JP2610876B2 - How to install automotive tires - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of mounting a tire having a different optimal tread pattern on each wheel of an automobile.

[Conventional technology]

Conventionally, the same tread pattern tire is mounted on all four or six wheels of an automobile. The tread pattern is almost 180 degrees, as shown in the footprint of FIG.
線 A tire is used that has a line-symmetrical shape that does not change its tread pattern even when it is reversed, and has no direction in the direction of mounting on the rim, and is partially used as shown in the footprint in FIG.
It is symmetrical with respect to the center plane of the tire.
Directional tires with a specified direction of mounting on the rim are also used.

In the case of FIG. 3, the same tire is used for all four wheels, but when mounted on the rim, the right and left wheels are turned upside down.

[Problems to be solved by the invention]

For example, in the case of a four-wheeled vehicle, driving wheels and rolling wheels (driven wheels)
Receives forces in different directions from the ground during acceleration, at constant speed, and during braking. That is, the driving wheel receives a forward force F from the ground on the contact surface of the tire (5) during acceleration or running at a constant speed as shown in FIG. 4a, and a rearward force as shown in FIG. Receives force F '. On the other hand, the rolling wheels always receive a backward force from the ground during running and braking.

When the vehicle turns, the tire receives a lateral centripetal force F toward the turning center as shown in FIG. 4c as a reaction of the centrifugal force accompanying the turning. The force acting on the ground contact surface of the tire is the resultant of the centripetal force and the braking force or the driving force.

When turning, it is a common driving method to turn the steering wheel while driving the drive wheels, so in order to improve the steering performance of the car, when turning while driving the drive wheels, the grip performance is high. It is desirable to wear tires. However, since the directions of the forces applied to the ground contact surfaces of the four tires at the time of the above-mentioned turning are different from each other, the tread patterns of the optimum tires for maximizing the grip performance of the four tires are also different from each other. Optimal conditions cannot be obtained if the same tires are used.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method of mounting a tire having an optimum tread pattern on each wheel of an automobile to enhance the steering performance of the automobile.

[Means for solving the problem]

As described above, the grip performance of each tire when turning while driving the driving wheels of the automobile is most important. When turning right, the centripetal force of the left tire is dominant, and when turning left, the centripetal force of the right tire is dominant.Therefore, the right driving wheel has a left-front force, the left driving wheel has a right-front force,
For the right rolling wheel, the grip performance when the right rearward force is applied is the most important for the left rolling wheel, and for the left rolling wheel,
It is good to mount tires with the best tread pattern to increase their grip performance.

For example, in the case of a rear-wheel drive four-wheeled vehicle, it is preferable to mount tread-shaped tires such that the grip force increases when a force is applied in the direction shown in FIG.

When the tire receives a diagonal force from the ground in the horizontal direction as shown in FIG. 6 as a combined force of a driving force or a braking force and a centripetal force, the block (1) surrounded by the tread groove of the tread of the tire. ) Has a shape that extends in the direction of the resultant force F as shown in FIG. 6, the block (1) is less likely to be deformed by the horizontal force F, the grip force is increased, and the maneuverability of the tire is enhanced.

For this purpose, as shown in FIG. 7, the tread pattern of the tire is changed by several main grooves (2) parallel to the circumferential direction of the tire.
A tire having a sub-groove (3) formed of substantially straight lines or gentle curves parallel to each other and obliquely intersecting with the tire;
Prepare a pair of tires with treads that are opposite to each other in the diagonal direction of the sub-groove, and the driving wheels have the sub-groove from the inside front of the rim to the outside rear of the rim at the ground contact surface. In this way, it is preferable that the sub wheels are disposed and mounted on the rolling wheels such that the sub-grooves face the ground contact surface from the front outside the rim toward the rear inside the rim.

That is, for a rear-wheel drive vehicle, it is mounted as shown in the footprint of FIG. 1a, for a front-wheel drive vehicle, it is mounted as shown in FIG. 1b, and for a four-wheel drive vehicle, it is mounted as shown in FIG. 1c. I do.

The tread pattern of the tire used in the present invention is such that the sub-grooves are loosely curved approximately linearly or slightly S-shaped from one tread end (4) to the other tread end (4) 'of the tread of the tire. The sub-grooves having the same shape are arranged in parallel at substantially constant intervals. The interval between the sub-grooves is made smaller than the interval between the main grooves, and the shape of the block (1) formed by being surrounded by the main groove (2) and the sub-groove (3) is desirably an approximately parallelogram elongated in the oblique direction. .

