JPH0774016B2 - Saddle-type four-wheeled vehicle for running on rough terrain - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an advantage that the front cover is less likely to be damaged by contact with an obstacle when traveling on rough terrain and can increase the mudguard function when traveling on a wetland or a mudland. The present invention relates to a saddle riding type four-wheeled vehicle for leveling.

[0002]

2. Description of the Related Art Vehicles used for running on rough terrain are
When the driver rides on the tower, the balance is easy and the maneuverability is required. Therefore, conventionally, a three-wheeled vehicle, which is an improved two-wheeled vehicle, has been widely used. However, structurally, the frame of the two-wheeled vehicle is provided with two rear wheels, which is within the range of the two-wheeled vehicle. Therefore, we have developed the prior art in which a steering shaft of a three-wheeled vehicle is provided with two front wheels to make it a four-wheeled vehicle.
No. 73694). In the four-wheeled vehicle described in this prior art, forks having a bifurcated lower end portion of a shaft are used to support the front wheels, and the front wheels are provided outside the branched forks, respectively. Moreover, tires having the same diameter as the rear wheels are mounted on the front wheels, and the front fenders and the rear fenders that cover the upper portions of these tires are integrally formed with the cover part that covers the center of the frame. Therefore,
Even though the front wheels are two wheels in the prior art, since they were directly connected to the forks, they had only the same function as one wheel,
In particular, since two tires having the same diameter as the rear wheel side are mounted, the handle becomes extremely heavy, which deteriorates the steering performance. As a related related prior art, JP-A-55-10
2714, Japanese Utility Model Publication No. 55-138123, and Design Registration No. 538800.

[0003]

In such an all-terrain vehicle, a four-wheeled vehicle equipped with balloon tires on front and rear wheels is operated by steering a bar handle on an uneven ground such as snow, mud terrain or forest road. Since it is driven by a car, it requires a light steering force that cannot be overwhelmed. Further, it is necessary to prevent the obstacle from coming into contact with the leg on the step during traveling and increase the chances that the side surface of the front wheel comes into contact with the stone or the tree, so that the damage to the vehicle body component (front fender) must be prevented. In particular, this type of rough terrain vehicle does not run at high speed, so it is necessary to use nerves for overheating, so engine cooling efficiency must be taken into consideration.

The present invention solves the above-mentioned problems, the front cover is less likely to be damaged by contact with an obstacle when traveling on rough terrain, and the mudguard function can be increased when traveling on a wetland or a mudland. An object of the present invention is to provide a saddle-ride type four-wheeled vehicle for traveling on rough terrain.

[0005]

In order to solve the above-mentioned problems, the present invention comprises front and rear wheels and two front and rear wheels equipped with balloon tires on each of the front left and right sides and the rear left and right sides of the frame, and the steering shaft with respect to the frame. A front wheel side in which a vertically long seat is placed approximately in the center of the frame from the rear part of the shaft support portion that rotatably supports the frame and the bar handle provided on the upper end of the steering shaft links the lower end of the steering shaft. The front two wheels are steered via the knuckle arm, and the steps are arranged between the front and rear wheels on the left and right of the frame below the seat, and the engine mounted on the frame between the front and rear wheels drives the wheels to drive on rough terrain. A straddle-type four-wheel vehicle, in which the tire width W ₁ of the front wheels is set smaller than the tire width W of the rear wheels (W ₁ <W),
The outer edge width l ₁ of the left and right steps is arranged inside the front wheel width l ₂ (l ₁ <l ₂ ), and the left and right fenders that cover the upper portions of the left and right front wheels and the frame center between these fenders are arranged. A center fender that covers the upper part, a front wall that covers the front part of the steering shaft upper part from the rear of the center fender and diagonally rises backward, and an upper part inside the left and right fenders so as to cover the steering shaft upper part laterally. A front cover device is provided that includes a front side wall that faces the front side wall, and a rear side wall that extends rearward of the front side wall and that has at least a lower edge that is located above the crankcase of the engine in a substantially vertical direction. Provide the outer edge inside the left and right balloon tires,
It is to provide a soft auxiliary fender projecting to the outside of the left and right fenders from at least the rear end part to the outer part.

[0006]

The front cover device for a saddle-ride type four-wheeled vehicle for traveling on uneven terrain according to the present invention straddles the seat and puts a foot on the step,
Grab the bar handle and get on the tower. The riding posture is similar to that of a motorcycle. Then, the engine is operated to start traveling. Balloon tires are low-pressure and wide tires, so when they come into contact with stones or other obstacles or ride on them, they deform freely and absorb some impact. Since the outer edge width l ₁ of the left and right steps is arranged inside the front wheel width l ₂ (l ₁ <l ₂ ), obstacles do not contact the legs during traveling. When the bar handle is operated during a curve, the left and right front wheels are steered from the steering shaft via the link mechanism and the arm. At this time, the driver stiffens his / her feet in steps to assist in steering in a curve by moving the weight. The tire width W ₁ of the front wheels is set smaller than the tire width W of the rear wheels (W
_{Since 1} <W), steering is easy. Left and right fenders that cover the upper left and right front wheels, a center fender that covers the upper center of the frame between these fenders, and a diagonally rearward rise from the rear of this center fender,
A front wall that covers the front of the upper portion of the steering shaft, a front side wall that extends upward to cover the sides of the upper portion of the steering shaft inside the left and right fenders, and at least a lower edge that extends rearward of the front side wall is a crank of the engine. Since the front cover device is configured to include the substantially vertical rear wall located above the case, the side of the engine can be opened, so that the cooling efficiency is improved. Since the front cover devices are detachably fixed to the front portions of the frame so that the front edges of the left and right fenders and the center fender are located rearward of the front edges of the left and right front wheel balloon tires, the front edges of the left and right fenders and the center fender are Less risk of contact with obstacles. Since the front fender is equipped with an auxiliary fender made of a soft material such as rubber or vinyl chloride, the mudguard function can be increased when traveling in a wetland or a mudland.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing an embodiment of a front cover device for a saddle-ride type four-wheeled vehicle for traveling on rough terrain, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a perspective view showing the frame structure of FIG. FIG. 4 is a plan view showing the cover and sheet of FIG.

1 and 2, reference numeral 1 denotes a saddle-riding type body, which is a front wheel 3 and a rear wheel on the front left and right and the rear left and right of a frame 2 configured as shown in FIG. 4 are provided for each two wheels, and the front wheel 3 and the rear wheel 4 are
A tire having a low internal pressure and a wide contact surface with the ground, a so-called balloon tire 5, is provided. A link mechanism 6 as shown in FIG. 4 is used as the steering mechanism for steering the front wheels 3, and a bar handle 7 having grips 701 at both ends is used as a handle for operating the link mechanism 6.

The structure of the frame 2 will be described with reference to FIG. The frame 2 includes a pair of upper frames 8
₁ , 8 ₂ and lower frames 9 ₁ , 9 ₂ and between these upper frames 8 ₁ , 8 ₂ and lower frame 9 ₁ ,
9 ₂ and a plurality of spacer frames 10 for keeping a predetermined space therebetween. Above upper frame 8 ₁ , 8
₂ , a front end portion 801 is bent forward and obliquely downward, and a rear end portion of the rear portion of the inclined portion 803 is formed by forming a slant portion 803 that is inclined downward at a gentle angle behind the bent portion 802. 804 is bent horizontally or slightly upward. The front ends of the upper frames 8 ₁ and 8 ₂ are the front wheels 3
A U-shaped fixing frame 13 for fixing the front cover 12 with a screw is mounted between the front end portions 801 and the axle 11 that supports the front cover 12. The bent portions 802 of the upper frames 8 ₁ and 8 ₂ are provided with a steering shaft support portion 15 that supports the steering shaft 14 of the bar handle 7.

On the other hand, the lower frames 9 ₁ and 9 ₂ have their front ends connected to the axle 11, and the rear end portions 901 are bent to stand up, and the rear end portions 804 of the upper frames 8 ₁ and 8 ₂ are raised. Are connected to each. A bar step 16 for a driver is mounted in the middle of the lower frames 9 ₁ , 9 ₂ . The width l ₁ between the outer edges of the bar step 16 is set so that l ₁ <l ₂ with respect to the width l ₂ between the left and right front wheels 3, 3 and the front wheel 3, 3 is closed. The width l ₂ is set such that l ₂ <l ₃ with respect to the width l ₃ between the rear wheels 4 and 4.

The diameter d ₁ of the front wheels 3, 3 and the tire width W ₁ are d with respect to the diameter D and the tire width W of the rear wheels 4, 4.
_By setting ₁ <D, W ₁ <W, the front wheels 3 and 3 are easily steered. Bent portions 902 of the lower frames 9 ₁ and 9 ₂
A support portion 903 that supports the drive shaft 17 of the rear wheel 4 is provided in the. An engine 18 including a cylinder portion 18a and a crankcase portion 18b, a fuel tank 19 and the like are mounted in a space portion A formed by the upper frames 8 ₁ and 8 ₂ and the lower frames 9 ₁ and 9 _2. .

Next, a steering mechanism for steering the front wheels 3 will be described with reference to FIG. The front wheels 3 are U-shaped frames 2 attached to both ends of the axle 11 as shown in FIGS. 5 and 6.
No. 0 is mounted so that it can be steered, and this mounting structure is performed by pivotally supporting a support pipe 22a integrally provided on a wheel support shaft 22 on a frame 20 by a king pin 21. A spacer 221 and a bush 22 are provided between the support pipe 22 a and the kingpin 21.
2 is loosely fitted. As shown in FIGS. 7 and 8, the steering shaft 14 is bolted through a resin spacer 151 to a rotatably supported upper end, and the lower end of the steering shaft 14 is supported by the axle 1 as shown in FIGS.
It is rotatably supported by a support portion 23 provided at an intermediate position of 1. An arm 24 is attached to a lower end portion of the steering shaft 14, and one end portions of left and right tie rods 25 are rotatably supported by the arm 24 via a pin 26. The other end of the tie rod 25 is rotatably supported by a knuckle arm 28 mounted on the wheel support shaft 22 by a pin 27. by this,
The steering shaft 14 and the front wheels 3 are linked by a link mechanism 6
And the front wheels 3 are steered by operating the bar handle 7. On the other hand, the rear wheel 4 is connected to the engine 1
8 is supported by a drive shaft 17 which transmits power from a power transmission mechanism 8 via a power transmission mechanism (not shown).

Next, returning to FIGS. 1 and 2, the body 1 will be described.
The cover disposed as the exterior of the vehicle is divided into two parts, that is, the front cover 12 and a rear cover 29 combined with the front cover 12, and the front cover 12 and the rear cover 29 are disposed on the left and right, respectively.
21 and the rear fender 291 are integrally formed.
The front cover 12 includes a front fender 121 that covers the upper portions of the left and right front wheels 3, and these front fenders 121.
The center fender 122 that connects the two to each other, the front wall 123a that rises from the rear of the center fender 122 in a diagonally rearward direction and covers the upper front of the steering shaft 14, and the steering inside the left and right front fenders 121. Front side wall 123 covering the upper side of the shaft 14
b, and a rear side wall 124 extending rearward from the cylinder 18a of the engine 18 and having at least a lower edge 124a positioned above the crankcase portion 18b in a substantially vertical direction behind the front side wall 123b. It constitutes the front cover device. A projecting piece 33 having a screw hole 32 is provided at the rear edge of the rear side wall 124. The projecting piece 33 is screwed and attached to the projecting piece 34 provided with the screw hole 34a provided in the inclined portion 803 of the upper frames 8 ₁ and 8 ₂ . The front wall 123a
And the front side walls 123b on the left and right sides have a substantially truncated pyramid-shaped top portion 12
3 is formed, and the steering shaft 14 is disposed so as to project through the top portion 123 having a substantially truncated pyramid shape.

The left and right front fenders 121 have outer edges 121a located inside the balloon tire 5 of the front wheel 3, and front fenders 121 and center fenders 122 have front edges located rearward of the front edge of the balloon tire 5. Thus, it is detachably fixed to the frame 2. The front fender 121 is formed in a taper that gradually becomes thinner from the outermost portion O of the outer edge 121a toward the front portion f, and has an action of scraping grass and the like when running in a bamboo bush or a forest. The center fender 12
2 has a top surface formed in a recess with respect to the front fender 121, and the front edge of the center fender 122 is located behind and below the front edge of the front fender 121. The front wall 123a is provided with an air inlet 30 for taking in cooling air for cooling the cylinder 18a of the engine 18 and the like, and a screw hole 31 for attaching the front cover 12.

The upper surface of the rear cover 29 is opened to form an opening 292, and the engine 18 and the fuel tank 19 are arranged below the opening 292. The rear cover 29 is screwed to the upper frames 8 ₁ and 8 ₂ at several places, and the seat 35 is placed on the upper portion of the rear cover 29. On the other hand, the body 1 is attached to the axle 11.
Is mounted with a bumper 36 for protecting the front surface of the main pipe 37. The bumper 36 includes a main pipe 37 bent in an inverted U shape, and a plurality of auxiliary pipes laid across opposite portions of the main pipe 37. And 38. The main pipe 37 can also be used as a lifting handle when lifting the vehicle body. If the protection plate 39 is attached to the lower side of the bumper 36, the engine portion can be further protected.

The front fender 121 and the rear fender 291 are arranged so as to be located inside the outer side 5a of the balloon tire 5, and prevent contact with rocks or obstacles. The front fender 121 and the rear fender 291 have auxiliary fenders (flaps) 40 and 41 formed of a soft material such as rubber or vinyl chloride that extends outward from at least the rear end portion.
Is provided. The auxiliary fenders 40 and 41 are provided so as to project outward from the front fender 121 and the rear fender 291. However, since they are made of a soft material, they are freely bent, so that they will not be damaged even if they come into contact with an obstacle. . When the front fender 121 and the rear fender 291 are equipped with so-called over fenders or auxiliary fenders formed of a soft material such as strip-shaped rubber or vinyl chloride on the entire outer side or the front side, when traveling in a wetland or a muddy area It goes without saying that the mudguard function can be increased. In this case, the over fender or the auxiliary fender is detachably attached to the front fender 121 and the rear fender 291 by using a clip or the like, and the over fender or the auxiliary fender is removed when traveling in a bamboo bush or a forest to prevent damage due to the bamboo bush or the like. be able to.

Next, a case where the saddle-ride type four-wheeled vehicle for traveling on uneven terrain according to the present invention is driven will be described. First, the driver straddles the seat 35, places his foot on the bar step 16, grips the grip 701 of the bar handle 7 in both hands, and runs. Then, in order to make a left turn, a right turn, a turn, etc., the bar handle 7 is rotated in a desired traveling direction like an ordinary motorcycle. In response to this, the steering shaft 14 rotates by a predetermined angle, and the link mechanism 6 operates in accordance with the rotation of the arm 24. As a result, the front wheel 3 having a smaller diameter and a smaller width than the rear wheel 4 can be easily steered by a necessary angle and the traveling direction of the vehicle body can be changed despite the balloon tire having a larger ground contact area than the normal tire. . When making a sharp turn or the like, when the direction of the bar handle 7 is changed and the weight is moved at the same time, the balloon tire 5 on the inner wheel side is dented, which has a function similar to that of a differential gear of a normal four-wheel vehicle. As a result, a sharp turn is made.

Since the balloon tire 5 of the front wheel 3 is mainly used for traveling on uneven terrain, it travels while riding on or in contact with obstacles such as rocks, stones and trees. At this time, since the outer edge 121a of the front fender 121 is located inside the balloon tire outer side 5a, the outer edge 121a of the front fender 121 is less likely to come into contact with or be damaged by an obstacle. Since the auxiliary fenders (flaps) 40 and 41 freely bend, they will not be damaged even if they come into contact with an obstacle. In particular, the outer edge 121a of the front fender 121 is formed to have a taper that gradually becomes thinner from the outermost portion O toward the front portion f, so that a standing tree is scraped off when traveling in a yab such as a road. To work. Obstacles such as stones that collide with the front surface of the body 1 during traveling are protected by the bumper 36. The bumper 36 can be used as a handle for lifting the body 1 when changing the direction of the body 1. The effects of the embodiment are as follows. When the left and right front fenders cover the left and right front wheel balloon tires and the outer edges are located inside the front wheel balloon tires, the rocks or the There is little chance that the front fender will be damaged due to contact with obstacles such as trees. Further, since the front cover devices are detachably fixed to the front portions of the frames so that the front edges of the left and right fenders and the center fender are located rearward of the front edges of the left and right front wheel balloon tires, rocks, standing trees, etc., may be prevented during running. It does not damage the front cover device by touching the front edge of the front cover.

