JPH07125679A - Snow vehicle - Google Patents

Abstract

PURPOSE:To facilitate the attaching and detaching of a throttle body, an air box, an engine body and a cylinder to the inside of a car body, and to secure an installation space for a large capacity fuel tank and an extended brake. CONSTITUTION:A snow vehicle 1 has a body frame 14, an engine 13, a throttle body 19, an air box 23, a fuel tank 24, an engine power transmitting driving clutch 22 provided on the crankshaft 21 of the engine 13, and an engine power transmitting driven clutch 26 provided on a driven shaft 25. The throttle body 19 is arranged behind the engine 13 in an about erect state, and the air box 23 is arranged above the engine 13 and the throttle body 19, and the driven clutch 26 is arranged at a position separating upward as far as a fixed distance from the upper face of the body frame 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow vehicle, and more particularly,
The present invention relates to a snow vehicle in which the arrangement of a throttle body, an air box, a brake mechanism, etc. attached to an engine is improved.

[0002]

2. Description of the Related Art A conventional snow vehicle includes a two-cylinder two-cycle engine 5 inside a vehicle body 50, as shown in FIG.
1, a throttle body 52 is installed in the rear of the engine 51 in a substantially horizontal state, and an air box 53 accommodating an engine intake air supply mechanism is installed in the rear of the throttle body 52, and further behind the air box 53. A fuel tank 54 is arranged in the. In addition, in the space between the upper part of the body frame 55 and the lower part of the air box 53,
The driven shaft 56 is horizontally arranged in the width direction of the vehicle body, and a driven clutch 57 for gear shifting is provided at one axial end of the driven shaft 56, and a drive drop case 58 is provided at the other axial end. ing.
In this case, one brake including a brake disc and a brake caliper is mounted on the driven shaft 56 between the air box 53 and the drive drop case 58.

The power of the engine 51 is supplied from the drive clutch 60 mounted on the crankshaft 59 to the belt 61.
Drive drop case 5 that is transmitted to the driven clutch 57 via the
It is transmitted to the drive shaft 63 of the drive wheel 62 via a chain mechanism or a gear mechanism in 8. As a result, the drive wheel 62 is rotationally driven, and the truck 65 wound around the drive wheel 62 and the driven wheel 64 is cyclically driven. As a result, the snow-covered vehicle travels. In this case, the engine intake air supply mechanism is housed in the air box to silence the intake noise and prevent cold air, snow, and the like outside the vehicle from entering. In the figure, reference numeral 66 is an operating handle, reference numeral 67 is a driver's seat, reference numeral 68 is a windshield, reference numeral 69 is a ski for skiing on snow, and reference numeral 70 is a chamber.

[0004]

However, in the above-described conventional snow vehicle, the air box 53 needs to be arranged on the inner side of the vehicle body in order to keep it away from the cold air outside the vehicle, for various reasons. Since the throttle body 52 and the air box 53 are arranged in series in the front-rear direction of the vehicle body on the rear side of the engine 51, the throttle body 52 and the air box 53 can be used for maintenance, for example.
When the fuel tank 54 is attached / removed, it is difficult to attach / remove the fuel tank 54 on the rear side of the air box 53, and it is difficult to attach / remove the fuel tank 54 and the like. Therefore, there is a problem that the engine body and the cylinder cannot be easily attached / detached.

Further, as described above, since the throttle body 52 and the air box 53 are arranged in series in the longitudinal direction of the vehicle body behind the engine 51, the fuel tank 54
As a result of the limitation of the installation space for the fuel tank 54, there is a problem that the capacity of the fuel tank 54 cannot be increased beyond a predetermined capacity. Furthermore, in recent years, as the performance of snow-covered vehicles has improved, the output of the engine tends to increase and the vehicle speed tends to increase. Therefore, it is necessary to install additional brakes in order to ensure sufficient braking performance in snow-covered vehicles. , Above Figure 5
The snow vehicle having the structure shown in 1 has a problem that there is no extra space for arranging the additional brake.

[0006]

It is an object of the present invention to improve the disadvantages of the above-mentioned conventional example, and in particular, to improve the arrangement of the throttle body and the air box that are installed in the engine so that the throttle body, the air box and the engine inside the vehicle body can be improved. It is an object of the present invention to provide a snow vehicle that facilitates attachment / detachment of a main body, a cylinder, and the like, and can secure a large-capacity fuel tank and an installation space for an additional brake.

[0007]

The present invention according to claim 1 is a snow vehicle in which an engine, a throttle body, an air box, a fuel tank, and the like are arranged above the vehicle body frame and in the longitudinal direction of the vehicle body. The throttle body is arranged substantially upright on the rear side, and the air box is arranged above the engine and the throttle body. This is intended to achieve the above-mentioned object.

According to a second aspect of the present invention, an engine, a throttle body, an air box, a fuel tank, and the like are arranged above the vehicle body frame and in the longitudinal direction of the vehicle body, and a drive side clutch mounted on a drive shaft of the engine is used. In a snow vehicle in which a driven shaft equipped with a driven clutch for transmitting the transmitted power of the engine to wheels is arranged above a vehicle body frame, the throttle body is substantially erected on the rear side of the engine. And the air box is arranged above the engine and the throttle body, and the driven shaft is arranged at a position spaced apart from the upper surface of the body frame by a predetermined distance.
Is adopted. This is intended to achieve the above-mentioned object.

According to a third aspect of the present invention, the driven shaft is equipped with a plurality of brake mechanisms.
This is intended to achieve the above-mentioned object.

According to a fourth aspect of the present invention, at least one brake mechanism of the plurality of brake mechanisms is provided near the driven clutch on the driven shaft. This is intended to achieve the above-mentioned object.

[0011]

According to the first aspect of the present invention, the throttle body is arranged substantially upright on the rear side of the engine, and
Since the air box is located above the engine and throttle body, the air box can be easily attached and detached for maintenance, etc., and the throttle body can be easily attached and detached by removing the air box. Therefore, the engine can be easily attached and detached. Further, due to the above-mentioned arrangement, the size of the engine, the throttle body, the air box, etc. in the front-rear direction of the vehicle can be reduced, and the space behind the engine can be expanded. Since it can be arranged on the front side, the capacity of the fuel tank can be increased more than before, and the weight distribution of the engine, the throttle body, the air box, the fuel tank, etc. inside the vehicle body can be made appropriate. It becomes possible.

According to the second aspect of the present invention, there is a margin created by disposing the air box at a position spaced apart from the upper surface of the vehicle body frame by a predetermined distance, in other words, above the engine and the throttle body. Since the driven shaft is arranged in a certain space portion, it is possible to secure a space for disposing the driven side clutch, the brake mechanism, and the like mounted on the driven shaft, as described above.

According to the present invention of claim 3, since the driven shaft is equipped with a plurality of brake mechanisms, the braking performance is improved when compared with a snow vehicle equipped with only a single brake mechanism. Therefore, it becomes possible to sufficiently cope with the increase in output and speed of the snow vehicle.

According to the present invention of claim 4, since at least one brake mechanism among a plurality of brake mechanisms is provided in the vicinity of the driven side clutch on the driven shaft, the bending stress on the driven shaft during braking of the snowmobile. Can be reduced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 2 shows the external structure of the snowmobile of this embodiment.
The snowmobile 1 includes a vehicle body 2 that houses a two-cylinder two-cycle engine, a throttle body, an air box, a fuel tank, a brake, etc., which will be described later, an operating handle 3, a driver's seat 4, and a windshield. 5, a plurality of drive wheels 6 fixed to the shaft arranged in the vehicle width direction at predetermined intervals, and driven wheels 7 ...
. And the driven wheels 7 and the like, and a pair of skis 9A, 9B for skiing on the snow, which are provided on both sides of the front portion of the vehicle body 2.

Next, the internal structure of the vehicle body 2 of the snowmobile according to the present embodiment will be described with reference to FIGS. 1, 3 and 4, in which the two cylinders 10, 11 and Two-cylinder two-cycle engine 13 having a crankcase 12 and the like
An engine (hereinafter abbreviated as “engine”) is fixed to the body frame 14. A chamber 16 is connected to an exhaust manifold 15 attached to the cylinders 10 and 11 of the engine 13, and a throttle body 19 is attached to an intake manifold 17 and 18 attached to the crankcase 12.
20 are connected in a substantially upright state. Further, a drive clutch 22 is connected to a crankshaft 21 of the engine 13.

Further, an air box 23 accommodating an engine intake air supply mechanism for supplying clean air to the throttle bodies 19 and 20 is arranged in a space portion from the upper side to the rear side of the engine 13 and the throttle bodies 19 and 20. In addition, in the space on the rear side of the air box 23,
A fuel tank 24 is arranged.

In this case, the throttle bodies 19 and 20 are arranged substantially upright on the rear side of the engine 13, and the air box 23 is arranged in the space from the upper side of the engine 13 and the throttle bodies 19 and 20 to the rear side. Therefore, as a result of the expansion of the space on the rear side of the engine 13, the fuel tank 24 can be arranged on the front side of the vehicle body as compared with the conventional case, whereby the capacity of the fuel tank 24 can be increased as compared with the conventional case. . Further, although the air box 23 is arranged above the inside of the vehicle body as compared with the conventional one, the snow vehicle 1
Has a structure in which cold air, snow, or the like outside the vehicle body does not affect the air box 23.

