JP2000233658A - Component arrangement structure for drive device in riding type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the responsiveness of an internal combustion engine body, to prevent the outer shape of a vehicle from becoming too large by arranging the components of a drive device compactly, and to improve the maneuverability of the vehicle by concentrating mass in the travel drive device of the vehicle. SOLUTION: A seat 11 is supported on the upper face side of a body frame 3, and an internal combustion engine body 53 is supported on the body frame 3 below the front end section of the seat 11. The internal combustion engine body 53 is provided with a crankcase 54 and a cylinder 55 protruded upward to the front from the crankcase 54. A carburetor 57 and an air cleaner 58 are connected to the cylinder 55. The carburetor 57 is arranged above the cylinder 55, and the air cleaner 58 is arranged in the front of the carburetor 57 above the protruded end section of the cylinder 55. A fuel tank 59 is arranged behind the carburetor 57 above the crankcase 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a saddle type front and rear
More particularly, the present invention relates to a structure for disposing components such as a carburetor, an air cleaner, and a fuel tank around an internal combustion engine main body.

[0002]

2. Description of the Related Art Conventionally, a saddle-ride type vehicle has been disclosed in
There is one disclosed in Japanese Patent No. 58368.

According to the above publication, a pair of left and right front and rear wheels are respectively suspended from a vehicle body frame, and a seat on which a rider can sit in a saddle riding manner is supported on the upper surface side of the vehicle body frame. Below the front end of the seat, the body frame supports an internal combustion engine main body that constitutes a driving device for driving. The internal combustion engine main body includes a crankcase and a cylinder that projects forward and upward from the crankcase. Have. A carburetor and an air cleaner are connected to the cylinder in this order, and a fuel tank for storing fuel supplied to the cylinder through the carburetor is provided,
Further, an exhaust pipe extending from the cylinder is provided.

When the internal combustion engine main body is driven, air outside the main body is sucked into the cylinder through the air cleaner and the carburetor in order. At the same time, the fuel supplied from the fuel tank to the carburetor is also sucked into the cylinder together with the sucked air, where it is provided for combustion.

On the other hand, the exhaust gas generated by the combustion is discharged to the rear of the vehicle body through the exhaust pipe.

[0006] The rear wheels are driven by the driving force output from the internal combustion engine body by the combustion, and the vehicle can run on a running surface such as a rough terrain.

[0007]

When the rider performs an acceleration operation while the vehicle is running, it is desirable that the internal combustion engine body responds quickly to the operation to obtain a desired acceleration.

Therefore, it is conceivable to dispose a carburetor above the cylinder to down-draft the air and fuel sucked into the cylinder, thereby improving the responsiveness.

However, in the above-mentioned conventional technology, since the fuel tank is disposed near the upper part of the cylinder, even if the vaporizer is disposed above the cylinder as described above, the fuel tank is disposed above the fuel tank. The tank is in the way and cannot be done easily.

Therefore, it is conceivable to change the arrangement position of the fuel tank and dispose the carburetor above the cylinder. However, simply doing so makes the arrangement of the components of the drive unit compact. Installation is obstructed, and the outer shape of the vehicle may be excessively large. In addition, there is a possibility that the fuel tank and the internal combustion engine main body, which are heavy objects, may be largely separated from each other, which may cause a decrease in concentration of the mass and a decrease in maneuverability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is intended to improve the responsiveness of an internal combustion engine body in a driving device for a vehicle. It is an object of the present invention to arrange components of the apparatus compactly so that the outer shape of the vehicle does not become excessive, and to concentrate the mass to improve the maneuverability of the vehicle.

[0012]

The structure for disposing the components of the drive device in the saddle-ride type vehicle according to the present invention for solving the above-mentioned problems is as follows.

