CA2059415C - Wind leading system for snowmobile - Google Patents
Wind leading system for snowmobile Download PDFInfo
- Publication number
- CA2059415C CA2059415C CA002059415A CA2059415A CA2059415C CA 2059415 C CA2059415 C CA 2059415C CA 002059415 A CA002059415 A CA 002059415A CA 2059415 A CA2059415 A CA 2059415A CA 2059415 C CA2059415 C CA 2059415C
- Authority
- CA
- Canada
- Prior art keywords
- radiator
- snowmobile
- windshield
- engine
- seat
- 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 - Fee Related
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/08—Air inlets for cooling; Shutters or blinds therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
- B60K11/04—Arrangement or mounting of radiators, radiator shutters, or radiator blinds
Abstract
A snowmobile having an improved cooling arrangement including a front mounted radiator and a ducting system for ducting cooling air through the radiator and away from the windshield and rider's hands on the handlebars of the snowmobile.
Description
WrND LEADING sYSTEM FOR SNOWMOBILE
BACRt~ROUND OF THE INVENTION
This invention relates to a wind leading system for a snowmobile and more particularly to an arrangement for guiding the flow of cooling air across the radiator of a snowmobile and away from the rider and windshield.
Many forms of snowmobiles are powered by water cooled internal combustion engines. Because of the configuration of the snowmobile, the engine compartment is positioned ahead of the rider and windshield and the radiator for exchanging heat from the engine coolant is normally positioned either to the front of or above the powering engine. Of course, it is necessary to provide an arrangement for drawing atmospheric air and passing it across the radiator to cool the coolant before it is returned to the engine. The air that has passed across the radiator must then be discharged back to the atmosphere. It is not desirable to discharge this air into the engine compartment because it is very heavily laden with moisture and the moisture can cause corrosion and other problems to the engine if the water is accumulated in the engine compartment, Therefore, it has been the practice to duct the air that flows through the radiator externally and in a position forward of the rider and the windshield.
This type of flow arrangement, however, has numerous disadvantages. In the first instance, because of the fact that the air that has passed through the radiator contains a large amount of water vapor and is at a somewhat elevated temperature, if this water laden air impacts the windshield, which will be at a much lower temperature, condensation or freezing may occur.
Obviously, this will obstruct the vision of the rider.
In addition, the water laden air will be. directed around the windshield and on the hands of the rider since the handlebars for steering the snowmobile are normally- positioned at an elevated position to the rear of the windshield and frequently extend transversely outwardly beyond the peripheral edges of the windshield. The rider's hands, although gloved, will be impacted by this moisture laden air and this will also cause a substantial chill to the rider's hands.
SUMMARY OF THE INVENTION
This invention provides an improved arrangement for ducting the air through t:he radiator of a small snowmobile and away from the windshield and rider. Further this invention provides improved wind directing system for a snowmobile wherein the air flow will be directed away from the rider and windshield.
This invention is adapted to be embadied in a snowmobile having a body containing a driving track and a rider's seat positioned over the driving track and to the rear of the body of the snowmobile. A steering handlebar assembly is disposed ~~5~4~.
forwardly of the seat for steering at least one dirigible front ski carried by the body. A water cooled internal combustion engine is positioned within the body forwardly of the seat and the handlebars for driving the drive track. A radiator for exchanging heat from the coolant of the engine is disposed in the forward portion of the body and within the body. Air inlet ducts are positioned in the body forwardly of the radiator for permitting the flow of atmospheric air into the body and across the radiator. A windshield is positioned forwardly of the handlebar assembly and rearwardly of the radiator. Ducting means are formed in the body for directing the air flowing through the radiator away from the handlebar and the windshield so that water laden air passing through the radiator will not impact upon the rider's hands or an the windshield.
HRIEF DESCRIPTION OF TIE DRAWINGS
Figure 1 is a side elevational view of a snowmobile constructed in accordance with an embodiment of the invention.
Figure 2 is a top plan view of the snowmobile.
Figure 3 is an enlarged front elevational view of the snowmobile.
Figure 4 is an enlarged side elevational view of the engine compartment portion of the snowmobile with a portion broken away to show the inlet air system and its relationship to the radiator.
Figure 5 is a top plan view of the portion of the snowmobile shown in Figure 4 with the body shown in phantom.
BACRt~ROUND OF THE INVENTION
This invention relates to a wind leading system for a snowmobile and more particularly to an arrangement for guiding the flow of cooling air across the radiator of a snowmobile and away from the rider and windshield.
Many forms of snowmobiles are powered by water cooled internal combustion engines. Because of the configuration of the snowmobile, the engine compartment is positioned ahead of the rider and windshield and the radiator for exchanging heat from the engine coolant is normally positioned either to the front of or above the powering engine. Of course, it is necessary to provide an arrangement for drawing atmospheric air and passing it across the radiator to cool the coolant before it is returned to the engine. The air that has passed across the radiator must then be discharged back to the atmosphere. It is not desirable to discharge this air into the engine compartment because it is very heavily laden with moisture and the moisture can cause corrosion and other problems to the engine if the water is accumulated in the engine compartment, Therefore, it has been the practice to duct the air that flows through the radiator externally and in a position forward of the rider and the windshield.
This type of flow arrangement, however, has numerous disadvantages. In the first instance, because of the fact that the air that has passed through the radiator contains a large amount of water vapor and is at a somewhat elevated temperature, if this water laden air impacts the windshield, which will be at a much lower temperature, condensation or freezing may occur.
Obviously, this will obstruct the vision of the rider.
In addition, the water laden air will be. directed around the windshield and on the hands of the rider since the handlebars for steering the snowmobile are normally- positioned at an elevated position to the rear of the windshield and frequently extend transversely outwardly beyond the peripheral edges of the windshield. The rider's hands, although gloved, will be impacted by this moisture laden air and this will also cause a substantial chill to the rider's hands.