Further, in the space formed above the vehicle body frame 14 and below the air box 23, the driven shaft 25 is horizontal in the vehicle body width direction, and from the upper surface portion of the vehicle body frame 14 as compared with the conventional case. It is arranged in a separated position. At one axial end of the driven shaft 25,
Driven shaft 26 equipped with driven clutch 26
At the other end of the drive shaft 5 in the axial direction, a drive drop case 2 accommodating a transmission mechanism including a pulley, a chain, and the like described later.
7 is equipped.

A belt 28 is provided between the drive clutch 22 and the driven clutch 26 mounted on the engine 13.
The power of the engine 13 is transmitted from the drive clutch 22 to the driven clutch 26 via the belt 28. A first brake disc 29 is coaxially fixed to the drive shaft 25 side of the driven shaft 25, and an outer peripheral side of the first brake disc 29 sandwiches an outer peripheral edge portion of the first brake disc 29 during braking. The caliper 30 is equipped. The first brake disc 29 and the first brake caliper 30 form a first brake mechanism 31.

On the other hand, a second brake disc 32 is coaxially fixed near the bearing 35 mounted on the driven clutch 26 side of the driven shaft 25, and a second brake disc 32 is provided on the outer peripheral side of the second brake disc 32 during braking. A second brake caliper 33 that sandwiches the outer peripheral edge of the brake disc 32.
Is equipped with. Second brake disc 32 and second
The brake caliper 33 constitutes the second brake mechanism 34. In this case, the second brake mechanism 34 is arranged by utilizing the space formed above the vehicle body frame 14 and below the air box 23. Reference numerals 36 and 37 in FIGS. 3 and 4 denote vehicle body side frames.

A drive shaft 38 is disposed below the driven shaft 25 in parallel with the driven shaft 25 at a predetermined interval. The drive shaft 38 has, for example, five drive wheels 9. It is fixed. Inside the drive drop case 27, a pulley 39 fixed to the axial end of the driven shaft 25,
A pulley 40 fixed to the axial end of the drive shaft 38 and a chain 41 wound between the pulleys 39 and 40 are housed, and the rotational driving force of the driven shaft 25 is driven via the chain 41. Shaft 38
Is being transmitted to. Both pulleys 39, 40 and the chain 41 constitute a transmission mechanism.

That is, the power of the engine 13 is supplied from the drive clutch 22 via the belt 28 to the driven clutch 2
6, the driven shaft 25 is driven to rotate, and the rotational driving force of the driven shaft 25 is transmitted to the drive shaft 38 via the chain 41 inside the drive drop case 27. As a result, the drive wheels 9 ... The truck 8 is rotatably driven and the truck 8 is circulated.
As a result, the snowmobile 1 travels on the truck 8 that is circularly driven. In this case, the rotational driving force of the driven shaft 25 can also be transmitted to the drive shaft 38 via a gear or the like.

In the snowmobile of this embodiment, the engine 1
A state in which the throttle bodies 19 and 20 are arranged substantially upright on the rear side of the engine 3 and the engine 13 and the throttle bodies 19 and 20 are covered in the space from the upper side of the engine 13 and the throttle bodies 19 and 20 to the rear side. Since the air box 23 is arranged, the air box 23 can be easily attached / detached for maintenance or the like, and the throttle bodies 19, 20 can be easily attached / detached if the air box 23 is removed. Becomes possible,
Therefore, the engine 13 and the cylinders 10 and 11 can be easily attached and detached.

Further, in the snow vehicle of this embodiment, since the throttle bodies 19, 20 and the air box 23 have the above-mentioned arrangement structure, the dimensions of the engine 13, the throttle bodies 19, 20, the air box 23, etc. in the vehicle front-rear direction. Can be made smaller, which allows the engine 13
As a result of being able to expand the space on the rear side, the fuel tank 24 can be arranged on the front side of the vehicle body as compared with the conventional case, and as a result,
The capacity of the fuel tank 24 can be increased more than before, and the engine 13, the throttle bodies 19 and 20, the air box 23, and the fuel tank 24 inside the vehicle body can be increased.
It is possible to make the weight distribution such as appropriate.

In the snowmobile of this embodiment, the first
In addition to the brake mechanism 31, the second brake mechanism 34 is arranged utilizing the space formed above the vehicle body frame 14 and below the air box 23. Compared to a snow vehicle equipped only with a mechanism, it becomes possible to improve the braking ability,
As a result, it becomes possible to sufficiently cope with the high output and high speed of the snow vehicle.

Further, in the snow vehicle of this embodiment, the driven shaft 25 is arranged in the space between the vehicle body frame 14 and the air box 23 and at a position separated from the upper surface of the vehicle body frame 14 as compared with the conventional case. Therefore, a space for equipping the driven shaft 25 with the second brake mechanism 34 can be secured.

Further, in the snowmobile of this embodiment, the second
Since the brake mechanism 34 is provided in the driven shaft 25 near the bearing 35 on the side where the driven clutch 26 is disposed, it is possible to reduce bending stress on the driven shaft 25 during braking of the snowmobile.

[0030]

As described above, according to the snow vehicle of the present invention as set forth in claim 1, the throttle body is arranged substantially upright on the rear side of the engine, and is arranged above the engine and the throttle body. Since the air box is installed, the air box can be easily attached and detached for maintenance, etc., and the throttle body can be easily attached and detached by removing the air box, and therefore the engine can be easily attached and detached. It becomes possible to do it. Furthermore,
Due to the above-mentioned arrangement, the dimensions of the engine, throttle body, air box, etc. in the front-rear direction of the vehicle can be reduced, and the space behind the engine can be expanded as a result. Therefore, the capacity of the fuel tank can be increased more than before, and the weight distribution of the engine, throttle body, air box, fuel tank, etc. inside the vehicle body can be made appropriate. Will be possible
Has the effect.

Further, according to the snow vehicle of the present invention as set forth in claim 2, the air box is arranged at a position separated from the upper surface of the body frame by a predetermined distance upward, in other words, the air box is arranged above the engine and the throttle body. Since the driven shaft is arranged in the space with a margin caused by the above, it is possible to secure the installation space for the driven side clutch, the brake mechanism, etc. equipped on the driven shaft in the same manner as above. Play.

According to the snow vehicle of the present invention as defined in claim 3, since the driven shaft is equipped with a plurality of brake mechanisms, when compared with a snow vehicle having only a single brake mechanism, Since it is possible to improve the braking ability,
It is possible to sufficiently cope with the increase in the output and the speed of the snow vehicle.

According to the snow vehicle of the present invention as set forth in claim 4, since at least one brake mechanism among a plurality of brake mechanisms is provided in the vicinity of the driven side clutch on the driven shaft, braking of the snow vehicle is possible. At times, it is possible to reduce the bending stress on the driven shaft.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an arrangement state of an engine / throttle body / air box and the like of a snowmobile in the present embodiment to which the present invention is applied.

FIG. 2 is an external view showing the entire structure of the snowmobile according to the present embodiment.

FIG. 3 is an explanatory diagram showing an arrangement state of an engine / throttle body / air box / clutch etc. of a snow vehicle in the present embodiment.

FIG. 4 is an explanatory view showing an arrangement state of clutches, shafts and the like of the snowmobile according to the present embodiment.

FIG. 5 is an explanatory view showing an arrangement state of a snowmobile engine / throttle body / air box and the like in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Snowmobile 13 Engine 14 Body frame 19,20 Throttle body 21 Crankshaft as a drive shaft 22 Drive clutch as a drive side clutch 23 Air box 24 Fuel tank 26 Driven clutch as a driven side clutch 25 Driven shaft as a driven shaft 31 First brake mechanism 34 Second brake mechanism 38 Drive shaft

Claims (4)

[Claims] 1. A snow vehicle comprising an engine, a throttle body, an air box, a fuel tank, and the like arranged above the vehicle body frame in the longitudinal direction of the vehicle body, wherein the throttle body is substantially erected on the rear side of the engine. In addition, the snow box is characterized in that the air box is arranged above the engine and the throttle body. 2. An engine, a throttle body, an air box, a fuel tank, and the like are arranged above the vehicle body frame in the longitudinal direction of the vehicle body, and the engine is transmitted from a drive side clutch mounted on the drive shaft of the engine. In a snow vehicle in which a driven shaft equipped with a driven clutch for transmitting power to wheels is arranged above a vehicle body frame, the throttle body is arranged substantially upright on the rear side of the engine, and The air box is arranged above the engine and the throttle body,
A snowmobile, wherein the driven shaft is arranged at a position spaced apart from the upper surface of the body frame by a predetermined distance upward. 3. The snowmobile according to claim 2, wherein the driven shaft is equipped with a plurality of brake mechanisms. 4. At least one of the plurality of brake mechanisms is provided in the vicinity of the driven side clutch on the driven shaft.
The snow vehicle according to claim 3, wherein the snow vehicle is equipped with two brake mechanisms.