According to the first aspect of the present invention, a pair of left and right front and rear wheels 4 and 6 are suspended from the vehicle body frame 3, respectively, and a seat 11 on which a rider can sit in a saddle type is supported on the upper surface side of the vehicle body frame 3. At the same time, the internal combustion engine main body 53 is supported by the vehicle body frame 3 below the front end of the seat 11, and the internal combustion engine main body 53
A cylinder 55 protruding forward and upward from the crankcase 54 is provided. A carburetor 57 and an air cleaner 58 are connected to the cylinder 55 in this order, and supplied to the cylinder 55 through the carburetor 57. In a saddle-ride type vehicle provided with a fuel tank 59 for storing fuel,

A vaporizer 57 is disposed above the cylinder 55, and the air cleaner 58 is disposed in front of the vaporizer 57 above a protruding end of the cylinder 55.
On the other hand, above the crankcase 54, the carburetor 57
The fuel tank 59 is disposed behind the fuel tank.

According to a second aspect of the present invention, in addition to the first aspect, the upper surface of the intermediate portion 62 in the front-rear direction of the seat 11 is used as a rider's seating surface, and the upper surface of the front end portion 63 of the seat 11 is used as the intermediate surface. In a saddle-ride type vehicle having an inclined surface that rises forward from the portion 62 side,

At least a part of the vaporizer 57 is housed inside the front end 63 of the sheet 11.

[0017]

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

In the figure, reference numeral 1 denotes a saddle-ride type and off-road four-wheeled vehicle, and an arrow Fr indicates the front, and the following left and right refer to the width direction of the vehicle body 2 of the vehicle 1 toward the front. Shall be referred to.

The vehicle body 2 has a vehicle body frame 3 as its main body. A pair of left and right front wheels 4 and 4 are independently suspended on the front portion of the body frame 3 via suspensions so as to be steerable, and a pair of right and left rear wheels are respectively mounted on the rear portion of the body frame 3 via other suspensions 5. 6, 6 are independently suspended. The body frame 3 of the vehicle body 2 is supported on the running surface 7 by the suspensions 5 and the wheels 4, 6.

A handle 10 protruding upward is supported at the front of the body frame 3 of the body 2 so as to be steerable. The handle 10 and the front wheels 4 are connected to each other in an interlocked manner. I have. A seat 11 on which a rider can sit in a saddle riding manner is supported on the upper surface side of the body frame 3 behind the handle 10. The handle 10 and the seat 11 are disposed on a vehicle body center 12 that passes through substantially the center in the width direction of the vehicle body 2 in plan view.

The vehicle body 2 is provided with a foot step 14 which is disposed below each front outside of the seat 11 and outside each lower end of the vehicle body frame 3 and is supported by the vehicle body frame 3. I have. The rider's feet on the seat 11 can be placed on the foot step 14, and the steering operation of the handle 10 can be performed by the rider.

The vehicle body 2 includes a front fender 15 for covering each front wheel 4 from above, a rear fender 16 for covering each rear wheel 6 from above, a front edge of the seat 11 and a left and right front fender in plan view. A cover body 17 covers, from above, a space surrounded by the inner edges 15 and 15 on the vehicle body center 12 side, and these 15 to 17 are also supported by the vehicle body frame 3, respectively.

A driving device 20 is provided for driving the rear wheels 6, 6 to enable the vehicle 1 to travel. Further, a switching operation means 21 is provided, which is interlocked with the driving device 20 and is capable of switching between forward and backward traveling of the vehicle 1.
Further, a travel braking device 22 that brakes the rear wheels 6 and 6 to enable the vehicle 1 to travel and a parking brake device 23 that enables braking of the vehicle 1 during parking is provided. .

Referring to FIGS. 1 to 3, the vehicle body frame 3
Are formed by a metal pipe material, and form a pair of left and right upper frames 26 and 26, which form the upper part of the body frame 3 and extend longitudinally, and the lower part of the body frame 3, A pair of left and right lower frames 27, 27 extending long, and upper frames 26 extending vertically
Vertical connecting frame 28 for connecting the lower frame 27 and the lower frame 27, and right and left frames 26 to 2 extending in the width direction of the vehicle body 2.
And a horizontal connecting frame 29 for connecting the 8 to each other.

