JPS6144083A - Travelling device for balloon tire car - 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 running device for a balloon tire vehicle, and in particular to the arrangement of tires thereof.

b. Prior Art Among branch type four-wheeled vehicles that are vehicles for traveling in wilderness or mountainous areas, some are equipped with balloon tires (these are called balloon tire vehicles).

FIG. 1 is a perspective view showing the frame and balloon tire of a balloon tire vehicle.

The balloon tire vehicle shown in FIG. 1 is a four-wheel vehicle with rear wheel drive and front wheel steering. Due to its purpose, this balloon tire vehicle is required to be lightweight and structurally simple.

Furthermore, since the balloon tire itself has impact force absorption properties, the rear wheel suspension system has a relatively simple structure.

2 is a side view conceptually showing the frame and tire of FIG. 1. FIG.

A rear wheel 1 is rotatably attached to a swing arm 2 with an axle 3. The swing arm 2 is attached to the vehicle body frame 4 so as to be rotatable in the vertical direction about a rotation shaft 5. The swing arm 2 consists of two arms, one for the right rear wheel and one for the left rear wheel, and one bridging member 6 that bridges the two arms, and the bridging member 6 and the vehicle body frame. 4 are connected by a suspension system.

As a result, the right rear wheel and the left rear wheel move in conjunction with each other to rotate about the rotation axis 5. In other words, the left and right rear wheels cannot move up and down independently.

However, as mentioned above, since the balloon tire itself has impact force absorbing properties, no problem occurs during normal driving. At this time, the larger the balloon tire is, the more effective the impact force absorption ability of the balloon tire is, so it is preferable for the balloon tire to have a larger diameter and tire width. Therefore, wide balloon tires are used for balloon tire vehicles. For the above reasons and in consideration of ease of steering, balloon tire vehicles are designed to have wide rear wheels.

C1 Problems to be Solved by the Invention FIG. 3 is a plan view showing the arrangement of tires when a balloon tire vehicle according to the prior art is traveling in the direction of the arrow on a mountain road between cliffs on the mountain side and the valley side. FIG. 4 is an elevational view of the arrangement shown in FIG. 3, viewed from the rear of the vehicle.

When driving on such mountain roads, the cliffs on the valley side are dangerous, so drivers tend to drive close to the cliffs on the mountain side.

In such a case, as shown in FIGS. 3 and 4, the rear wheel l may come into contact with the lower end of the mountain cliff. If they come into contact, not only will the sides of the balloon tire 1 be hit by the rod structure, but an external force will be applied to the vehicle from the side, causing the vehicle to swing and become unstable.

Figure 3 shows 1 due to contact between the tire and the cliff on the mountain side.
This shows that a zero external force in the lateral direction acts and a moment M8 is generated around the vertical axis passing through the center of gravity. Figure 4 shows the moment M around the longitudinal axis passing through the center of gravity due to the same external force.
This shows that this occurs.

FIG. 5 is a plan view showing the arrangement of tires of a balloon tire vehicle traveling in the direction of an arrow in a field with rough terrain.

When the rear tire 1 runs onto a large stone or stump 7 on the field, there is a limit to the ability of the balloon tire to absorb the impact force, and the suspension system of the rear wheel is shown in Figure 1.

As shown in FIG. 2, the rear part of the balloon vehicle swings significantly up and down or left and right.

In order to avoid such rocking, it is sufficient to prevent the tire from coming into contact with the lower end of the valley on the mountain side, large stones, or stumps. However, the front wheels of the balloon vehicle can be visually checked to prevent them from coming into contact with the above obstacles.
As for the rear wheels, they tend to touch.

An object of the present invention is to provide a traveling device for a balloon vehicle that allows the outer side of the rear wheels to also pass without contacting obstacles when the front wheels are maneuvered so as to pass through the obstacles without contacting them.

Means for Solving the d1 Problem The above-mentioned problem of the present invention was solved by making the full width of the front wheel, that is, the distance between both outer side surfaces of the tire, narrower than the full width of the rear wheel.

FIG. 6 is a conceptual plan view showing an example of tire arrangement according to the present invention. Here, the forward direction of the vehicle is indicated by an arrow.

The above conditions can be expressed as follows using the tread width of the wheel and the width of the tire.

As shown in Figure 6, the total width of the front wheels 8 and 9 is W2, the tire width is Br, and the tread width is T, the total width of the rear wheels 10°11 is Wf, the tire width is bf, and the trend width is 1. do.

Wt = Tt +Br Wf Tomi t, +b.

Since W(> wf, Ty + Br > jr + by In other words, the above condition is satisfied when the sum of the trend width of the rear wheels and the width of the rear tires is smaller than the sum of the tread width of the front wheels and the width of the front tires. be satisfied.

Effects of the C0 invention The total width of the front wheels is wider than the total width of the rear wheels, so when you discover an obstacle in front of you, if you maneuver so that the front wheels do not come in contact with the obstacle, the rear tires will move as long as you are moving in a straight line. The outside of the vehicle will not touch the obstacle. That is, if the front wheels can pass, the rear wheels can also pass.

Furthermore, the overall width of the rear wheels is narrow, so there is little difference in path between the left and right wheels, and the amount of slippage is small. Therefore, even a balloon tire vehicle d which is not normally equipped with a differential device can easily turn.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the frame and balloon tire of a balloon tire vehicle, Fig. 2 is a side view conceptually showing the frame and tire in Fig. 1, and Fig. 3 is a conventional balloon tire vehicle with mountain sides and valleys. A plan view showing the arrangement of tires when driving in the direction of the arrow on a mountain road between side cliffs, Figure 4 is an elevation view of the arrangement shown in Figure 3 seen from the rear of the car, and Figure 5 is FIG. 6 is a conceptual plan view showing an example of the tire arrangement according to the present invention. Figure 1

Claims (1)

[Claims] A balloon tire vehicle equipped with a balloon tire supported by a swing arm rotatably fixed to a vehicle body frame at a lateral horizontal rotation axis at the rear of the vehicle, characterized in that the total width of the rear wheels is narrower than the total width of the front wheels. Balloon tire vehicle running device.