CA1094955A - Exhaust device for internal combustion engines - Google Patents
Exhaust device for internal combustion enginesInfo
- Publication number
- CA1094955A CA1094955A CA264,218A CA264218A CA1094955A CA 1094955 A CA1094955 A CA 1094955A CA 264218 A CA264218 A CA 264218A CA 1094955 A CA1094955 A CA 1094955A
- Authority
- CA
- Canada
- Prior art keywords
- exhaust
- envelope
- vertex
- section
- sectional area
- 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
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- Exhaust Silencers (AREA)
Abstract
ABSTRACT OF DISCLOSURE
An exhaust device is provided comprising a first diver-ging portion extending into a cylindrical envelope into which is axially displaceably mounted a stream-lined conical shape member, said member being adapted to be moved in relationship to the engine rating.
An exhaust device is provided comprising a first diver-ging portion extending into a cylindrical envelope into which is axially displaceably mounted a stream-lined conical shape member, said member being adapted to be moved in relationship to the engine rating.
Description
1 0~ ;5 This invention has for its object an exhaust device for internal combustion en~ines.
It has already been suggested to improve the performances of certain internal combustion engines, to shape their exhaust pipe with a diverging section then a converging section as seen in the direction of the gas flow, such a device being sometimes referred to as an "extractor". Besides, the fact that such de-vices are only fully operational in a small operating range of the engine, i.e. in a small range of rotational speeds, they do not moreover enable to satisfy the imposed requirements of noise level limitations for the exhaust of the engine which is equipped with them.
Whereas there exists, in other respects, a large number of silencer devices for internal combustion engines of the type comprising deflectors or absorbing materials, such silencers introduce by their construction perturbations in the flow of exhaust gases, with generally results in a reduction in perfor-mance of the engines with which they are associated.
It is an object of this invention to provide an exhaust device for internal combustion engines which eliminates the di-sadvantages of the above mentioned means and which, in particu-lar, leads to an improvement in the performances of the engine which is equipped with them, at least as significant as that - obtained by means of devices of the "extractor" type, without presenting the disadvantages inherant to these devices.
It is also another object of this invention to provide such a device, which, contrarily to known devices of the "extrac-tor" type, are operational in a very wide operating range of the engine which is equipped with it.
According to this invention, an exhaust device for inter-
It has already been suggested to improve the performances of certain internal combustion engines, to shape their exhaust pipe with a diverging section then a converging section as seen in the direction of the gas flow, such a device being sometimes referred to as an "extractor". Besides, the fact that such de-vices are only fully operational in a small operating range of the engine, i.e. in a small range of rotational speeds, they do not moreover enable to satisfy the imposed requirements of noise level limitations for the exhaust of the engine which is equipped with them.
Whereas there exists, in other respects, a large number of silencer devices for internal combustion engines of the type comprising deflectors or absorbing materials, such silencers introduce by their construction perturbations in the flow of exhaust gases, with generally results in a reduction in perfor-mance of the engines with which they are associated.
It is an object of this invention to provide an exhaust device for internal combustion engines which eliminates the di-sadvantages of the above mentioned means and which, in particu-lar, leads to an improvement in the performances of the engine which is equipped with them, at least as significant as that - obtained by means of devices of the "extractor" type, without presenting the disadvantages inherant to these devices.
It is also another object of this invention to provide such a device, which, contrarily to known devices of the "extrac-tor" type, are operational in a very wide operating range of the engine which is equipped with it.
According to this invention, an exhaust device for inter-
- 2 ~
lo~ s~s nal combu~tion engines comprisinCJ an exhaust device for an in-teInal combustion enginc comprisirlg a pipe which includes a irst section having a progressively increasing cross-sectional area and then a second section with a progressively decreasing cross-.sectional area of exhaust gas flow as seen in the direct-ion of flow of ths exhaust gases, said section with progressive-ly decrea3in~ cross-sectional area of the exhaust gas flow com-prising an external sub3t~ntially cylindrical envelope and a streamlined member with an ogival or conical surface disposed within said envelope substantially coaxially therewith such that the exhaust gases flow without any disturbances of the fluid stream, said cylindrical envelope having first and second ends, said second end being downstream from said first end so that the exhaust ~ases pass out of said device through said second end.