1 to 4, each of the suspensions 5 is of a right and left independent suspension type and is called a wishbone type as described above, and is disposed outside the rear end of the body frame 3. An end on the vehicle body center 12 side is provided with an upper arm 33 and a lower arm 34 pivotally supported by a pivotal support 32 on the side of the rear end of the vehicle body frame 3. Each outer end of the upper arm 33 and the lower arm 34 is provided. Are swingable up and down around the respective pivotal supports 32.

Each of the suspensions 5 has a hub 36 pivotally supported by another pivotal support 35 at each of the swinging ends of the upper arm 33 and the lower arm 34. An axle 39 is supported so as to be rotatable about an axis 38 extending in the direction.
The wheel 6 is supported on the axle 39 so as to rotate with the wheel. When the upper arm 33 and the lower arm 34 swing up and down around the pivotal support 32, respectively, the hub 36, the axle 39, and the wheel 6 swing so as to move substantially parallel up and down.

The suspension 5 is provided with a shock absorber 40 erected between the upper part of the rear end of the body frame 3 and the swinging end of the lower arm 34 and urged in the extending direction. ing.

When an impact force is applied to the rear wheels 6 and 6 from the running surface 7 while the vehicle 1 is running, the suspension 5 operates, that is, the upper arm 33 and the lower arm 34 swing vertically. The vertical movement of each of the rear wheels 6, 6 with respect to the vehicle body 2 is allowed within a predetermined variable width range in the vertical direction, and the shock absorber 40 expands and contracts with the vertical movement, thereby reducing the impact force. It is supposed to be.

In FIGS. 1 to 3, the driving device 20
An internal combustion engine 4 supported by the body frame 3 and serving as a drive source
3, a power transmission device 44 connected to the rear side of the internal combustion engine 43, and the internal combustion engine 43 and the power transmission device 44 provided separately from each other and provided in a frame at the rear end of the body frame 3. A gear type reduction gear 46 disposed and supported by the support means 45 on the vehicle body frame 3, and a chain winding means 47 for linking the reduction gear 46 to the power transmission device 44.
And a pair of left and right interlocking means 49, 49 for interlockingly connecting the wheels 6 to the speed reducer 46.

The internal combustion engine 43 is provided with an internal combustion engine main body 53 which is a four-cycle engine using gasoline as fuel. The internal combustion engine main body 53 is located below the front end of the seat 11 and halfway in the front-rear direction of the vehicle body frame 3. A crankcase 54 disposed in the frame of the vehicle and supported by the body frame 3 between the front and rear wheels 4 and 6, and a cylinder 55 protruding forward and upward from the upper surface of the crankcase 54. And Further, the internal combustion engine 43 is connected to a rear upper surface of the cylinder 55 and extends upward from the rear upper surface, and an extension end of the intake pipe 56 disposed above the cylinder 55 and extends above the cylinder 55. Vaporizer 5 connected to
7, an air cleaner 58 disposed above the protruding end of the cylinder 55 and in front of the carburetor 57 and connected to the carburetor 57;
And a fuel tank 59 for storing fuel supplied to the fuel tank. The internal combustion engine body 53 may be a two-stroke engine.

In the above case, the intake pipe 56 and the carburetor 57 are disposed near the cylinder 55 in the frame of the body frame 3.
Below the cover body 17, above the protruding end of the cylinder 55, and in front of the carburetor 57, in the space 60 surrounded by these 17, 55, 57, the air cleaner 58. Its front, which is almost whole, is arranged. In the frame of the vehicle body frame 3, the fuel tank 59 is disposed above the crankcase 54 and near the rear of the carburetor 57 in a space 61 surrounded by these 54 and 57 and the seat 11. ing.

The upper surface of the middle portion 62 of the seat 11 in the front-rear direction serves as a main seating surface for the rider. The upper surface of the front end portion 63 of the seat 11 rises forward from the halfway portion 62 side. In other words, when the vehicle 1 travels on an off-road rough terrain, the rider on the halfway portion 62 is prevented from moving further forward unintentionally by the front end portion 63. Thus, a stable sitting posture with respect to the seat 11 is ensured.

The internal combustion engine main body 53 is mounted on the seat 11
The spaces 60 and 61 are extended upward by the interior of the front end 63 of the seat 11 which is raised forward as described above. The vaporizer 57 is provided inside the section 63.
, A rear part that is at least a part of the air cleaner 58, and an upper part that is at least a part of the fuel tank 59 are housed. That is, the interior of the front end portion 63 of the seat 11 of the vehicle 1 which is an off-road vehicle is used, and the carburetor 57, the air cleaner 58,
And the fuel tank 59 are compactly arranged.

The internal combustion engine 43 has an exhaust pipe 64 extending from the front lower surface of the cylinder 55 toward the rear of the vehicle body 2. The exhaust pipe 64 has a small diameter extending from the cylinder 55. The exhaust pipe main body 65 and the exhaust pipe main body 65
And a muffler 66 extending further rearward from the extension end of the muffler 66. After the exhaust pipe main body 65 once extends forward and downward from the front lower surface of the cylinder 55, it is folded back so as to extend rearward through the body frame 3 and the vicinity of each outer side (right side) of the cylinder 55, The extended end side of the exhaust pipe main body 65 and the muffler 66 are disposed above the speed reducer 46 in a frame at the rear upper portion of the vehicle body frame 3.

When the internal combustion engine main body 53 is driven, the air outside the main body is sucked into the cylinder 55 through the air cleaner 58 and the carburetor 57 in order. Also,
At the same time, the fuel supplied from the fuel tank 59 to the carburetor 57 is supplied to the cylinder 5 together with the intake air.
5 where it is burned.

On the other hand, the exhaust gas generated by the combustion is discharged to the rear of the vehicle body 2 through the exhaust pipe 64.

The internal combustion engine body 53
The rear wheels 6, 6 are driven by the driving force output from the vehicle, and the vehicle 1 can travel on a running surface such as a rough land.

In FIG. 1 and FIG.
Includes a transmission case 69 connected to the crankcase 54, and an output shaft 70 supported by the transmission case 69 and outputting a driving force input from the internal combustion engine main body 53.

In all the drawings, the speed reducer 46 is a rigid metal which constitutes an outer shell, is disposed in the frame at the rear end of the body frame 3 and is supported by the body frame 3 by the support means 45. Casing 71 and this casing 7
An input shaft 73, an intermediate shaft 74, an output shaft 75, and a reverse shaft 76, which are housed inside the casing 1 and are rotatably supported by the casing 71 around an axis 72 extending in the width direction of the vehicle body 2. A gear set 77 supported on each of the shafts 73 to 76 so as to be interlockably connected to each other.
The shafts 73 to 76 are arranged in parallel so that the respective shaft centers 72 are parallel to each other.

In the above case, the casing 71 is
0, and corresponds to a fixed-side member supported by the vehicle body 2. Further, the casing 71 is divided into left and right parts, and includes an upper part composed of upper casings 71a, 71a detachably fixed to each other, and a lower casing 71 detachably fixed to the upper part.
b. The casing 71 may be composed of left and right casings which are divided into left and right parts and are detachably fixed to each other.

The chain winding means 47 is attached to an output shaft 70 of the power transmission device 44 and is rotatably supported by the power transmission device 44. A driven chain wheel 80 attached to one end of the input shaft 73 outside the one side (left side) and rotatably supported by the reduction gear 46; and one side (left side) of the body frame 3 ) Is provided with an endless chain 81 which is wound around a drive chain wheel 79 and a driven wheel chain 80 near the outside.

Referring to FIGS.
Is provided with a constant velocity joint 83 interlockingly connected to the output shaft 75 of the speed reducer 46, and another constant velocity coupling 84 interlockingly connected to the constant velocity coupling 83 and interlockingly connecting the axle 39. I have. The constant velocity joint 83 has a substantially cylindrical outer ring 86 formed integrally with the output shaft 75 on the axis 72 of the output shaft 75, and an inner ring 87 fitted inside the outer ring 86.
A ball 88 fitted over each engagement groove formed in the outer ring 86 and the inner ring 87 to rotate the inner ring 87 about the axis 72 together with the outer ring 86;
And a cage 89 for holding the inner ring 87 at a predetermined position between the outer ring 86 and the inner ring 87, and a drive that extends outside the inner ring 87 in the width direction of the vehicle body 2 and has one end on the inner ring 87 side connected to the inner ring 87. A shaft 90 is provided.

Although not shown in the figure, the other constant velocity joint 84 has a substantially cylindrical outer ring 86 connected to the axle 39 on the axis 38 of the axle 39, and an outer ring 86. An inner ring 87 which is fitted in the inner ring 87; a ball 88 which is fitted so as to straddle the inner ring 87 and each engagement groove formed in the inner ring 87, and rotates the outer ring 86 together with the inner ring 87 around the axis 38; A cage 89 for holding a ball 88 at a predetermined position between the outer race 86 and the inner race 87;
And a drive shaft 91 indicated by a reference numeral in the drawing, which extends inward in the width direction of the vehicle body 2 on the inner side of the vehicle body center 12 and has one end on the inner ring 87 side connected to the inner ring 87.

The drive shafts 90 and 91 are located on a common axis 92 and are integrally formed with each other.
Numerals 0 and 91 link the output shaft 75 of the speed reducer 46 and the wheels 6 to each other via the outer ring 86, the inner ring 87, the axle 39, and the like.

In the above case, the intersection angle θ between the axis 72 of the output shaft 75 (outer ring 86) and the axis 92 of the drive shafts 90 and 91 is formed.
Varies with the operation of the suspension 5. The left and right outer races 86 of the left and right constant velocity joint 83 are integrally formed on the shaft center 72, and have a substantially cylindrical shape as a whole. The left and right outer rings 86, 86
And a disk-shaped partition wall 95 integrally formed with the outer ring 86 is provided. Further, each of the inner spaces 94 has an outer ring 8.
6. The inner ring 87, the ball 88, and the cage 89 are filled with grease for mutual lubrication. In this case, the opening between the outer end of each of the outer races 86 and the drive shaft 90 penetrating therethrough is closed by an elastic rubber boot (not shown). Grease leakage is prevented.

In FIG. 5 to FIG.
Is housed inside the casing 71 of the speed reducer 46 and is rotatably supported by the casing 71. The operating shaft 97 is engaged with the operating shaft 97 by cam and engaged with the gear set 77. An engagement member 98 and a rotating arm 9 protruding from the operation shaft 97 outside the casing 71.
9, one end of which is disposed near the handle 10 and can be operated by a rider, and the other end of which is
Interlocking cable 100 which is an operation means main body connected to
And

When the engaging element 98 is engaged with a part of the gear set 77 via the interlocking cable 100, the rotating arm 99 and the operating shaft 97 by the rider's operation (arrow A in FIG. 6). ), The driving force input from the internal combustion engine 43 to the input shaft 73 of the speed reducer 46 via the chain winding means 47 causes the intermediate shaft 74, the output shaft 75, the gear set 77, Each constant velocity joint 83, 8
4, and transmitted to each wheel 6 via each axle 39,
Each of these wheels 6 is rotated forward.

On the other hand, when the engaging element 98 is engaged with the other part of the gear set 77 via the interlocking cable 100 or the like by the rider (arrow B in FIG. 6), the internal combustion engine 43 The power input to the input shaft 73 of the speed reducer 46 through the chain wrapping means 47 is applied to the reverse shaft 76, the intermediate shaft 74, the output shaft 75, the gear set 77, The power is transmitted to the wheels 6 via the joints 83 and 84 and the axles 39, and the wheels 6 are reversed.

