JPH01215686A - Off-road running vehicle - Google Patents

Abstract

PURPOSE:To make it possible to allocate load satisfactorily by arranging a cargo bed provided in rear of a saddle type seat in the center section of a vehicle body so that the longitudinal center line of the cargo bed is located in front of the axis of a rear wheel axle, and by disposing a damper between a frame member and a rear wheel axle support member. CONSTITUTION:A vehicle body frame 1 includes upper and lower left and right frames 1a, 1b in pairs, extending longitudinally in the front section of a vehicle body, a pair of right and left seat rails 1c extending rearward from the rear section of the upper frame 1b, and lower members 1d for supporting the sear rails 1c on the lower side of the latter. Further, a saddle type seat 6 is supported on the upper frames 1b so as to be positioned in the center section of the vehicle body, and a cargo bed 10 including a frame member 11 and a floor plate 15 covering rear right and left wheels 8 above them is supported on the seat rails 1c. In this arrangement, the cargo bed 10 is arranged so as to be located at its longitudinal center C in front of the axis of a rear wheel axle 29. a pair of right and left dampers 25 are disposed between an axle pipe 22 and the rear end parts of the seat rails 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an off-road vehicle equipped with wide tires or wide low-pressure tires.

[Conventional technology]

A vehicle for traveling on rough terrain is a tricycle or four-wheeled vehicle equipped with a bar-shaped steering handle and a saddle-shaped seat, equipped with wide tires with normal air pressure or wide low-pressure tires with low air pressure. , and has excellent driving performance on uneven terrain such as sand and soft roads. For this reason, in recent years, vehicles for traveling on rough terrain have come to be used not only for driving on rough terrain, but also for various tasks such as agricultural work and forestry, and as a result, they have been used to carry cargo such as work tools and harvested products. is requested to be loaded. As a solution to this problem, there is, for example, one disclosed in Japanese Patent Laid-Open No. 178279/1983. This is equipped with an iron pipe carrier behind the seat that integrally covers the rear upper part of both rear wheels, and a shock absorber is installed in the corresponding part of the seat rail in front of the carrier and at the rear end of the swing arm. It is interposed between the

[Problem to be solved by the invention]

However, this structure has the disadvantage that the carrier is too small to load large or heavy loads.

This is because the carrier is supported at the rear of the shock absorber and rear wheel axle by a cantilevered seat rail, and if the carrier is extended to the rear of the vehicle to make it larger, the center of load of the cargo will be pushed further back. This is because not only does the load acting on the seat rail increase, but the distributed load on the front wheels also decreases. The present invention was made in view of these circumstances, and provides a vehicle for running on rough terrain that can carry large and heavy loads, has good running stability when loaded, and can also reduce the load acting on the frame. This is what we provide.

[Means to solve the problem]

The all-terrain vehicle according to the present invention has a cargo platform having a floor plate that integrally covers the upper parts of both the left and right rear wheels on a frame member extending rearward from the seat, the center of which in the longitudinal direction is from the axis of the rear wheel axle. A pair of left and right shock absorbers are interposed between the frame member and the rear wheel shaft support member, and the upper ends of the shock absorbers are pivoted near the longitudinal center of the loading platform. It is something.

[Effect]

In the present invention, the load of the luggage acts on the front wheels and the rear wheels, and the frame member is supported by a shock absorber near the area where the load of the luggage is most applied.

