JPS62168782A - Saddling type four-wheel barrow 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.

C1 Problems to be Solved by the Invention As described above, in the past, tricycles were the only way to drive stably on rough terrain, and a vehicle for traveling on rough terrain with better maneuverability and a better external shape was desired. 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. Further, in the vehicle of the prior art, the front fender and the 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. A straddle-type four-wheeled vehicle with steps placed between the front and rear wheels on the left and right sides of the vehicle body, approximately below the center of the seat, and driven by a bar handle and an engine mounted between the front and rear wheels to drive the wheels over rough terrain. A fender that covers the upper portions of the left and right front wheels, a bridge section that connects these fenders, and a front section that stands up diagonally rearward from behind the bridge section and covers the steering shaft mI side. A front cover is formed by integrally constructing a wall and left and right side walls provided between the front wall and the fender, and a fender that covers the upper portions of the left and right rear wheels is connected to each other. A rear cover is formed by integrally configuring a connecting portion for connecting the front cover and a side wall mounted on a side portion of the vehicle body, and an extension portion is formed at a rear end portion of the side wall of the front cover and an end portion of the side wall of the rear cover to overlap with each other,
These extensions are fastened to each other to form an integral structure, and an opening is formed at the rear of the upper part of the front cover, and an opening is formed at the upper part of the rear cover. This is due to the fact that the sheet was placed on it.

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. To make a left turn, right turn, turn, etc., the bar handle is rotated in the desired direction of travel, just like a normal two-wheeled vehicle. In response to this, the steering shaft is rotated 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.

Further, the front cover and the rear cover are integrally formed with the left and right fenders and side walls, and are arranged in an overlapping manner to improve the appearance.

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.
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, l 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 wheels 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 frames 2 each include a pair of upper frames 8. ．． 8. and the lower frames 95, 9□, between these earth frame frames 81, 8□, and the lower frame 9.

9. It is composed of a plurality of spacer frames 10 that maintain a predetermined distance between them. Above upper frame 81.8
□ bends the tip portion 801 forward and diagonally downward, forms a predetermined length of an inclined portion 803 that slopes downward at a gentle angle behind the bent portion 802, and forms a rear end portion behind the inclined portion 803; 804 horizontally or slightly upwardly. This upper frame8. ．． 8. The distal end of the front cover 12 is connected to the axle 11 that supports the front wheel 3, and a U-shaped fixing frame 13 for screwing the front cover 12 is attached between the distal end portions 801. Upper frame 8
A steering head 15 that supports the steering shaft 14 of the bar handle 7 is provided in the bent portion 802 of 8, 8□.

On the other hand, the lower frame 9+, L 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 83, 8□, respectively. The lower frame 9.9! A step 16 for the driver is installed in the middle of the step 16.
The step 16 is located inside a line connecting the outside of the front wheel 3 and the rear axle 4. Lower frame 9.9! bending part 9
02 includes a support portion 90 that supports the drive shaft 17 of the rear wheel 4.
3 is provided.

These, upper frame 8. ．． 8□ and lower frame 9□9
The engine 18, fuel tank 19, etc. are mounted in the space A formed by □.

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 vibe 2 integrated with support shaft 22
2a is pivotally supported on the frame 20. A spacer 221. is provided between the support pipe 22a and the king pin 21. and Bunone 222 are 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 the left and right tie lofts 25 is rotatably supported by the arm 24 via a pin 26.

The other end of the tie rod 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, the covers disposed as the exterior of the body l are the front cover 12,
The front cover 12 and rear cover 29 are divided into two parts, and the front cover 12 and rear cover 29 integrally form a front fender 121 and a rear fender 291, respectively. Front cover 12
is a front fender 121 that covers the upper parts of the left and right front wheels 3.
, a bridge portion 122 that connects these fenders 121 to each other, a front wall 123 that stands up diagonally rearward from behind the bridge portion 122 and covers the front of the steering shaft 14, and this front wall 123 and the fender. The left and right side walls 124 provided between the fender 121 and the left and right side walls 124 are formed integrally with each other. The front wall 12
3 is a front plate 1 provided with an air intake port 30 and a screw hole 31;
23a, and left and right sides vi 123b provided toward the rear from both sides of the front plate 123a, and the inside at the rear of the upper part is formed into an opening where an instrument panel and the like are disposed.

The side wall 124 is provided continuously at the lower end of the side Fi 123b, and its front portion is integrally formed 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 the screw holes 31, and screwed through the screw holes 32 into the screw holes 34a of the protruding pieces 34 provided on the inclined parts 803 of the upper frames 81, 8□. It's stopped.

On the other hand, the rear cover 29 includes left and right rear fenders 291 that cover the upper part of the rear wheel 4, a connecting part 293 that connects these rear fenders 291 and has a vertically elongated opening 292 in the center, and a connecting part 293 on both sides of the connecting part 293. A side wall 294 connecting the inner edge of the fender 291 is integrally molded. Side wall 2 of this rear cover 29
The front end extension 295 of the front cover 12 is formed to overlap the rear end extension 125 of the side wall 124 of the front cover 12. This overlamp 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 screwed to the upper frames 8+, 8t at several locations, and the seat 35 is placed on the rear opening of the front cover 12 and the upper surface of the opening 292 of the rear cover 29.

When driving the straddle-type four-wheeled 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, the steering shaft 14 rotates by a predetermined angle, and as the arm 24 rotates, the link mechanism 6 is operated. 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.

Furthermore, when the vehicle is running, wind that hits the front surface of the front cover 12 is guided 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 handle. 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 a bar handle and a bar step, so it can be operated like a two-wheeled vehicle, and it is easy to shift your weight when making sharp turns. Further, since the front cover and the rear cover are molded separately and assembled so that they partially 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. There is also an opening at the rear of the front cover and an opening at the rear of the cover, so you can access the battery by removing the seat.

It is easy to inspect and repair the air cleaner, fuel tank, etc. Furthermore, since the front cover and the rear cover are individually molded, molding is easy and they can be easily replaced when damaged.

[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 cross section taken along line A-A of Fig. 5. 7 are partial cross-sectional views showing the support structure of the steering shaft, and FIG. 8 is a cross-sectional view taken along the line A--A in FIG. 7. l...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, 29
1... Rear fender, 292... Opening,
293...Connection part, 294...Side wall,
295...Tip extension. Figure 1 Figure 2 29] Figure 3 Figure 4 Figure 5 Figure 6

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 mounted 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. an extension part is formed, and these extension parts are fastened to each other to form an integral structure, and an opening is formed in the upper rear part of the front cover, and an opening part is formed in the upper part of the rear cover, and the extension part is formed by the front cover and the rear cover. A straddle-type four-wheeled vehicle for traveling on rough terrain characterized by a vertically long seat placed on the top surface of the opening.