JP2000249628A - Method and apparatus for evaluating hydroplaining resistance performance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a measuring accuracy of a hydroplaining resistance performance and safety when measured by coupling a driven vehicle mounting test tires to a self-propelled vehicle, traveling test tires of the driven vehicle on a wet road aligned with a non-wet road while traveling the self-propelled vehicle on the non-wet road, and evaluating hydroplaining of the test tire. SOLUTION: In the apparatus for evaluating hydroplaining resistance performance, a wet road 1 and a non-wet road 2 are aligned in parallel. Test tires 4 are mounted at a driven vehicle 5, and coupled to a rear portion of a self-propelled vehicle 3 through arms 3a and hinges 3b. The vehicle 5 is towed while traveling the vehicle 3 along the road 2, and the tires 4 are traveled by following to the road 1. When its speed is accelerated, the tires 4 causes hydroplaining at a certain speed. The hydroplaining may be evaluated by observing tread surfaces of the tires 4, or executed by measuring a difference between traveling speed (circumferential speed of the tire) of the vehicle 3 and the circumferential speeds of the tires 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for evaluating hydroplaning resistance, and more particularly, to an evaluation of hydroplaning resistance, which improves measurement accuracy of hydroplaning resistance and improves measurement safety. Method and apparatus.

[0002]

2. Description of the Related Art Conventionally, as a method of evaluating the anti-hydroplaning performance of a tire, a test tire is mounted on an actual vehicle (such as a passenger car) and travels on a wet road with a water depth of about 10 mm. This is done by observing or measuring the hydroplaning phenomenon that occurs.

However, since the actual vehicle travels directly on a wet road, when the hydroplaning phenomenon occurs, the traveling direction of the vehicle itself becomes unstable, and there is a problem that measurement data tends to vary. In addition, great care had to be taken to ensure safety.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus for evaluating hydroplaning resistance, which improve the measurement accuracy of hydroplaning resistance and improve safety during measurement.

[0005]

Means for Solving the Problems To solve the above problems, a method for evaluating hydroplaning performance according to the present invention comprises connecting a driven vehicle equipped with test tires to a self-propelled vehicle, and connecting the self-propelled vehicle to a non-wet road. While running, the test tire of the follower vehicle is run on a wet road juxtaposed to the non-wet road, and the hydroplaning of the test tire is evaluated.

The hydroplaning resistance evaluation apparatus of the present invention is provided with a self-propelled vehicle having a wet road connected to a non-wet road and connected to a driven vehicle equipped with test tires. Driving a car on the non-wet road,
The test tire of the following vehicle is configured to run on the wet road.

According to the present invention, the wet road and the non-wet road are arranged side by side, and the self-propelled vehicle runs on the non-wet road while running only the test tires of the driven vehicle on the wet road. The running vehicle itself can measure only the hydroplaning phenomenon occurring in the test tire without being directly affected by the hydroplaning phenomenon. Therefore, the traveling direction of the self-propelled vehicle can be stabilized, and variations in the measurement data can be eliminated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of an apparatus for implementing the method for evaluating hydroplaning resistance according to the present invention. This hydroplaning-resistant performance evaluation device includes:
A wet road 1 and a non-wet road 2 are provided side by side.

The wet road 1 is a road with a water depth of about 10 mm. On the other hand, the non-wet road 2
Completely dry path without water, or no water depth even if wet with water, or very little effect of water depth,
A road that is not substantially affected by water depth.

On the other hand, a passenger car is installed as the self-propelled vehicle 3,
The driven vehicle 5 is connected to the self-propelled vehicle 3, and the test tire 4 is mounted on the driven vehicle 5. The follower vehicle 5 is connected to a rear portion of the vehicle 3 via an arm 3a and a hinge 3b.
In addition to the test tire 4, an auxiliary tire 8 for stabilizing the vehicle body is rotatably mounted on the driven vehicle 5 on the opposite side of the test tire 4.

Using the above-described apparatus, the hydroplaning resistance evaluation method of the present invention is carried out as follows. The self-propelled vehicle 3 is arranged to run on the non-wet road 2, while the follower vehicle 5 is arranged so that the test tire 4 is placed in the wet road 1 and the auxiliary tire 8 is placed in the non-wet road 2. I do. Under such a setting, the traveling vehicle 5 is towed while the self-propelled vehicle 3 is traveling along the non-wet road 2, and the test tire 4 is caused to follow the wet road 1.
When the running speed increases, the test tire 4 generates a hydroplaning phenomenon at a certain speed. The evaluation of the hydroplaning may be performed by observing the tread surface of the test tire 4 or measuring the difference between the traveling speed of the self-propelled vehicle 3 (the peripheral speed of the tire) and the peripheral speed of the test tire 4. .