SUMMARY OF THE INVENTION
This invention provides an improved arrangement for ducting the air through t:he radiator of a small snowmobile and away from the windshield and rider. Further this invention provides improved wind directing system for a snowmobile wherein the air flow will be directed away from the rider and windshield.
This invention is adapted to be embadied in a snowmobile having a body containing a driving track and a rider's seat positioned over the driving track and to the rear of the body of the snowmobile. A steering handlebar assembly is disposed ~~5~4~.
forwardly of the seat for steering at least one dirigible front ski carried by the body. A water cooled internal combustion engine is positioned within the body forwardly of the seat and the handlebars for driving the drive track. A radiator for exchanging heat from the coolant of the engine is disposed in the forward portion of the body and within the body. Air inlet ducts are positioned in the body forwardly of the radiator for permitting the flow of atmospheric air into the body and across the radiator. A windshield is positioned forwardly of the handlebar assembly and rearwardly of the radiator. Ducting means are formed in the body for directing the air flowing through the radiator away from the handlebar and the windshield so that water laden air passing through the radiator will not impact upon the rider's hands or an the windshield.
HRIEF DESCRIPTION OF TIE DRAWINGS
Figure 1 is a side elevational view of a snowmobile constructed in accordance with an embodiment of the invention.
Figure 2 is a top plan view of the snowmobile.
Figure 3 is an enlarged front elevational view of the snowmobile.
Figure 4 is an enlarged side elevational view of the engine compartment portion of the snowmobile with a portion broken away to show the inlet air system and its relationship to the radiator.
Figure 5 is a top plan view of the portion of the snowmobile shown in Figure 4 with the body shown in phantom.
2~~~~~~
Figure 6 is a cross sectional view taken along the line 6-6 of Figure 1 with the body shown in phantom so as to more clearly illustrate the relationship of the radiator to the body.
Figure 7 is a top plan view showing the cooling system for the engine with the associated heat exchangers and radiator.
Figure 8 is a side elevational view of the cooling system components shown in Figure 8.
Figure 9 is a cross sectional view taken along the line 9-9 of Figure 1.
Figure 10 is an enlarged side elevational view of one of the front skis, with a portion broken away so as to more clearly show the construction.
Figure 11 is a cross sectional view taken along the line 11-11 of Figure 10.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION
Referring first to Figures 1-3, a snowmobile constructed in accordance with an embodiment of the invention is identified generally by the reference numeral 11. The snowmobile 11 includes a body assembly 12 made up of a number of parts which may be formed from suitable materials and which includes a nose piece 13 an upper engine cowling 14 and a lower tray 15 which together define an engine compartment in which a powering internal combustion engine, indicated generally by the reference numeral 16 is positioned.
In the illustrated embodiment, the engine 16 is of the inline four cylinder type operating on a two cycle crankcase compression principal. Although the engine 16 is described as ~~5~4~
being a four cylinder inline engine, the engine 16 is, in fact, comprised of two, two cylinder inline engines joined end to end.
It is to be understood that the invention may be employed with engines of other types.
The body 12 further. includes a rear body portion 17 that accommodates a seat 18 adapted to seat one or more riders seated in straddle fashion. A handlebar assembly 19 is positioned forwardly of the seat 18 for steering of the snowmobile, in a manner which will be described.
There is provided further an upper cowling portion, indicated generally at 21, which may be removable to access the engine compartment and which carries an upper windshield 22 that is disposed forwardly of the handlebar assembly 19 for affording protection to the riders seated on the seat 18.
A pair of front skis 23 having a construction to be described are supported in a manner also to be described at the forward portion of the body 12 by means of suspension struts 24 which also accommodate steering movement of the skis 23. The struts 24 are interconnected by means of a tie rod 25 so that they may be steered in unison and one of the skis 24 is provided with a steering link 26 which is connected to a steering rod 27 which is, in turn, operated by a steering column 28 that is coupled to the aforementioned handlebar assembly 19.
Rearwardly of the front skis 25, and beneath the seat 18, the body 12 suspends a carriage assembly, indicated generally by the reference numeral 29 by a suitable suspension system and which carriage assembly 29 supports a drive belt, indicated at 31. The drive belt 31 is trained around a driving sprocket 32, which is driven in a manner to be described, and idler sprockets 33 and 34 that are mounted on a pair of rails 35 of the carriage 29. In addition, further idqer rolls 36 and 37 are carried by the carriage 29 and engage the drive belt 31 so as to conf ine and direct its path of movement. The rear idler wheels 37 are carried by frame members 38 of the carriage assembly 29 in a suitable manner.
The engine 16 is disposed transversely in the engine compartment and its output shaft drives a belt driveshaft 39 in a manner which will also be described and which belt driveshaft 39 extends transversely to the longitudinal center line of the snowmobile 12 as does the crankshaft or output shaft of the engine 16. This belt driveshaft 39 drives a variable pulley 41 of a variable speed pulley drive mechanism indicated generally by the reference numeral 42. This drive pulley 41 drives a belt 43 which, in turn, drives a driven variable pulley 44 which is affixed to an intermediate shaft 45. The intermediate shaft 45 has affixed to it a sprocket 46 which drives a drive belt 47 which is, in turn, trained around a sprocket that is affixed to a shaft 48 which is also coupled to the belt drive sprocket 32.
The construction of the engine 16 and the drive for the variable pulley 41 and its construction is of the type described in the co-pending Canadian application Seri=~1 Number 2, 059, 395, filed January 15, 1992, and assigned tc~ the Assignee hereof.
Basically as has been noted, the engine 16 is of the four cylinder inline type but is actually made up of two inline two cylinder engines connected end to end. The engine 16 also operates on a two stroke crankcase compression principal and as is typical of two cycle crankcase compression engines, the crankcase chamber of the engine 16 is divided into individual chambers each of which are sealed from each others and each of which is associated with a respective one of the engine cylinder bores.
An intake charge is delivered to the crankcase chambers from an induction system which is identified generally by the reference numeral 49 (Figures 1 and 4) and which is described in more detail in the co-pending Canadian application Serial Number 2, 059, 435, filed January 15, 1992, and which is assigned to the Assignee of this application.
