JPH0764294B2 - Off-road vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an all-terrain vehicle, and more particularly to a suspension structure of front wheels thereof.

(Prior Art) As an all-terrain vehicle such as a tricycle or a four-wheeled vehicle called a buggy, an engine is mounted on the rear part of the pipe frame,
A seat is installed in front of the frame, and front and rear wheels are suspended on the left and right of the front part of the frame in a trailing manner, which is disclosed in Japanese Utility Model Publication No. 57-56890.

In addition, in Japanese Utility Model No. 61-56185, a pair of front and rear lower pipes and upper pipes, which are respectively provided on the left and right sides of the front of the frame, are arranged so as to incline forward and upward. Disclosed are those in which the front wheels are pivotally attached to the pipes and the front wheels are suspended in a double wishbone manner.

(Problems to be solved by the invention) However, when the trailing arm (52) is adopted for suspending the front wheel (51) as shown in FIG. 5 like the former, the front end of the frame (53) is as shown in (l1). The amount of protrusion of the frame increases, and the frame weight increases. Horizontally (5
With the arrangement of 3), the frame (53) when traveling on rough ground
The ground contact of the front end becomes a problem.

And in the case of double-wishbone type front wheel suspension like the latter, if the lower pipe and the upper pipe are inclined forward, the amount of protrusion of the front end of the frame can be reduced to reduce the weight of the frame, and the ground contact at the front end of the frame is reduced. can do.

However, when viewed with reference to the vertical line passing through the axle center of the front wheel, the distances to the front pivot points of the lower arm and the upper arm, respectively, for the lower pipe and the upper pipe are larger than the distances to the rear pivot point, respectively. Therefore, there are the following inconveniences.

That is, since the distance from the vertical line passing through the axle center to the front pivot point of both arms is relatively large, there is room for improvement in terms of avoiding contact with the road surface protrusions on both arms,
Since the distance from the vertical line to the rear pivot points of both arms is relatively small, there is room for improvement in terms of securing rigidity against bending force acting on both arms from the front.

Therefore, an object of the present invention is to adopt a double wishbone front suspension, reduce the amount of protrusion of the front end of the frame to reduce the weight of the frame, reduce the contact of the front end of the frame with the ground, and project the road surface to both arms. It is an object of the present invention to provide an all-terrain vehicle in which the avoidance of contact with an object is improved and the rigidity against bending force acting on both arms from the front is also improved.

(Means for Solving Problems) In order to achieve the above object, the present invention has an engine mounted on a rear portion of a pipe frame, a seat is installed in front of the engine, and a front-rear direction is provided to the left and right of a front portion of the frame. A pair of lower pipe and upper pipe extending to the lower pipe and the upper pipe, respectively, in the rough terrain vehicle in which the lower arm and the upper arm that suspend the front wheels in a double wishbone type are pivotally attached to the lower pipe and the upper pipe, respectively, and the lower pipe and the upper pipe. While tilting forward, the distance to the front pivot points of the lower arm and the upper arm for the lower pipe and the upper pipe with respect to the vertical line passing through the axle center of the front wheel is set to be greater than the distance to the rear pivot point. The feature is that each is set to be small.

(Action) Since the double wishbone front suspension is adopted, and the lower pipe (4) and the upper pipe (5) supporting the lower arm (33) and the upper arm (32) are inclined forward and upward, the frame front end And the amount of contact of the front end of the frame with the ground is reduced.

And a vertical line (N) passing through the axle center (0) of the front wheel (14)
To the front pivot points of both arms (33) and (32) are relatively small, that is, the front pivot points are close to the rear vertical line (N). Therefore, it is possible to avoid contact between the front half of both arms (33) and (32) and the protrusion on the road surface.

Furthermore, the distances (B) and (E) from the vertical line (N) to the rear pivot points of both arms (33) and (32) are relatively large, that is, the rear pivot points are the vertical lines (N). Since the positions are farther away from each other, the front and rear lengths of the rear half portions of both arms (33) and (32) are increased, and the structure has improved rigidity against bending force from the front.

(Examples) Examples will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic side view of an all-terrain vehicle. An engine (11) and auxiliary equipment are mounted at the rear of the pipe frame (1), a seat (12) is installed in front of it, and further in front of it. A steering handle (13) is arranged in the.
A pair of left and right front wheels (14) and rear wheels (15) are suspended in front of and behind the frame (1), and (16) is a front fender.
(17) is a rear fender, and a roll bar (18) is further provided on the frame (1). A driver's vehicle seated on the seat (12) as shown by the phantom line in the figure has both legs in front of the frame (1). It is extended to the space and maneuvered.

As shown in FIGS. 2 and 3, front wheels (14) and rear wheels (1
Both 5) are suspended with double wishbone suspension in front of and behind the frame (1). That is, an A-shaped upper arm (22) and an I-shaped upper arm (22) are provided between the upper and lower parts of the knuckle (21) that supports the rear wheel (15) and the rear part of the frame (1).
Two lower arms (23), (23) of the mold are connected,
(24) is a hydraulic damper, and (25) is a radius arm.

An A-shaped upper arm (32) and a lower arm (33) are pivotally attached to the upper and lower sides of the knuckle arm (31) that supports the front wheel (14), and a tie rod (34) is provided at the rear of the knuckle arm (31). Is pivotally attached, and the hydraulic damper (35) is connected to the A-type lower arm (33).

