EP0150899A2 - Exhaust system - Google Patents

Exhaust system Download PDF

Info

Publication number
EP0150899A2
EP0150899A2 EP85300042A EP85300042A EP0150899A2 EP 0150899 A2 EP0150899 A2 EP 0150899A2 EP 85300042 A EP85300042 A EP 85300042A EP 85300042 A EP85300042 A EP 85300042A EP 0150899 A2 EP0150899 A2 EP 0150899A2
Authority
EP
European Patent Office
Prior art keywords
reverse type
shell
type silencer
silencer
openings
Prior art date
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.)
Withdrawn
Application number
EP85300042A
Other languages
German (de)
French (fr)
Other versions
EP0150899A3 (en
Inventor
Richard Dehane Schultz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EXHAUST INTERNATIONAL (PROPRIETARY) LIMITED
Original Assignee
Exhaust International Pty Ltd
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 Exhaust International Pty Ltd filed Critical Exhaust International Pty Ltd
Publication of EP0150899A2 publication Critical patent/EP0150899A2/en
Publication of EP0150899A3 publication Critical patent/EP0150899A3/en
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • 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
    • 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
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with 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
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • 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
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow

Definitions

  • This invention relates to an exhaust system and particularly to a reverse type silencer for an exhaust system.
  • Reverse type silencers are so well known and in all these types of silencers there is a reversal of the flow of direction of gases to obtain dampening of noise.
  • a reverse type silencer includes a core in a shell, the core comprising a pair of cylindrical portions, the first portion having openings flanking the second portion and the second portion having openings facing rearwardly having regard to the flow of exhaust gas, and flanking the first portion.
  • the shell has a curved termination and the second portion extends through the termination.
  • the curved termination may be convex or concave.
  • the ends of the two portions are preferably pinched (without losing any effective area), placed end to end, rotated through a right angle and the two pressed into each other by means of the provision of suitable slots.
  • the centre of the core has a restriction substantially in the form of a cross, but other shapes may be formed depending on the degree of pinching.
  • Gases and sound waves entering the silencer of the invention have two routes - a first route through the centre of the core where they encounter the restriction, (which also causes a reduction in sound energy by altering the impedance of the system) and a second route through the flanking , openings from where they impinge on the curved termination, the reflected gases and waves then moving reardwardly to impinge against the opposite wall of the silencer and the gases from there passing into the second portion of the core and then to atmosphere.
  • the reflected sound waves are reflected from a number of different points on the curved rear portion and therefore attenuate the oncoming waves both as to angle and as to phase. Some of the reflected waves are transmitted through the opposite wall which may separate the silencer of the invention from a primary silencer.
  • a primary silencer comprising a cylindrical body in a shell, the body having a plurality of open notches in its surface.
  • the space between the cylindrical body and the shell may be filled with sound absorbing material such as glass or ceramic fibres.
  • the notches may be of any shape, but are preferably cut transversely and a curved portion pressed into the surface to cnstitute a downwardly-depending lip, either forwardly or rearwardly.
  • the notches in a particular manner are grouped and are arranged in the form of a number of spirals longitudinally of the body. This arrangement ensures that portions of wavelengths or groups of wavelengths of sound are collected by at least one or a group of notches, whence the waves pass into the sound absorbing material to be absorbed in part and, in some and often most cases, become out of phase when reflected back into the body, thereby attenuating or altering the wave pattern of incoming waves.
  • the spiral formation also causes a reduction in turbulence at high gas velocities.
  • the reverse type silencer section of a combined resonance/reverse silencer is indicated by reference 10 and comprises a pair of cylindrical portions 12,14, the meeting ends of which are pinched as shown and overlap as shown, slots having been provided for this purpose.
  • a resonance type silencer section indicated by reference 20 which has a core 22 including a plurality of open notches 24 arranged spirally.
  • a shell 26 is provided for this section of the silencer.
  • the shell 30 of the reverse type silencer section has a curved termination 32, formed by crimping the end of the cylinder forming it.
  • the curve may be concave or convex.
  • the reflected gases and sound waves then move rearwardly at a number of angles, some of the gases finding their way through the openings 18 and thence to atmosphere.
  • the reflected sound waves attenuate some of the incoming sound waves, and others impinge on the diaphragm 40 between the two sections of the combined silencer, and are transmitted through the diaphragm to this section, where they are dampened.
  • the core is enclosed in a shell 26, the space between the core and shell being filled with a sound absorbing material such as glass or ceramic fibres or the like.
  • the shell 26 may be integral with shell 30.

