JPS598502A - Car for use of all configuration of the ground - Google Patents

Abstract

PURPOSE:To improve driving stability of a car, comfortableness to ride in the car and its durability or the like, by mounting a cross ply tire improving ply arrangement further a radial tire having specific constitution respectively to front and rear wheels in the car for use of all configuration of the ground. CONSTITUTION:A radial tire 2 used for a rear wheel of an all configuration ground use car is constituted by a pair of left and right bead wires 4, toroidal carcass 5, whose both ends are stopped to the bead wire, belt layer 6 arranged to a crown part in the outside of the carcass 5, and a tread rubber 7 arranged to the outside of the belt layer 6. Then the carcass 5 is formed such that monofilaments are parallelly arranged mutually at an angle of 75-95 deg. with respect to an equatorial surface of the tire. On the other hand, a cross ply tire 10 used for a front wheel is formed by at least two layers of plies, in which a cord consisting of an organic fiber is arranged at an angle of 45-85 deg. with respect to the center surface in the peripheral direction of the tire, and both ends 13 of the carcass are stopped to be ended in the vicinity of a rim flange 15 by winding bead wires 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a vehicle suitable for traveling on any terrain such as sand, rough roads scattered with rocks, etc., that is, an all-terrain vehicle. It relates to all-terrain errands that improve durability, running stability, handling stability, vibration, and ride comfort by installing radial tires with a specific configuration.

All-terrain vehicles are usually equipped with one front wheel and two rear wheels, providing stability, handling stability, and durability even when driving on rough roads.
It is desired that various performances such as ride comfort be satisfied. It is said that these performances are largely due to the contribution of the tire structure, and as a result of research into the specific uses and structure of subordinate tires, we found that they are different from ordinary four-wheeled vehicles or two-wheeled vehicles. It has been found that the functions required of tires, especially the division of functions between the front wheels and the rear wheels, are different, and that the above-mentioned performances can be greatly varied by selecting a combination of the structures of the tires installed next to the front wheels and the rear wheels. For example, among the above characteristics, regarding steering stability, it is effective to increase the cornering power and lateral rigidity of the front tires compared to the rear tires. It is preferable to use radial tires for the wheels.

However, because all-terrain vehicles travel on rough roads at relatively low speeds and with low loads, and the driving conditions are completely different from those of regular four-wheeled vehicles and two-wheeled vehicles, they do not use regular cross-ply tires or radial tires. However, satisfactory performance cannot be obtained. Therefore, the old and ignorant person studied various front and rear tire structures and combinations that would satisfy the above-mentioned required characteristics under the driving conditions of an all-terrain vehicle, that is, when driving on rough roads at relatively low speeds and with low loads. As a result, we found that by combining a cross-ply tire with a specific structure on the front wheel and a radial tire with a specific structure on the rear wheel, we could satisfy characteristics such as durability, ride comfort, driving stability, and handling stability. Completed the invention.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a radial tire (2) used for the rear wheel of an all-terrain vehicle according to the present invention, mounted on a rim (3).

In the figure, the radial tire (2) ζ also has a pair of left and right bead wires (4), a toroidal carcass (5) with both ends locked to the bead wires (4), and is further arranged in the crown area outside the carcass (5). a belt layer (6), and a tread rubber (7) disposed on the outside of the belt layer (6);
It consists of The carcass (5) usually has a weight of 500~
The 2000 denier monofilament is placed at an angle of 75 to 90° to the equatorial plane of the tire, particularly preferably approximately 90°.
arranged parallel to each other at angles of °. Since monofilament is used here, voids are removed at the interface with the rubber, improving adhesion, and the entire tire (2) can be reinforced while maintaining the excellent flexibility of the hoodless tire.

Further, the number of monofilament implants is selected in the range of 10 to 70 m/115 LM (7) in consideration of the balance between fatigue resistance and strength. Although the belt layer (6) is not necessarily required in the present invention, the use of the belt layer (6) can further improve durability and handling stability.

Here, the belt layer (6) is composed of at least one reinforcing ply having monofilaments or cords arranged at an angle of 75' to 90' with respect to the equatorial plane of the tire.