Briefly, the induction system 49 includes a pair of air boxes 51 to which atmospheric air is admitted and which is filtered in a manner described in co-pending Canadian application Serial No. 2,059,435 and then delivered to a pair of carburetors 52.
The carburetors 52 communicate with a manifo=Ld 53 that then supplies air to a respective inlet port formed in the respective cylinder block and in which a reed type check valve is provided so as to permit flow into the individual crankcase chambers but not in the opposite direction when the charge is compressed by the downward movement of the pistons.
As is noted in the ca-pending Canadian application, Serial Number 2, 059, 435, the charge admitted to the crankcase chambers of the cylinder blocks of the engine as transferred through scavenge ports to the combustion chamber then fired by a.n ignition system of the type described therein and exhausted through exhaust ports also formed in the individual cylinder blocks. As is noted in the co-pending Canadian application Serial Number 2,059,435, the firing order of the engine 16 and firing timing is such that no two cylinders fire at the same time and the cylinders of each cylinder block fire at 180 degrees from each other. The cylinders of one cylinder block also fire at 90 degrees from the corresponding cylinders of the other cylinder block. The reasons for this will become apparent.
The exhaust ports open through the forward side of the cylinder blocks and communicate with an~exhaust system of the type described in. more detail in the co-pending Canadian application entitled Exhaust System For Snowmobile, Serial Number 2,059,434, filed January 15, 1992 and assigned to the Assignee hereof.
Briefly, the exhaust system (Figures 1 and 2) comprises a first paired exhaust manifold 54 having two inlets and a common outlet (Figures 1 and 2). Because the cylinders of this cylinder block fire at 180 degrees from each other, the firing pulses in the paired manifold 54 will not cause any adverse effects since the exhaust pulses from one exhaust port will not reflect back to the other at any time when it is open to any significant amount. In a similar manner, the exhaust ports of the other cylinder block also communicate with a paired manifold 55 and again since these cylinders fire at 180 degrees from each other, the pairing of the exhaust ports will have no _ g _ adverse effects. A pair of exhaust pipes 56'and 57 extend from the manifolds 54 and 55, respectively and terminate at separate inlets to in a common expansion chamber, silencer 58 positioned at one side of the snowmobile 11 and at one end of the engine 16.
Again, because of the fact that the cylinders fire at 90 degrees from each other, their common communication with a single silencing device 58 will not provide any adverse effect of exhaust gas pulses traveling back through the exhaust system to the individual exhaust ports. The exhaust silencer 58 has a common atmospheric exhaust outlet. .
As has been noted, the engine 16 is liquid cooled and to this end its cylinder blocks and cylinder heads are provided with cooling jackets which communicate with each other. The cooling system for the engine 16 and the manner in which water is circulated through it is described in more detail in the co-pending Canadian application Serial Number 2,059,416, filed January 15, 1992 and assigned to the Assignee hereof.
Briefly, however, this cooling system includes passages that extend through the crankcase chambers from the rear side of the engine 16 to the front side of it for delivering coolant to the cylinder block cooling jackets and, at the same time, cooling the crankcase chambers. This coolant is circulated by coolant pump 59 (Figures 2, 5, ?, and 8) that is positioned on the rear side of the engine and which is driven in a manner as described in the aforenoted co-pending Canadian application Serial Number 2,059,416.
g _ A thermostat assembly 61 is positioned on the intake side of the cylinder head cooling jackets and circulates the coolant back to the heat exchanger system which will now be described by particular reference to Figures 1, 2 and 4 - 8. Basically this heat exchanger system includes a cross flow radiator 62 that is disposed generally above the engine and specifically above the exhaust manifolds 54 and 55. A conduit 63 communicates the thermostat 61 with the left hand side of the cross flow radiator 62. Coolant is then delivered from the other side of the cross flow radiator 62 to a conduit 64 that extends along the right side of the snowmobile and which then curves inwardly to communicate with a longitudinally extending heat exchanger 65 that extends along one side of the underside of the seat 18. The seat 18 is constructed and configured so that air can flow across the heat exchanger 65 for its cooling but some heat will also be transferred to the seat 18 so as to warm the riders.
At the rear end of the seat 18, the heat exchanger 65 communicates with a conduit 66 that supplies coolant to a further transversely extending heat exchanger 67. The heat exchanger 67 then communicates with a conduit 68 which delivers the coolant to a further longitudinally extending heat exchanger 69 which extends parallel to the heat exchanger 65 on the other side of the seat 18. The heat exchanger 69 communicates at its forward end with a conduit 71 that delivers the coolant to the coolant pump 59. The cooling system is also provided with an expansion tank 72 that accommodates for changes in volume of the coolant due to changes in its temperature. A conduit 73 connects the radiator 62 with this expansion tank 72.
~~~;~~~.~
The heat exchangers 65, 67 and 69 may be formed as aluminum extrusions and are suitably finned, the finning for the heat exchanger 67 being shown partially at 74 in Figure 8. These heat exchangers 65, 67 and 69 receive cooling air that is actually circulated by the motion of.the drive belt 31.
The mounting arrangement for the radiator 62 and the way in which the air is ducted across it for cooling purposes will now be described by particular reference to Figures 4 through 9. It should be noted that the snowmobile body 12 is provided with a reinforcing cross member 75 that extends between its opposite sides. This cross member has a pair of upstanding side stays 76 affixed to it which span the opposite sides of the radiator 62 and to which the radiator 62 is affixed by means of respective mounting brackets 77, elastic isolators 78 and a bolt and nut assembly 79.
The cross member 75 further has a pair of mounting brackets 81 affixed to it between the upstanding stays 76. The underside of the radiator 62 has corresponding mounting brackets 82 which are affixed to the brackets 81 by means of bolt and nut assemblies 83 and elastic isolators 84.