Landscapes

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

Abstract

® A reverse type silencer (10) comprises a pair of cylindrical portions (12, 14) in which their meeting ends are pinched and overlapped. A resonance silencer (12) is located behind the silencer (10) and has a plurality of notches (24) arranged spirally. Shells (26, 30) are provided for the silencer. Sound waves entering into the silencer are reflected and attenuated resulting in dampening of noise before emission.

Description

    FIELD OF THE INVENTION
  • This invention relates to an exhaust system and particularly to a reverse type silencer for an exhaust system.
    • BACKGROUND OF THE INVENTION
  • Reverse type silencers are so well known and in all these types of silencers there is a reversal of the flow of direction of gases to obtain dampening of noise.
  • It is an object of the present invention to provide a novel reverse type silencer which is more efficient than prior art silencers of the same type.
    • THE INVENTION
  • According to the invention a reverse type silencer includes a core in a shell, the core comprising a pair of cylindrical portions, the first portion having openings flanking the second portion and the second portion having openings facing rearwardly having regard to the flow of exhaust gas, and flanking the first portion.
  • In a preferred form of the invention the shell has a curved termination and the second portion extends through the termination. The curved termination may be convex or concave.
  • The ends of the two portions are preferably pinched (without losing any effective area), placed end to end, rotated through a right angle and the two pressed into each other by means of the provision of suitable slots.
  • As a result of this construction the centre of the core has a restriction substantially in the form of a cross, but other shapes may be formed depending on the degree of pinching.
  • Gases and sound waves entering the silencer of the invention have two routes - a first route through the centre of the core where they encounter the restriction, (which also causes a reduction in sound energy by altering the impedance of the system) and a second route through the flanking , openings from where they impinge on the curved termination, the reflected gases and waves then moving reardwardly to impinge against the opposite wall of the silencer and the gases from there passing into the second portion of the core and then to atmosphere.
  • The reflected sound waves are reflected from a number of different points on the curved rear portion and therefore attenuate the oncoming waves both as to angle and as to phase. Some of the reflected waves are transmitted through the opposite wall which may separate the silencer of the invention from a primary silencer.
  • According further to the invention there is provided a primary silencer comprising a cylindrical body in a shell, the body having a plurality of open notches in its surface.
  • The space between the cylindrical body and the shell may be filled with sound absorbing material such as glass or ceramic fibres.
  • The notches may be of any shape, but are preferably cut transversely and a curved portion pressed into the surface to cnstitute a downwardly-depending lip, either forwardly or rearwardly.
  • In a preferred form of the invention the notches in a particular manner are grouped and are arranged in the form of a number of spirals longitudinally of the body. This arrangement ensures that portions of wavelengths or groups of wavelengths of sound are collected by at least one or a group of notches, whence the waves pass into the sound absorbing material to be absorbed in part and, in some and often most cases, become out of phase when reflected back into the body, thereby attenuating or altering the wave pattern of incoming waves.
  • The spiral formation also causes a reduction in turbulence at high gas velocities.
    • EMBODIMENT OF THE INVENTION
  • An embodiment of the invention is described below with reference to the accompanying drawing which is an exploded perspective view of a silencer according to the invention.
  • In the drawing the reverse type silencer section of a combined resonance/reverse silencer is indicated by reference 10 and comprises a pair of cylindrical portions 12,14, the meeting ends of which are pinched as shown and overlap as shown, slots having been provided for this purpose.
  • Behind the reverse type silencer section is a resonance type silencer section indicated by reference 20 which has a core 22 including a plurality of open notches 24 arranged spirally. A shell 26 is provided for this section of the silencer.
  • The shell 30 of the reverse type silencer section has a curved termination 32, formed by crimping the end of the cylinder forming it. The end of portion 12 extending through the orifice 34 in the shell 30. The curve may be concave or convex.
  • The pinching of the portions 12,14 results in the formation of openings 16 in portion 12 and 18 on portion 14, these openings flanking the respective portions. As mentioned above the exhaust gases and sound waves entering this section of the combined silencer have two routes - a first route through the centre of the two portions where the pinching causes the formation of a restriction in the form of a cross or other shape and a second route through the flanking openings from where the gases and the sound waves impinge on the curved termination 32.
  • The reflected gases and sound waves then move rearwardly at a number of angles, some of the gases finding their way through the openings 18 and thence to atmosphere. The reflected sound waves attenuate some of the incoming sound waves, and others impinge on the diaphragm 40 between the two sections of the combined silencer, and are transmitted through the diaphragm to this section, where they are dampened.
  • In the section 20, the core is enclosed in a shell 26, the space between the core and shell being filled with a sound absorbing material such as glass or ceramic fibres or the like. The shell 26 may be integral with shell 30.
  • The features disclosed in the foregoing description, in the following claims and/or in the accompanying drawings may, both separately and in any combination thereof, be material for realising the invention in diverse forms thereof.

