991-12-04 1992-12-04 Muffler WO1993011347A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ240672 1991-12-04
NZ24067291A NZ240672A (en) 1991-12-04 1991-12-04 Muffler with valve controlled through passage

Publications (1)

Publication Number Publication Date
WO1993011347A1 true WO1993011347A1 (en) 1993-06-10

Family

ID=19923806

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ1992/000001 WO1993011347A1 (en) 1991-12-04 1992-12-04 Muffler

Country Status (3)

Country Link
AU (1) AU3098192A (en)
NZ (1) NZ240672A (en)
WO (1) WO1993011347A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313409A (en) * 1996-05-21 1997-11-26 Custom Chrome Limited Adjustable exhaust silencer for vehicles
WO1999025962A1 (en) * 1997-11-14 1999-05-27 Volvo Personvagnar Ab Device and method for sound-attenuating units
WO2001018365A1 (en) * 1999-09-06 2001-03-15 Volvo Personvagnar Ab Arrangement at a silencer and method for reduction of noise from a gas flow
DE10030490A1 (en) * 2000-06-21 2002-01-03 Porsche Ag Exhaust gas system for internal combustion engine has control flap on main gas pipe in interior cavity preferably adjacent to entry side of casing
EP1191194A2 (en) * 2000-09-20 2002-03-27 Calsonic Kansei Corporation Valve for a control muffler
GB2382377A (en) * 2001-11-06 2003-05-28 Lloyd Simmons Engine exhaust silencer, eg for motorcycles, with selectable direct and indirect flow paths
WO2012030222A1 (en) * 2010-09-02 2012-03-08 The Jekill & Hyde Company B.V. Exhaust, valve housing, motorized vehicle, and method of mounting

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497714A (en) * 1921-01-28 1924-06-17 American Telephone & Telegraph Secret-communication system
US1553264A (en) * 1923-12-12 1925-09-08 Reasonover John Roy Muffler
US1781001A (en) * 1927-10-05 1930-11-11 Chrysler Corp Muffler
US1840082A (en) * 1927-05-28 1932-01-05 Chrysler Corp Muffler
US1860892A (en) * 1929-04-11 1932-05-31 Emmet P Gray Muffler
US2072372A (en) * 1934-02-23 1937-03-02 Riethmiller Ruth Exhaust system for automotive engines
US2404589A (en) * 1944-12-27 1946-07-23 Higgins Ind Inc Muffler for marine power plants
US3154174A (en) * 1962-11-30 1964-10-27 Alvin S Haining Dual purpose muffler with valved by-pass means
AU5286473A (en) * 1973-03-02 1974-09-05 ray T. FLUEGER, ROBERT W. MACKEY and STEEL-GRIP MANUFACTURING CO., INC Automotive muffler

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497714A (en) * 1921-01-28 1924-06-17 American Telephone & Telegraph Secret-communication system
US1553264A (en) * 1923-12-12 1925-09-08 Reasonover John Roy Muffler
US1840082A (en) * 1927-05-28 1932-01-05 Chrysler Corp Muffler
US1781001A (en) * 1927-10-05 1930-11-11 Chrysler Corp Muffler
US1860892A (en) * 1929-04-11 1932-05-31 Emmet P Gray Muffler
US2072372A (en) * 1934-02-23 1937-03-02 Riethmiller Ruth Exhaust system for automotive engines
US2404589A (en) * 1944-12-27 1946-07-23 Higgins Ind Inc Muffler for marine power plants
US3154174A (en) * 1962-11-30 1964-10-27 Alvin S Haining Dual purpose muffler with valved by-pass means
AU5286473A (en) * 1973-03-02 1974-09-05 ray T. FLUEGER, ROBERT W. MACKEY and STEEL-GRIP MANUFACTURING CO., INC Automotive muffler

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313409A (en) * 1996-05-21 1997-11-26 Custom Chrome Limited Adjustable exhaust silencer for vehicles
WO1999025962A1 (en) * 1997-11-14 1999-05-27 Volvo Personvagnar Ab Device and method for sound-attenuating units
US6564902B1 (en) 1997-11-14 2003-05-20 Volvo Personvagnar Ab Device and method for a sound-attenuating unit
WO2001018365A1 (en) * 1999-09-06 2001-03-15 Volvo Personvagnar Ab Arrangement at a silencer and method for reduction of noise from a gas flow
DE10030490A1 (en) * 2000-06-21 2002-01-03 Porsche Ag Exhaust gas system for internal combustion engine has control flap on main gas pipe in interior cavity preferably adjacent to entry side of casing
DE10030490B4 (en) * 2000-06-21 2005-07-21 Dr.Ing.H.C. F. Porsche Ag Exhaust system for an internal combustion engine
EP1191194A2 (en) * 2000-09-20 2002-03-27 Calsonic Kansei Corporation Valve for a control muffler
EP1191194A3 (en) * 2000-09-20 2003-11-26 Calsonic Kansei Corporation Valve for a control muffler
GB2382377A (en) * 2001-11-06 2003-05-28 Lloyd Simmons Engine exhaust silencer, eg for motorcycles, with selectable direct and indirect flow paths
WO2012030222A1 (en) * 2010-09-02 2012-03-08 The Jekill & Hyde Company B.V. Exhaust, valve housing, motorized vehicle, and method of mounting

Also Published As

Publication number Publication date
AU3098192A (en) 1993-06-28
NZ240672A (en) 1995-10-26

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