JPS62168781A - Saddling type four-wheel barror for travelling on uneven ground - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a straddle-type four-wheeled vehicle for traveling on rough terrain, which is suitable for traveling on rough terrain and has an improved appearance.

b. Prior Art Vehicles used for traveling on rough terrain are required to be easily balanced and have good maneuverability when the vehicle is driven by a driver. Therefore, conventionally, tricycles, which are improved versions of two-wheeled vehicles, have been widely used, but when making sharp turns, the driver must shift his or her weight, and as the weight shifts, the stability of the vehicle deteriorates.

On the other hand, in regular four-wheeled vehicles, the steering mechanism is steered by a round steering wheel or an airplane-style steering wheel, and the seat is a sit-down type, so it is difficult to make sharp turns due to the shift of weight or maintain the balance of the vehicle. It has the disadvantage of being difficult.

Problems to be solved by the invention It was rare. In addition, there is a prior art (Japanese Utility Model Publication No. 56-73694) in which the front wheels are arranged slightly apart from each other as a four-wheeled vehicle for traveling on rough terrain.

However, since the frame structure of such vehicles is almost the same as that of a two-wheeled vehicle, there is a limit to increasing the wheel spacing.
The structure was similar to that of a tricycle. Furthermore, in the vehicle of this prior art, the front fender and rear fender are integrated, which makes molding difficult and requires replacement in the event of damage, which is uneconomical.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a straddle-type four-wheeled vehicle for running on rough terrain, which is suitable for running on rough terrain and has an improved appearance.

d. Means for Solving the Problems The present invention includes two front wheels and two rear wheels each equipped with balloon tires at the front and rear parts of a frame, and a steering shaft is rotatably supported on the frame. A seat is placed vertically in the approximate center of the vehicle body from the rear of the steering head toward the rear of the vehicle body, and the front two wheels are steered by a bar handle that is supported by the upper end of the steering shaft and has grips on both left and right ends. Steps are placed on the left and right sides of the vehicle, approximately below the center of the seat, between the front and rear wheels.
This is a straddle-type four-wheeled vehicle that travels on uneven terrain by steering the bar handle and driving the wheels with an engine mounted between the front and rear wheels, which includes fenders that cover the upper portions of the left and right front wheels, and a space between these fenders. a bridge section that connects the front wall, a front wall that stands up diagonally rearward from the rear of the pre-fuji section and covers the front of the steering shaft, and left and right side walls that are provided between the front wall and the fender. A fender that is integrally constructed to form a front cover and that covers the upper portions of the left and right rear wheels, a connecting portion that connects these fenders, and a side wall that is vertically disposed on the side of the vehicle body is integrally constructed. The present invention is characterized in that a rear cover is formed by forming a rear cover, and extension portions that overlap each other are formed at the rear end of the side wall of the front cover and the front end of the side wall of the rear cover, and these extension portions are fastened to each other to form an integral structure.

e. Function: When driving the straddle-type four-wheeled vehicle for traveling on rough terrain according to the present invention, the driver straddles the seat and places his feet on the steps.
Grip the bar handle with both hands when driving. Then, in order to make a left turn or right turn, the bar handle is rotated in the desired direction of travel, like a normal two-wheeled vehicle. In response to this, the steering shaft moves by a predetermined angle, and the link mechanism is operated in accordance with the rotation of the arm.

As a result, the front wheels are steered by the necessary angle, and the direction of travel of the vehicle body is changed. When making sharp turns, if you change the direction of the bar handle and shift your weight at the same time, the inner balloon tire will dent.
This performs the same function as a differential gear in a normal four-wheeled vehicle, allowing it to make sharp turns.

The front cover uses the left and right fenders and side walls to guide airflow toward the rear when the vehicle is running, helping to cool the engine.

Furthermore, the front cover is designed to improve its appearance by integrally molding the left and right fenders and side walls.

f. Examples Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is a side view showing an embodiment of the straddle-type four-wheeled vehicle for traveling on rough terrain according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG.
FIG. 4 is a perspective view showing the frame structure shown in the figure, and FIG. 4 is a plan view from which the cover, sheet, etc. of FIG. 2 are removed.

In FIGS. 1 and 2, 1 is a saddle-type body, which has two front wheels 3 and two rear wheels 4 mounted on a frame 2 configured as shown in FIG. The axles 3 and 4 are equipped with so-called balloon tires 5, which have low internal pressure and a wide contact surface with the ground. The steering mechanism for steering the wheels 3.4 includes a link mechanism 6 as shown in FIG. 4, and the handle for operating the link mechanism 6 includes a bar handle 7 with grips 701 attached to both ends. There is.

