JPH0742944Y2 - Wheel suspension system for saddle type vehicle for running on rough terrain - Google Patents

Description

[Detailed Description of the Invention] a. Industrial field of application The present invention relates to a saddle-ride type vehicle that employs a rear wheel independent suspension system, and is a wheel of a saddle-ride type vehicle for running on uneven terrain that can reduce camber changes in the rear suspension. Suspension device.

b. Conventional Technology Vehicles used for running on rough terrain are required to be well balanced and easy to ride when the driver is on board and runs. Therefore, a straddle-type four-wheeled vehicle has been developed in which two wheels are provided on the front and rear wheels of a two-wheeled type saddle-type frame.

Various types of saddle riding type four-wheeled vehicles have been developed, and the basic structure common to them is as follows.

That is, a saddle-ride type four-wheeled vehicle of this type is provided with two front wheels and two rear wheels on a body frame, and each of these wheels has a low internal pressure and a wide contact surface with the ground, a so-called balloon tire. Is installed. In addition, this four-wheeled vehicle uses a bar handle as a handle for operating the steering mechanism of the front wheels, and steps for placing the driver's foot are provided on both sides of the vehicle body.

As the suspension system for the wheels, the rigid type was initially adopted, but after that, improvements were made to adopt the wishbon type suspension for the front wheels and the axle type suspension for the rear wheels.

c. Problems to be Solved by the Invention However, when such an axle type suspension is adopted for the rear wheels of a saddle-ride type vehicle for running on uneven terrain, one wheel on one of the wheels climbs on a stone when traveling on an uneven terrain. In this case, the vehicle body leans to the left and right, and it tends to lack running stability.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wheel suspension device for a saddle-ride type vehicle for rough terrain traveling, which can solve the above-mentioned problems, reduce the camber change of the rear suspension, and improve the riding performance and traveling stability. And

d. Means for Solving the Problems In order to solve the above problems, the present invention adopts a rear swing 5 of a diagonal swing axle system for the rear wheels, and uses the front arm 15a of the suspension arm 15 of the rear suspension 5 for the rear wheels. The rear arm 15 of the suspension arm 15 is swingably mounted on a part of the vehicle body frame 1 located on the front side and below the center of 4.
b is swingably attached to a part of the body frame 1 located rearward and above the center of the rear wheel 4, and the front arm 15a and the rear arm 1 of the left and right suspension arms 15 are mounted.
The front arm 15a and the rear arm 15b are pivotally supported so that a line X connecting the center lines of the swing shafts of 5b spreads to the left and right in plan view, and the center line of the swing shafts. Line X connecting
However, it is configured such that it passes through the vehicle body center side Y from the output shaft side joint center O of the drive shaft that transmits the power of the output shaft to the wheel shaft of the rear wheel 4.

e. Embodiment Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment applied to a saddle type four-wheeled vehicle.

1 to 4 show a wheel suspension system for a four-wheeled saddle type vehicle, FIG. 1 is a side view, FIG. 2 is a plan view of the lower tube side of FIG. 1, and FIG. FIG. 1 is a partial sectional front view showing the front suspension of FIG. 1, and FIG. 4 is a partial sectional rear view showing the rear suspension of FIG. Figure 5 shows
1 is a perspective view showing a four-wheeled saddle type vehicle to which a wheel suspension device of the present invention is applied.

In FIGS. 1 to 5, reference numeral 1 is a vehicle body frame of a saddle-ride type four-wheeled vehicle that employs a double wishbon type front suspension 3 for a front wheel 2 and a diagonal swing axle type rear suspension 5 for a rear wheel 4. The vehicle body frame 1 has a box type structure in which a pair of upper tubes 6 and lower tubes 7 are connected by a plurality of connecting pipes, and a long engine 8 is mounted in a central space.

The pair of upper tubes 6 is the steering shaft support 9
The tip portion 6a of the portion that supports is once tilted in the front lower direction and in a direction away from each other, and approximately directly below from the middle thereof,
And bend them toward each other and connect both
To form a front portion 11. Further, the upper tube 6 forms a seat rail portion 6b for mounting the seat 12 by inclining the rear portion of the steering shaft support portion 9 obliquely downward to the middle and inclining the rear portion thereof obliquely upward. 13 ₁ is a front carrier and 13 _{2 a} rear carrier.