Cooling atmospheric air for the radiator 62 is drawn from a pair of nostril like air inlet openings 85 formed in the front of the body 12 and specifically the upper cowl portion 14 thereof (Figures 1 through 6). These inlet openings are defined by downwardly turned portions 86 of the body which direct the air flow rearwardly across the radiator 62 as shown by the arrows in the various figures. These portions 86 terminate forwardly of the radiator 62 and a drain plate 87, which is fixed to the ~~~~~ 5 radiator 62 in a manner to be described, extends under the trailing edge of these body portions 86 and carries an elastic seal 88 which provides sealing engagement so as to form a continuous air. flow path back through the radiator 62.
Beneath the radiator 62, the drain plate 87 is formed with a depressed well section 89 that will accumulate any water which may condense in the air inlet system as thus far described. A
drain tube 91 extends from the well 89 and has a lower end 92 that terminates beneath the engine compartment so that any condensed water will be discharged away from the engine 16 and not cause corrosion problems.
The drain plate 87 is affixed to the radiator 62 by means of mounting flanges 93 that are held by the fasteners 96 which support the radiator 62 on the frame stays 76.
The rear end of the drain plate 87, indicated generally by the reference numeral 94 carries a further seal 95 that engages downwardly extending portions 96 of the body member 14 which, in turn, define a pair of side air exist ducts 97. These ducts 97 are further defined by downwardly turned flanges 98 of the body portion 14.
It should be noted that the outlet ducts 97 are positioned on opposite sides of the upper cowl.. portion 21. As has been previously noted, there is a problem in letting' the air that passes through the radiator 62 impinge upon the windshield 22 where it might condense or even freeze or on the handlebar assemblies 19 where the rider's hands might be chilled.
2~~~~~~
In accordance with the invention, the outlet ducts 97 are disposed rearwardly of the leading edge of the windshield 22 and on opposite sides 'thereof. Furthermore, these ducts 97 pass beneath recesses 99 formed in the upper cowl member 22 which define a pair of generally curved air flow duct which extends rearwardly from the outlet ducts 97 and which diverge so that the air flow will be turned away from not only the windshield 22 but also the handlebar assembly 19. In this way, the ducting of the air through the radiator 62 and its discharge is such that adequate cooling air flow will be possible for the radiator 62 without causing fogging or condensation on the windshield 22 or cooling of the rider's hands on the handlebar 19.
The construction of the steering skis 23 will now be described by particular reference to Figures 10 and 11. Each ski 23 is comprised of a generally channel shape upper member 101 having a pair of spaced apart legs that are connected to the lower end of the strut 24 by means of pivot pins 102. An elastic block 103 is fixed between these upstanding legs and limits the relative pivotal movement of the ski 23 relative to the strut 24.
A generally V shaped lower member 104, which may be formed from a relatively robust material such as aluminum or iron is affixed in a suitable manner to the upper member 101 and has a pair of peripheral flanges 105 on its lower surface. A
replaceable lower ski strip 106 formed from a low friction high strength material such as a very high molecular weight polyethylene is received within the channels 105 and is held to the upper ski assembly by means of studs 107 and nuts 108 so as to be readily replaceable is worn.
2~~~~:~
Affixed in a suitable manner to the underside of the ski insert 106 is a rod like runner 108 having a sharpened lower edge 109 that is designed to contact the body of snow or ice on which the snowmobile 11 is operating. The runner 108 has affixed to it a pair of studs 111 that extend through suitable openings in the replaceable ski strip 106 and also the lower member 104.
Nuts 112 hold the strip 108 and the wear strip 106 to this lower member 104. Because of the foregoing construction with respect to the constnaction of the skis 23, if the ski insert 106 or runner 108 become damaged, they can be easily replaced by removing the nuts 112 and rivets 107. This permits a lower cost replacement and less costly servicing.
A fuel tank 113 is positioned in part beneath the seat 18 and has a fill neck 114 which extends forwardly of it for supplying fuel to the carburetors 52 (Figures 1 and 4). An access panel 115 is provided in the body portion 17 for permitting filling of this fuel tank.
It should be readily apparent from the foregoing description that the described snowmobile construction permits very good cooling of the engine by permitting copious air flow across its radiator while at the same time avoiding fogging or frosting of the windshield or chilling of the rider's hands. Of course, the foregoing description is that of a preferred embodiment of the invention and various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
Figure 6 is a cross sectional view taken along the line 6-6 of Figure 1 with the body shown in phantom so as to more clearly illustrate the relationship of the radiator to the body.
Figure 7 is a top plan view showing the cooling system for the engine with the associated heat exchangers and radiator.
Figure 8 is a side elevational view of the cooling system components shown in Figure 8.
Figure 9 is a cross sectional view taken along the line 9-9 of Figure 1.
Figure 10 is an enlarged side elevational view of one of the front skis, with a portion broken away so as to more clearly show the construction.
Figure 11 is a cross sectional view taken along the line 11-11 of Figure 10.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION
Referring first to Figures 1-3, a snowmobile constructed in accordance with an embodiment of the invention is identified generally by the reference numeral 11. The snowmobile 11 includes a body assembly 12 made up of a number of parts which may be formed from suitable materials and which includes a nose piece 13 an upper engine cowling 14 and a lower tray 15 which together define an engine compartment in which a powering internal combustion engine, indicated generally by the reference numeral 16 is positioned.
In the illustrated embodiment, the engine 16 is of the inline four cylinder type operating on a two cycle crankcase compression principal. Although the engine 16 is described as ~~5~4~
being a four cylinder inline engine, the engine 16 is, in fact, comprised of two, two cylinder inline engines joined end to end.
It is to be understood that the invention may be employed with engines of other types.
The body 12 further. includes a rear body portion 17 that accommodates a seat 18 adapted to seat one or more riders seated in straddle fashion. A handlebar assembly 19 is positioned forwardly of the seat 18 for steering of the snowmobile, in a manner which will be described.
There is provided further an upper cowling portion, indicated generally at 21, which may be removable to access the engine compartment and which carries an upper windshield 22 that is disposed forwardly of the handlebar assembly 19 for affording protection to the riders seated on the seat 18.