The structure of the frame 2 will be explained with reference to FIG. The frame 2 includes a pair of upper frames 8□8t and lower frames 91.9z, and these upper frames 8.9z. ．． 8. It is composed of a plurality of spacer frames 10 that maintain a predetermined distance between each other and between the lower frames 91°9□. The upper frame 8, . 8. bends the tip portion 801 forward and diagonally downward, and the bent portion 8
02 Rearward inclined part 803 that slopes downward at a gentle angle
is formed to a predetermined length, and the rear end portion 804 behind the inclined portion 803 is bent horizontally or slightly upward. The tips of the upper frames 88, 8□ are connected to the axle 11 that supports the front axle 3, and between the tips 801 there is a U-shaped fixing frame 13 for screwing the front cover 12. is installed. Upper frame 8I, 8□
A steering hood 15 for supporting the steering shaft 14 of the bar handle 7 is provided at the bent portion 802 of the bar handle 7.

On the other hand, the lower frame 98, 9□ has its tip connected to the axle 11.
The rear end portion 901 is bent to stand up and connected to the rear end portions 804 of the upper frames 88, 8□, respectively. The lower frame9. , 9□ is equipped with a step 16 for the driver.
6 adopts a bar type, and this step 16 is provided so as to be located inside a line connecting the outside of the front wheel 3 and the rear wheel 4. Lower frame9. ．． A support portion 903 that supports the drive shaft 17 of the rear wheel 4 is provided in the 9□ bent portion 902 .

These, upper frame 8. ．． 82 and lower frame 9
．． 9! An engine 18, a fuel tank 19, and the like are mounted in a space A formed by the engine 18 and the fuel tank 19.

Next, a steering mechanism for steering the front wheels 3 will be explained with reference to FIG. 4.

The front wheel 3 is mounted so as to be steerable on a U-shaped frame 20 mounted on both ends of the axle 11 as shown in FIGS. Support pipe 2 provided integrally with support shaft 22
2a is pivotally supported on the frame 20. A spacer 221. and a bushing 222 is loosely fitted.

The steering shaft 14 is connected to the steering wheel 1.
5, as shown in FIGS. 7 and 8, a resin spacer 151 is attached.
The upper end is rotatably supported by bolting through the axle 11, and the lower end is rotatably supported by a support portion 23 provided at an intermediate position of the axle 11. An arm 24 is attached to the lower end of the steering shaft 14, and one end of left and right tie rods 25 is rotatably supported by the arm 24 via a pin 26. The other end of the tie loft 25 is rotatably supported by an arm 28 attached to the wheel support shaft 22 by a pin 27. 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 axle 4 is supported by a rear axle 17 to which power from an engine 18 is transmitted via a power transmission mechanism (not shown).

Next, returning to FIGS. 1 and 2, lAP of body 1
The cover disposed as an accessory is the front cover 12.
The front cover 12 and the rear cover 29 are divided into two parts, and the front cover 12 and the rear cover 29 integrally form a front fender 121 and a rear fender 291, respectively. The front cover 12 includes a front fender 121 that covers the upper portions of the left and right front axles 3, a bridge portion 122 that connects these fenders 121, and a bridge portion 122 that stands up diagonally rearward from the rear of the bridge portion 122, and extends from the rear of the bridge portion 122 to the steering wheel. A front wall 123 that covers the front of the shaft 14, and left and right side walls 124 provided between this front wall 123 and the fender 121.
and are formed in one direction. The bridge portion 122 is formed in a j2 recess in the fender 121. The front wall 123 includes a front plate 123a provided with an air intake port 30 and screw holes 31, and left and right side plates 123b provided rearward from both sides of the front plate 123a. The side wall 124 is provided continuously at the lower end of the side plate 123b, and its front portion is formed integrally with the left and right fenders 121, and its rear portion faces both sides of the engine 18 to form a skirt portion 124a. A protruding piece 33 having a screw hole 32 is provided at the rear end edge of this side wall 124 .

The front cover 12 is screwed to the fixing frame 13 through screw holes 31, and through screw holes 32. 7 is screwed into a screw hole 34a of a protruding piece 34 provided on an inclined portion 803 of an upper frame 8□8□.

On the other hand, the rear cover 29 includes left and right rear fenders 291 that cover the upper part of the rear wheels 4, and these rear fenders 291.
A connecting part 293 that connects the two sides and has a vertically elongated opening 292 formed in the center, and side walls 294 that connect the inner edges of the fender 291 and the side walls 294 that are attached to both sides of the connecting part 293 are integrally molded. The leading end extension 295 of the side wall 294 of the rear cover 29 is formed to overlap the rear end extending part 125 of the side wall 124 of the front cover 12. This overlap portion is formed to be rearward of the engine 18.