〔Example〕

Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings. Fig. 1 is a side view showing the off-road vehicle according to the present invention, Fig. 2 is a plan view, Fig. 3 is a rear view, and Fig. 4 is a sectional view taken along the line TV-rVV in Fig. 3. The figure is a sectional view taken along the line V-V in FIG. 2, and the reference numeral 1 in FIGS. 1 to 3 indicates the vehicle body frame. The vehicle body frame 1 includes a pair of left and right lower frames las extending in the front-rear direction at the lower part of the front part of the vehicle body, and the upper part of the front part of the vehicle body extends in the front-rear direction so as to form a space between the lower frames 1a. A pair of left and right upper frames 1b, this upper frame 1b
The vehicle is comprised of frame members such as a pair of left and right seat rails 1c extending substantially horizontally and parallelly from the rear of the vehicle to the rear, and a pair of left and right lower members 1d that support the seat rails 1c from below. The lower frame 1a has a pair of left and right front wheels 3 that are steered by a rod-shaped steering handle 2 at its front end.
It supports the engine 4 as well as the engine 4, and the rear part is curved to the rear. On the other hand, the upper frame 1b supports the fuel tank 5 and a saddle-shaped seat 6 disposed at the center of the vehicle body behind the fuel tank 5, and the rear part thereof is bent upward. The rear end portions of the lower frame la and the upper frame 1b are connected to a pivot 7. A swing arm 9 that supports a pair of left and right rear wheels 8 in a vertically swingable manner is pivotally supported on this pivot portion 7. The front wheels 3 and rear wheels 8 are wide, low-pressure tires that are used with low air pressure. Here, the swing arm 9, an axle tube, and a rear wheel shaft, which will be described later, constitute one component that suspends the rear wheel 8 in an axle-type manner.

The seat 6 has a length necessary and sufficient for one occupant to ride in a stable posture. In other words, the seat is shorter in the front-rear direction than the conventional vehicle seat for rough terrain driving, which allows the seat to be seated even when the hips are pulled back. This is to ensure a larger loading space behind the seat. And the seat rail 1c
The rear part is wider than the seat width and extends to approximately the center of the rear wheel 8 which is behind the seat 6. Lower member 1d
extends rearward from the pivot portion 7 above the swing arm 9 in parallel with the seat rail 1c, and the left and right lower members ld
The space between them is connected by a cross member 1e. Also, the lower member 1
d and the seat rail 1c are connected by a side member 1f.

Reference numeral 10 denotes a loading platform which is composed of a frame 11 supported on the seat rail Ic and a floor plate to be described later, and has a large loading space so that even large luggage B can be loaded thereon. Frame body 11
As shown in a perspective view in FIG. 6, it is composed of an upper frame 11a made of a square pipe forming the outer periphery and a lower frame 11b made of a round pipe provided below the upper frame 11a. The upper frame 11a is formed in a wide rectangular shape, and the lower frame 11b is formed in a rectangular parallelepiped shape having a width narrower than the facing interval of the seat rails 1c, and the length of these members is longer than the diameter of the rear wheel 8. It is set. llc has an upper frame 11a and a lower frame 1
Lid is a reinforcing member that connects the upper frame 11a and the lower frame 11b in the diagonal direction. Lie and 11'f are reinforcing members that horizontally and vertically connect the lower frame 11b. It is a reinforcing member. 12,13
．． 14 is a bracket, and the bracket 12 is the lower frame 11
It is fixed to a cross member 1e that is provided on the lower side of a member that forms the lower part of the lower member 1d and extends in the front-rear direction, and that connects the rear end portions of the lower member 1d. In addition, the bracket 13 is
1c and fixed to the rear end of the silt rail IC. The bracket 14 is provided below the front end of the upper frame 11a and is fixed to a portion of the seat rail lc close to the seat 6. Here, the positions where these brackets 12, 13, and 14 are provided and fixed are such that the center of the loading platform 10 in the longitudinal direction indicated by the center line C in FIG. It is set to be located further forward than the

A floor plate 15 is supported on the frame 11 and integrally covers the upper parts of both the left and right rear wheels 8. That is, the floor plate 15 has a length extending from near the front edge of the rear wheel 8 to near the rear edge, and
It has a width that protrudes laterally from the center of the vehicle body. As shown in FIG. 5, this floor plate 15 is made of a flat iron plate with unevenness extending in the front-rear direction of the vehicle body, and has an edge bent downward. It is divided into side floor plates 15a, 15a which are fixed so as to cover the upper part of the seat rails 8, and a central part floor plate 15b which covers the upper part between the left and right seat rail ICs.