According to another feature of this invention, the stream-lined member i~ movably mounted into the external enve~
lope along the axis thereof and in a preferred embodiment, such movement is controlled relatively to the engine rating.
The invention will be better understood from the fol-lowing description given as an example and with reference tothe accompanying drawing wherein - figure 1 îs a diagrammatical longitudinal sectional view of a device according to this invention, - figure 2 is an end view oE the device as seen in the direction of arrow A of figure 1, - figure 3 is a view similar to that of figure 1, but for an alternative embodiment.
An exhaust device for internal combustion engine ac-cording to this invention, 10, igures 1 and 2, comprises a diverging section 11 connected to an engine M. which extends, in the direction of flow of the exhaust gases shown by an arrow f, into ,, .
ss an external envelope 12. Into the latter, preferably of cylin-drical shape, is mounted by means of supports 13 and 14, a stream-lined member 15 which defines in conjunction with the envelope 12 an interval 16 with progressively decreasing cross-section in the direction of flow of the exhaust gases.
In an embodiment, the stream-lined member 15 is shaped according to an ogival or conical surface with a vertex 19 and its axis 20 is preferably coaxial with the axis 21 of the en-velope 12.
The stream-lined member 15 is preferably movably mounted inside envelope 12 the direction of possible movement being that of arrow f and the direction opposite thereto. This movement is carried out by means, not shown, adapted to be controlled in relationship with the rating of the engine through a connection 17 from a member 18, which can for example, be the throttle lever of a motor-cycle engine or the accelerator pedal of a car engine, when the engine is that of a motor vehicle.
The operation of a device according to this invention is similar to that of a device of the "extractor" type in respect of the flow of the exhaust gases. In the device of the invention, however, /the vertex 19 of the stream-lined member 15 acts upon the sound wave system to cause a vihration node to appear at said vertex with therefore a decrease in noise relatively to that generated by a usual exhaust.
Complementarily, the longitudinally displaceable mounting of the stream-lined member 15 and the control of the movement subject to the rating of the engine, through connection 17 ena-bles an automatical adjustment of the flow characteristics of the exhaust gases in relation to the rotational rate of the engine, the efficiency of which is thus improved continuously.
10~ 5 In an all:errlat.ivc embodi.ment, f:ig~re 3, on the totality or on ~art o~ ~he length o the cnvel.ope L2, thon punched with oponin-J.s, a aloavo meml~er 22 is added in an acoustically i80-lating material ~IICh af; fiberglaf~s~ rock wool or the like en-cloaed in an external tubing 23~
In ~uch a dcvice, the opcrat:ion of which is similar to that of the embodiment described hereabove, the absorption of the hlgh nound frequenc.ic.s by the sleeve 22 contributes to the acl~ievement o a particularly satif;factory sound level.
lo~ s~s nal combu~tion engines comprisinCJ an exhaust device for an in-teInal combustion enginc comprisirlg a pipe which includes a irst section having a progressively increasing cross-sectional area and then a second section with a progressively decreasing cross-.sectional area of exhaust gas flow as seen in the direct-ion of flow of ths exhaust gases, said section with progressive-ly decrea3in~ cross-sectional area of the exhaust gas flow com-prising an external sub3t~ntially cylindrical envelope and a streamlined member with an ogival or conical surface disposed within said envelope substantially coaxially therewith such that the exhaust gases flow without any disturbances of the fluid stream, said cylindrical envelope having first and second ends, said second end being downstream from said first end so that the exhaust ~ases pass out of said device through said second end.
According to another feature of this invention, the stream-lined member i~ movably mounted into the external enve~
lope along the axis thereof and in a preferred embodiment, such movement is controlled relatively to the engine rating.
The invention will be better understood from the fol-lowing description given as an example and with reference tothe accompanying drawing wherein - figure 1 îs a diagrammatical longitudinal sectional view of a device according to this invention, - figure 2 is an end view oE the device as seen in the direction of arrow A of figure 1, - figure 3 is a view similar to that of figure 1, but for an alternative embodiment.
