CA1100409A - Exhaust cooling systems for recreational vehicles - Google Patents
Exhaust cooling systems for recreational vehiclesInfo
- Publication number
- CA1100409A CA1100409A CA311,291A CA311291A CA1100409A CA 1100409 A CA1100409 A CA 1100409A CA 311291 A CA311291 A CA 311291A CA 1100409 A CA1100409 A CA 1100409A
- Authority
- CA
- Canada
- Prior art keywords
- engine
- muffler
- cooling
- exhaust
- shroud
- 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
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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/05—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
A B S T R A C T
In a recreational vehicle such as a snowmobile where the engine and muffler are positioned within a common housing, the muffler is enclosed within a jacket which defines a cooling chamber there around. Cooling means such as a fan is provided for directing a flow of cooling air through the chamber and for ducting said flow to atmosphere on the exterior of said housing thereby to inhibit transfer of heat from said exhaust system into said housing.
Where the engine is air-cooled having an array of cooling fins disposed on its exterior, an engine-driven fan is arranged to pass cooling air within a shroud and across said cooling fins, and the cooling means includes a duct adjacent the fan and adapted to direct cooling air from within said shroud to the chamber.
In a recreational vehicle such as a snowmobile where the engine and muffler are positioned within a common housing, the muffler is enclosed within a jacket which defines a cooling chamber there around. Cooling means such as a fan is provided for directing a flow of cooling air through the chamber and for ducting said flow to atmosphere on the exterior of said housing thereby to inhibit transfer of heat from said exhaust system into said housing.
Where the engine is air-cooled having an array of cooling fins disposed on its exterior, an engine-driven fan is arranged to pass cooling air within a shroud and across said cooling fins, and the cooling means includes a duct adjacent the fan and adapted to direct cooling air from within said shroud to the chamber.
Description
This invention relates to improvements in exhaust cooling systems for recreational vehicles, and particularly, although not exclusively, to a new or improved exhaust cooling system which is helpful in combating excessive heat build-up within the engine compartment under the cab o-f a snowmobile Although recreational vehicles such as snowmobiles are intended primarily for cold weather operation, problems can be encountered in providing satisfactory dissipation o:f tlle heat generated by operation of the sno~mobile engine. Recreational sno~mobiles are o necessity of fairly compact form, and the design considerations are such that it becomes almost imperitive to posi-tion the exhaust muffler under the cab at the forward end of the machine so that it is, in effect, located in a common housing with the engine. This con figuration can lead to undesirable build-up of heat under the snowmobile cab, and while such heat build-up can be alleviated to a certain extent by the pro-vision o large ventilation apertures in the snowmobile cab, this is not a satisfactory solu~ion since such large apertures often conflict with styling requirements of the vehicle design. Furthermore, in recent years progress ively more stringen~ requirements have been imposed upon snowmobile manufac-turers as regards operating noise levels. Since a major part of the noise produced by a snowmobile in operation emanates from the engine, one means of reducing operating noise levels which has been widely adopted has been to pro-vide a more complete enclosure of the engine within the cab of ~he snowmobile.
However, this tends to aggravate the problems of heat build-up.
A partial solution to the problems discussed above is provided in United States Patent 3,795,287 Rose wherein the muffler is located trans-~ersely at the forward end of the en~ine compartment and is substantially isolated from the engine compartment by two opposed semi-cylindrical members which form a shield spaced around the muffler. The shield reduces heat ; ra~iation from the muffler into the engine compartment, and also guides a flow of cooling air ~produced from the forward motion of the sno~nobile~ over the muf-fler :
According to the present invention there is provided a recreational vehicle powered by an internal combustion engine having an exhaust system comprising a muffler, an exhaust manifold connected to deliver exhaust gases from the engine to the muffler, and an exhaust duct adapted to deliver exhaust gases from the muf:Eler to atmosphere, said engine and said muffler being positioned within a common housi.ng in the vehicle, said muffler being enclosed within a jacket which defines a cooling chamber around the wall of the muffler, and cooling means for directing a flow of cooling air through said chamber and for ducting said flow to atmosphere on the exterior of said housing there- `
10 b.y to inhibit transfer of heat from said exhaust system into said housing, said cooling means comprising an engine-driven fan.
Pre:Eerably, in a recreational vehicle such as a snowmobile having an air-cooled engine, the engine-driven fan is also employed to drive a flow of air within a shroud over the cooling fins of the engine. In this arrangementJ a duct is connected to the shroud close to the fan so that the .:
flow of air directed over the muffler is relatively cool and has not been appreciably heated through contact with the engine cooling fins.
~le invention will further be described, by way of example only, with reference to the accompanying drawings, wherein:
Figure 1 is a schematic diagram of an exhaust muffler cooling system in accordance with the invention;
Figure 2 is a perspective view of an exhaust muffler cooling system as provided in a snowmobile; and Figure 3 is a perspective view of an alternative arrangement of exhaust muffler cooling s~stem for a snowmobile.