As described above, according to the method for evaluating the hydroplaning resistance of the present invention, the self-propelled vehicle 3 is mounted on the non-wet road 2.
While traveling, only the test tire 4 of the follower vehicle 5 travels on the wet road 1, so that the traveling direction of the self-propelled vehicle 3 is stable without causing the hydroplaning phenomenon,
The measurement can be performed by causing the hydroplaning phenomenon only in the test tire 4. Therefore, the measurement data of the hydroplaning phenomenon does not vary, and the measurement accuracy can be improved. In addition, since the traveling direction is stable, safety can be ensured.

Further, in the case of the embodiment shown in FIG. 1, the follower vehicle 5 is connected so as to be offset from the center of the lateral width direction of the self-propelled vehicle 3 to the wet road 1 side. Thus, the test tire 4 can run on the wet road 1.

FIG. 2 shows an apparatus for evaluating hydroplaning resistance performance according to another embodiment of the present invention. In this device, a hinge 3b is provided in the center of the rear part of the self-propelled vehicle 3, and the large driven vehicle 5 is connected so that the center of the lateral width is aligned.
Even in such a connection, the test tire 4 can be arranged in the wet road 1 because the follower vehicle 5 is large.

FIG. 3 shows still another embodiment. In this device, a sidecar 6 is used as a follower vehicle, and a test tire 4 and an auxiliary tire 8 are mounted on the sidecar 6. The sidecar 6 is connected to the side portion of the self-propelled vehicle 3 by two front and rear movable arms 3c, and is supported so as to be able to travel while maintaining an interval with the self-propelled vehicle 3.

FIG. 4 shows still another embodiment. In this device, a sidecar 7 is connected as a follower vehicle as in the case of FIG. 3, but only the test tire 4 is mounted on this sidecar 7, and no auxiliary tire is provided.
In any of the above-described embodiments, similarly to the case of FIG. 1, the hydroplaning resistance performance can be accurately and safely evaluated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a method of the present invention using a self-propelled car of a passenger car (FR car) and a follower car equipped with test tires, and mounting the same test tire on the front wheels of the same passenger car. The hydroplaning resistance was evaluated by the conventional method of running directly on a wet road.

In both tests, the traveling speed of the passenger car was 9
At a constant speed of 0 km / h, the peripheral speed of each driving wheel and test tire was measured with time, and the results are shown in FIG.

In FIG. 5, A and B are the traveling speed of the passenger car (self-propelled vehicle), the peripheral speed of the test tire, and C, respectively.
And D indicate the traveling speed (peripheral speed of driving wheels) and the peripheral speed of the test tire of a conventional car (FR vehicle), respectively, and T indicates the end point of a wet road. In FIG. 5, the difference between the running speed (the peripheral speed of the driving wheels) and the peripheral speed of the test tire indicates the occurrence of hydroplaning.

As is clear from FIG. 5, in the conventional method, the running speed of the passenger car gradually decreases due to hydroplaning after the start of the measurement, so that the difference between the actual running speed and the peripheral speed of the test tire cannot be easily compared. . On the other hand, in the method of the present invention, since the traveling speed of the passenger car is constant, the difference from the peripheral speed of the test tire is accurate, and highly accurate data can be collected.

[0021]

As described in detail above, according to the present invention, only the test tires of the following vehicle are run on the wet road while the self-propelled vehicle is running on the non-wet road. The hydroplaning phenomenon of the test tire can be accurately measured without being affected by the phenomenon. In addition, since the traveling direction of the self-propelled vehicle is stabilized, it is possible to perform measurement with excellent safety.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a hydroplaning-resistant performance evaluation apparatus of the present invention.

FIG. 2 is a plan view showing another embodiment of the hydroplaning resistance evaluation apparatus of the present invention.

FIG. 3 is a plan view showing still another embodiment of the anti-hydroplaning performance evaluation apparatus of the present invention.

FIG. 4 is a plan view showing still another embodiment of the anti-hydroplaning performance evaluation apparatus of the present invention.

FIG. 5 is a graph showing evaluation results of anti-hydroplaning performance.

[Explanation of symbols]

 Reference Signs List 1 wet road 2 non-wet road 3 self-propelled vehicle (passenger car) 4 test tire 5 follower vehicle

Claims (3)

[Claims] 1. A driven vehicle equipped with a test tire is connected to a self-propelled vehicle, and while the self-propelled vehicle is running on a non-wet road, the test tires of the driven vehicle are arranged side by side on the non-wet road. A method for evaluating hydroplaning resistance performance in which the test tire is evaluated for hydroplaning by running on a wet road. 2. The method for evaluating hydroplaning resistance according to claim 1, wherein the trailing vehicle is connected to a rear portion or a side portion of the self-propelled vehicle to perform traction. 3. A self-propelled vehicle connected to a non-wet road along with a wet road and connected to a following vehicle equipped with test tires, and the self-propelled vehicle is caused to run on the non-wet road. An apparatus for evaluating hydroplaning resistance, wherein a test tire of a running vehicle is configured to run on the wet road.