By forming the block in this manner, as shown in FIG. 6, the resultant force F acts in the longitudinal direction of the block (1), thereby increasing the rigidity of the block.

〔Example〕

A tire was mounted on a rear wheel drive vehicle according to the present invention as shown in FIG. 1a, and a running test was conducted. For comparison, the same tire having the conventional non-directional tread pattern shown in FIG. 2 was mounted on four wheels, and the same tire having the conventional directional tread pattern shown in FIG. The test was also performed when the four wheels were mounted in the same direction.

All tire sizes were 225 / 50VR16, and tires of the same structure differed only in the tread pattern. The tire pressure was 2.0 kg / cm ² , the rim used was 16 × 7J, and the vehicle used for the test was a rear-wheel drive vehicle.

In the test, a test driver traveled on a dry road surface and a wet road surface, and evaluated straight running stability, turning performance, and lane change performance. Table 1 shows the results. These results
The test driver sensuously scored each item, and the result was expressed as an index with the result of the conventional non-directional tire shown in FIG.

Tests were also conducted on high-speed durability, rolling resistance, and riding comfort, but no difference was observed between the above three types of tires.

Further, Table 1 shows an exponential limit speed when a pylon is installed on a wet road surface at intervals of 35 m and the vehicle runs slalom.

As shown in Table 1, the test results of the tire mounting method of the present invention on both the dry road surface and the wet road surface were considerably superior to those of Comparative Example 1 in which a conventional general non-directional tire was mounted. The results are shown, and when the present invention is compared with the one equipped with the conventional directional tire of Comparative Example 2, the same performance is shown on a wet road surface, but the result of the present invention is better on a dry road surface.

[Effects of the Invention] According to the method for mounting a vehicle tire of the present invention, the steering performance of the vehicle on a dry road surface and a wet road surface, such as straight running stability, turning performance and lane change performance, is improved.

[Brief description of the drawings]

FIG. 1 is a footprint showing the arrangement of tires according to the method of mounting an automobile tire according to the present invention, wherein a is a rear wheel drive vehicle, b is a front wheel drive vehicle, and c is a case of a four wheel drive vehicle. FIG. 2 is a footprint of a four-wheel tire of an automobile equipped with a conventional non-directional tire, FIG. 3 is a footprint of a four-wheel tire of an automobile equipped with a conventional directional tire, and FIG. FIG. 5 is an explanatory diagram of the force received by the tire from the ground at the time of braking, turning, and turning. FIG. 5 is an explanatory diagram of the force received when each tire of the rear wheel drive vehicle is positioned outside the turning during acceleration turning. FIG. 3 is a conceptual diagram of a horizontal force received from the ground by the ground contact surface of FIG. FIG. 7 is a developed view of an example of a tread pattern of a tire used in the present invention. (1) Block, (2) Main groove, (3) Sub groove, (4), (4) '... Grounding end, (5) Tire.

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-157817 (JP, A) JP-A-63-61607 (JP, A) JP-A-61-98601 (JP, A)

Claims (6)

(57) [Claims] 1. A plurality of linear main grooves parallel to the circumferential direction and substantially linear or slightly curved curved lines intersecting obliquely with respect to the main grooves are arranged in parallel at substantially constant intervals. A tire having a plurality of sub-grooves, wherein the two sub-grooves have opposite diagonal directions and are symmetrical to each other in a diagonal direction. At the ground contact surface, it is attached so that it faces from the inside front of the rim to the outside rear,
In the case where the vehicle has rolling wheels, a vehicle in which the pair of two types of tires are mounted on a pair of rolling wheels such that the sub-groove faces from the front outside the rim to the rear inside the rim on the ground contact surface. Tire mounting method. 2. The method of claim 1, wherein the vehicle is a rear-wheel drive vehicle. 3. The method according to claim 1, wherein the vehicle is a front-wheel drive vehicle. 4. The vehicle is a four-wheel drive vehicle, and the pair of tires are respectively directed to a pair of front wheels and a pair of rear wheels. 2. The method for mounting a tire for an automobile according to claim 1, wherein the mounting method is as follows. 5. The method according to claim 1, wherein a tire having a distance between said sub-grooves smaller than a distance between said main grooves is used. 6. The method of claim 1, wherein the sub-groove is a sub-groove continuous from one ground contact end of the tire tread to the other ground contact end.