Generally, the cord angle of the belt layer (6) of a vehicle tire is placed relatively shallowly with respect to the tire's equatorial plane, giving a "hoop effect" to give rigidity to the tire tread and maintain steering stability. However, in a special purpose tire such as the radial tire (2) of the present invention, which is used for driving on rough roads strewn with rocks, etc., the effect of wrapping up undistributed objects such as rocks, or the damage resistance and crack resistance of the tread part is low. nature is the more important required characteristic. Therefore, in the present invention, the monofilament or cord of the belt layer (6) is set at an angle in the range of 75° to 90'' with respect to the equatorial plane (C) of the tire as shown in Figure 2, and the tread part is made flexible. The angle is preferably arranged at about 90° as shown in Figure 2, but if other angles are used, the monofilament of the carcass (5) It is desirable that the belt layer (6) be arranged so as to intersect with each other, thereby relaxing the directionality of the rigidity of the belt layer (6).

Next, the monofilament used for the belt layer (6) is usually in the range of 600 to 3000 are and the number of strokes is 10.
A range of 70 to 15a+ is used. 60
If it is less than 0 denier, the reinforcing effect of the tread part will decrease,
Moreover, if it exceeds 3000 denier, it is not economical from the viewpoint of tire manufacturing cost. In addition, the radial tire (2) according to the present invention has a lower internal pressure than general vehicle tires and has an extremely small number of reinforcing layers, so the radial tire (2) has a large bending deformation when running.
Therefore, higher bending fatigue resistance is required, and therefore the number of strokes must be set in a relatively high range as mentioned above, and in particular, a range of 30 to 5° and 75 m is desirable. Furthermore, the cord used for the belt layer (6) is constructed by twisting together several of the monofilaments described above, and the number of twists in this case is selected within approximately the same range as the monofilaments.

The monofilament used for the carcass (5) and belt layer (6) is nylon, polyester, rayon,
A radial tire (2) constructed in this manner and made of a material such as aromatic polyamide has only a carcass (5) made of monofilament or a belt layer (6) and bead wires (4) in addition to rubber. Therefore, it has the excellent flexibility, damage resistance, and durability of a cordless tire, and has a relatively simple structure, so the manufacturing process and labor can be significantly reduced compared to general vehicle tires. There are advantages.

Next, FIG. 3 shows the front wheel rim (9) of the all-terrain vehicle of the present invention.
2 shows a cross-sectional view of the cross-bright tire 0 installed. In the figure, carcass 0 of cross bly tire OG
2 consists of at least two plies in which cords made of organic fibers are arranged at an angle of 20 to 60 degrees with respect to the center plane in the circumferential direction of the tire, and the cords are arranged so as to intersect with each other; It constitutes a so-called crossbrie.

Chapter 1 Table Note 1 Relative values are shown based on Tire A.

The higher the value, the better.

Table 2 Note 2) This was a feeling test using actual vehicle driving, and a 5-level evaluation method was adopted.

Therefore, the all-terrain vehicle of the present invention has the above-mentioned radial tire (
2) Or, it is characterized in that a semi-radial tire is used for the rear wheel and the cross-ply tire Oe is used for the front wheel, and the lateral rigidity of the front cross-ply tire OG is equal to that of the radial tire (2) for the rear wheel. Relatively higher than rigidity,
Excellent handling stability, ride comfort, and durability - Tire size 22 x 11.
The lateral stiffness of 00-8 was measured and shown in the same table. In addition, actual vehicle running tests were conducted on a 125CC three-wheeled vehicle with Tire A installed on the front and rear wheels, Tire C installed on the front wheel, and Tire A or B installed on the rear wheel, and the results were reported in this article.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a radial tire used as a rear tire, FIG. 2 is a partially enlarged view of a breaker thereof, and FIG. 3 is a cross-sectional view of a cross-ply tire used as a front tire. (2)...Radial tire, (3)...Rim (4)...
... Bead wire, (5) ... Carcass (1 ■ ...
Cross ply tire, 02... carcass (+4+...
・Bead wire patent applicant Sumitomo Rubber Industries Co., Ltd. Agent Patent attorney Tadashi Naemura Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) The organic fiber cord is composed of at least two plies arranged at an angle of 45 to 85 degrees with respect to the circumferential center of the tire, and the plies intersect with each other, and both ends thereof are formed by a pair of bead wires. A cross-bly tire with a folded carcass is attached to the front wheel, while a toroidal carcass consisting of at least one reinforcing ply in which monofilaments are arranged at 75 to 90 degrees to the tire's equatorial plane and both ends of which are secured to bead wires. All-terrain errand featuring a visible radial tire mounted on the rear wheel.