16 is a bottom member supported on the reinforcing member lie of the lower frame 11b. The bottom member 16 is made of synthetic resin and is integrally formed into a box shape that is open upward and backward.
1b. That is, the bottom member 16 provides a storage chamber below the floorboard surface and between the left and right rear wheels 8. Reference numeral 17 denotes a lid body pivotally attached to the lower side of the rear end of the lower frame 11b with a hinge 18, and opens and closes the storage chamber.

The swing arm 9 is configured by connecting a pair of left and right arms 9b to a cylindrical part 9a rotatably supported between the pivot parts 7, and the power of the engine 4 is connected between the left and right arms. A drive shaft housing 21 that accommodates a drive shaft that is transmitted to the rear wheels 8 is provided. 22. An axle tube serving as a rear wheel support member is connected to the rear end of the arm 9b and supports the rear wheel shaft 29 of the left and right rear wheels 8. 23 is a differential device provided between the axle tubes 22, 22, which decelerates the rotation of the drive shaft housed in the drive shaft housing 21 and converts it into a direction around the axis of the axle. 24 is a traction device for towing a cart or the like, and is fixed to the axle tube 22.

Each of the arms 9b is formed such that the distance between the two arms 9b gradually increases toward the rear of the vehicle body, and the rear end portions thereof protrude further to the side of the vehicle body than the lower member 1d.

A pair of left and right shock absorbers 25 are interposed between the axle tube 22 and the rear end of the seat rail IC and absorb the vertical movement of the arm 9b. Here, the shock absorbers 25 are arranged on both sides of the bottom member 16 so as to be close to the rear wheels 8, and the upper end of the shock absorbers 25 is pivoted near the center of the loading platform 10 in the longitudinal direction and slightly behind the center in the longitudinal direction. It is said that A buffer rubber 26 is provided at the intersection of the arm 9b and the lower member ld. More specifically, the buffer rubber 26 is formed in a spindle shape whose cross-sectional area gradually decreases toward the bottom, and is attached to the upwardly inclined lower surface of a bracket 27 provided on the lower side of the lower member 1d. On the other hand, on the arm 9b side, there is provided a seat 28 on which the cushioning rubber 26 comes into contact. When this cushioning rubber 26 is loaded with a heavy load and travels, the receiver contacts the seat 28 before the shock absorber 25 bottoms out, causing the shock absorber 25 to reach the bottom.
In cooperation with the shock absorber 25, a large shock absorbing force is generated to improve ride comfort, and the shock absorber 25 itself is protected.

Reference numeral 31 denotes left and right rear wheels made of synthetic resin that cover the front of the left and right rear wheels 8. These rear fenders 31 are attached and supported at the front part of the frame 11 so that a space is formed between them and the rear wheel 8, and are close to the step 32 to the extent that they do not come into contact with the legs of the occupant placed on the step 32. has been done. 33
is a mudguard mounted and supported at the rear of the frame 11. Of the space formed between the rear fender 31 and the rear wheel 8, a muffler 34 is disposed in the space on the right side of the vehicle body, and a battery 35 is disposed in the space on the left side of the vehicle body.

The muffler 34 is formed into a cylindrical shape and has a built-in spark collector. 7 and 8 are side views showing how these members are attached, and the muffler 34 is attached to the bracket 36 at the attachment part of the right seat rail lc with its axis in the vehicle width direction.
is supported through. The battery 35 is housed in a pantry box 37, and is mounted and held on a support plate 38 fixed to the outside of the lower left member 1d. An exhaust pipe 39 extends from the engine 4 and is connected to the inner surface of the muffler 34. A tail pipe 40 is connected to the rear surface of the muffler 34, and extends rearward substantially horizontally through a space formed between the right rear wheel 8 and the frame body 11.