On the other hand, the pair of lower tubes 7 are connected to the front part 11 of the upper tube 6 by inclining the tip end portion 7a obliquely upward, and are connected to the rear end portion 7b by the connection pipe 14. Further, the lower tube 7 is formed such that a portion 7c for supporting a front arm 15a of a suspension arm 15 of a rear suspension 5 described later is in the same direction as the swing axis X of the suspension arm 15. Reference numeral 16 is a connecting pipe that connects the tip portion 7a of the lower tube 7 and the tip of the upper tube 6.

Reference numeral 17 denotes a connecting pipe 14 connecting the rear ends of the lower tubes 7 and a pair of connecting pipes connecting the rear ends of the upper tubes 6. The pair of connecting pipes 17 is connected to the rear arm 15 of the suspension arm 15 of the rear suspension 5.
The portion 17a that supports b is formed so as to be curved toward each other so that its width is narrower than that of the portion 7c that supports the front arm 15a of the suspension arm 15 of the rear suspension 5. In the embodiment, the mutual connecting pipes 17 are
The parts 17a supporting the rear arm 15b of the suspension arm 15 of the rear suspension 5 are in close contact with each other.
A portion 7c of the upper tube 7 that swingably supports the front end portion of the front arm 15a of the suspension arm 15.
Further, support fittings 18 and 19 are attached to the portion 17a that swingably supports the tip end portion of the rear arm 15b of the suspension arm 15.

The rear suspension 5 is a so-called diagonal swing axle type suspension, and a shock absorber 21 is arranged between the reinforcing pipe 20 and the upper tube 6. The wheel shafts 23 of the rear wheels 4 are separately supported by the wheel shaft support pipes 22 of the rear suspension 5, and the wheel shafts 23 and the output shafts 24 from the engine 8 are connected via universal joints 25 and 26, respectively. Drive shaft 27 is connected.

The front arm 15a of the suspension arm 15 of the rear suspension 5 is swingably attached to a part of the vehicle body frame 1 located in front of and below the center of the rear wheel 4 via a support metal fitting 18 and the suspension arm 15 The rear arm 15b is swingably attached to a part 17a of the vehicle body frame 1 located rearward of and above the center of the rear wheel 4 via a support fitting 19, and the left and right suspension arms
The front arm 15a and the rear arm 15b are pivotally supported so that the line X connecting the center lines of the swing shafts of the front arm 15a and the rear arm 15b of 15 spreads to the left and right in the plan view.
Further, the line X connecting the center lines of the swing shafts is configured so as to pass from the output shaft side joint center O of the drive shaft that transmits the power of the output shaft to the wheel shaft 23 of the rear wheel 4 to the vehicle body center side Y. ing.

On the other hand, the front suspension 3 has an upper arm 28
Also, the lower arm 29 is swingably supported by the support member 30 attached to the front portion 11 of the upper tube 6, the tip end portion 7a of the lower tube 7 and the connecting pipe 16. A shock absorber 31 is provided between the upper tube 6 and the lower arm 29 and suspends the front wheel 2.

The power of the engine 8 is transmitted to the front wheels 2 via a power transmission shaft 31, and the front wheels 2 are steered via a steering shaft 33 steered by a handle 32 and a link mechanism (not shown).

In the wheel suspension device for the saddle-type four-wheeled vehicle, since it is a four-wheel independent suspension, it can freely follow the unevenness of uneven terrain,
It is possible to improve running stability. Since the rear arm 15b of the suspension arm 15 of the rear suspension 5 is supported behind the center of the rear wheel, the suspension arm can be made longer than that of a normal diagonal swing axle type suspension. In particular, since the rear arm 15b can be extended to near the center of the vehicle body by bringing the portions 17a of the vehicle body frame 1 supporting the rear arm 15b of the suspension arm 15 close to each other, the rear arm 15b should be made that much longer. You can On the other hand, by mounting the front arm 15a on the front side of the vehicle body frame 1, it is possible to increase the length of the front arm 15a and reduce the camber change on rough terrain. In particular, the front arm 15a and the rear arm 15a and the rear arm 15a and the rear arm 15b are arranged so that the line X connecting the center lines of the swing axes of the front arm 15a and the rear arm 15b spreads to the front in the left and right directions in plan view. Since the line X that supports 15b and connects the center line of the swing shaft passes from the joint center O that transmits the power of the drive shaft to the wheel shaft of the rear wheel 4 to the vehicle body center side Y, Since the wheel stroke can be lengthened, it is possible to reduce the change in camber and to improve the riding comfort and the traveling stability. Also suspension arm
Since the fulcrum widths of the front arm 15a and the rear arm 15b of 15 are wide, the strength is excellent and the weight can be reduced.

f. Effect of the Invention According to the wheel suspension system for a saddle-ride type vehicle for traveling on uneven terrain of the present invention, a rear swing wheel adopts a diagonal swing axle type suspension, and the front arm 15a of the suspension arm 15 of the rear suspension 5 is adopted. The suspension arm 15 is swingably mounted on a part of the body frame 1 located on the front side and below the center of the rear wheel 4.
The rear arm 15b is swingably attached to a part of the body frame 1 located rearward of and above the center of the rear wheel 4, and the front arm 15a of the left and right suspension arms 15 is mounted.
And a line X connecting the center lines of the swing axes of the rear arms 15b,
A line X that pivotally supports the front arm 15a and the rear arm 15b and that connects the center lines of the swing shafts is driven to the wheel shaft of the rear wheel 4 so as to spread to the left and right in the plan view. Since the wheel stroke is longer than the joint center O that transmits the power of the shaft, the wheel stroke can be made longer. Therefore, the camber change can be reduced, and the riding comfort and the traveling stability can be improved. You can Further, since the fulcrum width of the front arm 15a and the rear arm 15b of the suspension arm 15 is wide, the strength is excellent and the weight can be reduced.

[Brief description of drawings]

1 to 4 show an embodiment of a wheel suspension device for a saddle-ride type vehicle for traveling on rough terrain according to the present invention, and FIG. 1 is a side view,
2 is a plan view of the lower tube side of FIG. 1, and FIG.
1 is a partial sectional front view showing the front suspension shown in FIG. 1, and FIG. 4 is a partial sectional rear view showing the rear suspension shown in FIG. FIG. 5 is a perspective view showing a four-wheeled saddle type vehicle to which the wheel suspension system of the present invention is applied. 1 ... Body frame, 2 ... Front wheel, 3 ... Front suspension, 4 ... Rear wheel, 5 ... Rear suspension, 6 ... Upper tube, 7 ... Lower tube,
8 ... Engine, 15 ... Suspension arm, 15a ...
… Front arm, 15b …… Rear arm, 17 …… Coupling pipe, 18,19 …… Supporting metal fitting, 21 …… Shock absorber, 2
2 …… Wheel shaft support pipe, 23 …… Wheel shaft, 24 …… Output shaft, 25,26 …… Universal joint, 27 …… Drive shaft.

Claims (1)

[Scope of utility model registration request] 1. A rear swing 5 of a diagonal swing axle system is adopted for a rear wheel, and a front side arm 15 of a rear suspension arm 15 of the rear suspension 5 is adopted.
a is mounted swingably on a part of the body frame 1 located below the center of the rear wheel 4 and below, and the rear arm 15b of the suspension arm 15 is located behind the center of the rear wheel 4, and It is swingably attached to a part of the body frame 1 located above, and the left and right suspension arms 15
The front arm 15a and the rear arm 15b are pivotally supported so that the line X connecting the center lines of the swing shafts of the front arm 15a and the rear arm 15b spreads to the left and right in the plan view, and The line X connecting the center lines of the swing shafts is the output shaft side joint center O of the drive shaft for transmitting the power of the output shaft to the wheel shaft of the rear wheel 4.
A wheel suspension device for a saddle-ride type vehicle for traveling on rough terrain, characterized by being configured so as to pass through the body center side Y more.