A pair of front skis 23 having a construction to be described are supported in a manner also to be described at the forward portion of the body 12 by means of suspension struts 24 which also accommodate steering movement of the skis 23. The struts 24 are interconnected by means of a tie rod 25 so that they may be steered in unison and one of the skis 24 is provided with a steering link 26 which is connected to a steering rod 27 which is, in turn, operated by a steering column 28 that is coupled to the aforementioned handlebar assembly 19.
Rearwardly of the front skis 25, and beneath the seat 18, the body 12 suspends a carriage assembly, indicated generally by the reference numeral 29 by a suitable suspension system and which carriage assembly 29 supports a drive belt, indicated at 31. The drive belt 31 is trained around a driving sprocket 32, which is driven in a manner to be described, and idler sprockets 33 and 34 that are mounted on a pair of rails 35 of the carriage 29. In addition, further idqer rolls 36 and 37 are carried by the carriage 29 and engage the drive belt 31 so as to conf ine and direct its path of movement. The rear idler wheels 37 are carried by frame members 38 of the carriage assembly 29 in a suitable manner.
The engine 16 is disposed transversely in the engine compartment and its output shaft drives a belt driveshaft 39 in a manner which will also be described and which belt driveshaft 39 extends transversely to the longitudinal center line of the snowmobile 12 as does the crankshaft or output shaft of the engine 16. This belt driveshaft 39 drives a variable pulley 41 of a variable speed pulley drive mechanism indicated generally by the reference numeral 42. This drive pulley 41 drives a belt 43 which, in turn, drives a driven variable pulley 44 which is affixed to an intermediate shaft 45. The intermediate shaft 45 has affixed to it a sprocket 46 which drives a drive belt 47 which is, in turn, trained around a sprocket that is affixed to a shaft 48 which is also coupled to the belt drive sprocket 32.
The construction of the engine 16 and the drive for the variable pulley 41 and its construction is of the type described in the co-pending Canadian application Seri=~1 Number 2, 059, 395, filed January 15, 1992, and assigned tc~ the Assignee hereof.
Basically as has been noted, the engine 16 is of the four cylinder inline type but is actually made up of two inline two cylinder engines connected end to end. The engine 16 also operates on a two stroke crankcase compression principal and as is typical of two cycle crankcase compression engines, the crankcase chamber of the engine 16 is divided into individual chambers each of which are sealed from each others and each of which is associated with a respective one of the engine cylinder bores.
An intake charge is delivered to the crankcase chambers from an induction system which is identified generally by the reference numeral 49 (Figures 1 and 4) and which is described in more detail in the co-pending Canadian application Serial Number 2, 059, 435, filed January 15, 1992, and which is assigned to the Assignee of this application.
Briefly, the induction system 49 includes a pair of air boxes 51 to which atmospheric air is admitted and which is filtered in a manner described in co-pending Canadian application Serial No. 2,059,435 and then delivered to a pair of carburetors 52.
The carburetors 52 communicate with a manifo=Ld 53 that then supplies air to a respective inlet port formed in the respective cylinder block and in which a reed type check valve is provided so as to permit flow into the individual crankcase chambers but not in the opposite direction when the charge is compressed by the downward movement of the pistons.
As is noted in the ca-pending Canadian application, Serial Number 2, 059, 435, the charge admitted to the crankcase chambers of the cylinder blocks of the engine as transferred through scavenge ports to the combustion chamber then fired by a.n ignition system of the type described therein and exhausted through exhaust ports also formed in the individual cylinder blocks. As is noted in the co-pending Canadian application Serial Number 2,059,435, the firing order of the engine 16 and firing timing is such that no two cylinders fire at the same time and the cylinders of each cylinder block fire at 180 degrees from each other. The cylinders of one cylinder block also fire at 90 degrees from the corresponding cylinders of the other cylinder block. The reasons for this will become apparent.
The exhaust ports open through the forward side of the cylinder blocks and communicate with an~exhaust system of the type described in. more detail in the co-pending Canadian application entitled Exhaust System For Snowmobile, Serial Number 2,059,434, filed January 15, 1992 and assigned to the Assignee hereof.
Briefly, the exhaust system (Figures 1 and 2) comprises a first paired exhaust manifold 54 having two inlets and a common outlet (Figures 1 and 2). Because the cylinders of this cylinder block fire at 180 degrees from each other, the firing pulses in the paired manifold 54 will not cause any adverse effects since the exhaust pulses from one exhaust port will not reflect back to the other at any time when it is open to any significant amount. In a similar manner, the exhaust ports of the other cylinder block also communicate with a paired manifold 55 and again since these cylinders fire at 180 degrees from each other, the pairing of the exhaust ports will have no _ g _ adverse effects. A pair of exhaust pipes 56'and 57 extend from the manifolds 54 and 55, respectively and terminate at separate inlets to in a common expansion chamber, silencer 58 positioned at one side of the snowmobile 11 and at one end of the engine 16.
Again, because of the fact that the cylinders fire at 90 degrees from each other, their common communication with a single silencing device 58 will not provide any adverse effect of exhaust gas pulses traveling back through the exhaust system to the individual exhaust ports. The exhaust silencer 58 has a common atmospheric exhaust outlet. .
As has been noted, the engine 16 is liquid cooled and to this end its cylinder blocks and cylinder heads are provided with cooling jackets which communicate with each other. The cooling system for the engine 16 and the manner in which water is circulated through it is described in more detail in the co-pending Canadian application Serial Number 2,059,416, filed January 15, 1992 and assigned to the Assignee hereof.
Briefly, however, this cooling system includes passages that extend through the crankcase chambers from the rear side of the engine 16 to the front side of it for delivering coolant to the cylinder block cooling jackets and, at the same time, cooling the crankcase chambers. This coolant is circulated by coolant pump 59 (Figures 2, 5, ?, and 8) that is positioned on the rear side of the engine and which is driven in a manner as described in the aforenoted co-pending Canadian application Serial Number 2,059,416.
g _ A thermostat assembly 61 is positioned on the intake side of the cylinder head cooling jackets and circulates the coolant back to the heat exchanger system which will now be described by particular reference to Figures 1, 2 and 4 - 8. Basically this heat exchanger system includes a cross flow radiator 62 that is disposed generally above the engine and specifically above the exhaust manifolds 54 and 55. A conduit 63 communicates the thermostat 61 with the left hand side of the cross flow radiator 62. Coolant is then delivered from the other side of the cross flow radiator 62 to a conduit 64 that extends along the right side of the snowmobile and which then curves inwardly to communicate with a longitudinally extending heat exchanger 65 that extends along one side of the underside of the seat 18. The seat 18 is constructed and configured so that air can flow across the heat exchanger 65 for its cooling but some heat will also be transferred to the seat 18 so as to warm the riders.
At the rear end of the seat 18, the heat exchanger 65 communicates with a conduit 66 that supplies coolant to a further transversely extending heat exchanger 67. The heat exchanger 67 then communicates with a conduit 68 which delivers the coolant to a further longitudinally extending heat exchanger 69 which extends parallel to the heat exchanger 65 on the other side of the seat 18. The heat exchanger 69 communicates at its forward end with a conduit 71 that delivers the coolant to the coolant pump 59. The cooling system is also provided with an expansion tank 72 that accommodates for changes in volume of the coolant due to changes in its temperature. A conduit 73 connects the radiator 62 with this expansion tank 72.
~~~;~~~.~
The heat exchangers 65, 67 and 69 may be formed as aluminum extrusions and are suitably finned, the finning for the heat exchanger 67 being shown partially at 74 in Figure 8. These heat exchangers 65, 67 and 69 receive cooling air that is actually circulated by the motion of.the drive belt 31.
The mounting arrangement for the radiator 62 and the way in which the air is ducted across it for cooling purposes will now be described by particular reference to Figures 4 through 9. It should be noted that the snowmobile body 12 is provided with a reinforcing cross member 75 that extends between its opposite sides. This cross member has a pair of upstanding side stays 76 affixed to it which span the opposite sides of the radiator 62 and to which the radiator 62 is affixed by means of respective mounting brackets 77, elastic isolators 78 and a bolt and nut assembly 79.
The cross member 75 further has a pair of mounting brackets 81 affixed to it between the upstanding stays 76. The underside of the radiator 62 has corresponding mounting brackets 82 which are affixed to the brackets 81 by means of bolt and nut assemblies 83 and elastic isolators 84.
Cooling atmospheric air for the radiator 62 is drawn from a pair of nostril like air inlet openings 85 formed in the front of the body 12 and specifically the upper cowl portion 14 thereof (Figures 1 through 6). These inlet openings are defined by downwardly turned portions 86 of the body which direct the air flow rearwardly across the radiator 62 as shown by the arrows in the various figures. These portions 86 terminate forwardly of the radiator 62 and a drain plate 87, which is fixed to the ~~~~~ 5 radiator 62 in a manner to be described, extends under the trailing edge of these body portions 86 and carries an elastic seal 88 which provides sealing engagement so as to form a continuous air. flow path back through the radiator 62.
Beneath the radiator 62, the drain plate 87 is formed with a depressed well section 89 that will accumulate any water which may condense in the air inlet system as thus far described. A
drain tube 91 extends from the well 89 and has a lower end 92 that terminates beneath the engine compartment so that any condensed water will be discharged away from the engine 16 and not cause corrosion problems.
The drain plate 87 is affixed to the radiator 62 by means of mounting flanges 93 that are held by the fasteners 96 which support the radiator 62 on the frame stays 76.
The rear end of the drain plate 87, indicated generally by the reference numeral 94 carries a further seal 95 that engages downwardly extending portions 96 of the body member 14 which, in turn, define a pair of side air exist ducts 97. These ducts 97 are further defined by downwardly turned flanges 98 of the body portion 14.
It should be noted that the outlet ducts 97 are positioned on opposite sides of the upper cowl.. portion 21. As has been previously noted, there is a problem in letting' the air that passes through the radiator 62 impinge upon the windshield 22 where it might condense or even freeze or on the handlebar assemblies 19 where the rider's hands might be chilled.
2~~~~~~
In accordance with the invention, the outlet ducts 97 are disposed rearwardly of the leading edge of the windshield 22 and on opposite sides 'thereof. Furthermore, these ducts 97 pass beneath recesses 99 formed in the upper cowl member 22 which define a pair of generally curved air flow duct which extends rearwardly from the outlet ducts 97 and which diverge so that the air flow will be turned away from not only the windshield 22 but also the handlebar assembly 19. In this way, the ducting of the air through the radiator 62 and its discharge is such that adequate cooling air flow will be possible for the radiator 62 without causing fogging or condensation on the windshield 22 or cooling of the rider's hands on the handlebar 19.
The construction of the steering skis 23 will now be described by particular reference to Figures 10 and 11. Each ski 23 is comprised of a generally channel shape upper member 101 having a pair of spaced apart legs that are connected to the lower end of the strut 24 by means of pivot pins 102. An elastic block 103 is fixed between these upstanding legs and limits the relative pivotal movement of the ski 23 relative to the strut 24.
A generally V shaped lower member 104, which may be formed from a relatively robust material such as aluminum or iron is affixed in a suitable manner to the upper member 101 and has a pair of peripheral flanges 105 on its lower surface. A
replaceable lower ski strip 106 formed from a low friction high strength material such as a very high molecular weight polyethylene is received within the channels 105 and is held to the upper ski assembly by means of studs 107 and nuts 108 so as to be readily replaceable is worn.
2~~~~:~
Affixed in a suitable manner to the underside of the ski insert 106 is a rod like runner 108 having a sharpened lower edge 109 that is designed to contact the body of snow or ice on which the snowmobile 11 is operating. The runner 108 has affixed to it a pair of studs 111 that extend through suitable openings in the replaceable ski strip 106 and also the lower member 104.
Nuts 112 hold the strip 108 and the wear strip 106 to this lower member 104. Because of the foregoing construction with respect to the constnaction of the skis 23, if the ski insert 106 or runner 108 become damaged, they can be easily replaced by removing the nuts 112 and rivets 107. This permits a lower cost replacement and less costly servicing.
A fuel tank 113 is positioned in part beneath the seat 18 and has a fill neck 114 which extends forwardly of it for supplying fuel to the carburetors 52 (Figures 1 and 4). An access panel 115 is provided in the body portion 17 for permitting filling of this fuel tank.
It should be readily apparent from the foregoing description that the described snowmobile construction permits very good cooling of the engine by permitting copious air flow across its radiator while at the same time avoiding fogging or frosting of the windshield or chilling of the rider's hands. Of course, the foregoing description is that of a preferred embodiment of the invention and various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A snowmobile having a body carrying a seat at a rear end thereof, a drive belt suspended beneath said seat, a handlebar assembly positioned forwardly of said seat for steering of said snowmobile by at least one dirigible ski mounted at a front portion of said body, an engine compartment positioned forwardly of said seat, a windshield having a base carried by said body forwardly of said seat and said handlebar assembly, a water cooled internal combustion engine contained within said engine compartment for driving said drive belt, a radiator for receiving coolant from said engine, said radiator being positioned within said body at a forward portion thereof, an air inlet opening formed in said body forwardly of said radiator for directing air flow through said radiator, and outlet duct means for ducting the air exiting said radiator along the base of said windshield and rearward and outwardly away from said windshield and said handlebar assembly wherein the outlet duct means comprises a pair of outlet ducts formed by recesses in the body on opposite sides of the base of the windshield.
2. A snowmobile as set forth in Claim 1 wherein the radiator is mounted above the engine in the engine compartment.
3. A snowmobile as set forth in Claim 2 wherein the inlet means comprises a pair of inlet ducts formed in the upper portion of the body forwardly of the radiator and wherein the outlet duct means comprise a pair of outlet ducts formed on opposite sides of the windshield.
4. A snowmobile as set forth in Claim 3 wherein the outlet ducts are positioned beneath and on the sides of the windshield.
5. A snowmobile as set forth in Claim 4 wherein the body is formed with a pair of diverging flow channels beneath the windshield and above the outlet ducts for directing the flow from the outlet ducts rearwardly and away from the handlebar.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPHEI3-17073 | 1991-01-16 | ||
JP3017073A JPH04306168A (en) | 1991-01-16 | 1991-01-16 | Air guiding device of snowmobile |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2059415A1 CA2059415A1 (en) | 1992-07-17 |
CA2059415C true CA2059415C (en) | 2003-01-07 |
Family
ID=11933811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002059415A Expired - Fee Related CA2059415C (en) | 1991-01-16 | 1992-01-15 | Wind leading system for snowmobile |
Country Status (3)
Country | Link |
---|---|
US (1) | US5251718A (en) |
JP (1) | JPH04306168A (en) |
CA (1) | CA2059415C (en) |
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US5673772A (en) * | 1995-10-16 | 1997-10-07 | Martin; Robert L. | Snowmobile braking system |
JPH09193880A (en) * | 1996-01-22 | 1997-07-29 | Yamaha Motor Co Ltd | Vehicle body front structure for snow vehicle |
JP3414915B2 (en) * | 1996-01-22 | 2003-06-09 | ヤマハ発動機株式会社 | Front structure of snowmobile |
JPH09193878A (en) * | 1996-01-22 | 1997-07-29 | Yamaha Motor Co Ltd | Cooling device of snow vehicle |
US6343666B1 (en) * | 1997-10-09 | 2002-02-05 | Polaris Industries Inc. | Snowmobile front suspension |
CA2275851A1 (en) | 1998-06-19 | 1999-12-19 | Kiyomori Asano | Two stroke, multiple cylinder engine for small vehicle |
US6651764B2 (en) * | 1998-12-23 | 2003-11-25 | Bombardier Inc. | Fuel tank for a recreational vehicle |
US6234263B1 (en) * | 1999-01-21 | 2001-05-22 | A & D Boivin Design | Recreational vehicle |
JP2000238688A (en) * | 1999-02-19 | 2000-09-05 | Yamaha Motor Co Ltd | Snow vehicle |
JP2000289684A (en) | 1999-04-05 | 2000-10-17 | Yamaha Motor Co Ltd | Ski for steering snowmobile |
US6439328B1 (en) * | 1999-10-21 | 2002-08-27 | Bombardier Inc. | Adjustable air vent for a vehicle |
US6968916B2 (en) * | 2000-11-03 | 2005-11-29 | Arctic Cat Inc. | Air intake system for a vehicle |
JP2002178980A (en) | 2000-12-08 | 2002-06-26 | Yamaha Motor Co Ltd | Frame structure for snow vehicle |
US7032915B2 (en) * | 2000-12-14 | 2006-04-25 | Bombardier Recreational Products Inc. | Detachable windshield for snowmobile |
US7011142B2 (en) * | 2000-12-21 | 2006-03-14 | Dana Canada Corporation | Finned plate heat exchanger |
JP3879421B2 (en) * | 2001-03-22 | 2007-02-14 | スズキ株式会社 | Saddle riding four-wheeled vehicle |
JP2003154988A (en) | 2001-11-20 | 2003-05-27 | Yamaha Motor Co Ltd | Ski part structure of snow mobile |
JP2003191887A (en) * | 2001-12-27 | 2003-07-09 | Yamaha Motor Co Ltd | Cooling structure for snow mobile |
CA2372399C (en) * | 2002-02-19 | 2010-10-26 | Long Manufacturing Ltd. | Low profile finned heat exchanger |
CA2392610C (en) * | 2002-07-05 | 2010-11-02 | Long Manufacturing Ltd. | Baffled surface cooled heat exchanger |
JP4139179B2 (en) * | 2002-09-30 | 2008-08-27 | 本田技研工業株式会社 | Cooling device for internal combustion engine provided on vehicle for traveling on rough terrain |
JP4063122B2 (en) * | 2003-03-28 | 2008-03-19 | スズキ株式会社 | Snow vehicle |
CA2425233C (en) * | 2003-04-11 | 2011-11-15 | Dana Canada Corporation | Surface cooled finned plate heat exchanger |
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CA2451424A1 (en) * | 2003-11-28 | 2005-05-28 | Dana Canada Corporation | Low profile heat exchanger with notched turbulizer |
US6962194B2 (en) * | 2003-11-28 | 2005-11-08 | Dana Canada Corporation | Brazed sheets with aligned openings and heat exchanger formed therefrom |
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US7232134B2 (en) * | 2004-02-05 | 2007-06-19 | Yamaha Motor Corporation, U.S.A. | Steering ski for snow vehicle |
JP2005254968A (en) * | 2004-03-11 | 2005-09-22 | Honda Motor Co Ltd | Snow vehicle |
JP2005264823A (en) * | 2004-03-18 | 2005-09-29 | Suzuki Motor Corp | Snowmobile with intercooler |
US7779944B2 (en) * | 2004-09-29 | 2010-08-24 | Arctic Cat Inc. | Snowmobile tunnel and rear heat exchanger |
JP2006199176A (en) * | 2005-01-21 | 2006-08-03 | Yamaha Motor Co Ltd | Exhaust device for snowmobile |
JP2006199175A (en) * | 2005-01-21 | 2006-08-03 | Yamaha Motor Co Ltd | Snowmobile |
US7357207B2 (en) * | 2005-02-02 | 2008-04-15 | Brp Finland Oy | Nose cone for a snowmobile |
US7819220B2 (en) | 2006-07-28 | 2010-10-26 | Polaris Industries Inc. | Side-by-side ATV |
WO2008082356A1 (en) * | 2007-01-02 | 2008-07-10 | Snowolverine Ab | An apparatus for heating a part of a saddle |
US20080223639A1 (en) * | 2007-03-13 | 2008-09-18 | Roland Barksdale | Snowmobile with externally mounted radiator |
US8596398B2 (en) | 2007-05-16 | 2013-12-03 | Polaris Industries Inc. | All terrain vehicle |
US8029004B2 (en) * | 2008-06-26 | 2011-10-04 | Bombardier Recreational Products Inc. | Snowmobile ski |
US8127877B2 (en) * | 2008-10-10 | 2012-03-06 | Polaris Industries Inc. | Air intake system for controlling sound emission |
US8994494B2 (en) | 2008-10-10 | 2015-03-31 | Polaris Industries Inc. | Vehicle security system |
CA2787335C (en) | 2010-02-01 | 2017-10-31 | Polaris Industries Inc. | Vehicle cooling system |
US10266216B2 (en) | 2010-04-20 | 2019-04-23 | Denis Boivin | Track system having anti-diving flaps |
US8776931B2 (en) | 2010-04-20 | 2014-07-15 | Denis Boivin | Track system for an all-wheel drive vehicle |
US8613335B2 (en) | 2010-08-03 | 2013-12-24 | Polaris Industries Inc. | Side-by-side vehicle |
US8746719B2 (en) | 2010-08-03 | 2014-06-10 | Polaris Industries Inc. | Side-by-side vehicle |
US10358187B2 (en) | 2014-01-10 | 2019-07-23 | Polaris Industries Inc. | Snowmobile |
CA3207355A1 (en) | 2012-02-09 | 2013-08-15 | Polaris Industries Inc. | Snowmobile with cvt clutch arrangement |
JP5837014B2 (en) * | 2013-09-27 | 2015-12-24 | 本田技研工業株式会社 | Rough terrain vehicle |
US9845004B2 (en) | 2014-01-10 | 2017-12-19 | Polaris Industries Inc. | Snowmobile |
CA2959261A1 (en) | 2014-09-09 | 2016-03-17 | Bombardier Recreational Products Inc. | Heat exchanger for a snowmobile engine air intake |
CA2985632A1 (en) | 2015-05-15 | 2016-11-24 | Polaris Industries Inc. | Utility vehicle |
USD787985S1 (en) | 2015-06-24 | 2017-05-30 | Polaris Industries Inc. | All-terrain vehicle |
US9649928B2 (en) | 2015-06-25 | 2017-05-16 | Polaris Industries Inc. | All-terrain vehicle |
US9884647B2 (en) | 2015-12-10 | 2018-02-06 | Polaris Industries Inc. | Utility vehicle |
US10946736B2 (en) | 2018-06-05 | 2021-03-16 | Polaris Industries Inc. | All-terrain vehicle |
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JPS5810257B2 (en) * | 1974-10-23 | 1983-02-24 | ヤマハハツドウキ カブシキガイシヤ | Kogatasetsujiyoushiya |
US4249626A (en) * | 1977-09-14 | 1981-02-10 | Kawasaki Motors Corp. U.S.A. | Liquid cooling system |
DE3831792A1 (en) * | 1988-09-19 | 1990-03-29 | Bayerische Motoren Werke Ag | Arrangement for the cooling of a component, especially a motorcycle radiator |
US5129473A (en) * | 1990-12-18 | 1992-07-14 | Yamaha Hatsudoki Kabushiki Kaisha | Fan/radiator combination for snowmobile with liquid cooled engine |
-
1991
- 1991-01-16 JP JP3017073A patent/JPH04306168A/en active Pending
-
1992
- 1992-01-13 US US07/820,324 patent/US5251718A/en not_active Expired - Lifetime
- 1992-01-15 CA CA002059415A patent/CA2059415C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US5251718A (en) | 1993-10-12 |
CA2059415A1 (en) | 1992-07-17 |
JPH04306168A (en) | 1992-10-28 |
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Legal Events
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EEER | Examination request | ||
MKLA | Lapsed |