CA1040105A - Exhaust muffler - Google Patents
Exhaust mufflerInfo
- Publication number
- CA1040105A CA1040105A CA243,506A CA243506A CA1040105A CA 1040105 A CA1040105 A CA 1040105A CA 243506 A CA243506 A CA 243506A CA 1040105 A CA1040105 A CA 1040105A
- Authority
- CA
- Canada
- Prior art keywords
- header pipe
- inlet
- housing
- outlet
- chamber
- 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.)
- Expired
Links
Abstract
Disclosed herein is a muffler including an elongated tubular housing having a cylindrical outer wall enclosed at the opposite ends by dished end walls, an internal partition dividing the housing into an outlet chamber and an inlet chamber, and an elongated tubular header pipe extending lengthwise inside the housing and through the partition. The header pipe includes an inlet portion disposed in the outlet chamber, preferably having a plurality of small perforations through which exhaust gases enter the header pipe from the outlet chamber, and an outlet portion disposed in the inlet chamber. The exhaust gases exit to the atmosphere from the header pipe through a plurality of discharge tubes or tailpipes which are connected in communication with the outlet section of the header pipe and extend outwardly through the outer wall of the housing.
Description
S
TITLE
"EXHAUST MUFFLER"
INVENTORS
Donald K. Stephenson and Donald R. Hanson BACKGROUND OF THE INVENTION
The invention relates to exhaust mufflers for internal combustion engines and more particularly to exhaust mufflers particularly adapted for use on snowmobiles.
In order to reduce the noise eminating from vehicles powered by an internal combustion engine, particularly snowmobiles, considerable effort has been directed towards developing exhaust mufflers which are capable of attenua~ing the noise generated by the pulsating exhaust gases without substantially reducing the engine power. Prior muffler constructions are disclosed in the following United States Patents:
Smale 3,853,201 issued December 10, 1974 Betts et al 3,776,366 issued December 4, 1973 Jozepaitis 3,419,107 issued December 31, 1968 Bryant 2,960,179 issued November 15, 1960 Bryant 2,825,421 issued March 4, 1958 Bryant 2,520,756 issued August 29, 1950 Chipley 2,239,549 issued April 22, 1941 Powell 1,998,385 issued April 16, 1935 SUMMARY OF THE INVENTION
. _ ~" The invention provides a muffler comprising an elongated tubular housing having an outer wall and including an internal partition dividing the housing ~ .
,~.'.
$~ )5 into an inlet chamber and an outlet chamber, which partition includes at least one port communicating between the inlet and outlet chambers, an inlet in the housing outer wall for admitting exhaust gases into the inlet chamber, an elongated tubular header pipe disposed inside and extending lengthwise of the housing through the partition, which header pipe has an outlet portion located in the inlet chamber and an inlet portion located in and communicating with the outlet chamber, and a plurality of discharge tubes which are axially spaced on the header pipe, are connected in communication with the header pipe outlet portion,and extend outwardly through the housing outer wall.
In accordance with one embodiment of the invention, the discharge tubes have an internal cross-sectional area smaller than the internal cross-sectional area of the header pipe outlet portion.
In accordance with one embodiment of the invention, at least three discharge tubes are employed.
~; In accordance with one embodiment of the invention, the header pipe inlet portion includes a plurality of small perfora~ions through which the exhaust gases enter :
the header pipe from the outlet cham~er.
In accordance with one embodiment of the invention, the header pipe inlet portion includes an open outer end through which the exhaust gases enter the header pipe from the outlet chamber.
Other features, aspects and advantages of the embodiments of the invention will become apparent upon reviewing the following detailed description, .~ -2-~ .
the drawing, and the appended claims.
Fig. 1 is a side sectional view, partially broken away, of a muffler embodying various of the ~eatures of the invention.
Fig. 2 is a side sectional view, partially broken away, of an alternate construction of a muffler embodying various features of the invention.
Before explaining the invention in detaiL, it is to be understood that the invention is not limited in its applica-tion to the details of construction and the arrangements of the components set forth in the following description or illus-trated in the drawing. The invention is capable of other embodi-ments and of being practiced and carried out in various ways.
Also, it is to be understood that the phraseology and terminology employed herein is for the purposes of description and should not be regarded as limiting.
DESCRIPTIO~ OF THE PREFERRED EMBODIMENTS
Illustrated in the drawing is a muffler 10 which embodies various of the features of the invention and which incl~des an elongated tubular shell or housing 12 having an outer or sidewall 14. The outer wall 14 preferably is cylindrically shaped and is closed at the opposite ends by respective dished ,, end walls 16 and 18. While other arcuate shapes and arrangements can be used, the end walls 16 and 18 preferably are partially spherically shaped and are inwardly concave.
The housing 12 is divided into a first or inlet chamber 20 and a second or outlet chamber 22 by a dished internal partition 24 which preferably is located so that the length of . _ s the inlet chamber 20 is substantially longer than th~ outlet chamber 22. While in ~he specific construction illus~rated the partition is partially spherically shaped and is concave with respect to the inlet chamber 20, it can be convexed with res-pect to the inlet chamber 20 and can have an arcuate shape other than spherical.
Exhaust gases from an internal combustion engine ~not shown) are admitted into ~he inlet chamber 20 through an inlet tube or duct 26 which extends radially outwardly from the inlet chamber 20 through the housing sidewall 14 and in~ludes suitable attachment means ~not shown) for connection to the engine exhaust system. The exhaust gases flow from the inlet chamber 20 into the outlet chamber 22 through one or more ports 28 provided in the partition 24. Each port 28 preferably is integrally formed from the material of the partition 24 and includes a tubular portion 30 extending for a relatively short length from the inlet chamber 20 and into the outlet chamber 22 and has a rounded or curved mouth or inlet 32.
Extending lengthwise inside the housing 12 and through an opening 33 provided in the partition 24 is an elongated tubular member or header pipe 34 including an inlet portion 36 and an outlet portion 38 having a rlosed outer end 40. The header pipe 34 preferably is rigidLy affixed to the housing, such as by brackets (not shown) attached, such as by welding, to the inside of the outer wall 14. In order to accommodate any differences between the thermal expansion of the header pipe 34 and the partition 24, the header pipe 34 preferably is slidably moun~ed in the parti~ion opening 33. Preferably, the header pipe 34 extends within the housing 12 for a substantial length and has a relatively small cross sectional area in comparison to the ~ 5 Length thereof.
The exhaust gases enter into the header pipe 34 from the outlet chamber 22 and are discharged from the header pipe 34 to the atmosphere through a lurality of axially spaced discharge tubes or tailpipes 42 which are connected in communi-cation with the outlet portion 38 of the header pipe 34 and extend outwardly through the housing outer wall 14. While five tailpipes A2 are shown in the specific construction illustrated, a fewer or greater number can be used if desired. However, as the number of tailpipes are reduced from five, the noise emanat-ing from the mu~fler in~reases even though the back pressure on the engine remains constant. Preerably, at least three tail-pipes 42 are provided, To obtain a more e~ective reduction in the noise emanating from the mu~fler 10, the tailpipes 42 have an internal cross-sectional area smaller than the internal cross-sectional area o~ the outlet portion 38 of the header pipe 34.
In the embodiment illustrated in Fig. ~, the inlet portion 36 o~ the header pipe 34 is located in the outlet chamber 22 and includes a plurality of sm~ll apertures or perforatisns 44 through which the exhaust gases enter the header pipe 34 from the outlet chamber 22. The per~orations 44 are sized to attenuate middle and high requ~ncy noise without creating an excessive resistance to the flow o~ the exhaust gases. As a guide, as many as about 200 perforations having a diameter of 11/16 inch can be provided in the inlet portion 36 of the header pipe 34. In this embodiment, the outer end 46 of the header pipe inlet portion 36 preferably is closed but can include one or more perforations 44. Although in the specific and preferred constructions illustrated in Fig. 1 and 2, the outlet portion 38 ~4C)~
of the header pipe 34 and all of the tailpipes 42 are disposed in the inlet chamber 20, all or part of the header pipe outlet portion 38 and/or all or part of the tailpipes 42 can be dis-posed in the outlet chamber 22.
In the embodiment illustrated in Fig. 2, the outer end 50 of the inlet portion of the header pipe 34 is open. With this arrangement, there may be a slight reduction in the degree of attenuation of middle and high frequency noise. However, this is at least partially offset by a lower restriction to the flow of the exhaust gases and a xesultant lower back pressure on the engine, which may be more desira~le for some applications.
The muffler provided by the invention beneficially reduces the noise level without substantially reducing engine power. As the exhaus~ gases pass through the muffler, there is provided a snubbing action which progressively, but only par-tially, smooths out the pulsating flow of the exhaust gases.