Claims (7)

1. A reverse type silencer characterised in including a core in a shell, the core comprising a pair of cylindrical portions, the first portion having openings flanking the second portion and the second portion having openings facing rearwardly having regard to the flow of exhaust gas, and flanking the first portion.
2. A reverse type silencer according to claim 1 characterised in that the shell has a curved termination and the second .portion extends through the termination.
3. A reverse type silencer according to claim 1 to claim 2 characterised in that the adjacent ends of the first and second portions are pinched, placed end to end, rotated through a right angle and pressed into each other to form a substantially cross configuration at the join between the first and second portions.
v 4. A reverse type silencer according to claim 3 characterisec in that the opening in the first portion is formed at its extremity and the openings in the second portion are arranged in the form of spirals distributed longitudinally of the body.
5. A reverse type silencer according to any one of claims 1 to 4 characterised in including a primary silencer comprising a cylindrical body in a shell, and the body having a plurality of open notches in its surface.
6. A reverse type silencer according to claim 5 characterised in that the cylindrical body and the shell are filled with sound absorbing material such as glass or ceramic fibres.
7. A reverse type silencer substantially as herein described with reference to the accompanying drawing.
EP85300042A 1984-01-04 1985-01-03 Exhaust system Withdrawn EP0150899A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA840051 1984-01-04
ZA8451 1984-01-04

Publications (2)

Publication Number Publication Date
EP0150899A2 true EP0150899A2 (en) 1985-08-07
EP0150899A3 EP0150899A3 (en) 1985-08-21

Family

ID=25577090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85300042A Withdrawn EP0150899A3 (en) 1984-01-04 1985-01-03 Exhaust system

Country Status (3)

Country Link
EP (1) EP0150899A3 (en)
JP (1) JPS60228719A (en)
CA (1) CA1231898A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR49204E (en) * 1937-07-31 1938-12-07 Improvements in the construction of silencers for internal combustion engines and the like
US4140204A (en) * 1977-08-01 1979-02-20 Gator Products, Inc. Two-tube muffler and method of manufacture
US4278147A (en) * 1979-02-08 1981-07-14 Kawasaki Jukogyo Kabushiki Kaisha Muffler for engine, particularly motorcycle engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR49204E (en) * 1937-07-31 1938-12-07 Improvements in the construction of silencers for internal combustion engines and the like
US4140204A (en) * 1977-08-01 1979-02-20 Gator Products, Inc. Two-tube muffler and method of manufacture
US4278147A (en) * 1979-02-08 1981-07-14 Kawasaki Jukogyo Kabushiki Kaisha Muffler for engine, particularly motorcycle engine

Also Published As

Publication number Publication date
EP0150899A3 (en) 1985-08-21
JPS60228719A (en) 1985-11-14
CA1231898A (en) 1988-01-26

Similar Documents

Publication Publication Date Title
US4342195A (en) Motorcycle exhaust system
US4574914A (en) Compact, sound-attenuating muffler for high-performance, internal combustion engine
US4809812A (en) Converging, corridor-based, sound-attenuating muffler and method
US4361206A (en) Exhaust muffler including venturi tube
US5173577A (en) Stamp formed muffler with low back pressure
US4424882A (en) Resonator type mufflers
US3710891A (en) Automotive muffler
US6286623B1 (en) Sound-attenuating muffler for internal combustion engine
EP0127807A2 (en) Silencer device for exhaust gases in particular, and for fast-moving gases in general
EP1015739B1 (en) Noise attenuating apparatus
US4203502A (en) Muffler
US3966015A (en) Silencer element
US4109752A (en) Muffler
CA2123776C (en) Narrow width stamp formed muffler
US11661870B2 (en) Timbre scaled exhaust system
US6776257B1 (en) Sound-attenuating muffler having reduced back pressure
EP0150899A2 (en) Exhaust system
US6296074B1 (en) Noise reducing exhaust system and method
US4000786A (en) Marine muffler
EP0151507B1 (en) Exhaust system
US4623035A (en) Muffler of the sound reflecting type for use with internal combustion engines
EP0389401A1 (en) Silencer for automobile exhaust systems
SU985343A1 (en) Multisection noise silencer
KR102605043B1 (en) Engine exhaust pipe having exhaust noise reducing function
CA1245566A (en) Compact, sound-attenuating muffler for high- performance, internal combustion engine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: EXHAUST INTERNATIONAL (PROPRIETARY) LIMITED

17P Request for examination filed

Effective date: 19860131

17Q First examination report despatched

Effective date: 19860731

D17Q First examination report despatched (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890801

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHULTZ, RICHARD DEHANE