JP3414518B2 - Cooling structure of vehicle engine room - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure in an engine room of a small snow vehicle, for example.

[0002]

2. Description of the Related Art Conventionally, as a structure of an engine room of a vehicle such as a small snow vehicle, there has been known a structure as shown in, for example, JP-A-51-47712 or JP-A-2-274681. These are equipped with an engine room in front of the vehicle body, an exhaust system muffler is installed at the front of the engine room, and an engine is installed behind it, and the muffler is mainly provided by cooling air taken in from the front of the engine room. After cooling the engine, it is discharged from the rear or rear side of the engine rule.

[0003]

By the way, the exhaust system muffler is usually the highest temperature part, and even if the engine is cooled by the cooling air passing through such a high temperature muffler, the cooling effect is not improved. To increase the output of the engine, it is necessary to take measures such as using a water-cooled type, and the water-cooled type requires a large device.

[0004]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention covers a front portion of a vehicle body with a body cover,
An outside air inlet is provided in the cover, and the air inside the body cover is
For vehicles with engine and muffler installed in the engine room
Oite, wherein a muffler portion and an engine which is disposed in the engine room is separated by a partition forming a muffler chamber and the engine chamber in the body cover, which <br/> et muffler chamber which is separated by the partition wall and engine compartment Independently, each has an outside air introduction path and an exhaust path, and the partition wall part that covers the upper part of the muffler part of the partition wall is
It is close to the outside air inlet, and the outside air inlet is
To communicate with the engine room, which is separate from the engine room
Is characterized by. Further, in the case of a small snow vehicle equipped with a head pipe, the muffler portion is arranged on the front side of the head pipe and the engine is arranged on the rear side of the head pipe.

[0005]

The cooling air that has cooled the muffler is discharged to the outside of the vehicle as it is, and the engine is cooled by the cooling air introduced from the separate outside air introduction passage. For this reason, the heat taken from the muffler portion does not affect the engine or the like, and the cooling performance around the engine can be improved without increasing the size of the cooling device or the like.

[0006]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall view of a small snow vehicle that employs the engine room cooling structure of the present invention, FIG. 2 is an internal perspective view of the engine room in a side view, and FIG. 3 is an internal perspective view of the same in plan view. As shown in FIG. 1, the small snow vehicle includes a front ski 2 below a front portion of a vehicle body 1 and an endless track 3 below a rear portion of the vehicle body 1.

The endless track zone 3 is wound around the drive wheel 4 and a plurality of auxiliary wheels 5, 6, 7, 8 of the vehicle body 1, and the lower auxiliary wheels 5, 6, 7 are provided. Shafts are connected by rail members 10, the shafts of auxiliary wheels 6 in the middle are supported by swing arms 11, and an engine 13 (FIGS. 2 and 3) for driving the drive wheels 4 is mounted on the vehicle body 1. It is arranged in the front engine room 12.

Further, a lower end portion of a lower steering shaft 15 rotatably inserted through a head pipe 14 as shown in FIG. 2 is connected to an intermediate portion of the front ski 2, and an upper end portion of the lower steering shaft 15 is connected to the lower steering shaft 15. The upper steering shaft 16 is connected via a universal joint 17 so as to be vertically bendable. A steering handle 18 is attached to the upper portion of the upper steering shaft 16. The lower steering shaft 15 is arranged so as to vertically penetrate the engine room 12, and a link mechanism 20 and a biasing member 21 are provided at a connecting portion between the front ski 2 and the lower steering shaft 15, and the biasing member 21 is provided. Therefore, the straightness of the front ski 2 is maintained.

The construction of the engine room 12 and the arrangement of the internal equipment will be described with reference to FIGS. 2 and 3. As shown in FIGS. 2 and 3, the main frame 22 and the upper frame 23 that form the vehicle body 1 are separated from the head pipe 14 to the left and right and extend toward the rear, and each upper frame 23 is extended in the middle portion of the vehicle body 1. Each mainframe 22
Is joined and joined. Then, a body cover 24 is covered on the periphery thereof, and an area forward of the confluence of each upper frame 23 and each main frame 22 is partitioned and formed as an engine room 12. The main frame 22 is located in the lower part of the engine room 12 in the height direction, the upper frame 23 is located in the middle part of the engine room 12 in the height direction, and An overhanging frame 26 ( see FIGS. 1 and 3 ) that overhangs outward is attached, and this overhanging frame 26 overhangs outside the body cover 24.

On the rear side of the head pipe 14, the cylinder portion 1
The engine 13 having 3a oriented vertically is mounted, and a battery 28 is mounted on the left side of the engine 13. A carburetor 30 is arranged on the upper rear side of the engine 13, and an air cleaner 31 and a fuel tank 32 are further provided on the upper rear side of the carburetor 30.

A drive pulley 33 driven by the engine 13 is provided on the right side of the engine 13, and a driven pulley 35 supported by a gear case 34 is provided at a slightly upper rear portion of the drive pulley 33. ing. A belt is wound between the drive pulley 33 and the driven pulley 35 so that the rotation of the drive pulley 33 can be transmitted to the driven pulley 35. An idle shaft 36 is provided at the downstream end of the gear train of the gear case 34, and a drive sprocket 37 is attached to the idle shaft 36.

