JP4239654B2 - Snow vehicle - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a snow vehicle equipped with a four-cycle engine.
[0002]
[Prior art]
Conventionally, engines mounted on snowmobiles such as snowmobiles have a relatively simple structure, are light and compact, and have two power cycles. However, due to recent demands for exhaust gas regulations and fuel efficiency improvements, the 4-cycle engine has been developed. However, since the structure of the 4-cycle engine is more complicated than that of the 2-cycle engine, a large arrangement space is required in the engine room. In addition, when a supercharger (turbocharger) or an intercooler, which is a related auxiliary device, is installed to increase engine output, the layout space in the engine room is more restricted and the overall engine height is also increased. There is a tendency.
[0003]
By the way, generally in a snow vehicle, the engine room is formed below the engine hood in front of the steering wheel, and the engine is accommodated therein. The headlight is disposed in the vicinity of the handle. Therefore, the engine hood is formed, for example, in a shape inclined forward, with the lower part of the headlight as the highest point so as not to block the irradiation light path of the headlight. Therefore, in order to save space, various components must be laid out efficiently in a limited space in the engine room.
[0004]
Therefore, in order to suppress the overall height of the engine, for example, the engine is tilted backward as shown in Patent Document 1 below, or the supercharger is arranged in front of the engine as shown in Patent Document 2 below. May be devised. However, when a supercharger is mounted while suppressing the overall height of the engine, the inside of the engine room becomes overcrowded and the flow of cooling air in the engine room tends to deteriorate.
[0005]
On the other hand, as exemplified in Patent Document 3 below, in a vehicle not equipped with a supercharger, the muffler compartment and the engine compartment are separated and formed by partition walls, so that the muffler section and the engine cooling system are made independent. A technique for improving the cooling performance is also known.
[0006]
By the way, the clutch mechanism portion is normally arranged on one side (for example, the left side) of the engine room in the vehicle body width direction, and the exhaust muffler avoids the clutch mechanism portion, and the front of the engine room or the clutch mechanism portion in the vehicle body width direction. Generally, it is arranged on the opposite side (for example, the right side).
[0007]
[Patent Document 1]
JP 2002-364468 A [Patent Document 2]
JP 2001-214750 A [Patent Document 3]
JP-A-8-91277
[Problems to be solved by the invention]
However, particularly when a supercharger is mounted, the supercharger is a component that generates high heat together with the exhaust muffler, the clutch mechanism, and the like, so that the heat source is dispersed in the engine room. On the other hand, for example, the intercooler is desired to have a high cooling effect for cooling the air supplied to the engine to obtain a high output, and the battery avoids an excessive temperature rise in order to avoid performance degradation. It is hoped that. Therefore, when components such as an intercooler that should suppress temperature rise to maintain engine functions and components that serve as heat sources such as a supercharger are laid out in a limited space. The parts group that dislikes high heat, such as an intercooler, can easily receive high heat from the parts group that is a heat source, which may adversely affect the engine function.
[0009]
The present invention has been made in order to solve the above-described problems of the prior art, and its purpose is to suppress the thermal influence from a group of high heat components such as a supercharger on a group of components such as an intercooler that should suppress a temperature rise. It is to provide a snow vehicle that can do.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a snow vehicle according to claim 1 of the present invention includes an engine hood provided at a front portion of a vehicle body, a four-cycle engine housed in an engine room formed below the engine hood, Air introduction / exhaust means for introducing cooling air into the engine room and exhausting the air in the engine room, a supercharger, and an interface for cooling air sent from the supercharger to the engine A snow vehicle having a cooler, wherein the engine room includes at least the intercooler on one side with respect to the center in the vehicle body width direction, and the temperature rise is suppressed to maintain the function of the engine. A second part that emits high heat and includes at least the supercharger on the other side of the engine room with respect to the center in the vehicle width direction. Arranged group, said air introducing exhaust means includes a one side air inlet a one side with respect to the vehicle width direction center provided at a front portion of the engine room, the rear vicinity of the engine room above a one side At least one one-side exhaust port provided in the vehicle body, at least one other-side intake port provided on the other side of the vehicle body width direction center and in the front portion of the engine room, and the other side in the engine room At least one other side exhaust port provided in the vicinity of the rear part, the one side intake port is composed of two upper and lower stages, the upper one side intake port and the lower one side intake port, The supercharger is disposed in front of the engine and at a height corresponding to the upper one-side intake port, and an exhaust muffler belonging to the second component group is a front part of the engine room and the lower part. Located at the height corresponding to the one side inlet Characterized in that was.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a side view of a snow vehicle according to an embodiment of the present invention. FIG. 2 is a perspective view of the inside of the engine room as seen from the side of the snow vehicle. FIG. 3 is a perspective view of the inside of the engine room in plan view of the snow vehicle. FIG. 4 is a perspective view of the inside of the engine room as viewed from the front of the snow vehicle. FIG. 5 is a front view of the snow vehicle.
[0013]
The snow vehicle 1 includes a three-cylinder four-cycle engine 2 (hereinafter simply referred to as “engine 2”) in an engine room 30 to be described later. Hereinafter, the front-rear direction and the left-right direction of the snow vehicle 1 are referred to based on the driver.
[0014]
First, the overall structure of the snow vehicle 1 will be described.
[0015]
As shown in FIG. 1, the snow vehicle 1 has a pair of left and right steering sleds 13 facing in the left-right direction at the lower part of a front part (engine mount frame) 10 a (front part of the car body) of a body frame 10 extending in the front-rear direction. The crawler 16 for driving which circulates the track belt 15 is arrange | positioned under the rear part 10b of the vehicle body frame 10 so that rotation is possible. The crawler 16 includes a drive wheel 17 disposed at the front end of the frame rear portion 10b, a driven wheel 18 disposed at the rear end, a plurality of intermediate wheels 19, a suspension mechanism 20 that suspends and cushions them, and each wheel The track belt 15 is wound around and circulated.
[0016]
The vehicle body frame 10 has a monocoque frame structure, and a frame front portion 10a on which the engine 2 is mounted has a shape that is gradually narrowed toward the front in a plan view, and an upper portion is open. It has a ship bottom shape and is covered with an engine hood 29 from above.
[0017]
Further, a sled house part 41 protruding upward at the front part is formed in the frame front part 10a, and the suspension and steering mechanism part 42 is accommodated in the sled house part 41. A track housing (not shown) that houses the front part of the crawler 16 (near the upper side of the drive wheel 17) is formed continuously and integrally with the frame rear part 10b.
[0018]
The frame rear portion 10b also serves as a cover that accommodates the entire crawler 16 downward. A saddle-shaped seat 22 is arranged above the frame rear portion 10b, and steps 23 (23L, 23R) that are one step lower than the seat 22 are provided on the left and right sides of the seat 22 in the vehicle width direction. . A steering post 25 is erected substantially at the center in the vehicle body width direction between the seat 22 and the frame front portion 10a, and a steering 26 is extended horizontally at the upper end of the steering post 25. . The steering sled 13 is operated by the steering 26 via the steering post 25.
[0019]
An instrument panel 27 is provided near and in front of the steering 26, and a windshield 28 tilts the upper edge of the instrument from the front to both sides so as to surround the front of the instrument panel 27. Standing in the state. The engine hood 29 is formed in a shape in which the bottom of the ship, which has been gently lowered into a substantially streamline shape, is inverted. Near the step between the engine hood 29 and the instrument panel 27, a headlight 31 that irradiates the front is disposed. The engine room 30 is formed below the instrument panel 27 and the engine hood 29 thus arranged.
[0020]
As shown in FIG. 5, the engine hood 29 has air intake ports HR1 (other side intake ports), HR2, HL1 (upper one side intake ports), HL2 (lower one side) for taking outside air into the engine room 30. Side inlet) is formed. Further, as shown in FIG. 3, left and right exhaust ports EXL (one side exhaust port) and EXR (other side exhaust ports) for exhausting the air taken into the engine room 30 to the outside are provided in the engine room 30. Provided near the rear. For example, the exhaust ports EXL and EXR are formed in the vehicle body frame 10 so as to communicate with the engine room 30.
The air intake ports HR1, HL1, HL2 and the exhaust ports EXL, EXR constitute an “air introduction exhaust means”. Details of these will be described later.
[0021]
Next, the configuration of the engine 2 in the engine room 30 will be described.
[0022]
As shown in FIG. 2, the engine 2 is a three-cylinder four-cycle engine with the cylinder head 4 disposed on the upper side, and is disposed close to the lower portion of the steering post 25. The engine 2 is arranged with the crankshaft 7 oriented substantially parallel to the vehicle body width direction and the cylinder head 4 side tilted rearward. Thus, the overall height of the engine is kept low so that the engine hood 29 does not block the irradiation light path LT of the headlight 31.
[0023]
As shown in FIG. 3, a clutch mechanism 38 is provided on the left side of the engine room 30 on the left side of the crankshaft 7. The clutch mechanism 38 is configured as, for example, a V-belt continuously variable transmission incorporating a centrifugal clutch device, and is configured to transmit driving force to the track belt 15 via a passive gear or the like.
[0024]
An intake manifold 39 is disposed above the engine 2 and slightly behind the head cover 8. A supercharger (turbocharger) 45 is disposed below the exhaust manifold cover 37 provided at the left front portion of the engine 2 and slightly closer to the left side in the engine room 30. By disposing the supercharger 45 at a position in front of the engine 2 and lower than the cylinder head 4, the overall height of the engine is suppressed. An air cleaner box 43 is disposed near the right side of the foremost part in the engine room 30. An intercooler 47 is disposed on the right side of the engine room 30 on the right side of the engine 2. The intercooler 47 is fixed to the engine 2 via the mount bracket 52 so that it is not affected by the deformation of the body frame 10.
[0025]
As shown in FIG. 4, the air cleaner box 43 and the compressor housing 45a of the supercharger 45 are connected via the intake passage 44, and the compressor housing 45a and the intercooler 47 are connected via the intake passage 46, and the intercooler. 47 and the intake manifold 39 are connected via an intake passage 48. The intake air STIN introduced from the air cleaner box 43 is compressed by the compressor housing 45a, and the high temperature air is cooled by the intercooler 47 and sent to each cylinder in the engine 2 via the intake manifold 39.
[0026]
Further, the turbine housing 45 b of the supercharger 45 communicates with the exhaust muffler 50 via the exhaust passage 36. The exhaust muffler 50 is disposed slightly to the left of the front part of the engine room 30. Exhaust gas from the engine 2 is used for supercharging in the turbine housing 45b, and is then discharged downward as the vehicle body through the exhaust pipe 50a of the exhaust muffler 50 as exhaust STEX. Further, as shown in FIG. 3, the battery 51 is disposed behind the intercooler 47 at the same height as the intercooler 47 on the right side in the engine room 30. The battery 51 is fixed to the track housing (not shown), for example.
[0027]
As for the height relationship, the supercharger 45, the intercooler 47, and the battery 51 are disposed at a position slightly above from the middle in the height direction of the engine room 30 at substantially the same height. On the other hand, the clutch mechanism portion 38 and the exhaust muffler 50 are disposed at a position that is substantially the same height, below the middle in the height direction of the engine room 30, and close to the bottom of the frame front portion 10a. The air cleaner box 43 is arranged between these and slightly higher than the exhaust muffler 50.
[0028]
The positional relationship in the vehicle body width direction is as follows. The supercharger 45, the clutch mechanism portion 38, and the exhaust muffler 50, which are main high heat component groups (second component groups) that become heat sources that generate high heat, are in the vehicle body width direction center CL (see FIGS. 3 and 4). The left side (one side), that is, the left half of the engine room 30 is arranged. On the other hand, the air cleaner box 43, the intercooler 47, and the battery 51, which are parts groups that dislike high heat (first parts group), are on the right side (the other side) with respect to the center CL in the vehicle body width direction, that is, the right half of the engine room 30. Placed in the section.
[0029]
Next, the formation of the flow path in the engine room 30 will be described.
[0030]
FIG. 6 is a view schematically showing the air flow in addition to a perspective view of the interior of the engine room in plan view of the snow vehicle.
[0031]
As shown in FIGS. 5 and 6, the air intake ports HR <b> 1 and HR <b> 2 are provided on the right side of the front portion of the engine hood 29. The upper air intake HR1 is provided mainly for cooling the intercooler 47 and the battery 51. The lower air intake port HR <b> 2 is exclusively used to supply intake air to the air cleaner box 43. The outside air (inflowing air 54) is efficiently guided from the air intake port HR2 to the air cleaner box 43 by a guide member (not shown).
[0032]
On the other hand, the air intake ports HL 1 and HL 2 are provided on the left side of the front portion of the engine hood 29. The upper air intake port HL1 is provided at substantially the same height as the supercharger 45, and components such as the supercharger 45 and the vicinity thereof are mainly located in the upper half and the left half in the engine room 30. Provided to cool (except for intercooler 47 and battery 51). The lower air intake HL2 is provided at substantially the same height as the exhaust muffler 50, and the clutch mechanism 38, the exhaust muffler 50, and the like are located mainly in the lower half and the left half of the engine room 30. Provided to cool the part. The air intake ports HL1 and HL2 can be configured as a single air intake port, and the components excluding the intercooler 47 and the battery 51 can be widely cooled. Since the air intake is divided into upper and lower parts, the cooling air is reliably and efficiently guided to the supercharger 45 and the exhaust muffler 50 that generate particularly high heat.
[0033]
As shown in FIGS. 3 and 6, the exhaust ports EXL and EXR are provided in the rear part of the engine room 30 corresponding to the steps 23L and 23R. That is, the exhaust ports EXL and EXR are directed to the steps 23L and 23R, respectively, and are configured to exhaust toward the upper surfaces of the steps 23L and 23R, respectively. Thereby, step 23 is warmed by the air warmed in the engine room 30, and antifreezing is achieved.
[0034]
In this configuration, the following cooling air flow is formed in the engine room 30.
[0035]
First, as shown in FIG. 6, a channel STa is formed along the right side of the upper half of the engine room 30 between the air intake port HR1 and the exhaust port EXR. That is, the traveling wind flows into the engine room 30 as the inflow air 53 from the air intake port HR1, and the inflow air 53 cools the intercooler 47 and further cools the battery 51 and then warms it, and then exhausts from the exhaust port EXR. The air 57 is exhausted toward the step 23R.
[0036]
A flow path STb is formed along the left side of the engine room 30 between the air intake ports HL1 and HL2 and the exhaust port EXL. That is, the traveling wind flows into the engine room 30 from the air intakes HL1 and HL2 as inflow air 55 and 56. The inflow air 55 mainly flows into the supercharger 45, and the inflow air 56 mainly flows into the exhaust muffler 50 and the rear. Each of the clutch mechanism portions 38 is cooled, and most of them are exhausted as exhaust air 58 from the exhaust port EXL toward the step 23L.
[0037]
Here, the intercooler 47 and the battery 51 exist in the middle of the flow path STa. The intercooler 47 should have a high cooling effect in order to obtain a high output of the engine 2, and the battery 51 is desired to avoid an excessive temperature rise in order to avoid a decrease in performance. On the other hand, in the middle of the flow path STb, there is a component group that becomes a heat source that generates high heat, such as the supercharger 45, the exhaust muffler 50, and the clutch mechanism 38. Therefore, in the engine room 30, the flow path STa formed on the right side and the flow path STb formed on the left side are substantially partitioned to prevent thermal interference between the two and the intercooler 47. And the influence of the high heat by the heat source in the flow path STb on the battery 51 is suppressed.
[0038]
Also, the air cleaner box 43 is related to the intake air temperature of the engine 2 and should be avoided from high heat. However, the air cleaner box 43 is disposed at the foremost and right side of the engine room 30 and the Since it is separated from the path STb, the influence of high heat by the heat source in the flow path STb is suppressed.
[0039]
According to the present embodiment, air is introduced and exhausted into the engine room 30 by the air introduction / exhaust means, and further, in the engine room 30, the supercharger 45, which is a group of high heat components, and the clutch mechanism. The part 38 and the exhaust muffler 50 are arranged on the left side with respect to the vehicle body width direction center CL, and an air cleaner box 43, an intercooler 47, and a battery 51, which are parts that should suppress a temperature rise in order to maintain the function of the engine 2, Since it is arranged on the right side with respect to the vehicle body width direction center CL, it is possible to suppress the thermal influence from the high heat component group such as the supercharger 45 on the component group such as the intercooler 47 that should suppress the temperature rise. In addition, in the engine room 30, the right-side channel STa and the left-side channel STb are formed so as to be substantially partitioned, so that a group of components that dislike high heat and a group of high-temperature components are separated by separate channels. It can cool independently and can suppress thermal interference mutually more effectively.
[0040]
The air intakes HL1 and HL2 have a two-stage configuration and are provided at heights corresponding to the supercharger 45 and the exhaust muffler 50, respectively, and the supercharger 45 and the exhaust muffler 50 are arranged at the front of the engine room 30. Therefore, the cooling efficiency can be improved by individually introducing cool air to the supercharger 45 and the exhaust muffler 50.
[0041]
In addition, in order to partition the flow path STa more reliably from the flow path STb, for example, a partition wall may be provided in the vehicle width direction center part in the front part in the engine room 30. In addition, a cylindrical introduction air guide portion provided continuously with the air intake port HR1 is formed integrally with the engine hood 29, and the inflow air 53 from the air intake port HR1 is directly guided to the intercooler 47. Also good.
[0042]
In the present embodiment, exhaust ports EXL and EXR are provided in the rear part of engine room 30 so as to be spaced apart from each other in correspondence with air intake ports HR1 and HL1, so that flow path STa and flow path STb are particularly provided. However, from the viewpoint of partitioning the flow path, if the flow path STa and the flow path STb are clearly separated, the exhaust ports EXL and EXR are installed. The position is not limited to that illustrated.
[0043]
In the present embodiment, exhaust 58 and 57 from exhaust ports EXL and EXR are always applied to steps 23L and 23R. However, since there may be cases where the exhaust is not necessary, exhaust 58 and 57 is applied to steps 23L and 23R. It is desirable that the exhaust direction of the exhaust ports EXL and EXR can be switched so as not to be applied.
[0044]
In the present embodiment, the high heat component group such as the supercharger 45 is arranged on the left side with respect to the vehicle body width direction center CL, and the component group that dislikes high heat such as the intercooler 47 is arranged on the right side. Also good.
[0045]
In addition, although the supercharger 45 etc. were mentioned as a high heat | fever component group, and the intercooler 47 etc. were mentioned as a part group which dislikes high heat | fever, these are illustrations, The layout like this invention is applied also to other similar parts groups Is possible.
[0046]
【The invention's effect】
As described above, according to the present invention, it is possible to suppress the thermal influence from the high heat component group such as the supercharger on the component group such as the intercooler that should suppress the temperature rise.
[Brief description of the drawings]
FIG. 1 is a side view of a snow vehicle according to an embodiment of the present invention.
FIG. 2 is a perspective view of the inside of the engine room as viewed from the side of the snow vehicle.
FIG. 3 is a perspective view of the interior of the engine room in plan view of the snow vehicle.
FIG. 4 is a perspective view of the inside of the engine room as viewed from the front of the snow vehicle.
FIG. 5 is a front view of the snow vehicle.
FIG. 6 is a view schematically showing an air flow in addition to a perspective view of the interior of the engine room in plan view of the snow vehicle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Snow vehicle 2 4-cycle engine 10 Body frame 10a Frame front part (vehicle body front part)
29 Engine hood 30 Engine room 38 Clutch mechanism 43 Air cleaner box 45 Supercharger 47 Intercooler 50 Exhaust muffler 51 Battery HR1 Air intake (a part of air introduction / exhaust means, other side intake)
HR2 Air intake port HL1 Air intake port (a part of air introduction / exhaust means, upper one side intake port)
HL2 Air intake (a part of air introduction / exhaust means, lower side intake)
EXL exhaust port (a part of the air introduction exhaust means, one side exhaust port)
EXR Exhaust port (part of air introduction / exhaust means, other side exhaust port)
STa, STb Channel CL Body width direction center

Claims (3)

An engine hood provided at the front of the vehicle body, a four-cycle engine housed in an engine room formed below the engine hood, and air for cooling is introduced into the engine room and a snowmobile with an air introducing exhaust means to exhaust air, and supercharger, the intercooler for cooling the air delivered to the engine from the supercharger,
In the engine room, on one side of the vehicle width direction center, including at least the intercooler, a first component group that should suppress a temperature rise for maintaining the function of the engine is disposed,
A second part group that generates high heat, including at least the supercharger, is disposed on the other side of the engine room in the vehicle body width direction ,
The air introduction / exhaust means includes at least one air intake port provided at a front side of the engine room on one side with respect to the vehicle body width direction center and at least one provided on the one side and in the vicinity of the rear part of the engine room. One side exhaust port, at least one other side intake port provided on the other side of the vehicle width direction center and in the front part of the engine room, and provided on the other side and in the vicinity of the rear part of the engine room And at least one other side exhaust port,
The one-side intake port has a two-stage configuration with an upper one-side intake port and a lower one-side intake port, and the supercharger corresponds to the upper one-side intake port in front of the engine. A snow vehicle characterized in that an exhaust muffler that is disposed at a height and that belongs to the second part group is disposed at a height corresponding to the lower one-side intake port at a front portion of the engine room .   The snow vehicle according to claim 1, wherein the second component group includes at least one of a clutch mechanism and an exhaust muffler.   The snow vehicle according to claim 1, wherein the first part group includes at least one of a battery and an air cleaner box.

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