In Figure 1 a two-cylinder air-cooled snowmobile engine is illus-trated in broken lines at 10, the engine having an exhaust manifold 11 which : directs exhaust gas from the engine through an exhaust pipe 12 to a muffler 13, and from there to atmosphere through a tail pipe 1~. The muffler 13 is of .~0 cylindrical form and is enclosed within a jacket 15 which defines an annular `. .'A'~I -- 2 .
.
cooling chamber 16 completely surrounding the muffler.
The engine 10 is enclosed within a shroucL 17 which is spaced from the ellgine cooling fins, and which has an inlet opening 1~ in which is located an engine-driven fan ]9. When the engine is operating ~he fan 19 is driven to direct a current of air over the engine cooling fins in the direction of the arrows 20. A duct 21 communicates between the interior of the shroud 17 and the annular cooling chamber 16, and is designed to deliver a flow of air driven by the fan 19 through the chamber 16, extracting heat rom the muffler 13 and delivering to atmosphere through a pipe 22, thus greatly reducing the amount of heat released by the muffler 13 to its surroundings.
The duct 21 opens from the shroud 17 at a location close to the fan 19, so that the flow o air passed through this duct is relatively cool and has not been appreciably heated by contact with the engine 10 or exhaust manifold 11. If desired, a de:~lector (not shown~ may be provided on the shroud 17 adjacent the inlet to the duct 21 to ensure an adequate flow of cooling air.
~igure 2 shows the exhaust cooling system as mounted in a snowmobile, the latter being indicated in broken lines at 23. The snowmobile 23 has a housing 24 which together with the conventional upper housing structure or cab (not shown) defines a substantially closed engine compartment 25 at the for-ward end of the snowmobile. Within this compartment the snowmobile engine is enclosed within a shroud 17a and is coupled through a transmission 26 shown ~ot in broken lines to drive the snowmobile track (~2w shown). At the inlet end , ~
of ~he shroud 17a an engine-driven fan l9a is located which in operation is adapted to deliver a flow of cooling air over the engine. If desired, duct-ing ~not shown~ may be provided to deliver the spent cooling air to the ex--terior of the engine compartment. The muffler (not shown) is positioned with-; in the engine compartment, transversely at the or~ard end thereof and is enc:Losed within a jacket 15a, exhaust gases being delivered rom the engine to the mufler through an e~haust pipe 12a and Erom the muEfler to atmosphere -3~
through a tailpipe l~la which passes to an opening 27 on the underside of the snowmobile housing 2~.
A duct 21a is connected between the shroud 17a and the jacket 15a to deliver a flow of cooling air generated by the fan l9a into the cooling chamber ~not shown) surrounding the muffler within the jacket 15a. The spent flow of cooling air is delivered from the jacket 15a through the pipe 22a; and is passed to atmosphere through the opening 27.
With the above described muffler cooling arrangement, very little heat generated by the muffler is released within the engine compartment, and accordingly problems of heat build-up within the engine compartment are greatly reduced.
Various configurations of the exhaust cooling system are possible within the scope of the invention. For example as shown in ~igure 3 the jacket l5b is not positioned transversely at the front of the engine compartment, but rather is inclined towards the rear end of the machine, the exhaust gases in this case being released at the rear of the engine compartment, in the neighbor-hood o the track tunnel. The shroud 17b, exhaust pipe 12b and duct 21b are modified as required to suit this configuration.
However, this tends to aggravate the problems of heat build-up.
A partial solution to the problems discussed above is provided in United States Patent 3,795,287 Rose wherein the muffler is located trans-~ersely at the forward end of the en~ine compartment and is substantially isolated from the engine compartment by two opposed semi-cylindrical members which form a shield spaced around the muffler. The shield reduces heat ; ra~iation from the muffler into the engine compartment, and also guides a flow of cooling air ~produced from the forward motion of the sno~nobile~ over the muf-fler :
According to the present invention there is provided a recreational vehicle powered by an internal combustion engine having an exhaust system comprising a muffler, an exhaust manifold connected to deliver exhaust gases from the engine to the muffler, and an exhaust duct adapted to deliver exhaust gases from the muf:Eler to atmosphere, said engine and said muffler being positioned within a common housi.ng in the vehicle, said muffler being enclosed within a jacket which defines a cooling chamber around the wall of the muffler, and cooling means for directing a flow of cooling air through said chamber and for ducting said flow to atmosphere on the exterior of said housing there- `
10 b.y to inhibit transfer of heat from said exhaust system into said housing, said cooling means comprising an engine-driven fan.
Pre:Eerably, in a recreational vehicle such as a snowmobile having an air-cooled engine, the engine-driven fan is also employed to drive a flow of air within a shroud over the cooling fins of the engine. In this arrangementJ a duct is connected to the shroud close to the fan so that the .:
flow of air directed over the muffler is relatively cool and has not been appreciably heated through contact with the engine cooling fins.
~le invention will further be described, by way of example only, with reference to the accompanying drawings, wherein:
Figure 1 is a schematic diagram of an exhaust muffler cooling system in accordance with the invention;
Figure 2 is a perspective view of an exhaust muffler cooling system as provided in a snowmobile; and Figure 3 is a perspective view of an alternative arrangement of exhaust muffler cooling s~stem for a snowmobile.