A driven sprocket 38 (FIG. 2) is provided below the drive sprocket 37, and a chain 40 is provided between the drive sprocket 37 and the driven sprocket 38.
Is wound. The drive wheel 4 is attached to the shaft to which the driven sprocket 38 is attached. In the figure, reference numeral 41 is a radiator reservoir tank, and 42 is a catch tank.

A muffler portion 44 is provided in front of the head pipe 14. That is, the exhaust pipe 43 extending from the exhaust port of the engine 13 extends forward from the left side of the head pipe 14 and is connected to the muffler portion 44, and the exhaust pipe 45 is connected below the muffler portion 44. Further, on the front surface of the body cover 24, first, second and third openings 46, 47 and 48 capable of introducing outside air into the engine room 12 are provided.

By the way, in the present invention, the head pipe 14 is used.
The partition wall 50 provided around the front of the engine compartment 12 divides the interior of the engine room 12 into two space chambers. That is,
The partition wall 50 integrally includes a front partition wall portion 50a that blocks the muffler portion 44 from the engine 13 in the front-rear direction, and an upper surface partition wall portion 50b that extends forward from the upper end of the front partition wall portion 50a and covers the upper portion of the muffler portion 44. The front partition wall 50a and the upper partition wall 50b divide the engine compartment 12 into a front muffler compartment 51 and a rear engine compartment 52. By the way, this partition wall 50
Is molded with a heat insulating material such as glass wool to enhance the heat blocking effect.

The front partition wall portion 50a is provided with a minimum clearance hole, for example, for penetrating the exhaust pipe 43, and the upper partition wall portion 50b is projected at a first position.
The upper first opening 4 is provided close to the lower edge of the opening 46.
The outside air can be introduced into the engine chamber 52 from 6 and the outside air can be introduced into the muffler chamber 51 from the second and third openings 47 and 48.

A discharge guide member 53 (see FIG. 3) is provided on both sides of the rear portion of the muffler chamber 51, and the air introduced into the muffler chamber 51 by the discharge guide member 53 is discharged to the discharge port 54 of the body cover 24 (see FIG. 3) . 1, see FIG. 3) . Therefore, when the snow vehicle travels, the outside air is introduced into the muffler chamber 51 through the second and third openings 47 and 48 at the front (solid arrow), and the muffler portion 44 is cooled and then discharged from the discharge port 54. .

On the other hand, the body cover 24 on both sides of the rear part of the engine compartment 52 is also provided with an exhaust port 55. Therefore, the outside air (broken line arrow) introduced from the first opening 46 is exhausted after cooling the engine 13. It is discharged from the outlet 55.

In the cooling structure of the engine room configured as above, the muffler portion 44, which has the highest heat during the operation of the engine 13, is cooled by the cooling air introduced from the second and third openings 47 and 48, and the muffler is cooled. The cooling air that has taken the heat of the portion 44 and has become high temperature is discharged from the discharge port 54 as it is. Further, the engine 13 and auxiliary devices around it are cooled by the cooling air introduced from the first opening 46,
It is directly discharged from the discharge port 55. Although the present embodiment has been described with reference to a snow vehicle, the present invention can be applied to other vehicles.

[0019]

As described above, in the engine room cooling structure of the present invention, the cooling air that has cooled the muffler is discharged to the outside of the vehicle as it is, and the engine is cooled by the cooling air that is introduced from the separate outside air introduction passage. The heat taken from the muffler portion does not affect the engine or the like, and the cooling performance around the engine can be improved without increasing the size of the cooling device or the like.

[Brief description of drawings]

FIG. 1 is an overall view of a small snow vehicle adopting an engine room cooling structure of the present invention

FIG. 2 is an internal perspective view of the engine room in a side view.

FIG. 3 is an internal perspective view in the same plan view.

[Explanation of symbols]

1 ... Body, 12 ... Engine room, 13 ... Engine, 1
4 ... Head pipe, 24 ... Body cover, 44 ... Muffler part, 46 ... First opening part, 47 ... Second opening part, 48 ... Third opening part, 50 ... Partition wall, 50b ... Covering muffler part upper part
Partition wall, 51 ... Muffler room, 52 ... Engine room, 54
... discharge port, 55 ... discharge port.

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B62K 27/04 B60K 11/04 B62J 39/00

Claims (2)

(57) [Claims] 1. A front cover of a vehicle body is covered with a body cover,
The outside air inlet is provided in the cover and the inside of the body cover
Vehicle with engine and muffler installed in the engine room
In ambient air the a muffler portion and an engine which is disposed in the engine room is separated by a partition forming a muffler chamber and the engine chamber in the body cover, respectively and independently thereto muffler chamber and an engine compartment separated by a partition wall The partition wall that has an introduction path and an exhaust path and covers the upper part of the muffler section of the partition wall is an outside air introduction port.
And the outside air inlet is separated from the muffler chamber by the partition wall.
A cooling structure for the engine room of a vehicle, characterized in that it communicates with a separated engine room . 2. The cooling structure for an engine room of a vehicle according to claim 1, wherein the vehicle is a small snow vehicle having a head pipe, the muffler portion is on the front side of the head pipe, and the engine is on the rear side of the head pipe. A cooling structure for an engine room of a vehicle, which is characterized in that