An exhaust device for internal combustion engine ac-cording to this invention, 10, igures 1 and 2, comprises a diverging section 11 connected to an engine M. which extends, in the direction of flow of the exhaust gases shown by an arrow f, into ,, .
ss an external envelope 12. Into the latter, preferably of cylin-drical shape, is mounted by means of supports 13 and 14, a stream-lined member 15 which defines in conjunction with the envelope 12 an interval 16 with progressively decreasing cross-section in the direction of flow of the exhaust gases.
In an embodiment, the stream-lined member 15 is shaped according to an ogival or conical surface with a vertex 19 and its axis 20 is preferably coaxial with the axis 21 of the en-velope 12.
The stream-lined member 15 is preferably movably mounted inside envelope 12 the direction of possible movement being that of arrow f and the direction opposite thereto. This movement is carried out by means, not shown, adapted to be controlled in relationship with the rating of the engine through a connection 17 from a member 18, which can for example, be the throttle lever of a motor-cycle engine or the accelerator pedal of a car engine, when the engine is that of a motor vehicle.
The operation of a device according to this invention is similar to that of a device of the "extractor" type in respect of the flow of the exhaust gases. In the device of the invention, however, /the vertex 19 of the stream-lined member 15 acts upon the sound wave system to cause a vihration node to appear at said vertex with therefore a decrease in noise relatively to that generated by a usual exhaust.
Complementarily, the longitudinally displaceable mounting of the stream-lined member 15 and the control of the movement subject to the rating of the engine, through connection 17 ena-bles an automatical adjustment of the flow characteristics of the exhaust gases in relation to the rotational rate of the engine, the efficiency of which is thus improved continuously.
10~ 5 In an all:errlat.ivc embodi.ment, f:ig~re 3, on the totality or on ~art o~ ~he length o the cnvel.ope L2, thon punched with oponin-J.s, a aloavo meml~er 22 is added in an acoustically i80-lating material ~IICh af; fiberglaf~s~ rock wool or the like en-cloaed in an external tubing 23~
In ~uch a dcvice, the opcrat:ion of which is similar to that of the embodiment described hereabove, the absorption of the hlgh nound frequenc.ic.s by the sleeve 22 contributes to the acl~ievement o a particularly satif;factory sound level.
Claims (5)
1. An exhaust device for an internal combustion engine comprising a pipe which includes a first section having a pro-gressively increasing cross-sectional area and then a second section with a progressively decreasing cross-sectional area of exhaust gas flow as seen in the direction of flow of the ex-haust gases, said section with progressively decreasing cross-sectional area of the exhaust gas flow comprising an external substantially cylindrical envelope and a streamlined member with an ogival or conical surface disposed within said enve-lope substantially coaxially therewith such that the exhaust gases flow without any disturbances of the fluid stream, said cylindrical envelope having first and second ends, said second end being downstream from said first end so that the exhaust gases pass out of said device through said second end.
2. Device according to claim 1, characterized in that the streamlined member is movably mounted inside the external envelope, said movement being controlled in relationship to the rotational rating of the engine.
3. Device according to claims 1 or 2, characterized in that the external envelope is perforated and is covered on the whole or in part of its length with a sleeve of acoustically isolating material.
4. Device according to claim 1 or 2, characterized in that the external envelope is perforated and is covered on the whole or in part of its length with a sleeve of acoustically isolat-ing material selected from the group consisting of rack wool and fiberglass.
5. A device according to claim 1, wherein said streamlined member has a vertex and is so mounted that said vertex acts upon the sound wave of exhaust gases to produce a vibration node at said vertex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA264,218A CA1094955A (en) | 1976-10-26 | 1976-10-26 | Exhaust device for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA264,218A CA1094955A (en) | 1976-10-26 | 1976-10-26 | Exhaust device for internal combustion engines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1094955A true CA1094955A (en) | 1981-02-03 |
Family
ID=4107130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA264,218A Expired CA1094955A (en) | 1976-10-26 | 1976-10-26 | Exhaust device for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1094955A (en) |
-
1976
- 1976-10-26 CA CA264,218A patent/CA1094955A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |