JPH1113566A - Intake device for unlevelled ground running vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device of an unlevelled ground running vehicle which can prevent water from entering an air cleaner and secure an intake air amount to an engine. SOLUTION: A fuel tank 5 is arranged between front wheels and rear wheels of a vehicular body frame of an unlevelled ground running vehicle. An engine is mounted on a lower side of the fuel tank 5. In an intake device for such a vehicle, a flat guide plate 80 is arranged below a bottom surface 5d of the fuel tank 5 with a spacing. The space between the flat guide plate 80 and the tank bottom surface 5d serves as an air passage 86. A front end of the air passage 86 is opened to the vehicle front direction. A rear end of the air passage 86 is arranged near an air inlet 66a of an intake duct 66.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air intake system for an off-road vehicle.

[0002]

2. Description of the Related Art In general, a vehicle for running on rough terrain has front and rear wheels provided with wide and low pressure tires (balloon tires) at a front portion and a rear portion of a body frame, respectively, and between the front and rear wheels. A fuel tank is provided, and an engine is mounted below the fuel tank. In this type of vehicle,
For example, since the wheels may be used for traveling underwater such that the wheels are substantially submerged, it is required that water can be prevented from entering the air cleaner.

Conventionally, in order to prevent water from entering the air cleaner, an air inlet of an intake duct for introducing outside air into the air cleaner is located at a high place of the vehicle, for example, when the air inlet is opened near a bottom surface of a fuel tank. There is.

[0004]

However, in the above-described structure in which the air inlet of the conventional air cleaner is opened near the bottom of the fuel tank, the air heated at a high temperature by the engine heat is sucked, and as a result, the charging efficiency is increased. And there is a concern that sufficient engine output cannot be secured.

The present invention has been made in view of the above-mentioned conventional circumstances, and provides an air intake device for an irregular terrain vehicle that can prevent water from entering an air cleaner and can increase the charging efficiency of an engine. It is intended to be.

[0006]

According to a first aspect of the present invention, a left and right front wheel is attached to a front portion of a vehicle body frame, and left and right rear wheels are attached to a rear portion thereof. In an intake device for an all-terrain vehicle equipped with a tank and an engine below the fuel tank, a flat plate-like guide plate is provided at a distance below a bottom surface of the fuel tank. The space between the air passage and the bottom of the tank is an air passage, the front end of the air passage is opened toward the front of the vehicle, and the rear end of the air passage is arranged near the air inlet of the intake duct connected to the air cleaner. It is characterized by doing.

According to a second aspect of the present invention, in the first aspect, a groove recessed inward of the fuel tank is formed in the bottom surface of the fuel tank from a front end to a rear end of the bottom surface, and the groove is formed in the air passage. It is characterized in that it is a part of.

According to a third aspect of the present invention, in the first or second aspect, the guide plate is directly mounted on a tank rail of a vehicle body frame, and the fuel tank is formed integrally with the guide plate on the tank rail. A space serving as the air passage is provided between the bottom surface of the tank and the guide plate by mounting with the interposed load receiver interposed therebetween.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the guide plate is formed integrally with a heat shielding portion that covers at least the inside of a fuel cock connected to the bottom of the fuel tank. Features.

[0010]

According to the first aspect of the present invention, a guide plate is provided at a distance below the bottom surface of the fuel tank and an air passage is provided between the guide plate and the tank bottom surface. Since the rear end of the air passage is located near the air inlet of the air cleaner, the air in the front of the fuel tank, which is not easily affected by engine heat, can be supplied to the air cleaner, and the filling efficiency of the engine can be improved. This has the effect of improving the engine output. Further, since the air inlet is open near the bottom of the fuel tank above the engine, it is difficult for water to enter the air cleaner even when running underwater.

According to the second aspect of the present invention, since the groove recessed inward of the fuel tank is formed in the bottom surface of the fuel tank, the area of the air passage can be increased and the amount of intake air to the engine can be further increased.

According to the third aspect of the present invention, since the load receiver is formed integrally with the guide plate and the fuel tank is mounted with the load receiver interposed, the air passage between the tank bottom surface and the guide plate has a simple structure. Can be secured.

According to the fourth aspect of the present invention, since the heat shield portion that covers the fuel cock of the fuel tank is formed integrally with the guide plate,
This has the effect of avoiding adverse effects due to engine heat and preventing generation of vapor and the like in the fuel.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 22 illustrating an embodiment of the present invention with reference to the accompanying drawings.
FIGS. 1 to 3 are views for explaining an intake device of a four-wheeled vehicle for running on uneven terrain according to an embodiment of the present invention. FIGS. 7 and 8 are left side and sectional views showing a portion where an engine guard is attached to the vehicle body frame, and FIGS. 9 and 10 are left side views showing a rear part of the vehicle body of a seat rail. Front view, rear view, FIG. 11 is a cross-sectional view of an engine mount cross pipe, FIG. 12 is a cross-sectional view showing an arrangement structure of a starter motor, and FIGS. 13 to 15 are right side views and plan views showing a V-belt chamber cooling structure, respectively. , Front view, FIGS. 16-18
Is a left side view showing the area around the fuel tank of the intake device,
19 and 20 are a plan view and a right side view showing a hood board mounting structure, and FIGS. 21 and 22 are cross-sectional views of the fender. It should be noted that the terms left, right, front and back in the present embodiment mean left, right, front and rear when viewed in a state of sitting on a seat.

In FIG. 1, reference numeral 1 denotes a four-wheeled motorcycle for running on rough terrain, which has an engine unit 3 mounted on a central portion of a body frame 2 and a steering handle 4, a fuel tank 5, and a saddle riding on the upper portion in order from the front. This is a schematic structure in which a mold sheet 6 is provided. A front wheel suspension device 7 is provided at the front of the body frame 2.
The left and right front wheels 8 with balloon tires are mounted via rear wheel suspension devices 9 at the rear, and the front wheels 8 and rear wheels 10 with left and right balloon tires are mounted at the rear. A front fender 11 and a rear fender 12 are respectively disposed above the front fender. A front bumper 13 made of a steel pipe is provided at a front end of the body frame 2.

As shown in FIGS. 4 to 6, the body frame 2 includes a pair of left and right cradle-shaped side frames 1.
5 are joined by a plurality of cross members 17, a pair of left and right seat rails 18 extending rearward of the vehicle body are connected to the rear portion of each side frame 15, and a rear cross member 16 is installed between the center portions of the seat rails 18. This is a so-called double cradle type.

Each of the side frames 15 is connected to the lower and upper ends of left and right front pipes 15a extending vertically, to an underpipe 15b and an upper pipe 15c extending rearward of the vehicle body, and to connect the rear parts of both pipes 15b and 15c. At the same time, a down tube 15d inclined obliquely rearward and downward is provided between the front portions. The underpipe 15b and the upper pipe 15c have a rectangular cross section. The underpipe 15b is formed linearly in a side view, and is slightly inclined forward. When the vehicle is running, obstacles are generated by the underpipe 15b.
This is to make it easier for the obstacle to escape backward when hit.

Each of the cross members 17 has a substantially hat shape in cross section which opens downward. With this shape, it is possible to directly attach each component described later to each cross member 17 without using a dedicated mounting bracket, thereby reducing the number of components while improving the frame strength. Is being planned. The cross member 17 is opened downward to prevent muddy water and the like from accumulating in the cross member 17.
Incidentally, the conventional cross member has a circular cross section, and a special mounting bracket is separately required to mount a component on the circular cross member, which has a problem that the number of components increases.

On the lower surface of the front part of the underpipe 15b,
As shown in FIGS. 7 and 8, an engine guard 19 made of sheet metal is provided.
The engine guard 19 is fixedly fastened to the cross member 17 with a bolt 19b.
The front end 19a of the engine guard 19 is formed to be bent upward so as to form a substantially continuous surface with the front bumper 13 in a side view, and the front end 19a is fixed to the bumper 13 by bolts 19c.

The rear cross member 16 has a substantially rectangular cylindrical shape in which a wide U-shaped member member 16b closing the opening is joined to a U-shaped member member 16a opening downward (FIG. 9). ), The upper end of a rear suspension 9a of the rear wheel suspension device 9 is connected to the lower surface of the rear cross member 16 via a bracket 20 having a hat-like cross section that opens rearward. Also, stay portions 16c are integrally formed on both left and right sides of the plate member 16b, and a rear end portion of an air cleaner 21, which will be described later, is fixed to the stay portions 16c by bolting (FIGS. 6 and 6). 9).

Between the rear end of the left seat rail 18 and the upper part of the underpipe 15b, a backstay 25 having a hat-like cross section, which opens outward, is bridged and joined so as to form a triangle. The back stay 25 is a press-formed product, and a bracket portion 25a for mounting a plurality of electrical components is integrally formed by press molding, thereby reducing the number of components and supporting strength of the seat rail 18. Is being improved. By the way,
The conventional back stay has a circular cross section, and a separate mounting bracket is required to mount an electric component to the back stay, which has a problem that the number of components increases.

A storage box 26 is provided between the rear ends of the left and right seat rails 18. The storage box 26 is fastened and fixed to left and right stays 26a, 26b fixed to the left and right seat rails 18, 18 with bolts 26e. Here, the right stay 26a is formed in an L-shaped cross section, and the side 26c thereof is in contact with the upper surface of the step 26d of the storage box 26. This prevents the storage box 26 from rotating around the axis of the bolt 26e (see FIGS. 9 and 10).

The engine unit 3 includes a water-cooled four-cycle parallel two-cylinder engine body 30 and an engine body 3.
And a V-belt drive type continuously variable transmission 31 which is connected and arranged on the right side in the width direction of the zero. The engine unit 3 has a body frame 2 with the crankshaft 32 directed in the vehicle width direction.
And the brackets 33a and 33b fixed to the down tube 15d and the cross members 17, respectively.
Supported by The engine body 30 is provided with a cylinder block 30b and a cylinder head 3 on a front upper surface of a crankcase 30a in which the crankshaft 32 is housed.
0c is laminated and fastened.

The cylinder head 30c is provided with a cross pipe 3 extending between the left and right upper pipes 15c, 15c.
4 supported. As shown in FIG. 11, the cross pipe 34 is formed by joining plate members 34b to both ends of a cylindrical member 34a arranged at the same height as the upper pipe 15c. The plate members 34b are joined to the upper surface of the upper pipe 15c. The bracket 35 is detachably fastened and fixed to the bracket 35 by a bolt 36.

Since the cross pipe 34 is configured to be detachable, the upper pipe 15c and, consequently, the seat rail 18 can be arranged at a lower position while improving the attachment and detachment workability when the engine unit 3 is mounted on or removed from the body frame 2. That is, at the time of engine attachment / detachment work, the cross pipe 34 is not obstructed by removing the cross pipe 34 from the vehicle body frame 2.
When the cross pipe 34 is fixed, it is necessary to arrange the cross pipe at a high position in order to prevent the cross pipe 34 from obstructing the engine attaching / detaching work. As a result, the upper pipe 15c, the seat The rail 18 has to be raised.

An oil filter 41 is arranged on the left side wall of the crankcase 30a, and a starter motor 42 is arranged on the front wall in parallel with the crankshaft 32. As shown in FIG. 12, the starter motor 42 is disposed between the pair of engine support brackets 33a fastened to the left and right down tubes 15d and in the recess 30d of the crankcase 30a. Since the dead space on the front side of the engine is effectively used in this manner, the starter motor 4
2 can be arranged compactly.

An exhaust pipe 37 is connected to the front wall of the cylinder head 30b. The exhaust pipe 37 extends to the rear of the vehicle through the right side of the upper part of the engine 30 after being led out to the front of the vehicle body. A muffler 38 is connected to the rear end of the exhaust pipe 37. This silencer 38 is disposed outside the right seat rail 18 as shown in FIG.
The muffler 38 includes a heat insulating plate 3 covering the upper and inner sides of the outer surface.
9 is attached (see FIG. 10). This prevents the exhaust heat from adversely affecting the air cleaner 21, the storage box 26, and the battery 40.

As shown in FIGS. 1 and 2, the battery 40 has a maintenance opening 6 formed below the seat 6.
The opening 6a can be opened and closed by detaching the sheet 6. Further, the battery 40 is offset on the opposite side (left side) of the muffler 38 and the V-belt continuously variable transmission 31 with respect to the vehicle body center line C, thereby improving the right and left weight balance.

Here, the exhaust pipe 37 may be arranged so as to pass below the engine and above the underpipe, or on the opposite side of the V-belt type continuously variable transmission in the crankshaft direction and below the flywheel magneto. Good. In this case, the adverse effect on the intake system due to the exhaust heat can be suppressed.

A carburetor 46 is connected to the rear wall of the cylinder head 30b via an intake pipe 45, and the air cleaner 21 is connected to the carburetor 46 via an intake duct 47. The air cleaner 21 is disposed between the left and right seat rails 18 and below the seat 6, and the battery 40 and the storage box 26 are disposed behind the air cleaner 21.

A belt case 51 for forming the belt chamber 50 independently of the crank chamber is fastened to the right side wall of the crankcase 30a.
A belt-type continuously variable transmission 31 is provided. In the continuously variable transmission 31, as shown in FIGS. 13 and 14, a V-belt 55 is wound around a driving pulley 52 attached to the right end of a crankshaft 32 and a driven pulley 54 attached to an output shaft 53. It has a turned structure.

The driving pulley 52 is movable in the axial direction by the centrifugal force of the fixed pulley 52a fixed to the kunk shaft 32 and the weight 56 to change the pulley diameter.
2b. Further, blades 52c for blowing air are integrally formed on the outer peripheral edges of the fixed pulley 52a and the movable pulley 52b. During the rotation of the engine, the blades 52c always rotate to cool through a cooling air introduction duct 65 described later. Air is sucked into the belt chamber 50.

The driven pulley 54 is connected to the output shaft 53
And a movable pulley 54b mounted movably in the axial direction via a centrifugal clutch 57. The output from the output shaft 53 is transmitted to the front wheels 8 and the rear wheels 10 via the front wheel drive shaft 58 and the rear wheel drive shaft 59.
Is transmitted to

The cooling structure of the belt chamber 50 will be described. The belt case 51 has a substantially U-shaped cross section including a side wall 51e located at the right end in the vehicle width direction and a peripheral wall 51f surrounding the side wall 51e. A cooling air introduction port 51a communicating with the inside of the belt chamber 50 is formed substantially at the center of the upper part of the peripheral wall 51f in the front-rear direction. In addition, the peripheral wall 5
Air outlets 51b are provided at the front and rear of 1f, respectively.
A cooling air outlet duct 60, 61 is connected to each outlet 51b. Each of the outlet ducts 60 and 61 extends toward the upper part of the engine and merges to the right of the cylinder head 30c. An outlet 62a of the merging portion 62 is opened so as to be directed to the vicinity of the ignition plug of the cylinder head 30c. I have.

Here, the inside of the air cleaner 21 is defined by a partition wall 22 extending in the front-rear direction into an intake chamber 21a and a cooling air chamber 21b. Elements 63, 64 for filtering air are provided in each of the chambers 21a, 21b. Are arranged. The cooling air introduction duct 65 is connected to a portion below the element 64 of the cooling air chamber 21b, and the cooling air introduction duct 65 is connected to the cooling air introduction port 51a.

The element 6 of the intake chamber 21a
The portion below 3 is connected to the above-described carburetor 46 via an intake duct 47. Note that the element 64 on the cooling air chamber 21b side is not necessarily provided.

The upper wall of the air cleaner 21 is connected to an outside air intake duct 66 communicating with the intake chamber 21a and a cooling air intake duct 67 communicating with the cooling air chamber 21b. The outside air suction duct 66 extends slightly obliquely upward and forward, and has a suction port 66a of the duct 66.
Opens upward below the rear end of the fuel tank 5 (see FIGS. 4 and 16).

The cooling air intake duct 67 extends substantially linearly forward, and the intake 67 a of the duct 67 opens forward and downward below the rear end of the fuel tank 5. The suction port 67a and the suction port 66a are arranged at positions displaced in the vertical direction so that no intake interference occurs, and open in different directions. Thus, the combustion air is supplied from the outside air intake duct 66 to the air cleaner 2.
1, the intake duct 47 and the carburetor 4
6, is supplied to the engine body 30 through the intake pipe 45. The air for cooling the belt chamber is supplied by a cooling air intake duct 6.
7 is introduced into the belt chamber 50 through the cooling air chamber 21 b of the air cleaner 21 and the cooling air introduction duct 65.
The air that has cooled the inside of the belt chamber 50 is supplied to each outlet duct 6.
The fuel gas is blown through the cylinder head 30c near the spark plug through 0,61.

The fuel tank 5 is disposed above the engine body 30, as shown in FIGS.
The left and right upper pipes 15c are bolted and fixed on brackets 68, 69 which are provided upright at the front end and the rear end. The fuel tank 5 is formed by joining an upper tank 5b to a lower tank 5a, and a front end 6a of a seat 6 is in contact with a rear wall of the fuel tank 5 so as to cover the lower tank 5b.

A recess 70 is formed in the front of the fuel tank 5, and the steering shaft 4 a of the steering handle 4 passes through the recess 70. The left and right front ends of the fuel tank 5 are connected to the steering shaft 4a.
Extending forward. This steering shaft 4
a is pivotally supported by a support bracket 71 erected between the above-mentioned Ach pipes 15c and 15c and a support member 72 fixed to the front pipe 15a (see FIG. 4).

On the upper surface 5c of the fuel tank 5, a fuel cap 75 for opening and closing a fuel filler port and a fuel meter 76 for displaying a fuel amount are provided. The fuel meter 76 is disposed in front of the fuel cap 75 and behind the steering handle 4. Thus, the fuel meter 76
Is disposed between the steering handle 4 and the fuel cap 75, so that it is easy to check the remaining fuel amount while sitting on the seat 6, and that the steering handle 4 is not covered with vegetation. The fuel meter 76 functions as a protective member for preventing plants and the like from hitting the fuel meter 76 during traveling on level ground.
6 can be prevented.

A fuel reservoir 77 is formed on the bottom surface 5d of the fuel tank 5 so as to protrude downward. A fuel cock 78 is provided on the bottom surface of the fuel reservoir 77 with an opening / closing lever 78.
To the outside in the vehicle width direction. The fuel cock 78 is connected to the carburetor 46 via a fuel supply pipe 79, and is disposed on the left side between the left and right upper pipes 15c, 15c. Thereby, opening and closing operations can be performed while sitting on the seat 6.

Next, an intake device for supplying air to the air cleaner 21 will be described. Below the bottom surface 5d of the fuel tank 5, a flat plate-like guide plate 80 large enough to cover substantially the entire bottom surface 5d is provided. The guide plate 80
Has a heat-shielding function for preventing engine heat from being transmitted to the fuel tank 5. The guide plate 80 is made of rubber, and its left and right edges 80a and 80b are placed on the upper surfaces of the left and right upper pipes 15c.
c is fixed to the upper pipe 15c by a fastening member 81. At the left and right rear ends of the guide plate 80, mounting pieces 80d extending upward are integrally formed, and each of the mounting pieces 80d is screwed and fixed to the bracket 69.

The fuel pool 77 of the guide plate 80
A bag-shaped heat shield 83 is formed integrally and bulging out at a portion facing the. The fuel cock 78 is arranged in the heat shield 83. Note that a cutout hole 82 for opening and closing the operation lever 78a of the cock 78 is formed in the heat shield 83 so as to open outward.

The left and right edges 80a, 8 of the guide plate 80
A load receiving portion 84 is integrally formed at the center in the front-rear direction of Ob so as to protrude upward. The bottom surface 5 d of the fuel tank 5 is supported by the load receiving portion 84, and the load receiving portion 84 is connected to the upper pipe 1 by a band member 85.
5c.

As described above, the bottom surface 5 d of the fuel tank 5 is in contact with the load receiving portion 84, and the space formed between the bottom surface 5 d and the guide plate 80 serves as an air passage 86. The front end of the air passage 86 is open toward the front of the vehicle body, and the rear end is directed to the suction port 66a of the outside air suction duct 66 connected to the air cleaner 21 and the suction port 67a of the cooling air suction duct 67. Open.

An inverted V-shaped groove 87 is formed in the bottom surface 5d of the fuel tank 5 so as to be recessed inward of the tank. The groove 87 increases the area of the air passage 86. This constitutes an intake device that supplies the traveling wind from the front of the air passage 86 to the intake ports 66a and 67a.

Next, the fender structure will be described. The left and right front fenders 11 and 11 and the left and right rear fenders 12 and 12 are two-split types in which over fenders 11b and 12b are connected to the left and right outer edges of the fender bodies 11a and 12a, respectively. Fender body 11a, 12
a is a hard resin, and over fenders 11b and 12b
Is made of a soft resin that is relatively softer than the fender bodies 11a and 12a, thereby suppressing damage to the over fenders 11b and 12b when traveling on uneven terrain with vegetation. Also, the over fenders 11b and 12b
In the event that is damaged, it can be replaced individually, which is advantageous in terms of cost.

The front of the front fender body 11a has a left,
A pair of right headlights 90 is mounted, and the headlights 90 are directly attached to the fender body 11a (see FIGS. 2 and 3). As a result, the number of components is reduced as compared with the case where the components are attached to the vehicle body frame via the bracket.

The combined structure of the front fender 11 and the rear fender 12 is as follows. The front and rear fenders 1
Since the mating structures of the rear fenders 1 and 12 are the same,
Only 2 will be described.

The outer edge of the fender main body 12a is
9, as shown in FIG. 22, the first mating portion 91 is bent and formed so as to open downward. A second mating portion 92 is formed on the inner edge of the over fender 12b so as to be in close contact with the upper surface of the first mating portion 91. The second mating portion 92 is provided with three recesses 93 at intervals. It is recessed (see FIG. 2).

The vertical wall 93a in the recess 93 and the vertical wall 93
The first wall 91a of the first mating portion 91 which is in contact with a is joined by a rivet 94. The rivet 94 is formed by inserting a wedge member 96 into a cylindrical rivet body 95 having a slit 95a formed in the axial direction, thereby expanding the leading end of the rivet body 95 so that the two vertical walls 93a,
91a. Reference numeral 97 denotes a washer attached to the rivet body 95.

As described above, the first and second mating portions 91, 91 are provided on the fender body 12a and the over fender 12b, respectively.
Since the 92 is formed by bending, it is possible to increase the allowance for joining the two, to facilitate the joining operation, and to improve the joining strength. Further, since the washer 97 is attached to the rivet 94, the rivet 94 can be prevented from coming off, and the joining strength can be further improved. Further, since the rivet 94 is arranged in the recess 93, it is difficult for the obstacle to hit the rivet 94, so that the rivet 94 can be prevented from coming off.

Next, the mounting structure of the footboard will be described. A footboard 100 for supporting the occupant's foot is disposed below the left and right portions of the seat 6, specifically, outside the left and right under pipes 15b. As shown in FIGS. 19 and 20, the foot board 100 includes a pair of front and rear support brackets 101 and 102, and a flat board body 103 disposed on the upper surfaces of the support brackets 101 and 102. .

The board body 103 is made of sheet metal, has a reinforcing bead 103e extending in the front-rear direction, and has a number of anti-slip burrings 13f. Further, the outer rim and the inner rim of the board main body 103 are integrally formed with ridges 103a, respectively, thereby preventing the occupant from stepping off.

Flanges 103b, 103b are formed on the front edge and the rear edge of the board body 103 so as to rise upward, and the respective flanges 103b are inner edges of the front and rear over fenders 11b, 12b. Bolts. That is, the front and rear edges of the board body 103 are joined to the fender bodies 11a and 12a via the softer over fenders 11b and 12b. As shown in FIG. 21, a rib 11c is integrally formed on the inner surface of the front over fender 11b so as to extend in the vehicle width direction, and the rib 11c projects forward so as to cover above the flange portion 103b. I have. As a result, the front wheel 8
This prevents the muddy water wound up from leaking to the surface of the board body 103 along the inner surface of the over fender 11b.

The ridge 103a forming the outer edge of the board body 103 is located outside the vehicle width direction outer edge 8a in the vehicle width direction when the front wheel 8 is in the maximum steering angle state (see FIG. 19). The board main body 103 is slightly inclined forward and upward, so that the occupant can easily step on the forward movement of the weight when traveling downhill or during deceleration.

Each of the support brackets 101 and 102 is formed by welding square tubular stays 101b and 102b to thick plate bracket bodies 101a and 102a, and the board body 103 is bolted to each of the stays 101b and 102b. It is fastened and fixed by 103f. The board body 103 is attached to the stays 101b and 102b by welding.
May be fixed.

A pair of front and rear foot brackets 104, 104 are welded to the outer surfaces of the left and right under pipes 15b (see FIG. 5). The bracket main bodies 101a and 102a are detachably fastened to the foot brackets 104 by bolts 105a and nuts 105b.

A brake pedal 106 is provided below the board body 103 on the right side. This brake pedal 106 is a base 106b of a pedal arm 106a.
Are pivotally supported on the bracket main body 103 so as to swing freely, and the tread portion 106c at the front end is projected upward from a pedal opening 103c formed in the board main body 103. A stopper member 108 is fixed to the pedal arm 106a, and the stopper member 108 contacts an abutment seat 103d protruding from a lower surface of the board main body 103 to regulate an upward rotation position of the brake pedal 106. I do.

A support shaft 107 is fixed to the front edge of the bracket body 102a so as to protrude in the vehicle width direction. The support shaft 107 pivotally supports a base 106b of the pedal arm 106a so as to be able to swing up and down. ing. A support piece 109 extending upward is integrally formed at the rear edge of the bracket body 102a. An outer tube 111 of the brake cable 110 is fixed to the support piece 109. The inner tube 112 is connected to the pedal arm 10a.
6a is connected to an arm 106d fixed to the base 106b. Reference numeral 113 denotes a return spring that urges the brake pedal 106 upward, and reference numeral 114 denotes a control cable that enables switching between forward and reverse only when the brake is depressed.

Next, the operation and effect of this embodiment will be described. According to the belt chamber cooling structure of the present embodiment, the air cleaner 21 is separated from the intake chamber 21 a and the air cooling chamber 2 by the partition wall 22.
1b, and the air cooling chamber 21b and the belt chamber 50 are connected by the cooling air introduction duct 65, so that the air filtered by the air cleaner 21 can be supplied into the belt chamber 50, and dust and dirt can be removed. Intrusion can be prevented, and the life of the V-belt 55 can be extended.

The air cooling chamber 2 of the air cleaner 21
Since the outside air introduction duct 67 is connected to 1b and the introduction port 67a of the outside air introduction duct 67 is opened below the fuel tank 5, even when the vehicle runs underwater in which the front and rear wheels 8, 10 are submerged. Water hardly enters the outside air introduction duct 67, so that water can be prevented from entering the belt chamber 50 and deterioration of the V belt 55 can be prevented.

In this embodiment, the suction port 66a of the intake duct 66 communicating with the intake chamber 21a of the air cleaner 21 is provided.
And the introduction port 67a of the outside air introduction duct 67 communicating with the air cooling chamber 21b are vertically displaced from each other, and are opened in a different direction from the upward and forward directions. Interference due to the pressure difference can be avoided, and the cooling air can be supplied stably.

According to the intake device of this embodiment, the guide plate 80 is provided below the fuel tank 5, and the space between the guide plate 80 and the tank bottom surface 5 d is the air passage 86. Is opened toward the front of the vehicle body, and the rear side is opened near the inlet 66a of the outside air intake duct 66 and the inlet 67a of the outside air introduction duct 67, so that the traveling wind is passed through the air passage 86. Air cleaner 21
And the amount of air to the engine 30 and the belt chamber 50 can be secured, so that the engine output and the cooling efficiency can be improved.

Further, since the inverted V-shaped groove 87 is formed in the bottom surface d of the fuel tank 5, the area of the air passage 86 can be increased, and the amount of air to the engine body 30 and the belt chamber 50 can be further increased. .

The rubber guide plate 80 is mounted on the upper surfaces of the left and right upper pipes 15c, and a load receiving portion 84 is integrally formed on the guide plate 80 so as to protrude therefrom. 5 on the tank bottom 5
The space between the air passage 86 and the guide plate 80 can be increased, and the area of the air passage 86 can be increased from this point as well.
Further, since the load receiving portion 84 is made of rubber, vibration of the fuel tank 5 can be suppressed by its elasticity.

Since the heat shield 80d for covering the fuel cock 78 is formed integrally with the guide plate 80, generation of vapor and the like due to engine heat can be prevented.

According to the footboard mounting structure of this embodiment, the footboard 100 is composed of a pair of front and rear support brackets 101 and 102 and a flat board body 103, and the support brackets 101 and 102 are attached to the underpipe 15b. Since it is detachably fastened by the bolt 105a and the nut 105b, the footboard 100 can be mounted on an assembly line. This makes it possible to reduce the size of the body frame 2 in the vehicle width direction in a manufactured state, to facilitate handling during transportation, and to reduce the size of a coating bathtub when performing electrodeposition coating.

When the food board 100 is deformed due to a collision with a stone or the like during traveling, the board body 103 or the support brackets 101 and 102 can be replaced individually, so that the conventional frame can be modified. It is possible to avoid the problem that it becomes necessary and reduce the repair cost.

In this embodiment, the support bracket 10
Since 2 is also used to support the brake pedal 106, a dedicated bracket for supporting the brake pedal 106 is not required, and the cost can be reduced.

Further, since the ridge 103a constituting the outer edge of the board body 103 is located outside the vehicle width direction outside edge 8a of the front wheel 8 in the maximum steering angle state, the board body 103 functions as a guard. For example, it is possible to prevent an obstacle from hitting the tire when the vehicle retreats, and to improve running performance.

Since the front and rear edges of the board body 103 are joined to the fenders 11 and 12, it is possible to reliably prevent the mud and the like jumped up by the front and rear wheels 8, 10 from hitting the occupant. Also, over fenders 11b, 12b softer than the fender body
The board body 103 is connected to the fender body 11a through
Since the board body 103 is joined to the frame 12a, a dimensional error that easily occurs when the board body 103 is detachably attached to the frame can be absorbed.

[Brief description of the drawings]

FIG. 1 is a right side view of an all-terrain four-wheeled vehicle according to an embodiment of the present invention.

FIG. 2 is a plan view of the four-wheeled vehicle.

FIG. 3 is a front view of the four-wheeled vehicle.

FIG. 4 is a right side view of a body frame of the four-wheeled vehicle.

FIG. 5 is a bottom view of the vehicle body frame.

FIG. 6 is a plan view of the rear half of the vehicle body frame.

FIG. 7 is a left side view of an engine guard portion of the vehicle body frame.

8 is a sectional front view of the engine guard portion (a sectional view taken along line VIII-VIII in FIG. 7).

FIG. 9 is a left side view showing a seat rail of the vehicle body frame.

FIG. 10 is a rear view of a rear end portion of the vehicle body of the seat rail.

FIG. 11 is a sectional view showing an engine mount cross pipe of the four-wheeled vehicle.

FIG. 12 is a sectional view showing a starter motor arrangement structure of the engine.

FIG. 13 is a right side view showing a V-belt chamber cooling structure of the four-wheeled vehicle.

FIG. 14 is a plan view of the V-belt chamber cooling structure.

FIG. 15 is a front view of an air cleaner having the V-belt chamber cooling structure.

FIG. 16 is a side view of a fuel tank of the four-wheeled vehicle.

FIG. 17 is a front view of the fuel tank.

FIG. 18 is a plan view of the fuel tank.

FIG. 19 is a plan view showing a footboard mounting structure of the four-wheeled vehicle.

FIG. 20 is a right side view of the footboard mounting structure.

21 is a cross-sectional view of the fender of the four-wheeled vehicle (XX in FIG. 19).
(I-XXI section view).

FIG. 22 is a sectional view of the fender (XXII-XXII in FIG. 19).
(Line sectional view).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Four-wheel motorcycle for running on uneven terrain 2 Body frame 5 Fuel tank 5d Bottom surface 8 Front wheel 10 Rear wheel 15c Upper pipe (tank rail) 21 Air cleaner 30 Engine 66 External air intake duct (intake duct) 66a Intake port (air inlet) 80 Guide plate 83 Heat shielding part 84 Load receiving part 86 Air passage 87 Groove part

Claims (4)

[Claims] 1. A left and right front wheel is attached to a front portion of a vehicle body frame, and a left and right rear wheel is attached to a rear portion. A fuel tank is mounted between the front and rear wheels of the vehicle body frame and a fuel tank is provided below the fuel tank. In an air intake device for an off-road vehicle equipped with an engine, a flat guide plate is provided at a distance below a bottom surface of the fuel tank, and an air passage is provided between the guide plate and the bottom surface of the tank. Wherein the front end of the air passage is opened toward the front of the vehicle, and the rear end of the air passage is arranged near the air intake of an intake duct connected to an air cleaner. Vehicle intake system. 2. The fuel tank according to claim 1, wherein a groove is formed in the bottom surface of the fuel tank inwardly from the front end to the rear end of the bottom surface, and the groove serves as a part of the air passage. An intake device for a vehicle for traveling on uneven terrain, characterized in that: 3. The vehicle according to claim 1, wherein the guide plate is directly mounted on a tank rail of the vehicle body frame, and the fuel tank is provided on the tank rail with a load receiver integrally formed with the guide plate. An air intake device for an all-terrain vehicle, wherein a space serving as the air passage is provided between the bottom surface of the tank and the guide plate by being mounted. 4. The rough terrain according to claim 1, wherein a heat shield portion for covering at least the inside of a fuel cock connected to the bottom of the fuel tank is formed integrally with the guide plate. Air intake device for traveling vehicles.