In Figure 1 a two-cylinder air-cooled snowmobile engine is illus-trated in broken lines at 10, the engine having an exhaust manifold 11 which : directs exhaust gas from the engine through an exhaust pipe 12 to a muffler 13, and from there to atmosphere through a tail pipe 1~. The muffler 13 is of .~0 cylindrical form and is enclosed within a jacket 15 which defines an annular `. .'A'~I -- 2 .
.
cooling chamber 16 completely surrounding the muffler.
The engine 10 is enclosed within a shroucL 17 which is spaced from the ellgine cooling fins, and which has an inlet opening 1~ in which is located an engine-driven fan ]9. When the engine is operating ~he fan 19 is driven to direct a current of air over the engine cooling fins in the direction of the arrows 20. A duct 21 communicates between the interior of the shroud 17 and the annular cooling chamber 16, and is designed to deliver a flow of air driven by the fan 19 through the chamber 16, extracting heat rom the muffler 13 and delivering to atmosphere through a pipe 22, thus greatly reducing the amount of heat released by the muffler 13 to its surroundings.
The duct 21 opens from the shroud 17 at a location close to the fan 19, so that the flow o air passed through this duct is relatively cool and has not been appreciably heated by contact with the engine 10 or exhaust manifold 11. If desired, a de:~lector (not shown~ may be provided on the shroud 17 adjacent the inlet to the duct 21 to ensure an adequate flow of cooling air.
~igure 2 shows the exhaust cooling system as mounted in a snowmobile, the latter being indicated in broken lines at 23. The snowmobile 23 has a housing 24 which together with the conventional upper housing structure or cab (not shown) defines a substantially closed engine compartment 25 at the for-ward end of the snowmobile. Within this compartment the snowmobile engine is enclosed within a shroud 17a and is coupled through a transmission 26 shown ~ot in broken lines to drive the snowmobile track (~2w shown). At the inlet end , ~
of ~he shroud 17a an engine-driven fan l9a is located which in operation is adapted to deliver a flow of cooling air over the engine. If desired, duct-ing ~not shown~ may be provided to deliver the spent cooling air to the ex--terior of the engine compartment. The muffler (not shown) is positioned with-; in the engine compartment, transversely at the or~ard end thereof and is enc:Losed within a jacket 15a, exhaust gases being delivered rom the engine to the mufler through an e~haust pipe 12a and Erom the muEfler to atmosphere -3~
through a tailpipe l~la which passes to an opening 27 on the underside of the snowmobile housing 2~.
A duct 21a is connected between the shroud 17a and the jacket 15a to deliver a flow of cooling air generated by the fan l9a into the cooling chamber ~not shown) surrounding the muffler within the jacket 15a. The spent flow of cooling air is delivered from the jacket 15a through the pipe 22a; and is passed to atmosphere through the opening 27.
With the above described muffler cooling arrangement, very little heat generated by the muffler is released within the engine compartment, and accordingly problems of heat build-up within the engine compartment are greatly reduced.
Various configurations of the exhaust cooling system are possible within the scope of the invention. For example as shown in ~igure 3 the jacket l5b is not positioned transversely at the front of the engine compartment, but rather is inclined towards the rear end of the machine, the exhaust gases in this case being released at the rear of the engine compartment, in the neighbor-hood o the track tunnel. The shroud 17b, exhaust pipe 12b and duct 21b are modified as required to suit this configuration.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A recreational vehicle powered by an internal combustion engine having an exhaust system comprising a muffler, an exhaust manifold connected to deliver exhaust gases from the engine to the muffler, and an exhaust duct adapted to deliver exhaust gases from the muffler to atmosphere, said engine and said muffler being positioned within a common housing in the vehicle, said muffler being enclosed within a jacket which defines a cooling chamber around the wall of the muffler, and cooling means for directing a flow of cooling air through said chamber and for ducting said flow to atmosphere on the exterior of said housing thereby to inhibit transfer of heat from said exhaust system into said housing, said cooling means comprising an engine-driven fan.
2. A vehicle according to claim 1 wherein said engine is air-cooled having an array of cooling fins disposed on its exterior, and shroud means surrounding said engine, said engine-driven fan being adapted to pass cooling air within said shroud and across said cooling fins, said cooling means fur-ther comprising a duct adjacent said fan and adapted to direct said flow of cooling air from within said shroud to said chamber.
3. A vehicle according to claim 1, or 2 wherein said muffler is of elongate form having an inlet end to which exhaust gases from the engine are delivered and an opposite end, said fan delivering cooling air to an end of the jacket corresponding to the inlet end of the muffler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA311,291A CA1100409A (en) | 1978-09-14 | 1978-09-14 | Exhaust cooling systems for recreational vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA311,291A CA1100409A (en) | 1978-09-14 | 1978-09-14 | Exhaust cooling systems for recreational vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1100409A true CA1100409A (en) | 1981-05-05 |
Family
ID=4112353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA311,291A Expired CA1100409A (en) | 1978-09-14 | 1978-09-14 | Exhaust cooling systems for recreational vehicles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1100409A (en) |
-
1978
- 1978-09-14 CA CA311,291A patent/CA1100409A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |