JPH0667746B2 - Front cover device for saddle riding type four-wheeled vehicle for running on rough terrain - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention aims to improve the cooling efficiency of an engine, reduces the risk of the front cover device coming into contact with an obstacle and being damaged during traveling on an uneven terrain, and at the time of traveling. The present invention relates to a front cover device for a saddle riding type four-wheeled vehicle for traveling on rough terrain in which legs do not come into contact with an obstacle.

b. Conventional technology Vehicles used for running on rough terrain are required to have good balance and easy maneuverability when the driver rides on a tower. 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 a prior art technology in which two front wheels are provided on the steering shaft of a three-wheeled vehicle to make a four-wheeled vehicle.
-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, a tire having the same diameter as that of the rear wheel is attached to each of the front wheels, and a front fender portion that covers the upper portion of the tire is formed integrally with a cover portion that covers the center portion of the frame.

Therefore, even if the front wheels are two wheels in the prior art, since they are directly connected to the forks, they have only the same function as one wheel. In particular, since the two wheels with the same diameter as the rear wheels are mounted, the handlebar is It became extremely heavy, and the steering performance was deteriorated.

Similar related prior arts include JP-A-55-102714, JP-B-55-138123, and Design Registration No. 538800.

c. Problems to be Solved by the Invention In such an all-terrain vehicle, a four-wheeled vehicle with steered bar handles on snow, mud terrain, forest roads, etc. and balloon tires on the front and rear wheels Since it is driven by a car, it requires a light steering force that cannot be overwhelmed. Also, it is necessary to prevent obstacles from coming into contact with the legs on the step during traveling, and increase the chances that the side surfaces of the front wheels come into contact with stones or trees, so that damage to vehicle body parts (front fenders) 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 problems, improves the cooling efficiency of the engine, reduces the risk of the front cover device contacting and damaging an obstacle during traveling on uneven terrain, and the legs contact the obstacle during traveling. An object of the present invention is to provide a front cover device for a saddle-ride type four-wheeled vehicle for traveling on rough terrain that does not occur.

d. Means for Solving the Problems In order to solve the above problems, the present invention includes front and rear left and right rear parts of a frame, two front wheels and two rear wheels each having balloon tires, and a 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. Steering the front two wheels via the knuckle arm of the car, and arranging the bar steps between the front and rear wheels on the left and right of the frame below the seat, and driving the wheels with the engine mounted on the frame between the front and rear wheels to drive on rough terrain. It is a saddle type four-wheeled vehicle,
The tire width W ₁ of the front wheel is set smaller than the tire width W of the rear wheel (W ₁ <W), and the outer edge width l ₁ of the left and right bar steps is arranged inside the width l _{2 of the} front wheel ( l ₁ <
l ₂ ), and integrally molding an upper wall that covers above the left and right front wheel balloon tires and a rear wall that covers the rear of the tires, and
The left and right front fenders whose outer edges are located inside the outside of the front wheel balloon tires, the center fenders that cover the upper center of the frame between these left and right front fenders, and the diagonally rearward rises from the center fenders. A front cover that covers the front of the steering shaft, a top cover that is inside the left and right front fenders, and a side wall that extends upward so as to cover the left and right sides of the steering shaft, and an inner edge of the front fender. And a side cover part in a substantially vertical direction, respectively, to form a front cover device, and the cylinder part of the engine is seen from the side of the vehicle. The front part is behind the rear wall of the front fender part and Is located below the side cover, and at least the engine The front side of the front cover device is mounted on the frame with the sides of the front and rear fenders and the center fender being positioned behind the front edges of the left and right front wheel balloon tires. It has been fixed to the detachable.

e. Work The front cover device of the saddle-ride type four-wheeled vehicle for traveling on uneven terrain of the present invention straddles the seat, puts a foot on the step, grips the bar handle, and rides on the tower. The riding posture is similar to that of a motorcycle. Then, the engine is operated to start traveling. When a balloon tire comes into contact with an obstacle such as a stone such as a low-pressure wide tire or rides on it, it is freely deformed and absorbs 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 ),
No obstacles will come into contact with your legs when riding.

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. Since the tire width W ₁ of the front wheels is set smaller than the tire width W of the rear wheels (W ₁ <W), steering is easy.

Left and right front fenders, which are integrally formed with an upper wall that covers the left and right front wheel balloon tires and a rear wall that covers the rear of the tires, and have outer edges located inside the front wheel balloon tires The center fender portion covering the center upper part of the frame between the front fender portions, the front wall that covers the front of the steering shaft and diagonally rises from the center fender portion, and the inside of the left and right front fender portions. A front cover device is provided with a top cover portion including side walls directed upward so as to cover both left and right sides of the steering shaft, and a side cover portion extending rearward from an inner edge of the front fender portion and extending in a substantially vertical direction. Therefore, the cylinder side of the engine can be opened to the outside, which improves the cooling efficiency of the engine. To above. A front side of the cylinder portion of the engine is rearward of the rear wall of the front fender portion, a front side thereof is disposed below the side cover portion, and at least a side portion of the cylinder portion of the engine is exposed in a frame. Since it is installed in the, the heat dissipation effect of the engine is great. In particular, the vehicle that runs on rough terrain is not a vehicle that runs at high speed, so I use my nerves to overheat,
This is so that the cooling effect can be obtained efficiently.

Furthermore, since the front cover devices are detachably fixed to the frame front portions so that the front edges of the left and right front fender portions and the center fender portion are located behind the front edges of the left and right front wheel balloon tires, respectively, when traveling, Rocks or trees will not contact the front edge of the front cover and damage the front cover device.

f. Embodiment One 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 uneven terrain, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a frame of FIG. Perspective view showing the structure,
FIG. 4 is a plan view showing the cover and sheet of FIG.

In FIGS. 1 and 2, reference numeral 1 denotes a saddle-riding type body, which is a front wheel 3 and a rear wheel of a frame 2 configured as shown in FIG. Two tires 4 are provided, and a tire having a low internal pressure and a wide contact surface with the ground, a so-called balloon tire 5, is provided on each of the front wheel 3 and the rear wheel 4. The steering mechanism for steering the front wheels 3 includes a link mechanism 6 as shown in FIG.
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 and 8 ₂ and lower frames 9 ₁ and 9 ₂ and these upper frames 8 ₁ and 8 2, respectively.
Between ₂ mutually, and has a lower frame 9 _1, 9 between _two mutually is composed of a plurality of spacer frames 10 keeping a predetermined distance. The upper frame _81, 82 has a distal portion 801 forward, bent obliquely downward, the該折bent portion 802 rearward, the inclined portion 803 formed a predetermined length which is inclined downwardly in a loose angle,
A rear end portion 804 behind the inclined portion 803 is horizontally or slightly bent upward. The upper frame _81, 82, the tip is pre-coupled to the axle 11 for supporting the wheel 3, and is between the tip portion 801 cross, the front cover 12 of the U-shaped for screwing fixing The frame 13 is attached.
The upper frame _81, 82 of the bent portion 802, the steering shaft bearing 15 for supporting the steering shaft 14 of the bar handle 7 is provided.

On the other hand, the lower frames 9 ₁ and 9 ₂ are connected at their tips to the axle 11, and the rear ends 901 are bent to stand up and connected to the rear ends 804 of the upper frames 8 ₁ and 8 ₂ , respectively. Has been done.

In the middle of the lower frame 9 _1, 9 _2, bar steps 16 for a rider is attached. 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 width between the front wheels 3,3 is set. The width l ₂ is different from the width l ₃ between the rear wheels 4 and 4 by l ₂
It is set to be <l ₃ .

The diameter d ₁ of the front wheels 3, 3 and the tire width W ₁ are the rear wheels.
The diameter D and the tire width W of 4, 4 are set to d ₁ <D, W ₁ <W, so that the front wheels 3, 3 can be easily maneuvered.

The lower frame 9 _1, 9 ₂ of the bent portion 902, support portion 903 which supports the drive shaft 17 of the rear wheel 4 is provided.

These upper frames 8 ₁ and 8 ₂ and lower frames 9 ₁ and 9 ₂
In the space A formed by and, the engine 18 including the cylinder portion 18a and the crankcase portion 18b, and the fuel tank 1
9 etc. will be installed.

Next, a steering mechanism for steering the front wheels 3 will be described with reference to FIG.

The front wheels 3 are steerably attached to U-shaped frames 20 attached to both ends of the axle 11 as shown in FIGS. 5 and 6, and this attachment structure is provided by a kingpin 21.
This is performed by pivotally supporting the support pipe 22a integrally provided on the wheel support shaft 22 on the frame 20. A spacer 221 and a bush 222 are loosely fitted between the support pipe 22a and the king pin 21.

As shown in FIGS. 7 and 8, the steering shaft 14 is bolted through a resin spacer 151 to the upper end so that the steering shaft 14 can be rotatably supported, and the lower end of the steering shaft 14 is in the middle of the axle 11. Support provided in position
It is rotatably supported by 23. 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 has an arm 28 attached to the wheel support shaft 22 by a pin 27.
It is rotatably supported by. As a result, the steering shaft 14 and the front wheel 3 are connected by the link mechanism 6, and the front wheel 3 is steered by operating the bar handle 7.

On the other hand, the rear wheel 4 is supported by a drive shaft 17 that transmits power from the engine 18 via a power transmission mechanism (not shown).

Next, returning to FIG. 1 and FIG. 2, the cover provided as the exterior of the body 1 is the front cover device 12 described above.
And a rear cover device 29 combined therewith are divided into two parts, and the front cover device 12 and the rear cover device 29 respectively include a front fender portion 121 and a rear fender portion 291 on the left and right.

The front cover device 12 is a front fender portion in which a rear wall 121b that covers above the left and right front wheel balloon tires 5 and a rear wall 121c that covers the rear of the front wheel balloon tires 5 are integrally formed.
121, a center fender portion 122 that covers the center upper portion of the frame between these front fender portions 121, and a front wall 123a that covers the front upper portion of the steering shaft 14 and rises diagonally rearward from the center fender portion 122. Inside the left and right front fenders 121, the side wall 12 that extends upward so as to cover both left and right sides of the steering shaft 14.
Top cover part 123 consisting of 3b and front fender part 1
A front cover device is formed by extending rearward from the inner edge of 21 and including the side cover portions 124 in the substantially vertical direction. A screw hole 32 is formed on the rear edge of the side cover portion 124.
Is provided with a protruding piece 33. The protruding piece 33 is mounted screwed to the projecting piece 34 bored screw holes 34a provided in the upper frame _81, 82 of the inclined portion 803.

Further, the cylinder portion 18a of the engine 18 is seen from the side of the vehicle, and the front is behind the front fender portion rear wall 121c,
The upper part is arranged at a position lower than the side cover part 124, at least the side of the cylinder part 18a of the engine 18 is mounted on the frame 2 in an exposed state, and the front edges of the left and right front fender parts 121 and the center fender part 122 are arranged. The front cover device 12 is detachably fixed to the front part of the frame 2 so as to be located behind the front edges of the left and right front wheel balloon tires 5.

The left and right front fenders 121 have outer edges 121a formed inside the balloon tire 5 of the front wheel 3 and tapered such that the outer edges 121a gradually become thinner from the outermost portion O of the outer edges 121a toward the front portion f. It has the effect of scraping grass and the like when driving through bushes or forests.

The center fender portion 122 has an upper surface formed as a recess with respect to the front fender portion 121, and the front edge of the center fender portion 122 is located behind and below the front edge of the front fender portion 121.

The front wall 123a is provided with an air inlet 30 for taking in cooling air for cooling the cylinder portion 18a of the engine 18 and the like, and a screw hole 31 for mounting the front cover device 12.

Further, the rear cover device 29 has an upper surface opened to form an opening 292, and the engine 18 and the fuel tank 19 are arranged below the opening 292. This rear cover device 29
Is screwed in the upper frame _81, 82 in several locations, the sheet 35 on top of the rear cover unit 29 is placed.

On the other hand, a bumper 36 for protecting the front surface of the body 1 is mounted on the axle 11, and the bumper 36 includes a main pipe 37 bent in an inverted U shape and a facing portion of the main pipe 37. It is composed of a plurality of auxiliary pipes 38 that are bridged over. 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 portion 121 and the rear fender portion 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 portion 121 and the rear fender portion 291 are provided with at least flaps 40 and 41 formed of a soft material such as rubber or vinyl chloride that extends outward from the rear end portion to the outside. The flaps 40 and 41 are provided so as to project outward from the front fender portion 121 and the rear fender portion 291, but since they are made of a soft material, they are free to bend and will not be damaged even if they come into contact with an obstacle. Absent.

The front fender portion 121 and the rear fender portion 291
By installing a so-called over fender or auxiliary fender, which is made of a strip of rubber or a soft material such as vinyl chloride, on the entire outside or on the front side, it is possible to increase the mudguard function when traveling in a wetland or a mudland. It goes without saying that you can do it. In this case, the over fender or the auxiliary fender is detachably attached to the front fender part 121 and the rear fender part 291 by using a clip or the like, and when traveling in the bush or the forest, the over fender or the auxiliary fender is removed to remove the fender. Can prevent scratches.

Next, a case where the saddle riding type four-wheeled vehicle for traveling on uneven terrain according to the present invention is driven will be described.

First, the driver steps the seat 35 and barsteps his foot.
Place it on 16 and hold the grip 701 of the bar handle 7 in both hands to drive. 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 is operated 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 is easily steered by a necessary angle, despite the balloon tire having a larger tire contact area than the normal tire.
The traveling direction of the car body can be changed. 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 rough terrain, the balloon tire 5 rides on or comes into contact with rocks, stones, trees, etc., which are obstacles. At this time, since the outer edge 121a of the front fender portion 121 is located inside the balloon tire outer side 5a, the outer edge 121a of the front fender portion 121 is less likely to come into contact with and be damaged by an obstacle. Since the flaps 40 and 41 flex freely, they will not be damaged even if they come into contact with an obstacle.

In particular, since the outer edge 121a of the front fender portion 121 is formed in a taper that gradually becomes thinner from the outermost portion O toward the front portion f, the standing tree is scraped off when traveling in a yab such as a footpath. Act.

When traveling, obstacles such as stones that collide with the front of the body 1
Protected by bumper 36. The bumper 36 can be used as a handle for lifting the body 1 when changing the direction of the body 1.

g. Effects of the Invention As described above, the front cover device for a saddle-ride type four-wheeled vehicle for traveling on uneven terrain according to the present invention has the following effects by providing each constituent element on a single wheel.

Since the tire width W ₁ of the front wheel is set smaller than the tire width W of the rear wheel, the ground contact area of the front wheel is smaller than that of the front wheel having the same width as the rear wheel, and the steering force of the steering wheel is reduced. It is possible to improve the driving performance.

Further, the outer edge width l ₁ of the left and right steps is set to the width l _{2 of the} front wheel.
Since it is arranged more inside (l ₁ <l ₂ ), the front wheels are grass,
After trampling on trees, etc., they do not hit the feet. In addition, since 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, when traveling on a narrow rough terrain, especially on a sharp road. There is little chance that the front fender will be damaged by contact with obstacles such as rocks or trees.

An upper wall that covers the left and right front wheel balloon tires and a rear wall that covers the rear of the tires are integrally formed, and left and right front fender parts whose outer edges are located inside the outside of the front wheel balloon tires, and these left and right A center fender portion that covers the center upper part of the frame between the front fender portions, a front wall that rises diagonally rearward from the center fender portion and covers the front of the steering shaft, and the steering inside the left and right front fender portions. The front cover device is configured to include a top cover portion that includes side walls that extend upward so as to cover both left and right sides of the shaft, and a side cover portion that extends rearward from an inner edge of the front fender portion and that is substantially vertical. Therefore, the side surface of the cylinder of the engine can be opened to the outside, which improves the cooling efficiency of the engine. To above. A front side of the cylinder portion of the engine is rearward of the rear wall of the front fender portion, a front side thereof is disposed below the side cover portion, and at least a side portion of the cylinder portion of the engine is exposed in a frame. Since it is installed in the, the heat dissipation effect of the engine is great. In particular, the vehicle that runs on rough terrain is not a vehicle that runs at high speed, so I use my nerves to overheat,
This is so that the cooling effect can be obtained efficiently.

Furthermore, since the front cover devices are detachably fixed to the frame front portions so that the front edges of the left and right front fender portions and the center fender portion are located behind the front edges of the left and right front wheel balloon tires, respectively, when traveling, Rocks or trees will not contact the front end of the front cover device and damage the front cover device.

[Brief description of drawings]

1 and 2 show an embodiment of a front cover device for a saddle-ride type four-wheel vehicle for traveling on rough terrain according to the present invention. FIG. 1 is a side view and FIG. 2 is a plan view. FIG. 3 is a perspective view showing the frame structure of FIG. 1, FIG. 4 is a plan view showing the cover and seat of FIG. 2 removed, and FIG. 5 is a sectional view showing a connecting portion between an axle and a front wheel. 6, FIG. 6 is a sectional view taken along the line AA of FIG. 5, FIG. 7 is a partial sectional view showing the support structure of the steering shaft, and FIG. 8 is a sectional view taken along the line AA of FIG. 1 ... Body, 2 ... Frame, 3 ... Front wheel, 4 ... Rear wheel, 5 ... Balloon tire, 6 ... Link mechanism, 7 ... Bar handle, 11 ... Axle, 12 ... Front cover Device, 14 …… Steering shaft, 16 …… Step, 24,28 …… Arm, 29 …… Rear cover device, 30 …… Air intake, 36 …… Bumper, 121 …… Front fender part, 122 …… Center fender 123, top cover, 124 side cover, 121b top wall, 121c rear wall.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiki Shinohara 1299-54, Tomitsuka-cho, Hamamatsu-shi, Shizuoka (56) References Showa 55-138123 (JP, U) Showa 56-73694 (JP, U) US Patent 4082155 (US, A) Design Bulletin 538800 Similar 1 (JP, S) Design Bulletin 422304 Similar 1 (JP, S) Design Bulletin 365488 (JP, S)

Claims (1)

[Claims] 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 support portion that rotatably supports 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 a bar handle provided at the upper end of the steering shaft steers the two front wheels through a knuckle arm on the front wheel side that is linked to the lower end of the steering shaft. A saddle-type four-wheeled vehicle in which steps are arranged between the front and rear wheels on the left and right of the frame below the seat, and the wheels are driven by an engine mounted on the frame between the front and rear wheels to drive on rough terrain. smaller than the tire width W of the tire width W ₁ rear wheels (W 1 _<W) settings, than the width l ₂ of the front wheel outer rim width l ₁ bar steps above the left and right Placed side _(l 1 _{<l 2),} and an upper wall for covering the front balloon tires above the left and right, are integrally formed with the rear wall covering the tire backward, and the outer edge to the inside than the front balloon tires outside The left and right front fenders, the center fender that covers the upper center of the frame between these left and right front fenders, and the front wall that covers the front of the steering shaft by standing up diagonally from the center fender. And a top cover portion formed inside the left and right front fender portions, and a side wall directed upward so as to cover the left and right sides of the steering shaft, and a side extending in a substantially vertical direction extending rearward from an inner edge of the front fender portion. A front cover device is provided with each of the cover portions, and the cylinder portion of the engine is seen from the front side of the vehicle. Behind the rear wall of the front fender portion, the upper portion is disposed below the side cover portion, and at least the side portion of the cylinder portion of the engine is mounted on the frame in an exposed state. Saddle-type four wheels for running on uneven terrain, characterized in that the front cover devices are detachably fixed to the front portions of the frames so that the front edges of the center fenders are located behind the front edges of the left and right front wheel balloon tires. Car front cover device.