Further, the engine 18 and the fuel tank 19 are arranged below the opening 292. This rear cover 29 is attached to the upper frame 8. ．． 8□ is screwed at several places, and the seat 35 is placed on top of the rear cover 29.

When driving the straddle-type four-wheel vehicle for traveling on rough terrain according to the present invention, the driver straddles the seat 35, places his feet on the step 16, and grips the grip 701 of the bar handle 7 with both hands. Run. To make a left turn, right turn, turn, etc., the bar handle 7 is rotated in the desired direction of travel, like a normal two-wheeled vehicle. In response to this, the steering shaft 14 is rotated by a predetermined angle, and the link mechanism 6 is operated in accordance with the rotation of the arm 24. by this,
The front wheels 3 are steered by a necessary angle to change the direction of travel of the vehicle body. Then, when making a sharp turn, the direction of the bar handle 7 is changed and the weight is shifted at the same time, causing the inner balloon tire 5 to dent, similar to the differential gear of a normal four-wheeled vehicle. This function is used to perform sharp turns, etc.

Further, when the vehicle is running, the wind that hits the front surface of the front cover 12 is directed toward the rear and lower rear of the vehicle along the front fender 121 and the skirt portion 124a.

The engine 1 is located in the center of the frame 2.
Cool the sun effectively.

Note that the front wall 123 may be formed separately and assembled to the main body consisting of the fender 121 and the bridge portion 122.

g. Effects of the Invention As described above, the straddle-type four-wheeled vehicle for traveling on rough terrain of the present invention has the following effects.

Two front wheels and two rear wheels are provided, each of which is equipped with a balloon tire, and the front wheels are rotatably supported on both sides of the axle, and a steering mechanism for steering these front wheels is operated by a bar bundle. This makes it more stable than a tricycle, and the characteristics of the balloon tires allow it to make sharp turns. In addition, the seat is saddle-type, with bar handles and bar steps, so it can be operated like a two-wheeled vehicle, and it is easy to shift your weight when making sharp turns. Furthermore, since the front cover and the rear cover are molded separately and assembled so that parts of them overlap each other vertically, molding is easy and a sense of unity can be obtained after assembly.

Furthermore, since the left and right fenders of the front cover and rear cover are integrally molded, the appearance can be improved.

[Brief explanation of drawings]

1 and 2 show an embodiment of the straddle-type four-wheeled vehicle for traveling on rough terrain according to the present invention, with FIG. 1 being a side view and FIG. 2 being a plan view. FIG. 3 is a perspective view showing the frame structure of FIG. 1;
Fig. 4 is a plan view of Fig. 2 with the cover and seat removed, Fig. 5 is a sectional view showing the joint between the axle and the front wheel, and Fig. 6 is a sectional view taken along A-AvA 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 A--A in FIG. 7. 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, 28...Arm, 29...Rear cover, 30...・Air intake. 121...Front fender, 122...Bridge portion, 123...Front wall, 123a
...Front plate, 123b...Side plate, 12
4...Side wall, 125...Rear end extension part, 1
24a...Skirt part, 291...Rear fender,
292...Opening part, 293...Connection part,
294...Side wall, 295...Tip extension. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Two front wheels and two rear wheels each equipped with balloon tires are installed at the front and rear of the frame, and the steering shaft is rotatably supported on the frame.From the rear of the steering head toward the rear of the vehicle, approximately at the center of the vehicle body. The front two wheels are steered using a bar handle that is supported by the upper end of the steering shaft and has grips on both the left and right ends, and the step is placed between the front and rear wheels so that the seat is positioned approximately below the center of the vehicle body. This is a straddle-type four-wheeled vehicle that is arranged on the left and right sides and is operated by steering bar handles and driven by an engine mounted between the front and rear wheels to drive the wheels over rough terrain. , a bridge section that connects these fenders, a front wall that stands up diagonally rearward from behind the bridge section and covers the front of the steering shaft, and a front wall that is provided between the front wall and the fender. a fender integrally configured with left and right side walls to form a front cover and covering the upper portions of the left and right rear wheels;
A rear cover is formed by integrally forming a connecting part that connects these fenders and a side wall vertically provided on the side of the vehicle body, and the rear end of the side wall of the front cover and the tip of the side wall of the rear cover overlap each other. A straddle-type four-wheeled vehicle for traveling on rough terrain, characterized in that an extended portion is formed and these extended portions are fastened together to form an integral structure.