[0019]

As described above, the saddle riding type four-wheeled vehicle for traveling on rough terrain according to the present invention has the following effects by providing each constituent element in a single vehicle. Since the tire width W ₁ of the front wheels is set smaller than the tire width W of the rear wheels,
Compared with the front wheel having the same width as the rear wheel, the ground contact area of the front wheel is reduced, and the steering force of the steering wheel can be reduced to improve the steering performance. Further, the outer edge width l ₁ of the left and right steps is arranged inside the width l _{2 of the} front wheel (l ₁ <
Since l ₂₎ was, before the wheels is grass, they are after traveling by trampling the tree or the like is never hits the foot (step).
Further, the left and right fenders that cover the upper parts of the left and right front wheels, the center fender that covers the upper center part of the frame between these fenders, and the front part of the center fender that rises diagonally rearward and covers the upper front part of the steering shaft. A wall, and a front side wall that extends upward so as to cover the upper side of the steering shaft inside the left and right fenders,
Since the front cover device having at least the lower edge extending rearward of the front side wall and the rear side wall in the substantially vertical direction located above the crankcase of the engine is provided, the side surface of the crankcase of the engine is opened to the outside. Therefore, the cooling efficiency of the engine is improved.
In particular, the vehicle that runs on rough terrain is not a vehicle that runs at high speed, so we use our nerves to overheat and take into consideration the efficient cooling effect. Since the outer edges of the left and right fenders are provided inside the outer sides of the left and right balloon tires, and the soft auxiliary fenders that extend to the outside of the fenders from at least the rear end portion to the outer side of the left and right fenders are provided, obstacles are provided. On the other hand, the flexible auxiliary fender portion can be freely deformed to prevent damage to the fender body portion, and the auxiliary fender can increase the mudguard function when traveling in a wetland or a mudland.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a saddle-ride type four-wheeled vehicle for traveling on rough terrain according to the present invention.

FIG. 2 is a plan view of FIG.

3 is an exploded perspective view showing the cover and frame structure of FIG. 1. FIG.

FIG. 4 is a plan view showing a cover and a sheet of FIG. 2 removed.

FIG. 5 is a cross-sectional view showing a connecting portion between an axle and a front wheel.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a partial cross-sectional view showing a support structure of a steering shaft.

8 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Body 2 Frame 3 Front Wheel 4 Rear Wheel 5 Balloon Tire 6 Link Mechanism 7 Bar Handle 11 Axle 12 Front Cover 14 Steering Shaft 16 Step 24 Arm 40 Auxiliary Fender 41 Auxiliary Fender 121 Front Fender 122 Center Fender 291 Rear Fender

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiki Shinohara 1299-54 Tomitsuka-cho, Hamamatsu City, Shizuoka Prefecture

Claims (1)

[Claims] 1. A front wheel and a rear wheel of a frame are provided with two front wheels and two rear wheels on which balloon tires are mounted, respectively, and a rear portion of a shaft supporting portion rotatably supporting a steering shaft with respect to the frame, and a rear portion of the frame. A vertically oriented seat is placed approximately in the center of the frame, and the front two wheels are steered through a knuckle arm on the front wheel side linked to the lower end of the steering shaft by a bar handle provided on the upper end of the steering shaft. Is a saddle-type four-wheel vehicle in which front and rear wheels are arranged on the left and right of the frame below the seat, and wheels are driven by an engine mounted on the frame between the front and rear wheels to drive on rough terrain. Tire width W
₁ is set to be smaller than the tire width W of the rear wheels (W ₁ <W), and the outer edge width l ₁ of the above left and right steps is set to the width l of the front wheels.
_It is arranged inside ₂ (l ₁ <l ₂ ), the left and right fenders covering the upper parts of the left and right front wheels, the center fender covering the central upper part of the frame between these fenders, and diagonally rearward from the rear of the center fender. A front wall that is raised toward the front of the steering shaft to cover the front of the steering shaft, a front side wall that extends upward to cover the sides of the steering shaft above the left and right fenders, and at least a lower edge that extends rearward of the front wall. Is a front cover device each having a substantially vertical rear side wall located above the crankcase of the engine, and the outer edges of the left and right fenders are provided inside the outer sides of the left and right balloon tires. It is characterized in that a soft auxiliary fender is provided which extends over at least the rear end portion of the fender and the outer portion of the fender. A straddle-type four-wheeled vehicle for running on rough terrain.