The support means 45 will be described in all figures.

The support means 45 supports the speed reducer 46 on the vehicle body frame 3 as described above.
The chain winding means 47 also serves as a take-up device for bringing the chain 81 into a desired tension state.

The axis 102 of the driven sheave 80 in the chain winding means 47 is connected to the input shaft 73 of the speed reducer 46.
And is located above the axis 38 of the rear wheel 6. The front lower end of the casing 71 of the reduction gear 46 is pivotally supported by the lower frame 27 of the vehicle body frame 3 by a pivotal support 103 whose axis extends in the width direction of the vehicle body 2. The upper part of the casing 71 is swingable back and forth (arrow C in FIG. 4). The driven wheel 80 is supported on the upper end of the casing 71 of the speed reducer 46, which is the swinging end, and the driven wheel 80 swings back and forth around the pivot support 103 together with the upper part of the casing 71. It is free to move.

The support means 45 includes the casing 71
A fixing means 105 for fixing the casing 71 to the horizontal coupling frame 29 of the vehicle body frame 3 at an arbitrary swinging position on the upper side of the casing 71 is provided. The fixing means 105 is connected to the horizontal coupling frame 29 of the vehicle body frame 3 at one end in front of the casing 71 of the reduction gear 46 by pivotal support, and the other end is a rotating end of the casing 71. The fixing means 105 is configured to be freely expandable and contractible in its longitudinal direction by a twisting operation from the outside with respect to the rod. Further, the fixing means 105 is disposed to extend in the front-rear direction.

If the fixing means 105 is contracted (FIG. 4)
The upper part of the casing 71 is a driven chain wheel 8
When the fixing means 105 is extended (solid line in FIG. 4), the upper portion of the casing 71 is swung rearward together with the driven wheel wheel 80. The chain 81 is pulled more strongly.

The fixing means 105 is connected to the vehicle center 12.
Is provided on one side (left side) of the vehicle body 2 with respect to
Therefore, the operation of the fixing means 105 from the outside of one side of the vehicle body 2 can be easily performed.

The above-described drive sheave 79 and driven sheave 8
0 and the chain 81 are also offset from the one side of the vehicle body 2. In this case, when the vehicle body 2 is viewed from the side (FIG. 4), almost the entirety of the fixing means 105 is a drive chain. It is arranged in the internal space of the wheel 79, the driven wheel 80, and the chain 81 wound around them. Therefore, the operation of the fixing means 105 can be smoothly performed without being disturbed by the chain 81 or the like.

Referring to FIGS.
Is provided with another fixing means 107. This fixing means 10
7 are support pieces 108, 108 projecting from the left and right vertical connecting frames 28, 28 constituting the rearmost end of the body frame 3.
An elongated hole 109 formed in each of the support pieces 108 so as to extend around the pivot support 103;
And a fastener 110 that penetrates through the upper end of the casing 71 and each of the long holes 109 and detachably fastens the casing 71 to the vehicle body frame 3 at an arbitrary swing position of the casing 71.

The speed reducer 46 is firmly supported on the vehicle body frame 3 by the pivot support 103 and the fixing means 105 and 107.

In FIG. 6, the traveling braking device 22 comprises:
Another side (right side) of the casing 71 of the reduction gear 46
A brake disk 113 attached to the other end of the input shaft 73, which is a power transmission system interlocked with the rear wheel 6, and frictionally connected to the brake disk 113 supported by the vehicle body frame 3. And a hydraulic caliper 114 that is enabled. The rotating arm 99 and the brake disk are provided in the width direction of the vehicle body 2 on the side opposite to the driven chain wheel 80 with respect to the casing 71 of the speed reducer 46. 113 and a caliper 114 are provided.

In FIGS. 5 and 6, the parking brake device 23 is used.
The brake gear 116 is provided inside the casing 71 of the speed reducer 46 and supported by the intermediate shaft 74 which is a part of the power transmission system of the speed reducer 46, and is provided inside the casing 71. The lock arm 117 includes a lock arm 117 swingably supported by the lever arm 117 and a spring 118 for urging the swing end of the lock arm 117 to engage the brake gear 116. The other swinging end is engaged with the operation shaft 97.

When the switching operation means 21 is operated during traveling, such as when the vehicle 1 is moving forward or backward, the lock arm 117 is engaged with the operation shaft 97 by the engagement of the lock arm 117 from the brake gear 116 to the spring 118. The power transmission in the speed reducer 46 is allowed.

If parking brake is selected by operating the switching operation means 21 when the vehicle 1 is parked, the lock arm 117 is disengaged from the operation shaft 97, and the lock is activated by the biasing force of the spring 118. The arm 117 is engaged with the brake gear 116, and thus the speed reduction device 4
The wheel 6 is braked by inhibiting the power transmission in the vehicle 6, and the vehicle 1 is kept in a parked state.

According to the above configuration, the carburetor 57 is disposed above the cylinder 55, and the air cleaner 58 is disposed above the projecting end of the cylinder 55 and in front of the carburetor 57. The fuel tank 59 is disposed above the crankcase 54 and behind the carburetor 57.

For this reason, the air and fuel sucked into the cylinder 55 through the carburetor 57 are downdraft, and the responsiveness of the internal combustion engine main body 53 is improved.

In the case described above, the cylinder 5
The air cleaner 58 is disposed in a space 60 formed in front of the carburetor 57 above the protruding end of the fuel tank 5, while the fuel tank 58 is provided in a space 61 formed in the rear of the carburetor 57 above the crankcase 54. 59 are provided.

As a result, unnecessary excess spaces 60 and 61 are prevented from being generated, and the internal combustion engine main body 53, the carburetor 57, and the air cleaner 5, which are components of the drive device 20, are prevented.
8 and the fuel tank 59 are arranged compactly with respect to each other.

Therefore, it is advantageous that the outer shape of the vehicle 1 is prevented from being excessively large, and a desired saddle riding posture with respect to the vehicle 1 is secured.

Further, as described above, the crankcase 5
Since the fuel tank 59 is disposed above the carburetor 57 above the carburetor 57, the fuel tanks 54, 57, 59 are compactly arranged with each other. Mass concentration in the drive 20 is achieved.

Therefore, the maneuverability of the vehicle 1 is improved.

As described above, the upper surface of the middle portion 62 in the front-rear direction of the seat 11 is used as a rider's seating surface, and the upper surface of the front end portion 63 of the seat 11 is an inclined surface that rises forward from the middle portion 62 side. In this case, at least a part of each of the carburetor 57, the air cleaner 58, and the fuel tank 59 is housed inside the front end 63 of the seat 11.

For this reason, in the above-mentioned structure of the seat 11 particularly employed in the off-road vehicle 1, the inside of the front end 63 of the seat 11 is effectively used, and the components of the driving device 20 are used. A certain vaporizer 57 and the like will be provided.

Therefore, also in this respect, the components of the drive device 20 are compactly arranged, and the external shape of the vehicle 1 is prevented from being excessively large.

In the above case, the internal combustion engine main body 53 of the internal combustion engine 43, the power transmission device 44, the reduction gear 46, the extension end side of the exhaust pipe main body 65, and the muffler 66
Is disposed substantially on the center 12 of the vehicle body in plan view,
The right and left weight balance of the vehicle 1 is made substantially equal.

For this reason, the vehicle 1 is supported on the running surface 7 by the left and right independent suspensions 5 and 5, and the right and left balance tends to be unstable. Is prevented, and the riding comfort of the vehicle 1 is improved.

[0074]

The effects of the present invention are as follows.

According to the first aspect of the present invention, a pair of left and right front and rear wheels are suspended from the vehicle body frame, and a seat on which a rider can sit in a saddle-riding manner is supported on the upper surface of the vehicle body frame. An internal combustion engine main body is supported on the body frame below the front end, and the internal combustion engine main body includes a crankcase and a cylinder protruding forward and upward from the crankcase. The cylinder includes a carburetor and an air cleaner. In a straddle-type vehicle connected in this order, and provided with a fuel tank for storing fuel supplied to a cylinder through the carburetor,

A carburetor is provided above the cylinder, and the air cleaner is provided above the projecting end of the cylinder and in front of the carburetor, while the carburetor is provided above the crankcase. The fuel tank is disposed at the rear.

For this reason, the air and fuel sucked into the cylinder through the carburetor are downdraft, and the responsiveness of the internal combustion engine body is improved.

In the case described above, the air cleaner is disposed in a space formed in front of the carburetor above the protruding end of the cylinder, and on the other hand, in a space above the crankcase and behind the carburetor. The fuel tank is disposed in the space where the fuel tank is formed.

Therefore, the generation of unnecessary extra space is prevented, and the internal combustion engine main body, the carburetor, the air cleaner, and the fuel tank, which are the components of the driving device, are compactly arranged.

Therefore, it is advantageous that the outer shape of the vehicle is prevented from being excessively large, and a desired saddle riding posture with respect to the vehicle is ensured.

Further, as described above, since the fuel tank is disposed above the crankcase and behind the carburetor,
They are arranged compactly with respect to each other, and because they are all heavy, a mass concentration in the drive is achieved.

Accordingly, the maneuverability of the vehicle is improved.

According to a second aspect of the present invention, the upper surface of the middle portion of the seat in the front-rear direction is a seating surface for the rider, and the upper surface of the front end portion of the seat is an inclined surface rising forward from the middle portion. Type vehicle,

At least a part of the vaporizer is housed inside the front end of the sheet.

For this reason, in the above-described seat structure particularly used in off-road vehicles, the inside of the front end of the seat is effectively used, and the carburetor, which is a component of the drive device, is provided. Will be established.

Therefore, also in this respect, the components of the drive unit are compactly disposed, and therefore, the external shape of the vehicle is prevented from being excessively large.

[Brief description of the drawings]

FIG. 1 is an overall side view of a vehicle.

FIG. 2 is an overall plan view of the vehicle.

FIG. 3 is a partial rear view of the vehicle.

FIG. 4 is a partially enlarged view of FIG. 1;

FIG. 5 is a partially enlarged partial sectional view of FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 5;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 5;

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Body 3 Body frame 4 Wheel 5 Suspension 6 Wheel 11 Seat 20 Drive device 53 Internal combustion engine main body 54 Crankcase 55 Cylinder 57 Vaporizer 58 Air cleaner 59 Fuel tank 60, 61 Space 62 Midway 63 Front end

Claims (2)

[Claims] 1. A pair of left and right front parts are provided on a body frame,
A rear wheel is suspended, and a seat on which a rider can sit in a saddle-riding manner is supported on the upper surface side of the vehicle body frame, and an internal combustion engine body is supported by the vehicle body frame below a front end of the seat. The main body includes a crankcase and a cylinder protruding forward and upward from the crankcase, a carburetor and an air cleaner are connected to the cylinder in this order, and fuel supplied to the cylinder through the carburetor is provided. In a saddle-ride type vehicle provided with a fuel tank for storing a fuel tank, a carburetor is disposed above the cylinder, and the air cleaner is disposed in front of the carburetor above a protruding end of the cylinder, A component mounting structure of a drive device in a saddle-ride type vehicle in which the fuel tank is disposed above the crankcase and behind the carburetor. 2. A saddle-ride type vehicle in which an upper surface of a middle portion of the seat in the front-rear direction is a seating surface of a rider, and an upper surface of a front end portion of the seat is an inclined surface which rises forward from the middle portion side. 2. The structure of claim 1, wherein at least a part of the carburetor is accommodated in a front end portion of the seat.