Reference numeral 41 designates a shelf body disposed near the rear of the seat 6, protruding upward from the top surface of the seat, on which luggage placed on the floorboard 15 is moved forward. This shelf body 41 includes an iron pipe 41a bent into an inverted U shape, a cross member 41b connecting the sides of this iron pipe 41a, and a back pad 41c attached to the front side of this cross member 41b. Consisting of The iron vibrator 41a is pivoted below the upper surface of the seat to a pair of left and right stays 42 that protrude from the front side of the upper frame 11a so as to face each other with the seat 6 in between. is supported by Although not shown in the figure, the stay 42 also has a shelf 41 that can be selectively placed in a state where it stands up with respect to the seat 6 as shown by a solid line in FIG. A locking device is provided to hold the device in place.

In the vehicle for traveling on rough terrain configured in this way, not only can a large load B be placed on the loading platform 10 and transported (
Since the longitudinal center line C of the cargo platform 10 is set to be located forward of the axis of the rear wheel shaft 29, the weight W of the cargo B acts on the front side of the vehicle body rather than the rear wheel shaft 29. Therefore, the weight W acts to increase the distributed load on the front wheels and the distributed load on the rear wheels. Therefore, even when the vehicle is loaded, it is possible to prevent the frictional force between the front wheels 3 and the road surface from becoming small, thereby improving running stability.

In addition, since the shock absorber 25 that supports the seat rail lc is pivotally mounted near the center line C in the longitudinal direction of the cargo platform 10, the seat rail lc can be supported near the part where the load of the cargo B is most applied. Since the seat rail IC is not cantilevered like in the past, the seat rail IC
It is also possible to reduce the load acting on the In other words,
Much of the load of the luggage B can be directly received by the shock absorber 25. Furthermore, since the suspension is an axle type suspension in which the left and right rear wheels 8 are connected by the rear wheel shaft 29, there is an advantage that the loading platform 10 is less inclined when turning, and the load is less likely to collapse.

In the above embodiment, an example in which the swing arm 9 is used as an axle-type suspension has been described, but the structure of the axle-type suspension is not limited to this. For example, a link mechanism or the like may be used to 8 can be modified as appropriate, such as by supporting it so that it can move freely in the vertical direction while restricting its movement in the front-rear direction.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a loading platform having a floor plate that integrally covers the upper portions of both left and right rear wheels on a frame member extending rearward from the seat, with the center in the longitudinal direction being from the axis of the rear wheel axle. A pair of left and right shock absorbers are interposed between the frame member and the rear wheel shaft support member, and the upper ends of the shock absorbers are pivoted near the longitudinal center of the loading platform. Therefore, the distributed load on the front wheels can be increased by the load, and the frame member can be supported by the shock absorber near the area where the load of the load is most applied.

Therefore, even when loading cargo, the frictional force between the front wheels and the road surface is prevented from decreasing, and most of the load of the cargo can be directly received by the shock absorber, so it is not only possible to load large and heavy cargo. , it is possible to improve running stability when loaded and to reduce the load acting on the frame.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an off-road vehicle according to the present invention;
FIG. 2 is a plan view, FIG. 3 is a rear view, FIG. 4 is a sectional view taken along the line rV-rV in FIG. 3, and FIG.
6 is a perspective view showing the loading platform, FIG. 7 is a side view showing the muffler installed, and FIG. 8 is a side view showing the battery installed. 1...Vehicle frame, IC...Seat rail,
6... Seat, 8... Rear wheel, lO... Loading platform, 11... Frame, 15... Floor plate, 25...
Buffer, 29... Rear wheel axle, C... Center line. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Claims] In an off-road vehicle in which a saddle-shaped seat is provided in the center of the vehicle body and left and right rear wheels are suspended by an axle, a pair of left and right frame members is provided extending rearward from the seat, and both left and right rear wheels are mounted on the frame members. A loading platform having a floor plate that integrally covers the upper part of the wheels is supported so that its center in the longitudinal direction is located forward of the axis of the rear wheel axle, and a pair of left and right buffers are provided between the frame member and the rear wheel axle support member. A vehicle for traveling on rough terrain, in which a shock absorber is installed, and the upper end of the shock absorber is pivoted near the longitudinal center of a loading platform.