In the above, the front part of the frame (1) is the main pipe (2), seat side pipe (3), front lower pipe (4), upper pipe (5), front end pipes (6), (7), stiffener pipe. (8), cross pipe (9), etc. That is, front end pipes (6) are installed at the front ends of the left and right main pipes (2), (2) extending in the front-rear direction, and the front lower pipes are provided at the front ends of seat side pipes (3) extending below the main pipe (2). (4) is connected to the front lower pipe (4)
The main pipe (2) and the seat side pipe (3) are connected to each other at the diagonal rising part (4a) of the rear part, and the front lower pipe (4) is formed by forming the front part to the front ascending slope part (4b). A front end pipe (7) is installed between the front ends of the.

Left and right stiffener pipes (8) are erected between this end pipe (7) and the end pipe (6) above it, and the front pipe rises near the front end of the main pipe (2) and the lower pipe rising part (4a). An inclined upper pipe (5) is erected, and the left and right upper pipes (5),
(5) A cross pipe (9) is installed between the rear ends.

A pair of left and right front lower pipes (4), (4) front rising slopes (4b), (4b) are arranged in parallel close to the vehicle width center line (C), and a rear rising part (4a). , (4a) gradually becomes wider toward the rear, and main pipes (2), (2)
Is bound to. Furthermore, the front ends of the pair of left and right upper pipes (5), (5) are located on the front pipes (4b), (4b) of the front pipes of the lower pipes (4), (4) and the main pipes (2), (4). 2), the upper pipes (5), (5) gradually become wider toward the rear and are connected to the rising parts (4a), (4a) at the rear part of the lower pipes (4), (4). There is.

The front lower pipe (4) has two U-shaped brackets (36), (36) on the front rising slope (4b) at the front.
Is fixed, and further two upper and lower U-shaped brackets (37), (37) are also fixed to the upper pipe (5). The lower brackets (36) and (36) have A-type lower arms (3
3) Pivot the front and rear ends of
The front and rear ends of the A type upper arm (32) are pivotally attached to 7) and (37), respectively.

Thus, the lower pipe (4) and the upper pipe (5)
Is inclined forward and upward, the amount of protrusion at the front end of the frame can be reduced as shown in (l ₂ ) of Fig. 4, and
It is possible to reduce the ground contact at the front end of the frame.

Then, as shown in FIG. 2, the axle center (0) of the front wheel (14)
Distances (A) and (D) to the front pivot points of the lower arm (33) and the upper arm (32) with respect to the lower pipe (4) and the upper pipe (5) with reference to the vertical line (N) passing through Are set to be smaller than the distances (B) and (E) to the rear pivot point, respectively. That is, A
Establish the relationship of <B, D <E. In the embodiment, A <D, B
<E relationship is also established.

In this way, the distances (A) and (D) from the vertical line (N) passing through the axle center (0) of the front wheels (14) to the front pivot points of both arms (33) and (32) are made relatively small. In other words, by bringing the front pivot point close to the vertical line (N) on the rear side, it becomes easy to avoid contact between the protrusions of the road surface with respect to the front half of both arms (33) and (32). .

Furthermore, by making the distance from the vertical line (N) to the rear pivot point of both arms (33) and (32) relatively large, in other words, by making the rear pivot point farther than the vertical line (N). ,
In particular, the longitudinal length of the rear half of both arms (33) and (32) is increased, and the rigidity against bending force from the front is improved.

As described above, according to the present invention, since the lower pipe and the upper pipe are both in the forward rising inclination state, the amount of protrusion of the frame front end can be reduced to reduce the weight of the frame, and the frame front end In addition to reducing the ground contact of each arm, the distance to the front pivot point of each arm with respect to both pipes is set smaller than the distance to the rear pivot point based on the vertical line passing through the center of the front wheel axle. Therefore, it is possible to improve the avoidance of contact between the both arms and the protrusion on the road surface and the rigidity against the bending force acting on both arms from the front.

[Brief description of drawings]

FIG. 1 is a schematic side view of an all-terrain vehicle, FIGS. 2 and 3 are side views and a half plan view of an all-terrain vehicle and a suspension, FIG. 4 is a partial plan view of the structure, and FIG. It is a partial top view of a conventional structure. In the drawing, (1) is a frame, (2) is a main pipe,
(3) is a seat side pipe, (4) is a front lower pipe, (5) is an upper pipe, (11) is an engine,
(12) seat, (14) front wheel, (31) knuckle,
(32) is the upper arm, (33) is the lower arm, (3
4) is a tie rod, (35) is a damper, and (36) and (37) are brackets.

Claims (1)

[Claims] 1. An engine is mounted on a rear portion of a pipe frame, a seat is installed in front of the engine, and a pair of a lower pipe and an upper pipe extending in the front-rear direction are provided on the left and right of the front portion of the frame, and the lower pipe and the upper pipe are provided. In an all-terrain vehicle in which a lower arm and an upper arm for suspending a front wheel on a pipe and a double wishbone type are pivotally attached respectively, the lower pipe and the upper pipe are inclined forward, and a vertical line passing through the center of the axle of the front wheel. Based on, the distances to the front pivot points of the lower arm and the upper arm with respect to the lower pipe and the upper pipe respectively are set smaller than the distances to the rear pivot points, respectively.