M~re specifically, some attenuation of noise occurs as the exhaust gases expand into the inlet chamber 20 and the sound waves reflect against the inside o the outer wall 14, the end wall 16, and the partition 24. Some urther attenuation of noise is effected in the outlet chamber 22 because of the reflection and cancellation of sound waves occurring therein. As mentioned above, the perforations 44 in the inlet portion 36 of the header pipe 34 (when used) tend to attenuate middle and high frequency noise. A final stage of reflection and cancellation of sound waves occurs in the header pipe 34 as the exhaust gases flow there~hrough and exit through the tailpipes 420 The relatively small, rigidLy mounted header pipe 34 is believed to prevent, or at least minimize, the introduction of shell noise into the exiting exhaust gases, whereas many mufflers of conventional cons~ruction are prone to introduce a drumming or shell noise into the exhaust gases irmnediately upstream of the tailpipe.
Various of the features of the invention are set forth in the following claims.
TITLE
"EXHAUST MUFFLER"
INVENTORS
Donald K. Stephenson and Donald R. Hanson BACKGROUND OF THE INVENTION
The invention relates to exhaust mufflers for internal combustion engines and more particularly to exhaust mufflers particularly adapted for use on snowmobiles.
In order to reduce the noise eminating from vehicles powered by an internal combustion engine, particularly snowmobiles, considerable effort has been directed towards developing exhaust mufflers which are capable of attenua~ing the noise generated by the pulsating exhaust gases without substantially reducing the engine power. Prior muffler constructions are disclosed in the following United States Patents:
Smale 3,853,201 issued December 10, 1974 Betts et al 3,776,366 issued December 4, 1973 Jozepaitis 3,419,107 issued December 31, 1968 Bryant 2,960,179 issued November 15, 1960 Bryant 2,825,421 issued March 4, 1958 Bryant 2,520,756 issued August 29, 1950 Chipley 2,239,549 issued April 22, 1941 Powell 1,998,385 issued April 16, 1935 SUMMARY OF THE INVENTION
. _ ~" The invention provides a muffler comprising an elongated tubular housing having an outer wall and including an internal partition dividing the housing ~ .
,~.'.
$~ )5 into an inlet chamber and an outlet chamber, which partition includes at least one port communicating between the inlet and outlet chambers, an inlet in the housing outer wall for admitting exhaust gases into the inlet chamber, an elongated tubular header pipe disposed inside and extending lengthwise of the housing through the partition, which header pipe has an outlet portion located in the inlet chamber and an inlet portion located in and communicating with the outlet chamber, and a plurality of discharge tubes which are axially spaced on the header pipe, are connected in communication with the header pipe outlet portion,and extend outwardly through the housing outer wall.
In accordance with one embodiment of the invention, the discharge tubes have an internal cross-sectional area smaller than the internal cross-sectional area of the header pipe outlet portion.
In accordance with one embodiment of the invention, at least three discharge tubes are employed.
~; In accordance with one embodiment of the invention, the header pipe inlet portion includes a plurality of small perfora~ions through which the exhaust gases enter :
the header pipe from the outlet cham~er.
In accordance with one embodiment of the invention, the header pipe inlet portion includes an open outer end through which the exhaust gases enter the header pipe from the outlet chamber.
Other features, aspects and advantages of the embodiments of the invention will become apparent upon reviewing the following detailed description, .~ -2-~ .
the drawing, and the appended claims.
Fig. 1 is a side sectional view, partially broken away, of a muffler embodying various of the ~eatures of the invention.
Fig. 2 is a side sectional view, partially broken away, of an alternate construction of a muffler embodying various features of the invention.
Before explaining the invention in detaiL, it is to be understood that the invention is not limited in its applica-tion to the details of construction and the arrangements of the components set forth in the following description or illus-trated in the drawing. The invention is capable of other embodi-ments and of being practiced and carried out in various ways.
Also, it is to be understood that the phraseology and terminology employed herein is for the purposes of description and should not be regarded as limiting.
DESCRIPTIO~ OF THE PREFERRED EMBODIMENTS
Illustrated in the drawing is a muffler 10 which embodies various of the features of the invention and which incl~des an elongated tubular shell or housing 12 having an outer or sidewall 14. The outer wall 14 preferably is cylindrically shaped and is closed at the opposite ends by respective dished ,, end walls 16 and 18. While other arcuate shapes and arrangements can be used, the end walls 16 and 18 preferably are partially spherically shaped and are inwardly concave.
The housing 12 is divided into a first or inlet chamber 20 and a second or outlet chamber 22 by a dished internal partition 24 which preferably is located so that the length of . _ s the inlet chamber 20 is substantially longer than th~ outlet chamber 22. While in ~he specific construction illus~rated the partition is partially spherically shaped and is concave with respect to the inlet chamber 20, it can be convexed with res-pect to the inlet chamber 20 and can have an arcuate shape other than spherical.
Exhaust gases from an internal combustion engine ~not shown) are admitted into ~he inlet chamber 20 through an inlet tube or duct 26 which extends radially outwardly from the inlet chamber 20 through the housing sidewall 14 and in~ludes suitable attachment means ~not shown) for connection to the engine exhaust system. The exhaust gases flow from the inlet chamber 20 into the outlet chamber 22 through one or more ports 28 provided in the partition 24. Each port 28 preferably is integrally formed from the material of the partition 24 and includes a tubular portion 30 extending for a relatively short length from the inlet chamber 20 and into the outlet chamber 22 and has a rounded or curved mouth or inlet 32.
Extending lengthwise inside the housing 12 and through an opening 33 provided in the partition 24 is an elongated tubular member or header pipe 34 including an inlet portion 36 and an outlet portion 38 having a rlosed outer end 40. The header pipe 34 preferably is rigidLy affixed to the housing, such as by brackets (not shown) attached, such as by welding, to the inside of the outer wall 14. In order to accommodate any differences between the thermal expansion of the header pipe 34 and the partition 24, the header pipe 34 preferably is slidably moun~ed in the parti~ion opening 33. Preferably, the header pipe 34 extends within the housing 12 for a substantial length and has a relatively small cross sectional area in comparison to the ~ 5 Length thereof.
The exhaust gases enter into the header pipe 34 from the outlet chamber 22 and are discharged from the header pipe 34 to the atmosphere through a lurality of axially spaced discharge tubes or tailpipes 42 which are connected in communi-cation with the outlet portion 38 of the header pipe 34 and extend outwardly through the housing outer wall 14. While five tailpipes A2 are shown in the specific construction illustrated, a fewer or greater number can be used if desired. However, as the number of tailpipes are reduced from five, the noise emanat-ing from the mu~fler in~reases even though the back pressure on the engine remains constant. Preerably, at least three tail-pipes 42 are provided, To obtain a more e~ective reduction in the noise emanating from the mu~fler 10, the tailpipes 42 have an internal cross-sectional area smaller than the internal cross-sectional area o~ the outlet portion 38 of the header pipe 34.
In the embodiment illustrated in Fig. ~, the inlet portion 36 o~ the header pipe 34 is located in the outlet chamber 22 and includes a plurality of sm~ll apertures or perforatisns 44 through which the exhaust gases enter the header pipe 34 from the outlet chamber 22. The per~orations 44 are sized to attenuate middle and high requ~ncy noise without creating an excessive resistance to the flow o~ the exhaust gases. As a guide, as many as about 200 perforations having a diameter of 11/16 inch can be provided in the inlet portion 36 of the header pipe 34. In this embodiment, the outer end 46 of the header pipe inlet portion 36 preferably is closed but can include one or more perforations 44. Although in the specific and preferred constructions illustrated in Fig. 1 and 2, the outlet portion 38 ~4C)~
of the header pipe 34 and all of the tailpipes 42 are disposed in the inlet chamber 20, all or part of the header pipe outlet portion 38 and/or all or part of the tailpipes 42 can be dis-posed in the outlet chamber 22.
In the embodiment illustrated in Fig. 2, the outer end 50 of the inlet portion of the header pipe 34 is open. With this arrangement, there may be a slight reduction in the degree of attenuation of middle and high frequency noise. However, this is at least partially offset by a lower restriction to the flow of the exhaust gases and a xesultant lower back pressure on the engine, which may be more desira~le for some applications.
The muffler provided by the invention beneficially reduces the noise level without substantially reducing engine power. As the exhaus~ gases pass through the muffler, there is provided a snubbing action which progressively, but only par-tially, smooths out the pulsating flow of the exhaust gases.
M~re specifically, some attenuation of noise occurs as the exhaust gases expand into the inlet chamber 20 and the sound waves reflect against the inside o the outer wall 14, the end wall 16, and the partition 24. Some urther attenuation of noise is effected in the outlet chamber 22 because of the reflection and cancellation of sound waves occurring therein. As mentioned above, the perforations 44 in the inlet portion 36 of the header pipe 34 (when used) tend to attenuate middle and high frequency noise. A final stage of reflection and cancellation of sound waves occurs in the header pipe 34 as the exhaust gases flow there~hrough and exit through the tailpipes 420 The relatively small, rigidLy mounted header pipe 34 is believed to prevent, or at least minimize, the introduction of shell noise into the exiting exhaust gases, whereas many mufflers of conventional cons~ruction are prone to introduce a drumming or shell noise into the exhaust gases irmnediately upstream of the tailpipe.
Various of the features of the invention are set forth in the following claims.
Claims (12)
1. A muffler comprising an elongated tubular housing having an outer wall and including an internal partition dividing said housing into an inlet chamber and an outlet chamber, said partition including at least one port communicating between said inlet and outlet chambers, an inlet in said housing outer wall for admitting exhaust gases into said inlet chamber, an elongated tubular header pipe disposed inside and extending lengthwise of said housing, said header pipe having an outlet portion located in said inlet chamber and having an inlet portion located in and communicating with said outlet chamber, and a plurality of discharge tubes which are axially spaced on said header pipe, are connected in communication with said header pipe outlet portion and extend outwardly through said housing outer wall, said discharge tubes having an internal cross-sectional area smaller than the internal cross-sectional area of said header pipe outlet portion.
2. A muffler according to Claim 1 in-cluding at least three of said discharge tubes.
3. A muffler according to Claim 1 where-in said header pipe inlet portion includes a plurality of small perforations through which the exhaust gases enter said header pipe from said outlet chamber.
4. A muffler according to Claim 1 where-in said header pipe inlet portion includes an open outer end through which the exhaust gases enter said header pipe from said outlet chamber.
5. A muffler according to Claim 1 wherein said inlet chamber is larger than said outlet chamber.
6. A muffler according to Claim 1 where-in said header pipe extends through said partition.
7. A muffler comprising an elongated tubular housing having a generally cylindrical outer wall and including an internal partition dividing said housing into an inlet chamber and an outlet chamber, said partition including at least one port communicating between said inlet and outlet chambers, an inlet in said housing for admitting exhaust gases into said inlet chamber, an elongated tubular header pipe which is rigidly mounted inside said housing and extends lengthwise of said housing and through said partition, said header pipe having an outlet portion which is located in said inlet chamber and has a closed outer end and having an inlet portion which is located in and communicates with said outlet chamber, and at least three discharge tubes which are spaced axially on said header tube, which are connected in communication with said header pipe out-let portion, which extend outwardly through said housing outer wall, and through which the exhaust gases exit to atmosphere from said header pipe, said discharge tubes having an internal cross-sectional area smaller than the internal cross-sectional area of said header pipe outlet section.
8. A muffler according to Claim 7 wherein said header pipe inlet portion includes a plurality of small perforations through which the exhaust gases enter said header pipe from said outlet chamber.
9. A muffler according to Claim 8 including at least five of said discharge tubes.
10. A muffler according to Claim 7 wherein said header pipe inlet portion includes an open outer end through which the exhaust gases enter said header pipe from said outlet chamber.
11. A muffler according to Claim 10 including at least five of said discharge tubes.
12. A muffler comprising an elongated tubular housing having an outer wall and including an internal partition dividing said housing into an inlet chamber and an outlet chamber, said partition including at least one port communicating between said inlet and outlet chambers, an inlet in said housing outer wall for admitting exhaust gases into said inlet chamber, an elongated tubular header pipe disposed inside and extending lengthwise of said housing through said parti-tion, said header pipe having an outlet portion located in said inlet chamber and having an inlet portion lo-cated in and communicating with said outlet chamber, and a plurality of discharge tubes which are axially spaced on said header pipe, are connected in communi-cation with said header pipe outlet portion and extend outwardly through said housing outer wall.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US54965275A | 1975-02-13 | 1975-02-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1040105A true CA1040105A (en) | 1978-10-10 |
Family
ID=24193885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA243,506A Expired CA1040105A (en) | 1975-02-13 | 1976-01-14 | Exhaust muffler |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5813732B2 (en) |
| CA (1) | CA1040105A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6295496B2 (en) * | 2014-03-28 | 2018-03-20 | 本田技研工業株式会社 | Exhaust system |
-
1976
- 1976-01-14 CA CA243,506A patent/CA1040105A/en not_active Expired
- 1976-02-02 JP JP1023776A patent/JPS5813732B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51104146A (en) | 1976-09-14 |
| JPS5813732B2 (en) | 1983-03-15 |
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